Cement Composition Rapid Water Flow Termination
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Solution Overview
Problem
Conventional cementing compositions used for water control in oil and gas wells are slow to set and develop strength, making them ineffective in rapidly terminating unwanted water flow through small openings and fractures in subterranean formations.
Innovation Solution
A cement composition comprising calcium aluminate cement, Portland cement, and a non-aqueous carrier fluid, which forms a viscous gel upon contact with water, setting into a hardened mass with high compressive strength within a short period, typically less than 30 minutes, and remaining stable for at least 2 months.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional diesel oil cements are used, then the cement can seal holes and cracks in casing and cement sheath, but the setting time is considerable and strength development is slow
Solution Approach 1:
The patent changes the chemical composition parameters of the cement by incorporating calcium aluminate cement (providing rapid early strength) combined with Portland cement and Class G cement. This parameter change enables the cement to set rapidly (within 30 minutes) while maintaining effective sealing properties in high-pressure, high-temperature well environments.
Solution Approach 2:
The invention uses a composite cement system combining three different cement types (calcium aluminate, Portland, and Class G) with specific weight ratios. This composite material approach leverages the rapid-setting properties of calcium aluminate cement while maintaining the durability and sealing effectiveness of the combined system, resolving the contradiction between fast setting and reliable sealing.
2Reliability
If conventional diesel oil cements are used, then the cement can plug perforations and fractures, but the strength development takes considerable time
Solution Approach 1:
The patent modifies the chemical composition to include calcium aluminate cement which provides rapid early strength development. This parameter change enables the cement to achieve sufficient strength within 30 minutes to effectively plug perforations and fractures, eliminating the time delay associated with conventional cements.
Solution Approach 2:
The cement composition is designed to perform preliminary action by rapidly setting and developing strength at the plugging location before other operations need to occur. The fast-acting calcium aluminate cement component ensures that plugging effectiveness is achieved immediately upon contact with formation fluids.
3Loss of time
If rapid-setting cement is used, then the setting time is reduced, but the compressive strength may be compromised
Solution Approach 1:
The patent employs a composite cement system where calcium aluminate cement provides rapid early strength development within 30 minutes, while Portland cement and Class G cement contribute to ultimate compressive strength. This composite approach achieves both rapid setting and high compressive strength (exceeding 1000 psi at 28 days), resolving the contradiction between speed and strength.
Solution Approach 2:
The invention optimizes the weight ratio parameters of the composite cement (calcium aluminate: Portland: Class G in ranges of 70-90:5-15:0-10) to balance rapid setting with ultimate strength development. This parameter optimization ensures that the rapid-setting property does not compromise the final compressive strength required for well integrity.
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 composition achieves rapid gelation and high compressive strength development, effectively terminating water flow and supporting well structure, outperforming existing products by providing immediate and durable sealing in subterranean formations.
Implementation Method 1
These cements take considerable time to set and develop strength... upon contact with water, immediately form a viscous gel, which then sets into a hardened mass
Implementation Method 2
upon contact with water, immediately form a viscous gel, which then sets into a hardened mass
Implementation Method 3
calcium aluminate cement and Portland cement as active components... upon contact with water, immediately form a viscous gel, which then sets into a hardened mass with high compressive strength
Data Source
AI summary
Compositions and methods for terminating water flow in a subterranean formation are described. The compositions include a calcium aluminate cement, a Portland cement, a non-aqueous carrier fluid, and a polyphosphate. The cement compositions, upon making contact with water, form a viscous gel that sets into a hardened mass with extraordinary compressive strengths in a short period of time.