Oil-based drilling fluid shaft completion cleaning fluid and preparation method thereof

Abstract

The invention relates to the technical field of drilling fluid cleaning fluids, particularly to an oil-based drilling fluid shaft completion cleaning fluid and a preparation method thereof. The oil-based drilling fluid shaft completion cleaning fluid comprises raw materials in percentage by weight as follows: 25%-30% of an organic acid solution, 1%-3% of an emulsifier, 0.5%-0.7% of an organic solvent, 0.5%-2% of a quick penetrating agent, 0.05%-0.1% of a corrosion inhibitor and the balance of base oil. The oil-based drilling fluid shaft completion cleaning fluid is an oil-based cleaning fluid, is an acid-in-oil emulsion, is applied after open hole completion or screen pipe (slotted pipe) completion, can be used for restoring near-wellbore holes between a shaft and a stratum, can be used for opening an oil and gas channel, has the higher cleaning rate, can be used for clearing away substances adhered to the shaft, can be used for dredging a near-wellbore reservoir channel, can be used for washing a screen pipe (slotted pipe) and can be used for protecting an oil-gas bed.

Description

technical field [0001] The invention relates to the technical field of drilling fluid cleaning fluid, and relates to an oil-based drilling fluid wellbore completion cleaning fluid and a preparation method thereof. Background technique [0002] The ultimate goal of drilling and well completion is to drill the reservoir and form a channel for oil and gas flow to establish good production conditions for oil and gas wells. Any phenomenon that prevents fluid from flowing from the reservoir around the wellbore to the bottom of the well is called damage to the reservoir. Before the oil and gas layers are drilled, the rocks and mineral components of the oil and gas reservoirs, and the fluids they contain are relatively in a physical, chemical, thermodynamic and hydrodynamic equilibrium state. During the construction process, due to the effects of physical and chemical factors, the original equilibrium state may be destroyed, the reservoir will be seriously damaged, and the productiv...

AI Technical Summary

Problems solved by technology

[0007] In addition, due to the protection of oil and gas layers, the reason for using oil-based drilling fluid is that the reservoir is highly water-sensitive. If water-based cleaning fluid is used to Cleaning the oil-based drilling fluid will be completely contradictory and contrary to the purpose of oil-based drilling fluid to protect the reservoir

[0008] Therefore, the water-based cleaning fluid currently in public use is actually not suitable for oil-based drilling fluids, but there is no oil-based cleaning solution specifically for oil-based drilling fluids liquid