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An oil-based drilling fluid with low emulsifier addition

An oil-based drilling fluid and emulsifier technology, applied in the field of drilling fluid, can solve the problem of low demulsification voltage of drilling fluid

Active Publication Date: 2020-08-28
JINGZHOU JIAHUA TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of existing emulsifiers leads to low demulsification voltage of drilling fluids

Method used

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  • An oil-based drilling fluid with low emulsifier addition
  • An oil-based drilling fluid with low emulsifier addition

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preparation example Construction

[0031] In the present invention, the raw material for preparing the low-emulsifier added oil-based drilling fluid includes an emulsifier. In the present invention, the emulsifier is preferably a mixture of long-chain fatty acid amides and dimer acids. In the present invention, the mass ratio of the long-chain fatty acid amide to the dimer acid is preferably (90-100):(30-50), more preferably (92-98):(33-47), most preferably (94~96):(37~42). In the present invention, the preparation method of the long-chain fatty acid amides preferably comprises the following steps:

[0032] Under vacuum conditions, oleic acid, tall oil fatty acid, diethanolamine and triethanolamine are thermally mixed to obtain a thermal mixture;

[0033] Heat treatment of the hot mixture yields long chain fatty acid amides.

[0034] In the invention, oleic acid, tall oil fatty acid, diethanolamine and triethanolamine are thermally mixed under vacuum conditions to obtain a thermal mixture. In the present in...

Embodiment 1

[0055] 20 parts of oleic acid and 25 parts of tall oil fatty acid are heated to 120° C., sealed and evacuated until the vacuum degree is lower than -0.1 MPa, and 30 parts of diethanolamine and 20 parts of triethanolamine are inhaled. After heat preservation reaction for 2 hours, continue to heat up to 330°C (heating time is 2h), heat preservation reaction for 2 hours, and cool to 210°C to obtain long-chain fatty acid amides. The long-chain fatty acid amide and the dimer acid are mixed according to the mass ratio of 90:40 to obtain the emulsifier.

[0056] Mix and stir 20 parts of acrylic acid and 30 parts of styrene evenly, heat to 90°C, react for 2 hours, add 20 parts of maleic anhydride, heat to 160°C, keep warm for 2 hours, and then continue to add 30 parts of tripolymer Acid, heated to 210 ° C for 2 hours to obtain modified styrene acrylic resin. The sulfonated asphalt, humic acid amide resin and modified propylene phenylacetate are mixed according to the mass ratio of 30...

Embodiment 2

[0062] 20 parts of oleic acid and 25 parts of tall oil fatty acid are heated to 120° C., sealed and evacuated until the vacuum degree is lower than -0.1 MPa, and 30 parts of diethanolamine and 20 parts of triethanolamine are inhaled. After heat preservation reaction for 2 hours, continue to heat up to 330°C (heating time is 2h), heat preservation reaction for 2 hours, and cool to 210°C to obtain long-chain fatty acid amides. The long-chain fatty acid amide and the dimer acid are mixed according to the mass ratio of 90:35 to obtain the emulsifier.

[0063] Mix and stir 20 parts of acrylic acid and 30 parts of styrene evenly, heat to 90°C, react for 2 hours, add 20 parts of maleic anhydride, heat to 160°C, keep warm for 2 hours, and then continue to add 30 parts of tripolymer Acid, heated to 210 ° C for 2 hours to obtain modified styrene acrylic resin. The sulfonated asphalt, humic acid amide resin and modified propylene phenylacetate are mixed according to the mass ratio of 30...

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Abstract

The invention provides low emulsifier-added oil-based drilling fluid. The low emulsifier-added oil-based drilling fluid comprises the following components: oil, an emulsifier, an alkalinity conditioning agent, organic bentonite, a filtrate loss reducer, calcium chloride and water. The emulsifier content of the low emulsifier-added oil-based drilling fluid is low, but the low emulsifier-added oil-based drilling fluid can satisfy the basic performance requirement of the oil-based drilling fluid. According to the experiment result of the embodiments, the density of the low emulsifier-added oil-based drilling fluid is 1.4-2.5 g / cm<3>, the aging temperature can reach as high as 220 DEG C, the plastic viscosity can reach as low as 20 mPa.s, and the demulsification voltage can reach as high as 1763 V. In addition, after brine and bentonite invasion, the anti-aging temperature, viscosity, dynamic shearing force and demulsification voltage of the drilling fluid cannot be almost changed, and the drilling fluid has excellent anti-pollution performance.

Description

technical field [0001] The invention relates to the field of drilling fluid technology, in particular to an oil-based drilling fluid with low emulsifier added. Background technique [0002] Drilling fluid refers to the general term of various circulating fluids that meet the needs of drilling work with its multiple functions in the process of oil and gas drilling. It mainly has the functions of carrying and suspending cuttings, stabilizing the well wall, balancing formation pressure, cooling and lubricating drilling tools, It is an important part of drilling engineering technology to transmit hydrodynamic force and protect oil and gas layers. [0003] Oil-based drilling fluid is a drilling fluid with oil as the continuous phase relative to water-based drilling fluid. Compared with water-based drilling fluid, oil-based drilling fluid has many advantages such as high temperature resistance, salt and calcium intrusion resistance, wellbore stability, good lubricity and less dam...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/03C09K8/32
CPCC09K8/03C09K8/32
Inventor 许明标由福昌舒曼
Owner JINGZHOU JIAHUA TECH
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