CN113107415A

CN113107415A - Downhole packer system capable of being effectively sealed

Info

Publication number: CN113107415A
Application number: CN202110561848.1A
Authority: CN
Inventors: 吴帮民
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-05-23
Filing date: 2021-05-23
Publication date: 2021-07-13

Abstract

The invention provides an underground packer system capable of being effectively sealed, and relates to the technical field of packers. The underground packer system capable of being effectively sealed comprises an oil conveying pipe, a perforator, a spacing pipe and a sleeve, wherein the oil conveying pipe, the perforator, the spacing pipe and the end parts of the sleeve are connected through threads, an internal packer is arranged inside the oil conveying pipe, and a sleeve coupling positioner is fixedly arranged on the outer side of the sleeve. The invention provides an effectively-sealed underground packer system which can effectively improve the reliability of deep-hole hydrofracturing ground stress, can meet the steam injection requirement of a thermal recovery steam injection well, ensures that long-time steam injection sealing does not fail, has strong sealing capability, can effectively prevent sand production of a steam huff-and-puff well, prolongs the huff-and-puff frequency of an oil well, improves the recovery ratio, and also solves the problems that the oil well production cannot be normally carried out due to formation sand production in the thermal recovery production process of a heavy oil well, and even a well-lying state occurs so that well repair operation has to be frequently carried out.

Description

Downhole packer system capable of being effectively sealed

Technical Field

The invention relates to the technical field of packers, in particular to an underground packer system capable of being effectively sealed.

Background

The packer is widely applied to operations such as well drilling, well cementing, testing, well completion and the like, and is also used for underground petroleum operation, the packer is used for layering in an oil production project, an oil production channel is designed on the packer, when in setting, the piston sleeve ascends, the oil production channel is opened, after the setting, the upper pressure acts on the balance piston to push the rubber sleeve upwards, so that the deblocking pin is prevented from shearing force, when in deblocking, the deblocking pin is sheared by the friction force of the rubber sleeve and the sleeve, and the piston sleeve descends to close the oil production channel.

In the process of sealing the pipeline by the packer, the rubber tube needs to be extruded, the diameter of the rubber tube is expanded outwards so as to seal the pipeline, but the rubber tube can deform after being extruded for a long time, so that the rubber tube can not restore to the original shape, the rubber tube can always keep the expanded state, the packer can not be unsealed smoothly, moreover, the existing packer adopts a hydraulic mode for sealing, the sealing structure is complex, the situation of sealing failure is easy to occur, and when the packer is applied to the measurement of the hydraulic fracture ground stress of the drill hole, as the whole pressure-resistant capacity of the underground packer system needs to be continuously improved along with the increase of the testing depth, the pressure requirement of the deep hole hydraulic fracturing ground stress test can be met, however, the existing packer system cannot meet the strength requirement in the deep-hole hydrofracturing ground stress test process, and the reliability and the test efficiency of the deep-hole hydrofracturing ground stress test system are reduced.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides an underground packer system capable of effectively sealing, which solves the problems that the existing packer is easy to have problems during sealing use, the sealing structure is complex, the sealing failure is easy to occur, and the existing packer system cannot meet the strength requirement in the deep-hole hydraulic fracturing ground stress test process.

(II) technical scheme

In order to achieve the purpose, the invention is realized by the following technical scheme: the utility model provides a can effectively sealed packer system in pit, includes defeated oil pipe, perforator, spacer pipe and sleeve pipe, connect through the screw thread between each tip of defeated oil pipe, perforator, spacer pipe and sleeve pipe, the intraduct packer that is provided with of defeated oil pipe, the fixed sleeve pipe coupling locator that is provided with in the sleeve pipe outside.

Preferably, the end part of the oil conveying pipe is in threaded connection with an upper joint, and one end of the oil conveying pipe, which is far away from the upper joint, is in threaded connection with a lower joint.

Preferably, the outer sleeve is fixedly arranged on the outer side of the oil conveying pipe, a sliding groove is fixedly formed in one end, close to the upper joint, of the inner side of the outer sleeve, and an inner sliding sleeve is slidably arranged inside the sliding groove.

Preferably, a fracturing hole is fixedly formed in the outer wall of the oil delivery pipe close to the inner sliding sleeve, and a pressure activating hole is fixedly formed in the inner part of the oil delivery pipe close to the fracturing hole.

Preferably, the end part of the inner sliding sleeve is fixedly provided with a shearing pin, and the lower end of the shearing pin is inserted into the outer wall of the oil delivery pipe.

Preferably, one end of the outer sleeve, which is close to the lower joint, is fixedly provided with a pressure balancing hole.

Preferably, the downhole packer system comprises one application mode: the oil well is internally and fixedly provided with an oil production pipe, the outer side of the end part of the oil production pipe is fixedly provided with a lower sand prevention packer, the end part of the oil production pipe is fixedly provided with a metal sand stopper, and the outer wall of the upper end of the oil production pipe is fixedly provided with an upper packer.

Preferably, go up packer and sand control packer down and all include cone, metal seal anchor and cone down, metal seal anchor both ends all are fixed and are provided with the connection end, the lower tip of going up the cone and the upper end of cone down do not pass through two upper and lower connection end threaded connection of connecting thread and metal seal anchor.

Preferably, the upper packer and the lower sand prevention packer are both metal packers, and the metal sealing anchor is made of elastic alloy.

One application of the downhole packer system includes the following installation steps:

s1, firstly, completing the assembly of an underground sealing structure, and then connecting the assembled underground sealing structure to the lower part of a setting pipe column;

s2, setting the underground sealing structure into a designed position in the well, inserting the metal sand stopper into a sand prevention top packer, then implementing setting operation of the metal packer, and pulling out a setting pipe column after setting of the metal packer is completed;

s3, then, putting in a steam injection pipe column, and butting and sealing with a metal packer;

and S4, finally performing steam injection operation to complete thermal recovery of the oil field.

(III) advantageous effects

The invention provides a downhole packer system which can be effectively sealed. The method has the following beneficial effects:

1. the invention provides an effectively sealed underground packer system, which is applied to drilling hydraulic fracturing ground stress, and is characterized in that an underground combined tool (an in-pipe packer, a sleeve coupling positioner and the like) is lowered through a continuous oil pipe, the packer stays below a sliding sleeve after positioning, the in-pipe packer is pressed and set in the continuous oil pipe and an annular space, the annular space is pressed continuously until a shearing pin is cut, the sliding sleeve moves downwards to open the sliding sleeve, fracturing construction operation is started, the packer is unset, the continuous oil pipe is lifted up or lowered down, a next section of sliding sleeve is opened until fracturing construction operation is completed, the fracturing condition with large discharge capacity and high sand ratio can be met, and the reliability of the hydraulic fracturing ground stress is greatly improved.

2. The invention provides an underground packer system capable of being effectively sealed, wherein the packer used by the system adopts an all-metal sealing structure, can meet the steam injection requirement of a thermal recovery steam injection well, ensures that the steam injection seal does not lose efficacy for a long time, has strong sealing capability, can effectively prevent sand production of a steam huff-and-puff well, prolongs the huff-and-puff frequency of an oil well, improves the recovery ratio, and also solves the problems that the oil well production cannot be normally carried out due to formation sand production in the thermal recovery production process of a heavy oil well, and even a well-lying state occurs, so that well repair operation has to be frequently carried out, and the heavy oil recovery operation cost is increased.

3. The invention provides an effectively-sealed underground packer system which can prevent an oil well from seriously producing sand in the thermal recovery process of thick oil, minimize the influence of the sand production on the oil well, avoid the phenomenon of sand prevention sealing failure in the long-time steam injection process, have better sealing property and better using effect and effectively improve the reliability of oil extraction of the oil well.

Drawings

FIG. 1 is a schematic view of the connecting piping structure of the present invention;

FIG. 2 is a schematic view of the internal structure of the oil transportation pipe according to the present invention;

FIG. 3 is a schematic illustration of the installation of one embodiment of the packer of the present invention;

fig. 4 is a schematic structural diagram of a metal packer of the present invention.

Wherein, 1, an oil delivery pipe; 2. a perforator; 3. a spacer tube; 4. a sleeve; 5. a packer inside the pipe; 6. a casing collar locator; 7. an upper joint; 8. a pressure activated hole; 9. fracturing the hole; 10. an inner sliding sleeve; 11. shearing the pin; 12. a chute; 13. an outer sleeve; 14. a pressure balancing hole; 15. a lower joint; 16. an oil well; 17. an upper packer; 18. a production string; 19. setting a sand prevention packer; 20. a metal sand stopper; 21. an upper cone; 22. a metal seal anchor; 23. a lower cone; 24. connecting the end heads; 25. and connecting threads.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example (b):

as shown in fig. 1 to 4, an embodiment of the present invention provides an effectively sealable downhole packer system, which includes an oil pipeline 1, a perforator 2, a spacer pipe 3, and a casing 4, where the oil pipeline 1, the perforator 2, the spacer pipe 3, and each end of the casing 4 are connected by a thread, an in-pipe packer 5 is disposed inside the oil pipeline 1, and a casing collar locator 6 is fixedly disposed outside the casing 4.

The end part of the oil delivery pipe 1 is connected with an upper joint 7 through threads, and one end of the oil delivery pipe 1, which is far away from the upper joint 7, is connected with a lower joint 15 through threads.

An outer sleeve 13 is fixedly arranged on the outer side of the oil delivery pipe 1, a sliding groove 12 is fixedly formed in one end, close to the upper joint 7, of the inner side of the outer sleeve 13, and an inner sliding sleeve 10 is slidably arranged inside the sliding groove 12.

The outer wall of the oil delivery pipe 1 is fixedly provided with a fracturing hole 9 near the inner sliding sleeve 10, and the inner part of the oil delivery pipe 1 is fixedly provided with a pressure activating hole 8 near the fracturing hole 9.

The end part of the inner sliding sleeve 10 is fixedly provided with a shearing pin 11, and the lower end of the shearing pin 11 is inserted into the outer wall of the oil conveying pipe 1.

One end of the outer sleeve 13 close to the lower joint 15 is fixedly provided with a pressure balancing hole 14.

Transfer and instrument such as intraductal packer, sleeve pipe coupling locator make up through coiled tubing, the packer stops in the sliding sleeve below after the location, to the packer in coiled tubing and the annular space of beating setting, continue the annular space and beat to cutting off the pin, the inner sliding sleeve moves down and opens the sliding sleeve, begins fracturing construction operation, the deblocking packer lifts or transfers coiled tubing, opens next section sliding sleeve, until accomplishing whole well casing fracturing construction.

The downhole packer system comprises an application mode: the application mode comprises an oil well 16, an oil production pipe 18 is fixedly arranged in the oil well 16, a lower sand prevention packer 19 is fixedly arranged on the outer side of the end part of the oil production pipe 18, a metal sand stopper 20 is fixedly arranged on the end part of the oil production pipe 18, and an upper packer 17 is fixedly arranged on the outer wall of the upper end of the oil production pipe 18.

The upper packer 17 and the lower sand control packer 19 both comprise an upper cone 21, a metal seal anchor 22 and a lower cone 23, connecting ends 24 are fixedly arranged at both ends of the metal seal anchor 22, and the lower end part of the upper cone 21 and the upper end part of the lower cone 23 are in threaded connection with the upper connecting end 24 and the lower connecting end 24 of the metal seal anchor 22 through connecting threads 25 respectively.

The upper packer 17 and the lower sand control packer 19 are both metal packers, and the metal seal anchor 22 is made of an elastic alloy.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a can effectively sealed packer system in pit, includes oil pipeline (1), perforator (2), spacer tube (3) and sleeve pipe (4), its characterized in that: defeated oil pipe (1), perforator (2), spacer pipe (3) and sleeve pipe (4) are connected through the screw thread between each tip, defeated oil pipe (1) inside is provided with intraductal packer (5), sleeve pipe (4) outside is fixed and is provided with sleeve pipe coupling locator (6).

2. An effectively sealable downhole packer system as defined in claim 1, wherein: defeated oil pipe (1) tip threaded connection has top connection (7), defeated oil pipe (1) keeps away from one end threaded connection of top connection (7) has lower clutch (15).

3. An effectively sealable downhole packer system as defined in claim 1, wherein: the outer sleeve (13) is fixedly arranged on the outer side of the oil delivery pipe (1), a sliding groove (12) is fixedly formed in one end, close to the upper joint (7), of the inner side of the outer sleeve (13), and an inner sliding sleeve (10) is arranged inside the sliding groove (12) in a sliding mode.

4. An effectively sealable downhole packer system as defined in claim 1, wherein: the oil delivery pipe is characterized in that a fracturing hole (9) is fixedly formed in the outer wall of the oil delivery pipe (1) close to the inner sliding sleeve (10), and a pressure activating hole (8) is fixedly formed in the oil delivery pipe (1) close to the fracturing hole (9).

5. An effectively sealable downhole packer system as defined in claim 3, wherein: the end part of the inner sliding sleeve (10) is fixedly provided with a shearing pin (11), and the lower end of the shearing pin (11) is inserted into the outer wall of the oil conveying pipe (1).

6. An effectively sealable downhole packer system as defined in claim 3, wherein: one end of the outer sleeve (13) close to the lower joint (15) is fixedly provided with a pressure balancing hole (14).

7. An effectively sealable downhole packer system as defined in claim 1, wherein: the downhole packer system comprises an application mode: the application mode comprises an oil well (16), wherein an oil production pipe (18) is fixedly arranged in the oil well (16), a lower sand prevention packer (19) is fixedly arranged on the outer side of the end part of the oil production pipe (18), a metal sand stopper (20) is fixedly arranged on the end part of the oil production pipe (18), and an upper packer (17) is fixedly arranged on the outer wall of the upper end of the oil production pipe (18).

8. An effectively sealable downhole packer system as defined in claim 7, wherein: go up packer (17) and sand control packer (19) down and all include cone (21), metal seal anchor (22) and lower cone (23), metal seal anchor (22) both ends are all fixed and are provided with connection end (24), go up the lower tip of cone (21) and the upper end of lower cone (23) and do not pass through two upper and lower connection end (24) threaded connection of connecting thread (25) and metal seal anchor (22).

9. An effectively sealable downhole packer system as claimed in claim 7 or 8, wherein: go up packer (17) and sand control packer (19) down and be metal packer, metal seal anchor (22) are formed by elastic alloy preparation.

10. An effectively sealable downhole packer system as defined in claim 7, wherein: one application of the downhole packer system includes the following installation steps: