Method and device for determining existing stress field before repeated fracturing of shale gas reservoir horizontal well
A shale gas reservoir, refracturing technology, applied in earthwork drilling, wellbore/well components, production fluid, etc., can solve problems such as not considering the influence of fracture interference
Active Publication Date: 2019-05-07
YANGTZE UNIVERSITY
View PDF8 Cites 3 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
At present, researchers at home and abroad obtain the in-situ stress before repeated fracturing of horizontal wells in shale gas reservoirs without taking into account the interference of multi-stage cluster fractures in the initial fracturing of shale and the influence of net pressure distribution in fractures on fracture interference.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0044] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention. In addition, the technical features in each embodiment or a single embodiment provided by the present invention can be combined arbitrarily with each other to form a feasible technical solution, but it must be based on the realization of those skilled in the art. When there is a contradiction or cannot be realized, it should be considered that ...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The embodiment of the invention provides a method and device for determining an existing stress field before repeated fracturing of a shale gas reservoir horizontal well. The method comprises the following steps of: acquiring a main crack interference stress field of a multi-section cluster of a horizontal well, determining an original geostress field according to dynamic parameters and static parameters of rock mechanics, and determining a pore pressure drop interference stress field according to a horizontal well production rule of the shale gas reservoir; superposing the three stress fieldsto obtain the on-site stress field distribution. According to the method and device for determining the existing ground stress field before the repeated fracturing of the shale gas reservoir horizontal well, the main crack interference stress field of the multi-segment cluster under the influence of the net pressure distribution in the crack is considered, the relationship between single well production and the production time is determined, and a pore pressure drop interference stress field is determined. The distribution characteristics of the main cracks of different segments of the cluster can be obtained and the influence of pore pressure drop at different production time periods can be obtained.
Description
technical field [0001] The embodiments of the present invention relate to the technical field of stimulation and transformation of unconventional oil and gas reservoirs, and in particular to a method and equipment for determining the in-situ stress field before repeated fracturing of horizontal wells in shale gas reservoirs. Background technique [0002] The rapid development of staged fracturing technology for horizontal wells has enabled the effective development of shale gas, and its single well production is often characterized by high initial production, rapid decline, and short stable production period. The refracturing technology is an effective means to increase the stable production period of a single shale gas well, reduce the decline rate, and increase the ultimate recoverable resources. Taking the United States as an example, the refracturing operation of about 600 shale oil and gas horizontal wells since 2000 can significantly increase the production of shale oi...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More IPC IPC(8): E21B49/00E21B43/26
Inventor 纪国法
Owner YANGTZE UNIVERSITY