Technology Research And Application On Wall Protection And Leaking Stoppage In Complex Formation Drilling

The problems of wall protection and leaking stoppage in the complex formation has been the subject of drilling projects needded to be resolved, which directly affects the development and utilization of mineral and energy supplies, for the current environment of energy scarcity, still has great practical significance.This paper mainly analyzed of the slurry wall protection and leaking stoppage material,at the same time for the requirement of wall protection and leaking stoppage in complex formation, and puted forward two kinds of slurry system which solute the breast wall and plugging problems.This paper firstly analyzes a lot of datas of protection and leaking stoppage in complex formation, and then put forward two kinds of slurry system, respectively, bentonite-polymer slurry system and clay cement slurry system. Analyzing the properties of two system slurry:bentonite polymer slurry system with coagulation function and dilution, loss reducing effect and wall building role, anti-sloughing effect, flocculation, retaining core role, shock and turbulent drag reduction effect; Clay cement slurry has good stability, adjustable Liquidity and setting time. Two kinds of slurry system of comprehensive performance can meet the requirements of wall protection and leaking stoppage in complex formation.Then through the indoor test, we analyzed the slurry performance and effect mechanismthe of main agent and additives in slurry, adopting the method of orthogonal test the optimization formula of slurry wall protection and leaking stoppage. Finally the wall-protection mortar polymer low solid mud was used for field test in coal measures, complex formation and achieved good results.In this paper, the main research results are as follows:1.Polymer low solid mud is a pseudoplastic fluid, with sloughing, fluid loss, heart care, vibration reduction, lubrication, inhibition of water sensitive stratum hydration properties of clay cement grout; belongs to Yield-Pseudoplastic fluid, slurry has good stability, adjustable fluidity and setting time. 2.We analyzed the mechanism of bentonite, vegetable gum and polyacrylamide and admixture of potassium humate,optimized the wall-protection mortar material component; and studied the principle of interaction of bentonite, cement,admixture water reducing agent and water glass, and optimized its plugging slurry composition.