Drilling method of reinforcing-while-drilling shale

Abstract

The invention discloses a drilling method of reinforcing-while-drilling shale, and relates to the technical field of drilling. Based on the bionic technology, the characteristics of marine organism mussel are simulated, the bionic drilling fluid system of well wall rock can be efficiently reinforced while drilling under the underground environment conditions, the drilling fluid formula is adjusted in time in the drilling process, a firm and dense bionic shell can be formed on the well wall according to the action mechanism of bionic wall-fixing drilling fluid, and the problems of well leakage during drilling, well wall instability, wall-fixing-while-drilling, safety density window narrowness and the like are solved. The real mechanical-chemical coupling is achieved, and the well wall is kept stable and reinforced.

Description

technical field [0001] The invention relates to the technical field of drilling, in particular to the wall-solidification technology for mud shale well sections. Background technique [0002] The formula and functional parameters of conventional drilling fluid, especially the content of bentonite in drilling fluid is 40-60g / L, the content of anti-slumping agent is 1.5-20g / L, the viscosity of drilling fluid is 40-50s, and the shear force is 1.5-5Pa . [0003] The formula of conventional drilling fluid: it is composed of clean water, bentonite powder, soda ash, flocculation coating agent, fluid loss reducer, anti-slump agent and lubricant, among which, bentonite powder accounts for 4-6%, soda ash accounts for 0.5%, and flocculation coating Agents account for 0.3%, fluid loss additives account for 0.6%, anti-slump agents account for 2%, and lubricants account for 1-2%. [0004] Main parameters of conventional drilling fluid performance: Density 1.05g / cm 3 , Marsh funnel visc...

AI Technical Summary

Problems solved by technology

[0006] However, conventional drilling fluids still have disadvantages: when drilling special formations, such as shale that is easy to collapse, the ability to stabilize the well wall is insufficient, and the construction is often blocked, resulting in complicated and repeated reaming downhole, resulting in a lot of time, material and manpower losses.

However, after adding bionic shale inhibitor and bionic wall-solidifying agent to the drilling fluid, the viscosity and shear force of the drilling fluid will increase, accompanied by foaming, and the performance of the drilling fluid will not be stable