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An environmentally friendly and easily degradable synthetic base drilling fluid and its preparation method

A technology of synthetic base and drilling fluid, which is applied in the field of drilling fluid, can solve the problems affecting the accuracy, etc., and achieve the effects of strong inhibition, low biological toxicity and good lubricity

Active Publication Date: 2021-12-10
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, to evaluate the degradability of drilling fluid, the chemical oxygen demand (COD) detection of the dichromate method is usually used, but when the chloride ion content exceeds 1000mg / L, it will affect the accuracy of COD detection

Method used

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  • An environmentally friendly and easily degradable synthetic base drilling fluid and its preparation method
  • An environmentally friendly and easily degradable synthetic base drilling fluid and its preparation method
  • An environmentally friendly and easily degradable synthetic base drilling fluid and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Add 10.0g of primary emulsifier BIO-EMUL and 5.0g of secondary emulsifier BIO-COAT into a tall stirring cup, and measure 320mL of Escaid with a graduated cylinder TM110. Pour it into a tall stirring cup that has weighed the emulsifier, stir at a high speed of 10000r / min for 5min, add 10.0g of calcium oxide, stir at a high speed of 10000r / min for 5min, add 80mL of 20% mass concentration Sodium acetate solution, stirred at a high speed of 10000r / min for 15min, added 12.0g of organic soil PF-MOGEL, 12.0g of fluid loss reducer PF-MOHFR, stirred at a high speed of 10000r / min for 10min, added 2.0g of flow type Regulator BIO-VIS, stir at a high speed of 10000r / min for 5min, finally add 260g of limestone, adjust the drilling fluid density to 1.2g / cm 3 , continue to stir at a high speed for 20 minutes at a rotating speed of 10000r / min, and then obtain an environmentally friendly and easily degradable synthetic base drilling fluid. After aging at 150°C for 16 hours, the performa...

Embodiment 2

[0042] Add 10.0g of primary emulsifier BIO-EMUL and 5.0g of secondary emulsifier BIO-COAT into a tall stirring cup, and measure 320mL of Escaid with a graduated cylinder TM 110. Pour it into a tall stirring cup that has weighed the emulsifier, stir at a high speed of 12000r / min for 5min, add 10.0g of calcium oxide, stir at a high speed of 12000r / min for 5min, add 80mL of 20% mass concentration Sodium acetate solution, stirred at a high speed of 12000r / min for 15min, added 10.0g organic soil PF-MOGEL, 10.0g fluid loss reducer PF-MOHFR, stirred at a high speed of 12000r / min for 10min, added 1.0g flow type Regulator BIO-VIS, stir at a high speed of 12000r / min for 5min, add 60.0g of drilling fluid contaminated soil (15% of the emulsion volume), stir at a high speed for 10min, add 260g of limestone, and continue at a high speed of 12000r / min Stir for 20 minutes, adjust the drilling fluid density to 1.2g / cm 3 , that is, an environmentally friendly and easily degradable synthetic ba...

Embodiment 3

[0044] Add 10.0g of primary emulsifier BIO-EMUL and 5.0g of secondary emulsifier BIO-COAT into a tall stirring cup, and measure 320mL of Escaid with a graduated cylinder TM 110. Pour it into a tall stirring cup that has weighed the emulsifier, stir at a high speed of 11000r / min for 5min, add 12.0g of calcium oxide, stir at a high speed of 11000r / min for 5min, add 80mL of 20% mass concentration Sodium acetate solution, stirred at a high speed of 11000r / min for 15min, added 10.0g of organic soil PF-MOGEL, 12.0g of fluid loss reducer PF-MOHFR, stirred at a high speed of 11000r / min for 10min, added 1.0g of flow type Regulator BIO-VIS, stir at a high speed of 11000r / min for 5min, add 40.0g of artificial seawater (10% of the emulsion volume), stir at a high speed of 11000r / min for 10min, add 260g of limestone, and continue to stir at a high speed for 20min to adjust Drilling fluid density up to 1.2g / cm 3 , that is, an environmentally friendly and easily degradable synthetic base dr...

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Abstract

The invention discloses an environmentally friendly and easily degradable synthetic base drilling fluid and a preparation method thereof. The environmentally friendly and easily degradable synthetic base drilling fluid consists of 65-90 volume parts of synthetic base oil and 10-35 volume parts of a mass concentration of 15-25 % organic brine solution constitutes the oil phase and the water phase respectively. The drilling fluid system also includes the main emulsifier, auxiliary emulsifier, flow regulator, alkalinity regulator, fluid loss control agent, organic soil and according to the engineering design. Safe density adjustment dosage of density regulator. The synthetic-based drilling fluid provided by the present invention has the following advantages: select environmentally friendly, non-toxic and easily degradable synthetic oil as the base oil, select environmentally friendly and easily degradable organic salt solution as the water phase, and select natural products or their modified products as the emulsifier of the system , fluid loss reducer, and prepare an environmentally friendly and easily degradable synthetic base drilling fluid to meet the increasingly stringent requirements for environmental protection operations.

Description

technical field [0001] The invention relates to the field of drilling fluids, in particular to an environmentally friendly and easily degradable synthetic base drilling fluid and a preparation method thereof. Background technique [0002] Compared with water-based drilling fluids, oil-based / synthetic-based drilling fluids have obvious advantages in wellbore stability, lubrication and anti-seizure, inhibition of shale hydration expansion, formation slurrying, and rapid drilling, etc. , offshore drilling, highly deviated directional wells, horizontal wells, various complex well sections and an important means of reservoir protection. [0003] At present, in the drilling of complex wells and unconventional oil and gas wells abroad, the application of oil-based / synthetic-based drilling fluids dominates. Since the 1980s in China, oil-based / synthetic-based drilling fluids have been used in some oil fields. In recent years, oil-based drilling fluids have been used for drilling in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/32
CPCC09K8/32
Inventor 刘雪婧耿铁刘卫丽罗健生党海锋
Owner CHINA NAT OFFSHORE OIL CORP