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Thermo-sensitive type heat compensator

A heat-sensitive and compensator technology, which is applied in the direction of mining fluid, drilling equipment, wellbore/well components, etc., to achieve the effects of shortening the construction period, preventing damage and damage, and compensating for deformation

Inactive Publication Date: 2015-07-01
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to solve the problems existing in the prior art, and provide a temperature-controlled heat-sensitive thermal compensator to overcome the above-mentioned shortcomings of the existing thermal compensator, and to prevent casing or screen pipes from heat damage

Method used

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  • Thermo-sensitive type heat compensator

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Experimental program
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Effect test

Embodiment 1

[0023] Such as figure 1 As shown, the upper end of the casing collar 1 is connected to the casing or screen pipe, and the lower end is connected to the upper pup joint 2 through threads. The upper end of the connecting sleeve 3 is fixedly connected with the upper short joint 2 , and the lower end is fixedly connected with the outer cylinder 4 . The lower end of the outer cylinder 4 is fixedly connected with the fastening sleeve 9 . An inner cylinder 10 is installed coaxially in the tightening sleeve 9 , and the inner cylinder 10 is in sealing sliding contact with the tightening sleeve 9 . Preferably, a seal is installed between the fastening sleeve 9 and the inner cylinder 10 . The upper end of the inner cylinder 10 extends out from the fastening sleeve 9, and the lower end is connected with a sleeve or a screen. A piston 8 is installed in the cavity surrounded by the fastening sleeve 9, the inner cylinder 10 and the outer cylinder 4, and the piston 8 is connected with the ...

Embodiment 2

[0025] Preferably, in order to facilitate processing and disassembly, it is also possible to follow figure 1 In the shown embodiment, the outer wall of the top end of the piston 8 shrinks inward to form a first annular boss, and the stop ring 5 is an independent stop ring that is coaxially fixedly connected with the upper end of the inner cylinder 10, and its inner wall is sealed and fixedly connected with the inner cylinder 10 , the outer wall is in sealing sliding contact with the outer cylinder 4, and the lower end protrudes radially outwards to form a second annular boss, which encloses an annular space matched with the first annular boss with the inner cylinder 10. When the compensator is in the initial state, the first annular boss on the top of the piston 8 is stuck in the annulus between the second annular boss and the inner cylinder 10, and together with the limit ring 5 and the inner cylinder 10, it forms a filling and discharging thermal sensor. The airtight cavity ...

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Abstract

The invention relates to an underground thermo-sensitive heat compensator in the oil production field. The thermo-sensitive heat compensator is applied to a thickened oil thermal production well and comprises an upper short pup joint, an outer cylinder, a locking mechanism and an inner cylinder. The upper end of the outer cylinder is fixedly connected with the upper short pup joint in a coaxial mode. The lower end of the outer cylinder is axially matched with the inner cylinder in a sliding sealing mode. The locking mechanism is arranged in an annular cavity between the outer cylinder and the inner cylinder and comprises a piston, a limiting ring and a pin, wherein the inner wall of the piston is fixedly connected with the inner cylinder, the outer wall of the piston is axially matched with the outer cylinder in a sliding sealing mode, the pin is fixed to the periphery of the joint of the piston and the outer cylinder, an inner annular boss is arranged on the upper portion of the limiting ring, a closed cavity is formed by the lower portion of the limiting ring, the outer wall of the inner cylinder and the piston and filled with thermo-sensitive materials, and the axial sliding sealing matching and the limiting matching are achieved through the limiting ring and the joint of the inner cylinder and the outer cylinder. The thermo-sensitive heat compensator is reasonable in design and high in reliability; the thermo-sensitive heat compensator is suitable for various well types; procedures are simple, and subsequent construction work is not influenced; the thermo-sensitive materials are adopted, and therefore construction risks are lowered.

Description

technical field [0001] The invention relates to a downhole thermosensitive thermal compensator used in heavy oil thermal recovery wells in the field of adopting devices. Background technique [0002] In the production process of heavy oil thermal recovery wells, the biggest cause of casing damage is that the casing bears tensile stress when steam injection is heated, and then bears compressive stress after cooling, resulting in thread breakage or casing deformation, affecting later production operations . Therefore, connecting a thermal stress compensator can effectively solve the problem of casing deformation. [0003] At present, the principles of compensators used in thermal recovery wells are basically the same. The inner and outer cylinders are connected by mechanical shear pins. When steam is injected, when the thermal stress is greater than the shear force of the shear pins, the shear pins are cut and the compensator starts to work to realize casing expansion compen...

Claims

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Application Information

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IPC IPC(8): E21B43/24E21B17/00E21B43/08
CPCE21B43/24
Inventor 彭志刚张磊许婵婵徐鑫李国峰董恩博邹晓敏赵勇马明新
Owner CHINA PETROCHEMICAL CORP