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Inclined shaft core fissure orientation method

A technology for cores and inclined wells, applied in the field of core fracture orientation of inclined wells, can solve the problem that the core fractures of inclined wells cannot be accurately oriented

Inactive Publication Date: 2014-08-13
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
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Problems solved by technology

[0005] The present invention aims to solve the above problems, and provides a method for orienting the core fractures of inclined wells, which solves the problem that the core fractures of inclined wells cannot be accurately oriented

Method used

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  • Inclined shaft core fissure orientation method
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  • Inclined shaft core fissure orientation method

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specific Embodiment approach

[0106] The specific technical scheme of the invention is illustrated by taking the core fracture orientation of the second member of the Paleogene Funing Formation (abbreviated as the second member of the Funing Formation) of five inclined wells in a fault block in the Tongcheng fault zone of Jinhu Sag, Subei Basin as an example:

[0107] First, count the inclined wells with coring in the fault block, and confirm that there are core data of Fu 2 Member in Well TianX33-1, TianX33-2, TianX33-3, Wu101X1 and Qiao1 , respectively calculate and organize the well inclination angle, azimuth angle and wellhead coordinates of the five wells, and obtain the real geodetic coordinates (X, Y) corresponding to the observed core according to the formula (1), as shown in Figure 5 shown; sort out the inclination angle and azimuth angle corresponding to the coring place of each deviated well, as shown in the third column and the fourth column in Table 1.

[0108] Second, because the core fractu...

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Abstract

The invention relates to the field of the exploitation and development of oil and gas fields, and in particular relates to an inclined shaft core fissure orientation method. The method is characterized by comprising the following steps: on the basis of drilling data, calculating well deviation information of a coring interval, calculating the real attitude of a rock stratum according to earthquake data, determining an apparent dip of the core fissure and an angle between the fissure apparent inclination and apparent inclination of the rock stratum according to the core data, designing an inclined shaft core fissure orientation concept on the basis, deriving a corresponding algorithm, and realizing the accurate orientation of the core fissure. By adopting the method, the problem that the inclined shaft core fissure cannot be orientated can be solved, the inclined shaft core fissure orientation accuracy is improved, and the practical value on multiple aspects such as accurately determining the permeation rate advantageous direction of a reservoir stratum of the oil and gas field, the relative position relation of a water filling well and an oil recovery well, direction of ancient stress field in the crack generation period, reasonable layout and development of well networks can be realized.

Description

technical field [0001] The invention relates to the field of exploration and development of oil and gas fields, in particular to a method for orienting fractures in cores of deviated wells. Background technique [0002] Core fracture orientation refers to determining the three-dimensional distribution orientation of the fracture surface on the core taken out from the well. The orientation of core fractures has always been the key to the study of reservoir fractures, and it is also the basic content of core fracture description. The orientation of core fractures is the key to determining the dominant direction of reservoir permeability in oil and gas fields, rationally deploying development well patterns, and determining the relative position relationship between water injection wells and oil production wells. The key is also an important basis for determining the direction of the paleo-stress field during the fracture-making period. [0003] With the exploration and develop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C1/00G01C9/00
CPCG01C1/00G01C9/00
Inventor 刘敬寿戴俊生刘敬富史永坤王雪静李磊任启强王硕房拴虎
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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