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A micro-fracture micro-nano plugging material for drilling and its preparation method

A technology for plugging materials and micro-cracks, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., and can solve problems such as large size and damage

Active Publication Date: 2017-05-31
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the temporary blocking technology applied at home and abroad is based on the conventional temporary blocking theory D 50 Basically, the particle size of the temporary plugging material is relatively large and can only plug large pores and fractures, while smaller particles can still enter the reservoir and cause considerable damage

Method used

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  • A micro-fracture micro-nano plugging material for drilling and its preparation method
  • A micro-fracture micro-nano plugging material for drilling and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0018] (1) Weigh 80 parts of paraffin and 100 parts of white oil into a beaker and melt at 70°C; after melting completely, carry out slow magnetic stirring, and add 40 parts of composite surfactant during this process; after completely dissolving , slowly add 200 parts of tap water dropwise; stir for another 20 min, stop stirring after cooling down, and take samples to test the performance.

[0019] (2) Weigh 200 parts, 250 parts, and 300 parts of ultrafine calcium carbonate of 500 mesh, 1000 mesh, and 2500 mesh respectively, put the three into a closed stirring container, stir at high speed for 30 minutes, and wait for all the powders to settle completely.

[0020] (3) Add 100 parts of the prepared paraffin nanoemulsion to the mixer, and gradually mix 200 parts of the prepared composite ultrafine calcium carbonate into the nanoemulsion at the speed of the mixer at 3000r / min, and then mix it at 10000r / min Stir for 30 minutes at a high speed to fully mix the two to obtain the p...

example 2

[0022] (1) Weigh 100 parts of paraffin and 80 parts of white oil and add them to the stirrer, melt at 75°C; after the melting is complete, carry out slow magnetic stirring, and add 50 parts of composite surfactant during this process; wait for complete dissolution Finally, slowly add 250 parts of tap water dropwise; stir for another 25 min, stop stirring after cooling down, and take samples to test the performance.

[0023] (2) Weigh 250 parts, 200 parts, and 300 parts of ultrafine calcium carbonate of 500 mesh, 1000 mesh, and 2500 mesh respectively, put the three into a closed stirring container, stir at high speed for 30 minutes, and wait for all the powders to settle completely.

[0024] (3) Add 200 parts of the prepared paraffin nanoemulsion into the high mixing cup, and gradually mix 300 parts of the prepared composite ultrafine calcium carbonate into the nanoemulsion at the speed of the mixer at 3000r / min, and then mix it at 10000r / min Stir at a speed of 30 min for 30 mi...

example 3

[0026] (1) Weigh 120 parts of paraffin and 120 parts of white oil into a beaker and melt at 80°C; after melting completely, carry out slow magnetic stirring, and add 60 parts of composite surfactant during this process; after completely dissolving , slowly add 300 parts of tap water dropwise; stir for another 30 min, stop stirring after cooling down, and take samples to test the performance.

[0027] (2) Weigh 300 parts of 500-mesh, 1000-mesh, and 2500-mesh ultrafine calcium carbonate respectively, put the three into a closed stirring container, stir at high speed for 30 minutes, and wait for all the powders to settle completely.

[0028] (3) Add 150 parts of the prepared paraffin nanoemulsion to the high mixing cup, and gradually mix 400 parts of the prepared composite ultrafine calcium carbonate into the nanoemulsion at the speed of the mixer at 3000r / min, and then mix it at 10000r / min Stir at a speed of 30 min for 30 min to fully mix the two to obtain the product.

[0029]...

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Abstract

The invention discloses a microcrack micro-nano plugging material for drilling and a preparation method. The plugging material is prepared by compounding 100-200 parts of paraffin nanoemulsion and 200-400 parts of compound ultra-fine calcium carbonate. The preparation method comprises the following steps of firstly synthesizing nanoemulsion by virtue of a low-energy emulsification method, putting 100-200 parts of nanoemulsion into a high-speed stirring cup, respectively uniformly mixing a certain amount of 50-mesh, 1000-mesh and 2500-mesh ultra-fine calcium carbonate to form compound ultra-fine calcium carbonate, under the condition that a rotation speed of a stirrer is 3000r / min, gradually mixing 200-400 parts of compound ultra-fine calcium carbonate into the nanoemulsion and stirring for 30 minutes at a rotation speed of 10000r / min so that the nanoemulsion and ultra-fine calcium carbonate are uniformly mixed to obtain the product. The plugging material can resist the temperature of 150 DEG C, when the plugging material is in contact with the microcracks in reservoir, microparticles and nanoparticles are automatically matched with microcracks in the size, the microparticles firstly quickly form a plugging layer and the nanoparticles form an effective plugging film so that double-layer plugging layers can be quickly and efficiently formed and the harm caused by the tiny particles in drilling fluid entering the reservoir is avoided.

Description

technical field [0001] The invention designs a micro-fracture micro-nano plugging material for well drilling used in the drilling process of oil exploration wells and production wells and a preparation method. Background technique [0002] At present, the temporary blocking technology applied at home and abroad is based on the conventional temporary blocking theory D 50 Basically, the particle size of the temporary plugging material is relatively large and can only plug large pores and fractures, while smaller particles can still enter the reservoir and cause considerable damage. Aiming at the blankness of micro-fracture plugging, a micro-nano plugging material is developed, which effectively integrates micron-sized particles and nano-sized particles according to the scientific ratio. The size of the particles and the cracks are automatically matched. When encountering a slightly larger crack, the micro-particles first quickly form a sealing layer, and the nano-particles fo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/42
CPCC09K8/426
Inventor 张鹏蓝强李公让乔军郑成胜徐运波张虹武学芹
Owner CHINA PETROCHEMICAL CORP
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