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Method for predicting formation fracturing pressure by utilizing imaging logging information

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: 2016-01-13
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Abstract
  • Description
  • Claims
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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 for predicting formation fracturing pressure by utilizing imaging logging information

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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 of which are as follows:

[0022] a. Determine the geostress direction of the research block by using imaging logging data;

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

[0024] c. Establish a mechanical model for finite element simulation by using linear elastic mechanics theory, and obtain the maximum and minimum horizontal stresses of formations at 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 respectively, P P is the formation pore pressure, which is determined according to the...

Embodiment 2

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

[0030] a. Using imaging logging data to determine the geostress direction of the research block; the geostress direction of the research block can be judged according to the characteristics of borehole wall stress caving and borehole wall induced fractures on the imaging logging map. Borehole wall stress collapse appears as two black strips parallel to each other and separated by 180 degrees in the image logging diagram, and their orientation is the direction of the minimum horizontal principal stress. Borehole wall induced fracturing fractures appear as two symmetrically distributed black strips on the imaging logging map, they are parallel to the well axis, extend longer, and their orientation is basically stable; the width has a small change, but the kind without natural fractures Dissol...

specific example

[0038] Taking the calculation of formation fracture pressure of the Jiaer gas reservoir in a certain structure in the Sichuan Basin as an example to illustrate the specific implementation method.

[0039] ①Using imaging logging data to determine the current in-situ stress direction of the Jiaer Formation

[0040] The direction of wellbore fractures on the image logging map 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 in the vertical direction, that is, 30°-210°.

[0041] ② The boundary of the geometric model for finite element simulation is determined by the direction of in-situ stress.

[0042] Based on the "Bottom Structural Map", a geological model and a geometric model of the Jialingjiang Formation of a structure in the Sichuan Basin were established. To facilitate the application of loads, the boundaries of the model are perpend...

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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 well 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, authors Lai Fuqiang, Sun Jianmeng, Su Yuanda, Luo Lin, Yan Ping, Ren Huaijian, etc. " published an article titled "Using Multipole Array Acoustic Logging to Predict Formation Fracture Pressure", which was published in February 2007, Volume 30, Issue 1. In this paper, the elastic mechanical parameters and rock strength parameters of the rock are calculated by using the time difference of compressional and transverse waves provided by the processed multipole array acoustic logging data, combined with the rock density logging data, and on this basis, the in-situ stress analysis is carried out to determ...

Claims

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Application Information

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Patent Type & Authority Applications(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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