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Double-chamber microcapsule for drilling fluid as well as preparation method and application of double-chamber microcapsule

A technology of microcapsules and drilling fluids, applied in the field of drilling fluids, can solve the problems of mud cake removal difficulty, cementing strength decrease, aggravation difficulty and cost, etc., and achieve simple and controllable reversal method, good suspension stability, and no aggravation The effect of material settling

Pending Publication Date: 2022-07-26
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, conventional oil-based drilling fluids will cause a series of follow-up problems, such as: changes in the wettability of formations and cuttings, difficulty in removing mud cakes, decreased cementing bond strength, clogging of formations by emulsions, difficulty in handling oily cuttings, and high processing costs. higher
As a result, there are contradictions between the drilling efficiency of oil-based drilling fluids, the productivity of oil and gas wells, and environmental protection, which not only hinders the popularization and application of oil-based drilling fluids, but also seriously affects the benefits of exploration and development of oil and gas resources.
At present, in the actual application cases of drilling fluids we have investigated abroad, the reversible emulsified drilling fluid system has insufficient temperature resistance and low density, which cannot meet the technical requirements of high temperature and high pressure deep well and ultra-deep well oil and gas drilling operations
However, the domestic reversible emulsified drilling fluid is still in its infancy, and there is still a big gap with foreign research results.
The reversible emulsification drilling system currently used in China uses strong acid / alkali as the stimulating condition, which has a series of problems such as corrosion of pipeline strings, storage and transportation, and operation safety, which increases the difficulty and cost of construction and further reduces the cost of the system. Site Utilization

Method used

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  • Double-chamber microcapsule for drilling fluid as well as preparation method and application of double-chamber microcapsule
  • Double-chamber microcapsule for drilling fluid as well as preparation method and application of double-chamber microcapsule
  • Double-chamber microcapsule for drilling fluid as well as preparation method and application of double-chamber microcapsule

Examples

Experimental program
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Effect test

Embodiment 1

[0063] The present embodiment provides a method for preparing dual-chamber microcapsules for drilling fluid, comprising the following steps:

[0064] 1. Add 50 parts of paraffin wax 70#, 20 parts of ethyl cellulose, and 3 parts of silicone epoxy resin to 200 parts of cyclohexane and heat up to 70 °C, and add 20 parts of solid hydrochloric acid / solid potassium hydroxide with a particle size of 50 nm to 1 μm. Add into the solution, ultrasonically disperse for 30 min, rapidly cool down to 10-20 °C, filter the above layered solution, rinse three times with cyclohexane, vacuum dry at 20 °C for 10 h, grind and pulverize to obtain a pre-coated solid acid or a pre-coated solid acid. covered with solid base.

[0065] 2. Disperse 10 parts of PNIPAM particles in 100 parts of deionized water to obtain a dispersion, add 10 parts of pre-coated solid acid dropwise, continue to ultrasonically disperse for 30 minutes, and finally, dialyze with deionized water for 3 times, filter and separate b...

Embodiment 2

[0084] The present embodiment provides a method for preparing dual-chamber microcapsules for drilling fluid, comprising the following steps:

[0085] 1. Add 40 parts of EVA wax 85# and 10 parts of polystyrene into 100 parts of toluene and heat up to 100°C, add 30 parts of solid nitric acid / solid sodium hydroxide with a particle size of 50nm to 1 μm into the solution, ultrasonically disperse for 50min, and rapidly cool down To 30°C, the above layered solution was filtered, washed three times with toluene, vacuum dried at 30°C for 10 h, ground and pulverized to obtain a pre-coated solid acid or a pre-coated solid base.

[0086] 2. Disperse 30 parts of poly(2-carboxy-N-isopropylamide) in 100 parts of deionized water to obtain a dispersion liquid, add 20 parts of pre-coated solid acid dropwise, continue ultrasonic dispersion for 30min, and finally, use deionized water Dialyzed for 3 times, separated by molecular sieve filtration for 4 hours, and freeze-dried to obtain temperature-...

Embodiment 3

[0098] The present embodiment provides a method for preparing dual-chamber microcapsules for drilling fluid, comprising the following steps:

[0099] 1. Add 50 parts of paraffin wax 80# and 10 parts of melamine formaldehyde resin to 100 parts of melamine formaldehyde resin in cyclohexane and heat up to 80°C. Add 10 parts of solid phosphoric acid / solid potassium hydroxide with a particle size of 50 nm to 1 μm into the solution, and ultrasonically disperse for 1 hour. Cool to 10°C, filter the above layered solution, rinse with cyclohexane three times, vacuum dry for 10 hours, grind and pulverize to obtain a pre-coated solid acid or a pre-coated solid base. The solid acid / base is pre-coated as solid acid or solid base, and the above steps are repeated twice.

[0100] 2. Disperse 10 parts of PNIPAM particles and 10 parts of poly(2-carboxy-N-isopropylamide) in 100 parts of deionized water to obtain a dispersion, add 20 parts of pre-coated solid acid dropwise, continue to ultrasonic...

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Abstract

The invention provides a double-chamber microcapsule for drilling fluid as well as a preparation method and application of the double-chamber microcapsule. The double-chamber microcapsule is prepared by the following steps: firstly, preparing coated solid acid or pre-coated solid alkali, and then preparing temperature-sensitive polymer nanoparticles and a prepolymer mixed solution; and finally, adding the thermo-sensitive polymer nanoparticles encapsulated with the solid acid or the solid alkali into the prepolymer mixed solution encapsulated with the solid alkali or the solid alkali, carrying out ultrasonic emulsification to form Pickering emulsion, and carrying out heating reaction and treatment to obtain the double-chamber microcapsule. The double-chamber microcapsule is preset in the drilling fluid, participates in the formation of a filter cake, and can also be reversed into an oil-in-water drilling fluid or a water-in-oil drilling fluid by utilizing acid / alkali response. The reversing method is simple and controllable, and the reversing of the drilling fluid is delayed within a certain time. The density of the drilling fluid can be directly adjusted within 1.0 g / cm < 3 >-2.2 g / cm < 3 >, and the drilling fluid has good rheology, low filtration loss and good suspension stability within the range of 100-180 DEG C and is free of weighting material sedimentation and demulsification phenomena.

Description

technical field [0001] The invention belongs to the technical field of drilling fluid, and in particular relates to a dual-chamber microcapsule for drilling fluid and a preparation method and application thereof. Background technique [0002] Conventional water-in-oil drilling fluids usually have high emulsification stability and strong oil wetting properties, which will produce strong oil wettability to cuttings, drill strings and formations in contact with continuous oil, avoiding the use of water-based drilling fluids. A series of drilling problems caused by instability of water-sensitive shale. However, conventional oil-based drilling fluids will cause a series of follow-up problems, such as: resulting in changes in the wettability of formations and cuttings, difficulty in removing mud cakes, decline in cementing strength, blocking formations with emulsions, difficulty in handling oil-bearing cuttings, and processing costs. higher. As a result, the contradiction betwee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C09K8/36
CPCC09K8/36C09K8/035B01J13/04B01J13/206C09K8/26
Inventor 刘鹭蒲晓林
Owner SOUTHWEST PETROLEUM UNIV
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