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High-temperature water-in-oil drilling fluid

A technology for water-in-oil drilling fluid and drilling fluid, which is applied in drilling compositions, chemical instruments and methods, etc., can solve problems such as difficulty and low fluid loss, meet the requirements of temperature resistance and overcome temperature resistance. Effects of Incapacity Problems

Inactive Publication Date: 2011-04-27
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the maximum bottom hole temperature of the sulfonated drilling fluid commonly used in my country is 179°C. In this case, it will be more difficult to maintain good rheology and low fluid loss of the drilling fluid, and differential pressure jams will occur. The possibility of downhole complex situations such as drilling and lost circulation and blowout will be greatly increased

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] a, 70 parts of base oil, 3 parts of organic bentonite, 2 parts of oxidized pitch, 2 parts of sulfonated pitch, 20 parts of CaCl with a mass concentration of 20% 2 Aqueous solution, 6 parts of calcium oxide, 1.5 parts of UZEMUL-S, 2 parts of ABS and barite;

[0013] b. Preparation process: add organic bentonite to white oil and stir at high speed for 20 minutes, add the required main emulsifier UZEMUL-S, auxiliary emulsifier ABS and calcium oxide; add brine CaCl under high speed stirring 2 (20% aqueous solution)), stir at high speed for 20 minutes; add fluid loss reducer and wetting reversal agent, stir at high speed for 20 minutes, add barite to adjust the drilling fluid density to the required value, stir at high speed for 20 minutes, and put it into the aging tank Roll aging at 240°C for 16 minutes.

[0014] c. Measurement of electrical stability: Measure the demulsification voltage of water-in-oil drilling fluid before and after rolling aging at room temperature wit...

example 2

[0032] a. Formula: 80 parts of base oil, 5 parts of organic bentonite, 3 parts of oxidized pitch, 4 parts of sulfonated pitch, 40 parts of CaCl with a mass concentration of 20% 2 Aqueous solution, 8 parts of calcium oxide, 4 parts of UZEMUL-S, 2-5 parts of ABS and barite;

[0033] b. Preparation process: add organic bentonite to white oil and stir at high speed for 20 minutes, add the required main emulsifier UZEMUL-S, auxiliary emulsifier ABS and calcium oxide; add brine CaCl under high speed stirring 2 (20% aqueous solution)), stir at high speed for 20 minutes; add fluid loss reducer and wetting reversal agent, stir at high speed for 20 minutes, add barite to adjust the drilling fluid density to the required value, stir at high speed for 20 minutes, and put it into the aging tank Roll aging at 240°C for 16 minutes.

[0034] c. Determination of electrical stability: Measure the demulsification voltage of the water-in-oil drilling fluid before and after rolling aging at room ...

Embodiment 3

[0052] a. Formula: 90 parts of base oil, 7 parts of organic bentonite, 5 parts of oxidized pitch, 5 parts of sulfonated pitch, 60 parts of CaCl with a mass concentration of 50% 2 Aqueous solution, 10 parts of calcium oxide, 5.5 parts of UZEMUL-S, 5 parts of ABS and barite;

[0053] b. Preparation process: add organic bentonite to white oil and stir at high speed for 20 minutes, add the required main emulsifier UZEMUL-S, auxiliary emulsifier ABS and calcium oxide; add brine CaCl under high speed stirring 2 (20% aqueous solution)), stir at high speed for 20 minutes; add fluid loss reducer and wetting reversal agent, stir at high speed for 20 minutes, add barite to adjust the drilling fluid density to the required value, stir at high speed for 20 minutes, and put it into the aging tank Roll aging at 240°C for 16 minutes.

[0054] c. Determination of electrical stability: Measure the demulsification voltage of the water-in-oil drilling fluid before and after rolling aging at room...

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Abstract

The invention relates to a high-temperature water-in-oil drilling fluid which is composed of the following components in parts by weight: 70-90 parts of base oil, 3-7 parts of organic bentonite, 2-5 parts of oxidized asphalt, 2-5 parts of sulfonated gilsonite, 20-60 parts of CaCl2 aqueous solution of which the mass concentration is 20%, 6-10 parts of calcium oxide, 1.5-5.5 parts of UZEMUL-S, 2-5 parts of ABS (acrylonitrile butadiene styrene) and barite, wherein the base oil is non-blooming mineral oil with low aromatic hydrocarbon; the UZEMUL-S is a main emulsifier, the HLB (hydrophile-lipophile balance) value is 2.5, and the UZEMUL-S is formed by synthetizing an organic acid and an organic acid amide; and the ABS auxiliary emulsifier is sodium dodecyl benzene sulfonate, and the HLB value is 10. The invention resists temperature of 240 DEG C, can overcome the difficulty of insufficient heat-resistant capability of the existing drilling fluid and is favourable for satisfying the requirement of drilling fluid heat-resistant capability for deep wells and ultra deep wells.

Description

technical field [0001] The invention relates to a water-in-oil drilling fluid used in the technical field of petroleum geological exploration and development, which belongs to high-temperature (temperature up to 240° C.) oil-based drilling fluid applied to deep and ultra-deep wells. Background technique [0002] Exploration and development of deep oil and natural gas is the main way to solve the problem of stabilizing and increasing production of my country's petroleum industry. Therefore, the drilling of deep wells and ultra-deep wells will surely become an important aspect of my country's petroleum industry. The deeper the wellbore, the higher the temperature inside the wellbore due to the existence of the geothermal gradient. The bottom hole temperature of ultra-deep wells exceeding 7000m in western oilfields (temperature gradient of 2.5-3.0℃ / 100m) and deep wells exceeding 5000m in eastern oilfields (temperature gradient of 3.5-4.3℃ / 100m) is likely to exceed 200℃. Under...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/36
Inventor 王茂功李英敏孙金声
Owner BC P INC CHINA NAT PETROLEUM CORP
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