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Near drill local low pressure drilling tool

A drilling tool and near-bit technology, which can be used in drill bits, drilling equipment, earth-moving drilling, etc.

Inactive Publication Date: 2006-04-12
SHENGLI PETROLEUM ADMINISTRATION BUREAU DRILLING TECH ACAD SINOPEC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at this stage, the underbalanced technology of the whole well section is only applicable to some formations, and this technology has high requirements for equipment capacity, large investment, and is prone to complex situations such as well spattering and borehole expansion, and the conditions for large-scale application are not yet mature.

Method used

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  • Near drill local low pressure drilling tool

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Embodiment Construction

[0008] The present invention will be further described now in conjunction with the accompanying drawings of the description.

[0009] When using the present invention for hydraulic pulse low-pressure drilling construction, the casing [4] is hollow cylindrical, with threads processed at both ends, and the limit plug [8] processed with a flow channel is loaded into the lower end of the casing [4] , the inner tube [3] is hollow cylindrical, and the upper and lower ends are respectively processed with an upper back pressure hole [2] and a lower back pressure hole [7]. The spool valve [5] of the center flow channel is loaded into the inner lower end of the inner tube [3] sequentially, wherein the spool valve [5] and the inner tube [3] are sealed, and the lower end of the spool valve [5] extends into the spool valve spring [ 6], the shoulder of the spool valve [5] is in contact with the upper end surface of the spool valve spring [6], and then the inner tube [3] is fitted into the h...

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Abstract

A well drilling tool able to generate local low pressure near the drill bit for increasing drilling speed is composed of commutating jointer, internal tube, casing, slide valve with spring, and limited blocking head. It features that the channel of drilling liquid is periodically blocked to generate negative pressure and the negative pressure is delivered to well bottom.

Description

technical field [0001] The invention belongs to a supporting device for oil and natural gas drilling. technical background [0002] As the well depth increases, the drilling speed gradually decreases. The reasons can be summarized as the following two aspects. (1) Under the action of the pressure difference between the bottom hole liquid column pressure and the formation pore fluid pressure, the cuttings generated by the rock broken by the drill bit are crushed. Pressed in place and repeatedly cut by the drill bit, it hinders the exposure of the new broken surface of the rock and reduces the efficiency of the drill bit in rock-breaking drilling, that is, the "holding effect". (2) The rock at the bottom of the well is subjected to the pressure σ of the overlying strata h e and the normal stress σ of the bottom hole fluid column n e The role of , generally 0<σ n e <σ h e , according to the three-dimensional Griffith strength criterion, the...

Claims

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Application Information

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IPC IPC(8): E21B10/60
Inventor 倪红坚韩来聚李作会
Owner SHENGLI PETROLEUM ADMINISTRATION BUREAU DRILLING TECH ACAD SINOPEC
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