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Gas-drilling continuous circulation device

A circulation device and gas drilling technology, which is applied in construction and other directions, can solve the problems of low service life, impact, and low efficiency of seals, and achieve the effects of high operating efficiency, low wear, and reduced non-drilling time

Inactive Publication Date: 2016-12-14
CNPC BOHAI DRILLING ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the existing continuous circulation device such as the published patent CN101942977B, its main engine is installed on the drilling floor of the drilling rig, which affects other operations on the drilling floor, and is limited by the distance between the bottom of the top drive and the top of the circulation device. , unloading a single root, unable to connect and unload the column (vertical root), the efficiency is low
The ram is completely used to form a sealed cavity, and the sealing colloid of the upper half-sealed ram is directly worn by the rotation of the drill pipe, and the service life of the seal is low

Method used

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Embodiment Construction

[0027] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but the following embodiments in no way limit the present invention.

[0028] This gas drilling continuous circulation device is suitable for loading and unloading a single root or column, and it is installed at the lower part of the drill floor 13 of the drilling rig, so that other supporting devices of the drilling rig above the drilling floor are not affected, and at the same time, it is not affected by the height from its top to the drill floor. limit.

[0029] Such as figure 1 As shown, the gas drilling continuous circulation device for loading and unloading a single root or a column includes a drill pipe power tong assembly 1, a power cylinder group 4, a bracket 3, a rotary control head 5, an upper bypass valve 6, and four ram preventers. Injector 7 and lower bypass valve 8; wherein:

[0030] The drill pipe power tong assembly 1 includes ...

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Abstract

The invention discloses a gas-drilling continuous circulation device which is mounted under the drill stand top of a drilling machine and fixed to a drilling blowout preventer stack, applies to rotary disk drillers and top drive drillers, does not occupy the space of the drill stand top, and is high in operation efficiency in pipe or column connecting and breaking down. The gas-drilling continuous circulation device comprises a drill pipe power tong assembly, a power cylinder set, a support, a rotary control head and a four-ram blowout preventer arranged from top to bottom in sequence. By mutual cooperation of the components, the device can keep continuous circulation inside a wellbore in the process of gas-drilling pipe or column connecting and breaking down, complicated downhole circumstances caused by gas circulation interrupt are avoided, and non-drilling time is reduced.

Description

technical field [0001] The invention relates to the technical field of drilling equipment, in particular to a gas drilling continuous circulation device. Background technique [0002] Gas drilling technology can greatly increase the rate of penetration, shorten the drilling cycle, and reduce drilling costs. At present, in conventional gas drilling operations, gas injection must be stopped and the pressure released before connecting and unloading the single well, connecting the column, and unloading the column. After the operation is completed, the gas injection should be resumed to restore the circulation in the wellbore. During the stop of gas injection, cuttings sink, and for vertical wells, they are easy to deposit around the drilling tool, causing pipe sticking; for highly deviated wells and horizontal wells, they are easy to deposit at the bottom of the wellbore to form a cuttings bed, causing pipe sticking . At the same time, formation water accumulates in the annulu...

Claims

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Application Information

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IPC IPC(8): E21B21/16
CPCE21B21/16
Inventor 马金山齐金涛徐朝阳郗凤亮徐海潮魏臣兴胡志坚肖建秋梁国红郭云鹏苏尚文
Owner CNPC BOHAI DRILLING ENG