CN113175311B - Throttle device and method for replacing throttle core - Google Patents
Throttle device and method for replacing throttle core Download PDFInfo
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- CN113175311B CN113175311B CN202010269215.9A CN202010269215A CN113175311B CN 113175311 B CN113175311 B CN 113175311B CN 202010269215 A CN202010269215 A CN 202010269215A CN 113175311 B CN113175311 B CN 113175311B
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000004519 manufacturing process Methods 0.000 claims abstract description 23
- 238000007789 sealing Methods 0.000 claims description 6
- 239000007789 gas Substances 0.000 description 42
- 238000013461 design Methods 0.000 description 23
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 14
- 230000008569 process Effects 0.000 description 8
- 230000001276 controlling effect Effects 0.000 description 7
- 239000003345 natural gas Substances 0.000 description 7
- 238000004891 communication Methods 0.000 description 6
- 239000004576 sand Substances 0.000 description 6
- 241000191291 Abies alba Species 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 239000003570 air Substances 0.000 description 3
- 230000001174 ascending effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 2
- 210000004907 gland Anatomy 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 239000012080 ambient air Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002343 natural gas well Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
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- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
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Abstract
The disclosure relates to a throttling device and a method for replacing a throttling core, and belongs to the technical field of gas delivery. This is disclosed through the closure of control production valve, makes the interior gas pressure of working pipe and oil pipe rise, through with control valve pressure release, makes the gas pressure of throttle core top be less than the gas pressure of below to make this throttle core break away from the inside of working barrel, the inner space through the working pipe goes upward to the well head. The structure utilizes the self pressure of the gas well, realizes the automatic lifting and lowering of the throttling nozzle in the shaft through the regulation of the pressure of the well mouth, does not need to carry out the throwing and fishing operation under pressure, not only ensures the safety, but also has low labor intensity.
Description
Technical Field
The disclosure relates to the technical field of gas delivery, in particular to a throttling device and a method for replacing a throttling core.
Background
In the natural gas exploitation process, the pressure of the natural gas in the stratum is high, and the natural gas conveying pipeline and facility equipment built on the ground cannot bear too high pressure, so that the natural gas in a high-pressure state needs to be subjected to pressure reduction treatment. At present, the purposes of reducing pressure and regulating flow are achieved by installing a throttling device at a certain depth position in a natural gas well and utilizing throttling.
The existing underground throttling device mainly comprises a movable underground throttling device and a fixed underground throttling device, wherein the two types of underground throttling devices are different in the setting mode, the fixed throttling device is provided with a working barrel, the throttling devices are arranged in the working barrel through rope operation, and the movable throttling devices are directly clamped on an oil pipe.
When the throttle nozzle needs to be adjusted or replaced, the existing underground throttling device needs to implement the throwing and fishing operation of the throttle nozzle under the condition of pressure, and the throttle nozzle is adjusted or replaced on the ground after the throttle nozzle is fished to the ground, so that the safety cannot be guaranteed, and the labor intensity is high.
Disclosure of Invention
The embodiment of the disclosure provides a throttling device and a method for replacing a throttling core, which can solve the problems that the safety cannot be guaranteed and the labor intensity is high when a throttling nozzle is adjusted or replaced in the conventional underground throttling device. The technical scheme is as follows:
in one aspect, a flow restriction device is provided, the device comprising: the oil pipe, the fixed cylinder arranged at the bottom end of the oil pipe, the working pipe sleeved in the oil pipe and the working cylinder arranged at the lower part of the working pipe are arranged;
a through hole is formed in the working barrel, and a detachable throttling core is arranged in the through hole;
the top of the oil pipe is provided with a production valve for controlling the working pipe and the gas in the oil pipe to flow out;
the top of the working pipe is provided with a control valve for controlling the sealing of the inside of the working pipe.
In a possible design, the top of the throttling core protrudes out of the working cylinder, and the air outlet of the throttling core is communicated with the annular space between the working cylinder and the fixed cylinder.
In one possible design, the top of the throttling core is provided with a lifting wing;
the cross-sectional area of the take-off and landing wing is larger than that of the throttling core.
In one possible design, the top of the throttle core has a spherical head.
In one possible design, an annular clamping groove is arranged between the throttling core and the spherical head;
the top of the working pipe is provided with a clamping stop matched with the spherical head.
In one possible design, the throttling core is sleeved with an elastic element;
the elastic piece is used for abutting against the top of the working barrel.
In one possible design, an eccentric airflow passage is provided in the throttle body.
In one possible embodiment, the side wall of the mandrel is provided with a plurality of gas flow openings uniformly in the circumferential direction.
In one possible design, a packer is arranged on the inner wall of the fixed cylinder;
the mandrel is adapted to be inserted into the packer.
In one aspect, a method for replacing a throttle core is provided, and the method includes:
closing the production valve;
opening the control valve;
when the original throttling core in the working barrel rises to the top of the working pipe, taking out the original throttling core from the working pipe;
and placing a new throttling core in the working pipe, closing the control valve and enabling the new throttling core to descend into the working barrel.
Through the closure of control production valve, make the interior gas pressure of working tube and oil pipe rise, through with control valve pressure release, make the gas pressure of throttle core top be less than the gas pressure of below to make this throttle core break away from the inside of working barrel, go upward to the well head through the inner space of working tube. The structure utilizes the self pressure of the gas well, realizes the automatic lifting and lowering of the throttling nozzle in the shaft through the regulation of the pressure of the well mouth, does not need to carry out the throwing and fishing operation under pressure, not only ensures the safety, but also has low labor intensity.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a downhole throttling device provided by an embodiment of the disclosure;
fig. 2 is a schematic structural diagram of a throttle core 41 provided in the embodiment of the present disclosure;
fig. 3 is a flowchart of a method for replacing the throttle core 41 according to an embodiment of the present disclosure.
The various reference numbers in the drawings are illustrated below:
1-an oil pipe;
11-producing a valve;
12-oil pipe communicating valve;
2-fixing the cylinder;
21-a packer;
3-a working pipe;
31-a control valve;
32-working pipe communicating valve;
4-a working barrel;
41-a throttling core;
411-a take-off and landing wing;
412-spherical head;
413-ring card slot;
414-a resilient member;
42-a sand control cover;
5-testing the gate.
Detailed Description
To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a downhole throttling device provided in an embodiment of the present disclosure, and fig. 2 is a schematic structural diagram of a throttling core 41 provided in an embodiment of the present disclosure, please refer to fig. 1 and fig. 2, the device includes: the oil pipe comprises an oil pipe 1, a fixed cylinder 2 arranged at the bottom end of the oil pipe 1, a working pipe 3 sleeved in the oil pipe 1 and a working cylinder 4 arranged at the lower part of the working pipe 3; a through hole is arranged in the working barrel 4, and a detachable throttling core 41 is arranged in the through hole; the top of the oil pipe 1 is provided with a production valve 11 for controlling the outflow of the gas in the working pipe 3 and the oil pipe 1; the top of the working tube 3 is provided with a control valve 31 for controlling the sealing of the interior of the working tube 3.
The working principle of the downhole throttling device provided by the embodiment of the disclosure is detailed as follows:
in an oil-gas well, a fixed cylinder 2, namely a throttling cylinder, is connected with an oil pipe 1 at the upper part through an oil pipe joint, and the fixed cylinder 2 is positioned at a certain depth underground.
The inside of oil pipe 1 is equipped with working tube 3, and the bottom of working tube 3 is connected with working barrel 4, and working barrel 4 is located the inside of solid fixed cylinder 2, by this working barrel 4 of gland bearing of solid fixed cylinder 2 bottom. The top of the oil pipe 1 and the working pipe 3 is provided with a Christmas tree, and the structures of the production valve 11, the control valve 31 and the like are integrated on the Christmas tree.
The gland of the fixed cylinder 2 is provided with a vent hole, and the bottom of the working cylinder 4 is also provided with a vent hole. The annular space between the fixed cylinder 2, the working cylinder 4, the throttling core 41, the working cylinder 4 and the fixed cylinder 2 forms a gas exploitation channel.
Based on the above structure, the choke core 41 is thrown into the working pipe 3 through the test gate 5 on the christmas tree, which is located directly above the working pipe 3. After that, the pressure in the working pipe 3 and the oil pipe 1 is balanced by adjusting the control valve 31 of the working pipe 3 of the Christmas tree and the production valve 11 of the oil pipe 1, so that the throttling core 41 can descend in the working pipe 3 based on the self gravity and finally sit in the working barrel 4.
The choke core 41 is used for adjusting the flow rate, and by adjusting the pressure inside the oil pipe 1 and the working pipe 3, the choke core 41 can be detached from the working cylinder 4 when the choke core 41 needs to be adjusted or replaced.
By arranging the working pipe 3 in the oil pipe 1 and arranging the working barrel 4 in the working pipe 3, gas flowing out of the stratum can flow through the annular space between the working barrel 4 and the fixed barrel 2 through the working barrel 4 to be produced out of a well; the throttle core 41 is detachably arranged in the working barrel 4, when the throttle core 41 needs to be adjusted or replaced, the pressure above and below the throttle core 41 can be different by controlling the pressure inside the working pipe 3 above the throttle core 41, the pressure above the throttle core 41 is smaller, and therefore the throttle core 41 can be separated upwards from the inside of the working barrel 4 and upwards moves to a wellhead through the inner space of the working pipe 3.
The structure utilizes the self pressure of the gas well, realizes the automatic lifting and lowering of the throttling core 41 in the shaft through the regulation of the pressure of the well mouth, does not need to carry out the throwing and fishing operation under pressure, not only ensures the safety, but also has low labor intensity.
In the process that the throttling core 41 moves upwards, accumulated liquid in the working pipe 3 can be discharged along with the throttling core, and water collection and exhaust in the later period are facilitated.
The following details the structure and the working principle of each part of the device:
in a possible design, a working pipe communication valve 32 is further disposed at the top of the working pipe 3, and the working pipe communication valve 32 is used in cooperation with the control valve 31 to achieve sealing of the working pipe 3. Specifically, the working pipe communication valve 32 is connected in parallel with the control valve 31.
In a possible design, the top of the oil pipe 1 is further provided with an oil pipe communication valve 12, which is used for matching with the production valve 11 to realize the production of natural gas and the control of the production speed of natural gas. Specifically, the tubing communication valve 12 is in parallel with the production valve 11.
In a possible design, the top of the throttle core 41 protrudes from the working cylinder 4, and the air outlet of the throttle core 41 communicates with the annular space between the working cylinder 4 and the fixed cylinder 2.
Wherein, the gas outlet of the throttling core 41 is located on the side wall of the throttling core 41, which is convenient for the gas in the throttling core 41 to flow out.
In one possible design, the top of the throttle body 41 is provided with a lifting wing 411; the cross-sectional area of the landing wing 411 is larger than that of the throttle core 41.
The top of the choke core 41 is a column, and the lifting wing 411 is sleeved on the top of the choke core 41. The lifting wing 411 may include a plurality of wings arranged up and down, each wing may include a plurality of blades or be annular as a whole. The provision of the landing wing 411 increases the contact area with the ambient air. Specifically, the lifting wing 411 may include 2 to 4 wings, each of which includes 2 to 4 blades, which is not limited in this embodiment.
When the throttle core 41 moves up and down in the working pipe 3 under the combined action of its own weight and the pressure difference between the upper and lower sides of the throttle core 41, the lifting wing 411 plays a role of balancing, so that the moving path of the throttle core 41 is always along the axial direction of the working pipe 3, thereby avoiding the deviation.
In a possible design, the lifting wing 411 has a downward bend, which is beneficial to making the throttling core 41 smoother in the upward process when the lower gas pressure is greater than the upper gas pressure; meanwhile, when the lifting wing 411 contacts the working pipe 3 during the ascending process, the downward bending is beneficial to buffer the collision between the lifting wing 411 and the working pipe 3.
In one possible design, the landing wing 411 connects the bends by a smooth transition. The bend may be formed integrally with the lifting wing 411, or may be fixed to the lifting wing 411 by welding, bonding, or the like.
In one possible design, the top of the throttle body 41 has a spherical head 412.
The spherical head 412 is used for reducing the resistance borne by the upper end part of the throttling core 41 in the upward process of the throttling core 41, and when the throttling core 41 moves upward to a wellhead, the spherical head 412 can also buffer the impact of the throttling core 41 on the sealing structure at the top of the working pipe 3.
Specifically, the diameter of the spherical head 412, and the diameter of the lower end portion of the throttle core 41 for insertion into the barrel 4 are smaller than the diameter of the main body portion of the throttle core 41.
In a possible design, the spherical head 412 is arranged coaxially with the throttle core 41, further ensuring that the moving path of the throttle core 41 is always along the axial direction of the working tube 3, and avoiding deflection.
In one possible design, an annular clamping groove 413 is formed between the throttle body 41 and the spherical head 412; the top of the service pipe 3 is provided with a catch fitting with the spherical head 412.
Specifically, the spherical head 412 may be a full sphere or a hemisphere, which is not limited in this embodiment. The hemispherical shape facilitates connection with the ring groove 413.
The design is that: when the pressure difference enables the throttling core 41 to ascend to the wellhead, the clamping piece at the wellhead can clamp the throttling core 41, and the throttling core 41 can be taken out conveniently.
In particular, the stop may be elastic and deformable, for example made of rubber, provided with a circular hole in an intermediate position of the bottom, the inner diameter of which is smaller than the spherical head 412.
The spherical head 412 can press the circular hole under the action of pressure difference to make the circular hole generate elastic deformation, thereby realizing hanging on the clamping part so as to take out the throttling core 41 by opening the control valve 31.
In one possible design, the throttle body 41 is sleeved with an elastic member 414; the resilient member 414 is adapted to abut against the top of the mandrel 4.
The elastic member 414 is used for buffering the impact between the throttle core 41 and the top of the working barrel 4 to avoid damage when the throttle core 41 descends into the working barrel 4, and the throttle core 41 can be inserted into the working barrel 4 based on its own weight.
In particular, the elastic member 414 may be a spring.
In one possible design, an eccentric airflow passage is provided in the throttle body 41.
Specifically, a cylinder is disposed on a side wall of the inside of the throttling core 41, a blind hole is disposed at the top of the cylinder, a vent hole is further disposed at a position where the side wall of the blind hole is communicated with the side wall of the throttling core 41, and the blind hole and the vent hole form the eccentric airflow channel.
Further, a detachable tube body is arranged in the blind hole, the smallest air flow passage in the throttle core 41 is an inner cavity of the tube body, and the throttling capacity of the throttle core 41 depends on the size of the inner diameter of the tube body. The throttling capacity of the throttling core 41 can be changed by replacing the pipe bodies with different inner diameters, so that the working parameters of the gas well are adjusted, and the flexible production is facilitated.
The eccentric airflow channel is used for protecting the pipe body in the throttling core 41, so that high-pressure airflow is prevented from directly impacting the pipe body, and the service life of the pipe body is prolonged.
In one possible design, the side wall of the mandrel 4 is provided with a plurality of gas flow openings uniformly in the circumferential direction.
The plurality of gas flow openings may be arranged in one or more rows in the vertical direction, which is not limited in this embodiment.
The gas flowing out of the throttling core 41 flows into the annular space between the working barrel 4 and the fixed barrel 2 through the plurality of gas circulation ports, and the inner cavity of the pipe body in the throttling core 41 is ensured to be the position with the smallest diameter in the whole gas circulation channel, so that the throttling effect of the throttling core 41 is ensured to be effective, and the smooth operation of the gas exploitation process is also ensured.
Because the working pipe 3 is communicated with the working barrel 4, the oil pipe 1 is communicated with the fixed pipe, and the gas subsequently flows into the annular space between the working pipe 3 and the oil pipe 1 from the annular space between the working barrel 4 and the fixed barrel 2, and is then mined out of the well.
In one possible design, the bottom of the mandrel 4 is provided with a sand control shroud 42; the sand control mask 42 is provided with a plurality of sand control holes.
The sand control cover 42 is barrel-shaped, and smooth transition is formed between the bottom wall and the side wall, so that gas is filtered in the gas ascending process, and impurities such as sand and stones are reduced to ascend along with the gas to block an airflow channel.
In one possible design, the inner wall of the fixed cylinder 2 is provided with a packer 21; the mandrel 4 is used to insert into the packer 21.
Specifically, the packer 21 is used to form a seal between the mandrel 4 and the fixed barrel 2, ensuring that gas flowing from the choke core 41 into the annular space between the mandrel 4 and the fixed barrel 2 does not leak downward.
The installation process of the mandrel 4 includes: the working barrel 4 moves from top to bottom to the packer 21, and the packer 21 is opened based on the self gravity of the working barrel 4 to realize sealing.
Specifically, the packer 21 comprises a balloon which deforms and expands laterally after being subjected to pressure, the outer wall of which abuts against the fixed barrel 2 and the inner wall of which abuts against the mandrel 4.
In one possible design, the service pipe 3 has a smooth inner wall.
Wherein the smooth inner wall is used for reducing the resistance of the throttling core 41 during the movement in the working pipe 3.
The pressure on the upper part of the working pipe 3 is relieved by opening the control valve 31, so that the throttling core 41 moves upwards; by closing the control valve 31, normal gas production is ensured.
All the above optional technical solutions may be combined arbitrarily to form the optional embodiments of the present disclosure, and are not described herein again.
According to the device provided by the embodiment of the disclosure, the working pipe 3 is arranged in the oil pipe 1, the working barrel 4 is arranged in the working pipe 3, and gas flowing out of a formation can flow through the annular space between the working barrel 4 and the fixed barrel 2 through the working barrel 4 and be produced out of a well; the throttle core 41 is detachably arranged in the working barrel 4, when the throttle core 41 needs to be adjusted or replaced, the pressure above and below the throttle core 41 can be different by controlling the pressure inside the working pipe 3 above the throttle core 41, the upper pressure is lower, and therefore the throttle core 41 can be separated upwards from the inside of the working barrel 4 and upwards move to a wellhead through the inner space of the working pipe 3.
The structure utilizes the self pressure of the gas well, realizes the automatic lifting and lowering of the throttling core 41 in the shaft through the regulation of the pressure of the well mouth, does not need to carry out the throwing and fishing operation under pressure, not only ensures the safety, but also has low labor intensity.
Further, the top of the choke core 41 is provided with a lifting wing 411, so that the contact area with the surrounding gas is increased. When the throttle core 41 moves up and down in the working pipe 3 under the combined action of its own weight and the pressure difference between the upper and lower sides of the throttle core 41, the lifting wing 411 plays a role of balancing, so that the moving path of the throttle core 41 is always along the axial direction of the working pipe 3, thereby avoiding the deviation.
Based on the device, the oil and gas well can carry out normal production operation, in the production process, natural gas extracted from the bottom layer is extracted out of the well through the vent hole at the bottom of the fixed cylinder 2, the vent hole at the bottom of the working cylinder 4, the throttling core 41 and the annular space between the working cylinder 4 and the fixed cylinder 2, and when the throttling core 41 needs to be replaced, the operation can be carried out by adopting the following method.
Fig. 3 is a flowchart of a method for replacing the throttle core 41 according to an embodiment of the present disclosure, where the method includes:
301. the production valve 11 is closed.
In this step, after the production valve 11 is closed, the gas production hole is closed, and the gas generated in the formation continuously flows to the annular space between the working pipe 3 and the oil pipe 1, so that the pressure in the annular space rises, and the pressure in the space between the bottom of the throttling core 41 communicated with the annular space and the working barrel 4 also rises, thereby accumulating pressure for the subsequent dismounting process of the throttling core 41.
302. The control valve 31 is opened.
In this step, after the control valve 31 is closed, the pressure of the gas above the choke core 41 becomes lower, and the choke core 41 moves upward due to the difference between the upper and lower pressures and its own weight, based on the increase in the pressure of the gas below the choke core 41 in the above step 301.
Specifically, step 302 may be performed after a preset time period after step 301 to ensure that the gas pressure in the annular space is sufficiently elevated. The preset time period may be set according to an actual situation, for example, 1 to 10 minutes, which is not limited in this embodiment. It is also possible to close the control valve 31 at the same time as the production valve 11 is closed.
303. When the original throttle core in the working barrel 4 rises to the top of the working pipe 3, the original throttle core is taken out from the working pipe 3.
In this step, the removable pipe body inside the original throttle body may be replaced based on the taken out throttle body 41 to change the throttle capability of the throttle body 41, or the throttle body 41 may be replaced to form the original throttle body.
304. The original throttle core is placed in the working pipe 3, the control valve 31 is closed, and the original throttle core descends to the working barrel 4.
In this step, the gas pressure inside the working tube 3 can be controlled by closing the control valve 31.
Specifically, the choke core 41 may fall under its own weight while the gas pressure area in the communication area is in an equilibrium state in the working pipe 3, above the choke core 41, below the choke core 41, between the working pipe 3 and the oil pipe 1 after closing for a while, or the choke core 41 may fall under its own weight after the production valve 11 is opened and production is resumed, which is not limited in this embodiment.
Specifically, the throttle body 41 may be dropped into the working barrel 4, and the elastic member 414 on the throttle body 41 abuts against the top of the working barrel 4 and plays a role of buffering during collision.
All the above optional technical solutions may be combined arbitrarily to form optional embodiments of the present disclosure, and are not described in detail herein.
According to the method provided by the embodiment of the disclosure, the working pipe 3 is arranged in the oil pipe 1, the working barrel 4 is arranged in the working pipe 3, and gas flowing out of the stratum can flow through the annular space between the working barrel 4 and the fixed barrel 2 through the working barrel 4 and be produced out of a well; the throttle core 41 is detachably arranged in the working barrel 4, when the throttle core 41 needs to be adjusted or replaced, the pressure above and below the throttle core 41 can be different by controlling the pressure inside the working pipe 3 above the throttle core 41, the pressure above the throttle core 41 is smaller, and therefore the throttle core 41 can be separated upwards from the inside of the working barrel 4 and upwards moves to a wellhead through the inner space of the working pipe 3.
The structure utilizes the self pressure of the gas well, realizes the automatic lifting and lowering of the throttling core 41 in the shaft through the regulation of the pressure of the well mouth, does not need to carry out the throwing and fishing operation under pressure, not only ensures the safety, but also has low labor intensity.
The above description is only exemplary of the present disclosure and is not intended to limit the present disclosure, so that any modification, equivalent replacement, or improvement made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure.
Claims (7)
1. A flow restriction device, characterized in that the device comprises: the oil pipe comprises an oil pipe (1), a fixed cylinder (2) arranged at the bottom end of the oil pipe (1), a working pipe (3) sleeved in the oil pipe (1) and a working cylinder (4) arranged at the lower part of the working pipe (3);
a through hole is formed in the working barrel (4), and a detachable throttling core (41) is arranged in the through hole;
the top of the throttling core (41) is sleeved with a lifting wing (411), the cross-sectional area of the lifting wing (411) is larger than that of the throttling core (41), the lifting wing (411) comprises a plurality of wings which are arranged up and down, each wing comprises a plurality of fan blades or is annular as a whole, and the lifting wing (411) is bent downwards;
the top of the throttling core (41) is provided with a spherical head (412), an annular clamping groove (413) is formed between the throttling core (41) and the spherical head (412), the top of the working pipe (3) is provided with a clamping part matched with the spherical head (412), and the clamping part is used for clamping the throttling core (41) when the throttling core (41) ascends to a well mouth;
the top of the oil pipe (1) is provided with a production valve (11) for controlling the outflow of gas in the working pipe (3) and the oil pipe (1);
and a control valve (31) is arranged at the top of the working pipe (3) and used for controlling the sealing of the inside of the working pipe (3).
2. The device according to claim 1, characterized in that the top of the throttling core (41) protrudes from the working cylinder (4), and the air outlet of the throttling core (41) is communicated with the annular space between the working cylinder (4) and the fixed cylinder (2).
3. The device according to claim 1, characterized in that the throttle core (41) is sleeved with an elastic member (414);
the elastic piece (414) is used for abutting against the top of the working barrel (4).
4. The device according to claim 1, characterized in that an eccentric air flow channel is arranged in the throttle core (41).
5. Device according to claim 1, characterized in that the side wall of the mandrel (4) is provided with a plurality of gas flow openings uniformly along the circumferential direction.
6. The device according to claim 1, characterized in that a packer (21) is arranged on the inner wall of the fixed cylinder (2);
the working barrel (4) is used for being inserted into the packer (21).
7. A method for replacing a throttle core, wherein the method is implemented by a throttle device according to any one of claims 1 to 6, and the method comprises:
closing the production valve (11);
opening the control valve (31);
after the original throttling core in the working barrel (4) rises to the top of the working pipe (3), taking out the original throttling core from the working pipe (3);
and placing the original throttling core into the working pipe (3), closing the control valve (31) and enabling the original throttling core to descend into the working barrel (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010269215.9A CN113175311B (en) | 2020-04-08 | 2020-04-08 | Throttle device and method for replacing throttle core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010269215.9A CN113175311B (en) | 2020-04-08 | 2020-04-08 | Throttle device and method for replacing throttle core |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113175311A CN113175311A (en) | 2021-07-27 |
| CN113175311B true CN113175311B (en) | 2022-08-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010269215.9A Active CN113175311B (en) | 2020-04-08 | 2020-04-08 | Throttle device and method for replacing throttle core |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5488993A (en) * | 1994-08-19 | 1996-02-06 | Hershberger; Michael D. | Artificial lift system |
| US6371084B1 (en) * | 1998-06-18 | 2002-04-16 | Robert Bosch Gmbh | Fuel injection valve for high-pressure injection with improved control of fuel delivery |
| CN201620796U (en) * | 2010-02-25 | 2010-11-03 | 中国石油天然气股份有限公司 | Fishing tool for downhole choke |
| CN202745781U (en) * | 2012-07-04 | 2013-02-20 | 中国石油天然气股份有限公司 | Fishing tool for natural gas exploitation underground throttler |
| CN107143296A (en) * | 2017-05-09 | 2017-09-08 | 中国石油化工股份有限公司华北油气分公司石油工程技术研究院 | A kind of horizontal gas well negative pressure drags for sand method, horizontal gas well negative pressure and drags for sand system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10055267B4 (en) * | 2000-11-08 | 2004-07-29 | Robert Bosch Gmbh | Pressure-controlled injector for high injection with slide throttles |
-
2020
- 2020-04-08 CN CN202010269215.9A patent/CN113175311B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5488993A (en) * | 1994-08-19 | 1996-02-06 | Hershberger; Michael D. | Artificial lift system |
| US6371084B1 (en) * | 1998-06-18 | 2002-04-16 | Robert Bosch Gmbh | Fuel injection valve for high-pressure injection with improved control of fuel delivery |
| CN201620796U (en) * | 2010-02-25 | 2010-11-03 | 中国石油天然气股份有限公司 | Fishing tool for downhole choke |
| CN202745781U (en) * | 2012-07-04 | 2013-02-20 | 中国石油天然气股份有限公司 | Fishing tool for natural gas exploitation underground throttler |
| CN107143296A (en) * | 2017-05-09 | 2017-09-08 | 中国石油化工股份有限公司华北油气分公司石油工程技术研究院 | A kind of horizontal gas well negative pressure drags for sand method, horizontal gas well negative pressure and drags for sand system |
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| Publication number | Publication date |
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| CN113175311A (en) | 2021-07-27 |
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