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Method for preparing acid fracturing, temperature-controlled and variable-viscosity polymer and polymer cross-linked body

A polymer and acid fracturing technology, applied in the field of acid fracturing of oil and gas wells, can solve the problems of low viscosity, acid fluid loss and acid-rock reaction speed gap, etc., to ensure effective reaction, reduce damage, and improve acid fracturing effect. and economic effects

Inactive Publication Date: 2012-04-25
BEIJING FRAC TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Gelling acid systems commonly used in the prior art, such as gelling acid, emulsifying acid, and surfactant retarded acid, have relatively low viscosity (generally not greater than 100mPa.s) in reducing acid fluid loss and acid-rock reaction speed. big gap

Method used

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  • Method for preparing acid fracturing, temperature-controlled and variable-viscosity polymer and polymer cross-linked body

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Embodiment 1: a kind of preparation method of the polymer that is used for acid fracturing temperature control becomes viscous, comprises the following steps:

[0049] 1) Put AMPS and AA into the deionized water in the reactor in turn, stir until completely dissolved, slowly add carbonate under stirring, the amount of carbonate added is 13% to 16% of the total weight of AMPS and AA %, stirred until completely dissolved; the weight ratio of AMPS, AA and deionized water is:

[0050] AMPS 43~55

[0051]AA 1~5

[0052] Deionized water 254~280;

[0053] The carbonate in this embodiment can be one or both of potassium carbonate, potassium bicarbonate, sodium carbonate, sodium bicarbonate, ammonium carbonate, ammonium bicarbonate, etc. used in combination, such as potassium carbonate and ammonium carbonate (potassium carbonate and ammonium carbonate weight ratio is 2:1);

[0054] 2) Add acrylamide accounting for 26% to 30% of the total amount to the solution obtained in st...

Embodiment 2

[0066] Embodiment 2: A kind of preparation method of the polymer cross-linked body that is used for acid fracturing temperature control becomes viscous, comprises the following steps:

[0067] 1) Put AMPS and AA into the deionized water in the reaction kettle in turn, stir until completely dissolved, slowly add potassium carbonate accounting for 13% of the total material (AMPS and AA total weight) under stirring, and stir until completely dissolved; AMPS , The weight ratio of AA to deionized water is:

[0068] AMPS 43

[0069] AA 1

[0070] Deionized water 280;

[0071] 2) Add acrylamide (AM) accounting for 26% (by weight) of the total amount to the solution obtained in step 1), and stir evenly until completely dissolved;

[0072] 3) Add 0.3% (by weight) of methacryloyloxyethyltrimethylammonium chloride (DMC) to the solution obtained in step 2), stir well, and control the temperature of the obtained solution at 6℃~8℃, adjust the pH value to 7.4~7.8; if the pH value is high...

Embodiment 3

[0093] Embodiment 3: A kind of preparation method of the polymer cross-linked body that is used for acid fracturing temperature control becomes viscous, comprises the following steps:

[0094] 1) Put AMPS and AA into the deionized water of the reactor in turn, stir until completely dissolved, slowly add potassium bicarbonate accounting for 13% of the total material (AMPS and AA total weight) under stirring, and stir until completely dissolved; The weight ratio of AMPS, AA and deionized water is:

[0095] AMPS 43

[0096] AA 1

[0097] Deionized water 280;

[0098] 2) Add acrylamide (AM) accounting for 26% (by weight) of the total amount to the solution obtained in step 1), and stir evenly until completely dissolved;

[0099] 3) Add 0.3% (by weight) of methacryloyloxyethyltrimethylammonium chloride (DMC) to the solution obtained in step 2), stir well, and control the temperature of the obtained solution at 6℃~8℃, adjust the pH value to 7.4~7.8; if the pH value is higher tha...

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Abstract

The invention relates to a method for preparing an acid fracturing, temperature-controlled and variable-viscosity polymer and a polymer cross-linked body. The polymer is coupled with a compound cross-linking agent to form the polymer cross-linked body; the polymer cross-linked body can be used for performing formation acid fracturing at the temperature of less than 120 DEG C; the viscosity of thepolymer is about 20mPa.s at the temperature of 25 DEG C; the polymer is cross-linked at the temperature of between 60 and 90 DEG C for 5 to 10 minutes and can be hung, so that the viscosity of the polymer is up to 100mPa.s; and the viscosity of the polymer can be kept between 10 and 20mPa.s at the temperature of 120 DEG C. Since the polymer has a variable-viscosity characteristic, formation filtration is effectively reduced, active acid liquor can penetrate into the deep part of the formation, effective reaction of the acid liquor and reservoir rock is ensured and acid fracturing effect and economic benefit are improved.

Description

technical field [0001] The invention relates to the field of acid fracturing of oil and gas wells in oil and gas field development engineering, in particular to a polymer and a polymer cross-linked body used for acid fracturing to become viscous under temperature control. Background technique [0002] Carbonate oil and gas reservoirs occupy an important position in the distribution of oil and gas reservoirs in the world. According to preliminary statistics, carbonate rock reservoirs have been discovered and developed in 57 sedimentary basins in nearly 40 countries and regions in the world. The reserves account for 48% and 28% of the world's total oil and gas reserves respectively, and the oil and gas production account for about 60% and 30% of the world's total oil and gas respectively. [0003] Since the 1970s, my country has successively discovered and developed more than 30 carbonate buried hill oil and gas reservoirs in Shengli, North China, Liaohe, Tarim and other basin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/58C08F220/56C08J3/24C09K8/62
Inventor 韩林陆现桥武志勇王善江申斌徐建富
Owner BEIJING FRAC TECH DEV
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