CN211038596U - High-strength soluble temporary plugging perforated sieve tube - Google Patents
High-strength soluble temporary plugging perforated sieve tube Download PDFInfo
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- CN211038596U CN211038596U CN201922282794.6U CN201922282794U CN211038596U CN 211038596 U CN211038596 U CN 211038596U CN 201922282794 U CN201922282794 U CN 201922282794U CN 211038596 U CN211038596 U CN 211038596U
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Abstract
The utility model discloses a soluble temporary plugging perforated sieve tube of high strength, belongs to the technical field of well completion engineering, and comprises a base tube and a composite hole plug, wherein the base tube is uniformly provided with a plurality of holes on the tube body thereof, the inner wall of each hole is provided with an internal thread, the composite hole plug is arranged in each hole, the composite hole plug seals the hole of the base tube, and the outer wall of a plug seat is provided with an external thread and is matched with the corresponding hole plug; the composite plug hole is composed of a plug seat and a soluble plug, a through hole is formed in the inner side of the composite plug hole, and the soluble plug is fixed in the composite plug hole. The utility model discloses factor of safety that can effectual improvement well completion screen pipe adapts to bigger well pressure, and the later stage of being convenient for simultaneously is clear away to can satisfy installation and the processing demand to compound stopple under the different conditions.
Description
Technical Field
The utility model relates to a well completion engineering technical field specifically is a soluble stifled screen pipe that punches of high strength.
Background
In the process of petroleum drilling, in order to prevent the drilling fluid from leaking into the stratum, solid-phase particles, polymers and other substances in the drilling fluid can form mud cakes on the wall of a well, and free water of the drilling fluid is prevented from entering the stratum. However, after the well is drilled, if the mud cakes can not be effectively removed, rock pores on the well wall can be blocked, the permeability of a reservoir layer is reduced, the flow resistance of oil and gas is increased, and the yield of the oil and gas is reduced. Therefore, technical measures are required to remove the mud cake contamination during the completion process. For cased hole completions, the mud cake contamination zone may be perforated by perforations to remove contamination. For screen pipe well completion, a special flushing pipe column is required to be inserted into the screen pipe for circular well flushing, and the flushing pipe column is taken out after well flushing is completed. The process is generally only used for low-pressure oil and gas wells, and faces a plurality of limitations in deep high-pressure oil and gas wells: (1) in the process of flushing the pipe column, due to the suction effect of the pipe column, the risk of overflow and even blowout exists; (2) the high-density solid-free completion fluid is needed to be adopted for well washing and slurry replacement, so that the cost is high; (3) the construction is complicated, the working period is long, and the working cost is high. In order to solve the problem of replacing slurry of a horizontal well, Chinese patent CN101718189A discloses a well completion and flushing process with a temporary plugging sand control screen pipe and a matched well. The temporary plugging sieve tube designed in the patent adopts a plugging structure to plug the base tube hole, and after the sieve tube is put into a shaft, a drilling and milling tool is adopted to drill or shear the plugging and remove the plugging, so that the inside and the outside of the sieve tube are recovered to be communicated. There are problems in that: the drill rod needs to be independently drilled next time, so that the operation process and the operation cost are increased; the well killing is still needed in the operation process of drilling and removing the plugging, and the reservoir and the sieve tube are damaged again.
Therefore, the prior art still can not effectively solve the problem of replacing slurry and washing the deep high-pressure oil-gas horizontal well. The deep carbonate horizontal well of the Tarim basin is generally completed by a screen pipe, and the solid phase content in the drilling fluid is high, the completion period is long, the solid phase settlement in the drilling fluid causes serious reservoir pollution, and the influence on the yield is great. At present, no suitable technique for removing the mud cake of drilling fluid is available.
SUMMERY OF THE UTILITY MODEL
To the above problem, the utility model provides a soluble stifled screen pipe that punches of high strength temporarily, its factor of safety that can effectual improvement well completion screen pipe adapts to bigger well pressure, and the later stage of being convenient for simultaneously is clear away to can satisfy installation and the processing demand to compound stopple under the different situation.
The technical scheme of the utility model as follows:
a high-strength soluble temporary plugging perforated sieve tube consists of a base tube and a composite hole plug, wherein the base tube is uniformly provided with a plurality of holes on the tube body, the inner walls of the holes are provided with internal threads, the composite hole plug is arranged in the holes and seals the holes of the base tube, and the outer wall of a plug seat is provided with external threads and matched with the hole plug; the composite plug hole is composed of a plug seat and a soluble plug, a through hole is formed in the inner side of the composite plug hole, and the soluble plug is fixed in the composite plug hole.
Further, the hole is cylindrical, the outer surface of the hole plug is cylindrical, the inner surface of the hole plug is conical, and the inner surface of the soluble plug is conical.
Furthermore, the eyelet is cylindrical, the outer surface of the eyelet plug is cylindrical, the inner surface of the eyelet plug is conical, a circle of groove protruding outwards is formed in the small end of the cone, the inner surface of the soluble plug is conical, a circle of flange protruding outwards is formed in the small end of the cone, and the flange of the soluble plug is matched with the groove of the cone.
Further, the hole is conical, the outer surface of the hole plug is conical, the inner surface of the hole plug is conical opposite to the outer surface, the inner surface of the soluble plug is conical, and a flange of the soluble plug is matched with a groove of the cone.
Furthermore, the size of each eyelet is 1-3 cm, the hole density is 5-40 holes/m, the hole density in the length direction is described here, and the number of the eyelets is 4-8 on the horizontal ring surface.
The utility model discloses an useful part lies in:
(1) the perforated base pipe is temporarily sealed by adopting the soluble plug, the requirement of replacing slurry and washing the well in the well completion of the horizontal well screen pipe is met, the overflowing capacity of the base pipe can be recovered after the soluble plug is dissolved, the production requirement is met, and meanwhile, the perforated screen pipe can support the well wall; compared with the existing horizontal well slurry replacing well washing process, the screen pipe well completion pipe column formed by the utility model has the advantages of simpler slurry replacing well washing, lower risk and suitability for deep high-pressure oil and gas wells;
(2) the soluble plug adopts a conical structure and is in interference fit with the conical surface of the plug seat, and the conical surface of the soluble plug and the conical surface of the plug seat are pressed more and more tightly through the pressure sealing assistance in the pipe, so that the internal pressure resistance of the soluble temporary plugging perforated screen pipe is improved, and the requirement of forward slurry replacement well washing is met;
(3) the composite hole plug design of soluble plug and stopper seat combination, composite hole plug simple structure, soluble plug and stopper seat interference fit, through the press directly with the soluble plug impress the stopper seat in, just can process into composite hole plug, install composite hole plug on the parent tube again, with the help of the stopper seat, conveniently will have the soluble plug of toper structure to install on the parent tube, processing technology is very simple, low in manufacturing cost. And provides multiple configurations to facilitate the processing and installation requirements under different circumstances.
Drawings
FIG. 1 is a schematic diagram of a soluble temporary plugging perforated screen provided in accordance with the first and second embodiments;
FIG. 2 is a schematic diagram of a composite plug according to an embodiment;
FIG. 3 is a schematic diagram of a composite plug according to the second embodiment;
FIG. 4 is a schematic diagram of a composite plug according to a third embodiment;
FIG. 5 is a schematic representation of a frac completion string using a high strength soluble temporary plugging perforated screen as provided in examples one, two and three.
The figures are labeled as follows:
1 base pipe, 2 composite hole plugs, 2101 plug seat I, 2102 soluble plug I, 2201 plug seat II, 2202 soluble plug II, 2301 plug seat I, 2302 soluble plug III,
11-releasing device, 12-blind pipe, 13-soluble temporary plugging perforated screen pipe and 14-guide shoe.
Detailed Description
The present invention will be further explained with reference to the drawings and examples.
As shown in figure 1, a soluble temporary plugging perforated screen is installed in a well completion screen, the lower part of the screen is provided with a guide shoe 14, and the upper part of the screen is provided with a blind pipe 12 and a release 11 respectively.
Example one
As shown in figure 2, the soluble temporary plugging perforated sieve tube consists of a base tube 1 and a composite hole plug 2, wherein a plurality of holes are uniformly drilled on the body of the base tube 1, internal threads are arranged on the inner wall of each hole, the size of each hole is 1-3 cm, and the hole density is 5-40 holes/meter. The composite plug 2 consists of a plug seat one 2101 and a soluble plug one 2102. The plug seat 2101 is the cylinder structure, and the outer wall sets up the external screw thread, and the external screw thread cooperatees with the internal thread of punchhole inner wall. The plug seat one 2101 is internally provided with a conical through hole. Fusible plug one 2102 is a cone structure. The soluble plug one 2102 fits into the plug holder one 2101 and is held together by an interference fit, making up the composite hole plug 2. The composite hole plug 2 is fixedly installed in the hole of the base pipe 1 through threads, the lower part of the soluble plug one 2102 is positioned on the inner side of the base pipe 1, and the upper part of the soluble plug one 2102 is positioned on the outer side of the base pipe 1.
The base tube 1 and the plug seat I2101 are made of steel materials. The soluble plug 2102 is made of a material which can be dissolved by a chemical solvent, and specifically can be made of magnesium aluminum alloy.
This embodiment is installed in a horizontal well screen completion string, as shown in figure 4, run into the wellbore. The well washing liquid is positively replaced into the oil pipe, and the soluble temporary plugging perforated sieve pipe is in a closed state, so that the well washing liquid can displace mud in a shaft and effectively wash mud cakes on the wall of the well. In the flushing process, a certain pressure is born in the pipe column, and the soluble plug 2102 has a cone structure, so that under the action of pressure sealing assistance in the pipe, the cone surface of the soluble plug 2102 and the plug seat 2101 is pressed more and more tightly, the soluble plug is prevented from falling off, and the internal pressure resistance of the soluble temporary plugging perforated screen pipe is improved. After the well is flushed, acid liquor is squeezed and injected, the soluble plug 2102 is dissolved, the perforated sieve tube recovers the flow channel, and oil gas enters the oil pipe through the sieve tube holes.
Example two:
as shown in figure 3, the soluble temporary plugging perforated sieve tube consists of a base tube 1 and a composite hole plug 2, wherein a plurality of holes are uniformly drilled on the body of the base tube 1, internal threads are arranged on the inner wall of each hole, the size of each hole is 1-3 cm, and the hole density is 5-40 holes/meter. The composite hole plug 2 is composed of a second plug seat 2201 and a second soluble plug 2202. The second plug seat 2201 is of a cylindrical structure, the outer wall of the second plug seat is provided with external threads, and the external threads are matched with the internal threads on the inner wall of the hole. The second plug seat 2201 is internally provided with a conical through hole, and the small end surface of the through hole is provided with an annular step expanding outwards. The second soluble plug 2202 is in a cone structure, and is provided with an annular flange expanding outwards on a small end face and matched with the annular step. The second soluble plug 2202 is installed in the second plug seat 2201 and is clamped and fixed together through interference fit to form the composite hole plug 2. The composite hole plug 2 is fixedly installed in the hole of the base pipe 1 through threads, the lower part of the second soluble plug 2202 is located on the inner side of the base pipe 1, and the upper part of the second soluble plug 2202 is located on the outer side of the base pipe 1.
The design is carried out, so that the soluble plug II 2202 and the plug seat II 2201 keep better fixing effect, and the soluble plug II 2202 is prevented from falling off the plug seat II 2201 in the well completion string running process. During processing, the thickness of the second soluble plug 2202 is larger than that of the second plug seat 2201, and because the material of the second soluble plug 2202 is soft, under the pressurization effect of the press, the part of the second soluble plug 2202, which protrudes out of the second plug seat 2201, deforms and is embedded into the concave step of the second plug seat 2201, so that the second soluble plug 2202 is fastened in the plug seat.
Example three:
as shown in figure 4, the soluble temporary plugging perforated sieve tube consists of a base tube 1 and a composite hole plug 2, wherein a plurality of holes are uniformly drilled on the body of the base tube 1, the holes are in a conical structure, internal threads are arranged on the inner wall of each hole, the size of each hole is 1-3 cm, and the hole density is 5-40 holes/meter. Composite plug 2 is comprised of a plug base three 2301 and a soluble plug three 2302. The third plug seat 2301 is a cone structure, the outer wall of the third plug seat is provided with external threads, and the external threads are matched with the internal threads of the inner wall of the eyelet. The plug seat three 2301 is internally provided with a conical through hole with the opposite conical orientation to the outside. Soluble plug three 2302 is a cone structure. Soluble plug three 2302 is installed in the plug base and held together by interference fit to make up the composite plug 2. The composite hole plug 2 is fixedly installed in the hole of the base pipe 1 through threads, the lower part of the soluble plug three 2302 is positioned on the inner side of the base pipe 1, and the upper part of the soluble plug three 2302 is positioned on the outer side of the base pipe 1.
The base tube 1 and the plug seat III 2301 are made of steel materials. The soluble plug three 2302 is made of a material which can be dissolved by a chemical solvent, and specifically can be made of magnesium aluminum alloy.
So design lets three 2301 of stopper seat adopt the toper structure, and three 2301 outer walls of stopper seat adopt the awl screw thread, and the advantage lies in: the more tightly the three plug seats 2301 and the base pipe 1 are screwed, the more in-place the plug seats are sealed by the taper threads, the dual functions of fixing and sealing can be achieved, the sealing pressure is high, and the sealing element does not need to be considered additionally.
The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiments, and although the present invention has been disclosed with the preferred embodiments, it is not limited to the present invention, and any skilled person in the art can make some modifications or equivalent embodiments without departing from the scope of the present invention, but all the technical matters of the present invention are within the scope of the present invention.
Claims (6)
1. A high-strength soluble temporary plugging perforated sieve tube is characterized by consisting of a base tube and a composite hole plug, wherein the base tube is uniformly provided with a plurality of holes on the tube body, the inner wall of each hole is provided with an internal thread, the composite hole plug is arranged in each hole, the composite hole plug seals the holes of the base tube, and the outer wall of a plug seat is provided with an external thread and matched with the corresponding hole plug;
the composite plug hole is composed of a plug seat and a soluble plug, a through hole is formed in the inner side of the composite plug hole, and the soluble plug is fixed in the composite plug hole.
2. The high strength soluble temporary plugging perforated screen pipe of claim 1, wherein said perforations are cylindrical, said plug outer surface is cylindrical, said inner surface is conical, and said soluble plug inner surface is conical.
3. A high strength soluble temporary plugging perforated screen according to claim 1 wherein said perforations are cylindrical, said plug outer surface is cylindrical and inner surface is conical and a ring of outwardly projecting slots is provided at the small end of the cone, said plug inner surface is conical and a ring of outwardly projecting flanges is provided at the small end of the cone, the flanges of the plug and the slots of the cone cooperate.
4. A high strength soluble temporary plugging perforated screen according to claim 1, wherein said perforations are conical, said plug outer surface is conical and inner surface is conical opposite to outer surface, said plug inner surface is conical, the flange of the plug and the groove of the cone cooperate.
5. The high-strength soluble temporary plugging perforated screen pipe according to any one of claims 2-4, wherein the easy plugging base is internally provided with a conical through hole, and the soluble plugs are arranged in the plugging base and fixed together through conical threads to form a composite hole plug.
6. The high-strength soluble temporary plugging perforated screen pipe according to any one of claims 2-4, wherein the perforation size is 1-3 cm and the hole density is 5-40 holes/m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922282794.6U CN211038596U (en) | 2019-12-18 | 2019-12-18 | High-strength soluble temporary plugging perforated sieve tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922282794.6U CN211038596U (en) | 2019-12-18 | 2019-12-18 | High-strength soluble temporary plugging perforated sieve tube |
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| Publication Number | Publication Date |
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| CN211038596U true CN211038596U (en) | 2020-07-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201922282794.6U Active CN211038596U (en) | 2019-12-18 | 2019-12-18 | High-strength soluble temporary plugging perforated sieve tube |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113232141A (en) * | 2021-04-21 | 2021-08-10 | 姚中杰 | Vacuum casting device and process for refractory material |
| 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 |
-
2019
- 2019-12-18 CN CN201922282794.6U patent/CN211038596U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113232141A (en) * | 2021-04-21 | 2021-08-10 | 姚中杰 | Vacuum casting device and process for refractory material |
| 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 |
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