Low-friction-resistance high-temperature-resistant gelled acid and preparation method thereof

A thickening acid, high temperature technology, applied in chemical instruments and methods, drilling compositions and other directions, can solve the problems of low viscosity of thickening acid, increase construction cost, poor temperature resistance, etc., achieve simple preparation method, The effect of reducing production cost and excellent temperature resistance

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

However, most of the thickeners currently used in various oil fields require more time to be prepared on site, which increases the construction cost. The thickened acid prepa...

Method used

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  • Low-friction-resistance high-temperature-resistant gelled acid and preparation method thereof
  • Low-friction-resistance high-temperature-resistant gelled acid and preparation method thereof
  • Low-friction-resistance high-temperature-resistant gelled acid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1. Synthesis of thickener

[0027] (1) Purify acrylamide (AM) for later use.

[0028] (2) Weigh the monomer 2-acrylamido-2-methylpropanesulfonic acid (AMPS) in a beaker, add deionized water to dissolve, make the mass fraction of AMPS 40%, add caustic soda, make the system pH 8-10; then add other monomers acrylamide (AM), dimethyldiallylammonium chloride (DMDAAC) and long-chain cationic monomer (C X DMAAC), the long-chain cationic monomer is polyalkyl dimethyl allyl ammonium chloride, where X is 14-20; its production plant is Chengdu Baichun Petroleum Technology Co., Ltd. The mass ratio of various monomers is AM:AMPS:DMDAAC:CDMDAAC=2:2:1:0.12, adding deionized water to prepare an aqueous solution with a mass fraction of 30% of the total monomers;

[0029] (3) Add the monomer solution prepared in (2) into a 250ml wide-mouth bottle, shake well, and cover tightly with a three-hole rubber stopper (one hole is an air guide tube, one hole is a vent tube, and the other hole i...

Embodiment 2

[0032] Embodiment 2 effect evaluation

[0033] 1. Friction drop test

[0034] The thickened acid prepared in Example 1 was tested for friction reduction by using a flow loop friction test system, and compared with blank acid. The 8mm pipeline is selected for testing, and the drag reduction rate is calculated by recording the friction pressure drop after passing through the pipeline, and the drag reduction effect of the prepared thickened acid is evaluated according to 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 57%.

[0035] Drag reduction calculation:

[0036]

[0037] In the formula: η----drag reduction rate, %;

[0038] ΔP 空白 ----The pressure difference when the blank acid passes through the test pipeline, MPa;

[0039] ΔP----the pressure difference when different concentrations of thickened acid pass through the test pipeline, MPa.

[0040] 2. Rheolo...

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Abstract

The invention discloses a low-friction-resistance high-temperature-resistant gelled acid and a preparation method thereof. The method comprises the following steps: 2-acrylamide-2-methylpro panesulfonic acid is dissolved into deionized water, and caustic soda flakes are added, so as to enable the pH value of a system to be 8-10; monomer acrylamide, dimethyl diallyl ammonium chloride and long-chain cationic monomer are added, and then deionized water is added again to prepare into an aqueous solution with the mass percent of total monomers of 25-30%; inert gas is fed in, an initiator is added, and reaction is performed, so that a gelling agent is prepared; a beaker is filled with water, and hydrochloric acid, the gelling agent, a corrosion inhibitor WLD-31A, a ferrous stability B-180 and a petroleum deemulsifier AP-221 are added, so that the low-friction-resistance high-temperature-resistant gelled acid is prepared. The preparation method disclosed by the invention is simple, the production cost is reduced greatly, the prepared gelled acid is 45-56% in retardance ratio, 57% in resistance reduction ratio, and excellent in high-temperature resistance; when the gelled acid is cut constantly for 2 h under the temperature of 120 DEG C, the viscosity is maintained about 50 mpa.s, and acid etching crack length can be increased effectively.

Description

technical field [0001] The invention relates to the field of oilfield chemistry, in particular to a low-friction impedance high-temperature thickened acid and a preparation method thereof. Background technique [0002] Thickened acid (also known as gelled acid) and its construction technology are a new oil and gas well stimulation technology developed in the 1970s abroad. The viscosity of the liquid system. Thickening agent is the key to formulating thickening acid. Its research has gone through the research process from general natural polymers, modified natural polymers, and synthetic polymer compounds. Due to the limitations of temperature resistance and shear resistance, mature There are fewer types of acid thickeners. In 1980, Halliburton Company of the United States successfully developed a new acid thickener by copolymerizing acrylamide and cationic monomers. The invention of this thickener laid the foundation for the promotion of thickened acid technology. Subsequ...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/58C08F226/02C09K8/74
Inventor 刘通义戴秀兰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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