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Composition for anti-collapse drilling fluid capable of reducing collapse pressure, anti-collapse drilling fluid and anti-collapse method

A drilling fluid and composition technology, applied in the field of anti-collapse drilling fluid composition, which can solve problems such as changes in rock stress distribution, deterioration, and increase in rock pore pressure

Inactive Publication Date: 2013-08-21
CNPC DRILLING RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally speaking, the entry of water into the mud shale near the wellbore is a prerequisite for the instability of the wellbore. On the one hand, the entry of water increases the pore pressure of the rock near the wellbore and reduces the effective stress of the surrounding rock, which easily causes the rock around the wellbore to become unstable. The stress distribution is seriously changed or deteriorated. On the other hand, the strength of shale rocks will decrease after absorbing water, which will lead to the instability and collapse of rocks that meet the stability rules.

Method used

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  • Composition for anti-collapse drilling fluid capable of reducing collapse pressure, anti-collapse drilling fluid and anti-collapse method

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0038] This preparation example is used to illustrate the preparation of the wetting reversal agent provided by the present invention.

[0039] Add 0.01g of sodium dodecylsulfonate and 25mL of water into a four-necked flask equipped with an electric stirrer, a reflux condenser and a thermometer, and control the temperature at 40°C to stir and mix well, then slowly add the well-mixed A mixture of 3g styrene, 3.5g butyl acrylate and 3.5g methacrylic acid, after emulsification for 0.1 hour, the temperature was raised to 80°C, then 0.01g potassium persulfate was added and reacted for 6 hours, then the obtained emulsion containing copolymer was cooled Bring to room temperature 25°C and add 2g of ammonium sulfate to stir the copolymer to coagulate and filter to obtain 10g of copolymer (referred to as RFJ-1), wherein the number average molecular weight of the copolymer is 1000.

preparation example 2

[0041] This preparation example is used to illustrate the preparation of the wetting reversal agent provided by the present invention.

[0042] Add 0.5g of sodium dodecylsulfonate and 25mL of water into a four-neck flask equipped with an electric stirrer, a reflux condenser and a thermometer, and control the temperature at 30°C to stir and mix well, then slowly add the well-mixed The mixture of 2.5g styrene, 4.5g butyl acrylate and 3g methacrylic acid was emulsified for 0.5 hours and the temperature was raised to 95°C, then 0.002g potassium persulfate was added and reacted for 2 hours, then the emulsion containing the copolymer was cooled Bring to room temperature 25°C and add 2g of ammonium sulfate to stir the copolymer to coagulate and filter to obtain 9.8g of copolymer (referred to as RFJ-2), wherein the number average molecular weight of the copolymer is 5000.

preparation example 3

[0044] This preparation example is used to illustrate the preparation of the wetting reversal agent provided by the present invention.

[0045] Add 0.2g of sodium dodecylsulfonate and 25mL of water into a four-necked flask equipped with an electric stirrer, a reflux condenser and a thermometer, and control the temperature at 35°C to stir and mix well, then slowly add the well-mixed The mixture of 4g styrene, 2.5g butyl acrylate and 3.5g methacrylic acid was emulsified for 0.5 hours and the temperature was raised to 85°C, then 0.005g potassium persulfate was added and reacted for 4 hours, then the emulsion containing the copolymer was cooled Bring to room temperature 25°C and add 2g of ammonium sulfate to stir the copolymer to coagulate and filter to obtain 9.9g of copolymer (referred to as RFJ-3), wherein the number average molecular weight of the copolymer is 2000.

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Abstract

The invention provides a composition for an anti-collapse drilling fluid, the anti-collapse drilling fluid, and an anti-collapse method. The composition for the anti-collapse drilling fluid comprises bentonite, a filtrate reducer and a viscosity reducer, wherein the anti-collapse drilling fluid further comprises a reverse wetting agent and a reverse wetting agent auxiliary, the reverse wetting agent is a copolymer of acrylate monomer and styrene, and the reverse wetting agent auxiliary comprises aliphatic amine and asphalt. The anti-collapse drilling fluid provided by the invention is excellent in anti-collapse performance.

Description

technical field [0001] The invention relates to an anti-slump drilling fluid composition, an anti-slump drilling fluid and an anti-slump method. Background technique [0002] The shale formation is easy to cause the instability of the borehole wall, which not only affects the drilling speed and the quality of logging and cementing, but also makes it impossible to drill the target layer in some areas, thus affecting the realization of the purpose of exploration and development. Wellbore instability is a mechanical problem caused by chemical action or the coupling action of chemistry and mechanics. Generally speaking, the entry of water into the mud shale near the wellbore is a prerequisite for the instability of the wellbore. On the one hand, the entry of water increases the pore pressure of the rock near the wellbore and reduces the effective stress of the surrounding rock, which easily causes the rock around the wellbore to become unstable. The stress distribution is serio...

Claims

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Application Information

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IPC IPC(8): C09K8/24
Inventor 孙金生杨宇平张振华
Owner CNPC DRILLING RES INST
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