Drag reducer as well as preparation method and application thereof

A technology of drag reducer and polyether polyol, which is applied in the direction of chemical instruments and methods, drilling compositions, bulk chemical production, etc., can solve the problems of difficult construction, easy gas channeling, strong filter loss, etc., and achieve The effect of good solubility

Active Publication Date: 2020-04-17
RES INST OF SHAANXI YANCHANG PETROLEUM GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Carbon dioxide fracturing can significantly increase the complexity and expansion orientation of fractures around the wellbore. However, due to the low viscosity and strong filter loss of carbon dioxide itself, the requirements for the displacement of carbon dioxide fracturing are relatively high. High frictional resistance, about 1.5 times that of guar gum fracturing fluid, leads to high wellhead pressure during on-site construction, difficult construction, less sand-carrying, easy gas channeling, easy leakage and unsatisfactory production stimulation effect in actual field application, etc. The problem is that the construction displacement cannot meet the design requirements, so it is urgent to develop a drag reducer suitable for liquid carbon dioxide fracturing fluid

Method used

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  • Drag reducer as well as preparation method and application thereof
  • Drag reducer as well as preparation method and application thereof
  • Drag reducer as well as preparation method and application thereof

Examples

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Embodiment 1

[0029] This embodiment provides a drag reducer for reducing resistance during liquid carbon dioxide fracturing, which is prepared through the following steps.

[0030] Preparation of polyether polyol: tetrahydrofuran and propylene oxide are catalyzed by ring-opening polymerization, and a tetrahydrofuran-propylene oxide copolymer diol with a molecular weight of 2000 is obtained through processes such as neutralization, water washing, dehydration and filtration.

[0031] The tetrahydrofuran-propylene oxide copolymer diol and polydimethylsiloxane with a viscosity of 8000 are mixed in a mass ratio of 5:2 to make them uniformly mixed.

[0032] Prepare polylauryl methacrylate by following the following steps:

[0033] Dissolve 40 mL of lauryl methacrylate and 22 mL of divinylbenzene in 87 mL of N,N-dimethylformamide to obtain a mixed solution;

[0034] Dissolve 2g-4g of azobisisobutyronitrile in 38mL of absolute ethanol, add dropwise to the mixed solution under constant stirring, and heat to ...

Embodiment 2

[0038] When performing carbon dioxide fracturing with water, the pressure difference between the inlet and outlet of the pipeline is 0.73Mpa. After adding the drag reducer of Example 1, the pressure difference between the inlet and the outlet is reduced to 0.27Mpa, and the drag reduction rate exceeds 55. %, reaching 63.1%.

[0039] This embodiment is used for oil and natural gas drilling operations. In the process of fracturing, the mass ratio of the added drag reducer to the mass ratio of carbon dioxide is 0.3%-0.5%, which can reduce the drag before introducing the carbon dioxide Add the agent to the pipeline. The drag reducer in supercritical CO 2 In the process of fracturing, the drag reduction rate can reach up to 63%, and it can be degraded by water / hydrocarbons, or can flow back quickly after being compressed, to prevent formation retention and cause damage. At the same time, drag reducers and liquid CO 2 It has good solubility and can form a uniform mixed solution within 2...

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Abstract

The invention provides a drag reducer as well as a preparation method and an application thereof. The drag reducer is prepared from the following raw materials: polyether polyol, polydimethylsiloxaneand lauryl polymethacrylate. The mass ratio of the polyether polyol to the polylauryl methacrylate is 1:1-6: 1, and the volume ratio of the solution of the polyether polyol containing the polylauryl methacrylate to the polydimethylsiloxane is 2:1-4:1. The drag reducer provided by the invention can effectively solve the problem of large resistance in a supercritical carbon dioxide fracturing process under the condition that the viscosity of supercritical carbon dioxide is not obviously increased.

Description

Technical field [0001] The invention relates to a drag reducer, in particular to a drag reducer which can reduce the resistance of liquid carbon dioxide during liquid carbon dioxide fracturing, and belongs to the technical field of petroleum exploitation. Background technique [0002] Carbon dioxide fracturing can significantly increase the complexity and expansion of fractures around the wellbore. However, due to its low viscosity and strong fluid loss, carbon dioxide fracturing requires a higher discharge rate. At the same time, liquid carbon dioxide is more expensive than traditional water-based fracturing fluids. The friction resistance is high, which is about 1.5 times that of the guar gum fracturing fluid, resulting in excessively high pressure at the wellhead of the site construction. In the actual application, the construction is difficult, the sand carrying is small, the gas channeling, the leakage and the increase effect are not ideal, etc. The problem is that the const...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/60C09K8/68C09K8/88C08F220/18C08F212/36C08G65/06C08G65/20
CPCC08F220/18C08G65/06C08G65/20C09K8/604C09K8/68C09K8/882C09K8/885C09K2208/28Y02P20/54
Inventor 孙晓徐泉田守嶒穆景福郭兴王海柱
Owner RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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