DE1016203B - Device for regulating the liquid filling of a casing string when it is lowered into a deep borehole - Google Patents

Description

The invention relates to a device for regulating the automatic filling of a casing string when sinking into a deep borehole filled with liquid.

The new “device has a flow cross-section that narrows in a manner known per se elastic perforated disc on which a valve body, preferably a ball, is forced through their bore allows through downwards, but a backward displacement of the valve body upwards locks.

In known devices of this type, which are mainly used for cementing boreholes found, the perforated disks were provided with relatively large openings and designed so that the perforated disc shoulder bending downwards when the valve body moves downwards is just wide was enough to prevent the ball from moving back up through the perforated disk. With these older devices there was a control of the rate of the downhole fluid as it subsided a pipe string is not possible.

According to the invention, automatic regulation is used in a device of the aforementioned type the borehole fluid achieved in that the upper surface of the perforated disc in such a way by a Annular bead is supported that a central ring section of the perforated disc under one from below acting fluid pressure can be bent freely upwards, the cross section of the bore as a function of pressure is stretched.

With such a design of the device, the perforated disc will move if it moves too fast Lowering the pipe string compared to the pressure prevailing on the underside of the perforated disc the existing pressure above this disk is greatly increased, bend upwards and enlarge so that a larger amount of fluid flows through the bore and flows into the pipe string above. When the pressure gradient is reduced, the bore is reduced in size, so that the one flowing into the pipe string The amount of liquid becomes smaller.

The work of the new device can be improved by placing a fragile one over the perforated disk Stop is arranged. This stop does the important job of moving upwards to support flexing perforated disc, so that the hole expands only up to a certain size and the rate of flow of the fluid in the casing string as it descends in the wellbore is limited. This stop also prevents the valve body from being pushed through the perforated disk will. Rather, it must first be a certain pressure that the shear strength of the stop over device to regulate

the liquid filling

of a casing string

when lowering into a deep borehole

ίο applicant:

Baker Oil Tools, Inc.,
Los Angeles, Calif. (V. St. A.)

Representative:
Dr.-Ing. K. Boehmert and Dipl.-Ing. A. Boehmert,

Patent attorneys, Bremen, Feldstr. 24

Claimed priority:

V. St. v. America April 2, 1954

Earnest Hubert Clark Jr., Downey, Calif. (V. St. Α.),
has been cenanni as the inventor

steps, come to action before the stop is released and the valve body comes into contact with the perforated disc comes.

Some embodiments of the invention are in the following part of the description with reference to the drawings described. In the drawings is

Fig. 1 is a longitudinal section through an embodiment of the invention in which the valve body in its upper position is shown,

Fig. 2 is a section similar to Fig. 1 showing how the valve body is pushed through the variable opening of the device;
Fig. 3 is a section similar to Fig. 1 showing the valve body in a position in which it prevents an upward flow of liquid in the device;

4 shows a cross section on an enlarged scale according to line 4-4 of Fig. 1,

Fig. 5 is a partial longitudinal section of part of the device on a larger scale,

6 shows a section similar to FIG. 1 of another embodiment,

709 698/106

3 4

7 shows a longitudinal section through which the cement filling 15 is held with a change. This upper opening provided component of the housing 31 in FIG. 6 can contain a check valve 32, a preferred device, this opening being in the form of a ball, which is in a second cement position and floats mud. The upward movement of this FIG. 8, a section similar to FIG. 7 with the opening 5 ball 32, is limited by its application to several stop lugs 33 distributed on the opening in a different position and circumference; FIG. 9 is a longitudinal section through the In FIG. 6, the upper housing 31 is made of one piece and the valve body protrudes below and inward. The inner diameter of the half of the variable opening is. Upper housing 31 is much larger than the diameter of the device shown should the speed io meter of the ball 32, so that liquid to regulate the speed with which the ball 32 in the borehole and between the stop lugs 33 in liquid in a pipe string od The like. Flows when the upper of this string located above the device A can flow in the borehole to the desired depth of pipe section B.

is lowered. The device also prevents that in the cement filling 15 is also a for that

Upward or backward flow of the liquid 15 ball valve specific lower valve housing part or in the pipe after filling the pipe with borehole lower casing 34, the upper end of which in the lower liquid, whereby, for example, a backflow portion of the lower valve housing 28 is guided, of cement in the pipe string after completion of this lower housing 34 is essentially the same Cementation is prevented. Upper housing 31, however, is opposite to this housing

The device shown is arranged in a tube 20 with the mouth upwards. The sub-section A is accommodated, that with the upper tubular housing 34 also has section B distributed around the circumference and the lower tubular section C with stop lugs 35 to which the valve ball 32 can be tied. However, the device can be applied after the ball 32 forms the lower end of the pipe string in the manner described below through the opening 22, the hole is then to be regarded as a pipe shoe. 35 disk 21 has been pushed through. The sub-The device consists of an outer tube 10 housing 34 also has an inner diameter with an upper threaded portion 11, which is much larger than the ball diameter, so the lower pin end 12 of the upper pipe section B that liquid is screwed up between the ball and the housing , and can flow through from a lower pin when the ball 32 is in the lower-shaped threaded section 13, which is located in the upper 30 housing 34.

Threaded section 14 of the lower tube section C The ball 32 is first inserted into the upper housing 31

is screwed in. The device A includes an inserted. The smallest diameter of the upper valve assembly, which preferably consists of an easily drilled valve housing 19, namely the diameter of the inner material. An inner portion of the pipe wall 30, is slightly larger than the diameter of 10 can be provided with a cement filling 15, the 35 ball 32, so that the ball in the upper valve housing by means of rib-like, in inner grooves 17 of the pipe 10 19 is pressed down and on the perforated disk 21 engaging outer ribs 16 is anchored. Which can be laid. If the pressure on the cement filling 15 is strong enough, a multi-part valve encloses the ball 32, the ball rests on the perforated disk 21 housing 18, which is held in the cement filling 15 and extends its opening 22 so far that the upper valve housing 19 has its inwardly 40 ball through this opening into the lower projecting annular bead 20 a relatively valve housing 28 and the lower housing 34 forces, broad transverse surface, which at the upper surface of a It is not desirable, however, that the ball 32 be made of rubber or a rubber-like Substance inadvertently rests through the opening 22 of the perforated disk 21. The perforated disc 21 moved through it. For this reason, in its middle section a comparatively 45 upper valve housing 19 has a stop ring 36 above the perforated disc 21 made of rubber , Upper valve housing 19 are thereby fastened, This stop ring 36 allows a circumferential rib 23 of the valve housing 19 in the opening 22 that a circumferential rib 23 of the valve housing 19 only then, after the ball has moved downwards, down into a corresponding upper groove 24 of the hole 5 ° when this movement of the ball is desirable. The disk 21 protrudes. The perforated disk 21 also has a stop ring 36 has an outer ring 37 which anchors cement filling 15 in the circumferential groove 25 for receiving a rib 26 of a bore 138 in the upper valve housing 19, so that the perforated disk 21 with the cement filling 15 positioned above its smallest diameter 30 is anchored will. From the hole is. This metallic ring 37 consists of a disk 21 protrudes a relatively short edge 55 piece with a seat ring 38, the flange 27 on the outer ring down. In this edge flange 27 the 37 is inserted by means of a relatively short circumferential lower cylindrical valve housing 28. The area 39 is secured. The seat ring 38 protrudes from the inner wall 29 of the lower valve housing 28, the outer ring 37 is a relatively small distance inwardly from the inner wall 30 of the annular bead and has an upper valve housing 19 that rests against the ball for a surface 40 mentioned later separable surface 39 has purpose offset to the outside. the inner section 38 has an outer circumference 41 which controls the inner wall 30 of the upper valve housing 19, which is made of rubber.

the pipe into the fluid in the borehole. The device A is lowered in the Fig. 1 is shown. It is also desirable that the initial layer made of rubber 65 on the upper pipe section B , or perforated disk 21, is fastened as a valve seat into and on the lower pipe section C. FIG. The device's built-in check valve is used. The tubing string is lowered in the upper end of the upper valve housing 19 located in the borehole takes on liquid, the liquid being in the lower end of an upper valve housing part or in the opening 22 of the upper housing 31 made of rubber, which extends from the upper section 70 disk 21 flows upwards and the ball 32 after

is offset outwards so that the inner diameter of the lower valve housing 28 is substantially larger than the diameter of the ball 32. The ball 32 is pressed in this way through the perforated disk 5 21 into the lower valve housing 28 and the lower housing 34 and comes up the stop lug 35 to rest. After the ball has passed and after the pressure in the pipe string above device A has been released

at the top of the upper stop lugs 33. the
Liquid can then around the ball 32 in the
overlying pipe section B flows and fills
automatically the drill pipe with the borehole fluid.
As a result of the limited area of the opening 22 can
the liquid only moves in at a limited speed
the pipe string flow so that an overflow at the
Top of the borehole is prevented. With one too
The rapid lowering of the pipe string rises on the

Underside of the perforated disk 21 prevailing pressure in the io, the perforated disk 21 again shows its in Fig. 1 " Compared to the initial shape provided above this disc.

Pressure so high that the perforated disc 21 is upwards. Liquid can now be in the pipe string

bends out and the opening 22 enlarges, so that the upper housing 31, a larger amount of liquid, is pumped down through the opening, the upper valve housing 19 and the opening 22 and flows into the pipe string above. 15 disk 21, the lower valve housing 28 and the Da flows through the opening surface of the perforated disk 21 with the lower housing 34. The liquid flows as the pressure gradient increases, then a larger amount of liquid automatically flows around the ball 32 between the lower stop in the collar 35 down into the lower pipe-pipe string as the pressure gradient increases. section C, in order to then flow out of the pipe string as the pressure drop decreases, ao _: flow.

the opening 22 so that the pipe string inserted into the pipe string is cemented into the borehole

flowing amount of liquid becomes smaller. then the required cement slurry

The tubing string is pumped down the wellbore during the amount in the tubing string and lowering temporarily held in rest position in order to flow through the opening 22. When the the top of the borehole additional pipe 25 above the perforated disk 21 pressure to attach sections to the strand. When it comes to a standstill, the disc bends downwards so that the

Opening 22 is enlarged and the device A is traversed by a larger amount of cement slurry. The cement slurry flows out of the pipe which is slightly less than the pressure outside the pipe string. 3 ° half of the device A and then rises in the customary, the pipe is slightly lifted between the outside of the pipe string and the

Borehole wall located annulus upwards. After settling a sufficient amount of cement slurry behind the pipe string is the inside of the pipe-By this upward movement, the ball 32 35 strand located pressure is canceled. The cement after at the bottom of the separable seat ring 38 - sludge will then flow back into the pipe string, placed, however, this seat ring with the outer one moves the ball 32 upwards, so Stop ring by such a strong metal mass that the ball 32 rests against the perforated disk 21, bound that substantial pressures are absorbed. The ball 32 closes the opening 22 so that can. As a result, the ball 32 will not be able to flow through the opening 22 after 40, down through opening 22 into the lower one. When the back pressure is high, it pushes the ball Valve housing 28 and the lower housing 34 printed. only upwards to the disk 21 upwards from the Tubing string will bend so deeply in the borehole. However, the upper valve housing 19 protrudes lowers until it reaches the desired depth, the being quite far inward, and the diameter of the Perforated disk 21, the liquid 45 inner wall 30 of this valve housing 19 flowing into the pipe is only something automatically regulates the quantity. After reaching the larger than the diameter of the ball. The ball 32 desired depth and after filling the tube with, therefore, the rubber material of the disc jams between liquid is located in the pipe string and see the upper valve housing 19 with Lent liquid a pressure brought into action, great force. The rubber washer prevents a which pushes the ball 32 downward against the valve seat 38 50 upward flow of the liquid to the upper valve. When the liquid pressure rises on housing 19, even at very high pressure the shear strength of surface 39 of the slope.

Beat 36 corresponding value, for example after setting and setting of the cement

70 kg / cm ² , the seat ring 38 is sheared from the outer ring of sludge, the inner structure of the device A 37 is sheared, the seat ring is moved downwards in the passage 30 55 by means of a drill bit (not shown) and reduced to the upper surface of the hole . Essentially, the entire internal structure consists of an easily drilled material. The cement filling 15, the upper and lower housings 31 and 34, respectively, the upper and lower valve housings 19 and 28, respectively

of the pipe string can flow further through the
Flow through opening 22 until the hydrostatic
Pressure of the liquid within the pipe string

Pipe from the slips (not shown) of the
To clear the turntable (not shown) before the
Pipe string is lowered again into the borehole.

disk 21 applied. After reaching the below the
Passage 30 located perforated disk 21 divides the
acting on the inclined seat 40 pressure of the

Ball the seat ring 38 and presses the parts to ⁶ ° and the rubber washer 21 can be easily drilled. The outside in the rubber material. The ball can then housing and the valve parts can be made of synthetic resin under the pressure of the pumped liquid, while the stop 36 for the ball 32 from perforated disk 21 stretches, the perforated cast iron can consist, which can also be easily drilled disk 21 after down and out and stretch that is. Thus, the internal construction, with the aid of a drilling opening 22 so far out that the ball finally ⁶ S chisel be easily removed. Since the internal structure passes completely through the opening 22 (Fig. 2). is only short, little time is required for chopping the downward and lateral stretching of the necessary.

Perforated disk 21 can be made, as the lower surface The ball 32 does not have to be in front of the pipe string

of the disc of the lower valve housing 28 can only be used to lower it in the borehole, but rather is little supported, the inner wall 29 of which since the ball can later be inserted into the tube.

Claims (6)

7 8 bring. In this case, the upper housing 31 is not accidentally pushed through required, so that the device much shorter disc 21 in the lower valve housing 28 and the can be executed. The ball is attached to the lower housing 34. the top or near the top of the cement- When lowering the pipe with the one shown in Fig. 6, brought mud filling when the filling flows in the 5 set device in the borehole Pipe string is pumped down. After reaching liquid as in the first mentioned execution the perforated disk 21 made of rubber is pushed up through the opening 22. When enlarging the The ball through the opening 22 into the lower pressure gradient on the rubber washer 21 is the Valve housing 28 and the lower housing 34 pressed, disc 21 bent upwards and the surface of the then shifts upwards, attaches itself to the opening 22 enlarged. If the pressure gradient increases, disc 21, seals the disc and then prevents the disc, which is bent upwards, from settling a backflow of the liquid in the opening 22 finally to the support plate 50, which is another up to the pipe string. With this design, bending and enlarging the opening area is spoiled Stop 36 with its separable seat ring 38 prevents. When applying the rubber washer 21 to the not mandatory. 15 support plate 50, the area of the opening 22 is preferably The perforated disk made of rubber can also be smaller than the area of the opening 52 of the support plate 50 can be used without a check valve or ball 32 The one around the pipe depending on the pressure gradient is the one around the opening 22 Orifice plate 21 to fill the prevailing pressure gradient. Rubber material partially in the opening 52 (Fig. 8) If the ball 32 is not used, the ao can also be pushed in. This deformation of the rubber lower case 34 can be omitted. materials, the opening 22 is reduced so that the In certain strings of tubing at boreholes, the speeds are those flowing through the opening sometimes Einmittungsvorrichturigen and wall and flowing into the overlying pipe string built-in scraper to ensure proper cement- liquid is decreased or delayed, ring to lay around the pipe when cementing. The device shown in FIG like devices are effective, but so scratch the rate at which the liquid enters drilling sand and rock debris from the soil layer flows through the pipe string, so that the safety this material consists in the between the tubing that in the borehole is a large fluid string and the annulus located in the wall of the borehole there is an amount of space which falls within the around the pipe. The lowering of the pipe string in the borehole 3o string located space flows upwards and displaces a corresponding volume of liquid, so rock debris and other substances up to the Oberdaß the liquid in the borehole promotes to the side of the borehole or these substances minoben rises and flows out of the head of the borehole at least so far upwards that the formation flows. This upward flow of fluid takes away from bridges and similar restrictions in the well a large part of the rock rubble, which is 35 holes prevented. was broken out of the wall of the borehole. After lowering the pipe string to the If this material is not removed, then it can reach the desired depth and after the complete filling of the Lowering of the tubing string in the wellbore due to tubing with the fluid bridging in the wellbore limit or prevent. the liquid in the pipe can In the device described, the pressure acting from above can be subjected to the opening 22 of the perforated disk 21 when the pressure is increased on the ball 32 downwards and the upper pressure gradient on the disk 21 opens quite wide, the seating surface 53 of the support plate 50 creates. In geso that a large portion of the wellbore fluid with nügendem pressure (for example, 70 kg / cm ^2), the high speed in the tubing string above the support plate 50 as a result of the surface 51 of the upper Venströmt and around the tubing string around * ⁵ tilgehäuse 19a separately. The plate 50, however, not only separates such a small amount of liquid upwardly but also flows into many that removal of rock debris and small pieces of being made of cast iron or prevention of bridging and the like are easy to break There is drillable material, there is no constriction. This disadvantage is eliminated in the embodiment shown in FIGS. 6-9. 5 <> Ball 32 through the opening 22 of the disk 21 - the device corresponds in its general to being pushed through. The ball 32 is also pushed in the construction of the embodiment already described, through the opening 22 into the lower valve hole, the opening 22 can only extend up to a housing 28 and the lower housing 34, in which the specific size is expanded. Instead of a ball later works as a non-return valve, the impact ring 36 protrudes an annular support plate 55 moves upwards and rests on the perforated disc made of rubber from the upper valve housing 19 α quite far as the associated valve seat. The inside. The support plate 50 lies in a small, shredded piece of the support plate 50, spaced above the hole made of rubber, then completely swept out of the device A , disk 21 and protrudes from the valve housing 19 α. The device shown in FIG. 6 operates in one formed from separable fabric proportionately 60 all relationships in the same way as the pre-small Area 51 in connection. The support plate 50 direction according to FIGS. 1 to 5. The device according to has an opening 52, the area of which is significantly larger is than the area of the opening 22 of the disc 21 if rubber washer 21 is present through opening 22 there is no pressure gradient on the disc. The and shrinks this opening when the pressure gradient The area of the support plate opening 52 may be equal to that 65 becomes excessively large, desired largest area to be made so that the Flow rate of the liquid in the drilling patent claims: pipe is limited when sinking in the borehole. The support plate 50 also serves as a stop for the 1st device for regulating the liquid Valve ball 32 "and protects the valve ball first from filling a casing string when descending I 016 let into a deep borehole, ζ. B. pipe shoe, from a piece of pipe that is a component of the pipe string forms and has an elastic perforated disc narrowing the flow cross-section, which forcing a valve body, preferably a ball, through its bore allows downward displacement of the valve body upward, however, blocks, characterized in, that the upper surface of the perforated disc (21) in such a way by an annular bead (20) is supported that a central ring section of the perforated disc (21) under one acting from below Fluid pressure can be bent freely upwards, the cross section of the bore (22) in Depending on the pressure is stretched. 2. Apparatus according to claim 1, characterized in that the bead (20) has a shearable, brittle stop ring (30, 56), which the downward movement of the valve body (32) limited to the perforated disc (21) until a predetermined pressure is reached. 3. Device according to claims 1 and 2, characterized in that this above and / or is provided with stop lugs (33, 35) for the valve body at the bottom. 4. Device according to claims 2 and 3, characterized in that the stop ring (36.50) is provided with a seat (40.53) which forms a seal with the valve body (32). 5. Device according to claims 2 to 4, characterized in that the stop ring (50) has an opening (52), the size of which is a predetermined maximum size flowing through the tube (10) Flow rate corresponds. 6. Device according to claims 2 to 5, characterized in that the stop ring (50) is so close to the perforated disc (21) that it is under a fluid pressure acting from below serves as a support plate for the perforated disc (21). Considered publications:
U.S. Patent No. 2,117,536. 1 sheet of drawings © 709 598/106 9. 57