High-density low-frictional-resistance drilling fluid

A low-friction, drilling fluid technology, applied in the field of oilfield drilling fluid, can solve the problems of difficult to meet drilling needs, high friction, high solid content, etc., to achieve low barite content, high inhibition performance, good rheological properties and filter loss effect

Active Publication Date: 2015-01-28
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing high-density drilling fluid has high solid phase content and high friction resistance, and it is difficult to meet the drilling needs under the condition of high formation pressure, and to provide a high-density and low-friction drilling fluid

Method used

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Examples

Experimental program
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Effect test

preparation example B1

[0021] 26.0 grams of 2-methyl-2-acryloyloxypropylsulfonic acid, 39.0 grams of acrylamide, 20.0 grams of acrylic acid and 2.6 grams of 2-hydroxy-3-methacryloyloxypropyltrimethylammonium chloride were placed at room temperature Prepare an aqueous solution, adjust the pH value of the aqueous solution to 9.0 with sodium hydroxide, then add 0.05 grams of ammonium persulfate and 0.05 grams of sodium bisulfite to initiate polymerization, the initial temperature of the polymerization reaction is 20 ° C, and the polymerization time is 5 minutes. The product is granulated, dried and pulverized to obtain fluid loss reducer B1, whose structural formula is:

[0022]

preparation example B2

[0024] Mix 56.0 grams of 2-methyl-2-acryloyloxypropylsulfonic acid, 28.0 grams of acrylamide, 10.0 grams of acrylic acid and 2.8 grams of 2-hydroxy-3-methacryloyloxypropyltrimethylammonium chloride at room temperature Prepare an aqueous solution, adjust the pH value of the aqueous solution to 11.0 with sodium hydroxide, then add 0.2 grams of potassium persulfate and 0.2 grams of sodium thiosulfate to initiate polymerization, the initial temperature of the polymerization reaction is 50 ° C, and the polymerization time is 20 minutes. The product is granulated, dried and pulverized to obtain fluid loss reducer B2, whose structural formula is:

[0025]

[0026] Two, the embodiment

Embodiment 1

[0028] Take 270 grams of clear water, add 8.1 grams of sodium bentonite and 0.405 grams of sodium carbonate under high-speed stirring conditions, stir for 20 minutes, and seal and maintain at room temperature for 24 hours to obtain a base slurry. Take the above base slurry and add 1.35 grams of sodium hydroxide, 0.27 grams of xanthan gum, 10.675 grams of B10.675 grams, 2.7 grams of carboxymethyl cellulose sodium salt, 8.1 grams of sulfonated phenolic resin, 8.1 grams of sulfonated lignite, and 5.4 grams of polymer alcohol, (C1:C2=1:1) 270 grams, 167 grams of barite, stirred for 20 minutes, put into the aging tank at 135°C / 16 hours, and the density was 1.60g / cm 3 high-density low-friction drilling fluid.

[0029] Embodiment 2~4 steps are identical with embodiment 1, and clear water is 270 grams, and treatment agent kind and consumption are as shown in table 1.

[0030] Table 1 embodiment 2~4 treatment agent consumption

[0031]

[0032] Note: NaOH is sodium hydroxide, LV-C...

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Abstract

The invention relates to a high-density low-frictional-resistance drilling fluid, and belongs to the technical field of oil-field drilling fluids. The high-density low-frictional-resistance drilling fluid employs water as a base liquid, and is obtained by mixing 1%-3% by mass of sodium bentonite, sodium carbonate accounting for 5% by mass of sodium bentonite, 0.5%-1.0% by mass of sodium hydroxide, 0.05%-0.1% by mass of tackifier A, 0.2%-0.5% by mass of filtrate reducer B, 0.5%-1.0% by mass of carboxymethyl cellulose sodium salt, 3.0%-5.0% by mass of sulfonated phenolic resin, 3.0%-5.0% by mass of sulfonated lignite, 2.0%-3.0% by mass of polymeric alcohol, 100% by mass of an organic salt C and 29.1%-122.2% by mass of barite, and performing high-temperature ageing. The drilling fluid has the temperature resistance up to 135 DEG C and the controllable density scope of 1.50-1.80 g / cm<3>, has good rheological property and filtration property at a high temperature, and has relatively low barite content, mud cake sticking coefficient and cyclic pressure dissipation, and relatively high inhibition performance.

Description

technical field [0001] The invention relates to a high-density and low-friction drilling fluid, which belongs to the technical field of oilfield drilling fluid. Background technique [0002] In recent years, with the deepening of oil and gas exploration and development, there are more and more deep wells and ultra-deep wells. Due to the more layers of the wellbore structure, the size of the lower wellbore is smaller; A large number of deep accident wells and low-yield wells need to use casing window sidetracking to resume production. Under the condition of high formation pressure, high-density drilling fluid is used for drilling. Since the commonly used drilling fluid in the prior art mainly uses barite, hematite, etc. High circulating equivalent density will be generated in the air. In the case of small annular space, it is easy to cause high pump pressure, small displacement, low annular space return speed during drilling operations, difficulty in carrying sand, poor hole...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/18C08F220/38C08F220/56C08F220/06C08F220/36
CPCC08F220/56C09K8/24C09K2208/28C08F220/06C08F220/585C08F220/34
Inventor 马文英钟灵舒尚文卢国林杨国涛谢慧华
Owner CHINA PETROCHEMICAL CORP
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