Multifunctional reservoir reconstruction liquid and preparation method therefor

A reservoir modification and multi-functional technology, applied in the field of reservoir modification fluid and its preparation, can solve the problems of temperature resistance, sand-carrying property, economical reservoir adaptability can not fully meet the construction requirements, etc., to increase reservoir High production capacity, small secondary damage, good for environmental protection

CN105219370AActive Publication Date: 2016-01-06CHENGDU BAICHUN PETROLEUM TECH +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2016-01-06

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Abstract

The invention relates to the technical fields of oilfield chemistry, reservoir reconstruction and fracturing production increase and particularly relates to multifunctional reservoir reconstruction liquid and a preparation method therefor. The weakly-acidic multifunctional reservoir reconstruction liquid provided by the invention contains a base solution for the reservoir reconstruction liquid, a structure reinforcing agent for the reservoir reconstruction liquid and ammonium persulfate, wherein the base solution for the reservoir reconstruction liquid is prepared from the following ingredients in percentage by weight: 0.3-0.6% of thickening agent for the reservoir reconstruction liquid, 0.3-0.4% of regulator for the reservoir reconstruction liquid, 1% of potassium chloride and the balance of water. The multifunctional reservoir reconstruction liquid and the preparation method therefor have the following advantages that the multifunctional reservoir reconstruction liquid has efficient swelling resistance and a precipitate generation preventing function, and damage caused by the action between reservoirs and reservoir fluid can be effectively lowered; the viscosity is relatively low, so that seam height is effectively controlled; the viscous elasticity is excellent, so that the sand carrying performance of a system is improved; and the multifunctional reservoir reconstruction liquid has the characteristics that the damage is low, no residue is caused, and flowback fluid can be recovered and reused.
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Description

technical field

[0001] The invention relates to the technical fields of oilfield chemistry, reservoir transformation and fracturing stimulation, in particular to a multifunctional reservoir transformation fluid and a preparation method thereof. Background technique

[0002] Reservoir stimulation fluid is a kind of fluid used to create fractures and transport proppant along the fracture length direction in reservoir stimulation construction. A successful and efficient reservoir stimulation construction requires many related special properties. Therefore, reservoir stimulation fluid is one of the key factors to determine the success or failure of reservoir construction and construction effect.

[0003] There are many types of reservoir stimulation fluids, and water-based reservoir stimulation fluids have been dominant since the beginning of development. After more than 60 years of development, they have played an increasingly important role in the field of oil and gas field de...

Examples

Embodiment 1

[0073] A multifunctional reservoir reconstruction fluid, prepared by the following steps:

[0074] (A) First synthesize the thickener for reservoir stimulation fluid

[0075] Add bisacrylamide, vinylpyrrolidone, cationic unsaturated monomer, anionic unsaturated monomer and water into the reaction kettle and mix evenly, add caustic soda to adjust the pH value of the system to 9, add emulsifier and co-solvent, and pass nitrogen for two hours , add an initiator, react at a reaction temperature of 40°C for 5 hours, hydrolyze at 85°C for 8 hours to obtain a colloidal product, granulate, dry, and pulverize the colloid to obtain a thickener for reservoir reconstruction fluid;

[0076] In the above reaction system, taking the total reaction system mass as 100%, diacrylic acid accounts for 22.5% of the total mass, vinylpyrrolidone accounts for 6% of the total mass, dodecyldimethyldiallyl ammonium chloride accounts for 4% of the total mass, vinyl sulfonic acid sodium salt accounts for ...