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Acid liquor friction reducer and preparation method thereof

A technology of drag reducer and acid solution, which is applied in the direction of chemical instruments and methods, drilling compositions, etc. It can solve the problems of poor acid resistance, formation damage, temperature limitation of drag reducer, etc., and achieve temperature resistance and compatibility Good, prolonging the service life and reducing the pump pressure

Inactive Publication Date: 2014-05-28
CHENGDU BAICHUN PETROLEUM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 liquor friction reducer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The preparation of embodiment 1 acid liquid drag reducing agent BC-131

[0022] (1) Purification of acrylamide (AM) for use;

[0023] (2) Weigh the monomer 2-acrylamido-2-methylpropanesulfonic acid (AMPS) in a beaker, add 70 ml of deionized water to dissolve, wherein the mass concentration of AMPS is 14.56%, and then add flake alkali to make the system pH adjusted to 9;

[0024] (3) Adding monomer acrylamide (AM) and long-chain cationic monomer (C) to the solution prepared in step (2) X DMAAC), the long-chain cationic monomer is a polyalkyldimethylallyl ammonium chloride cationic monomer, where X=14~20, the purchaser is Chengdu Baichun Petroleum Technology Co., Ltd., and the mass ratio of each monomer is AM:AMPS:C X DMAAC=1:1:0.06, then add deionized water to prepare an aqueous solution with a total monomer mass concentration of 30%;

[0025] (4) Add the monomer aqueous solution prepared in step (3) into the wide-mouthed bottle, shake well, and tightly cover the wid...

Embodiment 2

[0027] Example 2 Effect Evaluation

[0028] Use the flow loop friction test system to carry out the friction resistance test on the acid liquid drag reducer BC-131 prepared in Example 1, and compare it with the 12% (wt) blank acid, add it to the 12% (wt) acid The acid liquid drag reducer BC-131 prepared in Example 1 has a mass concentration of 0.1% (w / v). Select a 6mm pipeline for testing, record the frictional pressure drop after passing through the pipeline to calculate the drag reduction rate, and evaluate the drag reduction effect of the acid liquid drag reducer according to the size of the drag reduction rate. The relationship between the drag reduction rate and the flow rate is as follows: figure 1 , the maximum drag reduction rate can reach 65%.

[0029] Drag reduction rate calculation:

[0030]

[0031] In the formula: η----drag reduction rate, %;

[0032] ΔP 空白 ----The pressure difference when the blank acid passes through the test pipeline, MPa;

[0033] ΔP--...

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Abstract

The invention discloses an acid liquor friction reducer and a preparation method thereof. According to the invention, the preparation method comprises the following steps: weighing monomer 2-acrylamide-2-methylpro panesulfonic acid; placing into a beaker; adding deionized water for dissolution; adding caustic soda flakes to adjust to the pH value of the system to be 8-10; adding monomer acrylamide and long-chain cation monomer; mixing under the condition of supplying an inert gas; adjusting the water bath temperature to be the initiation reaction temperature and adding an initiator; reacting to obtain transparent gelatin blocks; manually cutting the transparent gelatin blocks; drying, smashing, and screening with 100 mesh to obtain powdered acid liquor friction reducer. According to the invention, the synthesis method is simple, the raw materials are easy to obtain, and the cost is lowered; the acid liquor friction reducer prepared by the invention has a friction reducing rate as high as 65%, the pump pressure is reduced, the pipe line loss is reduced, and the service life of equipment is prolonged; the acid liquor friction reducer is good in temperature tolerance and compatibility, and has a certain speed reducing effect.

Description

technical field [0001] The invention relates to the field of oilfield chemistry, in particular to an acid liquid drag reducing agent and a preparation method thereof. Background technique [0002] In the fracturing and acidizing project, with the increase of displacement, the frictional resistance of the working fluid in the pipeline will increase exponentially, reducing the pumping efficiency; at the same time, the frictional resistance increases, the displacement is difficult to increase, and the cracks are very It is difficult to extend forward, the purpose of deep acidification cannot be achieved, and 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 beneficial to prolong the service life of construction vehicles, pipelines and downhole tools. Therefore, the use of additives in acid fracturing, especially t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/74
CPCC09K8/74C09K8/725C09K8/882C09K2208/28
Inventor 刘通义戴秀陈光杰魏俊谭坤赵众从林波黄趾海张立丰陈江明兰昌文于毅
Owner CHENGDU BAICHUN PETROLEUM TECH
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