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An optimization method for fracturing parameters of shale gas horizontal wells

An optimization method, a technology for horizontal wells, applied in earthwork drilling, wellbore/well components, production fluids, etc., can solve problems such as faults and fracture slip predictions that cannot be applied

Active Publication Date: 2020-09-01
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, previous studies used microseismic monitoring as a means, which could only determine the position and time of fault and fracture slippage after hydraulic fracturing, but could not be applied to the prediction of fault and fracture slippage before hydraulic fracturing.

Method used

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  • An optimization method for fracturing parameters of shale gas horizontal wells
  • An optimization method for fracturing parameters of shale gas horizontal wells
  • An optimization method for fracturing parameters of shale gas horizontal wells

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Embodiment 1

[0158] This embodiment provides a method for determining the formation pressure in the fracturing process of a shale gas horizontal well, the determining method comprising the following steps:

[0159] Taking Well Wei 202H3-1 in Weiyuan block as an example, its in-situ stress parameters are vertical in-situ stress gradient of 1.1psi / ft, maximum horizontal in-situ stress gradient of 1.22psi / ft, minimum horizontal in-situ stress gradient of 0.693psi / ft, maximum horizontal in-situ stress gradient The direction of ground stress is 105°.

[0160] According to geophysical prospecting and drilling data, there are four main faults in this area. The azimuth, strike, dip and friction coefficient of 1#-4# faults are shown in Table 1:

[0161] Table 1

[0162] fault X coordinate (Km) Y coordinate (Km) direction(°) Tendency (°) Length (Km) coefficient of friction 1 #

3.60 5.10 30 67.55 4 0.64 2 #

4.37 5.14 70 46.67 4 0.68 3 #

4.27 4...

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Abstract

The invention provides an optimization method for fracturing parameters of a shale gas horizontal well. The optimization method for the parameters includes the steps that a fracturing point and a monitoring point are set correspondingly in two horizontal well sections, with a distance of a hundred meters, of the shale gas horizontal well; the bottom hole pressure of the fracturing point and the monitoring point are obtained respectively; the bottom hole pressure at the fracturing point and the monitoring point is regarded as the formation pressure at the fracturing point and the monitoring point correspondingly, and according to an one-dimensional diffusion model of formation pressure, a diffusion coefficient is obtained; according to the diffusion coefficient, a formation pressure chart of the formation is established; the formation pressure at the fault is determined according to the formation pressure chart of the formation; whether the fault can slip or not is judged according to the Amonton theorem; if slippage occurs, the limit formation pressure of the fault slippage is obtained according to the main ground stress relation of the fault in a critical state; and the safe distance, safe fracturing stable formation pressure and safe fracturing wellhead pressure are obtained according to the limit formation pressure and the formation pressure chart of the fault slippage.

Description

technical field [0001] The invention relates to a method for determining formation pressure during the fracturing process of a shale gas horizontal well, a method for predicting fault slippage and a method for optimizing fracturing parameters, and belongs to the technical field of petroleum exploitation. Background technique [0002] The Sichuan Basin has experienced multiple periods of geological tectonic movements, and the Changning-Weiyuan block has complex geological conditions, developed natural fractures and faults, and strong tectonic stress. The entire Sichuan Basin is dominated by strike-slip faults, and there are reverse faults at the same time. Shear displacement and strike-slip faults are the main structural features of the Sichuan Basin. In the development of shale gas fields in the Weiyuan-Changning area of ​​Sichuan, horizontal well groups and multi-stage hydraulic fracturing are extremely critical means of operation. However, multi-stage large-scale hydraul...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/00E21B43/26
CPCE21B43/26E21B49/006
Inventor 李军赵超杰柳贡慧王超任凯吴志勇
Owner CHINA UNIV OF PETROLEUM (BEIJING)