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Acid liquid drag reducer and preparation method thereof

A production method and technology of drag reducing agent, applied in gas/liquid distribution and storage, pipeline system, mechanical equipment, etc., can solve the problems of temperature limitation, poor acid resistance, formation damage, etc. of drag reducing agent, so as to reduce pump pressure, Good temperature resistance and compatibility, the effect of prolonging the service life

Inactive Publication Date: 2017-12-22
如皋市玉辉助剂厂
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  • Abstract
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AI Technical Summary

Problems solved by technology

In the early stage of foreign research on drag reducers for acids, non-ionic polyacrylamides were mainly used, such as G-11 and G-15 series of BJ Company, FMA-3 of Cardinol Company; Halliburton Company's FR-18, all belong to PAM acid drag reducer, but the acid resistance of PAM polymer is poor
In the mid-1980s, Sichuan developed a series of acid drag reducers such as FR-202, FR-203 and FR-204, which played a role in promoting the development and research of acid drag reducers in China. However, the operating temperature of these drag reducers is limited. There is a great limit, and there are precipitates in high temperature acid, which will cause great damage to the formation

Method used

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  • Acid liquid drag reducer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The preparation of embodiment 1 acid drag reducer BC-131

[0020] (1) Purification of acrylamide (AM) for subsequent use;

[0021] (2) Weigh the monomer 2-acrylamido-2-methylpropanesulfonic acid (AMPS) in a beaker, add 70ml deionized water to dissolve, wherein the mass concentration of AMPS is 14.56%, then add caustic soda, the system Adjust the pH value to 9;

[0022] (3) Add monomer acrylamide (AM) and long-chain cationic monomer (CXDMAAC) to the solution prepared in step (2), and the long-chain cationic monomer is polyalkyldimethylallyl ammonium chloride cation Monomer, where X=14~20, purchased from Chengdu Baichun Petroleum Technology Co., Ltd., the mass ratio of each monomer is AM:AMPS:CXDMAAC=1:1:0.06, then add deionized water to prepare the total monomer The mass concentration is 30% aqueous solution;

[0023] (4) Add the monomer aqueous solution prepared in step (3) into the jar, shake well, and cover the jar tightly with a three-hole rubber stopper (one hole...

Embodiment 2

[0025] Embodiment 2 effect evaluation

[0026] Use the flow loop friction test system to carry out the friction test of the acid liquid drag reducer BC-131 prepared in Example 1, and compare it with the blank acid of 12% (wt), and add For the acid drag reducer BC-131 prepared in Example 1, the mass concentration of the drag reducer is 0.1% (w / v). Select a 6mm pipeline for testing, record the friction pressure drop after passing through the pipeline to calculate the drag reduction rate, evaluate the drag reduction effect of the acid drag reducer according to the drag reduction rate, and the relationship between the drag reduction rate and the flow rate is the largest The resistivity can reach 65%.

[0027] Drag reduction calculation:

[0028]

[0029] In the formula: η----drag reduction rate, %;

[0030] ΔP blank----the pressure difference when the blank acid passes through the test pipeline, MPa;

[0031] ΔP----the pressure difference when the acid liquid containing aci...

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Abstract

The invention discloses an acid liquid drag reducer and a preparation method thereof. The preparation method comprises the following steps: weighing 2-acrylamido-2-methylpropane sulfonic acid monomers in a beaker; adding water for dissolution, and adjusting the system pH value to be 8-10; adding acrylamide monomers and long chain cation monomers; performing stirring under the condition that an inert gas is pumped therein; adjusting the bath temperature to be an initiation reaction temperature, after that, adding an initiator, and enabling a reaction to prepare a transparent gum block; at last, manually cutting the transparent gum block into pieces; performing drying and crushing; and performing screening by use of a 100-mesh screen to prepare the powdery acid liquid drag reducer. The synthetic method is simple, the raw materials are easily accessible, and the cost is lowered; the prepared acid liquid drag reducer has the drag reduction rate up to 65%, pumping pressure and pipeline loss are reduced, and the equipment service life is prolonged; and the acid liquid drag reducer is good in temperature resistance and compatibility, and meanwhile, has a certain retarding effect.

Description

technical field [0001] The invention relates to the field of oilfield chemistry, in particular to an acidic liquid drag reducer and a preparation method thereof. Background technique [0002] In fracturing and acidizing engineering, as the displacement increases, the frictional resistance of the working fluid in the pipeline will increase exponentially, reducing the pumping efficiency; It is difficult to extend forward, the purpose of deep acidification cannot be achieved, and the acidification cannot achieve the desired effect. Therefore, reducing friction is an effective way to increase displacement, improve liquid efficiency and achieve deep acidification. In addition, reducing friction is conducive to prolonging the service life of construction vehicles, pipelines and downhole tools and other equipment. Therefore, the use of additives in acid fracturing, especially the application and demand of drag reducers is increasing. [0003] Many natural high-molecular-weight po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/58C08F226/02F17D1/16
CPCC08F220/56C08F220/58C08F220/585F17D1/16C08F226/02
Inventor 陈修玲
Owner 如皋市玉辉助剂厂
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