Combined type pre-reaming construction method suitable for stratum with rock hardness smaller than or equal to 30 Mpa

A construction method and a combined technology, which are applied to drilling equipment and methods, earthwork drilling, percussion drilling, etc., can solve the problems of lack of combined pre-expanding construction methods, many times of fastening of B-type tongs, The construction technology is not very mature and other problems, so as to achieve the effect of good hole formation, reduction of safety hazards and low cost

Pending Publication Date: 2021-10-22
中石化石油工程技术服务有限公司 +1
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for more than ten years, the step-by-step reaming process in the horizontal directional drilling pipeline construction process has rarely changed.
The traditional step-by-step reaming process is weak in cutting formations, and requires manual application of B-type tongs to fasten many times and takes longer
Combined pre-expanding came into being under such a background, but the existing construction technology of combined pre-expanding is not very mature, especially lack of combined pre-expanding construction under specific construction conditions such as rock hardness ≤ 30Mpa method

Method used

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  • Combined type pre-reaming construction method suitable for stratum with rock hardness smaller than or equal to 30 Mpa
  • Combined type pre-reaming construction method suitable for stratum with rock hardness smaller than or equal to 30 Mpa
  • Combined type pre-reaming construction method suitable for stratum with rock hardness smaller than or equal to 30 Mpa

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Embodiment Construction

[0036] The present invention will be further described below in conjunction with the accompanying drawings, as shown in the accompanying drawings Figure 1 to Figure 3 As shown, taking the Gongqing River directional drilling project in the 2nd bid section of the Maoming-Yangjiang main line project of the western Guangdong natural gas main pipeline network as an example: the following steps are included,

[0037] S1: The drilling rig is in place;

[0038] 1.1 According to the actual situation of the construction stratum, the calculated pullback force is 1600KN, considering the safety factor of 2 to 3 times, the anchoring force of the ground anchor should be ≥ 3200KN.

[0039] 1.2 According to the coordinates of the entry point and exit point in the design drawings, determine the axis that the drilling rig traverses. The axis that the drilling rig traverses should be on the same line as the pipeline crossing axis or parallel to the pipeline crossing axis.

[0040] S2: drill pil...

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Abstract

The invention belongs to the technical field of combined type pre-reaming construction, and particularly relates to a combined type pre-reaming construction method suitable for a stratum with the rock hardness smaller than or equal to 30 Mpa. The combined type pre-reaming construction method comprises the following steps that S1, a drilling machine is in place; S2, a guide hole is drilled; S3, combined pre-reaming is carried out; S4, hole washing is performed; and S5, a main pipe is dragged back. Compared with a conventional step-by-step pre-reaming construction method, the method has great universality in the aspect of actual operation, and the purpose of high-speed pre-reaming is achieved; the effect is better, and the cutting capacity is 9 times that of a step-by-step pre-reaming cutting capacity; the number of times of manually applying B-type tongs for fastening is reduced, time is saved, and potential safety hazards in the operation process of personnel are reduced; and the use value and the popularization value are realized.

Description

technical field [0001] The invention belongs to the technical field of combined pre-expanding construction, and in particular relates to a combined pre-expanding construction method suitable for formations with rock hardness ≤ 30Mpa. Background technique [0002] Horizontal Directional Drilling (Horizontal Directional Drilling) is the use of drilling equipment installed on the surface to drill into the formation at a relatively small angle relative to the ground to form a pilot hole, and then pre-expand the pilot hole to the required pullback pipeline. A construction process of sizing and laying pipes (lines). [0003] With the gradual increase of the towing tonnage of the horizontal directional drilling rig, the ability to tow the pipeline is also gradually enhanced. The diameter of the towing pipeline is from DN110 to DN1200, and the length of the towing pipeline is from 300m to 2050m. However, over the past ten years, the step-by-step reaming process in the horizontal di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B7/28E21B7/04E21B21/00E21B3/02
CPCE21B7/28E21B7/04E21B21/00E21B3/02
Inventor 郭勇章邦伟杨军吴迪王世超张言亮李天天林顺钢
Owner 中石化石油工程技术服务有限公司
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