Method for evaluating yield-improving reconstruction volume on the basis of fracturing construction pressure

A technology for transforming volume and pressure, which is applied in special data processing applications, instruments, electrical digital data processing, etc., and can solve the problems of limited large-scale application, non-promotable, large differences, etc.

Inactive Publication Date: 2018-11-16
SOUTHWEST PETROLEUM UNIV
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  • Description
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Problems solved by technology

Among them, the microseismic method is more reliable, but the cost of microseismic testing and tiltmeter testing is high, the economy is poor, and large-scale applications are limited
Due to the assumed conditions, the discrete fracture network simulation method has a large difference between the actual calculation and the simulated calculation results, so it is not generalizable

Method used

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  • Method for evaluating yield-improving reconstruction volume on the basis of fracturing construction pressure
  • Method for evaluating yield-improving reconstruction volume on the basis of fracturing construction pressure
  • Method for evaluating yield-improving reconstruction volume on the basis of fracturing construction pressure

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Embodiment

[0145] The X well section in a shale development demonstration area in Southwest my country was selected. The vertical depth of the horizontal well was 4276m, the horizontal section was 800m long, the effective thickness was 32m, and the formation fluid pressure was 42MPa. According to the analysis of core experiments, the horizontal and vertical permeability are 2.1×10 -3 μm 2 , 4.9×10 -3 μm 2 , 2.8×10 -3 μm 2 , the comprehensive compressibility coefficient of rock is 1×10 -4 MPa -1 The vertical and horizontal principal stresses are 145MPa, 121.6MPa, and 105.0MPa respectively; the natural crack cohesion is 17.5MPa, the internal friction angle is 25°, and the intersection angle is 20°; the average tensile strength is 6.56MPa. Now use φ177.8δ12.65 bare casing, slippery water fracturing fluid (flow pattern index 1.0, drag reduction rate 70%) divided into 15 sections, 3 clusters, fracture cluster spacing 15m; effective perforation holes 20 holes, aperture φ12 ; The pre-seq...

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Abstract

The invention belongs to the technical field of oil and gas field exploration and development hydraulic fracturing, and relates to a method for evaluating yield-improving reconstruction volume on thebasis of fracturing construction pressure. The method comprises the following steps that: S1: collecting target well stratum geological and engineering parameters and fracturing construction basic parameters; S2: establishing a fracturing pipe string flowage friction calculation equation, and adopting a fluid mechanics method to carry out calculation to obtain flowage friction; S3: on the basis ofthe fracturing construction parameters, calculating evelet friction and near well bending friction; S4: on the basis of pressure balance in a fracturing pipe column, calculating fracturing real-timewell bottom pressure; S5: on the basis of tension fracture and shear fracture pressure, calculating critical pressure; S6: on the basis of a well bottom pressure number, judging yield-improving reconstruction volume expansion effectiveness; and S7: on the basis of an injection process fluid linear diffusion equation, calculating a yield-improving reconstruction impact scope. The method has the beneficial effects that the volume reconstruction impact scope and the SRV (Stratum Reconstruction Volume) are obtained through calculation so as to be economic and reliable, and therefore, the method fills up the blank of the real-time evaluation of the yield-improving reconstruction volume by the fracturing construction in the prior art.

Description

technical field [0001] The invention relates to a method for real-time evaluation of stimulation volume based on fracturing construction pressure, and belongs to the technical field of hydraulic fracturing for oil and gas field exploration and development. Background technique [0002] In recent years, as the shale gas revolution has achieved great success in North America, my country is also accelerating the pace of shale gas development. In October 2015, the China International Mining Conference announced that my country became the third country to achieve commercial shale gas development after the United States and Canada. Four major shale gas production areas, Fuling, Changning, Weiyuan and Yanchang, have been formed. In 2015, my country's shale gas production was 4.471 billion cubic meters, reflecting broad development prospects. Due to the poor gas supply capacity of the shale reservoir matrix to fractures, it is difficult to achieve the expected stimulation effect o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 胡永全赵金洲胡若菡刘通义
Owner SOUTHWEST PETROLEUM UNIV
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