Drilling method of reinforcing-while-drilling shale

A mud shale and drilling technology, applied in the field of solid wall of mud shale well section, can solve the problems of time, material resources, manpower loss, drilling fluid viscosity and shear force increase, and drilling fluid performance is not easy to stabilize, etc. The effect of drilling safety, less amount of anti-slump agent, and reducing the aging effect of complex failures

Active Publication Date: 2016-02-03
SINOPEC SSC +1
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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, resulti

Method used

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Embodiment Construction

[0036] In the drilling process, the present invention is based on the conventional drilling fluid, and adjusts the drilling fluid formula in time as the drilling progresses, specifically as follows:

[0037]1. Preparation before transformation. Drill the wellbore with a diameter of 215.9mm to 150m before the collapsible mud shale, adjust the performance of the drilling fluid, adjust the content of bentonite in the drilling fluid to 20-30g / L, and the viscosity and shear force of the drilling fluid are higher than those of conventional drilling The performance of the drilling fluid is reduced by 10% to 20%, and the performance of other related drilling fluids does not need to be adjusted, so that the density of the drilling fluid can meet the formation pressure and wellbore safety requirements.

[0038] Several commonly used methods to adjust the content of bentonite: concentration dilution method, such as adding water evenly into the drilling fluid to gradually reduce the conte...

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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...

Claims

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Application Information

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IPC IPC(8): E21B7/00E21B21/06
Inventor 王学军徐国良陈波苟天华梁鼎樊继强蒋官澄陈军
Owner SINOPEC SSC
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