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Ultralow permeability oil filed water injection well multicomponent chemical microemulsion pressure reduction and injection gain method

An oilfield water injection, multi-component technology, applied in chemical instruments and methods, bulk chemical production, earth-moving drilling, etc., can solve the problems of small acid penetration distance, short validity period, sedimentary blockage, etc., to improve liquid seepage environment, significant technical and economic benefits, and the effect of removing formation blockage

Active Publication Date: 2010-04-07
XIAN ZHONGFU KAIHONG GASOLINEEUM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Practice shows that when the traditional acidizing technology is applied in the low-permeability oilfield field, the acid-rock reaction speed is fast, the acid penetration distance is small, and the validity period after acidizing is short; or due to factors such as acid-rock reaction and acid liquid incompatibility, new Sedimentary clogging, resulting in low success rate, or even ineffective, or lead to a decline in the production of the corresponding oil well

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Example 1. The application in Changqing Anset Low Permeability Oilfield H14-14 oilfield sewage reinjection well, the oil layer permeability of this well is 13.63×10 -3 μm 2 .

[0013] During water injection well treatment, alkaline-CO 2 For microemulsion components, use 3% of inorganic alkali solution such as sodium hydroxide or sodium carbonate, 5% of complex blocking agent, 1% of stable chlorine dioxide solution, stabilizer IS-2: 1.5%, sulfonate Surfactants: 0.2%, Fluorocarbon Surfactants: 1.5%.

[0014] Micellar acid microemulsion components: 10% mixed acid solution of inorganic acid salts and organic acids, 5% phosphate ester microemulsion micelles, 0.5% imidazoline corrosion inhibitor, stabilizer IS-2: 2.5%.

[0015] The water quality injected into the well is poor, and the general measures are invalid or within the effective period. Before applying this technical measure, the water injection pressure is 10.5Mpa, and the geological distribution is 35m 3 / day, ...

Embodiment 2

[0016] Embodiment 2. The application in X41-031 well of Changqing Xifeng Oilfield, the oil layer permeability of this well is only 0.87×10 -3 μm 2 , belonging to ultra-low permeability reservoirs.

[0017] Alkaline-CO 2 For microemulsion components, use 15% of inorganic alkali solution such as sodium hydroxide or sodium carbonate, 0.5% of complex blocking agent, 7% of stable chlorine dioxide solution, 0.5% of stabilizer IS-2, sulfonate Surfactants: 2%, fluorocarbon surfactants: 0.1%.

[0018] Micellar acid microemulsion components: mixed acid solution of inorganic acid salts and organic acids 15%, phosphate ester microemulsion micelles 10%, imidazoline corrosion inhibitor 1.0%, stabilizer IS-2: 1.5%

[0019] Before the well measures, the water injection pressure was as high as 19.7Mpa, and the geological distribution was 45m 3 / day, actual water injection 1m 3 / day, the use of various injection techniques such as fracturing and acidification was ineffective; after the app...

Embodiment 3

[0020] Embodiment 3. Application in the G31-15 well of Changqing Oilfield, the oil layer permeability of this well is 8.26.×10 -3 μm 2

[0021] Alkaline-CO 2 Microemulsion components, 10% of inorganic alkali solution such as sodium hydroxide or sodium carbonate, 2.5% of complex, 5% of stable chlorine dioxide solution, stabilizer IS-2: 1.0%, sulfonate surface activity Agent: 2%, fluorocarbon surfactant: 1%.

[0022] Micellar acid microemulsion components: 25% of mixed acid solution of inorganic acid salts and organic acids, 15% of phosphate ester microemulsion micelles, 1.5% of imidazoline corrosion inhibitor, and 1.0% of stabilizer IS-2.

[0023] The water injection pressure of the well was 15.5Mpa higher before the measures, and the geological injection was 30m 3 / day, actual water injection 5m 3 / day, the initial water injection pressure once dropped to 0 after the implementation, and then rose to 6.2Mpa, and the water injection volume was 32m 3 / day, met the requireme...

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PUM

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Abstract

The invention relates to an ultra-low permeability oil filed water injection well chemical pressure reduction and injection gain technology. In the technology, micellar acid microemulsion and alkalis-CO2 microemulsion are combined together; the alkalis-CO2 microemulsion component refers to inorganic alkalis which comprises 3-15% of sodium hydroxide and sodium carbonate solutions, 0.5-5% of inorganic complex blocking remover, 0.5-1.5% of stabilizer IS-2, 0.2-2% of sulfonate surfactant and 0.1-1.5% of fluorocarbon surfactant; the micellar acid microemulsion component comprises 10-25% of mixed acid liquor composed of inorganic acid salt and organic acid, 5-15% of phosphate microemulsion micellar agent, 0.5-1.5% of imidazoline inhibitor and 1-2.5% of stabilizer IS-2. When using the technology, sectional plug continuous injection is adopted; the injection pressure is lower than the formation fracture pressure; and the injection speed: the delivery capacity is controlled to 150-300L / min. The microemulsion of the invention can generate new supercritical carbon dioxide (SC-CO2) microemulsion under the condition of floodable formation so as to effectively solve the reservoir choke of the ultra-low permeability oil filed water injection well, improve liquid phase seepage environment, realize pressure reduction and injection gain to the water injection well, increase the recovery rate of petroleum and obviously increase the economic benefit of oil extraction.

Description

technical field [0001] The invention relates to a technique for chemical depressurization and increased injection of water injection wells in ultra-low permeability oilfields. Background technique [0002] During the development process of oilfield water flooding, due to the incompatibility between the injected water and reservoir rock minerals and reservoir fluids, the presence of metabolites such as oil, suspended solids, and microorganisms in the water will cause serious damage to the formation of the water injection well, resulting in a rise in water injection pressure. If the water absorption index is high, the water absorption index will decrease, which will affect the oil displacement effect. [0003] At present, many chemical stimulation injection technologies are used in China, including soil acid, compound acid acidification, acidification-oxidation compound, thermochemical injection and other technical systems. Extra-low permeability oil fields (referring to perm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/20E21B43/25C09K8/84C09K8/58C09K8/52
CPCY02P20/54
Inventor 李泰余
Owner XIAN ZHONGFU KAIHONG GASOLINEEUM TECH
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