Multilateral well completion pipe string reentry leader

A completion string and guide technology, which is applied in the direction of wellbore/well components, earthwork drilling and production, etc., can solve the problem of inability to change and judge whether the completion string has passed the branch well window, etc., to achieve novel ideas and narrow Outer diameter, simple structure effect

Active Publication Date: 2013-01-30
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In order to solve the technical problems existing in the above-mentioned prior art, the present invention proposes a branch well completion pipe string reentry guide for oil and gas branch well downhole pipe string running and reentry guidance, and oil and gas recovery production. The invention is novel in concept and simple in structure, and solves the problem in the prior art that "when the completion string of a branch well is sent into the wellbore of the branch well, it is impossible to judge whether the completion string is The technical problem that the branch well window has been passed correctly, and the completion string of the branch well can be locked in the branch well after passing through the window, so as to ensure the smooth progress of the subsequent stimulation construction

Method used

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  • Multilateral well completion pipe string reentry leader

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Experimental program
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Effect test

Embodiment 1

[0030] The invention discloses a re-entry guide for a branch well completion pipe string, which comprises a center pipe, an upper body, a claw, a lower body, a horse tooth ring and an adjustment ring, the upper body is sleeved outside the center pipe and connected to the center pipe connected together, the lower body is sleeved outside the central tube and connected with the central tube, the upper end of the claw is a tapered claw structure, the claw is located between the upper body and the lower body, and the claw can Axially sliding between the upper body and the lower body, the horsetooth ring is arranged between the spring claw and the central pipe, and the adjusting ring is arranged below the horsetooth ring and between the spring claw and the central pipe. A reverse zigzag thread is provided at the position where the central tube cooperates with the claw, and is matched with the forward zigzag thread of the horsetooth ring. A step is provided on the outer wall of the c...

Embodiment 2

[0032] The invention discloses a reentry guide for a branch well completion pipe string, which consists of a center pipe 1, an upper body 2, a stabilizing nail 3, a spring claw 4, a lower body 5, a shearing nail 6, a horse tooth ring 7, and an adjustment ring 8. Stabilizing nail 2 consists of 9; from top to bottom center tube 1, upper body 2, stabilizing nail 1 3, spring claw 4, lower body 5, shear nail 6, horse teeth ring 7, adjustment ring 8, stabilizing nail 2 9 sequential connection.

[0033] The position where the central tube 1 and the claw 4 cooperate has a reverse zigzag thread, which can realize one-way jumping and reverse self-locking with the forward zigzag thread of the horse tooth ring 7; Part of the steps overlap, which limits the radial displacement of the claw 4 within a certain axial range (that is, the outer diameter of the claw 4 is reduced). When a certain amount of axial displacement occurs between the claw 4 and the central tube 1, The steps no longer ov...

Embodiment 3

[0036] Refer to the attached figure 1 , the best embodiment of the present invention is: the lower end of the central pipe 1 is connected with the guide shoe, and the upper end is connected with the completion string; The diameter is slightly larger than the outer diameter of the lower body 5 and slightly smaller than the outer diameter of the claw 4. The lower body 5 can enter the branch well window smoothly. When the claw 4 enters the branch well window, it will encounter resistance and cannot enter. At this time, continue to press down the completion pipe String, shearing nail 6 cut off, spring claw 4, horse tooth ring 7, adjustment ring 8 slide upwards in the direction of body 2, when the upper cone surface of spring claw 4 touches upper body 2, the coincidence between spring claw 4 and center tube 1 The steps have been staggered and the radial limit effect is lost, the outer diameter of the claw 4 shrinks and becomes smaller, and the claw 4 enters the window of the branch...

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Abstract

The invention discloses a multilateral well completion pipe string reentry leader which relates to the technical field of manufacturing of downhole tools of the petroleum and natural gas industries. The multilateral well completion pipe string reentry leader comprises a central pipe, an upper body, an elastic claw, a lower body, a horse tooth-shaped ring and an adjustment ring, wherein the upper body is sleeved outside the central pipe and connected with the central pipe together, and the lower body is sleeved outside the central pipe and connected with the central pipe together; the upper end of the elastic claw is of a conical elastic claw structure, and the elastic claw is positioned between the upper body and the lower body and can be axially slid between the upper body and the lower body; the horse tooth-shaped ring is arranged between the elastic claw and the central pipe; and the adjustment ring is arranged between the elastic claw and the central pipe below the horse tooth-shaped ring. The multilateral well completion pipe string reentry leader has the advantages of novel conception and simple structure, and the technical problem in the prior art that when the multilateral well completion pipe string is sent into a multilateral well hole, the completion pipe string cannot be correctly judged whether to pass through a multilateral well window in real time through the change of the suspending weight of the pipe string is solved.

Description

[0001] technical field [0002] The invention relates to the technical field of manufacturing downhole tools in the petroleum and natural gas industry, in particular to a reentry guide for a branch well completion pipe string, which is used for the running and reentry guidance of downhole pipe strings in oil and gas branch wells and oil and gas recovery production . Background technique [0003] A lateral well refers to a well in which two or more wellbores are drilled in one main wellbore. Branch wells can be applied to develop layered reservoirs, small reservoirs that do not have single well development value, trap blocks, top storage oil and remaining oil, etc. [0004] The branch well has two technical advantages: one is that it can greatly improve the horizontal and vertical oil displacement efficiency and improve the recovery factor; the other is that multiple short branch wellbores with the same total length can be used instead of one long horizontal wellbore to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B41/10
Inventor 刘运楼张毅超
Owner BC P INC CHINA NAT PETROLEUM CORP
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