Polymer Tackifier for High-Temperature Drilling Fluids
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Solution Overview
Problem
Existing polymer tackifiers for solid-free drilling fluids lack compatibility with high-temperature and high-calcium environments, failing to maintain viscosity-increasing performance and ensuring suspension in such conditions.
Innovation Solution
A polymer with a structural unit containing a sulfonic acid group and another structural unit with a —C(A1COOH)(A2COOH)(A3COOH) group, integrated into an acrylamide skeleton structure, is developed to enhance temperature and calcium resistance, ensuring effective viscosity maintenance in high-temperature and high-calcium environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If existing polymer tackifiers are used to achieve temperature resistance (150°C-165°C), then temperature resistance is improved, but calcium resistance cannot be ensured in high-calcium environments
Solution Approach 1:
The patent applies composite material principle by creating a polymer containing multiple functional structural units: acrylamide skeleton units (formula 1), sulfonic acid group units (formula 2), and tricarboxylic propane units (formula 3). This composite structure combines temperature resistance from the acrylamide backbone with calcium resistance from the sulfonic acid and carboxyl groups, resolving the contradiction between temperature and calcium resistance.
Solution Approach 2:
The patent applies local quality principle by introducing specific functional groups at particular positions within the polymer structure. The sulfonic acid groups (formula 2) and tricarboxylic propane units (formula 3) are incorporated as specific structural components within the acrylamide skeleton, providing localized calcium resistance while maintaining overall temperature resistance of the polymer system.
2Ease of manufacture
If polymer structure is simplified for ease of manufacture, then manufacturing ease is improved, but performance in high-temperature and high-calcium environments deteriorates
Solution Approach 1:
The patent applies parameter changes principle by optimizing the molar ratios of monomers (formula 1), (formula B), and (formula C) within specific ranges. This allows control over polymer performance parameters while maintaining a relatively simple synthesis process using conventional polymerization methods, balancing manufacturing ease with high-temperature and high-calcium environment performance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The polymer maintains excellent viscosity-increasing performance even after aging for 16 hours at 180°C with a calcium ion concentration of 15000 mg/L, effectively serving as a tackifier for solid-free drilling fluids in harsh geological formations.
Implementation Method 1
polymer molecules in the drilling fluid system are mutually entangled to form a space grid structure, and thus cuttings are carried and suspend to be finally removed out of a well
Implementation Method 2
The polymer maintains excellent viscosity-increasing performance even after aging for 16 hours at 180°C with a calcium ion concentration of 15000 mg/L
Implementation Method 3
a polymer with a structural unit containing a sulfonic acid group and another structural unit with a —C(A1COOH)(A2COOH)(A3COOH) group, integrated into an acrylamide skeleton structure, is developed to enhance temperature and calcium resistance
Data Source
AI summary
Disclosed are a polymer, a tackifier, a preparation method therefor and a drilling fluid. The polymer contains a structural unit represented by a formula (1), a structural unit represented by a formula (2) and a structural unit represented by a formula (3), wherein R1, R2, R3, R4, R5, R6, R7 and R8 are each independently hydrogen or C1 to C10 linear or branched alkyl; X is C1 to C10 linear or branched alkylene; Y is a formula (4) or C1 to C10 linear or branched alkylene; and M is hydrogen or an alkali metal, and A1, A2 and A3 are each independently a bond or C1 to C3 linear or branched alkylene. The polymer can still maintain excellent viscosity-increasing performance in a high-temperature and high-calcium environment.