Microcapsule gel breaker and preparation method thereof

A technology of microcapsules and gel breakers, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems that have not entered the field application and industrial production, the process operation is complicated and difficult to control, and the particle sphericity is low. Achieve good sphericity, reduce production cost, and uniform particle size distribution

Inactive Publication Date: 2016-06-08
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the equipment cost is too high, the operation of the equipment is difficult, the process operation is complicated and difficult to control, the sphericity of the particles is low, and the coating materials are often artificially synthesized polymers, which bring problems to environmental protection.
In addition to physical methods and chemical methods, most of these methods are still in the indoor research stage, and have not entered the field application and industrial production.

Method used

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  • Microcapsule gel breaker and preparation method thereof
  • Microcapsule gel breaker and preparation method thereof
  • Microcapsule gel breaker and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The microcapsule gel breaker described in this embodiment is mainly composed of ammonium persulfate as the core material, ethyl cellulose as the clothing material, and an aqueous plant glue solution as the protective agent. In terms of mass percentage, the mass ratio of the core material to the clothing material is 2 :1~1:4. Wherein, the vegetable gum aqueous solution is a gelatin aqueous solution with a concentration of 1% to 2% by mass.

[0039] The preparation method of this microcapsule breaker, such as figure 1 Shown, and in conjunction with the following specific examples the present invention will be further described.

[0040] (1) Weigh 2g of ethyl cellulose and 4g of ammonium persulfate solid powder, and control the volume ratio of dichloromethane to distilled water to be 1:5; take a 500ml beaker and prepare the mass fraction with distilled water in a warm water bath at 40°C 2% gelatin solution, and keep it warm for later use;

[0041] (2) Measure an appropr...

Embodiment 2

[0047] The present embodiment carries out corresponding performance index test to the prepared ammonium persulfate capsule gel breaker, and concrete test item is as follows:

[0048] (1) Determination of appearance and morphology: the surface of the microcapsules was scanned by spraying gold at room temperature with a scanning electron microscope to obtain a morphology map.

[0049] The appearance of the sample ammonium persulfate capsule gel breaker is shown in the scanning electron microscope image, such as figure 2 shown. Depend on figure 2 It can be clearly seen that the surface of ammonium persulfate microcapsules is round and smooth, and there are very few microporous channels on the surface that can be used for the release of core materials, which is more in line with industry requirements.

[0050] (2) At the same time, under room temperature conditions, the ammonium persulfate microcapsule sample of the embodiment is sliced, and the ammonium persulfate microcapsul...

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Abstract

The invention discloses a microcapsule gel breaker. The microcapsule gel breaker is mainly prepared from ammonium persulfate as the core material and ethyecellulose as the wrapper material according to the mass ratio of 2:1 to 1:4 by mass percentage in a gelatine water solution as the protective agent. The preparation method specifically includes the steps of firstly, weighing and preparing raw materials; secondly, preparing a wrapper material solution; thirdly, adding the core material to prepare an S/O suspension system; fourthly, adding the protective agent in the suspension system to prepare an S/O/W composite emulsification system; fifthly, separating a microcapsule, and conducting suction filtration, washing and drying. The microcapsule gel breaker has the advantages of high sphericity, uniform granularity, high effective content, slow-release gel breaking property and the like; gelatine (guanidine gum) fracturing fluid can be effectively broken under ideal conditions during fracture construction; few devices are used in the preparation method, device and investment cost is reduced, and operation is easy; the required raw materials are wide in source and easy to obtain, and a foundation is laid for application and popularization of the microcapsule gel breaker in water base fracture work.

Description

technical field [0001] The invention relates to the technical field of petroleum and natural gas exploration and development, in particular to a microcapsule gel breaker and a preparation method thereof. Background technique [0002] Fracturing fluid is an important part of fracturing technology and one of the main measures to increase production and injection of oil and gas wells. Fracturing fluid is used for creating fractures and carrying sand. Therefore, it is required to have a high viscosity during construction operations to ensure that the proppant can enter the fractures smoothly and avoid blocking the pores and channels of the wellbore and fractures; The fracturing fluid has little damage to the formation, is resistant to temperature, salt, and shear, and does not pollute the reservoir. [0003] As the exploration and development of oil and gas fields become more and more difficult, although new fracturing fluids such as high-temperature resistant clean fracturing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/66C09K8/70
CPCC09K8/665C09K8/706C09K2208/26
Inventor 王煦卿方利樊乙均余佳妍代家兴李和松
Owner SOUTHWEST PETROLEUM UNIV
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