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A kind of emulsified acid liquid for acidification of oil and gas reservoir and preparation method thereof

A technology of emulsified acid and oil and gas reservoirs, which is applied in the field of emulsified acid for acidizing oil and gas reservoirs and its preparation, which can solve the problems of high friction, fluid loss, and fast reaction speed of acid fluid, and achieve fluid loss reduction performance, low friction, etc. The effect of retarding and slowing down the reaction speed of acid rock

Active Publication Date: 2022-07-22
PETRO KING OILFIELD TECH +1
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  • Abstract
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  • Claims
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Problems solved by technology

[0003] The purpose of the present invention is to provide an emulsified acid solution for acidification of oil and gas reservoirs and its preparation method, which solves the problems of too fast reaction speed, large frictional resistance and serious filtration loss of acid solution used in acid rock reaction in the prior art

Method used

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preparation example Construction

[0028] The preparation method of above-mentioned emulsified acid solution comprises the steps:

[0029] S1. Fully mix diesel oil and emulsifier according to the ratio to make the oil phase, and fully mix the corrosion inhibitor, iron ion stabilizer, drainage aid, anti-slag agent, acid and water according to the ratio to make the acid phase, ready for use;

[0030] S2, the oil phase and the acid phase are stirred at a high speed for more than 30 seconds at a rotation speed greater than 5000 rpm according to the ratio to obtain an emulsified acid solution. Preferably, the stirring speed is 10000-12000 rpm, and the stirring time is 2-4min.

[0031] The invention is an acid-in-oil acid emulsified acid liquid used in the acidizing and production stimulation measures of oil and gas reservoirs. Under the premise that the pressure is lower than the fracture pressure of the formation, the acid liquid is squeezed into the formation through the ground high-pressure pumping equipment, and...

Embodiment 1

[0038] Prepare 100mL emulsified acid solution: prepare 30mL oil phase separately, in which 28mL diesel oil, 2mL emulsifier, mix well and set aside; prepare 70mL acid phase separately, in which 42.96mL 31% concentrated hydrochloric acid, 0.8mL corrosion inhibitor, 0.65mL ethyl acetate Disodium diaminetetraacetate, 0.65mL drainage aid, 0.65mL anti-slag agent, 24.29mL water; stir at 11,000 rpm for 3min, fully mix 30mL oil phase and 70mL acid phase, and finally prepare 100mL acid-in-oil emulsion acid. Among them, the emulsifier uses diesel oil as a solvent, and 35% of dodecylbenzene sulfonic acid and 10% of sodium oleate are added to the diesel oil to make an emulsifier; the corrosion inhibitor uses water as a solvent and is dissolved in water. Add 35% hydroxyquinoline and 10% benzyl chloride in mass volume ratio to prepare corrosion inhibitor; use water as solvent for drainage aid, add 18% mass volume polyether polyol in water to prepare A drainage aid; an anti-slag agent is pre...

Embodiment 2

[0042]Prepare 100mL emulsified acid solution: prepare 30mL oil phase separately, in which 27.6mL diesel oil, 2.4mL emulsifier, mix well, and set aside; prepare 70mL acid phase separately, in which 42.96mL 31% concentrated hydrochloric acid, 0.35mL corrosion inhibitor, 0.35mL mL disodium EDTA, 0.35 mL drainage aid, 0.35 mL anti-slag agent, 25.64 mL water; stir at 10,000 rpm for 4 min, fully mix 30 mL of oil phase and 70 mL of acid phase, and finally prepare 100 mL of acid-in-oil Type emulsified acid. Among them, the emulsifier uses diesel oil as a solvent, and adds 20% of dodecylbenzene sulfonic acid and 5% of sodium oleate in a mass-to-volume ratio to the diesel oil to make an emulsifier; the corrosion inhibitor uses water as a solvent and is dissolved in water Add 20% of hydroxyquinoline and 5% of benzyl chloride in a mass-to-volume ratio to prepare a corrosion inhibitor; use water as a solvent for the drainage aid, add 15% of a mass-to-volume ratio of polyether polyol to wat...

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Abstract

The invention relates to an emulsified acid solution for acidification of oil and gas reservoirs and a preparation method thereof. The emulsified acid solution comprises an oil phase and an acid phase, the oil phase comprises diesel oil and an emulsifier, and the acid phase comprises a corrosion inhibitor, iron ions Stabilizers, drainage aids, anti-slag agents and acids. The emulsified acid liquid for acidification of oil and gas reservoirs of the present invention can be applied to acidification and production enhancement measures of medium and high temperature carbonate rock and limestone reservoirs, has low frictional resistance, effectively slows down the reaction speed of acid rock, reduces filtration loss, and can effectively Realize deep penetration of acid liquid, communicate with remote reservoirs, and achieve the purpose of deep acidification.

Description

technical field [0001] The invention relates to the technical field of petroleum exploitation, in particular to an emulsified acid solution for acidification of oil and gas reservoirs and a preparation method thereof. Background technique [0002] After drilling and completion, due to the influence of mud, cementing and other operations, it will cause mud pollution, cement slurry pollution, compaction pollution, etc. in the wellbore accessories. In most cases, acidizing operations are required to remove the pollution near the wellbore and obtain natural productivity. . At the same time, for old wells, as the development enters the middle and late stages, the near-wellbore zone is blocked by the formation rock particles carried by the production, and the development becomes more and more difficult. Therefore, acidification is an effective measure to increase production. However, the existing acidizing working fluids generally have the characteristics of too fast acid-rock re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/74
CPCC09K8/74
Inventor 王金龙赵锦栋林景禹伍嘉辛勇亮
Owner PETRO KING OILFIELD TECH
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