Cross-linked polymer gel and preparation method thereof

Abstract

The invention provides cross-linked polymer gel and a preparation method thereof. The cross-linked polymer gel is coupled by a cross-linked polymer and a cross-linking agent; and by the joint action of the cross-linked polymer and the cross-linking agent, the joint of acid liquor is realized under the normal temperature. The cross-linked polymer gel has better temperature stability and cut-resistant property, thus realizing the lower filtering loss of the acid liquor and the reaction speed of acid rocks under the reservoir stratum condition and improving the acid-fracturing effect and the economic effect. The invention conducts a test according to the industrial standard SY / T5764-1995, SY / T6214-1996 by the fracture and acidification research center of oil extraction technique research institute of China Petroleum Shengli Oil Field Company Limited, and the test result displays that all indexes achieve the industrial standard.

Description

Technical field:

[0001] The invention belongs to the field of high-molecular polymers, and particularly relates to a ground normal-temperature cross-linked polymer jelly body used for carrying sand in acid fracturing and a preparation method thereof. The cross-linked polymer jelly body is composed of a cross-linked polymer and a cross-linking agent coupled. Background technique:

[0002] The eastern and western oil regions of my country have made great progress in the exploration and development of carbonate reservoirs in recent years, especially in the Tahe and Tazhong ultra-deep carbonate reservoirs in the Tarim Basin through acid fracturing. Good oil and gas exploration effect. Due to the well-developed pores and fractures of carbonate reservoirs and high formation temperature, to ensure the effect of acid fracturing, it is necessary to increase the penetration depth of acid fracturing fractures in the reservoir and improve the conductivity of acid-etched fractures. In th...

Examples

Embodiment 1

[0047] A cross-linked polymer jelly body, the system is composed of a cross-linked polymer and a cross-linking agent;

[0048] The steps of the preparation method of described cross-linked polymer jelly body are:

[0049] I. Synthesis of cross-linked polymers:

[0050] A. the synthesis of acrylate-2-hydroxyethyl ester: add acrylic acid, catalyzer, polymerization inhibitor in reactor, the pressure of reactor is raised to 0.4MPa, slowly feed oxyethane in this reactor; The temperature in the reactor is controlled at 60°C to 80°C, and the contents in the reactor are stirred and reacted for 8 to 12 hours; then the reactor is cooled to normal temperature, and the product in the reactor is subjected to vacuum distillation , at a pressure of 1.6Kpa, the fraction with a boiling point between 90 and 92°C was collected to obtain a colorless transparent liquid, which was the target product;

[0051] The weight ratio of described acrylic acid and ethylene oxide is 1.46-1.80: 1.0-1.25;

...

Embodiment 2

[0085] This embodiment is a preferred scheme based on embodiment 1, and the quality of raw materials used, the type and source of the instrument used are the same as in embodiment 1;

[0086] The steps of the preparation method of the cross-linked polymer jelly body refer to Example 1, the difference is:

[0087] I. Synthesis of cross-linked polymers:

[0088] In step A:

[0089] The weight ratio of described acrylic acid and oxirane is 1.46: 1.0;

[0090] The catalyst is an iron catalyst catalyst, and its weight accounts for 1% of the weight of acrylic acid;

[0091] Described polymerization inhibitor is p-hydroxyanisole, and weight accounts for 400ppm of the total weight of described acrylic acid, described catalyst, described polymerization inhibitor;

[0092] In step B:

[0093] The weight ratio of the 2-acrylamido 2-methylpropanesulfonic acid (AMPS), acrylic acid (AA), and deionized water is 18:1:55;

[0094] Described carbonate is the one in salt of wormwood, potass...

Embodiment 3

[0114] This embodiment is a preferred scheme based on embodiment 1, and the quality of raw materials used, the type and source of the instrument used are the same as in embodiment 1;

[0115] The steps of the preparation method of the cross-linked polymer jelly body refer to Example 1, the difference is:

[0116] I. Synthesis of cross-linked polymers:

[0117] In step A:

[0118] The weight ratio of described acrylic acid and oxirane is 1.80: 1.25;

[0119] The catalyst is an iron catalyst catalyst, and its weight accounts for 3% of the weight of acrylic acid;

[0120] Described polymerization inhibitor is p-hydroxyanisole, and weight accounts for 1000ppm of the total weight of described acrylic acid, described catalyst, described polymerization inhibitor;

[0121] In step B:

[0122] The weight ratio of the 2-acrylamido 2-methylpropanesulfonic acid (AMPS), acrylic acid (AA), and deionized water is 25:1.5:40;

[0123] Described carbonate is a kind of in sodium carbonate, ...

Technical field:

[0001] The invention belongs to the field of high-molecular polymers, and particularly relates to a ground normal-temperature cross-linked polymer jelly body used for carrying sand in acid fracturing and a preparation method thereof. The cross-linked polymer jelly body is composed of a cross-linked polymer and a cross-linking agent coupled. Background technique:

[0002] The eastern and western oil regions of my country have made great progress in the exploration and development of carbonate reservoirs in recent years, especially in the Tahe and Tazhong ultra-deep carbonate reservoirs in the Tarim Basin through acid fracturing. Good oil and gas exploration effect. Due to the well-developed pores and fractures of carbonate reservoirs and high formation temperature, to ensure the effect of acid fracturing, it is necessary to increase the penetration depth of acid fracturing fractures in the reservoir and improve the conductivity of acid-etched fractures. In th...

Examples

Embodiment 1

[0047] A cross-linked polymer jelly body, the system is composed of a cross-linked polymer and a cross-linking agent;

[0048] The steps of the preparation method of described cross-linked polymer jelly body are:

[0049] I. Synthesis of cross-linked polymers:

[0050] A. the synthesis of acrylate-2-hydroxyethyl ester: add acrylic acid, catalyzer, polymerization inhibitor in reactor, the pressure of reactor is raised to 0.4MPa, slowly feed oxyethane in this reactor; The temperature in the reactor is controlled at 60°C to 80°C, and the contents in the reactor are stirred and reacted for 8 to 12 hours; then the reactor is cooled to normal temperature, and the product in the reactor is subjected to vacuum distillation , at a pressure of 1.6Kpa, the fraction with a boiling point between 90 and 92°C was collected to obtain a colorless transparent liquid, which was the target product;

[0051] The weight ratio of described acrylic acid and ethylene oxide is 1.46-1.80: 1.0-1.25;

...

Embodiment 2

[0085] This embodiment is a preferred scheme based on embodiment 1, and the quality of raw materials used, the type and source of the instrument used are the same as in embodiment 1;

[0086] The steps of the preparation method of the cross-linked polymer jelly body refer to Example 1, the difference is:

[0087] I. Synthesis of cross-linked polymers:

[0088] In step A:

[0089] The weight ratio of described acrylic acid and oxirane is 1.46: 1.0;

[0090] The catalyst is an iron catalyst catalyst, and its weight accounts for 1% of the weight of acrylic acid;

[0091] Described polymerization inhibitor is p-hydroxyanisole, and weight accounts for 400ppm of the total weight of described acrylic acid, described catalyst, described polymerization inhibitor;

[0092] In step B:

[0093] The weight ratio of the 2-acrylamido 2-methylpropanesulfonic acid (AMPS), acrylic acid (AA), and deionized water is 18:1:55;

[0094] Described carbonate is the one in salt of wormwood, potass...

Embodiment 3

[0114] This embodiment is a preferred scheme based on embodiment 1, and the quality of raw materials used, the type and source of the instrument used are the same as in embodiment 1;

[0115] The steps of the preparation method of the cross-linked polymer jelly body refer to Example 1, the difference is:

[0116] I. Synthesis of cross-linked polymers:

[0117] In step A:

[0118] The weight ratio of described acrylic acid and oxirane is 1.80: 1.25;

[0119] The catalyst is an iron catalyst catalyst, and its weight accounts for 3% of the weight of acrylic acid;

[0120] Described polymerization inhibitor is p-hydroxyanisole, and weight accounts for 1000ppm of the total weight of described acrylic acid, described catalyst, described polymerization inhibitor;

[0121] In step B:

[0122] The weight ratio of the 2-acrylamido 2-methylpropanesulfonic acid (AMPS), acrylic acid (AA), and deionized water is 25:1.5:40;

[0123] Described carbonate is a kind of in sodium carbonate, ...

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