Method for determining stage difference of horizontal directional reaming

A technology of horizontal directional drilling and determination method, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as hole wall collapse, and achieve the effect of reducing the possibility of hole collapse

Inactive Publication Date: 2016-03-30
SOUTHWEST PETROLEUM UNIV
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  • Description
  • Claims
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of existing methods for calculating the reaming level difference of horizontal directional drilling, and provide a method for determining the reaming level difference of horizontal directional drilling. The problem of the collapse of the hole wall when drilling and reaming

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  • Method for determining stage difference of horizontal directional reaming
  • Method for determining stage difference of horizontal directional reaming
  • Method for determining stage difference of horizontal directional reaming

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Embodiment example

[0073] To further illustrate the present invention, this method is used to determine the reaming level difference of a certain horizontal directional crossing project. The project is: horizontal directional drilling through the stratum dominated by silty clay, the diameter of the pipe to be laid is 914mm, the buried depth is 10m, and the mud density is 1000Kg / m 3 , The diameter of the hole left after the first level of reaming is 609.6mm. The physical and mechanical properties of silty clay are shown in Table 1 below:

[0074] Table 1

[0075]

[0076] The following are the specific steps of the calculation:

[0077] Determine the diameter of the final hole: for silty clay, the engineering coefficient C value can be taken as 1.5, and the diameter of the final hole is obtained as D=CD p =1.5*914=1371 mm.

[0078] Taking β=0.3, according to the formulas (16) and (17), it can be obtained that after the first stage of reaming, the radius of the plastic zone is 394.29mm.

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Abstract

The present invention relates to a method for determining a stage difference of horizontal directional reaming. According to the method, a plastic zone scope generated by a preceding stage of counterboring is used as a to-be-cut scope of a next stage of counterboring, i.e. a plastic zone thickness of a preceding stage is used as a cutting amount of a next stage of counterboring, i.e. a stage difference of counterboring. The method specifically comprises the following steps: (1) determining a final hole diameter; (2) determining stress distribution of an elastic zone after an (i)th stage of counterboring; (3) based on Mohr-Coulomb criteria, determining stress distribution of a plastic zone after the (i)th stage of counterboring; (4) determining a radius of the plastic zone after the (i)th stage of counterboring; (5) determining a plastic zone thickness after the (i)th stage of counterboring; (6) determining a stage difference of an (i+1)th stage of counterboring; (7) determining a radius of an (i+1)th stage of hole; and (8) comparing a diameter of the (i+1)th stage of hole with the final hole diameter, and if the diameters are close, terminating the calculation process, and determining the number of stages of counterboring. According to the method provided by the present invention, when carrying out a next stage of counterboring, a plastic zone generated by a preceding stage of counterboring is cut off, so as to prevent hole collapse caused by secondary loading of a plastic zone, and reduce possibility of hole collapse.

Description

technical field [0001] The invention relates to a method for determining the hole expansion level difference of horizontal directional drilling, belonging to the technical field of trenchless horizontal directional drilling. Background technique [0002] Horizontal directional drilling is an emerging technology that uses drilling equipment installed on the surface to drill into the formation at a small incident angle relative to the ground to form a pilot hole, and then expand the pilot hole to the required size hole and lay a pipeline. At present, due to its low harm to the environment and traffic, high pipe laying efficiency, and low construction cost, it has achieved good social and economic benefits in social applications, and is widely used in oil and gas pipelines and municipal pipelines when crossing rivers, Crossing projects under special circumstances such as roads and buildings. [0003] Reaming is one of the key technical links of directional drilling crossing te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/17G06F2113/14
Inventor 李琴徐果黄志强马亚超谭智勇
Owner SOUTHWEST PETROLEUM UNIV
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