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A kind of preparation method of thickener for temperature-resistant double network structure fracturing fluid

A network structure and thickening agent technology, applied in the field of oilfield chemicals and fine chemistry, can solve the problems of difficulty in meeting high temperature oilfield fracturing, secondary damage to the formation, loss of application value, etc., and achieve good resistance to external damage, resistance to The effect of improving temperature capacity and strong hydrogen bonding force

Active Publication Date: 2022-03-11
盘锦辽河油田华联实业集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the improved thickener made of plant guar gum has poor temperature resistance, and basically loses its application value above 120°C.
In addition, guar gum itself has a lot of water-insoluble matter, which contains a large amount of residue after the gel is broken, causing secondary damage to the formation, thereby reducing the permeability of the formation, and it is difficult to meet the requirements of fracturing in high-temperature oilfields

Method used

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  • A kind of preparation method of thickener for temperature-resistant double network structure fracturing fluid
  • A kind of preparation method of thickener for temperature-resistant double network structure fracturing fluid
  • A kind of preparation method of thickener for temperature-resistant double network structure fracturing fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A preparation method of a temperature-resistant double network structure fracturing fluid thickener:

[0026] Prepare 5 kinds of thickener samples according to the proportioning ratio of each raw material component in Table 1:

[0027] Table 1, the content ratio of each raw material component of 5 kinds of thickeners

[0028]

[0029] 3 parts of deionized water were added to the reaction system in 3 parts.

[0030] Add the first layer of network functional polymer polyvinyl alcohol formate into 5 reaction kettles respectively, seal and stir in 1 part of deionized water at 93°C for 2 hours, stirring at 450 rpm, and dissolve to obtain a temperature-resistant double network structure fracturing fluid thick Agent first layer network solution.

[0031] After the reactor is cooled to room temperature, add the second part of deionized water to the reactor, stir on a magnetic stirrer for 7 minutes, add the second layer of network non-ionic monomer N-methylolacrylamide to t...

Embodiment 2

[0037] A preparation method of a temperature-resistant double network structure fracturing fluid thickener:

[0038] Prepare 5 kinds of thickener samples according to the proportioning ratio of each raw material component in Table 2:

[0039] Table 2, the content ratio of each raw material component of 5 kinds of thickeners

[0040]

[0041]3 parts of deionized water were added to the reaction system in 3 parts. Add the first layer of network functional polymer polyvinyl alcohol formate into 5 reactors, seal and stir in 1 part of deionized water at 92°C for 2 hours, and dissolve to obtain the first layer of temperature-resistant double network structure fracturing fluid thickener Network solution; wherein, the stirring speed is 460rpm, and the dosage of the first layer network functional polymer is 0.170%, 0.255%, 0.340%, 0.425%, 0.510% of the total mass of reactants.

[0042] After the reaction kettle is cooled to room temperature, add the second part of deionized water ...

Embodiment 3

[0047] This example provides a method for preparing a temperature-resistant double network structure fracturing fluid thickener:

[0048] 3 parts of deionized water were added to the reaction system in 3 parts. Add the first layer of network functional polymer polyvinyl alcohol formate into the reaction kettle, seal and stir in 1 part of deionized water at 92°C for 2 hours, and dissolve to obtain the first layer network solution of temperature-resistant double network structure fracturing fluid thickener ; Wherein, the stirring speed is 400-500rpm, and the dosage of the first-layer network functional polymer is 0.340% of the total mass of reactants.

[0049] After the reactor is cooled to room temperature, add the second portion of deionized water to the reactor, stir on a magnetic stirrer for 6 minutes, add the second layer of network non-ionic monomer N-methylolacrylamide into the reactor, Stir on a magnetic stirrer for 9 minutes to obtain the first layer network solution a...

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Abstract

The invention discloses a method for preparing a thickener for fracturing fluid with a temperature-resistant double network structure. The steps are as follows: first, the first layer of network functional polymer is heated and dissolved in deionized water to obtain the first layer of network solution; the first The layer network functional polymer is a neutral polymer with hydrophilic groups; then, add the second layer network non-ionic monomer and cross-linking agent to the first layer network solution, stir evenly, seal the reaction vessel and ventilate nitrogen protection to obtain an intermediate product; the second layer of network non-ionic monomer is acrylamide; under the protection of nitrogen, add the initiator solution to the intermediate product, stop nitrogen after stirring for 1-3 minutes, and the temperature of the reaction vessel is raised to 58-62 °C, react for 10-15 hours, and obtain a transparent gel-like thickener. The gel-like thickener of the present invention has strong temperature resistance, and has a viscosity of 51 mPa·s after shearing at 200° C. for 1 hour; has high viscosity and thorough gel breaking, and meets the requirements of hydraulic fracturing operations at high temperatures.

Description

technical field [0001] The invention relates to the technical field of oilfield chemicals and fine chemistry, in particular to a method for preparing a thickener for temperature-resistant double network structure fracturing fluid. Background technique [0002] Fracturing technology is an important technical means to improve the production capacity of oil and gas reservoirs and the recovery of oil and gas wells. Fracturing fluid is a key factor affecting the fracturing effect. With the increasing global demand for oil and natural gas and the advancement of oil and gas exploration and development technology, the development of oil and gas resources is constantly developing towards deep, high-temperature, and low-permeability oil and gas reservoirs. With the increasing development of high-temperature and low-permeability oil and gas reservoirs in my country, higher requirements are put forward for the temperature resistance of the fracturing fluid system. Therefore, it is imp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/68C09K8/70C08F261/04C08F220/58C08F222/38
CPCC09K8/68C09K8/685C09K8/70C09K8/882C09K8/887C09K8/92C08F261/04C08F220/58C08F222/385
Inventor 马应娴黄利强郭建春马乐瑶赖杰朱智
Owner 盘锦辽河油田华联实业集团有限公司
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