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Method for evaluating coincidence rate of actual drilling borehole trajectory and design track

A technology for designing orbits and evaluation methods, applied in wellbore/well components, earthwork drilling, measurement, etc., can solve the problems of lack of objectivity and large subjective factors, and achieve the effect of overcoming subjective factors

Active Publication Date: 2016-04-13
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0004] The purpose of the present invention is to provide an evaluation method for the coincidence rate between the actual drilling trajectory and the design trajectory, so as to solve the problems that the existing evaluation methods have large subjective factors and lack of objectivity

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  • Method for evaluating coincidence rate of actual drilling borehole trajectory and design track
  • Method for evaluating coincidence rate of actual drilling borehole trajectory and design track
  • Method for evaluating coincidence rate of actual drilling borehole trajectory and design track

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Embodiment Construction

[0024] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0025] The present invention unifies the actual drilling trajectory and the designed wellbore trajectory into one coordinate system by measuring the wellhead coordinates and altitude of the actual drilling trajectory, and calculates the vertical depth, east-west coordinates and north-south coordinates, and normalize them into fuzzy vectors, and calculate the degree of closeness to the corresponding designed orbital vertical depth, east-west coordinates, and north-south coordinates fuzzy vectors, so as to evaluate the coincidence rate between the actual drilling trajectory and the designed wellbore trajectory.

[0026] The whole process of the above evaluation method is as follows: figure 1 As shown, the specific implementation process of the method will be described in detail below taking the HH74P11 well in an oil field as an example.

[0...

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Abstract

The invention relates to a method for evaluating the coincidence rate of an actual drilling borehole trajectory and a design track, and belongs to the technical field of petroleum and gas drilling. The method comprises the steps that the actual drilling borehole trajectory and the design track are unified to a coordinate system by measuring the well mouth coordinate and altitude of the actual drilling borehole trajectory; then the well depth, well deviation and orientation of the actual drilling borehole trajectory are measured, the vertical depth, east-west coordinate and north-south coordinate of an actual drilling well are figured out and standardized to be fuzzy vectors, the close degrees between the fuzzy vectors of the vertical depth, east-west coordinate and north-south coordinate of the actual drilling well and the fuzzy vectors of the vertical depth, east-west coordinate and north-south coordinate of the corresponding design borehole track is calculated, finally, the average value of the close degrees is figured out, and the average close degree is used for evaluating the coincidence rate of the actual drilling borehole trajectory and the design borehole track. By means of the method, quantitative judgment is achieved, human active factors are overcome, and the coincidence rate of the actual drilling borehole trajectory and the design track is objectively reflected.

Description

technical field [0001] The invention relates to an evaluation method for the coincidence rate between the actual drilling trajectory and the designed trajectory, and belongs to the technical field of oil and gas drilling. Background technique [0002] In the field of oil and gas, with the advancement of drilling technology, the number of directional wells, horizontal wells and lateral wells is gradually increasing, and the design of well trajectory is gradually complicated. Chinese patent document ZL201110303599.2 "A Multi-target Horizontal Well Method for Determination of Borehole Trajectory" provides a method for determining the borehole trajectory of a multi-target horizontal well, and provides a method for determining the borehole trajectory of a multi-target horizontal well based on seismic data, geological logging data and geophysical logging data. The design of multi-target wellbore trajectory has been realized. It is foreseeable that the design of wellbore trajectory...

Claims

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Application Information

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IPC IPC(8): E21B47/09E21B47/04
CPCE21B47/04E21B47/09
Inventor 闫吉曾梁文龙屈玉凤王翔李林逢彭明
Owner CHINA PETROLEUM & CHEM CORP
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