Drag reducer for slickwater fracturing on unconventional oil and gas reservoirs and preparation method of drag reducer

A technology for oil and gas reservoirs and water fracturing, which is applied in the directions of chemical instruments and methods, drilling compositions, etc., and can solve the problems that are not conducive to the protection of reservoirs. It can reduce the interfacial tension of the oil-water surface, enhance the drag reduction effect, and reduce the surface interfacial tension.

Active Publication Date: 2015-03-25
DAQING BEIHUA CHEM PLANT
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

Under the admiration of the fracturing method of "Thousands of sand, Wanfang liquid, low sand ratio, and large displacement", domestic research on slick water drag reducers has just started. Invention patent 201110401452.7 discloses a shale gas reservoir Instant recyclable slick water, the drag reducer used is 5 million to 10 million polyacrylamide or polyacrylamide derivatives, and the added amou

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  • Drag reducer for slickwater fracturing on unconventional oil and gas reservoirs and preparation method of drag reducer
  • Drag reducer for slickwater fracturing on unconventional oil and gas reservoirs and preparation method of drag reducer

Examples

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Example Embodiment

[0026] In order to prepare the slick water fracturing drag reducer described above, a preparation method of a slick water fracturing drag reducer for fracturing unconventional oil and gas reservoirs is provided, which includes the following steps:

[0027] (1) Add 15# white oil by weight calculated according to the formula into the reactor, and the purity of 15# white oil is greater than 95%;

[0028] (2) At room temperature, add potassium oleate while stirring in the reactor and stir evenly. After dissolving, add hydroxypropyl oleic acid amide betaine, water-in-oil polyacrylamide (molecular weight 5 million), and sorbitol polyoxygen Vinyl ether, nonylphenol polyoxyethylene ether, and stir evenly.

[0029] (3) Add 2% drainage aid to the reaction kettle while stirring, and then stir for 5-10 minutes until fully mixed to obtain a drag reducer used for slick water fracturing of unconventional oil and gas reservoirs.

Example Embodiment

[0030] Example 1

[0031] A slippery water fracturing drag reducer used for fracturing of unconventional oil and gas reservoirs, in terms of mass fraction, including 45% polyacrylamide, 10% potassium oleate, and 5% hydroxypropyl oleic acid amide betaine, 3% sorbitol polyoxyethylene ether, 3% nonylphenol polyoxyethylene ether, 2% drainage aid, the balance is 15# white oil.

[0032] The polyacrylamide adopts an anionic water-in-oil polyacrylamide emulsion with a molecular weight of 5 million; the drainage aid is an anionic fluorocarbon surfactant.

[0033] The preparation method of the slick water fracturing drag reducer used in the fracturing of unconventional oil and gas reservoirs includes the following steps:

[0034] (1) Add 15# white oil with a purity greater than 95% into the reactor;

[0035] (2) Add potassium oleate to the reactor, after stirring to dissolve, add a water-in-oil polyacrylamide emulsion with a molecular weight of 5 million, and then add nonylphenol polyoxyethylene...

Example Embodiment

[0042] Example 2

[0043] A slippery water fracturing drag reducer used for fracturing of unconventional oil and gas reservoirs, in terms of mass fraction, including 50% polyacrylamide, 12% potassium oleate, 7% hydroxypropyl oleic acid amide betaine, 5% sorbitol polyoxyethylene ether, 5% nonylphenol polyoxyethylene ether, 2% drainage aid, the balance is 15# white oil.

[0044] The polyacrylamide adopts an anionic water-in-oil polyacrylamide emulsion with a molecular weight of 5 million; the drainage aid is an alcohol ether nonionic surfactant.

[0045] The preparation method of the slick water fracturing drag reducer used in the fracturing of unconventional oil and gas reservoirs includes the following steps:

[0046] (1) Add 15# white oil with a purity greater than 95% into the reactor;

[0047] (2) Add potassium oleate to the reactor, after stirring to dissolve, add a water-in-oil polyacrylamide emulsion with a molecular weight of 5 million, and then add nonylphenol polyoxyethylene e...

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Abstract

The invention discloses a drag reducer for slickwater fracturing on unconventional oil and gas reservoirs and a preparation method of the drag reducer, and belongs to the technical field of chemicals for the petroleum industry. The drag reducer for slickwater fracturing on the unconventional oil and gas reservoirs comprises components in percentage by mass as follows: 45%-65% of polyacrylamide, 10%-12% of potassium oleate, 5%-7% of hydroxypropyl oleamide betaine, 3%-5% of sorbitol polyoxylethylene ether, 3%-5% of nonyl phenol polyoxyethylene ether, 2% of a discharge aiding agent and the balance of 15# white oil. The slickwater drag reducer has higher drag reduction property and system stability, and the fluid flow velocity change gradient is reduced through synergism of a polymer and a viscoelastic surfactant to realize the drag reduction action; and besides, the polymer molecular weight is smaller, a molecular film is prevented from forming and blocking rock pores, the surface/interfacial tension of oil and water can be reduced with adding of the surfactant, fracturing backflow can be facilitated, the nitrogen lift effect after fracturing can be increased, and permanent harm of slickwater to the reservoirs is effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of chemicals used in the petroleum industry, and relates to a drag reducer for unconventional oil and gas fracturing and a preparation method thereof, in particular to a drag reducer for slick water fracturing of unconventional oil and gas reservoirs and a preparation method thereof. Background technique [0002] With the upsurge in the exploitation of unconventional oil and gas resources, the slickwater fracturing technology suitable for the exploitation of unconventional reservoirs such as low permeability and low porosity has been increasingly popularized. Slick water is to add a certain amount of chemical additives such as drag reducer, clay stabilizer, bactericide and metal salt to the aqueous solution to form a pressure reducing agent with low viscosity, shear resistance, small damage and good drag reduction. cracking liquid system. Slippery water fracturing was first used for fracturing and stimulati...

Claims

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Application Information

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IPC IPC(8): C09K8/68
CPCC09K8/602C09K8/604C09K8/68C09K8/882C09K8/885C09K2208/30
Inventor 沈一丁张锋三李小瑞王磊马国艳苏莹
Owner DAQING BEIHUA CHEM PLANT
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