Delayed Cross-Linking Fluid for Oil Well Casing Insulation
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Solution Overview
Problem
Current methods for thermal insulation and consolidation of oil drill wells are inefficient, leading to prolonged drilling and casing operations due to difficulties in mixing and gelling of materials at the right location and time, resulting in high costs and productivity issues.
Innovation Solution
A cross-linkable composition with controlled, preferably delayed cross-linking, comprising diene polyol, polyisocyanate, and a thermally insulating liquid filler, which can be injected into the well and forms a moldable insulating gel, adapting to varying temperatures and pressures, and cross-links to fix and insulate the casing sections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional dual casing method with separate cementing and insulating fluid injection is used, then thermal insulation and consolidation are achieved, but drilling and casing operations are prolonged and costs increase
Solution Approach 1:
The patent combines the cementing and thermal insulation functions into a single integrated operation by injecting a dual-purpose composition that performs both consolidation and insulation simultaneously, eliminating the need for separate cementing and insulating fluid injection steps
Solution Approach 2:
The composition used in the patent serves multiple functions: it acts as both cement for consolidation and as thermal insulation material, making a single substance perform the roles of two separate materials traditionally used in dual casing operations
2Reliability
If insulating fluid is injected into the annular space to fill the space between tubes, then thermal insulation is provided, but the fluid must gel or solidify which prolongs the operation time
Solution Approach 1:
The patent modifies the chemical composition parameters of the insulating fluid by incorporating specific polymers and cross-linking agents that enable controlled gelation, allowing the material to transition from liquid to gel state under controlled conditions without excessive delay
3Reliability
If conventional materials are used for thermal insulation, then insulation is provided, but mixing and gelling difficulties occur at the right location and time
Solution Approach 1:
The patent introduces a cross-linking agent as an intermediary substance that facilitates controlled gelation of the insulating composition at the desired location and time, acting as a mediator between the liquid polymer components and the final gel structure
Solution Approach 2:
The patent adjusts the chemical parameters of the composition including polymer molecular weight, cross-linking agent concentration, and catalyst amounts to optimize the mixing and gelling behavior, ensuring proper consistency and timing for effective insulation
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
This solution accelerates the drilling rate by reducing the number of steps required for forming the insulation gel, provides better thermal insulation, reduces handling costs, and results in more solid and flexible well structures with reduced risk of fractures and heat conductivity.
Implementation Method 1
a cross-linkable composition with controlled, preferably delayed cross-linking, comprising diene polyol, polyisocyanate, and a thermally insulating liquid filler, which can be injected into the well and forms a moldable insulating gel
Implementation Method 2
This solution accelerates the drilling rate by reducing the number of steps required for forming the insulation gel, provides better thermal insulation
Data Source
AI summary
A cross-linkable composition with controlled cross-linking as a material is used for fixing and thermally insulating tubes used for casing in drill holes, especially oil drill holes, during exploitation operations, such as oil extraction, in the drill hole. The cross-linkable composition includes at least one diene polyol, at least one polyisocyanate, and at least one heat insulating liquid filler.