Surfactant for drilling fluid and preparation method thereof

Abstract

The invention provides a surfactant for drilling fluid and a preparation method of the surfactant. The surfactant is prepared from raw materials as follows: mineral oil, n-butyl alcohol oleate, liquidparaffin, methyl silicone oil, an emulsifier and ethyl p-hydroxybenzoate, wherein the mineral oil is one or two of No.5 white oil and No.7 white oil. The preparation method comprises steps as follows: the mineral oil, n-butyl alcohol oleate, liquid paraffin, methyl silicone oil and the emulsifier are added to a reactor and are sufficiently mixed and stirred; the materials in the reactor are heated and emulsified; ethyl p-hydroxybenzoate is added at certain temperature, the materials are sufficiently mixed and stirred, and the surfactant is obtained after cooling. The surfactant is good in performance and prepared with a simple process, has higher resistance to compression and guarantees that the drilling fluid has lower circulating density and higher suspended rock debris carrying capacity at the shaft bottom under high pressure, complex underground accidents are avoided or reduced effectively, and drilling quality and efficiency are improved; the surfactant still has good performanceat high temperature, can be resistant to 10% compound brine pollution and has good inhibiting performance for lubrication.

Description

technical field [0001] The invention relates to a petroleum drilling aid, in particular to a surfactant for drilling fluid. The invention also relates to a preparation method of the surfactant for drilling fluid. Background technique [0002] Drilling fluid is an important fluid in drilling engineering, and its performance is directly related to the quality of drilling, and plays a crucial role in the oil recovery efficiency of an oil field. There are many kinds of surfactants on the market at present, but they often cannot be both efficient and environmentally friendly. Currently commonly used surfactants that can meet environmental protection requirements have certain deficiencies in their performance. It is difficult to effectively surface active and ensure the high-efficiency performance of drilling fluids. [0003] The inventor retrieved the following relevant patent documents: CN104962247A discloses a lubricating and plugging agent for drilling fluid and its preparat...

AI Technical Summary

Problems solved by technology

[0004] Some of the above technologies use raw materials with strong alkalinity, large molecular weight, not easy to degrade, and easy to cause environmental pollution to the land

And the production process is complicated and the cost is high

The above technologies have a great impact on how to make the surfactant used in drilling fluid have strong compression resistance, ensure that the drilling fluid has a low circulation density under high pressure at the bottom of the well, enhance the ability to carry cuttings in suspension, reduce complex downhole accidents, and improve drilling efficiency. Quality and efficiency, while having environmental protection functions, did not give a specific guidance plan

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