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Preparation method of de-filtration plugging agent for water-base drilling fluids

A technology for water-based drilling fluid and filtration reduction, which is applied in drilling compositions, chemical instruments and methods, etc., and can solve problems such as large differences in the performance of plugging agents.

Active Publication Date: 2015-04-08
LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems existing in the above-mentioned prior art, the present invention provides a preparation method of a fluid loss plugging agent for water-based drilling fluid, which solves the problem of large differences in the performance of the plugging agent in the prior art

Method used

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  • Preparation method of de-filtration plugging agent for water-base drilling fluids
  • Preparation method of de-filtration plugging agent for water-base drilling fluids
  • Preparation method of de-filtration plugging agent for water-base drilling fluids

Examples

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Embodiment 1

[0024] 15Kg styrene after refining, 5Kg methyl acrylate and 5Kg butyl acrylate are transferred in the reactor of belt reflux condensation and shear emulsification device, then add the aqueous solution of allyl ether sulfonate (wherein Contains 5Kg allyl ether sulfonate and 110Kg deionized water), after bubbling nitrogen gas for deoxygenation, shear emulsification at a speed of 3000r / min for 15min under normal temperature conditions, and continuously bubbling high-purity nitrogen gas for deoxygenation conditions Next, start the agitator, control its stirring speed at 300r / min, and start the reflux condensation and heating device. When the inside of the reaction kettle reaches 75°C, add a deionized aqueous solution of ammonium persulfate (including 0.6Kg of ammonium persulfate and 30Kg of deionized water) dropwise into the kettle, and after passing nitrogen for 6 hours, the water-based drilling solution of the present invention is obtained. Fluid loss plugging agent I for liquid...

Embodiment 2

[0027] Transfer the refined 15Kg of divinylbenzene, 5Kg of ethyl acrylate, and 6Kg of propyl acrylate to a reaction kettle with reflux condensation and shear emulsification devices, and then add an aqueous solution of acrylamide alkylsulfonate to the reaction kettle (Contains 6.5Kg of acrylamide alkyl sulfonate and 130Kg of deionized water), after bubbling with nitrogen gas to remove oxygen, shear and emulsify at a speed of 5000r / min for 10min at room temperature, and continue bubbling with high-purity nitrogen gas Under the condition of deoxygenation, start the stirrer, control its stirring speed at 400r / min, start the reflux condensation and heating device. When the inside of the reaction kettle reaches 80°C, add a deionized aqueous solution of potassium persulfate (including 0.6Kg of potassium persulfate and 25Kg of deionized water) dropwise into the kettle. Fluid loss plugging agent II for liquid use, hereinafter referred to as fluid loss plugging agent II. The molecular ...

Embodiment 3

[0030] 15Kg divinylbenzene after refining and 12.5Kg butyl acrylate are transferred in the reactor of band reflux condensation and shear emulsification device, then add the aqueous solution of acrylamide alkyl sulfonate (which contains 6Kg Alkyl propyl succinate sulfonate and 120Kg deionized water), after nitrogen bubbling for deoxygenation, shear emulsification at a speed of 5000r / min for 15min at room temperature, and continuous bubbling of high-purity nitrogen for deoxygenation Under the condition, start the agitator, control its stirring speed at 500r / min, and start the reflux condensation heating device. When the inside of the reaction kettle reaches 85°C, add a deionized aqueous solution of potassium persulfate-potassium bisulfite (including 0.6Kg of potassium persulfate-potassium bisulfite and 20Kg of deionized water) dropwise into the kettle, and let the nitrogen flow to keep the reaction After 7 hours, the fluid loss plugging agent for water-based drilling fluid of th...

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Abstract

The invention relates to a preparation method of a de-filtration plugging agent for water-base drilling fluids. The de-filtration plugging agent is prepared by carrying out emulsion polymerization on styrene monomer, acrylate monomer and polymerizable emulsifier monomer as main raw materials by using deionized water as a solvent. The de-filtration plugging agent for water-base drilling fluids has favorable compounding performance in polysulfonate and polymer water-base drilling fluids and alkyl glycoside soil-phase-free water-base drilling fluids, and can effectively control the high-temperature high-pressure filtrate rate of the water-base drilling fluids within the addition range of 2-3%. By properly introducing the benzene-ring-containing crosslinked structure, the temperature resistance of the plugging agent can reach 130 DEG C.

Description

technical field [0001] The invention relates to a preparation method of a fluid loss plugging agent for water-based drilling fluid, and belongs to the technical field of oil field chemistry. Background technique [0002] During the drilling process of water-based drilling fluid, excessive high-temperature and high-pressure filtration loss may easily cause downhole complex situations such as well wall collapse, filter cake thickening, and even pressure differential sticking, which seriously affects the construction progress of the project. Generally, domestic mud monitoring standards stipulate that on-site drilling fluid loss under high temperature and high pressure is controlled within 15ml, but further control of high temperature and high pressure fluid loss of water-based drilling fluid will undoubtedly be more effective in maintaining wellbore stability and reducing the probability of downhole complex accidents. [0003] At present, most of the fluid loss plugging agents ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F212/08C08F212/36C08F220/14C08F220/18C08F220/58C08F2/26C09K8/035
Inventor 马诚李剑毛微
Owner LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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