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Fracturing liquid system with small friction resistance and good sand suspension

A fracturing fluid and suspended sand technology, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of increasing the friction of fracturing fluid and pipe strings, reducing the fluid delivery efficiency, etc., and achieve good suspension of sand , Excellent sand suspension performance, low cost effect

Inactive Publication Date: 2019-04-26
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, most oilfields use the method of increasing the viscosity of fracturing fluid to improve the sand suspension performance of fracturing, but this method often increases the friction between the fracturing fluid and the pipe string, thereby reducing the fluid delivery efficiency

Method used

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  • Fracturing liquid system with small friction resistance and good sand suspension
  • Fracturing liquid system with small friction resistance and good sand suspension
  • Fracturing liquid system with small friction resistance and good sand suspension

Examples

Experimental program
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Effect test

Embodiment 1

[0027] In this example, four monomers, acrylamide, acrylic acid, 4-isopropenylcarbamoyl-benzenesulfonic acid and dimethyl octadecyl ammonium chloride, are used in a weight ratio of 78:19:2:1 Initiate polymerization at 10°C, and obtain a copolymer after polymerization for 8 hours, then shred the copolymer, dry it at 55°C, and finally pulverize it to pass through a 60-mesh sieve to obtain a polymer thickener powder. The polymer thickener is prepared into a 0.3wt% solution, and 0.015wt% sodium lauryl sulfate is added, and the fracturing fluid is obtained after fully stirring.

[0028] The sand ratio is fixed at 20%, and the 20 / 40 mesh proppant is slowly mixed with the polymer fracturing fluid under the condition of a displacement of 1m3 / min, and the dynamic suspension of the fracturing fluid is tested with a large-scale visual flat-plate fracture simulation system. Sand capacity, migration and placement of 20 / 40 mesh proppant are as follows figure 1 and figure 2 shown. From ...

Embodiment 2

[0030] In this example, the four monomers of acrylamide, acrylic acid, 4-isopropenylcarbamoyl-benzenesulfonic acid and DM-22 are used to initiate polymerization at 20°C in a weight ratio of 80:15:3:2, and after 10 hours of polymerization, the obtained Copolymer, then shred the copolymer, dry it at 55°C, and finally pulverize it to pass through a 250-mesh sieve to obtain polymer thickener powder. Next, the polymer is formulated into a 0.3wt solution, and 0.015wt% sodium lauryl sulfate is added, and the fracturing fluid is obtained after fully stirring.

[0031] The sand ratio is fixed at 20%, and the 30 / 50 mesh proppant is slowly mixed with the polymer fracturing fluid under the condition of a displacement of 1m3 / min, and the dynamic suspension of the fracturing fluid is tested with a large-scale visual flat-plate fracture simulation system. Sand capacity, migration and placement of 30 / 50 mesh proppant are as follows image 3 and Figure 4 shown. From image 3 and Figure ...

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Abstract

The invention discloses a fracturing liquid system with small friction resistance and good sand suspension. The fracturing liquid system comprises the following components in percentage by mass: 0.1-0.3wt% of a polymer thickening agent, 0.015-0.02wt% of a surfactant cross-linking agent, 0.04-0.08wt% of a gel breaker and the balance of water, wherein the polymer thickening agent is prepared from acrylamide, acrylic acid, a rigid monomer and a cationic hydrophobic monomer in a weight ratio of (75-80):(15-20):(2.0-5.0):(1.0-3.0) through polymerization; the polymerization temperature is 10-30 DEGC; the polymerization time is 8-10 hours. By adopting a fracturing liquid of the fracturing liquid system, the technical problems that a conventional fracturing liquid is large in friction resistanceand poor in sand suspension in the pumping process are solved.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field development, and in particular relates to a fracturing fluid system with small frictional resistance and good sand suspension. Background technique [0002] With the development of the oil and gas industry, the proportion of low permeability reservoirs in the total oil and gas resources is increasing. In order to successfully develop these unconventional oil and gas resources, oil and gas reservoirs must be stimulated. Hydraulic fracturing is a technique widely used to stimulate production of low permeability oil and gas wells. As an indispensable part of fracturing technology, the performance of fracturing fluid determines the success or failure of fracturing construction and the effect of oil and gas stimulation. Generally speaking, the proppant is carried into the formation by the fracturing fluid to support the artificial fracture, so that after the construction is completed, the f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/60C09K8/68C09K8/88
CPCC09K8/602C09K8/685C09K8/882C09K8/887C09K2208/28
Inventor 毛金成张阳林冲毛金桦杨小江
Owner SOUTHWEST PETROLEUM UNIV
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