A kind of antiwear drag reducing agent for drilling fluid and preparation method thereof

Abstract

The invention relates to a wear-resistant drag reducer for drilling fluid and a preparation method thereof. The wear-resistant drag reducer is characterized in that a formula of the wear-resistant drag reducer is prepared from the following main raw materials: vegetable oil acid, cotton seed oil, sulfur powder, diethanol amine and kerosene; the auxiliary raw materials comprise tributyl phosphate, organic soil and T323 anti-wear reagent at extreme pressure. The wear-resistant drag reducer for drilling fluid comprises the following components in percentage by weight based on the total amount of the drag reducer: 7-13 percent of vegetable oil acid, 26-31 percent of cotton seed oil, 6-11 percent of sulfur powder, 3-5 percent of diethanol amine, 27-29 percent of kerosene and 12-17 percent of auxiliary materials and other materials. The method for preparing the wear-resistant drag reducer for drilling fluid comprises a sulfonation reaction, an amidation reaction and a mixed reaction. When the wear-resistant drag reducer is used for drilling, the drag reducer can be adsorbed to the surface of a drilling tool preferentially, a dense high-strength protective film is generated, the lubricating property of the drilling fluid is reduced, the friction and wear of the metal surface are reduced, an extreme pressure lubrication coefficient and a mud cake adhesion coefficient of the drilling fluid are effectively reduced, blockage and other accidents in the drilling process are reduced.

Description

Technical field [0001] The invention relates to the technical field of petroleum exploitation chemistry, in particular to an anti-wear drag reducer for drilling fluid and a preparation method thereof. Background technique [0002] With the deepening of oil and gas exploration and development, there are more and more deep wells, highly deviated wells, and horizontal wells. During the construction of such wells, due to the long construction period or the high degree of borehole trajectory, the difference between drilling tools and casing Due to mutual friction, the drill pipe is worn out, and the casing is locally thinned or worn, which causes the wellbore to fail to meet the pressure requirements, which brings serious hidden dangers or major accidents to the drilling production, reduces the life of the oil and gas wells, and is very likely to cause major Economic losses and casualties. In the process of oil and gas exploitation and drilling, ordinary lubricants lose their activit...

AI Technical Summary

Problems solved by technology

[0002] With the deepening of oil and gas exploration and development, there are more and more deep wells, highly deviated wells, and horizontal wells. In the construction process of such wells, due to the long construction period or the high degree of dogleg of the wellbore trajectory, the gap between the drilling tool and the casing Due to the mutual friction between them, the drill pipe is worn, and the casing is partially worn or worn out, so that the wellbore cannot meet the pressure-bearing requirements, which brings serious hidden dangers to drilling production or causes major accidents, reduces the production life of oil and gas wells, and is likely to cause major damage. economic losses and casualties

In the process of drilling for oil and gas production, under the conditions of high temperature, high density, high solid phase, and strong alkali, ordinary lubricants lose their activity due to factors such as cross-linking, degradation, volatilization, and demulsification, and their lubrication and drag reduction performance are greatly reduced.

In addition, during the drilling process of the highly deviated well section, the contact area between the drill string and the borehole wall increases, the frictional resistance increases, the wellbore cleaning is not effective, and the borehole wall is unstable, which is likely to cause diameter shrinkage, collapse and cuttings. bed formation, increasing torque and friction during drilling

If the lubricity and drag reduction are not well controlled, it is easy to cause complex accidents such as sticking and mud bagging, which will increase the flow resistance and reduce the ROP