Delayed-Setting Resin Polymerization for Wellbore Liner Puddle Jobs
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Solution Overview
Problem
Cementing processes in wellbores face challenges such as high gel strength or premature setting, leading to incomplete cementing and potential liner collapse, especially in puddle jobs, due to the need for rapid operation or use of set retarders.
Innovation Solution
Employing a settable resin that remains in liquid form until activated by an activator, which initiates polymerization upon contact, allowing delayed setting and displacement into the annulus without the need for rapid liner installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cement is used in puddle jobs, then the wellbore can be sealed, but the cement may set prematurely or develop high gel strength causing incomplete cementing and liner collapse
Solution Approach 1:
The patent changes the chemical parameters of the sealing material by using resin monomers instead of cement, fundamentally altering the setting mechanism from hydration to polymerization. This allows control over gel strength development and setting time through selection of different monomers and activators, preventing premature setting and high gel strength issues associated with cement
Solution Approach 2:
The resin monomers are placed in the wellbore before the liner is set, allowing the material to remain in liquid form during liner installation. The polymerization reaction is then initiated after the liner is in place, ensuring the material has adequate time to flow and seal before setting, thereby preventing incomplete cementing and liner collapse
2Duration of action of moving object
If set retarders are used to delay cement setting, then the operation time is extended, but the gel strength may still become too high causing operational issues
Solution Approach 1:
The patent changes the fundamental chemical system from cement-based to resin-based, allowing independent control of viscosity and gel strength through monomer selection. The resin system maintains low gel strength throughout the operation time by using polymerization rather than hydration, eliminating the trade-off between operation time and gel strength that plagues cement with retarders
3Reliability
If rapid liner installation is performed, then premature setting is avoided, but the operation becomes rushed and may lead to errors
Solution Approach 1:
The resin monomers are placed in advance in liquid form, allowing the liner to be installed at a normal, careful pace without rushing. The material remains pumpable and flowable during installation, and only after the liner is properly positioned does the polymerization begin, eliminating the need for rushed operations while maintaining prevention of premature setting
Solution Approach 2:
The patent uses an activator as an intermediary to control the timing of the polymerization reaction. The activator is introduced after the liner is in place, serving as a mediator that delays the setting process until the optimal time, allowing operators to work at a steady pace without fear of premature setting
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
Ensures complete resin placement and securement of the liner, offering higher compressive strength, lower permeability, and resistance to failure under wellbore conditions, while avoiding the limitations of cement setting times and gel strength issues.
Implementation Method 1
the resin is in liquid form prior to being contacted with the activator, and after contact, the activator initiates polymerization causing the resin to set
Data Source
AI summary
A puddle job can be performed in a wellbore to secure a liner within an open-hole wellbore. A resin in liquid form can be spotted at the bottom of the wellbore. The liner can be lowered into the wellbore to displace the resin up into an annulus between the outside of the liner and the wellbore wall. The resin can be contacted with a solid or liquid activator to cause the resin to set. The activator can cause the resin to set via a polymerization reaction such as ROMP, FRP, or step polymerization. The resin can be contacted with the activator as the liner is being lowered or afterwards. The resin/activator can be used instead of a cement composition.