Oil-base imitating drilling fluid with characteristics of strong inhibition, strong blocking and high lubricity

A technology with strong inhibition and lubricity, applied in the field of drilling fluids, it can solve the problems of weak plugging ability of shale micro-fractures, and the lubricity cannot fully meet the construction requirements, and achieves low cost, strong plugging ability and good plugging ability. effect of ability

Inactive Publication Date: 2015-03-04
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to overcome the problems existing in the background art that the existing water-based drilling fluid containing amine compounds has weak plugging ability to mud shale micro-cracks, and the lubricity cannot fully meet the construction requirements, and provides a strong Oil-based drilling fluid with inhibition, strong plugging and high lubricity

Method used

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  • Oil-base imitating drilling fluid with characteristics of strong inhibition, strong blocking and high lubricity
  • Oil-base imitating drilling fluid with characteristics of strong inhibition, strong blocking and high lubricity
  • Oil-base imitating drilling fluid with characteristics of strong inhibition, strong blocking and high lubricity

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Measure 5 parts of 400mL water, start the stirrer, add 0.12g of pH regulator potassium hydroxide, and then add 16g of bentonite powder. After prehydration for 24 hours, add 8g of hydrolyzed polyacrylonitrile- Compound ammonium salt, 4g lignite resin, 8g oligomer shale inhibitor, 12g polyethylene glycol, 1.2g coating agent PAC-141, 8g sulfonated pitch, 8g compounded ultrafine calcium carbonate, 1.2g High-viscosity polyanionic cellulose, 12g compounded lubricant. Each treatment agent should be stirred at intervals and fully for 10 minutes before adding the treatment agent. After the treatment agent is added, stir at 3000rpm for 30 minutes.

[0025] Dry and crush the shale cuttings that are easy to hydrate and disperse, pass through a 100-mesh sieve, add the cuttings at 0%, 5%, 10%, 15%, and 20%, add the cuttings to the prepared drilling fluid, and measure The performance before and after aging at 150°C, the results are shown in Table 1.

[0026] Table 1 Drilling fluid p...

Embodiment 2

[0031] Prepare the imitation oil-based drilling fluid in the room according to the steps: Measure 400mL of water, turn on the mixer, add 0.12g of pH regulator potassium hydroxide, then add 16g of bentonite powder, pre-hydrate for 24 hours, and stir at low speed Add 8g of hydrolyzed polyacrylonitrile-compound ammonium salt, 4g of lignite resin, 8g of oligomer shale inhibitor, 12g of polyethylene glycol, 1.2g of coating agent PAC-141, 8g of sulfonated pitch, and 8g of compounded Ultrafine calcium carbonate, 1.2g high-viscosity polyanionic cellulose, and 12g compounded lubricant. Each treatment agent should be stirred at intervals and fully for 10 minutes before adding the treatment agent. After the treatment agent is added, stir at 3000rpm for 30 minutes.

[0032] Prepare one portion of oil-based drilling fluid according to the oil-based drilling fluid formula (the oil-water ratio is 80:20).

[0033] Select mud shale cuttings that are easily hydrated and dispersed, crush them i...

Embodiment 3

[0039]Prepare the imitation oil-based drilling fluid in the room according to the steps: Measure 400mL of water, turn on the mixer, add 0.12g of pH regulator potassium hydroxide, then add 16g of bentonite powder, pre-hydrate for 24 hours, and stir at low speed Add 8g of hydrolyzed polyacrylonitrile-compound ammonium salt, 4g of lignite resin, 8g of oligomer shale inhibitor, 12g of polyethylene glycol, 1.2g of coating agent PAC-141, 8g of sulfonated pitch, and 8g of compounded Ultrafine calcium carbonate, 1.2g flow regulator high-viscosity polyanionic cellulose, 12g compounded lubricant. Each treatment agent should be stirred at intervals and fully for 10 minutes before adding the treatment agent. After the treatment agent is added, stir at 3000rpm for 30 minutes.

[0040] Prepare one portion of oil-based drilling fluid according to the oil-based drilling fluid formula (the oil-water ratio is 80:20).

[0041] The lubricity and mud cake adhesion coefficient of the two drilling ...

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Abstract

The present invention relates to an oil-base imitating drilling fluid with characteristics of strong inhibition, strong blocking and high lubricity. In the prior art, the existing amine compound-containing water-base drilling fluid provides the weak blocking capability for the mud shale micro-crack, and the lubricity can not completely meet the construction requirement. With the oil-base imitating drilling fluid of the present invention, the problems in the prior art are mainly solved. The oil-base imitating drilling fluid comprises, by weight, 100 parts of water, 1-5 parts of bentonite, 1-3 parts of an ammonium salt filtrate reducer, 1-2 parts of a resin filtrate reducer, 1-2 parts of an oligomer shale inhibitor, 2-3 parts of an alcohol shale inhibitor, 0.2-0.4 part of a coating agent, 1-2 parts of an asphalt blocking agent, 1-2 parts of ultra-fine calcium carbonate, 0.1-0.5 part of a flow type adjusting agent, 0.01-0.04 part of a pH value adjusting agent, and 1-4 parts of a lubricant. According to the present invention, the oil-base imitating drilling fluid of the present invention is the water-base drilling fluid having the performance equivalent to the oil-base drilling fluid, the safe, rapid and efficient drilling construction in the mud shale stratum and the unconventional dense oil reservoir is ensured, and the new technical support is provided for the effective development of the oil and gas reservoir.

Description

technical field [0001] The invention relates to a drilling fluid in the field of petroleum drilling, in particular to an imitation oil-based drilling fluid with strong inhibition, strong plugging and high lubricity. Background technique [0002] Wellbore instability in shale formation is a technical problem often encountered in drilling engineering. Water-sensitive active mudstone and soft mudstone are very easy to hydrate and expand, resulting in downhole complications such as diameter shrinkage, collapse, bit balling and sticking. At the same time, the hydration and dispersion of active mudstone will also cause the clay content in the drilling fluid to increase. The increase of micron and submicron solid phase particles will lead to increased viscosity and shear of drilling fluid, deterioration of performance, and virtual mud cake on the wellbore wall. Hard and brittle shale will form relatively obvious bedding during the deposition process, and the fractures and micro-fr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/24
CPCC09K8/24C09K2208/28C09K2208/34
Inventor 侯杰刘永贵宋广顺宋涛郭栋张洋孙敏
Owner BC P INC CHINA NAT PETROLEUM CORP
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