CN111980638A - Temporary plugging sieve tube, well completion pipe string and running method of well completion pipe string - Google Patents
Temporary plugging sieve tube, well completion pipe string and running method of well completion pipe string Download PDFInfo
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- CN111980638A CN111980638A CN202010886906.3A CN202010886906A CN111980638A CN 111980638 A CN111980638 A CN 111980638A CN 202010886906 A CN202010886906 A CN 202010886906A CN 111980638 A CN111980638 A CN 111980638A
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000012530 fluid Substances 0.000 claims abstract description 29
- 238000007789 sealing Methods 0.000 claims abstract description 18
- 239000011248 coating agent Substances 0.000 claims description 17
- 238000000576 coating method Methods 0.000 claims description 17
- 229920001187 thermosetting polymer Polymers 0.000 claims description 16
- 238000005086 pumping Methods 0.000 claims description 11
- 238000002955 isolation Methods 0.000 claims description 9
- 125000006850 spacer group Chemical group 0.000 claims description 6
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- 238000000926 separation method Methods 0.000 description 12
- 239000007788 liquid Substances 0.000 description 9
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 8
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- 230000002378 acidificating effect Effects 0.000 description 2
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- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 229910000805 Pig iron Inorganic materials 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
- E21B43/02—Subsoil filtering
- E21B43/10—Setting of casings, screens, liners or the like in wells
-
- 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
- E21B43/02—Subsoil filtering
- E21B43/08—Screens or liners
- E21B43/086—Screens with preformed openings, e.g. slotted liners
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- Fluid Mechanics (AREA)
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Abstract
The present disclosure provides a temporary plugging screen pipe, a completion pipe string and a running method of the completion pipe string, wherein the temporary plugging screen pipe comprises: the sieve tube body is provided with sieve holes which are circumferentially arranged on the outer wall of the sieve tube body; the soluble lining pipe is coaxially inserted into the sieve pipe body, the outer wall of the soluble lining pipe is in sealing fit with the inner wall of the sieve pipe body, and the soluble lining pipe covers all the sieve holes in the sieve pipe body. The temporary plugging sieve tube can more tightly plug sieve holes of the temporary plugging sieve tube, avoids great loss of well killing fluid, can quickly complete the assembly of the temporary plugging sieve tube, and is convenient to use.
Description
Technical Field
The disclosure relates to the technical field of sand control of oil and gas wells, in particular to a temporary plugging sieve tube, a well completion pipe string and a running method of the well completion pipe string.
Background
The gas storage is mostly established in exhausted oil and gas reservoirs which cannot be exploited due to the limitation of conditions such as technology, economy and the like, so that the aims of easy injection and exploitation and maximized improvement of injection and exploitation capacity are fulfilled. The depleted oil-gas reservoir is generally low due to the fact that the formation pressure coefficient is low, in the well completion process of long construction time, the well killing fluid introduced into the well descending pipe column is prone to leaking, the reservoir channel is easily blocked after the well killing fluid leaks to the reservoir, and then the injection and production capacity of the gas storage reservoir is reduced.
In the related art, a temporary plugging screen is usually installed at the bottom end of the running string to prevent loss of the killing fluid from the running string to the reservoir. The temporary plugging sieve tube adopted in the related technology comprises a sieve tube body and soluble pins, and the soluble pins are inserted into sieve holes in the sieve tube body so as to temporarily plug the sieve holes of the sieve tube body. When the sieve pores of the sieve tube body need to be communicated, solution is introduced into the underground pipe column to dissolve the soluble pins, so that the sieve tube body can be normally used.
However, due to the processing errors of the soluble pins and the sieve tube body, the problem of poor sealing exists after the soluble pins are installed on sieve holes of the sieve tube body, and then well killing fluid is leaked; and the temporary plugging sieve tube in the related technology needs technicians to plug the soluble pins on the sieve tube body one by one to plug the sieve holes before use, so that the workload is large, and the temporary plugging sieve tube is not convenient to rapidly complete the assembly of the temporary plugging sieve tube.
Disclosure of Invention
The embodiment of the disclosure provides a temporary plugging sieve tube, a well completion pipe column and a running method of the well completion pipe column, which can more tightly plug sieve holes of the temporary plugging sieve tube, avoid a large amount of loss of well killing fluid, can quickly complete the assembly of the temporary plugging sieve tube and are convenient to use. The technical scheme is as follows:
the embodiment of the present disclosure provides a temporary plugging screen pipe, which includes: the sieve tube body is provided with sieve holes which are circumferentially arranged on the outer wall of the sieve tube body; the soluble lining pipe is coaxially inserted into the sieve pipe body, the outer wall of the soluble lining pipe is in sealing fit with the inner wall of the sieve pipe body, and the soluble lining pipe covers all the sieve holes in the sieve pipe body.
In one implementation manner of the embodiment of the present disclosure, the soluble lining pipe includes a lining pipe body and a tensioning structure, the lining pipe body is coaxially located inside the screen pipe body, and the tensioning structure is located inside or outside the lining pipe body, so that the lining pipe body and the screen pipe body maintain an interference fit.
In another implementation manner of the embodiment of the disclosure, the tensioning structure includes a first tensioning ring and a second tensioning ring, the first tensioning ring is in threaded connection with the second tensioning ring, and the first tensioning ring is coaxially inserted into the liner tube body; the inner wall surface of the first tensioning ring and the outer wall surface of the second tensioning ring are conical surfaces; alternatively, the tensioning structure comprises an air bag.
In another implementation manner of the embodiment of the disclosure, the tensioning structure is a thermosetting expansion coating, and the thermosetting expansion coating covers the outer wall of the lining pipe body and is connected with the outer wall of the lining pipe body and the inner wall of the screen pipe body.
In another implementation of the disclosed embodiment, the sum of the areas of all the screen holes on the screen body is not less than the cross-sectional area of the screen body.
The embodiment of the disclosure provides a well completion pipe column, which comprises an oil pipe, a blind plugging guide shoe, a packer and the temporary plugging sieve pipe, wherein the blind plugging guide shoe, the temporary plugging sieve pipe and the oil pipe are sequentially connected, and the packer is sleeved outside the oil pipe.
In another implementation manner of the embodiment of the present disclosure, the completion string further includes a spacer disc, one side of the spacer disc is connected to the temporary plugging screen pipe, and the other side of the spacer disc is connected to the oil pipe.
The disclosed embodiments provide a method of running a completion string, adapted to run the completion string described above into a well, the method comprising: controlling the completion string to be lowered into the well to a set position; injecting a solution from the tubing into the completion string; injecting well killing fluid into the oil pipe through a pump, controlling the pressure in the oil pipe to reach a first pressure, and setting the packer; continuing to pump the well killing fluid into the oil pipe until the pressure in the oil pipe is increased from the first pressure to a second pressure, so that the isolation disc falls off; and plugging the oil pipe until the soluble lining pipe is dissolved.
In another implementation of the disclosed embodiment, after setting the packer, the setting includes: and pumping the well killing fluid into an annular space between the oil pipe and a casing of the shaft, controlling the pressure in the annular space to reach a third pressure, and checking the seal of the packer, wherein the third pressure is not more than the second pressure.
In another implementation of the disclosed embodiment, plugging the oil pipe until after the soluble liner pipe dissolves comprises: and pumping the killing fluid into the oil pipe to flush the residual dissolved matters in the sieve tube body.
The beneficial effects brought by the technical scheme provided by the embodiment of the disclosure at least comprise:
the temporary plugging sieve tube provided by the embodiment of the disclosure comprises a sieve tube body and a soluble inner lining tube, wherein the sieve tube body is provided with sieve holes which are circumferentially arranged, the soluble inner lining tube is coaxially inserted into the sieve tube body, and after the soluble inner lining tube is inserted into the sieve tube body, the outer wall surface of the soluble inner lining tube is contacted with the inner wall surface of the sieve tube body, so that the soluble inner lining tube can cover the inner wall surface of the sieve tube body, the soluble inner lining tube completely covers all the sieve holes on the sieve tube body in the embodiment of the disclosure, and the inner wall of the sieve tube body is in sealing fit with the outer wall of the soluble inner lining tube, therefore, after the soluble inner lining tube is inserted into the sieve tube body, all the sieve holes on the sieve tube body can be. When the temporary plugging sieve tube needs to be used, solution can be injected into the temporary plugging sieve tube to dissolve the soluble lining tube, so that the sieve holes on the sieve tube body are communicated again. The temporary plugging sieve tube in the embodiment of the disclosure only needs to finish machine a single soluble lining tube, namely, the problem of poor sealing performance caused by machining errors is avoided, so that the temporary plugging sieve tube adopting the soluble lining tube to plug the sieve tube body can plug the sieve pores of the temporary plugging sieve tube more tightly, and the loss of a large amount of well killing fluid is avoided. And, during assembly, the soluble lining pipe is inserted into the sieve pipe body, so that all sieve holes can be sealed, the assembly of the temporary plugging sieve pipe can be rapidly completed, and the sieve pipe is convenient to use.
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 front view of a plugging screen according to an embodiment of the present disclosure;
FIG. 2 is a cross-sectional view of a plugging screen according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of a construction of a plugging temporary screen provided by an embodiment of the disclosure;
FIG. 4 is a schematic view of another embodiment of the present disclosure;
FIG. 5 is a schematic diagram of a completion string provided by embodiments of the present disclosure;
FIG. 6 is a flow chart of a method of running a completion string provided by an embodiment of the present disclosure.
The symbols in the drawings represent the following meanings:
1-sieve tube body, 10-sieve pore;
2-a soluble lining pipe, 20-a lining pipe body, 21-a first tension ring, 22-a second tension ring and 23-an air bag;
3-a separation disc;
41-oil pipe, 42-blind plugging guide shoe and 43-packer;
g-temporary plugging the screen pipe.
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.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," "third," and similar terms in the description and claims of the present disclosure are not intended to indicate any order, quantity, or importance, but rather are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprise" or "comprises", and the like, means that the element or item listed before "comprises" or "comprising" covers the element or item listed after "comprising" or "comprises" and its equivalents, and does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", "top", "bottom", and the like are used merely to indicate relative positional relationships, which may also change accordingly when the absolute position of the object being described changes.
In the related art, in order to avoid a large amount of loss of the killing fluid, a temporary plugging screen is usually installed at the bottom end of the running string to temporarily plug the passage between the running string and the reservoir. And the temporary plugging screen pipe in the related art comprises a screen pipe body and soluble pins, and the soluble pins are inserted into the screen holes on the screen pipe body.
Because the sieve tube body is usually provided with a plurality of pins, namely a plurality of pins are needed to be used for plugging a plurality of sieve holes on the sieve tube body, a plurality of pins need to be accurately processed to ensure that each pin can well seal the temporary plugging sieve tube of the sieve holes, however, the soluble pins and the sieve tube body have processing errors, and the soluble pins are installed on the sieve holes of the sieve tube body and then have the problem of poor sealing, thereby causing the leakage of well killing fluid; and the temporary plugging sieve tube in the related technology needs technicians to plug the soluble pins on the sieve tube body one by one to plug the sieve holes before use, so that the workload is large, and the temporary plugging sieve tube is not convenient to rapidly complete the assembly of the temporary plugging sieve tube.
FIG. 1 is a front view of a plugging screen according to an embodiment of the present disclosure. As shown in fig. 1, the plugging screen comprises: the screen pipe comprises a screen pipe body 1 and a soluble lining pipe 2.
As shown in fig. 1, the outer wall of the screen body 1 has a plurality of circumferentially distributed screen holes 10.
Fig. 2 is a cross-sectional view of a plugging screen according to an embodiment of the present disclosure. As shown in fig. 2, the soluble lining pipe 2 is coaxially inserted into the screen pipe body 1, the outer wall of the soluble lining pipe 2 is in sealing fit with the inner wall of the screen pipe body 1, and the soluble lining pipe 2 covers all the screen holes 10 on the screen pipe body 1.
The temporary plugging sieve tube provided by the embodiment of the disclosure comprises a sieve tube body 1 and a soluble inner lining tube 2, wherein the sieve tube body 1 is provided with circumferentially arranged sieve holes 10, the soluble inner lining tube 2 is coaxially inserted into the sieve tube body 1, and after the soluble inner lining tube 2 is inserted into the sieve tube body 1, the outer wall surface of the soluble inner lining tube 2 is contacted with the inner wall surface of the sieve tube body 1, so that the soluble inner lining tube 2 can cover the inner wall surface of the sieve tube body 1, and in the embodiment of the disclosure, the soluble inner lining tube 2 completely covers all the sieve holes 10 on the sieve tube body 1, and the inner wall of the sieve tube body 1 is in sealing fit with the outer wall of the soluble inner lining tube 2, so that after the soluble inner lining tube 2 is inserted into the sieve tube body 1, all the sieve holes 10 on the sieve tube body 1 can be guaranteed. When the temporary plugging screen pipe needs to be used, solution can be injected into the temporary plugging screen pipe to dissolve the soluble lining pipe 2, so that the screen holes 10 on the screen pipe body 1 are communicated again.
The temporary plugging sieve tube in the embodiment of the disclosure only needs to finish machine the single soluble lining tube 2, that is, the problem of poor sealing performance caused by machining errors is avoided, so that the temporary plugging sieve tube adopting the soluble lining tube 2 to plug the sieve tube body 1 can plug the sieve pores 10 of the temporary plugging sieve tube more tightly, and the loss of a large amount of killing fluid is avoided. And, during assembly, the soluble lining pipe 2 is inserted in the sieve pipe body 1 to seal all the sieve pores 10, thereby avoiding the assembly mode that all the sieve pores 10 are sealed one by adopting pins, rapidly completing the assembly of the temporary plugging sieve pipe and being convenient for use.
In the disclosed embodiment, the soluble liner tube 2 may be an aluminum alloy tube, which may use an acidic liquid as a dissolving solution, for example, the dissolving solution may be a sulfuric acid solution. When the temporary plugging sieve tube needs to be communicated, a sulfuric acid solution can be injected into the temporary plugging sieve tube, and the soluble lining tube 2 on the inner wall of the sieve tube body 1 is dissolved by the sulfuric acid solution, so that the sieve holes 10 on the sieve tube body 1 are communicated.
The outer diameter of the soluble lining pipe 2 can be 1mm to 3mm larger than the inner diameter of the screen pipe body 1, so that the soluble lining pipe 2 and the screen pipe body 1 can be in interference fit to ensure the sealing performance, and the outer wall of the soluble lining pipe 2 is in sealing fit with the inner wall of the screen pipe body 1.
Alternatively, the soluble lining pipe 2 may comprise a lining pipe body 20 and a tensioning structure, the lining pipe body 20 is coaxially located in the screen body 1, and the tensioning structure is located in or outside the lining pipe body 20, so that the lining pipe body 20 and the screen body 1 maintain an interference fit. Because the soluble lining pipe 2 is provided with the tensioning structure which can enable the lining pipe body 20 and the screen pipe body 1 to keep interference fit, namely mutual extrusion exists between the lining pipe body 20 and the screen pipe body 1, after the lining pipe body 20 is inserted into the screen pipe body 1, the tensioning structure increases the friction force between the outer wall surface of the lining pipe body 20 and the inner wall surface of the screen pipe body 1, and therefore the lining pipe body 20 is more firmly fixed in the screen pipe body 1. Meanwhile, the sealing performance between the lining pipe body 20 and the screen pipe body 1 can be improved, and all the screen holes 10 on the screen pipe body 1 can be ensured to be temporarily blocked by the soluble lining pipe 2.
In the embodiment of the disclosure, if the tensioning structure is disposed on the inner wall of the liner tube body 20, at least the following implementation manners may be included.
Fig. 3 is a schematic structural diagram of a plugging screen according to an embodiment of the disclosure. As shown in fig. 3, the tensioning structure may include a first tensioning ring 21 and a second tensioning ring 22, the first tensioning ring 21 is in threaded connection with the second tensioning ring 22, and the first tensioning ring 21 is coaxially inserted into the liner tube body 20; the inner wall surface of the first tension ring 21 and the outer wall surface of the second tension ring 22 are both conical surfaces. That is, in this implementation manner, the inner wall surface of the first tension ring 21 and the outer wall surface of the second tension ring 22 are both provided with threads, and the first tension ring 21 and the second tension ring 22 are connected through the threads.
The outer diameter of the first tension ring 21 may be the same as the inner diameter of the liner tube body 20, and the outer wall surface of the first tension ring 21 is a cylindrical surface, so that the first tension ring 21 can be tightly attached to the liner tube body 20. When the sieve tube is used, the second tension ring 22 is screwed into the first tension ring 21 through the threads on the outer wall surface of the second tension ring 22, and since the surface where the first tension ring 21 and the second tension ring 22 are in threaded connection is a conical surface, in the process that the second tension ring 22 is gradually screwed into the first tension ring 21, the second tension ring 22 gradually tensions the inner wall of the first tension ring 21, and simultaneously, the radial acting force applied to the first tension ring 21 is gradually increased, so that the radial acting force applied to the liner tube body 20 by the first tension ring 21 is increased, and thus, the liner tube body 20 transmits the radial acting force to the sieve tube body 1, the liner tube body 20 and the sieve tube body 1 are in interference fit, the liner tube body 20 is more firmly fixed in the sieve tube body 1, and the sealing performance between the liner tube body 20 and the sieve tube body 1 is improved, ensuring that all the screen holes 10 on the screen body 1 are temporarily blocked by the soluble lining pipe 2.
For example, the first tension ring 21 may be a soft ring, for example, a rubber ring made of rubber, so that the first tension ring 21 can deform after being pressed while having a certain hardness, thereby pressing the liner tube body 20. The second tensioning ring 22 may be a hard ring, for example, a metal ring made of metal, so that when the second tensioning ring 22 tensions the first tensioning ring 21, the first tensioning ring 21 can be deformed uniformly in the circumferential direction, even if all parts of the liner tube body 20 can be pressed uniformly.
Fig. 4 is a schematic structural view of another temporary plugging screen according to an embodiment of the disclosure. As shown in fig. 4, in the temporary plugging screen pipe, the tensioning structure may be an air bag 23, and the air bag 23 may be expanded by inflating the air bag 23 to tension the lining pipe body 20.
In the embodiment of the disclosure, before the temporary plugging screen pipe is put into the well, the air bag 23 may be placed in the lining pipe body 20, and then the air pump is used to inflate the air bag 23, so that the air bag 23 can support the lining pipe body 20, thereby applying a radial acting force to the lining pipe body 20, and allowing the lining pipe body 20 and the screen pipe body 1 to maintain an interference fit, so that the lining pipe body 20 is more firmly fixed in the screen pipe body 1, and simultaneously, the sealing performance between the lining pipe body 20 and the screen pipe body 1 can also be improved, and it is ensured that all the screen holes 10 on the screen pipe body 1 are temporarily plugged by the soluble lining pipe 2. When temporary plugging of the screen is required, a tool can be put into the tubing 41 to puncture the air bag 23, or a well pump can be used to inject well killing fluid into the well, so that the air bag 23 is pressed too much and breaks.
In the embodiment of the present disclosure, if the tensioning structure is disposed on the outer wall of the liner tube body 20, the tensioning structure may be a thermosetting expansion coating, and the thermosetting expansion coating covers the outer wall of the liner tube body 20 and is connected to the outer wall of the liner tube body 20 and the inner wall of the screen tube body 1. The thermosetting expansion coating is a liquid coating coated on the outer wall of the lining pipe body 20, and is cured after being heated, and the volume is increased to reduce the gap between the lining pipe body 20 and the screen pipe body 1, so that the lining pipe body 20 and the screen pipe body 1 keep interference fit.
By applying the thermosetting expansion coating on the outer wall of the lining pipe body 20, after the lining pipe body 20 is inserted into the screen pipe body 1, the thermosetting expansion coating is also contacted with the inner wall of the screen pipe body 1, i.e. the thermosetting expansion coating is sandwiched between the lining pipe body 20 and the screen pipe body 1. After the thermosetting expansion coating is heated, the thermosetting expansion coating can be cured between the lining pipe body 20 and the screen pipe body 1, and the thermosetting expansion coating is connected with the outer wall of the lining pipe body 20 and the inner wall of the screen pipe body 1, so that the gap between the lining pipe body 20 and the screen pipe body 1 is further reduced, the friction force between the outer wall surface of the lining pipe body 20 and the inner wall surface of the screen pipe body 1 is increased, and the lining pipe body 20 is more firmly fixed in the screen pipe body 1. Meanwhile, the sealing performance between the lining pipe body 20 and the screen pipe body 1 can be improved, and all the screen holes 10 on the screen pipe body 1 can be temporarily blocked by the soluble lining pipe 2.
Illustratively, the thermosetting intumescent coating may be an epoxy layer or a polyimide layer. The outer wall of the lining pipe body can be coated with a film layer of epoxy resin or polyimide with the thickness of 1mm to 2mm, then the lining pipe body is placed into the screen pipe body 1, and the film layer of the epoxy resin or polyimide is solidified by heating the screen pipe body 1.
In the embodiment of the disclosure, before the temporary plugging screen pipe is put into the well, a thermosetting expansion coating may be coated on the outer wall of the inner lining pipe body 20, then the inner lining pipe body 20 is inserted into the screen pipe body 1, and before the temporary plugging screen pipe is put into the well, the temporary plugging screen pipe is heated, so that the thermosetting expansion coating on the inner lining pipe body 20 is cured, thereby further reducing the gap between the inner lining pipe body 20 and the screen pipe body 1, and more firmly fixing the inner lining pipe body 20 in the screen pipe body 1. Meanwhile, the sealing performance between the lining pipe body 20 and the screen pipe body 1 can be improved, and all the screen holes 10 on the screen pipe body 1 can be temporarily blocked by the soluble lining pipe 2.
FIG. 5 is a schematic diagram of a completion string provided by embodiments of the present disclosure. As shown in fig. 5, the completion string may include a tubing 41, a blind plugging guide shoe 42, a packer 43, and the temporary plugging screen G described above, wherein the blind plugging guide shoe 42, the temporary plugging screen G, and the tubing 41 are connected in sequence, and the packer 43 is sleeved outside the tubing 41.
Optionally, as shown in fig. 5, the completion string may further include a separation disc 3, one side of the separation disc 3 is connected to the plugging screen G, the other side of the separation disc 3 is connected to the oil pipe 41, and the separation disc 3 is configured to block a passage between the plugging screen G and the oil pipe 41 and fall off the plugging screen G when the pressure exceeds a set pressure.
The isolation disc 3 is located at the end of the temporary plugging sieve tube G, the end of the temporary plugging sieve tube G is plugged by the isolation disc 3, so that the killing fluid can be effectively prevented from entering the temporary plugging sieve tube G through the oil pipe 41, and the phenomenon that the killing fluid is contacted with the soluble lining pipe 2 to cause corrosion when the temporary plugging sieve tube G is not needed to be conducted temporarily is avoided. Moreover, the separation disc 3 can fall off from the temporary plugging sieve tube G when the pressure born by the separation disc exceeds the set pressure. That is, when the temporary plugging sieve tube G needs to be conducted, the pressure can be applied to the oil pipe 41 from the wellhead, so that the pressure borne by the separation disc 3 exceeds the set pressure, the separation disc 3 falls off from the temporary plugging sieve tube G, and the dissolving liquid can enter the temporary plugging sieve tube G and contact the soluble lining pipe 2 to dissolve the soluble lining pipe 2.
As shown in fig. 5, from bottom to top, the blind plugging guide shoe 42, the temporary plugging sieve tube G and the oil pipe 41 are sequentially connected, the blind plugging guide shoe 42 is located at one end of the temporary plugging sieve tube G, the other end of the temporary plugging sieve tube G is provided with the isolation disc 3, the isolation disc 3 is connected with one end of the oil pipe 41, and the outer wall of the oil pipe 41 is further sleeved with the packer 43, that is, the isolation disc 3 is located between the packer 43 and the temporary plugging sieve tube G.
The blind-plugging guide shoe 42 is a cone made of pig iron, cement or hardwood and mounted on the lowest end of the casing pipe 41. The blind guide shoe 42 can be used to prevent the bottom end of the oil pipe 41 and the casing from scratching or being inserted into the well wall, so as to guide the oil pipe 41 to the well bottom smoothly.
Wherein the packer 43 is a type of device having an elastomeric sealing element, the packer 43 may be placed over the tubing 41. When the packer is used, the packer 43 is enabled to generate elastic deformation and be tightly attached to the casing by pumping the well-killing fluid into the oil pipe 41, so that an annular space between the oil pipe 41 and the casing is sealed off to isolate a production zone, the oil is controlled to be sprayed out from the annular space, and a well completion string is protected.
The completion pipe column provided by the embodiment of the disclosure is provided with the temporary plugging sieve pipe, and in the process of running into the completion pipe column, all sieve holes 10 on the sieve pipe body 1 can be guaranteed to be temporarily plugged by the soluble lining pipe 2, so that the loss of a large amount of well killing fluid is avoided. When the temporary plugging screen pipe needs to be used, the dissolving liquid is injected into the temporary plugging screen pipe to dissolve the soluble lining pipe 2, so that the screen holes 10 on the screen pipe body 1 are communicated again.
FIG. 6 is a flow chart of a method of running a completion string provided by an embodiment of the present disclosure. As shown in fig. 6, the method of running the completion string comprises:
step S1: and controlling the well completion pipe string to run into the well to set the position.
The well completion pipe column needs to be put into a fracture-cavity type reservoir of a gas storage well, the pressure coefficient of the reservoir is 0.1, the well completion depth is 2600m, and the artificial bottom hole is 2550 m. And the well completion string comprises a blind plugging guide shoe 42, a temporary plugging sieve tube, a separation disc 3, an oil pipe 41, a packer 43 and a downhole safety valve from bottom to top in sequence. The outer diameter of the sleeve is 177.8mm, the inner diameter of the sleeve is 157mm, the outer diameter of the oil pipe 41 is 114.3mm, the outer diameter of the temporary plugging sieve pipe is 127mm, the inner diameter of the temporary plugging sieve pipe is 111.5mm, the setting pressure of the packer 43 is 20MPa, and the rupture pressure of the isolation disc 3 is 30 MPa.
Before step S1, the temporary plugging screen pipe may be assembled, and the soluble inner lining pipe 2 is inserted into the screen pipe body 1, so that the soluble inner lining pipe 2 completely plugs all the screen holes 10 on the screen pipe body 1, and the temporary plugging is formed on the screen pipe body 1.
In order to meet the natural gas flow area, the sum of the areas of all the sieve holes 10 on the sieve tube body 1 is not less than the cross-sectional area of the sieve tube body 1. Namely Ak＝nπr2≥As＝πR2Wherein A iskIs the total area of all the screen holes 10 on the screen body 1, AsIn order to temporarily block the cross-sectional area of the sieve tube, n is the total number of the sieve holes 10, R is the radius of the sieve holes 10, and R is the inner diameter of the temporarily blocked sieve tube.
Illustratively, the cross-sectional area A of the screen body 1sIs 9759.3mm2The diameter of the screen holes 10 is 6mm, and the area of each screen hole 10 is 28.26mm2Thus requiring at least 346 holes. The screen holes 10 on the screen pipe body 1 can adopt a spiral hole distribution mode, 16 screen holes are distributed in the range of every 1m in the axial direction of the screen pipe body 1, and the length of the screen pipe body is at least 22 m.
In step S1, the plugging screen in the completion string may be controlled to be run into a perforated zone in the well to run the completion string into a set position in the well.
Step S2: a solution is injected into the completion string from tubing 41.
The dissolving solution may be an acidic liquid, and for example, the dissolving solution may be a sulfuric acid solution. The acid liquid can dissolve the soluble lining pipe 2 on the inner wall of the screen pipe body 1, so that the screen holes 10 on the screen pipe body 1 are communicated.
Step S2 may include: solution with the volume not less than the inner cavity volume of the screen body 1 is injected into the completion string from the oil pipe 41.
Therefore, the dissolving liquid injected into the completion string by the pump can be ensured to completely fill the temporary plugging sieve tube, so that the soluble lining tube 2 can be completely soaked by the dissolving liquid, and the dissolving speed of the soluble lining tube 2 is accelerated.
Illustratively, the screen body 1 has an inner cavity volume of 0.21m3In the process of putting the well completion string under pressure, 0.25m is pumped over the separating disc 33And the solution is retained in the oil pipe 41 through the separation disc 3 to be placed into the temporary plugging sieve pipe in advance to dissolve the soluble lining pipe 2.
Step S3: the packer 43 is set by pumping pressurized well fluid into tubing 41 to a first pressure within tubing 41.
In step S3, the first pressure may be the working pressure of the packer 43, that is, when the pressure in the oil pipe 41 reaches the working pressure of the packer 43, the packer 43 starts to deform and tightly fit the casing, so as to seal the annular space between the oil pipe 41 and the casing to isolate the producing zone.
After setting the packer 43, pumping well killing fluid into the annular space between the oil pipe 41 and the casing of the wellbore, controlling the pressure in the annular space to reach a third pressure, and checking the packer 43, wherein the third pressure is not more than the second pressure.
After the setting of the packer 43 is completed, it is also necessary to verify whether the plugging effect of the packer 43 is good, so that the packer 43 can be tested by pumping the well-killing fluid from the annular space between the tubing 41 and the casing.
Illustratively, after the completion string is in place, the packer 43 is staged from 20MPa in tubing 41, set and then tested by pressurizing 10MPa from the annulus between tubing 41 and the casing 43.
Step S4: and continuing pumping the well control fluid into the oil pipe 41 until the pressure in the oil pipe 41 is increased from the first pressure to the second pressure, so that the separation disc 3 falls off.
Illustratively, after setting packer 43, the completion string may continue to be pressurized from tubing 41 to 30MPa, causing isolation disc 3 to fall off the end of the diverting screen.
Step S5: the oil pipe 41 is plugged until the soluble liner pipe 2 is dissolved.
Step S5 may include pumping kill fluid from the wellhead and pushing the solution into the temporarily plugged screen pipe. And then, closing the well and observing for 36 hours, wherein the dissolving time of the soluble lining pipe 2 is 24 hours, and after the soluble lining pipe is completely dissolved, the sieve holes 10 on the sieve pipe body 1 are exposed to communicate the channel between the reservoir and the completion pipe string. The well may then be opened and pumped with a quantity of kill fluid to flush the soluble liner 2 of residual solute.
And after the step S5, a liquid discharge test can be carried out to organize the production.
Although the present disclosure has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the disclosure.
Claims (10)
1. A plugging screen, comprising:
the sieve tube comprises a sieve tube body (1), wherein the outer wall of the sieve tube body is provided with a plurality of sieve holes (10) which are distributed circumferentially;
the soluble lining pipe (2) is coaxially inserted into the sieve tube body (1), the outer wall of the soluble lining pipe (2) is in sealing fit with the inner wall of the sieve tube body (1), and the soluble lining pipe (2) covers all the sieve holes (10) in the sieve tube body (1).
2. The temporary plugging screen of claim 1, wherein the soluble liner pipe (2) comprises a liner pipe body (20) and a tensioning structure, the liner pipe body (20) is coaxially located within the screen body (1), and the tensioning structure is located inside or outside the liner pipe body (20) so as to maintain the liner pipe body (20) and the screen body (1) in interference fit.
3. The temporary plugging screen pipe according to claim 2, wherein the tensioning structure comprises a first tensioning ring (21) and a second tensioning ring (22), the first tensioning ring (21) is in threaded connection with the second tensioning ring (22), and the first tensioning ring (21) is coaxially inserted into the lining pipe body (20);
the inner wall surface of the first tensioning ring (21) and the outer wall surface of the second tensioning ring (22) are both conical surfaces;
or the tensioning structure comprises an air bag (23).
4. The temporary plugging screen pipe according to claim 2, wherein the tensioning structure is a thermosetting expansion coating, and the thermosetting expansion coating covers the outer wall of the lining pipe body (20) and is connected with the outer wall of the lining pipe body (20) and the inner wall of the screen pipe body (1).
5. Temporary plugging screen according to any of claims 1 to 4, characterized in that the sum of the areas of all the screen openings (10) on the screen body (1) is not less than the cross-sectional area of the screen body (1).
6. A completion string, characterized in that it comprises an oil pipe (41), a blind plugging guide shoe (42), a packer (43) and a temporary plugging screen according to any one of claims 1 to 5, said blind plugging guide shoe (42), said temporary plugging screen and said oil pipe (41) being connected in sequence, said packer (43) being sleeved outside said oil pipe (41).
7. The completion string according to claim 6, further comprising a spacer disc (3), one side of the spacer disc (3) being connected to the plugging screen and the other side of the spacer disc (3) being connected to the tubing (41).
8. A method of running a completion string, adapted for use with the completion string of claim 7, the method comprising:
controlling the completion string to be lowered into the well to a set position;
injecting a solution from the tubing into the completion string;
pumping a well killing fluid into the oil pipe until the pressure in the oil pipe reaches a first pressure, and setting the packer;
continuing to pump the well killing fluid into the oil pipe until the pressure in the oil pipe is increased from the first pressure to a second pressure, so that the isolation disc falls off;
and plugging the oil pipe until the soluble lining pipe is dissolved.
9. The method of running in accordance with claim 8, wherein said setting said packer thereafter comprises:
and pumping the well killing fluid into an annular space between the oil pipe and a casing of the shaft, controlling the pressure in the annular space to reach a third pressure, and checking the seal of the packer, wherein the third pressure is not more than the second pressure.
10. The method of running in accordance with claim 8, wherein said plugging said tubing until after said soluble liner tube dissolves comprises:
and pumping the killing fluid into the oil pipe to flush the residual dissolved matters in the sieve tube body.
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| CN202010886906.3A CN111980638B (en) | 2020-08-28 | 2020-08-28 | Temporary plugging sieve tube, well completion pipe string and running method of well completion pipe string |
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| CN202010886906.3A CN111980638B (en) | 2020-08-28 | 2020-08-28 | Temporary plugging sieve tube, well completion pipe string and running method of well completion pipe string |
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Cited By (3)
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| CN115110994A (en) * | 2021-03-18 | 2022-09-27 | 中国石油化工股份有限公司 | Cavity forming device and method for salt cavern gas storage |
| CN115306354A (en) * | 2022-10-09 | 2022-11-08 | 四川圣诺油气工程技术服务有限公司 | Temporary plugging type liner tube for under-pressure pressing |
| CN117514088A (en) * | 2024-01-05 | 2024-02-06 | 四川圣诺油气工程技术服务有限公司 | Method for pressing long screen pipe under pressure |
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| CN111980638B (en) | 2022-07-05 |
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