Solid phase-free drilling-in liquid

Abstract

The invention relates to solid phase-free drilling-in liquid, belonging to the technical field of petroleum drilling engineering chemical agents. The solid phase-free drilling-in liquid is characterized in that: the solid phase-free drilling-in liquid is formed by the following ingredients in percentage by weight: 0.5-1 percent of tackifier, 0.1-0.6 percent of pH regulator, 1-4 percent of fluid loss additive, 3-30 percent of inhibitor, 1-5 percent of lubricant and the balance of sea water. The drilling-in liquid has dual biological and chemical degradation functions, has high viscosity and can meet the requirements of a horizontal well, and particularly a large-displacement horizontal well on the viscosity of low shearing rate; the drilling-in liquid is the solid phase-free drilling-in liquid and does not contain solid phase, the metal ion invading resisting capacity is strong, the shale inhibition is strong, the lubrication is high, the system performance is stable, the maintenance and usage are convenient, thereby having better oil-gas layer protecting effect; the oil field exploitation efficiency can be improved and the normal exploitation life of the oil field can be prolonged.

Description

Technical field: [0001] The invention relates to a solid-phase-free drilling fluid, which belongs to the technical field of petroleum drilling engineering chemical agents. 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. Its main functions are to carry and suspend cuttings, stabilize the well wall and balance formation pressure, cool and lubricate drilling tools, Transmitting hydrodynamic forces and protecting oil and gas layers are important components of drilling engineering technology. During the drilling construction process, the drilling fluid needs to have good colloidal stability in order to have sufficient viscosity to suspend cuttings. At present, the water-based drilling fluid system is composed of water, clay and various chemical treatment agents. Under the action of water, the clay is dispersed into colloi...

AI Technical Summary

Problems solved by technology

When the existing drilling fluid and completion fluid system is used for operation, there are still some technical problems and shortcomings, including easy wall collapse, serious mudstone slurries, serious leakage of shale shaker drilling fluid, and poor formation diagenesis , solid particles invade the formation and cause serious reservoir pollution, etc.