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Method of Predicting Formation Fracture Pressure Using Image Logging Data

A formation fracture pressure, imaging logging technology, applied in special data processing applications, instruments, calculations, etc., can solve the problems of difficult implementation, high cost, and difficult measurement of formation fracture pressure in deep formations, and avoid shear stress boundary conditions , the effect of accurate prediction results

Active Publication Date: 2018-06-12
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to address the defects and deficiencies in the prior art, and provide a method for predicting formation fracture pressure using imaging logging data. This method solves the problem of relatively expensive hydraulic fracturing measurement methods in the prior art. High and difficult to implement in deep formations, it is difficult to measure formation fracture pressure technical problems, and compared with array acoustic logging, it provides a new fracture pressure prediction method using imaging logging data

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  • Method of Predicting Formation Fracture Pressure Using Image Logging Data
  • Method of Predicting Formation Fracture Pressure Using Image Logging Data

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Embodiment 1

[0021] As a preferred embodiment of the present invention, it discloses a method for predicting formation fracture pressure using imaging logging data. The steps are as follows:

[0022] a. Use imaging logging data to determine the in-situ stress direction of the research block;

[0023] b. Determine the boundary of the finite element simulation geometric model by the direction of the ground stress;

[0024] c. Use linear elastic mechanics theory to establish a finite element simulation mechanical model, and obtain the maximum and minimum horizontal stress of each well point in the research block;

[0025] d. Calculate the formation fracture pressure P of each well point according to the following Heimson formula f :

[0026] P f =3S hmin -3S hmax -P P +T (1);

[0027] In the above formula, S hmax , S hmin Are the maximum and minimum horizontal stress, P P It is the formation pore pressure, which is determined according to the oil test results; T is the tensile strength, which is me...

Embodiment 2

[0029] As the best embodiment of the present invention, it discloses a method for predicting formation fracture pressure using imaging logging data, and the steps are as follows:

[0030] a. Use imaging logging data to determine the in-situ stress direction of the research block; according to the characteristics of borehole stress avalanches and well-wall induced fractures on the imaging log chart, the in-situ stress direction of the research block can be determined. The borehole stress avalanche appears in the imaging log as two black bands that are parallel to each other and separated by 180 degrees, whose orientation is the minimum horizontal principal stress direction. The well wall induced fractures are shown as two symmetrically distributed black bands on the imaging log. They are parallel to the well axis, extend longer, and have a basically stable azimuth; there are small changes in width, but no natural fractures. Dissolution expansion phenomenon; it cuts any feature of ...

specific example

[0038] Take the calculation of the formation fracture pressure of the Jia-2 gas reservoir in a certain structure in the Sichuan Basin as an example to illustrate the specific implementation.

[0039] ①Using imaging logging data to determine the current in-situ stress direction of Jia-2 formation

[0040] The fracture direction of the borehole wall on the imaging log of Well M53 indicates that the maximum horizontal principal stress direction of the formation is 120°-300°, and the current minimum horizontal principal stress direction of the formation is perpendicular to this direction, that is, 30°-210°.

[0041] ② Determine the boundary of the finite element simulation geometric model by the direction of the ground stress.

[0042] Based on the "Bottom Structure Map", a geological and geometric model of the Jialingjiang Formation of a structure in the Sichuan Basin was established. In order to facilitate load application, the boundary of the model is perpendicular or parallel to the l...

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Abstract

The present invention discloses a method for predicting a formation fracturing pressure by utilizing imaging logging information. The method comprises the following steps of: a, determining a crustal stress direction of a research block by utilizing the imaging logging information; b, according to the crustal stress direction, determining a boundary of a finite element simulation geometric model; c, establishing a finite element simulation mechanical model by adopting a linear elastic mechanics theory so as to obtain the maximum horizontal stress and the minimum horizontal stress of a formation of each well point in the research block; and d, according to a Haimson formula, carrying out calculation to obtain the formation fracturing pressure of each well point. By using the method, the technical difficult problems of higher expenditure, difficulty in implementation in the deep formation and difficulty in measuring the formation fracturing pressure of a hydraulic fracturing measurement method in the prior art are solved; and relative to array acoustic logging, a brand new method for predicting the fracturing pressure by utilizing the imaging logging information is provided.

Description

Technical field [0001] The invention relates to a method for predicting formation fracture pressure and belongs to the technical field of logging data evaluation. Background technique [0002] At present, there are two methods for determining formation fracture pressure: hydraulic fracturing measurement method and array acoustic logging data calculation method. For example, the authors Lai Fuqiang, Sun Jianmeng, Su Yuanda, Luo Lin, Yan Ping, Ren Huaijian, etc. are in the journal "Progress in Exploration Geophysics" An article titled "Using Multipole Array Acoustic Logging to Predict Formation Fracture Pressure" was published in the journal, and its publication date is February 2007, Volume 30, Issue 1. In this paper, the elasticity parameters and rock strength parameters of the rock are calculated by using the time difference of the vertical and horizontal waves provided by the processed multipole array acoustic logging data and the rock density logging data. On this basis, the i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
Inventor 谢刚罗利梁从军张树东胡振平
Owner BC P INC CHINA NAT PETROLEUM CORP
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