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Method for directionally drilling inclined hole in steeply-inclined stratum

A technology of steep inclination and formation, applied in the directions of directional drilling, drilling equipment and methods, drilling equipment, etc., can solve the problems of difficulty in drilling up and down, small annulus clearance between drilling tools and well wall, difficult bending of drilling tools, etc. The effect of shortening the construction period, improving the quality of geological exploration and reducing costs

Inactive Publication Date: 2013-06-05
SICHUAN LUZHOU 135 GEOTECHN ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] ① The annulus gap between the drilling tool and the well wall is small (only 2-3mm), and the drilling tool is difficult to bend;
[0006] ② The wall thickness of the drilling tool is relatively thin (the normal thickness is 5mm, and the thread connection is only 1.75mm), and the drilling tool is drilled in the inclined hole after the deflection, which is easy to cause the drilling tool to break;
[0007] ③ After deflection, it is difficult for the drilling tool to go up and down; the friction force increases, and it is difficult to achieve high-speed drilling

Method used

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  • Method for directionally drilling inclined hole in steeply-inclined stratum
  • Method for directionally drilling inclined hole in steeply-inclined stratum

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Embodiment Construction

[0020] The method for carrying out directional inclined hole drilling in steeply inclined formations of the present invention comprises the construction of straight hole section, the construction of deflecting section and the construction of slightly increasing hole inclined section, and its steps are as follows:

[0021] 1. Construction of straight hole section

[0022] use The 130mm alloy drill bit drills the hole to the bedrock and goes into the 127mm orifice pipe and cemented. The specific process is as follows:

[0023] (1) Install drilling rigs, drilling towers, water pumps, generator sets and other equipment and facilities according to the specifications;

[0024] (2) Prepare drill bits, drill pipes, casings, special joints, special tools and other equipment required for this construction;

[0025] (3) Prepare drilling tools according to the drilling tool combination and requirements required for drilling, and wait for acceptance of the drilling;

[0026] (4) Ope...

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Abstract

The invention discloses a method for directionally drilling an inclined hole in the steeply-inclined stratum, comprising construction of a straight-hole section, a deflecting section and a hole micro-increasing inclined section as well as comprises the following specific steps of: firstly, drilling by adopting a general directional drilling technology; secondly, feeding an orifice pipe; thirdly, finishing straight hole section construction by adopting a diamond wire line coring drilling technology; fourthly, starting the deflecting section construction by adopting the general directional drilling technology; fifthly, reaming by adopting the general directional drilling technology; and sixthly, constructing the hole micro-increasing inclined section by adopting the diamond wire line coringdrilling technology. The invention has the benefits that the general directional drilling technology and the diamond wire line coring drilling technology are organically combined to successfully solve the problems that a drill rig is difficult to bend, easy to break off and difficult to realize high rotating speed drilling, effectively improve the geological exploration quality, shorten the construction period and reduce the cost.

Description

technical field [0001] The invention relates to a drilling construction method, in particular to a method for directional inclined hole drilling in steeply inclined formations. Background technique [0002] In the long-term core drilling construction, the drilling trajectory will deviate from the design due to the influence of stratum dip angle, lithology soft and hard interbed, fault, WOB and other factors. A large number of construction drilling statistics show that: in steeply inclined strata Medium (formation dip > 45°), most (more than 90%) boreholes deviate in the down-dip direction. Drilling in steeply inclined strata, if it migrates along the dip, it will cause the following adverse consequences: ①The drilling depth will be greatly increased; ②The construction difficulty will increase; ③The geological design purpose will not be achieved; ④The construction cost will increase exponentially, etc. . In order to solve these problems, many boreholes need to design and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B7/04E21B7/08E21B7/28
Inventor 冯建国朱刚黄平胡正平廖勇戴敬儒柯军黄守权张东矩高原何明刚成键为
Owner SICHUAN LUZHOU 135 GEOTECHN ENG
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