Method for calculating repetitive fracturing crack opening pressure of shale gas horizontal well

Abstract

The invention discloses a method for calculating the repetitive fracturing crack opening pressure of a shale gas horizontal well. The method comprises the following steps that S1, logging data is utilized to calculate the minimum horizontal main stress of an original stratum; S2, a primary fracturing crack induction stress model of a vertical cracked well is established, and a primary fracturing crack induction stress is calculated; S3, well bottom pressure measurement and gas producing profile testing are utilized to calculate the yield contributions of perforation clusters, and the stressescaused by well section pressure depletions corresponding to the perforation clusters are calculated; S4, the displacement, casing pipe diameter, measure fluid density and other parameters are utilizedto calculate streamwise fiction; S5, the four types of forces are comprehensively superposed to calculate the redistribution situation of the stresses along a horizontal well shaft. The method has the fundamental guidance significance in repetitive fracturing process optimization, parameter optimization and site construction of the shale gas horizontal well and has the cost-reducing and effect-improving space on the aspects such as construction fluid quantity optimization, sand adding scale optimization and ground truck group power optimization.

Description

technical field [0001] The invention relates to a calculation method for opening pressure of repeated fracturing fractures of shale gas horizontal wells. Background technique [0002] Shale gas, as a natural gas resource with rich resources and broad development prospects, has achieved rapid development in China in recent years. However, because shale gas reservoirs are different from conventional sandstone, carbonate rock and other gas reservoir types, the production capacity declines rapidly, and the production of some wells has approached the lower limit of economic production. There is an urgent need for technical methods to restore and improve single well production capacity to improve ultimate recovery. rate, to realize economical and efficient development of shale gas fields. [0003] Judging from the practical experience at home and abroad, refracturing is an effective method to solve the above problems. Domestic shale gas horizontal wells have long horizontal sect...

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Problems solved by technology

[0004] Domestic shale gas development time is relatively short, and field practice in refracturing has not yet been carried out, and there is no public report on the calculation method of refracturing fracture opening pressure

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