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High temperature resistant cleansing emulsion or microemulsion fracturing fluid and preparation method thereof

A high-temperature, hydraulic technology, applied in chemical instruments and methods, drilling compositions, reagents, etc., can solve the problems of difficult sand mixing tanks, slow dissolution, and inconvenient on-site use.

Active Publication Date: 2012-12-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the biggest disadvantage of this system is that the viscosity is very high after dissolution, and it is difficult to pump into the sand mixing tank.
Synthetic polymer fracturing fluid can withstand higher temperatures, but its dissolution is relatively slow, and most of them are cross-linked, which is not very convenient for on-site use

Method used

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  • High temperature resistant cleansing emulsion or microemulsion fracturing fluid and preparation method thereof
  • High temperature resistant cleansing emulsion or microemulsion fracturing fluid and preparation method thereof
  • High temperature resistant cleansing emulsion or microemulsion fracturing fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0223] Example 1: Preparation of high temperature resistant clean emulsion fracturing fluid

[0224] The implementation steps of this embodiment are as follows:

[0225] Step A: Prepare oil phase and emulsifier mixture

[0226] Add the mixed emulsifier composed of 30 parts by weight of white oil phase and 3 parts by weight of Pingping plus O-10 and span80 to the reactor equipped with mechanical stirring device, nitrogen inlet, constant pressure funnel and thermometer. Stir at constant temperature under certain conditions to obtain a homogeneous mixture;

[0227] Step B: Preparation of the aqueous phase

[0228] Acrylamide monomer A, (meth)acrylic acid monomer B, acryloxyethyl dimethyl octadecyl ammonium chloride monomer C and acrylamido sodium p-benzoate monomer D according to their weight ratio 10:10:0.5:0.25 is dissolved in water, the ratio of monomer weight to water weight is 1:1, the total weight of the water phase is 70, and 0.1% EDTA disodium salt is added based on th...

Embodiment 2

[0233] Example 2: Preparation of high temperature resistant clean emulsion fracturing fluid

[0234] The implementation steps of this embodiment are as follows:

[0235] Step A: Prepare oil phase and emulsifier mixture

[0236] Add the mixed emulsifier composed of 38 parts by weight of kerosene oil phase and 4 parts by weight of OP-1.5 and OP-7 to the reactor equipped with mechanical stirring device, nitrogen inlet, constant pressure funnel and thermometer. Constant temperature stirring under the condition to obtain a homogeneous mixture;

[0237] Step B: Preparation of the aqueous phase

[0238] (Meth) acrylamide monomer A, maleic anhydride monomer B, acryloyloxyethyl dimethyl octadecyl ammonium chloride monomer C and acrylamido sodium terebenzoate monomer D according to Their weight ratio is 65:65:1.0:0.80 soluble in water, the ratio of monomer weight to water weight is 1:1, the total weight of the water phase is 70, and 0.1% EDTA based on the total weight of the above mo...

Embodiment 3

[0242] Example 3: Preparation of high temperature resistant clean emulsion fracturing fluid

[0243] The implementation steps of this embodiment are as follows:

[0244] Step A: Prepare oil phase and emulsifier mixture

[0245] Add the mixed emulsifier composed of 60 parts by weight of diesel oil phase and 6 parts by weight of TX-10 and span80 to the reactor equipped with mechanical stirring device, nitrogen inlet, constant pressure funnel and thermometer, under the conditions of temperature 35°C and 280rpm Stir at a constant temperature to obtain a homogeneous mixture;

[0246] Step B: Preparation of the aqueous phase

[0247] N-hydroxypropyl (meth)acrylamide monomer A, fumaric acid monomer B, acryloyloxyethyl dimethyl octadecyl ammonium chloride monomer C and acrylamido sodium terebenzoate Body D is dissolved in water according to their weight ratio of 90:75:1.6:0.40, the ratio of monomer weight to water weight is 1:1, the total weight of the water phase is 70, and the to...

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Abstract

The invention relates to a high temperature resistant cleansing emulsion or microemulsion fracturing fluid and a preparation method thereof. The emulsion fracturing fluid is composed of a continuous oil phase, a polymer (I)-containing dispersed water phase and an emulsifier. The preparation method of the emulsion fracturing fluid includes: preparing a mixed solution of the oil phase and the emulsifier, preparing a four-monomer containing water phase, conducting a polymerization reaction in the presence of an initiating agent, and other steps. The product provided in the invention has low apparent viscosity, and can dissolve rapidly. When the emulsion dissolves into gel, the emulsifier can have a synergistic effect with an association polymer, thus further improving and maintaining the viscosity, and helping to prevent leak-off and help flowback. An oxidation gel breaking way is employed for gel breaking, the gel can be completely broken, and the gel breaking solution has low viscosity and contains no residue. The emulsion fracturing fluid is easy to undergo flowback, and has low damage to the stratum.

Description

【Technical field】 [0001] The invention belongs to the technical field of petroleum exploitation. More specifically, the present invention relates to a high-temperature-resistant cleaning emulsion or microemulsion fracturing fluid, and also relates to a preparation method of the fracturing fluid. 【Background technique】 [0002] In the process of oil extraction, in order to obtain more economically valuable oil flow, it is usually necessary to perform fracturing treatment on low-permeability and ultra-low-permeability reservoirs, and artificially obtain some long fractures in the reservoir, so as to optimize the oil flow path. It is known that the fracturing fluid plays the role of transmitting pressure and carrying proppant during the fracturing process, so the fracturing fluid is required to maintain a certain viscosity at the formation temperature. Relevant research results show that due to the requirement of sand-carrying and obtaining a certain fracture width and fractur...

Claims

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Application Information

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IPC IPC(8): C09K8/68C08F220/56C08F220/06C08F220/34C08F220/58C08F222/06C08F222/02C08F220/54C08F212/14C08F230/02C08F4/40C08F4/04C08F4/30C08F4/34
CPCY02P20/141
Inventor 吕永利马利成李爱山
Owner CHINA PETROLEUM & CHEM CORP
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