Optimization method for fracturing parameters of shale gas horizontal well
An optimization method and technology for horizontal wells, which can be used in earth-moving drilling, wellbore/well components, production fluids, etc., and can solve problems such as faults and fracture slip prediction that cannot be applied
Active Publication Date: 2018-09-04
CHINA UNIV OF PETROLEUM (BEIJING)
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[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.
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Embodiment 1
[0158] This embodiment provides a method for determining the formation pressure during the fracturing process of a shale gas horizontal well. The method includes 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 1.1 psi / ft, maximum horizontal in-situ stress gradient 1.22 psi / ft, minimum horizontal in-situ stress gradient 0.693 psi / ft, and maximum horizontal The direction of ground stress is 105°.
[0160] According to the geophysical prospecting and drilling data, there are mainly four faults in this area. The azimuth, strike, tendency and friction coefficient of the 1#-4# fault are shown in Table 1:
[0161] Table 1
[0162] Fault
X coordinate (Km)
Y coordinate (Km)
Trend (°)
Inclination (°)
Length (Km)
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
4.37
35
76.86
4
0.61
4#
4.18
3.90
353
72.92
4
0.69
[0163] The horizontal well group has a well depth of...
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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 in a shale gas horizontal well fracturing process, a method for predicting fault slip and an optimization method for fracturing parameters, and belongs to the technical field of oil exploitation. Background technique [0002] The Sichuan Basin has experienced multiple stages of geological tectonic movement. The Changning-Weiyuan block has complex geological conditions, with developed natural cracks and faults, and strong tectonic stress. The entire Sichuan Basin is dominated by strike-slip faults and reverse faults. Shear displacement and strike-slip faults are the main structural features of the Sichuan Basin. During the development of shale gas fields in Weiyuan-Changning, Sichuan, horizontal well groups and multi-stage hydraulic fracturing are extremely critical operation methods. However, multi-stage large-scale hydraulic fracturing will induce sharp changes in the nearby ground stre...
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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)