Shale reservoir horizontal well multi-section fracturing effective fracture half-length calculation method

Abstract

The invention belongs to the technical field of oil reservoir development, and relates to a shale reservoir horizontal well multi-section fracturing effective fracture half-length calculation method. The method comprises the following steps: step 1, collecting mine field day degree data; 2, the flowing bottomhole pressure of the horizontal well is calculated; step 3, calculating material balance time; 4, drawing a relation curve of the regularized pressure and the material balance time; 5, the comprehensive fracture half length of the horizontal well multi-section fracturing fractures is calculated; step 6, monitoring and calculating productivity contribution rates of different fracturing sections by using a tracer agent; and 7, calculating the effective fracture half length of the horizontal well multi-section fracturing. According to the method, the technical thought is clear, production practice is closely combined, the operation steps are clear and reasonable, the accuracy and precision of the obtained fracture half length of the horizontal well multi-section fracturing are high, quantitative evaluation of the fracture half length of the horizontal well multi-section fracturing is achieved, and the defects in the prior art are overcome.

Description

technical field [0001] The invention belongs to the technical field of oil reservoir development, and relates to a method for calculating the half-length of effective fractures in multi-stage fracturing of horizontal wells in shale reservoirs. Background technique [0002] The basic research and field tests of unconventional oil and gas in the past 10 years have effectively promoted the development of China's unconventional oil and gas industry. By effectively learning from technologies such as slick water fracturing and composite fracturing in unconventional oil and gas exploitation in North America, the fractures of the volume fracturing technology have broken through the traditional single tensional fractures, but have the form of initiation and propagation of complex fracture networks, and the form of expression It is not a single opening type failure, but shear failure, dislocation, slip, etc. [0003] Microseismic technology is usually used to detect the distribution ...

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Problems solved by technology

[0003] Microseismic technology is usually used to detect the distribution range and shape of fractures after multi-stage fracturing in horizontal wells, but microseismic events are not equal to the actual fractures opened during hydraulic fracturing. For shale reservoirs with lamination and natural fractures, hydraulic These weak surfaces are easy to be opened during fracturing, and the energy of the microseismic events formed is small, which may easily cause the omission of monitoring and positioning; on the other hand, the microseismic events formed at the far end of the fracturing point may be non-opening or isolated invalid fractures , may lead to misjudgment of hydraulic fracturing scale and fracture distribution. Therefore, the evaluation of hydraulic fracturing effect is of great significance to the fine development of oil and gas fields. It is necessary to improve the reliability and accuracy of fracturing effect evaluation, and then guide multi-stage fracturing of horizontal wells. geoengineering integrated design

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