Oil-gas reservoir fracturing construction method

A construction method and oil and gas reservoir technology, which is applied in the direction of earthwork drilling, production fluid, wellbore/well components, etc., and can solve the problem of discounting fracture stimulation volume and fracturing stimulation effect, and reducing fracture height and support height of far-well fractures and other issues, to achieve the effect of increasing the support height, reducing the drop of the support height, and increasing the diversion capacity

Active Publication Date: 2018-07-24
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0003] The above reasons will greatly reduce the fracture creation height and support height of far-well fractures, greatly reducing the fracture stimulation volume and fracturing stimulation effect
However, the current fracturing technology

Method used

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  • Oil-gas reservoir fracturing construction method
  • Oil-gas reservoir fracturing construction method
  • Oil-gas reservoir fracturing construction method

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Embodiment

[0046] Well A is a tight sandstone well located in the northeast region. The perforated section is 2530-2545 meters, the porosity is 7.2%, the permeability is 0.78md, and the formation pressure is 29.62MPa. According to logging interpretation and triaxial rock mechanics experiments, the Young's modulus of the reservoir is 24600MPa and the Poisson's ratio is 0.24.

[0047] Using the method provided by the present invention, GOFHER software is used to simulate the influence of the reservoir fracturing fluid viscosity, prefluid volume, construction displacement and other factors on the fracture length, fracture width and fracture height at different times ( figure 1 , figure 2 , image 3 ). According to the calculation results, the maximum viscosity of fracturing fluid is 80mPa.s, and the maximum construction displacement is 6m 3 / min. The scale of prefluid volume is 300-400m 3 , The total liquid volume is 800-900m 3 .

[0048] The first stage of fracturing construction is pre-fluid...

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Abstract

The invention belongs to the field of oil exploitation and particularly provides an oil-gas reservoir fracturing construction method. The oil-gas reservoir fracturing construction method comprises a prepad fluid stage and a main sand adding stage. According to the prepad fluid stage, fracturing liquid is injected at multiple levels of construction displacement which is increased level by level from the lowest construction displacement to the highest construction displacement; and according to the main sand adding stage, sand-carried liquid is injected at the highest construction displacement,wherein the lowest construction displacement is 45-65 % of the highest construction displacement. In the preferably-selected implementation mode, design is conducted according to different construction sections, the different fracturing liquid displacement and corresponding fracturing liquid viscosities and using quantities are adopted, the mode of different-particle-diameter variable density sandadding is adopted, by utilizing the setting effect of a supporting agent, the net pressure in cracks at the supporting agent non-setting position is increased, thus the seam making height and the supporting height of remote well cracks are increased, the flow guiding capacity of the cracks at remote wells is improved, and the progressively-decreasing speed of the single-well capacity is decreased.

Description

Technical field [0001] The invention belongs to the technical field of petroleum exploitation, and specifically relates to a fracturing construction method for oil and gas reservoirs that can increase the support height of fractures in remote wells. Background technique [0002] In the current fracturing technology, the support efficiency at the fracture height near the well is relatively high, while the support efficiency for the far well fracture is relatively low. First of all, due to the sedimentation effect of proppant, the farther the well zone is, the greater the horizontal migration distance of the proppant, the greater the vertical settlement height, and the proppant will basically settle in the fracture when it reaches the end of the fracture. Bottom; and the near-wellbore zone is continuously injected with new proppant, so the vertical support efficiency is relatively high. Secondly, the fracture height is also high near the well and low at the far well. When the cra...

Claims

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Application Information

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IPC IPC(8): E21B43/267
CPCE21B43/267
Inventor 蒋廷学周珺路保平王宝峰周林波刘世华
Owner CHINA PETROLEUM & CHEM CORP
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