A method of simulating variable fracture in stratum and method of optimizing plugging fluid
A technology for simulating formations and optimizing methods, which is applied in the drilling field and can solve problems such as low reference value of experimental data
Pending Publication Date: 2020-08-25
CHINA UNIV OF PETROLEUM (EAST CHINA) +1
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[0004] The purpose of the present invention is to provide a method for simulating variable fractures in the formation and a plugging fluid to overcome the problem that the variable fractures cannot be accurately simulated in the prior art, resulting in low reference value of experimental data. The optimization method for simulating variable fractures in the formation can more accurately simulate the distribution of fracture openings of variable fractures by establishing a fracture model, which is beneficial to accurately study variable fractures through simulation experiments
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[0038] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.
[0039] The present invention provides a method for simulating variable fractures in formations, such as figure 1 As shown, the formation includes the variable fracture 20 located on the sidewall of the wellbore 19, and the method includes: according to the force and size of the variable fracture 20 in the wellbore 19 and the variable fracture 20 The rock coefficient at is used to establish a fracture model to determine the fracture opening distribution of the variable fracture 20.
[0040] Through the above technical solution, the present invention provides a method for simulating variable fractures in formations and an optimization method for plugging fluid. T...
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The invention relates to the technical field of well drilling, in particular to a method for simulating a variable crack in a stratum and an optimization method of plugging liquid. The stratum comprises the variable fractures (20) located on the side wall of a wellbore (19), and the method comprises the step that a fracture model is established according to the stress and size of the variable fractures (20) in the wellbore (19) and the rock coefficient of the variable fractures (20) so as to determine fracture opening degree distribution of the variable fractures (20). According to the methodfor simulating the variable fractures in the stratum, fracture opening degree distribution of the variable fractures can be simulated more accurately, the variable fractures can be researched accurately through a simulation experiment, and experimental data with higher reference value are provided for actual mining.
Description
technical field [0001] The invention relates to the technical field of drilling, in particular to a method for simulating variable fractures in formations and a method for optimizing lost circulation fluid. Background technique [0002] Lost circulation is one of the technical problems that have plagued drilling engineering for a long time. Its causes are complex and there are many constraints. It is easy to induce complex downhole accidents such as blowout, well collapse and pipe sticking, which seriously restricts the efficient exploration and development of oil and gas resources. Usually, the indoor leak prevention and plugging simulation experiment is carried out through the traditional high temperature and high pressure dynamic leak plugging evaluation instrument, so as to optimize the leak prevention and plugging materials and optimize the construction process. [0003] However, conventional leak prevention and plugging simulation experiments mostly use stainless steel...
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IPC IPC(8): G06F30/20G06Q10/04G06Q10/06G06Q50/02E21B49/00G06F111/10
CPCG06F30/20G06Q10/04G06Q10/06393G06Q50/02E21B49/00G06F2111/10
Inventor 邱正松李佳赵冲钟汉毅黄达全赵欣陈安亮杨一凡黄维安
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)