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Drilling fluid, preparation method and application

A drilling fluid and oil drilling technology, applied in chemical instruments and methods, drilling compositions, organic chemistry, etc., can solve the problems of easy instability of shale wellbore, maintain wellbore stability and prevent surface hydration , the effect of reducing the expansion pressure

Active Publication Date: 2019-01-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to solve the problem that the mud shale well wall is easily unstable during the drilling process in the prior art, the present invention provides a drilling fluid, a preparation method and an application

Method used

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  • Drilling fluid, preparation method and application
  • Drilling fluid, preparation method and application
  • Drilling fluid, preparation method and application

Examples

Experimental program
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Effect test

preparation example Construction

[0044] Preparation of 1-aminoethyl-3-methylimidazolium bromide:

[0045] The four-necked flask equipped with stirrer, nitrogen conduit, thermometer and condenser is placed in a constant temperature water bath, and 1-methylimidazole (8.20g, 0.10mol), 2-bromoethylamine hydrobromide ( 20.50 g, 0.10 mol) and 50 mL of acetonitrile, after stirring at 80 ° C for 4 h, the solution appeared to be separated, NaOH (4.0 g, 0.10 mol) was added to the mixture for neutralization, the NaBr precipitate was removed by filtration, and the upper layer solution containing the remaining reactant was poured out to remove , the lower layer solution was extracted with acetonitrile (5mL×3) to obtain 15.5g of a waxy product, which was the shale inhibitor 1-aminoethyl-3-methylimidazolium bromide salt of the present invention.

Embodiment 1

[0047] The 1-aminoethyl-3-methylimidazolium bromide salt prepared in the preparation example was dissolved in tap water to prepare an aqueous solution with a concentration of 1% by weight. Five parts of 300 mL of 1% by weight 1-aminoethyl-3-methylimidazolium bromide aqueous solution were respectively selected for the determination of inhibitory effect evaluation.

Embodiment 2

[0061] Configure water-based drilling fluid according to the following formula: 100 parts by weight of water, 3 parts by weight of sodium bentonite, 0.2 parts by weight of potassium hydroxide, 0.3 parts by weight of Welan gum, 3 parts by weight of sulfonated bitumen, 4 parts by weight The sulfonated phenolic resin, the sulfonated lignite resin of 2 parts by weight, the pentaerythritol oleate of 2 parts by weight, the calcium carbonate of 3 parts by weight, the barite (barium sulfate content is 93% by weight) of 10 parts by weight, and respectively Add 1 part by weight of the shale inhibitor of the preparation example to obtain drilling fluid A1.

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Abstract

The invention discloses a drilling fluid, a preparation method and an application. The drilling fluid is prepared from the following components in parts by weight: 100 parts of water and 0.5-5 parts of a shale inhibitor, wherein the shale inhibitor is 1-aminoethyl-3-methylimidazolium salt with structural formula shown in the description, R is R is Br, NO3, PF6 or BF4. The drilling fluid contains the shale inhibitor capable of effectively inhibiting shale hydration dispersion, and can effectively prevent surface hydration of montmorillonite in shale when being used for drilling large sections of shale formations prone to wellbore instability, so that shale swelling pressure is reduced, and wellbore stability is maintained.

Description

technical field [0001] The present invention relates to the field of drilling, and more specifically relates to a drilling fluid, a preparation method and an application. Background technique [0002] In the process of oil and gas drilling, the worldwide problem of wellbore instability in shale formations has been perplexing the vast number of petroleum engineering technicians. Well collapse and borehole shrinkage caused by well wall instability will not only lead to downhole complications such as tripping resistance, drill sticking, increased torque, pump holding, etc. Well scrapping. [0003] 90% of wellbore instability accidents during drilling occur in shale formations. Mud shale contains water-sensitive clay minerals such as montmorillonite. When in contact with drilling fluid, free water in the drilling fluid invades the pores and micro-cracks of shale, causing the clay to hydrate and expand, and the resulting expansion pressure will make the mud sheet The strength ...

Claims

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Application Information

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IPC IPC(8): C09K8/22C07D233/61
CPCC07D233/61C09K8/22C09K2208/12
Inventor 林永学宣扬钱晓琳王海波张凤英杨小华
Owner CHINA PETROLEUM & CHEM CORP
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