Cement Slurry Early-Strength Composition for Temperature-Dependent Setting
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Solution Overview
Problem
Existing cement slurry systems face issues with short thickening time under high temperature, ultra-retarding under low temperature, low early strength, and adverse effects on rheological properties, particularly in deep and ultra-deep wells with long isolation sections.
Innovation Solution
A cement slurry system comprising an aluminum salt, sodium salt, crystal whisker, inorganic mineral, and dispersing agent, with specific weight ratios, to achieve high-temperature retarding and low-temperature early strength performance, adjusting rheological properties, and extending thickening time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional early strength material is added to expedite top set cement strength development, then early strength is improved, but thickening time is seriously shortened under high temperature
Solution Approach 1:
The patent changes the chemical composition parameters of the early strength material by using specific inorganic salts (sodium formate, ammonium formate, oxalic acid) in controlled amounts (0.1-5% by weight) rather than conventional chlorine salts, thereby achieving early strength enhancement without excessive thickening time reduction under high temperature conditions
Solution Approach 2:
The patent creates a composite early strength material system combining multiple inorganic salts (sodium formate, ammonium formate, oxalic acid) and inorganic minerals (calcium carbonate, barium sulfate, talc) in specific proportions, which works synergistically to provide early strength while controlling thickening time under high temperature
2Strength
If chlorine-salt-containing composite material is used as early strength material, then early strength effect is achieved, but high-temperature strength decline of set cement is caused
Solution Approach 1:
The patent extracts and removes the harmful chlorine salt component from conventional early strength materials and replaces it with non-chlorine inorganic salts (sodium formate, ammonium formate, oxalic acid), thereby eliminating the cause of high-temperature strength decline while preserving early strength enhancement
Solution Approach 2:
The patent converts the potentially harmful effect of high-temperature retardation into a beneficial controlled setting process by using inorganic minerals (calcium carbonate, barium sulfate, talc) that provide moderate retardation and early strength without the detrimental chlorine salt effects
3Strength
If ultrafine mineral material is used as early strength material, then early strength effect is achieved, but ash discharge time is influenced and cement slurry thickening curve bulges and raises steps
Solution Approach 1:
The patent changes the particle size and composition parameters by using inorganic minerals with controlled fineness (calcium carbonate, barium sulfate, talc) instead of ultrafine minerals, thereby maintaining early strength effect while preventing thickening curve bulging and step-rising caused by excessive ash discharge
4Strength
If conventional early strength material is added to long isolation section cementing, then early strength effect is achieved, but thickening time is shortened and retarder addition amount is increased
Solution Approach 1:
The patent merges the early strength enhancement function and the thickening time control function into a single integrated early strength material composition, eliminating the need for separate retarder addition and simplifying the cement slurry system while achieving both early strength and controlled thickening time
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 system effectively prolongs thickening time under high temperature, prevents ultra-retarding under low temperature, and maintains desirable rheological properties, ensuring high-quality well cementation in deep and ultra-deep wells with long isolation sections.
Implementation Method 1
containing an aluminum salt, a sodium salt, a crystal whisker, an inorganic mineral, and a dispersing agent I
Implementation Method 2
the early strength material has both high-temperature retarding performance and low-temperature early strength performance
Implementation Method 3
a dispersing agent I; wherein the weight ratio of the aluminum salt, the sodium salt, the crystal whisker, the inorganic mineral and the dispersing agent I is (1-3):(1-3):(1-4):(1-8):1
Data Source
AI summary
The present disclosure relates to the technical field of oil and gas field exploitation, in particular to an early strength material suitable for a cement slurry system, a cement slurry composition, a cement slurry system, a preparation method therefor and the use thereof. The early strength material contains an aluminum salt, a sodium salt, crystal whiskers, an inorganic mineral and dispersing agent I, wherein the weight ratio of the aluminum salt, the sodium salt, the crystal whiskers, the inorganic mineral and dispersing agent I is (1-3):(1-3):(1-4):(1-8):1. The early strength material provided by the present invention has both high-temperature retarding performance and low-temperature early strength performance; meanwhile, while satisfying well cementing, the cement slurry system prepared from the cement slurry composition containing the early strength material can prolong thickening time of cement slurry under a high-temperature condition, can prevent ultra-retarding of top cement slurry under a low-temperature condition and has increased early strength.