Hypersalinity water-based delayed crosslinking gel fracturing fluid and preparation method thereof

A gel fracturing fluid, high salinity technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of low friction, high temperature resistance, etc., achieve strong water solubility, wide application range, The effect of solving the scarcity of fresh water resources

Active Publication Date: 2022-05-31
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The working fluid for reservoir stimulation and transformation needs to have the performance of low friction and high temperature resistance, and these two points are inherently contradictory

Method used

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  • Hypersalinity water-based delayed crosslinking gel fracturing fluid and preparation method thereof

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preparation example Construction

[0029] A preparation method of high-salinity water-based delayed crosslinking jelly fracturing fluid, comprising the following steps:

[0030] Step 1: Add the thickening agent under the stirring condition of high salinity brine to completely dissolve it;

[0031] The preparation method of thickener is as follows:

[0032] Acrylamide, acrylic acid, methacryloyloxyethyltrimethylammonium chloride, 2-acrylamide-2-methylpropanesulfonic acid, N-hexadecylmethacrylamide in a mass ratio of 65:20 :10:4.8:0.2 is added in the solvent to obtain the polymerization reaction solution that the monomer mass concentration is 30 wt.%.

[0033] Sodium dodecylsulfonate is added in the polymerization reaction solution, and the pH value is adjusted to neutrality through sodium hydroxide solution; wherein the mass ratio of sodium dodecylsulfonate and monomer is 10:1;

[0034] Then add the initiator and react for 3-4 hours at 40-50°C to obtain the required thickener. The initiator is a mixture of am...

Embodiment 1

[0041] Follow the steps below to prepare high-salinity water-based delayed cross-linking gel fracturing fluid, including the following steps:

[0042] Step 1: Prepare 1 L of brine system with a salinity of 180,000 mg / L, and then use a high-speed stirrer to stir at a speed of 1000 r / min. Slowly add 3 g thickener SG. Stir for 5 minutes to dissolve completely.

[0043] The preparation method of thickener is as follows:

[0044] Acrylamide, acrylic acid, methacryloxyethyltrimethylammonium chloride, 2-acrylamide-2-methylpropanesulfonic acid and N-hexadecylmethacrylamide are in a mass ratio of 65:20 :10:4.8:0.2 was added to the solvent to prepare a polymerization reaction solution with a monomer mass concentration of 30 wt.%.

[0045] Add 0.1 g sodium dodecylsulfonate to the polymerization reaction solution, add sodium hydroxide solution to adjust the pH value to neutrality, add ammonium persulfate and sodium sulfite to form a redox system initiator with a mass ratio of 2:1, add ...

Embodiment 2

[0050]Follow the steps below to prepare high-salinity water-based delayed cross-linking gel fracturing fluid, including the following steps:

[0051] Follow the steps below to prepare high-salinity water-based delayed cross-linking gel fracturing fluid, including the following steps:

[0052] Step 1: Prepare 1 L of brine system with a salinity of 200,000 mg / L, and then use a high-speed stirrer to stir at a speed of 1000 r / min. Slowly add 3 g thickener SG. Stir for 5 minutes to dissolve completely.

[0053] Thickener preparation method is as follows:

[0054] Acrylamide, acrylic acid, methacryloxyethyltrimethylammonium chloride, 2-acrylamide-2-methylpropanesulfonic acid and N-hexadecylmethacrylamide are in a mass ratio of 65:20 :10:4.8:0.2 was added to the solvent to prepare a polymerization reaction solution with a monomer mass concentration of 30 wt.%.

[0055] Add 0.1 g sodium dodecylsulfonate to the polymerization reaction solution, add sodium hydroxide solution to adju...

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Abstract

The invention discloses a hypersalinity water-based delayed cross-linking gel fracturing fluid and a preparation method thereof. The hypersalinity water-based delayed cross-linking gel fracturing fluid comprises the following components in percentage by weight: 0.3 wt.%-0.5 wt.% of a thickening agent, 0.3 wt.%-0.5 wt.% of a cross-linking agent, 0.05 wt.% of a temperature stabilizer, 0.02 wt.%-0.05 wt.% of a cleanup additive and the balance of hypersalinity saline water, the fracturing fluid obtained by the invention can realize delayed cross-linking gel formation aiming at hydraulic fracturing of deep wells and ultra-deep wells. The fracturing fluid can resist the temperature of 180 DEG C or above, the application range is wide, a fracturing fluid system can be directly prepared from high-salinity saline water, and the problem that fresh water resources are deficient in a construction site is effectively solved; the raw materials are wide, the preparation method is simple, and the cost is low.

Description

technical field [0001] The invention relates to the technical field of fracturing stimulation in the process of oil and gas field exploitation, in particular to a high-salinity water-based delayed crosslinking jelly fracturing fluid and a preparation method thereof. Background technique [0002] Oil and gas data is an important strategic material for national development and an important part of economic construction, and fracturing is the main production stimulation measure for oil and gas reservoirs. With the deepening of oil and gas exploitation, higher requirements are put forward for fracturing stimulation methods and fracturing fluids. For example, the northwestern region of my country is rich in oil and gas resources, and at the same time, oil and gas resources are generally buried deeper than in the east. For example, in the newly discovered Shunbei Oilfield, the well depth is generally more than 8,000 meters, and the formation temperature can reach 180°C. Since the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68C09K8/88
CPCC09K8/68C09K8/685C09K8/882C09K8/887
Inventor 刘平礼李辉王承杰杜娟陈祥李骏罗志锋刘金明王冠
Owner SOUTHWEST PETROLEUM UNIV
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