CN105820807A - Retarded acid suitable for acidifying and plugging removal for loose sandstone and preparation method thereof - Google Patents
Retarded acid suitable for acidifying and plugging removal for loose sandstone and preparation method thereof Download PDFInfo
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- CN105820807A CN105820807A CN201510008468.XA CN201510008468A CN105820807A CN 105820807 A CN105820807 A CN 105820807A CN 201510008468 A CN201510008468 A CN 201510008468A CN 105820807 A CN105820807 A CN 105820807A
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Abstract
The invention discloses a retarded acid suitable for acidifying and plugging removal for loose sandstone and a preparation method thereof. The retarded acid comprises the following raw materials of hydrochloric acid, hydrofluoric acid, citric acid, ATMP, methanol, an acidizing corrosion inhibitor, organic phosphoric acid, a HX scale-inhibition dispersant, an emulsifier, a mutual solvent, a clay stabilizing agent and water; mass concentration of hydrochloric acid is 5-7%, and the mutual solvent is one of ethylene glycol butyl ether, butylene glycol ether, or diethylene glycol ether. The retarded acid can better solve the problem of large reaction speed difference of high speed mineral and low speed mineral, prolongs the acidifying time, achieves deep acidifying, effectively accelerates discharge of an acid solution after acidifying, prevents damage of a reservoir due to acid sludge generated by the acid solution and crude oil, does not generate secondary deposition during a plugging removal process, uses conventional chemical agents and industrial products which have no harm on human body, work equipment and oil casing, and is safe and reliable for usage.
Description
Technical field
The present invention relates to the preparation method of a kind of retarded acid, a kind of retarded acid being applicable to loose sand acidifying de-plugging and preparation method.
Background technology
Currently in order to improve the ultimate recovery in oil field, under development take a lot of well stimulation, wherein acidifying is one of Main Yield-increasing measure, mud acid is the modal acid fluid system of one for sandstone reservoir acidifying, the mixed acid that it is hydrochloric acid and Fluohydric acid. forms in different proportions, sandstone reservoirs regular mud acid processes, owing to relieving formation Shanghai, improve the permeability of near wellbore zone, therefore there is certain effect as an oilfield stimulation measure, but mud acid but to oil well pipe corrosion bigger, reduce the service life of tubing and casing, stratum is caused and caves in, cause old formation blockage.It is acidified by dissolving formation rock mineral and blocking material simultaneously, while improving reservoir permeability, during acidizing treatment, also brings some new injuries.
If acid formula and additive application are improper, with formation rock and fluid system, such as heavy hydrocarbon, highly mineralized formation brines etc. are incompatible, and construction parameter is unreasonable, and reaction produces the precipitation of secondary product, such as calcium fluoride (CaF2), alkali metal fluorosilicates and fluoaluminate, the fluoride of aluminum and hydroxide, iron compound etc., hydration and expansion of clay, fine migration, emulsifying, acid sludge etc. is all the injury that may bring in acidization.The quality of final acidizing effect will depend upon which to be improved reservoir permeability and the result of injury two aspect comprehensive functions.
The surface area of clay is typically the most thousands of times of the hundreds times of sandstone；Most of acid solutions by consume with the reaction of clay in rather than consume with the reaction of quartz particles, the active penetration depth of acid solution is less, so reducing response speed, being allowed to relax is uniformly the problem of current conventional acidulation.
Summary of the invention
It is an object of the invention to provide a kind of response speed relaxes, in-place permeability the is high retarded acid being applicable to loose sand acidifying de-plugging and preparation method, with the problem solving to propose in above-mentioned background technology.
For achieving the above object, the present invention provides following technical scheme:
A kind of retarded acid being applicable to loose sand acidifying de-plugging, includes according to the raw material of weight portion: hydrochloric acid 20-30 part, Fluohydric acid. 10-15 part, citric acid 5-10 part, ATMP 5-10 part, methanol 5-8 part, acidification corrosion inhibitor 5-8 part, organic phosphoric acid 3-5 part, HX dirt dispersion agent 3-4 part, emulsifying agent 2-3 part, mutual solvent 1-3 part, clay stabilizer 1-2 part, water 60-70 part.
As the further scheme of the present invention: the mass concentration of described hydrochloric acid is 5-7%.
As the further scheme of the present invention: described acidification corrosion inhibitor is EL-21 acidification corrosion inhibitor or YHS-2 acidification of oil gas well corrosion inhibiter.
As the further scheme of the present invention: described organic phosphoric acid is the one in diethylenetriamine pentamethylene phosphoric acid, ATMP and carboxyl ethylidene diphosphonic acid.
As the further scheme of the present invention: described mutual solvent is the one in ethylene glycol monobutyl ether, butanediol ether or diethylene glycol ether.
As the present invention further scheme: described clay stabilizer is potassium chloride.
The preparation method of the described retarded acid being applicable to loose sand acidifying de-plugging, specifically comprises the following steps that
(1) each raw material is weighed according to weight portion；
(2) hydrochloric acid, Fluohydric acid., citric acid, ATMP, methanol, organic phosphoric acid and water are separately added into Agitation Tank, at a temperature of 20-30 DEG C, are sufficiently stirred for 15-30min；
(3) acidification corrosion inhibitor, HX dirt dispersion agent, emulsifying agent, clay stabilizer and mutual solvent are poured in reaction bulb, reaction bulb is put into room temperature concussion 10-20min in ultrasonic cleaner；
(4) obtain retarded acid by being sufficiently stirred for 20-30min during solution pours Agitation Tank in reaction bulb and load accumulating tank.
Compared with prior art, the invention has the beneficial effects as follows:
The present invention can preferably solve loose sand high speed mineral and the problem of the huge response speed gap of low speed mineral, extend acidificatoin time, reach deep acidizing, after effective acceleration acidifying, acid solution is discharged, preventing acid solution and crude oil from producing acid sludge and cause reservoir damage, do not produce secondary precipitation during de-plugging, use is all conventional chemical agent and industrial goods, to human body, implement and tubing and casing all without producing injury, safe and reliable.
Detailed description of the invention
Below in conjunction with detailed description of the invention, the technical scheme of this patent is described in more detail.
Embodiment 1
A kind of be applicable to loose sand acidifying de-plugging retarded acid, include according to the raw material of weight portion: mass concentration be 5% hydrochloric acid 20 parts, Fluohydric acid. 10 parts, citric acid 5 parts, ATMP 5 parts, methanol 5 parts, EL-21 acidification corrosion inhibitor 5 parts, diethylenetriamine pentamethylene phosphoric acid 3 parts, HX dirt dispersion agent 3 parts, emulsifying agent 2 parts, ethylene glycol monobutyl ether 1 part, 1 part of potassium chloride, 60 parts of water.
The preparation method of the described retarded acid being applicable to loose sand acidifying de-plugging, specifically comprises the following steps that
(1) each raw material is weighed according to weight portion；
(2) hydrochloric acid, Fluohydric acid., citric acid, ATMP, methanol, diethylenetriamine pentamethylene phosphoric acid and water are separately added into Agitation Tank, at a temperature of 20 DEG C, are sufficiently stirred for 15min；
(3) EL-21 acidification corrosion inhibitor, HX dirt dispersion agent, emulsifying agent, potassium chloride and ethylene glycol monobutyl ether are poured in reaction bulb, reaction bulb is put into room temperature concussion 10min in ultrasonic cleaner；
(4) obtain retarded acid by being sufficiently stirred for 20min during solution pours Agitation Tank in reaction bulb and load accumulating tank.
Embodiment 2
A kind of be applicable to loose sand acidifying de-plugging retarded acid, include according to the raw material of weight portion: mass concentration be 5.5% hydrochloric acid 23 parts, Fluohydric acid. 12 parts, citric acid 6 parts, ATMP 7 parts, methanol 5.5 parts, EL-21 acidification corrosion inhibitor 6 parts, diethylenetriamine pentamethylene phosphoric acid 3.5 parts, HX dirt dispersion agent 3.2 parts, emulsifying agent 2.2 parts, ethylene glycol monobutyl ether 1.5 parts, 1.2 parts of potassium chloride, 62 parts of water.
The preparation method of the described retarded acid being applicable to loose sand acidifying de-plugging, specifically comprises the following steps that
(1) each raw material is weighed according to weight portion；
(2) hydrochloric acid, Fluohydric acid., citric acid, ATMP, methanol, diethylenetriamine pentamethylene phosphoric acid and water are separately added into Agitation Tank, at a temperature of 22 DEG C, are sufficiently stirred for 18min；
(3) EL-21 acidification corrosion inhibitor, HX dirt dispersion agent, emulsifying agent, ethylene glycol monobutyl ether and potassium chloride are poured in reaction bulb, reaction bulb is put into room temperature concussion 12min in ultrasonic cleaner；
(4) obtain retarded acid by being sufficiently stirred for 22min during solution pours Agitation Tank in reaction bulb and load accumulating tank.
Embodiment 3
A kind of be applicable to loose sand acidifying de-plugging retarded acid, include according to the raw material of weight portion: mass concentration be 6% hydrochloric acid 26 parts, Fluohydric acid. 13 parts, citric acid 7 parts, ATMP 8 parts, methanol 6 parts, EL-21 acidification corrosion inhibitor 6 parts, ATMP 4 parts, HX dirt dispersion agent 3.5 parts, emulsifying agent 2.5 parts, butanediol ether 2 parts, 1.5 parts of potassium chloride, 65 parts of water.
The preparation method of the described retarded acid being applicable to loose sand acidifying de-plugging, specifically comprises the following steps that
(1) each raw material is weighed according to weight portion；
(2) hydrochloric acid, Fluohydric acid., citric acid, ATMP, methanol, ATMP and water are separately added into Agitation Tank, at a temperature of 25 DEG C, are sufficiently stirred for 22min；
(3) EL-21 acidification corrosion inhibitor, HX dirt dispersion agent, emulsifying agent, potassium chloride and butanediol ether are poured in reaction bulb, reaction bulb is put into room temperature concussion 15min in ultrasonic cleaner；
(4) obtain retarded acid by being sufficiently stirred for 25min during solution pours Agitation Tank in reaction bulb and load accumulating tank.
Embodiment 4
A kind of be applicable to loose sand acidifying de-plugging retarded acid, include according to the raw material of weight portion: mass concentration be 6.5% hydrochloric acid 28 parts, Fluohydric acid. 14 parts, citric acid 9 parts, ATMP part, methanol 7 parts, YHS-2 acidification of oil gas well corrosion inhibiter 7 parts, ATMP 4.5 parts, HX dirt dispersion agent 3.8 parts, emulsifying agent 2.8 parts, butanediol ether 2.5 parts, 1.8 parts of potassium chloride, 68 parts of water.
The preparation method of the described retarded acid being applicable to loose sand acidifying de-plugging, specifically comprises the following steps that
(1) each raw material is weighed according to weight portion；
(2) hydrochloric acid, Fluohydric acid., citric acid, ATMP, methanol, ATMP and water are separately added into Agitation Tank, at a temperature of 28 DEG C, are sufficiently stirred for 25min；
(3) YHS-2 acidification of oil gas well corrosion inhibiter, HX dirt dispersion agent, emulsifying agent, butanediol ether and potassium chloride are poured in reaction bulb, reaction bulb is put into room temperature concussion 18min in ultrasonic cleaner；
(4) obtain retarded acid by being sufficiently stirred for 28min during solution pours Agitation Tank in reaction bulb and load accumulating tank.
Embodiment 5
A kind of be applicable to loose sand acidifying de-plugging retarded acid, include according to the raw material of weight portion: mass concentration be 7% hydrochloric acid 30 parts, Fluohydric acid. 15 parts, citric acid 10 parts, ATMP 10 parts, methanol 8 parts, YHS-2 acidification of oil gas well corrosion inhibiter 8 parts, carboxyl ethylidene diphosphonic acid 5 parts, HX dirt dispersion agent 4 parts, emulsifying agent 3 parts, diethylene glycol ether 3 parts, 2 parts of potassium chloride, 70 parts of water.
The preparation method of the described retarded acid being applicable to loose sand acidifying de-plugging, specifically comprises the following steps that
(1) each raw material is weighed according to weight portion；
(2) hydrochloric acid, Fluohydric acid., citric acid, ATMP, methanol, carboxyl ethylidene diphosphonic acid and water are separately added into Agitation Tank, at a temperature of 30 DEG C, are sufficiently stirred for 30min；
(3) YHS-2 acidification of oil gas well corrosion inhibiter, HX dirt dispersion agent, emulsifying agent, diethylene glycol ether and potassium chloride are poured in reaction bulb, reaction bulb is put into room temperature concussion 20min in ultrasonic cleaner；
(4) obtain retarded acid by being sufficiently stirred for 30min during solution pours Agitation Tank in reaction bulb and load accumulating tank.
The present invention can preferably solve loose sand high speed mineral and the problem of the huge response speed gap of low speed mineral, extend acidificatoin time, reach deep acidizing, after effective acceleration acidifying, acid solution is discharged, preventing acid solution and crude oil from producing acid sludge and cause reservoir damage, do not produce secondary precipitation during de-plugging, use is all conventional chemical agent and industrial goods, to human body, implement and tubing and casing all without producing injury, safe and reliable.
Above the better embodiment of this patent is explained in detail, but this patent is not limited to above-mentioned embodiment, in the ken that one skilled in the relevant art is possessed, it is also possible to various changes can be made on the premise of without departing from this patent objective.
Claims (7)
1. the retarded acid being applicable to loose sand acidifying de-plugging, it is characterized in that, include according to the raw material of weight portion: hydrochloric acid 20-30 part, Fluohydric acid. 10-15 part, citric acid 5-10 part, ATMP 5-10 part, methanol 5-8 part, acidification corrosion inhibitor 5-8 part, organic phosphoric acid 3-5 part, HX dirt dispersion agent 3-4 part, emulsifying agent 2-3 part, mutual solvent 1-3 part, clay stabilizer 1-2 part, water 60-70 part.
The retarded acid being applicable to loose sand acidifying de-plugging the most according to claim 1, it is characterised in that the mass concentration of described hydrochloric acid is 5-7%.
The retarded acid being applicable to loose sand acidifying de-plugging the most according to claim 1, it is characterised in that described acidification corrosion inhibitor is EL-21 acidification corrosion inhibitor or YHS-2 acidification of oil gas well corrosion inhibiter.
The retarded acid being applicable to loose sand acidifying de-plugging the most according to claim 1, it is characterised in that described organic phosphoric acid is the one in diethylenetriamine pentamethylene phosphoric acid, ATMP and carboxyl ethylidene diphosphonic acid.
The retarded acid being applicable to loose sand acidifying de-plugging the most according to claim 1, it is characterised in that described mutual solvent is the one in ethylene glycol monobutyl ether, butanediol ether or diethylene glycol ether.
The retarded acid being applicable to loose sand acidifying de-plugging the most according to claim 1, it is characterised in that described clay stabilizer is potassium chloride.
7. the preparation method of the retarded acid being applicable to loose sand acidifying de-plugging as described in claim 1-6 is arbitrary, it is characterised in that specifically comprise the following steps that
(1) each raw material is weighed according to weight portion；
(2) hydrochloric acid, Fluohydric acid., citric acid, ATMP, methanol, organic phosphoric acid and water are separately added into Agitation Tank, at a temperature of 20-30 DEG C, are sufficiently stirred for 15-30min；
(3) acidification corrosion inhibitor, HX dirt dispersion agent, emulsifying agent, clay stabilizer and mutual solvent are poured in reaction bulb, reaction bulb is put into room temperature concussion 10-20min in ultrasonic cleaner；
(4) obtain retarded acid by being sufficiently stirred for 20-30min during solution pours Agitation Tank in reaction bulb and load accumulating tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510008468.XA CN105820807A (en) | 2015-01-08 | 2015-01-08 | Retarded acid suitable for acidifying and plugging removal for loose sandstone and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510008468.XA CN105820807A (en) | 2015-01-08 | 2015-01-08 | Retarded acid suitable for acidifying and plugging removal for loose sandstone and preparation method thereof |
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| CN105820807A true CN105820807A (en) | 2016-08-03 |
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| CN201510008468.XA Pending CN105820807A (en) | 2015-01-08 | 2015-01-08 | Retarded acid suitable for acidifying and plugging removal for loose sandstone and preparation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113913177A (en) * | 2021-12-13 | 2022-01-11 | 胜利油田新海兴达实业集团有限责任公司 | Composite acid for oil field oil-water well and preparation method thereof |
| CN115678523A (en) * | 2021-07-30 | 2023-02-03 | 中国石油天然气股份有限公司 | Acidification blockage relieving system |
| CN115873573A (en) * | 2022-12-27 | 2023-03-31 | 濮阳市宏华石油工程技术有限公司 | Acidizing plugging removal liquid, preparation method and application |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5529125A (en) * | 1994-12-30 | 1996-06-25 | B. J. Services Company | Acid treatment method for siliceous formations |
| CN101747881A (en) * | 2010-01-14 | 2010-06-23 | 胜利油田胜海节能设备有限公司 | Descaling and blockage relieving agent for oil-water well |
| CN101864287A (en) * | 2010-06-08 | 2010-10-20 | 西安石油大学 | Composite retarded acid |
| CN102120930A (en) * | 2010-11-29 | 2011-07-13 | 尚伟 | Oil reservoir modification acid liquor and oil production method by using same |
-
2015
- 2015-01-08 CN CN201510008468.XA patent/CN105820807A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5529125A (en) * | 1994-12-30 | 1996-06-25 | B. J. Services Company | Acid treatment method for siliceous formations |
| CN101747881A (en) * | 2010-01-14 | 2010-06-23 | 胜利油田胜海节能设备有限公司 | Descaling and blockage relieving agent for oil-water well |
| CN101864287A (en) * | 2010-06-08 | 2010-10-20 | 西安石油大学 | Composite retarded acid |
| CN102120930A (en) * | 2010-11-29 | 2011-07-13 | 尚伟 | Oil reservoir modification acid liquor and oil production method by using same |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115678523A (en) * | 2021-07-30 | 2023-02-03 | 中国石油天然气股份有限公司 | Acidification blockage relieving system |
| CN115678523B (en) * | 2021-07-30 | 2024-03-01 | 中国石油天然气股份有限公司 | Acid-based blocking removal system |
| CN113913177A (en) * | 2021-12-13 | 2022-01-11 | 胜利油田新海兴达实业集团有限责任公司 | Composite acid for oil field oil-water well and preparation method thereof |
| CN113913177B (en) * | 2021-12-13 | 2022-04-26 | 胜利油田新海兴达实业集团有限责任公司 | Composite acid for oil field oil-water well and preparation method thereof |
| CN115873573A (en) * | 2022-12-27 | 2023-03-31 | 濮阳市宏华石油工程技术有限公司 | Acidizing plugging removal liquid, preparation method and application |
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