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Silicate-aluminate anti-sloughing drilling fluid

A silicate and aluminate technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problem of ignoring the plugging and sealing ability of drilling fluid, focusing on the inhibition of drilling fluid, and the difficulty of drilling fluid flow pattern Control and other issues, to improve the ability to suppress and prevent collapse, improve the stability of the well wall, and achieve the effect of well wall stability

Inactive Publication Date: 2017-01-11
SINOPEC SSC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The drilling fluids disclosed in the above-mentioned patents and literatures are mainly high-modulus conventional silicate drilling fluids, or anti-slump-inhibiting drilling fluids mainly composed of ammonium salt-based organic inhibitors and anti-slump agents or organically synthesized silicon-aluminum inhibitors. , their problems are mainly that the flow pattern of drilling fluid is difficult to control or they focus on the suppression of drilling fluid, while ignoring the plugging and sealing ability of drilling fluid

Method used

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  • Silicate-aluminate anti-sloughing drilling fluid
  • Silicate-aluminate anti-sloughing drilling fluid
  • Silicate-aluminate anti-sloughing drilling fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031]In this example, the silicate-aluminate anti-slump drilling fluid contains a concentration of 12900 mg / L silicate and 4400 mg / L aluminosilicate, and is prepared by the following steps: 350 mL of sodium bentonite base slurry with a mass fraction of 1% , with 8000 rpm high-speed stirring (stirring at the same speed below), add 0.35g high-viscosity sodium carboxymethylcellulose, 0.70g xanthan gum, 1.75g ​​low-viscosity sodium carboxymethylcellulose and 3.5g Low-viscosity sodium acrylate, 7g methyl glucoside, 1.75g ​​cationic ethyl glucoside, after stirring at high speed for 20 minutes, add 3.5g sulfonated lignite, 3.5g calcium carbonate with a particle size range of 2.5-10 microns and 3.5g Cationic asphalt, after stirring at high speed for 10 minutes, add 17.5g of potassium chloride and 1.75g ​​of sodium hydroxide, after stirring at high speed for 20 minutes, put it into an aging tank for aging at 120°C / 16h, then add 10.5g of sodium silicate and 1.05g of sodium metaaluminat...

Embodiment 2

[0033] In this example, the silicate-aluminate anti-slump drilling fluid contains a concentration of 21600 mg / L silicate and 6200 mg / L aluminosilicate, and is prepared by the following steps: 350 mL of sodium bentonite base slurry with a mass fraction of 2% , under the condition of high-speed stirring at 8000 rev / min (stirring at the same speed below), add 1.05g xanthan gum, 3.5g low viscosity sodium carboxymethyl cellulose, 17.5g methyl glucoside, 7g cationic ethyl glucoside After stirring at high speed for 20 minutes, add 7g sulfonated lignite, 7g sulfonated phenolic resin-I, 10.5g potassium humate, 7g sulfonated pitch, 24.5g potassium chloride and 1.75g ​​sodium hydroxide, after stirring at high speed for 10 minutes , then add 80g of barite and stir at high speed for 20 minutes, put it into the aging tank for 120℃ / 16h high temperature aging, then add 17.5g of sodium silicate and 1.75g ​​of sodium metaaluminate, stir at high speed for 10 minutes, put it into the aging tank A...

Embodiment 3

[0035] In this example, the silicate-aluminate anti-slump drilling fluid contains a concentration of 21600mg / L silicate and 6200mg / L aluminosilicate, and is prepared by the following steps: 350mL of sodium bentonite base slurry with a mass fraction of 1.5% , under the condition of high-speed stirring at 8000 rev / min (stirring at the same speed below), add 0.6g potassium polyacrylate, 1.75g ​​low-viscosity carboxymethyl cellulose sodium, 1.75g ​​low-viscosity carboxymethyl starch, 6g ethyl glucose Glycoside, 3.5g cationic methyl glucoside, after stirring at high speed for 20min, add 10.5g sulfonated lignite, 10.5g sulfonated phenolic resin-I, 7.0g Phoebe powder, 7.0g emulsified asphalt, 35g sodium chloride and 3.5g hydrogen After stirring sodium oxide at high speed for 10 minutes, add 138g of barite and stir at high speed for 20 minutes, put it into an aging tank for 120°C / 16h high temperature aging, then add 17.5g of sodium silicate and 1.75g ​​of sodium metaaluminate, and stir...

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Abstract

The present invention relates to the technical field of chemical oil field drilling fluids, and in particular discloses a silicate-aluminate system anti-sloughing drilling fluid, the drilling fluid is prepared from raw bentonite base slurry, a viscosity and shear strength improving agent, a filtrate loss reducer A, a high temperature filtrate loss reducer B, a flow type regulator, an organic inhibitor, an inorganic salt, a plugging agent, sodium hydroxide, barite, a silicate and sodium metaaluminate, by compounding of the low modulus silicate and the aluminate, in the conversion process of filtrate from high pH value environment to neutral environment, the low modulus silicate and the aluminate generate a silicate gel and a new material aluminosilicate precipitate to play chemical wall fixing and physical formation plugging roles, namely an inorganic mineral dense blocking layer is formed immediate vicinity of a wellbore, the collapse pressure of an easy-to-slump formation can be significantly reduced, the bearing capacity is effectively improved, anti-sloughing inhibition capacity of the drilling fluid can be improved, and the silicate-aluminate system anti-sloughing drilling fluid can better satisfy the requirements of borehole wall stability and safe drilling, and achieves the purpose of inhibiting, plugging and chemical wall fixing.

Description

technical field [0001] The invention relates to the technical field of oilfield chemical drilling fluids, in particular to an anti-slump drilling fluid of a silicate-aluminate system. Background technique [0002] For shale, mud shale or volcanic rock formations with complex geological structures, developed fractures, easily fractured formations, and strong water sensitivity, during the drilling process, downhole complexities such as formation slurry, well wall collapse, leakage, and pipe sticking are prone to occur. ACCIDENT. According to statistics, well wall collapse and shrinkage instability caused by unstable shale formations account for more than 90% of the total number of drilling safety accidents. Therefore, effectively solving the problem of wellbore stability in the drilling process has become the focus and difficulty of current petroleum workers' research. [0003] At present, in the research and application of drilling fluids at home and abroad, although oil-ba...

Claims

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Application Information

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IPC IPC(8): C09K8/16C09K8/20
Inventor 张麒麟孟丽艳黄宁吕跃滨张希红
Owner SINOPEC SSC
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