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

A technology of repeated fracturing and cracking pressure, which is applied in calculation, production fluid, earthwork drilling and production, etc. It can solve the problems of short shale gas development time and no public reports on calculation methods

Active Publication Date: 2018-11-23
CHINA PETROLEUM & CHEM CORP +1
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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 be

Method used

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

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specific Embodiment

[0213] Jiaoye 4HF horizontal section is 1174.5m long, fracturing 15 sections / 43 clusters, and the average single-stage liquid volume for the initial stimulation is 1613m 3 , single-stage sand volume 45m 3 , the reconstruction scale is lower than that of adjacent wells, and the production and pressure drop rapidly after being put into production. Considering the length of the horizontal section and the number of clusters, it is representative, so this well is selected as a typical well for design. Through the above calculation method, the fracture opening pressure corresponding to each perforation cluster can be obtained when the Jiaoye 4HF well is refractured, as shown in Table 1.

[0214] Table 1 Opening pressure of refractured fractures in Well Jiaoye 4HF

[0215]

[0216]

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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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Application Information

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IPC IPC(8): E21B47/06E21B43/26G06F17/50
CPCE21B43/26E21B47/06G06F30/20Y02T90/00
Inventor 李少明李奎东刘炜陈建达肖佳林唐芳胡韵王瑞晨
Owner CHINA PETROLEUM & CHEM CORP
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