Method for designing strength of fluid for tight sandstone sand fracturing

A sand fracturing and tight sandstone technology, which is applied in the field of oil and gas reservoir exploration and development, can solve the problem that the fracture length cannot be further increased, and achieve the effect of avoiding excessive stimulation

Pending Publication Date: 2021-10-01
PETROCHINA CO LTD
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  • Application Information

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Problems solved by technology

The length of the hydraulic fracturing fracture is positively correlated with the fluid intensity. However, due to the influence of fluid loss, there is an upper limit for the fra

Method used

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  • Method for designing strength of fluid for tight sandstone sand fracturing
  • Method for designing strength of fluid for tight sandstone sand fracturing
  • Method for designing strength of fluid for tight sandstone sand fracturing

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Experimental program
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Embodiment

[0028] This embodiment provides the detailed calculation process of each parameter and equation required by the method.

[0029] The first is the calculation of the fluid loss coefficient of the fracturing fluid. The fluid loss of fracturing fluid is controlled by two processes, namely fluid viscosity and formation fluid compressibility, such as figure 1 shown.

[0030] In the fluid loss zone, the porosity and permeability are not a constant, but a hyperbolic decreasing relationship, which decreases rapidly with increasing depth until the far-well zone becomes the original porosity and permeability. Therefore, the fluid loss coefficient controlled by viscosity in the fluid loss zone cannot be calculated according to the method of constant value of porosity and permeability.

[0031]Assuming that the fluid loss depth at the fracture unit i is Li, the fluid loss area is divided into Mi units, such as figure 2 shown.

[0032] According to the classical fluid loss theory, the...

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Abstract

The invention discloses a method for designing the strength of fluid for tight sandstone sand fracturing, which relates to the technical field of exploration and development of oil and gas reservoirs. The method comprises the following steps that S1, an overall construction object is divided into a plurality of design objects, a crack quasi-three-dimensional extension model is established for each design object, wherein the specific step of model establishment comprises the substeps that reservoir parameters and engineering design parameters of the independent design objects are collected; according to the reservoir parameters and the engineering design parameters of the design object, quasi-three-dimensional fracture extension calculation is carried out, a fracture quasi-three-dimensional extension model of the design object is obtained, and the process of the quasi-three-dimensional fracture extension calculation comprises calculation of a fracturing fluid filtration coefficient; after all the quasi-three-dimensional extension models of the whole construction object are established, a series of correlation curves of the design scale, the used liquid strength and the seam length are obtained, and the reasonable used liquid strength is optimized and designed according to the obtained correlation curves of the used liquid strength and the seam length.

Description

technical field [0001] The invention relates to the technical field of exploration and development of oil and gas reservoirs, and further relates to a method for designing the strength of fluid used for fracturing of tight sandstone and sand. Background technique [0002] In recent years, the proportion of exploration and development of tight sandstone reservoirs has increased year by year, and the matrix permeability of tight sandstone reservoirs is low, so sand fracturing must be performed. However, tight sandstone reservoirs often have strong inter-segment heterogeneity and severe water sensitivity, so the scale of fluid use should be controlled under the premise of meeting the stimulation requirements as much as possible. The length of the hydraulic fracturing fracture is positively correlated with the fluid intensity. However, due to the influence of fluid loss, there is an upper limit for the fracture length under a certain water horsepower for single-stage reconstruct...

Claims

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Application Information

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IPC IPC(8): G06Q50/02G06F30/23G06F119/14
CPCG06Q50/02G06F30/23G06F2119/14
Inventor 周长林方鸿铭张华礼段国彬葛枫曾冀刘飞王晓娇唐波涛叶颉枭
Owner PETROCHINA CO LTD
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