阅读说明：本技术 用于油气藏酸化压裂增产措施的稠化自生酸体系及制备方法 (Thickening autogenous acid generating system for oil-gas reservoir acid fracturing production increasing measures and preparation method ) 是由 辛勇亮 伍嘉 林景禹 丁建锁 于 2019-11-12 设计创作，主要内容包括：本发明公开了一种用于油气藏酸化压裂增产措施的稠化自生酸体系及制备方法,其中所述用于油气藏酸化压裂增产措施的稠化自生酸体系,包括A组分与B组分,A组分与B组分按体积比为3:2,其中A组分包括融合剂、生酸主剂a和水,其中融合剂、生酸主剂a和水的重量比为0.2-0.5：15-33：60；B组分包括生酸主剂b、缓蚀剂、助排剂、铁离子稳定剂和水,其中：生酸主剂b与生酸主剂a的重量比为21-35：15-33；缓蚀剂、助排剂、铁离子稳定剂和水的体积比为0.4-0.8：0.4-1.2：0.4-0.8：37.2-38.8。本发明所述稠化酸液体系生酸浓度18-20％,与传统技术相比具有优秀的酸岩反应缓速性、能够有效实现酸液深穿透,沟通远端储层,达到深度酸压改造的目的。(The invention discloses a thickening self-acid-generating system for an oil and gas reservoir acidizing fracturing stimulation measure and a preparation method thereof, wherein the thickening self-acid-generating system for the oil and gas reservoir acidizing fracturing stimulation measure comprises a component A and a component B, the volume ratio of the component A to the component B is 3:2, the component A comprises a fusion agent, an acid-generating main agent a and water, and the weight ratio of the fusion agent to the acid-generating main agent a to the water is 0.2-0.5: 15-33: 60, adding a solvent to the mixture; the component B comprises an acid generating main agent B, a corrosion inhibitor, a cleanup additive, an iron ion stabilizer and water, wherein: the weight ratio of the acidogenic main agent b to the acidogenic main agent a is 21-35: 15-33; the volume ratio of the corrosion inhibitor, the cleanup additive, the iron ion stabilizer and the water is 0.4-0.8: 0.4-1.2: 0.4-0.8: 37.2-38.8. The thickening acid liquid system has 18-20% of acid generation concentration, has excellent acid-rock reaction slowness compared with the prior art, and can effectively realize deep penetration of acid liquid and communication with a remote reservoir stratum, thereby achieving the purpose of deep acid fracturing modification.)

1. A thickening self-acid-generating system for an acid fracturing stimulation measure of an oil-gas reservoir is characterized by comprising a component A and a component B, wherein the volume ratio of the component A to the component B is 3:2, and the component A and the component B are used for preparing a thickening self-acid-generating system

The component A comprises a fusion agent, a main acid-producing agent a and water, wherein the weight ratio of the fusion agent to the main acid-producing agent a to the water is 0.2-0.5: 15-33: 60;

the component B comprises an acid generating main agent B, a corrosion inhibitor, a cleanup additive, an iron ion stabilizer and water, wherein: the weight ratio of the acid-producing main agent b to the acid-producing main agent a is 21-35: 15-33; the volume ratio of the corrosion inhibitor, the cleanup additive, the iron ion stabilizer and the water is 0.4-0.8: 0.4-1.2: 0.4-0.8: 37.2-38.8.

2. The viscosified self acid generating system for use in acid fracturing stimulation of hydrocarbon reservoirs of claim 1, wherein the acid generating primary agent a is HO- (CH2O) n-H, n-10-100.

3. The viscosified autogenous acid generating system for use in acid fracturing stimulation of hydrocarbon reservoirs of claim 1, wherein the acid generating primary agent b is NH4 Cl.

4. The viscosified autogenous acid generating system for use in acid fracturing stimulation treatments for oil and gas reservoirs of claim 1, wherein the corrosion inhibitor is a mixture of hydroxyquinoline and benzyl chloride.

5. The viscosified autogenous acid generating system for use in acid fracture stimulation of oil and gas reservoirs of claim 1, wherein the cleanup additive is a polyether polyol or a mixture of polyether polyols.

6. The viscosified authigenic acid system for use in acid fracturing stimulation treatments for oil and gas reservoirs of claim 1, wherein the iron ion stabilizer is disodium ethylenediaminetetraacetate.

7. The viscosified autogenous acid generating system for use in acid fracturing stimulation of hydrocarbon reservoirs of claim 1, wherein the fluxing agent is xanthan gum.

8. A method of making a viscosified, autogenous acid generating system for use in acid fracturing stimulation of oil and gas reservoirs in any of claims 1 to 7 comprising the steps of:

step S1, preparing a component A;

step S2, preparing a component B;

and S3, fully mixing the component A and the component B according to the volume ratio of 3:2, placing the mixture in a normal temperature environment, and keeping stirring at a low speed to obtain the thickening self-acid generating system for the acid fracturing production increasing measures of the oil and gas reservoir.

9. The method of claim 8, wherein the a component comprises a fluxing agent, a main acid generating agent a and water, wherein the weight ratio of the fluxing agent, the main acid generating agent a and the water is 0.2-0.5: 15-33: 60, and the a component is prepared by thoroughly mixing the fluxing agent, the main acid generating agent a and the water according to the above ratio.

10. The method of making a viscosified self acid generating system for use in acid fracturing stimulation treatments of hydrocarbon reservoirs of claim 8, wherein the B component comprises an acid generating main agent B, a corrosion inhibitor, a cleanup additive, an iron ion stabilizer, and water, wherein: the weight ratio of the acid-producing main agent b to the acid-producing main agent a is 21-35: 15-33; the volume ratio of the corrosion inhibitor, the cleanup additive, the iron ion stabilizer and the water is 0.4-0.8: 0.4-1.2: 0.4-0.8: 37.2-38.8; the component B is prepared by fully mixing the acid-generating main agent B, the corrosion inhibitor, the cleanup additive, the iron ion stabilizer and water according to the proportion.

Technical Field

The invention relates to the technical field of oil and gas reservoir acidizing fracturing, in particular to a thickening self-acid generating system for an oil and gas reservoir acidizing fracturing production increasing measure and a preparation method thereof.

Background

In recent years, low-hole and low-permeability oil and gas fields are developed mainly by water injection, due to the reasons of poor physical properties, compatibility of injected water and stratum and the like, the phenomenon of insufficient injection of a water injection well is prominent, and the operation of acidizing and fracturing measures plays an important role in realizing the work of increasing the injection of the water injection well and increasing the yield of the oil field. The yield increasing principle is that the fracture pressure of stratum rock is reduced, acid liquor is squeezed into the stratum, the acid liquor flows in the stratum fracture and reacts with rock on the wall surface of the fracture, uneven corrosion grooves are formed on the wall surface of the fracture due to the fact that the wall surface of the fracture is not smooth and the rock is heterogeneous, and after pressure relief is finished, the rock on the wall surface which is not corroded supports the fracture and is not completely closed, so that an artificial fracture with certain flow conductivity is formed, and the productivity of an oil-gas field is improved.

The main factors influencing the length of the artificial fracture include rock type, acid liquor concentration, acid-rock reaction rate, formation temperature and the like. Aiming at carbonate reservoir acidizing fracturing measures, the biggest problem is to control the acid-rock reaction speed, and the acid liquor is required to still keep high acid liquor activity after entering the deep part of the fracture so as to etch the rock in the deep part of the fracture. However, the commonly used gelled acid and diverting acid system is a HCL solution with a certain concentration prepared on the ground, although the reaction rate of acid rock is reduced by measures such as increasing viscosity and the like, the effect is effective, and the effective action time of the acid solution is about 10-15min, so that the expected requirement cannot be met.

Disclosure of Invention

The invention aims to solve the technical problems and provides a thickening acid generating system for an oil-gas reservoir acidizing fracturing stimulation measure and a preparation method thereof.

In order to solve the technical problems, the technical scheme provided by the invention is as follows:

a thickening acid-generating system for oil-gas reservoir acid fracturing stimulation treatment comprises a component A and a component B, wherein the volume ratio of the component A to the component B is 3:2, wherein

The component A comprises a fusion agent, a main acid-producing agent a and water, wherein the weight ratio of the fusion agent to the main acid-producing agent a to the water is 0.2-0.5: 15-33: 60;

the component B comprises an acid generating main agent B, a corrosion inhibitor, a cleanup additive, an iron ion stabilizer and water, wherein: the weight ratio of the acid-producing main agent b to the acid-producing main agent a is 21-35: 15-33; the volume ratio of the corrosion inhibitor, the cleanup additive, the iron ion stabilizer and the water is 0.4-0.8: 0.4-1.2: 0.4-0.8: 37.2-38.8.

Further, the acid generating main agent a is HO- (CH2O) n-H, wherein n is 10-100.

Further, the acid generating main agent b is NH4 Cl.

Further, the corrosion inhibitor is a mixture of hydroxyquinoline and benzyl chloride.

Further, the cleanup additive is a polyether polyol or a mixture of polyether polyols.

Further, the iron ion stabilizer is disodium ethylene diamine tetraacetate.

Further, the fluxing agent is xanthan gum.

The preparation method of the thickened self-acid-generating system for the acidizing fracturing stimulation measures of the oil and gas reservoir comprises the following steps:

step S1, preparing a component A;

step S2, preparing a component B;

and S3, fully mixing the component A and the component B according to the volume ratio of 3:2, placing the mixture in a normal temperature environment, and keeping stirring at a low speed to obtain the thickening self-acid generating system for the acid fracturing production increasing measures of the oil and gas reservoir.

Further, the component A comprises a fluxing agent, a main acid-producing agent a and water, wherein the weight ratio of the fluxing agent to the main acid-producing agent a to the water is 0.2-0.5: 15-33: 60, and the component A is prepared by fully mixing the fluxing agent to the main acid-producing agent a and the water according to the proportion.

Further, the component B comprises an acid generating main agent B, a corrosion inhibitor, a cleanup additive, an iron ion stabilizer and water, wherein: the weight ratio of the acid-producing main agent b to the acid-producing main agent a is 21-35: 15-33; the volume ratio of the corrosion inhibitor, the cleanup additive, the iron ion stabilizer and the water is 0.4-0.8: 0.4-1.2: 0.4-0.8: 37.2-38.8; the component B is prepared by fully mixing the acid-generating main agent B, the corrosion inhibitor, the cleanup additive, the iron ion stabilizer and water according to the proportion.

The invention has the beneficial effects that:

the thickening acid liquid system has 18-20% of acid generation concentration, has excellent acid-rock reaction slowness compared with the prior art, and can effectively realize deep penetration of acid liquid and communication with a remote reservoir stratum, thereby achieving the purpose of deep acid fracturing modification.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more apparent, the present invention is further described in detail below with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.