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A kind of water base completion fluid and its preparation and application

A completion fluid, water-based technology, used in wellbore/well components, chemical instruments and methods, sealing/packaging, etc. Development and other issues, to achieve the effect of high viscosity reduction rate

Active Publication Date: 2022-03-04
CHINA OILFIELD SERVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high porosity and high permeability characteristics of the reservoir, the completion fluid often leaks seriously. If the completion fluid is not compatible with the reservoir fluid, especially the heavy oil, the fluidity of the heavy oil will deteriorate, which will affect the development of heavy oil reservoirs and inhibit the development of heavy oil reservoirs. Reservoir productivity release

Method used

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  • A kind of water base completion fluid and its preparation and application
  • A kind of water base completion fluid and its preparation and application
  • A kind of water base completion fluid and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The inorganic salt of 90 mass parts and organic salt (sodium chloride, potassium chloride, calcium chloride, calcium bromide, sodium formate, cesium formate and potassium formate, mass ratio is 6:1:5:1:2:11: 19) Add 55 parts by mass of simulated seawater (the salinity is 34.61g / L). At this time, the salinity of the water is 3468g / L. Stir until it is completely dissolved. Add 0.5 parts by mass of compound I (R1 in compound I is phenyl, n is 50 to 70), 0.1 parts by mass of cationic surfactant (that is, a total of 0.6 parts of anti-reverse emulsifier); stir well and add 1.5 parts by mass Compound II (R2 and R3 in compound II are n-butyl, n is 65 to 85), 0.5 parts by mass of 20 to 30 ionicity cationic polyacrylamide (that is, a total of 2 parts of clay inhibitor), stir well and add 0.5 parts by mass of corrosion inhibitor, fully stirred and circulated, the stirring time ≥ 50 minutes, and the temperature ≥ 5°C, to obtain a water-based completion fluid for heavy oil reservoir...

Embodiment 2 to 6

[0072] The preparation method is the same as that of Example 1, and the difference between Examples 2 to 6 and Example 1 is that the amount of each material is different, as shown in Table 5 below (parts by mass). The ratio of each component in the anti-reverse emulsifier and clay inhibitor is the same as that in Example 1.

[0073] table 5:

[0074]

[0075] The performance evaluations of Examples 2 to 6 are the same as in Example 1, and the performance evaluation results are shown in Table 6.

[0076] Table 6:

[0077]

[0078] The test temperature of the viscosity reduction rate is 220° C., and when the temperature is lower than 220° C., the viscosity reduction rate of the water-based completion fluids provided in Examples 2 to 6 will be better.

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Abstract

The application discloses a water-based completion fluid and its preparation and application. The water-based completion fluid of this application can be used in heavy oil reservoirs. It combines the heavy oil viscosity reduction technology with the completion fluid system. Well fluid system. It has a high viscosity reduction rate for heavy oil, strong inhibition for clay particles, low metal corrosion rate, good compatibility with reservoir fluids, and excellent reservoir protection effect; in addition, the preparation method of the completion fluid is simple and completely Satisfy the on-site use and configuration.

Description

technical field [0001] The application belongs to the technical field of drilling and completion fluids for petroleum development, and relates to, but not limited to, a water-based well completion fluid with strong inhibition, no solid phase, and prevention of oil-water emulsification and viscosity increase. Background technique [0002] According to preliminary statistics, more than 90% of unconsolidated sandstone reservoirs are accompanied by heavy oil reserves. Unconsolidated sandstone reservoirs have shallow burial, poor diagenesis, loose cementation, and generally high shale mass fraction in reservoirs, which belong to high porosity and high permeability reservoirs. Due to the high porosity and high permeability characteristics of the reservoir, the completion fluid often leaks seriously. If the completion fluid is not compatible with the reservoir fluid, especially the heavy oil, the fluidity of the heavy oil will deteriorate, which will affect the development of heavy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/588C09K8/88E21B33/13
CPCC09K8/588C09K8/885E21B33/13C09K2208/12C09K2208/32C09K2208/28
Inventor 陈缘博徐安国王超群刁琪王志永张道明张鹏耿铁苗海龙罗健生
Owner CHINA OILFIELD SERVICES
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