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Electric control self-walking packer for horizontal well

A packer and self-propelled technology, applied in sealing/isolation, drilling equipment, wellbore/well components, etc., can solve problems such as operational safety risks, downhole string safety failures, and complex operating processes, and simplify operations process, reduce operating and supporting costs, and improve the effect of safety performance

Inactive Publication Date: 2021-01-12
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides an electronically controlled self-propelled packer for horizontal wells. The downhole conditions are complicated, and the setting and unsealing forces are difficult to control accurately, which may easily cause the safety failure of the downhole string; When the setting position of the packer needs to be adjusted, it needs to be equipped with a workover power device to drag the entire pipe string. The operation process is complicated, the cost is high, and there are operational safety risks

Method used

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  • Electric control self-walking packer for horizontal well

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Such as figure 1 As shown, an electronically controlled self-propelled packer for horizontal wells, including cable 1, centralizer 3, oil bag 4, setting mechanism 6, rubber tube 7, crawling mechanism 8 and guide head 9, cable 1, centralizer 3 , oil bag 4, setting mechanism 6, rubber tube 7, crawling mechanism 8 and guide head 9 are connected sequentially from left to right.

[0020] Realize the power supply and signal transmission of the electronically controlled self-propelled packer through the cable 1; realize the self-propelled self-propelled electronically controlled self-propelled packer in the wellbore position of the horizontal well through the crawling mechanism 8; determine the crawling position of the crawling mechanism through the steering head 9 to realize The precise positioning of the electronically controlled self-propelled packer in the horizontal well; the repeated setting and unsealing of the electronically controlled self-propelled packer at any posi...

Embodiment 2

[0022] On the basis of Embodiment 1, further, the cable 1 is an armored cable. Cable 1 is connected to the wellhead power supply, and is mainly responsible for supplying power to the electronically controlled self-propelled packer. It is also the control signal transmission channel of the electronically controlled self-propelled packer. Packing, unpacking and other actions are controlled; the armored cable can well adapt to the environment of horizontal wells, prevent external jamming, pressure, collision, etc., and has good waterproof performance, which can well ensure the power supply of the electronically controlled self-propelled packer And the stability of signal transmission performance, strong adaptability, and prolong service life.

[0023] Further, it also includes a cable joint 2 through which the cable 1 is connected to the centralizer 3 . The armored cable is connected to the electronically controlled self-propelled packer of the horizontal well through the cable ...

Embodiment 3

[0025] On the basis of Example 2, the centralizer 3 is a roller centralizer. The centralizer 3 is mainly to ensure that the electronically controlled self-propelled packer is axially centered in the casing of the horizontal well, and at the same time adopts a roller design to reduce frictional resistance during the reciprocating movement of the electronically controlled self-propelled packer in the casing.

[0026] Further, the roller bearing of the roller centralizer is provided with an elastic mechanism. The elastic mechanism is an existing structure. When encountering debris or scaling on the inner wall of the casing, it can overcome obstacles to a certain extent and improve the self-propelled adaptability of the electronically controlled self-propelled packer.

[0027] The roller centralizer includes a centralizer body 3-1 and a direction scroll wheel 3-2, the number of direction scroll wheels 3-2 is multiple, and the plurality of direction scroll wheels 3-2 are distribute...

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Abstract

The invention belongs to the technical field of oil extraction, and particularly provides an electric control self-walking packer for a horizontal well. The electric control self-walking packer comprises a cable, a centralizer, an oil bag, a setting mechanism, a rubber sleeve, a crawling mechanism and a guide head which are sequentially connected from left to right. The problems that repeated setting times of a conventional packer are limited, setting force and unsetting force are difficult to control accurately, safety faults of an underground pipe column are prone to being caused, a well repair power device needs to be matched when an existing packer is adjusted, the operation process is complex, the cost is high, and operation safety risks exist are solved; and remote electric control position adjustment and repeated setting and unsetting of the packer at any position of a horizontal wellbore are achieved, power devices such as a workover treatment vehicle must be matched when the whole process pipe column is dragged are omitted, the operation process is simplified, meanwhile, the operation and matching cost can be greatly reduced, and the safety performance of downhole operation is improved.

Description

technical field [0001] The invention belongs to the technical field of oil recovery, in particular to an electronically controlled self-propelled packer for horizontal wells. Background technique [0002] The packer is the most commonly used downhole tool for wellbore operations in oil and water wells. Its main function is to separate the annulus between the tubing and casing in different well sections of the wellbore, thereby realizing oil and water well production in layers, water injection and related measures. For horizontal wells, due to the special structural form of the horizontal well section, higher technical requirements are put forward for the performance of the packer, for example, lower setting and unsealing forces are required to ensure the safe operation of the process string. In the special operations of horizontal wells (segmented production test operations), it is often necessary to seal different intervals multiple times, but there are two outstanding prob...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/12E21B23/06E21B17/10
CPCE21B33/12E21B23/06E21B17/10
Inventor 李大建赵振峰刘广胜甘庆明朱洪征王百常莉静杨海涛崔文昊苏祖波
Owner PETROCHINA CO LTD
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