Method for reaming by explosion of detonating cord under well

A detonating cord and hole reamer technology, applied in drilling equipment and methods, blasting, drilling equipment and other directions, can solve the problems of small chip return channel, easy occurrence of pump stagnation, etc., and achieve the effect of convenient operation

Active Publication Date: 2018-11-20
中石化石油工程技术服务有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The chip return channel is small, and it i...

Method used

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  • Method for reaming by explosion of detonating cord under well
  • Method for reaming by explosion of detonating cord under well
  • Method for reaming by explosion of detonating cord under well

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Embodiment Construction

[0035] like figure 1 As shown, the downhole detonating cord explosion reaming method of the present invention comprises the following steps in turn: (1) installing a pilot reamer C at the lowermost end of the drill string; (2) screwing the explosive reaming above the pilot reamer C (3) The variable-diameter reamer A is screwed on the top of the explosive reamer B; (4) The upper end of the variable-diameter reamer A is connected to the drill string above; Down, the drill string goes down while rotating, and at the same time, the pilot reamer C can remove the sundries attached to the well wall; The drill string stops descending and stops rotating; (7) Turn on the mud pump and pressurize it to the set pressure for detonation to detonate the detonation index of the explosive reamer B, and the shock wave generated by the explosion acts on the rocks on the wellbore wall, resulting in formation The rock is crushed and broken to achieve reaming; (8) Turn the mud pump to the construct...

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Abstract

The invention relates to a method for reaming by detonation of a detonating cord under a well. The method comprises the following steps: sequentially mounting a pilot reamer, an explosion reamer and avariable-diameter hole trimming device at the lowest end of a drill stem from bottom to top; enabling the drill stem to rotate and descend simultaneously, and when the drill stem descends until the explosion reamer is completely flush with the height of a predetermined reaming section, enabling the drill stem to stop descending and rotating; opening a mud pump and pressurizing same to the set detonation pressure to detonate the detonating cord of the explosion reamer, wherein shock waves generated by the explosion act on rocks of a well wall to cause stratum rocks on the entire periphery of this section to be crushed and fractured, thereby achieving reaming; opening the mud pump to the construction displacement and taking rock debris generated by the explosion reaming out of the well; enabling the drill stem to continuously descend, so that the variable-diameter hole trimming device reaches the reaming section to trim the well wall of the reaming section; and pulling the drill stem out of the well, putting a hole diameter logging unit into the well to detect the hole diameter and determining whether predetermined reaming requirements are met. By adopting the method, the reaming speed is high, risks under the well are low, the phenomena of repeatedly pulling a drill out of the well and putting the drill into the well is avoided and the well drilling efficiency is improved greatly.

Description

technical field [0001] The invention relates to a downhole detonating cord explosion hole reaming method, which belongs to the technical field of petroleum drilling equipment. Background technique [0002] In oil drilling operations, the creep and extrusion of salt-gypsum layers can cause borehole diameter shrinkage, pipe sticking, difficulty in running casing, poor cementing quality, and casing collapse, leading to serious drilling accidents. When drilling into salt-gypsum formations, the conventional method is to start the pump early, remove the pump late, ream frequently, strictly control the drilling speed, increase the drilling fluid density, and prevent the salt-gypsum layer from creeping through the pressure difference. Can not fundamentally solve the above hidden dangers. A more secure approach is to use downhole reaming technology to expand the wellbore in the salt-gypsum layer section to offset the displacement caused by the creep of the salt-gypsum layer, thereby...

Claims

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Application Information

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IPC IPC(8): E21B7/28F42D3/04
CPCE21B7/28F42D3/04
Inventor 陈小元秦春文平黎学年刘亚王委程智勇谢志超韩双艳时益情
Owner 中石化石油工程技术服务有限公司
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