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Oil well cleanup additive

A drainage aid and technology for oil wells, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve problems such as clogged formations, achieve the effects of reducing surface tension, accelerating flowback, and reducing interfacial tension

Active Publication Date: 2009-09-23
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Overcome the problem of acidification residue clogging the formation and causing secondary pollution of the formation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Embodiment 1: each component weight percent of oil well drainage aid is:

[0042] 1. Dodecyl dimethyl benzyl ammonium chloride (industrial product): 7.8%;

[0043] 2. Fatty alcohol polyoxyethylene ether, JFC-4 (industrial product): 3.4%;

[0044] 3. Polyoxyethylene alkyl alcohol ether-8 (JFC) (industrial product): 26%;

[0045] 4. Fatty alcohol polyoxyethylene ether, JFC-6 (industrial product): 4.8%;

[0046] 5. Fluorocarbon surfactant FN-3 (industrial product): 0.06%;

[0047] 6. Water: 57.94%.

[0048] Production method of oil well drainage aid:

[0049] First, add fatty alcohol polyoxyethylene ether (JFC-4), polyoxyethylene alkyl alcohol ether-8 (JFC) and fatty alcohol polyoxyethylene ether (JFC-6) into the enamel reaction kettle in proportion, and slowly heat up to 59°C; Secondly, under constant stirring, first add part of the water, part of the water is 5% of the weight of all the water that needs to be added, continue stirring for 30 minutes, and then add dod...

Embodiment 2

[0051] Embodiment 2: identical with the production method of embodiment 1, each component weight percent of oil well drainage aid is:

[0052] 1. Dodecyl dimethyl benzyl ammonium chloride (industrial product): 8.9%;

[0053] 2. Fatty alcohol polyoxyethylene ether, JFC-4 (industrial product): 3%;

[0054] 3. Polyoxyethylene alkyl alcohol ether-8 (JFC) (industrial product): 28%;

[0055] 4. Fatty alcohol polyoxyethylene ether, JFC-6 (industrial product): 4.5%;

[0056] 5. Fluorocarbon surfactant FN-3 (industrial product): 0.07%;

[0057] 6. Water: 55.53%.

[0058] Effect: 1.2% oil well drainage aid was added to the fracturing fluid of Well X-304. After the construction, the residual liquid flowback time was reduced from 48 hours to 37.4 hours for similar oil wells, and the flowback time was accelerated by 22.08 percentage points.

Embodiment 3

[0059] Embodiment 3: identical with the production method of embodiment 1, each component weight percent of oil well drainage aid is:

[0060] 1. Dodecyl dimethyl benzyl ammonium chloride (industrial product): 10.5%;

[0061] 2. Fatty alcohol polyoxyethylene ether, JFC-4 (industrial product): 2.8%;

[0062] 3. Polyoxyethylene alkyl alcohol ether-8 (JFC) (industrial product): 30%;

[0063] 4. Fatty alcohol polyoxyethylene ether, JFC-6 (industrial product): 4.2%;

[0064] 5. Fluorocarbon surfactant FN-3 (industrial product): 0.08%;

[0065] 6. Water: 52.42%.

[0066] Effect: 1.4% oil well drainage aid was added to the acidizing fluid of Well Y-391. After the construction was completed, the residual liquid flowback time was reduced from 48 hours to 34.9 hours for similar oil wells, and the flowback time was accelerated by 27.29 percentage points.

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PUM

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Abstract

The invention relates to an oil well cleanup additive which is applicable to residual liquid cleanup after fracture acidizing of an oil well in an oil field. The cleanup additive comprises the following ingredients according to weight percentage: 7.5-13.5% of dodecyldimethylbenzylammonium chloride, 2-3.5% of fatty alcohol-polyoxyethylene ether, 25-34% of polyoxyethylated alkyl alcohol-8, 3.5-5% of fatty alcohol-polyoxyethylene ether, 0.05-0.1% of fluorocarbon surfactant FN-3, and the allowance of water. A preparation method of the oil well cleanup additive comprises the steps as follows: fatty alcohol-polyoxyethylene ether, JFC-4, polyoxyethylated alkyl alcohol-8 and fatty alcohol-polyoxyethylene ether are added into an enamel reactor by proportion; the temperature is raised to 55-60 DEG C; 5% of water is firstly added while stirring; dodecyldimethylbenzylammonium chloride and fluorocarbon surfactant FN-3 are then added in proportion and stirred for 30 minutes; the water is then added and the mixture is cooled to normal temperature. The oil well cleanup additive reduces the adhesive force of residual construction liquid flowing in reservoir bed, thereby accelerating the flowback of residual liquid by 20-30 percentage points.

Description

technical field [0001] The invention belongs to the technical field of chemicals used in the petroleum industry, and in particular relates to a formula of an oil well drainage aid and a preparation method thereof. It is suitable for the drainage of residual liquid after acidizing and fracturing of oil wells in oil fields. Background technique [0002] Acidizing is to inject acid liquid into the formation to dissolve the mineral composition of the reservoir rock and the substances that cause clogging of the reservoir during drilling, well completion, workover and oil production operations, and to improve the permeability of the reservoir; fracturing is to use the surface high-pressure pump group, Pump high-viscosity fracturing fluid into the well to create fractures in the formation, add proppant to fill the fractures, and improve the conductivity of the formation. After oil well acidizing and fracturing, it is necessary to quickly discharge and clean the residual fluid in t...

Claims

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Application Information

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IPC IPC(8): C09K8/60
Inventor 付亚荣付丽霞李造吉李冬青吴泽美解宏伟蒲祥金蔡远红游靖杨中锋牛宝歧陈宝新孟威姚为有
Owner PETROCHINA CO LTD
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