Polymer drilling fluid with high temperature resistance

Abstract

The invention relates to a polymer drilling fluid with high temperature resistance, falling into the chemical agent technical field of petroleum drilling engineering. It is characterized in that the weight percentages of all components are clay: 2-4%; polymeric viscosifier: 0.3-0.8%; inhibitor: 0.3-0.5%; high-temperature resistant polymer fluid loss reducer: 0.3-0.5%; high temperature resistant sulfonated fluid loss reducer: 2-4%; lubricant 2-6%: PH regulator: 0.1-0.6%; weighting agent: 0-40%; temperature stability agent: 0.2-0.5%; and water for allowance. The inventive drilling fluid solves the problem of filter loss large increase caused by poor sand-carrying and sand suspending due to great change on rheological property of the drilling fluid under high temperature condition, so that the drilling fluid system keeps good rheological property and fluid loss property at high temperature to ensure drilling safety; and it has the characteristics of low filter loss, good inhibition, and good lubricity.

Description

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AI Technical Summary

Benefits of technology

This patented solution improves on existing methods by providing better control over properties such as viscosity or filterability during use at extreme temperatures while also maintaining excellent performance for long periods without losing its effectiveness due to degraded materials from oil production processes. It can be used even if there're no other options like water injection into an enclosed space where drilled holes may have different pressures caused by varying levels of heat.

Problems solved by technology

This patented technical solution describes different types of drill bits called bituminous materials (BMs). These BOM's have unique characteristics for use during drilling operations: they help protect against erosion from heating while still allowing them to flow freely through holes on their surface. They allow water to pass through without losing any material when needed. Additionally, these BOMs provide stability even after being exposed to extreme environments like high pressures. Overall, there has been an interest in developing efficient systems capable of controllably changing the physical state of drills based upon environmental factors like temperature and stress levels.

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