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Biodiesel drilling fluid and preparation method thereof

A technology for biodiesel and drilling fluids, applied in chemical instruments and methods, drilling compositions, etc., to achieve the effects of excellent lubricating performance, low emissions, and low sulfur content

Inactive Publication Date: 2012-06-20
山东华阳油业有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] For this reason, the technical problem to be solved by the present invention is that the drilling fluid in the prior art is difficult to meet the difficulties of low pollution, high temperature resistance and high lubricating performance at the same time, and then provide an environmentally friendly drilling fluid that is easy to degrade, high temperature resistance and good performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Take 100mL of biodiesel, add 3g of montmorillonite modified by quaternary ammonium salt type surfactant, 4g of asphalt FF-2, 10g of organic lignite WGF, stir at high speed for 15 minutes, and according to the "Oil-based Drilling Fluid Field Test Procedure" announced The API fluid loss of the mixture measured by the national standard method is 8mL, the apparent viscosity is 25.5mPas, the plastic viscosity is 19mPas, and the dynamic shear force is 6.5Pa.

[0056] It shows that the drilling fluid of the present invention has good fluid loss and rheological properties.

Embodiment 2

[0058]Take 100mL of biodiesel, add 6g of organic soil, 8g of asphalt FF-2, 3g of organic lignite WGF, and 3g of wetting agent Tween 80 and stir at high speed for 15 minutes to obtain the biodiesel drilling fluid of the present invention. After aging the prepared drilling fluid at 180°C for 16 hours, the drilling fluid was left to stand for 48 hours without delamination, and according to the national standard method published in the "Oil-based Drilling Fluid Field Test Procedure", the API filtration volume was determined to be 12mL, and the apparent viscosity It is 40mPas, the plastic viscosity is 35mPas, and the dynamic shear force is 5Pa.

[0059] It shows that the drilling fluid of the present invention has good high-temperature stability and can be applied in formations with relatively high temperatures.

Embodiment 3

[0061] Take 100mL of biodiesel, add 5g of organic bentonite, 7g of asphalt FF-2, 7g of lignite modified by long-chain alkylamine and 2g of emulsifier glycerin, then add 10g of sodium bentonite to test the anti-cutting ability of the drilling fluid obtained, stir at high speed for 15 The desired biodiesel drilling fluid is obtained in minutes. And according to the national standard method published in the "Oil-based Drilling Fluid Field Test Procedure", the API fluid loss is 8mL, the apparent viscosity is 34mPas, the plastic viscosity is 26mPas, and the dynamic shear force is 8Pa.

[0062] It shows that the drilling fluid of the present invention has excellent ability to resist cuttings pollution, has a large cuttings (clay) capacity, and will not cause other problems due to soil erosion in practical applications.

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Abstract

The invention belongs to the field of oilfield chemistry, and particularly relates to a safe and easily-degradable drilling fluid based on biodiesel and a preparation method thereof. The biodesel drilling fluid comprises biodiesel, and 3-10 grams of organic soil, 1-15 grams of organic lignite and 3-10 grams of asphalt added into every 100 mL of biodiesel. According to the invention, biodiesel instead of crude oil and diesel is used for researching a biodiesel drilling fluid system, so that the requirements of excellent lubricating performance, strong rejection capability, high well wall stability and high temperature resistance on the conventional oil-based drilling fluid can be met; the drilling fluid has low sulfur content and low emission of sulfur dioxide and sulfides; and moreover, the drilling fluid does not contain aromatic alkane which causes pollution on the environment, so that damage to the environment is very low, biodegradation occurs very easily, and excellent environmental protection characteristic is achieved.

Description

technical field [0001] The invention belongs to the field of oilfield chemistry, and in particular relates to a safe and easily degradable drilling fluid based on biodiesel and a preparation method thereof. Background technique [0002] Drilling fluid is the circulating medium used in the drilling process. Drilling fluid mainly completes the tasks of suspension, pressure control, formation stability, buoyancy, lubrication and cooling during the drilling process. Drilling fluid has the functions of: cleaning the bottom of the well, carrying cuttings; cooling and lubricating the drill bit and drill string; balancing the lateral pressure of the well wall rock, sealing and stabilizing the well wall; balancing the formation pressure; Cuttings; effectively transmit hydraulic power; bear part of the gravity of the drill pipe and casing; provide a large amount of data on the drilled formation; break rocks through hydraulic and other important functions. [0003] Drilling fluid can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/20
Inventor 孙明波林殷平商红岩徐铭捷
Owner 山东华阳油业有限公司
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