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Method and system for characterization of natural fracture parameters in horizontal section core

A natural fracture and parameter characterization technology, applied in earthwork drilling, wellbore/well components, measurement, etc., can solve problems such as high cost, difficult to achieve directional coring, underutilized data, etc., and achieve the goal of reducing risk and cost Effect

Active Publication Date: 2020-08-28
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, coring in the horizontal section of a horizontal well is difficult and expensive, and it is difficult to achieve directional coring, resulting in scarce horizontal well core data, and these data have not been fully utilized

Method used

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  • Method and system for characterization of natural fracture parameters in horizontal section core
  • Method and system for characterization of natural fracture parameters in horizontal section core
  • Method and system for characterization of natural fracture parameters in horizontal section core

Examples

Experimental program
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Effect test

Embodiment 1

[0053] to combine Figure 5A As shown, the crack 401 and the extending direction 403 of the horizontal section form a The inclination azimuth of the horizontal well is ∠α 1 . To calculate the fracture direction φ 1 , it is first necessary to determine which direction the fracture is inclined to in the horizontal section.

[0054] to combine Figure 5B As shown, establish a coordinate system in which the horizontal section extension direction 403 is the horizontal axis, and the crack 401 passes through the origin of the coordinate system. At this time, the crack 401 or the extension line of the crack 401 falls into the first and third quadrants, so it is determined that the crack tends to extend to the horizontal section. direction;

[0055] according to Figure 5A It can be seen that Therefore, α can be 1 , Substituting into the first formula in formula (1) to calculate the fracture direction φ of the natural fracture 1 ,Right now

[0056] In addition, there ar...

Embodiment 2

[0059] to combine Figure 6A As shown, the crack 401 and the extending direction 403 of the horizontal section form a The inclination azimuth of the horizontal well is ∠α 2 .

[0060] to combine Figure 6B As shown, since the crack 401 or the extension line of the crack 401 falls into the first and third quadrants, the crack tends to extend in the direction of the horizontal section;

[0061] according to Figure 6A It can be seen that Therefore, put α 2 , Substituting into the second formula in formula (1) to calculate the fracture direction φ of the natural fracture 2 ,Right now

[0062] In addition, there is another special case, when the crack 401 is perpendicular to the extending direction 403 of the horizontal section, that is, the crack 401 forms an angle of 90° with the extending direction 403 of the horizontal section, if the Then α can be 2 , Substituting into the second formula in formula (1) to calculate the fracture direction φ of the natural fra...

Embodiment 3

[0064] to combine Figure 7A As shown, the crack 401 and the extending direction 403 of the horizontal section form a The inclination azimuth of the horizontal well is ∠α 3 .

[0065] to combine Figure 7B As shown, since the crack 401 or the extension line of the crack 401 falls into the second and fourth quadrants, it is determined that the crack is inclined to the initial direction of the horizontal section.

[0066] Such as Figure 7A as shown, should be less than 360°, so the α 3 , Substituting into the third formula in formula (1) to calculate the fracture direction φ of the natural fracture 3 ,Right now

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Abstract

The invention provides a horizontal segment core natural fracture parameter characterization method and system. The method comprises the steps that according to data of a horizontal well, well deviation azimuthal angle and well deviation angle of a horizontal segment are obtained; according to core data of the horizontal segment, the extending direction of the horizontal well is taken as the reference direction, an included angel of a natural fracture and the reference direction is measured along the core axial of the horizontal segment, the plane perpendicular to the core axial is taken as the apparent horizontal plane, and the apparent dip of the natural fracture is measured; the well deviation azimuthal angle is used for modifying the included angel of the natural fracture and the reference direction, the direction of the natural fracture is obtained, the well deviation angel is used for modifying the apparent dip of the natural fracture, the dip of the natural fracture is obtained,and parameter characterization of the horizontal well core fracture is achieved. The growth characteristics of the natural fracture can be clearly known by using the method and the system, the basisis provided for making sure of distribution regularities of the natural fracture, guiding well network deployment and reservoir fracturing reformation, thus the risk cost of oil-gas exploration is lowered, and important implications for guidance of oil-gas development and production are achieved.

Description

technical field [0001] The invention relates to the technical field of exploration and development of horizontal wells, in particular to a method and system for characterizing natural fracture parameters of rock cores in horizontal sections. Background technique [0002] Horizontal wells are special wells whose maximum inclination reaches or approaches 90° (generally not less than 86°), and maintains a certain length of horizontal well section in the target layer. Sometimes for some special needs, the inclination angle can exceed 90°, "upward warping". Generally speaking, horizontal wells are suitable for thin oil and gas layers or fractured oil and gas reservoirs, with the purpose of increasing the exposed area of ​​oil and gas layers. Although the cost of horizontal wells is higher than that of vertical wells, the output of non-fractured reservoirs is about 3 times that of vertical wells, and the output of reservoirs with natural fractures can reach 12 times that of verti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/00E21B43/26
CPCE21B47/022E21B49/00
Inventor 吕文雅曾联波梁丰陆诗磊
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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