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Oil-based microemulsion plugging agent for well drilling fluid and preparation method of plugging agent

A drilling fluid and plugging agent technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of blindness of plugging, contamination of reservoir sections, unfavorable plugging performance of oil-based drilling fluids, etc. Improve the plugging efficiency, easy to promote the effect

Active Publication Date: 2017-12-12
CHINA PETROCHEMICAL CORP +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the inventors further studied the above three methods and found that there are still many defects in the prior art: (1) Most of the plugging agents used are single nano-rigid particles for plugging, and less deformable particles are involved, such as microemulsions and other liquid droplets Plugging; (2) Asphalt, colloid and other materials are used for plugging in oil-based drilling fluids. The plugging of these materials is blind and causes serious pollution in the reservoir section; (3) Most of them are single preparations , and the particle size is large, unable to block the ultra-fine pore throat
If these problems are not properly resolved, it will not be conducive to further improving the plugging performance of oil-based drilling fluid.

Method used

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  • Oil-based microemulsion plugging agent for well drilling fluid and preparation method of plugging agent

Examples

Experimental program
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Effect test

Embodiment 1

[0020] First, pour 25g of water into the reaction vessel, heat up to 25°C, add 7g of isotridecanyl polyoxyethylene ether RO-(CH 2 CH 2 O)5-H; R=iso-C1 3 h 27 Add it into the reaction vessel, and then stir evenly at a speed of 2500r / min. After stirring evenly, slowly add 65g of 15# white oil dropwise, and stir at a speed of 3000r / min until the mixed liquid becomes a transparent and uniform liquid. During this process In the process, the temperature needs to be maintained at 25°C, and it is allowed to stand for 10 hours. Then add 3g of nano-calcium carbonate (particle size 80~100nm) into the above reaction vessel and stir evenly at a speed of 2500r / min. .

Embodiment 2

[0022] First, pour 30g of water into the reaction vessel, heat to 25°C, add 5g of isotridecanyl polyoxyethylene ether RO-(CH 2 CH 2 O) 7 -H; R=iso-C 13 h 27 Add it into the reaction vessel, and stir at a speed of 2500r / min. After stirring evenly, slowly add 30g of 7# white oil and 30g of 15# white oil dropwise at the same time, and stir at a speed of 3000r / min until the mixture becomes transparent Homogeneous liquid, during this process, the temperature needs to be maintained at 25°C, and it is allowed to stand for 10 hours. Then add 2g nano calcium carbonate (particle size 80~100nm), 3g nano silicon dioxide SP 50 (Particle size 50nm±5nm) Stir evenly at a speed of 2500r / min, when it presents a uniform translucent state, discharge the oil-based microemulsion plugging agent for drilling fluid.

Embodiment 3

[0024] First, pour 40g of water into the reaction vessel, heat to 30°C, add 3g of isotridecanyl polyoxyethylene ether RO-(CH 2 CH 2O ) 5 -H; R=iso-C 13 h 27 Add it into the reaction vessel, and then stir evenly at a speed of 2500r / min. After stirring evenly, slowly add 60g of silicone oil dropwise, and stir at a speed of 3000r / min until the mixed liquid becomes a transparent and uniform liquid. During this process, the temperature Need to maintain 30 ℃, let it stand for 8h. Then add 2g nano calcium carbonate (particle size 80~100nm), 2g nano silicon dioxide SP 50 (Particle size 50nm±5nm), 3g nanometer aluminum oxide γ-Al 2 o 3 (Particle size 20nm±2nm). Stir evenly at a speed of 2500r / min, and when it is uniform and translucent, discharge the oil-based microemulsion plugging agent for drilling fluid.

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Abstract

The invention relates to the technical field of oil-based microemulsion plugging agents for well drilling fluids, and especially relates to an oil-based microemulsion plugging agent for a well drilling fluid and a preparation method of the plugging agent. According to the preparation method, the oil-based microemulsion plugging agent for the well drilling fluid is prepared from a composite technology of an oil-based microemulsion fluid and nano rigid particles, and therefore technical effects of the oil-based well drilling fluid that pores are blocked in real time and a stratum is effectively stabilized in a shale stratum well drilling process are achieved. The oil-based microemulsion plugging agent for the well drilling fluid is composed of water, a surfactant, mineral oil and the nano rigid particles, wherein the weight content of the water is 10%-50%, the weight content of the surfactant is 3%-10%, the weight content of the nano rigid particles is 3%-5%, and the balance of the mineral oil.

Description

technical field [0001] The invention relates to the technical field of oil-based microemulsion plugging agent for drilling fluid, in particular to an oil-based microemulsion plugging agent for drilling fluid and a preparation method thereof. Background technique [0002] Oil-based drilling fluid has the advantages of strong inhibition, resistance to high temperature, high salt, and calcium intrusion. It has obvious advantages in wellbore stability, lubrication and anti-sticking, and inhibition of shale hydration expansion. With the development of current oil and gas field exploitation, shale oil and gas reservoirs occupy a relatively important part, and in the exploitation of shale oil and gas reservoirs, the wellbore stability of the shale formation is the key to the success or failure of the drilling process. The mud shale is easily hydrated, swelled and dispersed when it meets water, causing the well wall to collapse. Therefore, the plugging performance of the oil-based...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/03C09K8/36C09K8/32
CPCC09K8/03C09K8/32C09K8/36C09K2208/10
Inventor 陈健蓝强于雷夏晔张敬辉李公让张鹏郑成胜徐运波张妍
Owner CHINA PETROCHEMICAL CORP
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