Polymer Design for Cement Slurry Fluid Loss Control
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Solution Overview
Problem
The oilfield industry faces challenges in maintaining satisfactory slurry performance during cementing operations due to variability in fluid loss control additives, which affects mixability and mechanical properties of the cement, leading to issues like excessive density increase and annulus bridging, contributing to primary cementing failures.
Innovation Solution
Developing methods to identify and correlate polymer properties such as polydispersity index, radius of gyration, and molecular weight with performance characteristics to design treatment fluids that balance fluid loss and mixability, using models like ln(FL)=A+B*PDI+C*Rg+D[CONC]+E*Mw to optimize polymer specifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If polymeric fluid loss control additives are used to reduce fluid loss, then fluid loss control is improved, but variability in polymer properties affects mixability and slurry performance
Solution Approach 1:
The patent applies parameter changes by establishing specific numerical ranges for polymer properties including molecular weight (10,000-1,000,000 Daltons), polydispersity index (1.0-5.0), and concentration (0.1-5.0 lbm/bbl). These parameter specifications transform the variable polymer properties into controlled parameters with defined acceptable ranges, ensuring consistent slurry performance while maintaining fluid loss control.
2Loss of substance
If polymer concentration is increased to improve fluid loss control, then fluid loss reduction is enhanced, but mixability and rheology may be adversely affected
Solution Approach 1:
The patent resolves this contradiction by defining an optimal parameter range for polymer concentration (0.1-5.0 lbm/bbl) and molecular weight (10,000-1,000,000 Daltons). Within these parameter boundaries, the polymer achieves effective fluid loss control while maintaining acceptable mixability and rheological properties. The specified polydispersity index range (1.0-5.0) further optimizes the balance between fluid loss reduction and mixability.
3Loss of substance
If polymer molecular weight is increased to improve fluid loss control, then fluid loss reduction is enhanced, but wetting time and mixability may be reduced
Solution Approach 1:
The patent addresses this contradiction by specifying a broad molecular weight range (10,000-1,000,000 Daltons) with corresponding polydispersity index constraints (1.0-5.0). This parameter specification allows selection of polymers with appropriate molecular weights for the specific application, balancing fluid loss control performance with acceptable wetting times and mixability characteristics.
Data Source
AI summary
A method of well treatment may include: providing a polymer; correlating performance of the polymer to a least one physical property of the polymer; and preparing a treatment fluid comprising the polymer.