CN111502613B - Pressure reducing device and pressure reducing method for gas lift wellhead of differential pressure type compressor - Google Patents
Pressure reducing device and pressure reducing method for gas lift wellhead of differential pressure type compressor Download PDFInfo
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- CN111502613B CN111502613B CN202010402473.XA CN202010402473A CN111502613B CN 111502613 B CN111502613 B CN 111502613B CN 202010402473 A CN202010402473 A CN 202010402473A CN 111502613 B CN111502613 B CN 111502613B
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000007788 liquid Substances 0.000 claims abstract description 107
- 238000000926 separation method Methods 0.000 claims abstract description 50
- 238000001514 detection method Methods 0.000 claims abstract description 10
- 238000007599 discharging Methods 0.000 claims abstract description 9
- 238000004519 manufacturing process Methods 0.000 claims abstract description 7
- 230000006837 decompression Effects 0.000 claims description 20
- 239000012530 fluid Substances 0.000 claims description 13
- 210000002445 nipple Anatomy 0.000 claims description 6
- 238000005260 corrosion Methods 0.000 claims 1
- 239000007789 gas Substances 0.000 description 94
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 18
- 230000008569 process Effects 0.000 description 11
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 10
- 229910052757 nitrogen Inorganic materials 0.000 description 9
- 230000000694 effects Effects 0.000 description 7
- 239000003345 natural gas Substances 0.000 description 5
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 206010017740 Gas poisoning Diseases 0.000 description 1
- 241000521257 Hydrops Species 0.000 description 1
- 206010030113 Oedema Diseases 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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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
- E21B43/121—Lifting well fluids
- E21B43/122—Gas lift
-
- 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
- E21B43/34—Arrangements for separating materials produced by the well
- E21B43/38—Arrangements for separating materials produced by the well in the well
-
- 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
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
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- Mining & Mineral Resources (AREA)
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- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
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- Structures Of Non-Positive Displacement Pumps (AREA)
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Abstract
The invention discloses a pressure reducing device and a pressure reducing method for a gas lift wellhead of a differential pressure type compressor, and belongs to the technical field of drainage and gas production matching devices. The pressure reducing channel of the pressure reducing separation chamber of the wellhead pressure reducing device is communicated with the air inlet pipe, and the gas-liquid separation channel is communicated with the air outlet pipe; each group of flow guiding units is used for communicating the pressure reducing channel with the gas-liquid separation channel and for gradually reducing pressure along the direction from the air inlet pipe to the air outlet pipe; each group of flow guiding units at least comprises two flow guiding channels; the slide valve structure is arranged in the pressure reducing channel and used for pressure relief of the diversion channels of each group of diversion units; a liquid discharge channel provided with a liquid discharge valve and arranged at the bottom of the gas-liquid separation channel for discharging separated liquid; the air inlet pipe and the air outlet pipe are respectively provided with a pressure detection part. The invention also discloses a method for decompressing the gas lifting wellhead of the compressor by using the decompressing device.
Description
Technical Field
The invention relates to the technical field of drainage and gas production matching devices, in particular to a pressure reducing device and a pressure reducing method for a gas lift wellhead of a differential pressure type compressor.
Background
Compressor (nitrogen) gas lift requires venting of the miscible gas-liquid from the bottom of the well to the top of the well downstream of the well top. The discharging effect depends on the pressure at the wellhead downstream, and during discharging, the control of the wellhead discharging instant pressure is realized by adjusting a throttle valve at the wellhead downstream of the gas well.
According to the national environmental protection requirements, the current compressor (nitrogen) gas lift mostly adopts a downstream liquid discharge closed gathering and transportation process, the effect of the process depends on the pressure of a gathering gas main pipe, when the pressure of the gathering gas main pipe exceeds 5MPa, mixed phase gas liquid lifted from a bottom hole to a wellhead can form an overpressure phenomenon at a downstream throttle valve, so that the downstream throttle valve is damaged and even a pipeline is broken.
In the process of compressor (nitrogen) gas lift operation, the pressure of a downstream gas collecting main pipe is controlled by manually adjusting a throttle valve, and the mode has two problems:
1. if the pressure of the front end of the downstream throttle valve rises by 2MPa within 1 second, a step-down measure is forced to be adopted. Generally, the operation rule of the compressor (gas lift) requires the wellhead operator to pay attention to observe the wellhead pressure at any time, but sometimes the pressure change speed is high, the quick response is often difficult, effective measures cannot be timely adopted to adjust or close the throttle valve, if the operation is performed by overpressure for a certain period of time, the valve body and the downstream gas collecting main pipe are exposed to damage danger, and the wellhead operator has operation safety risk;
2. When the downstream pressure exceeds 5MPa, wellhead operators timely adjust a throttle valve, the liquid discharge speed in a gas collecting dry pipe is reduced, part of mixed phase gas and liquid lifted to the wellhead can flow back to the bottom of a well, the gas lifting liquid discharge effect of a compressor (nitrogen) is difficult to ensure, the single measure effect cannot meet the design requirement, and the measure operation cost is increased.
At present, in order to achieve the safety and effect of the gas lift drainage measure of the compressor (nitrogen), a 50m 3 normal-pressure closed liquid collecting tank is generally connected to the downstream of a wellhead adjusting valve. Therefore, operators are not required to observe wellhead pressure at any time, and liquid discharge can be performed according to the displacement designed by measures. But needs to adjust the measure process scheme, and a 50m 3 normal-pressure closed liquid collecting tank is assembled on the operation site. Thus, not only the operation cost is increased, but also the waste liquid of the in-tank measures cannot be effectively treated in a short period after the measures are completed. The process has obvious defects and is difficult to apply on a large scale.
Aiming at the existing problems, the gas lift operation of the compressor (nitrogen) is implemented by more depending on the experience of wellhead operators without adding any equipment and process, and the skill proficiency requirement of the switch regulating valve on the wellhead operators is extremely high when the pressure is higher than 10MPa, so that the operation effect is difficult to be ensured to the greatest extent under the existing measure conditions, and the gas lift operation of the natural gas (nitrogen) is not beneficial to the institutionalization and standardization.
The gas source connected with the gas lift of the compressor is a gas-liquid mixed phase flowing at high speed in a gas collecting dry pipe at the downstream of the gas well, and after the gas-liquid mixed phase is treated by a simple separation device of the compressor, the separated natural gas is injected into an oil jacket annulus of the gas well after being pressurized, so that external energy is provided for lifting a liquid column in an oil pipe out of the ground. When the liquid column is lifted to the ground, the discharge medium is in a gas-liquid mixed phase, and flows into a gas collecting dry pipe at the downstream of the gas well through a downstream throttle valve. Along with the gas-liquid mixed phase being discharged out of the shaft, gas well gas production rate is increased, at the moment, a large amount of gas-liquid mixed phase flowing at high speed in the main pipe enters the simple separation device of the compressor, and when the gas-liquid mixed phase instantaneous flow collected from the gas collecting main pipe exceeds 15m 3/h and the gas-liquid ratio reaches 0.07m 3/m3, the separation device cannot work normally, so that the compressor is overloaded and stopped, the liquid discharge lifting efficiency is greatly influenced, and at present, the problem of the gas lifting of the compressor in the lifting process can be solved by no better process.
Although nitrogen can be used as an external air source to provide lifting energy for the hydrops production well, the nitrogen compressor has high gas lifting cost and limited effect. Therefore, there is an urgent need to develop a device that can control the gas-liquid mixed phase state of the well bore and match the corresponding process technology.
Disclosure of Invention
The invention aims to overcome the problems in the prior art and provides a pressure reducing device and a pressure reducing method for a gas lift wellhead of a differential pressure type compressor.
The invention provides a pressure reducing device for a gas lift wellhead of a differential pressure type compressor, which comprises
An air inlet pipe;
an air outlet pipe;
the decompression separation chamber comprises a gas-liquid separation channel and a decompression channel, the decompression channel is communicated with the air inlet pipe, and the gas-liquid separation channel is communicated with the air outlet pipe;
At least two groups of flow guiding units, each group of flow guiding units is used for communicating the pressure reducing channel with the gas-liquid separation channel and for gradually reducing pressure along the direction from the air inlet pipe to the air outlet pipe; each group of flow guiding units at least comprises two flow guiding channels, and each flow guiding channel is positioned on the same cross section of the decompression chamber;
the slide valve structure is arranged in the pressure reducing channel and is used for pressure relief of the diversion channels of each group of diversion units;
a liquid discharge channel provided with a liquid discharge valve and arranged at the bottom of the gas-liquid separation channel for discharging separated liquid;
the pressure detection parts are two in number, and one air inlet pipe and one air outlet pipe are respectively arranged on the two pressure detection parts.
Preferably, the spool valve structure comprises
The spring is arranged in the pressure reducing channel, and the free end of the spring is arranged at one side close to the air inlet pipe;
and the piston head is arranged at the free end of the spring.
Preferably, the side of the piston head adjacent to the air inlet pipe is of a conical structure.
Preferably, the pressure reducing separation chamber includes a spindle-type housing, the gas-liquid separation passage is provided along an inner wall of the spindle-type housing, and the pressure reducing passage is provided along a central axis direction of the spindle-type housing.
Preferably, each flow guiding unit is provided with three flow guiding channels which are uniformly distributed on the same cross section at 120 degrees.
Preferably, the ratio of the inner diameter of the pressure reducing channel to the inner diameter of the inlet pipe is 6:1.
Preferably, the air inlet pipe, the air outlet pipe and the decompression separation chamber are integrally formed or the air inlet pipe, the air outlet pipe and the decompression separation chamber are formed by separate parts, which are screwed together by a threaded connection part.
The air inlet pipe and the air outlet pipe are connected with an external pipeline through flanges.
The second purpose of the invention is to provide a method for decompressing the pressure-difference type compressor gas lift wellhead, which comprises the following steps;
The pressure difference type compressor gas lifting wellhead pressure reducing device is arranged between the front end and the rear end of a gas wellhead ground pipeline nipple, the nipple is replaced, and an interface is connected by adopting a flange and is connected with a gas source; the bearing grade of the device is designed according to the pressure of more than 20 MPa;
when the compressor gas lift starts to work, the high-pressure and high-speed gas-liquid mixed phase lifted to the ground is changed into low-pressure and low-speed separation gas and liquid after passing through a pressure difference type compressor gas lift wellhead pressure reducing device, most of the gas drives the liquid to continuously enter the downstream of a gas collecting pipeline through a gas outlet pipe, and whether the pressure of the gas-liquid mixed phase fluid lifted to the ground is within the safe operation range of the ground pipeline is judged by pressure detection pieces arranged on the gas inlet pipe and the gas outlet pipe;
After the gas lift of the compressor is finished, the normal production flow of the gas well is restored, the device is disassembled after pressure relief, a liquid discharge valve is opened to discharge the liquid remained in the device, and the device is well preserved and properly accommodated.
Compared with the prior art, the invention has the beneficial effects that: the pressure-reducing device of the pressure-difference type compressor gas lift wellhead adopts a flange connection mode, an inlet flange surface is connected with the flange surface at the upper end of a ground gas collecting pipeline, an outlet flange surface is connected with the flange surface at the rear end of the ground gas collecting pipeline, an air source interface is connected with an air inlet of the compressor, and the pressure-bearing grade of the device is designed according to the pressure of 20MPa or can be higher according to the gas collecting modes of different gas fields. The device mainly adopts spindle streamline structural design to carry out partial pressure selective separation on high-pressure and high-speed gas-liquid mixed phase fluid discharged to the ground by the gas lift of the compressor. On one hand, the mixed phase fluid with different grade pressures can be selectively guided into the separation bins with different volumes for separation, and on the other hand, gas with lower relative liquid content after separation treatment is provided for the gas source gas taking of the compressor.
1) More efficient drainage. The natural gas in the gas collecting pipeline is adopted by the gas lift of the existing compressor, when liquid is brought out of the wellhead and enters the gas collecting pipeline, a large amount of liquid enters the separator along with the gas inlet of the compressor, the rated working pressure of the gas source separator of the compressor is 2MPa, the liquid with large treatment capacity is 1m 3, when the liquid entering the separator exceeds the rated pressure or the maximum treatment capacity, the gas inlet safety valve of the compressor is opened, the compressor is started to stop the protection mode, the gas lift operation is interrupted, the liquid just lifted to the ground falls back to the bottom of the well under the support of no continuous gas source, and the compressor can only be started to operate again after the liquid in the gas source separator of the compressor is discharged.
After the device is used, most of the gas-liquid mixed phase fluid enters the device in advance to separate the fluid before entering the compressor air source separator, so that the work load of the compressor air source separator is reduced, the continuous working time of the compressor is ensured, and the liquid discharge efficiency is improved.
2) Preventing the well mouth and surface pipeline from being overpressurized. If the flow rate of the gas-liquid miscible fluid brought out of the ground is too high, and the pressure on the ground pipeline is too high (for example, the rated pressure of the pipeline is higher than 6.4 MPa), unsafe problems such as pipeline rupture, mechanical damage, gas poisoning and the like exist. After the device is processed by the device, the maximum cross section of the device is phi 65mm (which is larger than the phi 65mm of a ground pipeline), the high-pressure and high-speed gas-liquid mixed phase fluid is changed into a low-pressure and low-speed gas-liquid separation state, and when the gas-liquid mixed phase fluid enters a gas collecting pipeline at the rear end of the device, the gas-liquid separation state which is changed into the low-pressure state is changed, so that the safe operation of the gas lift of the compressor can be ensured to the greatest extent. The device has the characteristics of simple structure, convenient operation and the like, and the development and the field use of the product greatly reduce the workload of field staff, improve the safety level, strengthen the field management of the gas field and solve the problem of gas lift operation of the compressor.
3) The airtight pressure bearing does not need to drain liquid in the measure process. Because the device is connected with the ground flow of the gas well as a whole, the closed gathering and transportation can be ensured only by the characteristics of the conical structure and the variable diameter of the section of the device, liquid discharge in the measure process is not needed, the continuity of the gas lifting measure of the compressor is ensured, and the closed gathering and transportation can not pollute the environment.
Drawings
FIG. 1 is a schematic diagram of a pressure reducing device in a first-stage pressure reducing state according to the present invention;
FIG. 2 is a schematic diagram of a pressure reducing device in a two-stage pressure reducing state according to the present invention;
FIG. 3 is a schematic diagram of a three-stage pressure reducing device according to the present invention;
fig. 4 is a schematic view showing the internal structure of the pressure reducing device of the present invention.
Reference numerals illustrate:
1. an air inlet pipe; 2. a pressure gauge joint 1; 3. a gas-liquid separation channel; 4. a pressure gauge joint 2; 5. a conical piston head; 6. a primary flow guide channel; 7. a secondary diversion channel; 8. a liquid discharge channel; 10. three-stage diversion channels; 11. a spring; 12. and an air outlet pipe.
Detailed Description
Specific embodiments of the present invention will be described in detail below with reference to fig. 1-4, but it should be understood that the scope of the invention is not limited by the specific embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides a pressure reducing device for a gas lift wellhead of a differential pressure type compressor, which comprises the following components:
An air inlet pipe;
an air outlet pipe;
the decompression separation chamber comprises a gas-liquid separation channel and a decompression channel, the decompression channel is communicated with the air inlet pipe, and the gas-liquid separation channel is communicated with the air outlet pipe;
At least two groups of flow guiding units, each group of flow guiding units is used for communicating the pressure reducing channel with the gas-liquid separation channel and for gradually reducing pressure along the direction from the air inlet pipe to the air outlet pipe; each group of flow guiding units at least comprises two flow guiding channels, and each flow guiding channel is positioned on the same cross section of the decompression chamber;
the slide valve structure is arranged in the pressure reducing channel and is used for pressure relief of the diversion channels of each group of diversion units;
a liquid discharge channel provided with a liquid discharge valve and arranged at the bottom of the gas-liquid separation channel for discharging separated liquid;
the pressure detection parts are two in number, and one air inlet pipe and one air outlet pipe are respectively arranged on the two pressure detection parts.
Wherein the slide valve structure comprises
The spring is arranged in the pressure reducing channel, and the free end of the spring is arranged at one side close to the air inlet pipe;
and the piston head is arranged at the free end of the spring.
Wherein, one side of the piston head close to the air inlet pipe is of a conical structure.
The decompression separation chamber comprises a spindle-shaped shell, wherein the gas-liquid separation channel is arranged along the inner wall of the spindle-shaped shell, and the decompression channel is arranged along the central axis direction of the spindle-shaped shell.
Wherein, each guide unit is equipped with three guide channel, and three guide channel is 120 evenly distributed on same cross section.
Wherein, the ratio of the inner diameter of the decompression channel to the inner diameter of the air inlet pipe is 6:1.
The air inlet pipe, the air outlet pipe and the decompression separation chamber are integrally formed or are formed by independent components, and are connected together through screw threads through a connecting part with screw threads.
Wherein, intake pipe and outlet duct pass through the flange and are connected with outside pipeline.
The embodiment also provides a method for decompressing the pressure-difference type compressor gas lift wellhead by using the pressure-difference type compressor gas lift wellhead decompressing device, which comprises the following steps of;
The pressure difference type compressor gas lifting wellhead pressure reducing device is arranged between the front end and the rear end of a gas wellhead ground pipeline nipple, the nipple is replaced, and an interface is connected by adopting a flange and is connected with a gas source; the bearing grade of the device is designed according to the pressure of more than 20 MPa; the air source interface is connected with the interface of the pressure detection piece at the air outlet pipe, and the pressure gauge can be connected with the interface when the pressure needs to be detected;
When the compressor gas lift starts to work, the high-pressure and high-speed gas-liquid mixed phase lifted to the ground is changed into low-pressure and low-speed separation gas and liquid after passing through a pressure difference type compressor gas lift wellhead pressure reducing device, most of the gas drives the liquid to continuously enter the downstream of a gas collecting pipeline through a gas outlet, and whether the pressure of the gas-liquid mixed phase fluid lifted to the ground is within the safe operation range of the ground pipeline is judged by a pressure detecting piece arranged on a gas inlet pipe and a gas outlet pipe of the device;
after the gas lift of the compressor is finished, the normal production flow of the gas well is restored, the pressure relief device of the gas lift wellhead of the differential pressure type compressor is disassembled after pressure relief, and a liquid discharge valve is opened to discharge the liquid remained in the pressure relief device, so that the device is well preserved and properly accommodated.
The gas-liquid separation channel 3 in the above embodiment. Mainly separating the natural gas mixed with liquid after being decompressed by the first, second and third diversion channels, and discharging the separated natural gas into a ground pipeline flow path through an air outlet pipe 12; the separated liquid is collected at the concave cavity of the spinning cone structure and is discharged through the liquid discharge channel 8;
a primary diversion channel 6. The cross section of the device is provided with 3 first-stage diversion channels which are 120 degrees, when the pressure of fluid flowing into the air inlet pipe 1 is less than 4MPa, the gas-liquid mixed phase pushes the conical piston head 5 and the compression spring 11 moves towards the air outlet pipe 12, the gas-liquid mixed phase enters the 3 first-stage diversion channels and then is decompressed and separated in the gas-liquid separation channel 3, then the gas enters the ground pipeline behind the gas outlet pipe 12, and the liquid slides to the bottom of the gas-liquid separation channel 3 to be collected and discharged;
And a secondary diversion channel 7. The cross section of the device is provided with 3 secondary diversion channels which are 120 degrees, when the pressure of fluid flowing into the air inlet pipe 1 is within the range of 4MPa-8MPa, the gas-liquid miscible phase pushes the conical piston head 5 and the compression spring 11 moves towards the air outlet pipe 12, the gas-liquid miscible phase enters the 3 primary diversion channels and the 3 secondary diversion channels at the moment and then is decompressed and separated in the gas-liquid separation channel 3, then the gas enters the ground pipeline behind the gas outlet pipe 12, and the liquid slides to the bottom of the gas-liquid separation channel 3 to be collected and discharged;
Three stages of diversion channels 10. The cross section of the device is provided with 3 three-stage diversion channels which are 120 degrees respectively, when the fluid pressure flowing into the air inlet pipe 1 is more than 8MPa, the gas-liquid miscible phase pushes the conical piston head 5 and the compression spring 11 moves towards the air outlet pipe 12, at the moment, the gas-liquid miscible phase enters the 3 first-stage diversion channels, the 3 second-stage diversion channels and the 3 three-stage diversion channels and then is decompressed and separated in the gas-liquid separation channel 3, then the gas enters the ground pipeline behind the gas outlet pipe 12, and the liquid slides to the bottom of the gas-liquid separation channel 3 to be collected and discharged.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A differential pressure compressor gas lift wellhead pressure relief device, comprising:
An air inlet pipe;
an air outlet pipe;
the decompression separation chamber comprises a gas-liquid separation channel and a decompression channel, the decompression channel is communicated with the air inlet pipe, and the gas-liquid separation channel is communicated with the air outlet pipe;
At least two groups of flow guiding units, each group of flow guiding units is used for communicating the pressure reducing channel with the gas-liquid separation channel and for gradually reducing pressure along the direction from the air inlet pipe to the air outlet pipe; each group of flow guiding units at least comprises two flow guiding channels, and each flow guiding channel is positioned on the same cross section of the decompression separation chamber;
the slide valve structure is arranged in the pressure reducing channel and is used for pressure relief of the diversion channels of each group of diversion units; the slide valve structure comprises
The spring is arranged in the pressure reducing channel, and the free end of the spring is arranged at one side close to the air inlet pipe;
The piston head is arranged at the free end of the spring;
a liquid discharge channel provided with a liquid discharge valve and arranged at the bottom of the gas-liquid separation channel for discharging separated liquid;
The number of the pressure detection pieces is two, and one air inlet pipe and one air outlet pipe are respectively arranged on the two pressure detection pieces;
The decompression separation chamber comprises a spindle-type shell, the gas-liquid separation channel is arranged along the inner wall of the spindle-type shell, and the decompression channel is arranged along the central axis direction of the spindle-type shell.
2. The pressure differential compressor gas lift wellhead pressure reducing device of claim 1 wherein a side of the piston head adjacent the inlet tube is tapered.
3. The pressure differential compressor gas lift wellhead pressure reducing device of claim 1 wherein each flow guide unit has three flow guide channels uniformly distributed on the same cross section at 120 °.
4. The pressure differential compressor gas lift wellhead pressure relief device as claimed in claim 1 wherein the ratio of the inner diameter of the relief passage to the inner diameter of the intake pipe is 6:1.
5. The pressure differential compressor gas lift wellhead pressure relief device as claimed in claim 1 wherein the inlet conduit, outlet conduit and pressure relief separation chamber are integrally formed or formed from separate pieces that are threadably connected together by threaded connections.
6. The pressure differential compressor gas lift wellhead pressure reducing device of claim 1 wherein the inlet and outlet pipes are connected to an external conduit by flanges.
7. A method for a differential pressure compressor gas lift wellhead pressure relief device as claimed in any one of claims 1-6, comprising the steps of;
The pressure difference type compressor gas lifting wellhead pressure reducing device is arranged between the front end and the rear end of a gas wellhead ground pipeline nipple, the nipple is replaced, and an interface is connected by adopting a flange and is connected with a gas source; the pressure-bearing grade of the pressure-difference type compressor gas lift wellhead pressure-reducing device is designed according to the pressure of more than 20 MPa;
when the compressor gas lift starts to work, the high-pressure and high-speed gas-liquid mixed phase lifted to the ground is changed into low-pressure and low-speed separation gas and liquid after passing through a pressure difference type compressor gas lift wellhead pressure reducing device, most of the gas drives the liquid to continuously enter the downstream of a gas collecting pipeline through a gas outlet pipe, and whether the pressure of the gas-liquid mixed phase fluid lifted to the ground is within the safe operation range of the ground pipeline is judged by pressure detection pieces arranged on the gas inlet pipe and the gas outlet pipe;
and after the gas lift of the compressor is finished, recovering the normal production flow of the gas well, discharging the pressure relief device of the gas lift wellhead of the differential pressure compressor after pressure relief, opening a liquid discharge valve to discharge the liquid remained in the pressure relief device, and preparing the anti-corrosion and proper storage of the pressure relief device of the gas lift wellhead of the differential pressure compressor.
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| US20040211199A1 (en) * | 2003-04-23 | 2004-10-28 | Yukikatsu Ozaki | Vapor-compression refrigerant cycle with ejector |
| US20160084038A1 (en) * | 2013-04-29 | 2016-03-24 | Typhonix As | Flow and fluid conditioning pressure reducing valve or device |
| CN212054648U (en) * | 2020-05-13 | 2020-12-01 | 西安朗益软件科技有限公司 | Differential pressure type compressor gas lift wellhead pressure reducing device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103912244A (en) * | 2014-03-31 | 2014-07-09 | 北京恩瑞达科技有限公司 | Mobile compressor gas lift |
| CN106215569A (en) * | 2016-08-23 | 2016-12-14 | 成都正升能源技术开发有限公司 | There is the gas-liquid separator of explosion prevention function |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040211199A1 (en) * | 2003-04-23 | 2004-10-28 | Yukikatsu Ozaki | Vapor-compression refrigerant cycle with ejector |
| US20160084038A1 (en) * | 2013-04-29 | 2016-03-24 | Typhonix As | Flow and fluid conditioning pressure reducing valve or device |
| CN212054648U (en) * | 2020-05-13 | 2020-12-01 | 西安朗益软件科技有限公司 | Differential pressure type compressor gas lift wellhead pressure reducing device |
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