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Analytical method for predicting drag-reducing property of slick water fracturing fluid by microstructure

A technology of microstructure and analysis method, applied in the direction of using radiation for material analysis, etc., can solve problems such as inability to effectively simulate on-site construction conditions, and the results of drag reduction rate cannot guide field applications well.

Inactive Publication Date: 2018-02-02
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problems in the prior art that indoor laboratories cannot effectively simulate on-site construction conditions, and the measured drag reduction rate results cannot well guide on-site applications.

Method used

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  • Analytical method for predicting drag-reducing property of slick water fracturing fluid by microstructure
  • Analytical method for predicting drag-reducing property of slick water fracturing fluid by microstructure
  • Analytical method for predicting drag-reducing property of slick water fracturing fluid by microstructure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] This example provides a method for evaluating the drag reduction performance of slick water fracturing fluid. The slick water fracturing fluid used is a polymer type slick water fracturing fluid, and the main additive drag reducer is EM64 produced by Jilin Qianyong Company. Polymer drag reducer, the added concentration of drag reducer is 0.05% (volume concentration); Among them, those skilled in the art can reasonably select other components in the slick water fracturing fluid according to the needs of field operations and determine the specific content of other components , other components and their contents have no effect on the drag reduction mechanism analysis method of the present invention.

[0050] The method comprises the following steps:;

[0051] Under the condition of simulating on-site construction flow rate up to 16m / s, the change law of drag reduction rate of slick water fracturing fluid with flow rate was measured, and the relationship curve of correspon...

Embodiment 2

[0062] This example provides a method for evaluating the drag reduction performance of slick water fracturing fluid. The slick water fracturing fluid used is polymer type slick water fracturing fluid, and the main additive drag reducer is 102 type produced by Dongying Jiangyuan Company Polymer drag reducer, the added concentration of drag reducer is 0.05% (volume concentration).

[0063] Under the condition of simulating on-site construction flow rate up to 16m / s, the change law of drag reduction rate of slick water fracturing fluid with flow rate was measured, and the relationship curve of corresponding drag reduction rate of slick water fracturing fluid with flow rate was drawn:

[0064] Among them, the test pipeline of the loop friction test system used is a "U"-shaped pipeline, the length of the straight pipe section is 3m, the length of the curved pipe section is 2m, and the inner diameter of the pipeline is 10.922mm. The power transmission adopts the screw pump.

[0065...

Embodiment 3

[0074] This example provides a method for evaluating the drag reduction performance of slick water fracturing fluid. The slick water fracturing fluid used is a polymer-type slick water fracturing fluid, and the main additive drag reducer is DR800 polymer produced by Shengli Chemical Industry Co., Ltd. Drag reducer, the added concentration of drag reducer is 0.05% (volume concentration).

[0075] Under the condition of simulating on-site construction flow rate up to 16m / s, the change law of drag reduction rate of slick water fracturing fluid with flow rate was measured, and the relationship curve of corresponding drag reduction rate of slick water fracturing fluid with flow rate was drawn:

[0076] Among them, the test pipeline of the loop friction test system used is a "U"-shaped pipeline, the length of the straight pipe section is 3m, the length of the curved pipe section is 2m, and the inner diameter of the pipeline is 10.922mm. The power transmission adopts the screw pump. ...

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Abstract

The invention belongs to the technical field of oil and gas exploitation, and particularly relates to an analytical method for predicting drag-reducing property of slick water fracturing fluid by a microstructure. The analytical method comprises the following steps: sampling slick water fracturing fluid; after sampling, dropwise adding a drop of sample on a hydrophobic membrane; covering the sample with a copper net and adsorbing the sample by using the copper net; taking out the copper net adsorbed with the sample and removing redundant liquid on the periphery of the copper net by suction; drying the sample adsorbed to the copper net at room temperature and then observing the microstructure of the sample; magnifying the dried sample under a microscope by the same multiple and then analyzing the microstructure; classifying the dried samples according to the analysis result; and selecting a representative sample from the classified dried samples and measuring the drug-reducing propertyof the representative sample. The problems that a site construction condition cannot be effectively simulated in an indoor laboratory, and a measured drag reduction efficiency result cannot guide siteapplication well are solved. The drag-reducing property of the slick water fracturing fluid can be evaluated by the analytical method with the aid of the microstructure, and guidance is provided forthe site construction.

Description

technical field [0001] The invention belongs to the technical field of oil and gas exploitation, and in particular relates to an analysis method for predicting the drag reduction performance of slick water fracturing fluid through microstructure. Background technique [0002] Slick water fracturing technology is a new type of fracturing technology developed based on slick water fracturing fluid system, which is widely used in the development of tight reservoirs, especially shale gas reservoirs. The main advantages of the slick water fracturing fluid system include: less reservoir damage, easy flowback, easy formation of mixed volume fracture network, low concentration and low cost. But its most prominent advantage is that it has good drag reduction performance, and only a small amount of drag reducer (0.01%-0.1%) is needed to make the slick water fracturing fluid significantly reduce the construction pump pressure. However, due to its low concentration, it is often necessar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/04
Inventor 刘晓瑞李宪文丁里石华强李宁军李小玲孟磊祖凯王历历丁勇吕小明冯飞沈磊马新星
Owner PETROCHINA CO LTD