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Novel drag reducer for fracturing

A drag reducer and fracturing technology, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of inability to completely inhibit shearing and molecular chain breakage, and achieve good environmental performance, bacterial erosion resistance, good stability effect

Active Publication Date: 2016-08-24
HEILONGJIANG YONGFENG CHEM ADDITIVE CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the existing drag reducer has a fatal weakness. The molecular chain of the drag reducer is broken and degraded by the shear stress generated by the action of pipelines and pipelines at local locations such as elbows or pump stations.
Regardless of increasing the rigid group or forming a large side group to improve the shear resistance of the drag reducer, it cannot completely inhibit the shear.

Method used

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  • Novel drag reducer for fracturing
  • Novel drag reducer for fracturing
  • Novel drag reducer for fracturing

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Embodiment approach

[0042] As a preferred embodiment of the present invention, the vinylbenzocrown ether is selected from 4-vinylbenzo-18-crown-6, 4-vinylbenzo-21-crown-7, 4- One of vinyl benzo-24-crown ether-8. Preferably, the vinylbenzocrown ether is selected from 4-vinylbenzo-21-crown-7 or 4-vinylbenzo-24-crown-8. More preferably, the vinylbenzocrown ether is 4-vinylbenzo-24-crown-8.

[0043]As a preferred embodiment of the present invention, the vinyl benzo crown ether is prepared from raw materials containing 4-vinyl-1,2-benzenediol and chloroglycol compounds.

[0044] The preparation method of described vinyl benzo crown ether is as follows:

[0045] (1) Put the weighed glycol compound into a 250 mL double-necked flask equipped with a reflux condenser, and add excess thionyl chloride and 2-3 drops of DMF. Heat to reflux for 12-18 h, cool to room temperature after the reaction is complete, and use a rotary evaporator to dry the thionyl chloride to obtain chloroglycol compounds.

[0046] ...

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Abstract

The invention provides a novel drag reducer for fracturing and particularly relates to a drag reducer for fracturing fluid in petroleum fracturing construction. Adding a small quantity of novel drag reducer for fracturing in the fluid can reduce flow resistance in the turbulence state. A drag reduction rate can be up to 79.5% and can still keep at 79.4% after 5 hours' high-strength shearing. The novel drag reducer for fracturing is suitable for long-distance transportation.

Description

technical field [0001] The invention relates to a novel drag reducing agent for fracturing, in particular to a fracturing fluid drag reducing agent used in oil fracturing construction. Background technique [0002] Adding a small amount of polymer to the fluid can reduce the flow resistance under turbulent flow. This phenomenon is called polymer drag reduction, and the chemical additives added to reduce the fluid flow resistance are called drag reducers. Drag reducer is a flexible polymer with a molecular weight of more than one million and a linear structure. Adding a small amount of this polymer to the fluid will increase the flow rate and reduce the resistance. Fluid drag reduction by adding drag reducing agent is the most widely used method among many types of drag reduction technologies. [0003] The turbulent drag reduction of polymer is one of the phenomena of technical, economic and scientific significance among all the abnormal phenomena of non-Newtonian flow. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68C09K8/88C08F220/56C08F220/54C08F212/32C08F220/58C08F212/14
CPCC08F220/54C08F220/56C09K8/68C09K8/882C09K2208/28C08F212/32C08F220/585C08F212/14
Inventor 李瑞清
Owner HEILONGJIANG YONGFENG CHEM ADDITIVE CO LTD
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