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A Method for Predicting Initial Productivity of Horizontal Well Volume Fracturing in Tight Oil Reservoirs

A technology for volume fracturing and productivity prediction, which is applied in prediction, data processing applications, instruments, etc., and can solve problems such as incompleteness, inaccurate prediction results, and few parameters to consider

Active Publication Date: 2020-02-07
SOUTHWEST PETROLEUM UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method only considers the influence of engineering parameters on fracturing effect, but does not consider reservoir physical parameters and production dynamic parameters
[0007] None of the above three methods comprehensively consider the differences in reservoir physical properties and primary fracturing operations of each fractured horizontal well at the same time. Each type of factor considers fewer parameters and is not comprehensive enough. Circumstances vary greatly, resulting in inaccurate predictions

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  • A Method for Predicting Initial Productivity of Horizontal Well Volume Fracturing in Tight Oil Reservoirs
  • A Method for Predicting Initial Productivity of Horizontal Well Volume Fracturing in Tight Oil Reservoirs
  • A Method for Predicting Initial Productivity of Horizontal Well Volume Fracturing in Tight Oil Reservoirs

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Embodiment 1

[0070] The reservoir porosity of a tight oil reservoir block is 6.9-13.8%, with an average of 10.5%, the permeability of 0.1-10.2mD, with an average of 1.23mD, the saturation of crude oil is 45.2%, the viscosity of crude oil is 9.05mPa.s, and the depth of the reservoir is 1980m. The formation pressure is 19.6MPa, the formation temperature is 87.5℃, the reservoir physical properties and oil-bearing properties are poor, and the heterogeneity is strong, belonging to tight sandstone reservoirs. The block is developed using large-scale multi-stage multi-cluster volumetric fracturing technology for horizontal wells, and the initial development results vary greatly, with daily oil production ranging from 10.2t / d to 35.7t / d. There are many factors affecting the development effect. It is necessary to analyze the factors affecting the productivity of volume fracturing of horizontal wells, clarify the main controlling factors, predict the initial productivity of volume fracturing of horiz...

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Abstract

The invention discloses a method for predicting compact oil reservoir horizontal well volume fracturing initial productivity, and the method comprises the following steps: 1) establishing a database comprising a sample set, a productivity-affecting subfactor set, and a evaluation index main factor set; 2) establishing a multilevel productivity-affecting factor evaluation system according to the database; 3) utilizing a gray correlation analysis method to calculate weight coefficients of the productivity-affecting subfactors in the multilevel evaluation system, ranking the weight coefficients,and determining productivity-affecting main control factors; 4) utilizing a normal distribution membership function to calculate the membership degree of the productivity-affecting sub-factor of eachfracturing well in sequence, performing blurring operation on the weight coefficients and membership degrees of the productivity-affecting subfactors, quantifying a comprehensive score of a fracturingeffect of each well, dividing intervals for the comprehensive scores, and according to the interval of the comprehensive score of a predicted well, predicting the horizontal well volume fracturing initial productivity. The method provided by the invention improves the accuracy of horizontal well volume fracturing initial productivity prediction, and has an important guiding effect for optimizingfracturing scheme design.

Description

technical field [0001] The invention relates to the field of petroleum and natural gas development, in particular to a method for predicting initial production capacity of horizontal well volume fracturing in tight oil reservoirs during hydraulic fracturing. Background technique [0002] Horizontal well volume fracturing technology is the key technology to realize the shale gas revolution in North America, and it has been widely used in the world. Most of the tight oil reservoirs in my country have the characteristics of poor reservoir physical properties, strong heterogeneity, and low natural productivity. Some of its reservoirs cannot be developed by conventional water injection to form an effective injection-production well pattern, and need to be stimulated to obtain production capacity before they are put into production. In recent years, major oil and gas fields in China have learned from the successful experience of foreign countries in volume transformation, and carri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06Q10/04G06Q10/06G06Q50/06G06F17/16
CPCG06F17/16G06Q10/04G06Q10/0639G06Q50/06
Inventor 郭建春陶亮贺娜曾凡辉陈迟周晓峰
Owner SOUTHWEST PETROLEUM UNIV
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