CN201165866Y - Horizontal well separate mining and combined mining pipe column - Google Patents

Abstract

Disclosed is a separate and combined recovery pipe string for a horizontal well. In order to overcome the deficiency that the existing horizontal well layered production operation string cannot meet the needs of simultaneous exploitation of two oil layers, the utility model is equipped with a liner pipe string (30) in the wellbore, and a liner pipe string (30) is installed inside the liner pipe string (30). There are production pipe strings (40); blind plugs (23) of liner pipe strings (30), sand control screen II (22), packers (21), sealing cylinders (26), blind pipes (19), sand control Screen pipe I (17), packer (15), casing (14), liner hanger (8), and tie-back casing (2) are connected sequentially from bottom to top; the plug-in type of production string (40) Sealing device (20), tubing (18), ball seat (13), seating nipple (12), production sleeve (11), packer (10), and kill sleeve (9) are connected sequentially from bottom to top ; The plug-in sealing device (20) is located in the sealing cylinder (14) of the tail pipe string (30). The beneficial effect is that one string realizes the requirement of separate production/combined production of different oil layers.

Description

Horizontal well separate production combined production string

Technical field

The utility model relates to a horizontal well production pipe string for oil and gas development operations, in particular to a horizontal well separate production and combined production pipe string, which is also suitable for step horizontal well separate production and combined production pipe strings.

Background technique

In the Chinese utility model patent "Layered Sand Control Production Process Pipe String" published on October 27, 2004, the separate production pipe string under the packer is suspended in the horizontal well, and sand filter pipes and sand filter pipes are installed in the two oil production intervals respectively. Centralizers are installed at both ends of the pipe; the isolated layer in the middle of the two sand filter pipes is sealed by two bidirectional cup packers, and a control valve is installed between the two packers; Piston type, with the function of a check valve; the lower end of the pipe string is installed with a plug to plug the pipe string. By controlling the working state of the valve, this technology can realize the mining operations at both ends of the upper and lower mining, and the middle and middle mining. This technology requires cementing, perforating and other operations, the operation process is complicated, and the produced liquid flows out from the same oil pipe, which cannot meet the operation needs of simultaneous exploitation of two oil layers.

Utility model content

In order to overcome the shortcomings of the existing horizontal well layered mining operation strings, which are complicated in the operation process and unable to meet the needs of simultaneous exploitation of two oil layers, the utility model provides a horizontal well separate mining combined production string, which can be widely used in Separate production/combined production of horizontal wells and stepped horizontal wells.

The technical solution adopted by the utility model to solve the above-mentioned technical problems is: the horizontal well separate production combined production string includes casing, oil pipe, packer, sand control screen, blind plugging, casing cementing in the vertical well section, and the horizontal well section is For open hole wells, there are two production intervals in the horizontal well section, sand control screens are installed in the production intervals, blind plugs are installed at the end of the pipe string, and liner strings are installed in the wellbore. Production pipe string; blind plugging of liner pipe string, sand control screen II, packer, sealing cylinder, blind pipe, sand control screen I, packer, casing, liner hanger, tie-back casing from below connected in order from the top; the plug-in sealing device of the production string, the tubing, the ball seat, the seating pup, the production sleeve, the packer, and the kill sleeve are connected sequentially from bottom to top; the sand control screen I is located in the production layer I, and The screen pipe II is located in the production layer II; the plug-in sealing device is located in the sealing cylinder of the liner string.

The beneficial effects of the utility model are that the design is reasonable, the operation is convenient, and the work is reliable, and the mining operation is completed in one trip, which saves the operating cost of lifting and lowering the string; the mining of different oil layers is selected through the steel wire operation to meet the needs of separate mining/combined mining The operation needs of different oil layers; the hydraulic method is used to complete the setting and unsealing of the packer, which reduces the number of steel wire operations and reduces the difficulty of the operation.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the utility model horizontal well separate production combined production pipe string.

Fig. 2 is a schematic structural view of the separate production and combined production string of the stepped horizontal well according to the second embodiment of the utility model.

In the figure: 1. Oil pipe hanger, 2. Tie-back casing, 3. Safety valve control pipeline, 4. Safety valve assembly, 5. Oil pipe, 6. Casing, 7. Expansion joint, 8. Liner hanger, 9. Killing sleeve, 10. Packer, 11. Production sleeve, 12. Seat sub, 13. Ball seat, 14. Casing, 15. Packer, 16. Horizontal section, 17. Sand control Screen I, 18. Oil pipe, 19. Blind pipe, 20. Plug-in sealing device, 21. Packer, 22. Sand control screen II, 23. Blind plugging, 24. Production zone I, 25. Production zone II, 26. Sealing tube, 30. Liner pipe string, 31. Vertical well section, 32. Step horizontal well transition well section, 40. Production pipe string.

Detailed ways

Below in conjunction with accompanying drawing 1, accompanying drawing 2 and embodiment the utility model is further described.

The utility model horizontal well separate mining combined production pipe string includes casing 6, tubing 5, packer 10, sand control screen I17, sand control screen II22, blind plug 23, vertical well section 31 is cemented with casing 6, water The flat well section 16 is an open hole section; the horizontal well section 16 has two production intervals, namely production layer I24 and production layer II25; a liner string 30 is installed in the wellbore, and a production pipe string 40.

Blind plug 23 of liner pipe string 30, sand control screen II 22, packer 21, sealing cylinder 26, blind pipe 19, sand control screen I 17, packer 15, casing 14, liner hanger 8, back The connecting sleeves 2 are connected sequentially from bottom to top. The sand control screen I17 is located in the well section of the production layer I24, and the sand control screen II22 is located in the well section of the production layer II25. The tieback casing 2 is located in the vertical well section 31 , and a liner hanger 8 is installed on the tieback casing 2 . Packer 15 and packer 21 are preferably oil-swellable packers, which are convenient for sealing in the open-hole horizontal well section 16; packer 15 and packer 21 form the corresponding pay zone I The sealing annulus of 24 realizes the separation of production layers I 24 and II 25 from the annulus of vertical section 31.

The plug-in sealing device 20, tubing 18, ball seat 13, seating nipple 12, production sleeve 11, packer 10, and kill sleeve 9 of the production string 40 are connected sequentially from bottom to top. The plug-in sealing device 20 with a through hole in the middle is located in the sealing cylinder 14 of the liner pipe string 30, and its outer circle forms a seal with the inner hole of the sealing cylinder 14. The packer 10 at the upper part of 40 forms a sealed annulus corresponding to the production layer 124. The packer 10 can be an intubation hydraulic packer.

The top of the kill sleeve 9 of the production pipe string 40 is connected with the oil pipe 5, the safety valve assembly 4, and the safety valve control pipeline 3 in sequence from bottom to top, and the upper part of the pipe string is connected with the oil pipe hanger 1. An expansion joint 7 is installed on the upper part of the production pipe string 40 to compensate for the expansion and contraction of the length of the oil pipe due to changes in temperature and pressure.

Applying the utility model of horizontal well separate production and combined production pipe string operation, firstly, the liner pipe string 30 is lowered, and after it is in place, the casing 6 is cemented, connected back, and the slurry is replaced after the blanking plate (select the lower slurry replacement pipe according to the insertion of the sealing cylinder) tool); then run into the production pipe string 40, the plug-in sealing device 20 is inserted into the sealing cylinder 26 to form a seal; set the oil-expandable packer 15 and the oil-expandable packer 21 for light oil expansion, set The packer 10 is checked and sealed, and the well is opened for production.

During separate mining operations, close the production sliding sleeve 11, keep the diameter of the tubing 18, and carry out production layer II25 mining operation; put a plug into the pup joint 12, open the production sliding sleeve 11 with steel wire operation, and carry out production layer I24 mining Operation.

During the combined production operation, the steel wire operation takes out the plug, the oil pipe 18 to the upper oil pipe 5 is the through diameter, and the production sliding sleeve 11 is opened, so that the two production layers of production layer I 24 and production layer II 25 can be exploited simultaneously.

The utility model horizontal well separate production and combined production pipe string can not only be applied to the separate production and combined production of two production layers in ordinary horizontal wells, but also suitable for the mining operations of different production layers in stepped horizontal wells. The tubing 18 can be used at the transition section 32 of the stepped horizontal well.

The utility model has a reasonable design of the separate and combined mining pipe string for the horizontal well, the hydraulic packer has strong suspension ability, is permanently anchored, and has a long service life; single-trip operation, ball-seating sealing, hydraulic packer locking and sealing, and the upper tubing can be pulled out and in and out. Re-insert; oil-swellable packers and sand control screens can effectively achieve the purpose of sand control; one string operation saves the cost of lifting and lowering the string; the operation form of separate mining/combined mining can be selected through steel wire operation; hydraulic pressure is adopted This method completes the setting and unsealing of the packer, reduces the number of steel wire operations and reduces the difficulty of the operation, and can be widely used in separate/combined production of horizontal wells and stepped horizontal wells.

Claims (4)

1. a horizontal well branch is adopted to close and is adopted tubing string, comprise sleeve pipe, oil pipe, packer, sand control screen, blind plugging, straight well section casing cementing, net horizontal section is an open hole well, net horizontal section has 2 production ranges, and sand control screen is installed in the production range position, and the tubing string end is equipped with blind plugging, it is characterized in that: tail pipe pipe string (30) is installed in well, is equipped with in the tail pipe pipe string (30) and produces pipe string (40);

The blind plugging (23) of tail pipe pipe string (30), sand control screen II (22), packer (21), sealing drum (26), blind pipe (19), sand control screen I (17), packer (15), sleeve pipe (14), extension hanger (8), tie-back casing (2) connect from the bottom to top successively;

Produce pipe string (40) plug-in type sealing device (20), oil pipe (18), ball seat (13), be located pipe nipple (12), produce sliding sleeve (11), packer (10), kill-job sliding sleeve (9) and connect successively from the bottom to top;

Sand control screen I (17) is positioned at payzone I (24); Sand control screen II (22) is positioned at payzone II (25); Plug-in type sealing device (20) is positioned at the sealing drum (14) of tail pipe pipe string (30).

2. horizontal well branch according to claim 1 is adopted to close and adopted tubing string, it is characterized in that: described tie-back casing (2) is positioned at straight well section (31), and extension hanger (8) is installed on the tie-back casing (2).

3. horizontal well branch according to claim 2 is adopted to close and adopted tubing string, it is characterized in that: described packer (15), packer (21) are for meeting oily swell packers.

4. horizontal well branch according to claim 2 is adopted to close and adopted tubing string, it is characterized in that: described packer (10) is the cannula type hydraulic packer.

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