Lubricating defoamer for drilling fluid and preparation method thereof

Abstract

The invention provides a lubricating defoamer for a drilling fluid and a preparation method thereof. The lubricating defoamer for the drilling fluid is prepared from the following raw materials by weight percent: 30-43% of fatty acid, 15-25% of organic amine, 30-40% of base oil, 2-6% of penetrating agent and 10-15% of defoamer. Compared with the prior art, the lubricating defoamer for the drilling fluid is capable of functioning as the lubricant and the defoamer at the same time; the field operation steps are simple and the production cost is reduced.

Description

technical field [0001] The invention relates to a lubricating defoamer for drilling fluid and a preparation method thereof. Background technique [0002] With the expansion and deepening of oil and gas exploration and development, the intensity of drilling and development has been increasing, the difficulty of drilling has increased, and the complexity of drilling has become more prominent. Since the 1980s, my country has carried out the research and application of horizontal well drilling technology, and excessive friction and torque are a major unfavorable factor in the process of horizontal well drilling. During the drilling process of horizontal wells and directional wells, when the positive pressure of the drill string on the well wall of the inclined well section is constant, the low drilling fluid lubrication coefficient makes the frictional resistance of the drill pipe and the well wall relatively smaller, which can greatly reduce the friction between the drill pipe ...

AI Technical Summary

Problems solved by technology

The foaming of drilling fluid will bring many adverse effects to drilling engineering

First of all, when the drilling fluid foams seriously, the density of the drilling fluid measured on the ground will be greatly reduced, resulting in a drop in the pressure of the entire fluid column, which will reduce the pump efficiency. At the same time, the foaming of the drilling fluid will also deteriorate the lubricating performance of the mud. , the efficiency of cooling the drill bit is reduced

Secondly, the foaming of the drilling fluid will increase the viscosity and shear of the drilling fluid on the surface, and the flow performance will deteriorate, which will bring inconvenience to drilling

Third, once a large number of air bubbles are generated in the drilling fluid, if the treatment is not timely, the light one will cause a well kick, and the severe one will cause a series of downhole complex accidents such as blowout and well collapse.

[0004] Due to the lack of compound drilling fluid treatment agents with excellent performance, in order to solve the above problems, the usual treatment method is to add lubricant and defoamer to the drilling fluid at the same time, which has the disadvantages of large dosage, high cost, and great influence on the rheology of the drilling fluid. Disadvantages such as large size and complex on-site operation procedures

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