Method for calculating stratigraphic dip through lateral drilling curvature radius

A technology of formation inclination and curvature radius, which is applied in earth-moving drilling, wellbore/well components, seismic signal processing, etc., can solve problems such as inability to accurately reflect formation inclination, and achieve the effect of easy data acquisition and concise steps.

Inactive Publication Date: 2015-01-07
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In structural axes, structural turning points and complex zones, seismic data and well logging data are affected by objective conditions and cannot accurately reflect formation dip angles

Method used

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  • Method for calculating stratigraphic dip through lateral drilling curvature radius
  • Method for calculating stratigraphic dip through lateral drilling curvature radius
  • Method for calculating stratigraphic dip through lateral drilling curvature radius

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Experimental program
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Effect test

Embodiment 1

[0031] A method for calculating the dip angle of a formation by the radius of curvature of a sidetracking well, comprising: projecting at least three boreholes of a directional well onto the same section, processing data with the well deviation according to the principle of three points being in a circle, and calculating three drilled encounter points ground dip angle.

[0032] Described method specifically comprises the steps:

[0033] a. Collect well deviation data and formation layering data of a single well;

[0034] b. Calculate the well deviation data and stratum layer data through the wellbore trajectory to obtain the parameters of each drilling point with the wellhead position as the coordinate origin;

[0035] c. Reasonably determine the co-circular profile of the three points and calculate the vertical depth difference, displacement difference and difference ratio of each drilling point;

[0036] d. Calculate the formation dip angle of the drilled point profile by ...

Embodiment 2

[0045] The present invention is mainly for inclined formations, a directional well has 3 boreholes (or more) (attached figure 1 ), according to the principle of determining a circle at 3 points on the plane, projecting 3 boreholes onto a profile at a certain azimuth is enough to determine a circle (attached figure 2 , attached image 3 ), using the well deviation processing data to calculate the formation dip angles of the three drilled points. According to theoretical derivation and mathematical calculation, the formation dip angles of the top or bottom of the front eye, side eye 1, and side eye 2 are obtained.

[0046] Method of the present invention is specifically as follows:

[0047] 1. Collect the well deviation data and stratigraphic stratification data of the front hole, side hole 1, side hole 2....

[0048] 2. Through the calculation of wellbore trajectory, parameters such as vertical depth, horizontal displacement and displacement azimuth of each drilling point a...

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Abstract

The invention discloses a method for calculating the stratigraphic dip through the lateral drilling curvature radius. The method comprises projecting at least three well holes of a directional well to a profile; determining a circle through three points which are projected to the profile; calculating the stratigraphic dip of three drilling points through well deviation processing data. According to the method for calculating the stratigraphic dip through the lateral drilling curvature radius, the processing is performed on the well deviation data and accordingly the means for calculating the stratigraphic dip can be increased, the accuracy of the stratigraphic dip can be verified, and the auxiliary judgment can be performed on the structure form for the dipping formation.

Description

technical field [0001] The invention relates to a method for calculating the formation dip angle by the radius of curvature of a sidetracking well, and belongs to the field of calculation of the formation dip angle for directional well drilling. Background technique [0002] With the deepening of petroleum exploration and development and the improvement of gas reservoir exploitation, more and more well types adopt highly deviated wells and horizontal wells. In order to ensure the success of the target area, the data of the dip angle of the formation at the reservoir interface is very important. In the prior art, there are many methods for calculating formation dip. For example, Chinese Patent No. "201310272811.2" discloses a method for estimating high-precision formation dip. Flipping is to perform vector field flipping, calculate vector set distance, calculate vector filter weighting, and finally perform vector weighted filtering processing. [0003] The most common and e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/02G01V1/30
CPCE21B49/00E21B47/022
Inventor 吴萍王礼学唐家琼庞江平罗芳王滢
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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