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Preparation method of modified acrylamide polymer fracturing fluid

A technology of acrylamide and acrylamide cation, which is applied in the field of preparation of modified acrylamide polymer fracturing fluid, can solve the problems of long unblocking time, low pressure bearing strength, and low plugging strength, and achieve shear resistance Good, good temperature and salt resistance, rich in natural resources

Inactive Publication Date: 2021-08-17
陕西万朗石油工程技术服务有限公司
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the commonly used fracturing fluids generally have disadvantages such as long plugging time, low pressure bearing strength, and low plugging strength.

Method used

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  • Preparation method of modified acrylamide polymer fracturing fluid
  • Preparation method of modified acrylamide polymer fracturing fluid

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Embodiment Construction

[0018] In the following, the technical solutions in the present invention will be fully described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the present invention All other embodiments obtained by those skilled in the art without creative efforts, all belong to the protection scope of the present invention.

[0019] Step (1) Preparation of acrylamide cationic dry powder:

[0020] ①Add acrylamide monomer to the aqueous solution, put it in a beaker, add distilled water to dilute to a mass fraction of 1-2%, add hydrogen chloride to it to adjust the pH value to 4-6; ②Blow nitrogen for 15 minutes, add metal ion chelating agent , cosolvent urea, tetrasodium ethylenediaminetetraacetic acid, and stir evenly; ③ Add sodium chloride and acryloylmorpholine as auxiliary additives, stir evenly, continue to pass nitrogen for...

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Abstract

The invention discloses a preparation method of a modified acrylamide polymer fracturing fluid. The preparation method comprises the following steps: (1) preparing acrylamide cation dry powder; (2) preparing a polyacrylamide group; and (3) modifying the surface of the polyacrylamide group. Biopolymer chitosan adopted by the modified acrylamide polymer fracturing fluid has the characteristics of no toxicity, rich natural resources and the like, and molecules of the biopolymer chitosan contain a large amount of hydroxyl, amino and hydroxymethyl, so that the biopolymer chitosan can participate in various reactions; secondly, compared with other fracturing fluids, the fracturing fluid disclosed by the invention is good in shear resistance, and the modified acrylamide polymer fracturing fluid has better temperature resistance and salt resistance by introducing the acrylamide cation dry powder; and the breakthrough pressure and the breakthrough pressure gradient of the modified acrylamide polymer fracturing fluid are both greater than those of common acrylamide polymer fracturing fluid, namely, the modified acrylamide polymer fracturing fluid can block stratums with large pore diameters and high permeability.

Description

technical field [0001] The invention relates to the technical field of oilfield development, in particular to a preparation method of a modified acrylamide polymer fracturing fluid. Background technique [0002] There are many types of oil reservoirs in my country, with different depositional environments, different reservoir physical properties, different reservoir temperatures, different crude oil properties, and ever-changing reservoir water properties. By the end of 2000, the comprehensive water content of oilfields in eastern my country had reached 86.4%, and the recovery rate of recoverable reserves had reached 65.4%. The oilfield production in the middle and late stages of development has entered a stage of total decline. From 1900 to 2000, oilfield production decreased by 1.28 million tons. The Bohai Bay Basin includes six major oilfields: Liaohe, Dagang, Huabei, Shengli, Jidong and Zhongyuan. The oil production in the Bohai Bay Basin has continued to decline for ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/02C08F220/56C08F220/06C08F220/58C09K8/68C09K8/88
CPCC08F220/06C08F220/56C08G81/02C09K8/68C09K8/882C08F220/58
Inventor 王虎彪
Owner 陕西万朗石油工程技术服务有限公司
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