Environment-friendly pseudo oil-based drilling fluid and preparation method thereof

Abstract

The invention discloses an environment-friendly pseudo oil-based drilling fluid and a preparation method thereof. The drilling fluid comprises the following raw materials in ratio: 0.6-0.8 part of polyamine inhibitor, 12-15 parts of methyl glucoside, 2-3 parts of nano-emulsion, 0.2-0.4 part of high temperature protective agent, 0-30 parts of barite, 1-3 parts of bentonite, 0.1-0.3 part of sodium carbonate, 0.1-0.3 part of sodium hydroxide, 0.2-0.5 part of low viscosity parker, 0.1-0.2 part of zwitter-ion coating agent, and 80-100 parts of water. The preparation method comprises the following steps: 1) respectively adding sodium hydroxide and sodium carbonate in water, and stirring; 2) adding the bentonite in the water, stirring at high speed, and standing at normal temperature; 3) stirring the solution of the step 2), adding methyl glucoside in the stirring process, and continuously stirring; 4) orderly adding the zwitter-ion coating agent, the low viscosity parker, the high temperature protective agent, the polyamine inhibitor and the nano-emulsion in the solution in the step 3) at intervals of stirring; and 5) regulating the density of the drilling fluid.

Description

technical field [0001] The invention relates to drilling fluid, in particular to an environment-friendly imitation oil-based drilling fluid and a preparation method of the drilling fluid. Background technique [0002] Drilling fluid is a general term for various circulating fluids that meet the needs of drilling work with its multiple functions during the development of oil and gas wells, and is the blood in the development of oil and gas wells. Oil-based drilling fluid has good inhibition, plugging, lubricity and rheological properties, and has been widely used in complex and difficult wells. However, oil-based drilling fluids not only have the disadvantages of high preparation costs and high requirements for solids control equipment, but also have difficulties in environmental protection disposal of cuttings and waste fluids and difficult rheological control. [0003] In order to meet the development requirements of complex wells and difficult wells, and to overcome the d...

AI Technical Summary

Problems solved by technology

However, oil-based drilling fluid not only has the disadvantages of high preparation cost and high requirements for solid control equipment, but also has difficulties in environmental protection disposal of cuttings and waste fluid and difficult rheological control.

[0003] In order to meet the development requirements of complex wells and difficult wells, and to overcome the defects of oil-based drilling fluids, the industry has intensified research on high-efficiency water-based drilling fluids, and various research results have been frequently reported in public publications, such as China "Quick adsorption, strong inhibition, low damage high-efficiency water-based drilling fluid" disclosed in patent literature (public number: CN 101717624, publication date: June 2, 2010), "a strong inhibition, high-lubrication water-based drilling fluid and its preparation method" (publication number: CN 102433109, publication date: May 2, 2012), etc., but so far there is no technical disclosure identical or similar to the content of the present invention

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