Preparation technology of water phase transmission drag reducer for slickwater fracturing

A preparation process and hydraulic fracturing technology, applied in the preparation of organic compounds, the preparation of carboxylic acid amides, the composition of drilling holes, etc., can solve the problem of low drag reduction rate, low resistance to calcium and magnesium divalent metal ions, The problem of slow onset of hydration, etc., achieves the effect of drag reduction rate and long-term effect, good compatibility and low production investment

Active Publication Date: 2014-01-29
上海三浦生物科技有限公司
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Problems solved by technology

Through our research, the monomer synthesis process has a significant effect on the drag reduction performance. The patent WO 2011 / 004141 A1 method cannot obtain a drag reducer with excellent performance, especially the resistance to calcium and magnesium divalent metal ions, and its drag reduction rate is also 50%. ~60%, even when the slick water contains more than 1% calcium chloride, the drag reduction rate drops rapidly to less than 45%, and the drag reduction rate gradually loses with time, which seriously affects the drag reduction effect of slick water; Naco Company (Comparing Friction Reducers' Performance in Produced Water from Tight Gas Shales. JPT Nov. 2009 ) Through the drag reduction performance comparison of various drag reducers on the market, which actually includes Halliburton products, the drag reduction rate of the best drag reducer is 68%, and its ring test It shows that the drag reduction effect time is seriously delayed, and the drag reduction effect can only be achieved in 2 minutes, which is basically consistent with the Halliburton patent report
So at present, the drag reducing agent we rely on from foreign companies has a low drag reduction rate, no more than 70%, slow hydration onset, and weak resistance to calcium and magnesium divalent metal ions. After a period of use, the drag reduction rate drops rapidly, or even fails. , indicating that high-salinity water quality cannot be used to prepare slick water, which is a huge challenge for oilfield water (Shawn M. Rimassa, et al, Optimizing Fracturing Fluid from Flowback Water. SPE 125336, the 2009 SPE Tight Gas Completions Conference, San Antonio, Taxes, USA, 15-17 June 2009)

Method used

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  • Preparation technology of water phase transmission drag reducer for slickwater fracturing
  • Preparation technology of water phase transmission drag reducer for slickwater fracturing
  • Preparation technology of water phase transmission drag reducer for slickwater fracturing

Examples

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Effect test

Embodiment 1

[0032] 1. The preparation steps of the drag reducer are as follows:

[0033] 1. Mix refined acrylonitrile and pure water at a volume ratio of 1:7, add Raney copper, heat to 110~120°C, hydration reaction to generate acrylamide aqueous solution with a mass concentration of 16%, and obtain 40% by flash evaporation The aqueous solution of acrylamide monomer, with copper ion content below 5 ppm, is used as one of the monomer raw materials for synthesizing drag reducer;

[0034] 2. Dilute the above aqueous solution of acrylamide monomer with water to 22.0%, add tert-butylacrylamide accounting for 1.5% by weight of the aqueous solution of acrylamide monomer, freeze the mixture to a temperature of 7°C, and stir and mix evenly in the batching tank;

[0035] 3. Sodium carbonate, which accounts for 4.7% of the weight of the mixed solution, is first dissolved in water to form a solution, and then added to the above mixed solution under continuous stirring. After stirring evenly, EDTA diso...

Embodiment 2

[0043] 1. The preparation steps of the drag reducer are as follows:

[0044] 1. Mix refined acrylonitrile and water at a volume ratio of 1:7, add Raney copper, heat to 110~130°C, hydration reaction to generate an acrylamide aqueous solution with a mass concentration of 15.5%~20.5%, which is obtained by flash evaporation 38% aqueous solution of acrylamide monomer, with copper ion content below 5 ppm, used as one of the monomer raw materials for synthesizing drag reducer;

[0045] 2. Dilute the above pure acrylamide monomer aqueous solution to 21.5% with water, add tert-butylacrylamide accounting for 1.0% of the weight of the acrylamide monomer aqueous solution, freeze the mixed solution to a temperature below 8°C, and stir and mix evenly in the batching tank;

[0046] 3. Sodium carbonate, which accounts for 4.7% of the weight of the mixed solution, is first dissolved in water to form a solution, and Span-40 is added to the solution, the amount of which is 250ppm. The total weig...

Embodiment 3

[0053] 1. The preparation steps of the drag reducer are as follows:

[0054] 1. Mix refined acrylonitrile and water at a volume ratio of 1:7, add Raney copper, heat to 95~140°C, and hydrate to form an aqueous solution of acrylamide with a mass concentration of 15.5%~20.5%, which is obtained by flash evaporation 42% acrylamide monomer aqueous solution, with copper ion content below 5 ppm, used as one of the monomer raw materials for synthesizing drag reducer;

[0055] 2. Dilute the above pure acrylamide monomer aqueous solution to 22.0% with water, add tert-butylacrylamide accounting for 1.2% of the weight of the acrylamide monomer aqueous solution, freeze the mixed solution to a temperature below 8°C, stir and mix evenly in the batching tank ;

[0056] 3. Sodium carbonate accounting for 3.6% of the weight of the mixed solution is dissolved in water to form a solution, and then added to the above mixed solution under continuous stirring. After stirring evenly, add 80 ppm of di...

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Abstract

The invention discloses a preparation technology of a water phase transmission drag reducer for slickwater fracturing, and belongs to the field of oil field chemical water phase drag reduction technology. The preparation technology comprises following steps: an acrylamide monomer aqueous solution with a mass concentration of 18.5 to 25.5% is prepared; tert-butylacrylamide is added, wherein the content of tert-Butylacrylamide is 0.2 to 2.0wt% of that of the acrylamide monomer aqueous solution; sodium carbonate is added, wherein the content of sodium carbonate is 2.5 to 8.0wt% of that of the acrylamide monomer aqueous solution; a chelating agent, a chain transfer agent, a chain extender and a water soluble azo-compound are added; the mixture is subjected to polymerization and hydrolysis so as to obtain gel blocks; the gel blocks are processed so as to obtain polyacrylamide powder; and the polyacrylamide powder is mixed with sodium chloride particles so as to obtain the water phase transmission drag reducer. An optimized application concentration of the water phase transmission drag reducer ranges from 250 to 500ppm; compatibility with common bactericides, antiswelling agents and discharge aiding agents is excellent; solution formed by the water phase transmission drag reducer is stable; drag reduction efficiency is high and lasts long; influence of water mineralization degree on preparation of slickwater is less; and the water phase transmission drag reducer is suitable for water with more than 10% calcium chloride.

Description

technical field [0001] The invention discloses a preparation process of a water-phase transmission drag reducing agent for slick water fracturing, which belongs to the technical field of oil field chemical water-phase drag reduction. Background technique [0002] Slickwater (slick water) fracturing fluid is the main fracturing fluid for unconventional shale oil and gas fracturing construction. It is composed of drag reducer and other additives. The key component is drag reducer. Most of them rely on imports, which are expensive and seriously It hinders the exploitation of shale gas resources in my country's oilfields. Therefore, it has important practical significance and economic benefits to develop a slickwater fracturing drag reducing agent suitable for oilfield shale oil and gas reservoirs. [0003] Polymer polyacrylamide can be used as water-phase friction reducer. The main component of Halliburton slippery water is anionic polyacrylamide (WO 2011 / 004141 A1, Improving F...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/54C08F4/40C08F8/12C08J3/12C07C233/09C07C231/06C07C231/24C09K8/68
Inventor 胡志孟徐建牛保伟
Owner 上海三浦生物科技有限公司
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