Structure design method for guiding type rotary steering drilling tool

A technology of rotary steerable drilling and structural design, which is applied to drilling equipment and methods, drilling equipment, directional drilling, etc., and can solve problems that have not been studied in depth

Inactive Publication Date: 2009-10-28
CHINA NAT OFFSHORE OIL CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, no in-depth research has been carried out on the selection and determination of the bending deformation of the

Method used

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  • Structure design method for guiding type rotary steering drilling tool
  • Structure design method for guiding type rotary steering drilling tool
  • Structure design method for guiding type rotary steering drilling tool

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0103] Example 1: The R of the mandrel 5 in the pointing rotary steerable drilling tool 外径 and R 内径 are 9.5cm and 4.5cm respectively, and the length l of the mandrel 5 is 400cm, the bias mechanism 4 is located at the midpoint of the mandrel 5, that is, AC=200cm, and the maximum deflection y of the mandrel 5 is set max = 2cm, the variation law of the axial displacement λ of the mandrel 5 after bending and the stress σ produced by the mandrel 5 is as follows, as shown in Table 1:

[0104] Table 1

[0105] Preface

No

R 外径

R 内径

J

E

y

l

P

lambda

σ

1

9.5

4.5

379.5

2100000

1

400

597.7

0.017

90.563

2

9.5

4.5

379.5

2100000

2

400

1195.4

0.069

362.250

3

9.5

4.5

379.5

2100000

3

400

179...

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Abstract

The invention relates to a structure design method for a guiding type rotary steering drilling tool, and the method comprises the following steps: 1) a mandrel in the guiding type rotary steering drilling tool is considered as an overhanging beam, a lower bearing is used as a hinge, an upper bearing is used as a sliding hinge, and the force applied by an offset mechanism to the mandrel is taken as concentrated load; 2) a rectangular coordinate system of the overhanging beam is established: the lower bearing is taken as the origin point, the axial direction of a well is taken as the X axis direction, the positive direction points at the support point of the upper support bearing opposite to the mandrel from the origin point along the X axis, the Y axis goes through the origin point, and the positive direction of the Y axis is opposite to the direction of the concentrated load; 3) the structural mechanics equation of the overhanging beam is obtained on the basis of the hypothesis and the established rectangular coordinate system. The research thought provided by the invention provides design theoretical basis for controlling the well track by the drilling tool.

Description

technical field [0001] The invention relates to a structural design method of an offshore oil drilling tool, in particular to a structural design method of a pointing rotary steerable drilling tool. Background technique [0002] In the research and application of rotary steerable drilling tools, the deflection ability of pointing drilling tools is favored by many operators because of its high reliability. The deflection capability of this tool is mainly related to the design structure of the tool itself, which is different from traditional drilling tools, whose deflection capability mainly depends on the softness of the formation. One of the biggest features of the design structure of this tool is that an offset tool is placed in the middle of the tool. During the process of wellbore trajectory control, the offset tool bends the mandrel of the rotary steerable drilling tool, resulting in an offset in the direction of the tool face. deflection, so as to achieve deflection bu...

Claims

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Application Information

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IPC IPC(8): E21B7/04E21B3/02
Inventor 姜伟
Owner CHINA NAT OFFSHORE OIL CORP
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