A kind of oil-based drilling fluid for shale gas development drilling

Abstract

The invention relates to an oil-based drilling fluid for development drilling of a shale gas, and belongs to the technical field of drilling fluids for petroleum drilling engineering. The oil-based drilling fluid is characterized by being prepared from the following components by weight percent: 0.2% to 2% of main emulsifier, 0.1% to 1% of auxiliary emulsifier, 0% to 1.5% of wetting agent, 0.2% to 1.5% of alkalinity regulating agent, 0% to 1.5% of organic soil, 0% to 1.5% of tackifier, 0.2% to 2% of filtrate reducer, 0% to 80% of weighting agent, 0% to 20% of water phase and the balance of oil phase. The oil-based drilling fluid can be used for meeting a special requirement of the shale gas drilling to the drilling fluid, and is good in stability, inhibitory capability and lubricity even under low and high temperatures. The oil-based drilling fluid has the characteristics of high dynamic plastic ratio, low plastic viscosity, wide application range and good economic benefit.

Description

Technical field: [0001] The invention relates to an oil-based drilling fluid used for shale gas development and drilling, and belongs to the technical field of drilling fluids for petroleum drilling engineering. Background technique: [0002] Drilling fluid refers to the general term of various circulating fluids that meet the needs of drilling work with its multiple functions in the process of oil and gas drilling. It mainly has the functions of carrying and suspending cuttings, stabilizing the well wall and balancing formation pressure, cooling and lubricating drilling tools, It is an important part of drilling engineering technology to transmit hydrodynamic force and protect oil and gas layers. [0003] Shale gas is an unconventional energy source. Existing data show that the geological reserves of shale gas are more than 1 trillion cubic meters, and the recoverable reserves are huge. However, the development of shale gas is also difficult. From the perspective of drillin...

AI Technical Summary

Problems solved by technology

[0003] Shale gas is an unconventional energy source. Existing data show that the geological reserves of shale gas are more than 1 trillion cubic meters, and the recoverable reserves are huge. However, the development of shale gas is also difficult. From the perspective of drilling, using The wellbore structure of the long horizontal well, and the formation is mud shale, which is easy to hydrate, expand and collapse, leading to the instability of the wellbore wall, which puts forward higher requirements for the use of drilling fluid