Resistance reducing agent, resistance reducing solution containing resistance reducing agent, and application of resistance reducing solution

A drag-reducing agent and water-resistance reducing technology, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of reservoir damage, drag-reducing agent cannot be degraded, etc. The effect of improving sand-carrying performance

Active Publication Date: 2016-03-16
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above prior art solves the problem of water-reducing formula, instant dissolving and recycling of water-reducing water, but the disadvantage is that the high-molecular-weight drag-reducing agent in residual water after fracturing cannot be degraded, which will cause certain damage to the reservoir. harm

Method used

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  • Resistance reducing agent, resistance reducing solution containing resistance reducing agent, and application of resistance reducing solution
  • Resistance reducing agent, resistance reducing solution containing resistance reducing agent, and application of resistance reducing solution
  • Resistance reducing agent, resistance reducing solution containing resistance reducing agent, and application of resistance reducing solution

Examples

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Effect test

Embodiment 1

[0062] Based on the total mass of raw materials participating in inverse emulsion polymerization, the drag reducer emulsion was synthesized according to the following specific steps:

[0063] 1) Preparation of the water phase: Dissolve 40.17g of glyceryl dimethacrylate, 47.73g of allyltrimethylammonium chloride, and 25g of acrylamide in distilled water, add 0.15g of disodium EDTA, and add 0.045g of disodium EDTA before emulsification to trigger Agent V50, dissolved evenly.

[0064] 2) Preparation of the oil phase: Weigh 64g of white oil with a mass ratio of 20%, and emulsifiers Span-80 (4%, 12.8g), span85 (1%, 3.2g).

[0065] 3) Emulsification: add the water phase dropwise under the condition of Jingjing nitrogen (that is, nitrogen with a purity of 99.99%), the stirring speed is 2000r / min during the dropping, and the dropping time is 65-75min. After the dropwise addition, stir for 30 minutes.

[0066] 4) Reaction: control the heating rate, raise the temperature to 63-65° C.,...

Embodiment 2

[0071] Based on the total mass of raw materials participating in inverse emulsion polymerization, the drag reducer emulsion was synthesized according to the following specific steps:

[0072] 1) Preparation of the water phase: Dissolve 40.17g of glyceryl dimethacrylate, 23.87g of allyltrimethylammonium chloride, and 37.53g of acrylamide in distilled water, add 0.15g of disodium EDTA, and add 0.05g of it before emulsification Initiator V50, dissolves evenly.

[0073] 2) Preparation of the oil phase: Weigh 64g of white oil with a mass ratio of 20%, and emulsifiers Span-80 (4%, 12.8g), span85 (1%, 3.2g).

[0074] 3) Emulsification: add the water phase dropwise under the condition of nitrogen, the stirring speed is 2000r / min, and the dropping time is 65-75min. After the dropwise addition, stir for 30 minutes.

[0075] 4) Reaction: Control the heating rate, raise the temperature to 63-65°C, and stop the reaction after 4.5 hours.

[0076] Take 492.35ml of distilled water and plac...

Embodiment 3

[0080] Based on the total mass of raw materials participating in inverse emulsion polymerization, the drag reducer emulsion was synthesized according to the following specific steps:

[0081] 1) Preparation of the water phase: Dissolve 40.17g of glyceryl dimethacrylate, 73.11g of methacryloyloxyethyltrimethylammonium chloride, and 37.53g of acrylamide in distilled water, and add 0.15g of disodium EDTA to emulsify Before adding 0.53g initiator V50, dissolve evenly.

[0082] 2) Preparation of the oil phase: Weigh 64g of white oil with a mass ratio of 20%, and emulsifiers Span-80 (4%, 12.8g), span85 (1%, 3.2g).

[0083] 3) Emulsification: Circulate the oil phase, add the water phase dropwise under the condition of purifying nitrogen, the stirring speed is 2000r / min during the dropwise addition, the dropwise addition time is 65-75min, and stir for 30min after the dropwise addition is completed.

[0084] 4) Reaction: Control the heating rate, raise the temperature to 63-65°C, and ...

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Abstract

The invention provides a resistance reducing agent, a resistance reducing solution containing the resistance reducing agent, and an application of the resistance reducing solution, and belongs to the field of a gas well fracturing agent. The resistance reducing agent is prepared from acrylamide, an ester monomer A, and a cationic monomer B according to a molar ratio of (1-4):0.5:(0.5-1) through random copolymerization of inverse emulsion polymerization, wherein the ester monomer A is a specific esterification product prepared from methacrylic acid and / or acrylic acid and glycerol; the cationic monomer B is allyltrimethylammonium chloride or methacrylatoethyl trimethyl ammonium chloride; and the obtained copolymer has a viscosity average molecular weight being 5*10<5>-8*10<5>. The resistance reducing solution containing the resistance reducing agent is high in resistance reducing efficiency. The resistance reducing agent is degradable, thereby causing no damage to a reservoir stratum.

Description

technical field [0001] The invention relates to a drag reducing agent used in gas well fracturing stimulation, drag reducing water containing the drag reducing agent and application thereof. Background technique [0002] Unconventional reservoirs such as shale gas and tight gas (unconventional reservoirs and unconventional gas wells are a term that has emerged in recent years, mainly referring to reservoirs and gas wells with low permeability) have become hot spots in oil and gas exploration and development. Practice has shown that In the development of unconventional gas wells such as tight sandstone and shale gas reservoirs, large-scale, high-displacement volume fracturing is required to achieve profitable development. In the United States, volume fracturing is the main production stimulation method for shale gas reservoirs, and the volume of fluid used for volume fracturing in typical horizontal wells is 20,000-30,000 m 3 . In the Changning-Weiyuan National Shale Gas De...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/06C08F222/20C08F226/02C08F220/34C08F2/30C09K8/68
Inventor 陈鹏飞刘友权王小红王川张永国石晓松黄瑛
Owner PETROCHINA CO LTD
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