CN1429963A - Water injection well nitric acid powder-acid liquid system and acidification process - Google Patents
Water injection well nitric acid powder-acid liquid system and acidification process Download PDFInfo
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- CN1429963A CN1429963A CN 01144897 CN01144897A CN1429963A CN 1429963 A CN1429963 A CN 1429963A CN 01144897 CN01144897 CN 01144897 CN 01144897 A CN01144897 A CN 01144897A CN 1429963 A CN1429963 A CN 1429963A
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Abstract
A nitric acid powder-acid liquid system for water injection well is composed of conventional well-flushing liquid, nitric acid powder solution and hydrochloric acid solution. Its acidifying process for unblocking the oil-bearing stratum by removing heavy oil and asphalt includes such steps as flushing well, sequentially injecting leading liquid, nitric acid powder solution, isolating liquid, hydrochloric acid solution and displacing liquid, closing well, reacting for 6-12 hr, and flushing well with aerated water.
Description
Technical Field
The invention belongs to the technology of increasing the injection of a water injection well in petroleum development, and particularly relates to a nitric acid powder acid liquor system and an acidification process for the water injection well.
Background
In oil field production, acidification is a common measure for oil layer blockage removal, and the prior publicly known common acidification liquid (such as Changqing oil field company of China oil and gas Co., Ltd.) mainly contains traditional acid liquid such as hydrochloric acid, earth acid and the like, can effectively remove oil passage blockage partially, but has the main defects of low blockage removal efficiency, new sediment blockage caused when the acid liquid amount or concentration is not matched properly, and very limited dissolution on rocks and clay. When high-concentration hydrochloric acid acts with stratum rock, a large amount of calcium chloride, magnesium chloride and the like are generated due to the strong dissolving capacity of the hydrochloric acid. These salts, when dissolved, increase the viscosity of the water and make it difficult to remove. Hydrofluoric acid, when present in too high a concentration, when it reacts with the carbonate, produces many calcium fluoride and magnesium fluoride precipitates that are more difficult to remove. Improper increase of acid liquor concentration not only causes acid liquor waste, but also can severely corrode metal pipes and construction equipment. The dilute acid has reduced carbonate dissolving capacity and may not have any effect.
The invention content is as follows:
the invention aims to solve the problems of difficult removal of dissolved substances and near-well blockage by utilizing the extremely high dissolving capacity of aqua regia formed by nitric acid and hydrochloric acid in a stratum and generating soluble salts by reacting with stratum blockage without generating secondary precipitates.
The invention is realized by the following steps: a nitric acid powder acid liquid system for a water injection well comprises conventional well flushing liquid, pad fluid and nitric acid powder liquid, wherein the pad fluid is formed by mixing CH961 low-damage liquid and clear water according to the weight ratio of 3: 1, and the nitric acid powder liquid is formed by compounding 20% of nitric acid powder, 2% of nitricacid corrosion inhibitor and 1% of iron ion stabilizer; the hydrochloric acid solution consists of 15 percent of hydrochloric acid, 0.5 percent of anti-swelling agent, 1 percent of corrosion inhibitor, 0.1 percent of active agent and 1 percent of iron ion stabilizer.
The method comprises connecting a ground cement truck and a wellhead acidized oil pipe column, injecting CH961 low-damage pad fluid from an oil pipe at a small discharge amount which is 1.5 times of the volume of the oil pipe from a wellhead to a treatment layer after conventional well flushing and water outlet cleaning, and then pressurizing to increase the discharge amount and inject nitric acid powder fluid at an amount of 1-3m per meter of oil layer3Then squeeze in spacer fluid, i.e. flushing fluid 2m3Then continuously extruding hydrochloric acid solution with the dosage of 2 times of nitric acid powder solution, finally extruding a displacement solution of the volume of the oil pipe, namely a well-flushing solution, closing the well and reacting for 6-12 hours, pumping vaporized water formed by mixing air with the conventional well-flushing solution into the oil pipe to flush the well, and pumping single-injection liquid with the discharge capacity of 0.58m3Permin, the discharge capacity of the cement truck is 0.2m during mixed injection3Min, 15m of discharge capacity of air compressor3Permin, finally bet.
The principle of the invention is as follows: from HNO3Mixing the powder with HCL to generate chloronitrous acid acyl (NOCL):
after the generated nitrous acid chloride is decomposed, atomic chlorine { CL } is generated
The chlorine atom has extremely strong oxidizing power, and can react with most metals and oxides thereof to generate soluble salts. When the nitric acid powder is acidified, the corrosion inhibitor special for nitric acid is used, so that the corrosion to the oil pipe sleeve is avoided. During construction, raw materials such as low-damage liquid and the like are used for protecting the stratum. The acidification of the nitric acid powder is not limited by the stratum, and the acidification of the nitric acid powder (which is synergistic with the hydrochloric acid) plays a role when the acid sensitivity of the underground stratum to the hydrochloric acid occurs. Experiments and practices prove that the concentration of the nitric acid powder is between 5 and 30 percent, and the collapse of the stratum framework cannot be caused.
The underground tool for acidizing the nitric acid powder adopts a conventional acidizing drilling tool combination, and for a sleeve broken well or a well needing an isolation layer, a hydraulic differential pressure packer and an offset nozzle are arranged; if single-layer or co-injection well is injected, the cross head can be directly arranged below the perforation section for construction at 0.5 m. The invention has the following effects:
because the invention adopts the nitric acid powder acidizing liquid system and the construction process, the nitric acid powder is used for complexing the nitric acid into solid powder, the defects of strong corrosivity, strong irritation, inconvenient transportation and the like of the nitric acid are overcome, the advantages of strong acidity, strong oxidizing property and the like of the nitric acid are maintained, the nitric acid forms aqua regia when the proportion of subsequently extruded hydrochloric acid reaches 1: 3, the reactant of the aqua regia and the stratum is easy to dissolve salt, no secondary precipitate exists, the 150-degree-of-charge high temperature of 200 ℃ generated by the aqua regia in the stratum is heated and removed, the purpose of thoroughly dredging an oil layer is achieved, and the treatment radius can reach 5-7 m. The aqua regia has the characteristic of resisting stratum acid sensitivity, is not influenced by a speed sensitive effect caused by particle cloud migration in a reservoir, is suitable for acidizing and modifying sandstone, limestone and argillaceous strata, is not limited by the stratum, resists acid sensitivity and speed sensitivity, has a large concentration range, and cannot cause stratum framework collapse between 5 and 30 percent. And the corrosion inhibitor matched with the corrosion inhibitor is adopted, so that the corrosion to the oil casing is avoided. The method is applied to water injection wells with low oil layer permeability, relatively developed bacteria and more ferrous sulfide precipitates.
Detailed description of the invention
Changqing oil field company, oil house zhuang oil field 126-11 well, new well 3 month 23 year 1998,the injection is carried out in 5 months in 98 years, a Y9 layer is injected singly, the oil pressure is 14.5MPa, the casing pressure is 14.5MPa, water is not injected, and the data analysis is caused by stratum blockage and drilling pollution. The Y9 layer was acidified with nitric acid powder on day 5/7/98 years. The pre-solution is 33% low damage solution 5m33m of 20% nitric acid powder liquid is extruded32m of spacer fluid315% hydrochloric acid solution 6m3And reducing the working pressure from 18MPa to 8MPa, closing the well, reacting for 1 hour, and then vaporizing and washing the well by using special well washing liquid. Washing out a large amount of viscous blackAnd (4) silt. After injection, the daily oil pressure is 10MPa, the sleeve pressure is 9.5MPa, and the daily water injection amount is 48m3. Theoil pressure is 11.2MPa at the bottom of 12 months, the casing pressure is 11MPa, and the daily water injection quantity is 33m3Satisfy the injection allocation of 30m3The requirement of/d, and has been effective to date.
Claims (4)
1. A nitric acid powder acid liquid system and an acidification process for a water injection well are characterized in that: the nitric acid powder acid liquid system consists of well washing liquid, pre-solution, nitric acid powder liquid and hydrochloric acid liquid, wherein the pre-solution is formed by mixing CH961 low-damage liquid and clear water according to the weight ratio of 3: 1, and the nitric acid powder liquid is formed by compounding 20% of nitric acid powder, 2% of nitric acid corrosion inhibitor and 1% of iron ion stabilizer; the hydrochloric acid solution consists of 15% of hydrochloric acid, 0.5% of anti-swelling agent, 1% of corrosion inhibitor, 0.1% of active agent and 1% of iron ion stabilizer, and the well-flushing liquid is prepared from nonionic surfactant.
2. The water injection well nitric acid powder acid liquor system and acidizing process of claim 1 wherein: the method comprises connecting a ground cement truck and a wellhead acidized oil pipe column, injecting CH961 low-damage pad fluid from an oil pipe at a small discharge amount which is 1.5 times of the volume of the oil pipe from a wellhead to a treatment layer after conventional well flushing and water outlet cleaning, and then pressurizing to increase the discharge amount and inject nitric acid powder fluid at an amount of 1-3m per meter of oil layer3Then squeeze in spacer fluid, i.e. flushing fluid 2m3Pumping hydrochloric acid solution with the dosage of 2 times of the nitric acid powder solution, finally extruding a displacement solutionwith the volume of an oil pipe, namely a well-flushing solution, closing the well for reaction for 6-12 hours, and mixing air with the conventional well-flushing solution to form vaporized waterPumping into oil pipe to wash well.
3. The water injection well nitric acid powder acid liquor system and acidizing process of claim 2 wherein: the liquid displacement of the vaporized water is 0.58m in single injection3Permin, the discharge capacity of the cement truck is 0.2m during mixed injection3Min, 15m of discharge capacity of air compressor3/min。
4. The water injection well nitric acid powder acid liquor system and acidizing process of claim 2 wherein: for a sleeve broken well or a well needing an isolation layer, the lower part of an oil pipe is connected with a hydraulic differential pressure packer and a deflection nozzle; and directly connecting a crosshead to the lower part of the oil pipe of the single-layer injection well or the combined injection well at 0.5m below the perforation section for construction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01144897 CN1429963A (en) | 2001-12-30 | 2001-12-30 | Water injection well nitric acid powder-acid liquid system and acidification process |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 01144897 CN1429963A (en) | 2001-12-30 | 2001-12-30 | Water injection well nitric acid powder-acid liquid system and acidification process |
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| CN1429963A true CN1429963A (en) | 2003-07-16 |
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| CN 01144897 Pending CN1429963A (en) | 2001-12-30 | 2001-12-30 | Water injection well nitric acid powder-acid liquid system and acidification process |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100564792C (en) * | 2003-10-22 | 2009-12-02 | 贝克休斯公司 | The method of temporary barrier is provided in flow channel |
| CN101597488B (en) * | 2009-06-26 | 2012-03-07 | 中国石油天然气股份有限公司 | Treating fluid for high solid phase drilling fluid filter cake removal |
| CN102775980A (en) * | 2012-07-17 | 2012-11-14 | 大庆井升伟业油田技术服务有限公司 | Acidizing block remover suitable for complex lithologic reservoir |
| CN102041987B (en) * | 2009-10-13 | 2014-01-15 | 中国石油天然气股份有限公司 | Method for water control and oil production increasing acidification of oil well at water content increasing stage of low-pressure heterogeneous reservoir |
| CN104295275A (en) * | 2013-07-17 | 2015-01-21 | 中国石油化工股份有限公司 | Deep blockage removal and injection increase method for water injection well of medium-and-high-permeability sandstone reservoir |
| CN106281277A (en) * | 2016-07-22 | 2017-01-04 | 大庆东宽久久科技有限公司 | A kind of de-plugging scale removal increases adopts liquid |
| CN108252693A (en) * | 2017-12-27 | 2018-07-06 | 中国石油天然气股份有限公司 | A kind of water injection well choosing and selling method using nano material |
| CN108865093A (en) * | 2018-05-23 | 2018-11-23 | 克拉玛依市红都有限责任公司 | Uranium mine anatonosis blockages relieving fluid and its application method and application |
-
2001
- 2001-12-30 CN CN 01144897 patent/CN1429963A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100564792C (en) * | 2003-10-22 | 2009-12-02 | 贝克休斯公司 | The method of temporary barrier is provided in flow channel |
| CN101597488B (en) * | 2009-06-26 | 2012-03-07 | 中国石油天然气股份有限公司 | Treating fluid for high solid phase drilling fluid filter cake removal |
| CN102041987B (en) * | 2009-10-13 | 2014-01-15 | 中国石油天然气股份有限公司 | Method for water control and oil production increasing acidification of oil well at water content increasing stage of low-pressure heterogeneous reservoir |
| CN102775980A (en) * | 2012-07-17 | 2012-11-14 | 大庆井升伟业油田技术服务有限公司 | Acidizing block remover suitable for complex lithologic reservoir |
| CN104295275A (en) * | 2013-07-17 | 2015-01-21 | 中国石油化工股份有限公司 | Deep blockage removal and injection increase method for water injection well of medium-and-high-permeability sandstone reservoir |
| CN106281277A (en) * | 2016-07-22 | 2017-01-04 | 大庆东宽久久科技有限公司 | A kind of de-plugging scale removal increases adopts liquid |
| CN108252693A (en) * | 2017-12-27 | 2018-07-06 | 中国石油天然气股份有限公司 | A kind of water injection well choosing and selling method using nano material |
| CN108865093A (en) * | 2018-05-23 | 2018-11-23 | 克拉玛依市红都有限责任公司 | Uranium mine anatonosis blockages relieving fluid and its application method and application |
| CN108865093B (en) * | 2018-05-23 | 2021-04-06 | 克拉玛依市红都有限责任公司 | Infiltration-increasing blockage removing fluid for uranium mine and using method and application thereof |
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