Optimization method for ball throwing temporary plugging steering fracturing of shale gas horizontal well

An optimization method and technology for horizontal wells, applied in design optimization/simulation, earthwork drilling, wellbore/well components, etc., can solve problems such as the optimization method of construction parameters for temporary plugging and fracturing without perfecting the ball

Active Publication Date: 2020-09-08
华美孚泰油气增产技术服务有限责任公司
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Problems solved by technology

However, there are still some problems in the current research: the influence of the wellbore inclination is ignored; t...

Method used

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  • Optimization method for ball throwing temporary plugging steering fracturing of shale gas horizontal well
  • Optimization method for ball throwing temporary plugging steering fracturing of shale gas horizontal well
  • Optimization method for ball throwing temporary plugging steering fracturing of shale gas horizontal well

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Embodiment Construction

[0036] The present invention will be further described below in conjunction with the accompanying drawings.

[0037] An optimization method for shale gas horizontal well throwing temporary plugging and turning to fracturing, including the following steps:

[0038] (1) Analyze the force of the temporary plugging ball when it migrates in the wellbore. There is mainly gravity F G , pressure gradient force F P , resistance F d , additional mass force F m , Basset force F B and the wall effect f W influence, see figure 1 , the model can be used for the migration of temporary plugging balls in the whole wellbore in vertical or horizontal wells through the change of wellbore inclination.

[0039] (2) According to the principle of mechanical balance, the formula of the migration velocity of the temporary plugging ball in the wellbore is established.

[0040]

[0041] in,

[0042] v b Temporary blocking ball moving speed m / s;

[0043] ρ b ρ l Density of temporary pluggi...

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Abstract

The invention discloses an optimization method for ball injection temporary plugging steering fracturing of a shale gas horizontal well, and belongs to the technical field of hydraulic fracturing of oil and gas fields. The method comprises the following steps: (1) analyzing the stress of the temporary plugging ball when the temporary plugging ball moves in a shaft; (2) establishing a migration speed formula of the temporary plugging ball in the wellbore according to a mechanical equilibrium principle; (3) defining a setting factor of the temporary plugging ball as a ratio of drag force to inertia force; and (4) calculating a temporary plugging ball setting factor according to the field construction data, and researching the feasibility of pitching temporary plugging steering construction under the field condition. And when the setting factor of the temporary plugging ball calculated in the step (4) is far greater than 1, the method further comprises the step (5) of calculating the number of the temporary plugging balls, namely optimizing the construction parameters of the temporary plugging balls according to the calculated number of the temporary plugging balls. The step (5). Themethod can be used for optimization design of the ball throwing temporary plugging steering fracturing construction parameters of the shale gas horizontal well, researching factors influencing the plugging effect of the temporary plugging balls, calculating the using number of the temporary plugging balls under different construction conditions, and providing theoretical guidance for on-site construction decisions.

Description

technical field [0001] The invention belongs to the technical field of hydraulic fracturing in oil and gas fields, and mainly relates to an optimization method for shale gas horizontal well throwing balls for temporary plugging and turning to fracturing. Background technique [0002] In recent years, domestic and foreign oil companies have increased their efforts in shale gas exploration and development. The fracturing process of shale gas horizontal wells in the Fuling block adopts a multi-cluster, dense cutting process, and borrows from the ball-throwing temporary plugging and steering fracturing process in repeated fracturing construction to increase the complexity of the fracture network and realize volume fracturing. During the fracturing of shale gas horizontal wells in the Changning and Weiyuan blocks, about 30% of the wells experienced varying degrees of casing deformation. After the casing deformation, the bridge plug pumping-perforation combined operation could not...

Claims

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Application Information

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IPC IPC(8): G06F30/20E21B43/26E21B33/13G06F119/14
CPCG06F30/20E21B43/261E21B43/26E21B33/13G06F2119/14
Inventor 马收刘明明田中政杨红蕾李奕涵
Owner 华美孚泰油气增产技术服务有限责任公司
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