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A kind of multifunctional cleaning drag reducing agent for shale gas fracturing and preparation method thereof

A drag reducer and multi-functional technology, applied in the field of multi-functional clean drag reducer for shale gas fracturing and its preparation, can solve the problems of high cost, complicated on-site liquid preparation operation, large workload, etc. resistance, reducing the on-site construction workload, and avoiding the effect of injury

Active Publication Date: 2020-05-01
SICHUAN JIEBEITONG ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Another purpose of the present invention is to solve the complex on-site liquid dosing operation, heavy workload, and high cost caused by adding drag reducers, bactericides, anti-swelling agents, and drainage aids to the existing conventional slick water. question

Method used

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  • A kind of multifunctional cleaning drag reducing agent for shale gas fracturing and preparation method thereof
  • A kind of multifunctional cleaning drag reducing agent for shale gas fracturing and preparation method thereof
  • A kind of multifunctional cleaning drag reducing agent for shale gas fracturing and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0029] The specific operation steps for preparing 1000g of multifunctional cleaning drag reducer for fracturing are as follows:

[0030] S1, external phase preparation: 80g glycerol carbonate and 100g allyl polyoxyethylene ether (structural formula CH 2 =CHCH 2 O(CH 2 CH 2 O) 4 H) Mix and stir evenly, set aside.

[0031] S2. Internal phase preparation: add 100g (2-acryloyloxy)ethoxybenzyltriethylammonium chloride, 50g N-vinylpyrrolidone, and 150g potassium formate into 519.98g of water, stir and dissolve evenly, and set aside .

[0032] S3. Emulsion polymerization: Pour the prepared external phase into the reaction vessel, then place the reaction vessel in a constant temperature water bath at 20-25°C, turn on the agitator, and slowly add the prepared internal phase solution into the external phase to form a Lotion base. Simultaneously pass nitrogen gas and stir at high speed to remove oxygen. After stirring for 20min-40min, add 0.01g of ammonium persulfate and 0.01g of ...

Embodiment 2

[0034] The specific operation steps for preparing 1000g of multifunctional cleaning drag reducer for fracturing are as follows:

[0035] S1, external phase preparation: 120g glycerol carbonate and 60g allyl polyoxyethylene ether (structural formula CH 2 =CHCH 2 O(CH 2 CH 2 O) 20 H) Mix and stir evenly, set aside.

[0036] S2. Internal phase preparation: add 140g of (2-acryloyloxy)ethoxybenzyltriethylammonium chloride, 79.9g of N-vinylpyrrolidone, and 200g of sodium acetate into 400g of water, stir and dissolve evenly, and set aside.

[0037] S3. Emulsion polymerization: Pour the prepared external phase into the reaction vessel, then place the reaction vessel in a constant temperature water bath at 20-25°C, turn on the agitator, and slowly add the prepared internal phase solution into the external phase to form a Lotion base. Simultaneously pass nitrogen gas at high speed and stir to remove oxygen. After stirring for 20min-40min, add 0.1g ammonium persulfate initiator int...

Embodiment 3

[0039] The specific operation steps for preparing 1000g of multifunctional cleaning drag reducer for fracturing are as follows:

[0040] S1, external phase preparation: 100g glycerol carbonate and 80g allyl polyoxyethylene ether (structural formula CH 2 =CHCH 2 O(CH 2 CH 2 O) 12 H) Mix and stir evenly, set aside.

[0041] S2. Internal phase preparation: add 120g (2-acryloyloxy)ethoxybenzyltriethylammonium chloride, 59.95g N-vinylpyrrolidone, and 180g sodium citrate into 460g of water, stir and dissolve evenly, and set aside .

[0042]S3. Emulsion polymerization: Pour the prepared external phase into the reaction vessel, then place the reaction vessel in a constant temperature water bath at 20-25°C, turn on the agitator, and slowly add the prepared internal phase solution into the external phase to form a Lotion base. Simultaneously pass nitrogen gas at high speed and stir to remove oxygen. After stirring for 20min-40min, add 0.05g of sodium bisulfite initiator into the ...

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Abstract

The invention discloses a multifunctional clean drag reducing agent used for shale gas fracturing. The drag reducing agent is prepared by an initiated polymerization reaction of an internal phase andan external phase under the action of an initiator; the external phase is composed of glycerol carbonate and allyl polyoxyethylene ether; and the internal phase is composed of (2-acryloyloxy)ethoxybenzyltriethylammonium chloride, N-vinylpyrrolidone, an organic salt and water. The preparation method comprises the following steps: separately preparing the external phase and the internal phase; moving the external phase into a reaction vessel, turning on stirring, adding the internal phase into the external phase, removing oxygen by introducing a nitrogen gas, performing stirring for 20-40min, adding the initiator dropwise, closing the reaction vessel, and performing a polymerization reaction to obtain the target drag reducing agent. The drag reducing agent provided by the invention integrates a plurality of functions such as resistance reduction, sterilization, swelling prevention and discharge aiding, and solves a plurality of problems, for example, on-site liquid dispensing operation is complicated, the workload is large and the costs are high because conventional slick water needs to add a plurality of medicines such as a drag reducing agent, a bactericide, an anti-swelling agentand a discharge aiding agent.

Description

technical field [0001] The invention belongs to the technical field of oil and gas well reservoir transformation, and in particular relates to a multifunctional clean drag reducer for shale gas fracturing and a preparation method thereof. Background technique [0002] Shale gas is a high-quality, efficient, clean and low-carbon energy. my country's shale oil and gas reserves are about 26×10 12 m 3 , accounting for about 5.7% of global shale gas reserves. Therefore, increasing the exploration and development of shale gas resources is conducive to changing the pattern of oil and gas resources in my country and alleviating the shortage of oil and gas resources. Shale reservoirs are characterized by low porosity and low permeability, and the reservoir permeability is generally less than 0.01×10 -3 μm 2 , the shale content is relatively high, generally 20-70%, and exploration and development are difficult. Most shale gas wells need reservoir reconstruction to obtain ideal pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/68C09K8/88C08F283/06C08F220/36C08F2/22
CPCC08F2/22C08F283/065C09K8/68C09K8/882C08F220/36
Inventor 徐太平曾斌周京伟
Owner SICHUAN JIEBEITONG ENERGY TECH CO LTD
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