Permanent double layer well body structure for realizing gas well continuous circulation

A wellbore structure and permanent technology, applied in wellbore/well components, flushing wellbore, earthwork drilling, etc., can solve the problems of unrealized continuous circulation and narrowness of drilling operations, and achieve the effect of continuous reservoir evaluation

Inactive Publication Date: 2005-06-29
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above three technologies are only used for temporary gas injection channels in gas and liquid drilling (drilling fluid is still injected into the drill string, and the annulus between the drill string and casing is still used as a return channel), so this channel is temporary , narrow, only used for gas injection in aerated fluid drilling, and does not achieve continuous circulation throughout the drilling operation

Method used

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  • Permanent double layer well body structure for realizing gas well continuous circulation
  • Permanent double layer well body structure for realizing gas well continuous circulation
  • Permanent double layer well body structure for realizing gas well continuous circulation

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Embodiment Construction

[0031] The double-layer wellbore structure includes a cemented casing (or a solid open hole wall) (1), a thin-walled inner pipe (2) inside the casing (1), and a thin-walled inner pipe (2) It can be a special-shaped tube or a round thin-walled tube. The upper end of the inner pipe (2) is fixed on the wellhead with a casing head adapted to it, and there is an upper guide nipple for guiding the drill bit and the centralizer to enter the inner pipe (2) when running in; the lower end of the inner pipe (2) is connected to the casing (1) It adopts plug-in sliding spline structure connection (allows the inner pipe (2) to slide up and down in a small range, but cannot rotate in the circumferential direction, so as to prevent the inner pipe (2) from twisting and deforming in the well), and guides the drill bit when pulling out, The centralizer enters the lower guide nipple of the inner tube (2). The special-shaped inner pipe (2) can be trilobal or other shapes. The entire inner pipe (...

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Abstract

A permanent double-layer wellbore structure for realizing continuous circulation of oil and gas wells, comprising a cemented casing (1), a thin-walled inner tube (2) added to the casing (1), and the inner tube (2) It can be a shaped tube or a circular tube, so that an annular flow channel (3) is formed between the inner tube (2) and the casing (1), and an inner flow channel (4) is also formed in the inner tube (2). When there is no operating string in the well, the flow channel (3) and the inner flow channel (4) form a circulation loop; and when there is a drill string (5) in the well, the flow channels (3), (4) and the drill string (5) ) The hollow runner (6) forms a circulation loop. In this way, regardless of whether there is a working string in the well, the continuous circulation of drilling fluid can be realized to ensure the safety of drilling operations, especially when the drill string is disconnected due to man-made or fault, the immersed oil and gas can be removed in time to prevent gas accumulation and damage lead to a blowout. The invention is suitable for operations such as well drilling, workover, and well completion, and is especially important for underbalanced drilling, high-pressure, large-volume wells, deep wells, and high-H2S oil-gas wells.

Description

technical field [0001] The invention relates to the well body structure of oil and natural gas wells. Background technique [0002] The wellbore of oil and gas wells mainly consists of cemented casings (or solid open hole walls). During drilling operations, there is a drill string composed of drill pipe and drill collar in the well, the lower end of the drill string is connected to the drill bit, and centralizers are often installed at certain positions of the drill string to maintain the stability of the borehole size. [0003] In the process of drilling and workover of oil and gas wells, the circulation system in the well is composed of the annular space between the hollow flow channel of the drill string and the casing (or well wall). After the drilling fluid is pressurized, it passes through the inner flow channel of the hollow drill string. It is transported to the drill bit, then reaches the bottom of the well through the nozzle of the drill bit, and then enters the a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B21/00E21B21/08
Inventor 孟英峰梁红
Owner SOUTHWEST PETROLEUM UNIV
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