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Downhole string lifting device

A downhole pipe string and short pipe technology, which is applied in the field of downhole pipe string lifting devices, can solve the problems of heavy weight, high working pressure, and high energy consumption, and achieve the effects of high degree of automation, low working air pressure, and large working stroke

Active Publication Date: 2018-01-02
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the hydraulic hydraulic slotted surface well pipe lifter has complex structure, high cost, high working pressure, high failure rate, easy to produce crawling phenomenon, resulting in unstable lifting speed, high energy consumption, and easy leakage of hydraulic oil to pollute the environment and stroke. If it is too small, if its working stroke is increased, its weight will be too large, and it will be difficult to carry, manufacture and maintain, so it is difficult to be used in the current oil field abrasive jet casing segment milling operation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Example 1: One executive cylinder working mode

[0064] When using the downhole pipe string lifting device provided by the embodiment of the present invention to carry out oil field abrasive jet casing segment milling operations: the bottom of the downhole pipe string 26 is connected to the injector 25, the solenoid valve 3 adopts a two-position three-way solenoid valve, and the solenoid valve 3 It is connected to the output terminals A+ and A- of the controller 5, because the output terminals B+ and B- are not connected to the solenoid valve, so move the transfer switch K2 to connect pin 1 and pin 4, so that the output terminals B+ and B of the controller 5 - There is no signal output, and the execution cylinder 2 adopts a film cylinder. When the controller 5 outputs a square wave signal, the LED 2 emits green light, the solenoid valve 3 acts, the air pump 4 is connected to the execution cylinder 2, and the execution cylinder 2 pushes the ratchet 11 to rotate a ratchet...

Embodiment 2

[0065] Example 2: Synchronous working mode of two execution cylinders

[0066] When using a downhole pipe string lifting device provided by the embodiment of the present invention to carry out oil field abrasive jet casing segment milling operations: the bottom of the downhole pipe string 26 is connected to the injector 25, one air pump 4 is used, and two electromagnetic valves 3 are used. Three-way solenoid valves A and B, the executive cylinder uses 2 thin-film cylinders (executive cylinder 2-A and executive cylinder 2-B). The controller 5 has 2 output terminals A+, A- and B+, B-, move the changeover switch K2 of the controller 5 to connect its pin 1 and pin 2, at this time, the 2 output terminals A+ and A of the controller 5 - output synchronous square wave signal with B+, B-. The output terminals A+ and A- of the controller 5 are connected to the solenoid valve 3-A, and the solenoid valve 3-A is respectively connected to the air pump 4 and the execution cylinder 2-A. When...

Embodiment 3

[0068] Example 3: Asynchronous working mode of 2 execution cylinders

[0069] When using a downhole pipe string lifting device provided by the embodiment of the present invention to carry out oil field abrasive jet casing segment milling operations: the bottom of the downhole pipe string 26 is connected to the injector 25, one air pump 4 is used, and two electromagnetic valves 3 are used. Three-way solenoid valves A and B, the executive cylinder uses 2 thin-film cylinders (executive cylinder 2-A and executive cylinder 2-B). The controller 5 has 2 output terminals A+, A- and B+, B-, connect pin 1 and pin 3 of the transfer switch K2 of the controller 5, at this time, the 2 output terminals A+, A- and B+ of the controller 5 , B- output asynchronous square wave signal. The output terminals A+ and A- of the controller 5 are connected to the solenoid valve 3-A, and the solenoid valve 3-A is respectively connected to the air pump 4 and the execution cylinder 2-A. When the output ter...

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Abstract

The invention provides a downhole string lifting device which is characterized by comprising a control mechanism, an actuation mechanism, a hollow lead screw, a tray, a support mechanism and a short pipe. The control mechanism is fixed onto the tray, is connected with the actuation mechanism and is used for driving the actuation mechanism to circularly move; the actuation mechanism is movably connected with the tray and is screwed with the hollow lead screw, the bottom of the lead screw can be connected with a downhole string, and the actuation mechanism is used for driving the hollow lead screw to longitudinally move, so that the downhole string can be driven to longitudinally move. The downhole string lifting device has the advantages that the downhole string lifting device is simple in structure and operation, high in automation degree and safe and reliable in work, is high and environmental friendly, can carry out section milling operation on oilfield abrasive jet casings without being driven by drilling machines and further can be used for windowing and slotting operation on the casings, and energy can be saved.

Description

technical field [0001] The invention relates to the technical field of oilfield abrasive jet casing segment milling equipment, in particular to a downhole pipe string lifting device. Background technique [0002] Existing devices used for section milling of casing in oil fields mostly use mechanical section milling cutters, which drive the section milling cutter to move through the driving device to cut the casing to complete the section milling process of casing, but the structure of the above-mentioned devices is complex, and the wear rate Higher, and the work efficiency is lower, and it is easy to produce mechanical failure and downhole accidents at the same time. [0003] The pre-mixing abrasive jet cutting technology is a high-efficiency jet technology developed in the past 30 years. Because of its wide range of cutting materials, smooth and burr-free cutting surface, and no heat-affected zone, it has been obtained since its inception. At present, this technology has b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B29/06
Inventor 商建国李学范魏秀华何军董国昌王金山王丽娟何泳李传均张新发
Owner PETROCHINA CO LTD
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