Swelling Material Latch for Automatic Mud Flow Back Valve Closure
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Solution Overview
Problem
Previous downhole valves using swelling materials as differential pressure seals face reliability issues due to softening, which compromises their ability to withstand pressures over time, especially when exposed to well fluids, leading to potential clogging of production screens during the transition from drilling mud to production fluids.
Innovation Solution
A sliding sleeve valve mechanism utilizing a swelling material responsive to produced hydrocarbons to release a latch, allowing stored energy to shift the sleeve and straddle a port, effectively directing production fluids through screens while preventing drilling mud from clogging them.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If swelling material is used to block fluid passageway, then flow barrier capability is improved, but material strength deteriorates when exposed to well fluids
Solution Approach 1:
The patent converts the harmful softening effect of swelling material exposure into a beneficial latch-release mechanism. When produced hydrocarbons cause the material to soften, it releases the collet latch, which then allows the spring to close the bypass port. This transforms the material weakness into the triggering mechanism for the desired valve closure action.
2Productivity
If bypass port is open to displace drilling mud, then mud circulation is improved, but production screens are at risk of clogging
Solution Approach 1:
The bypass port is kept open during the preliminary mud circulation phase to allow efficient displacement of drilling mud. Once produced fluids enter the system and trigger the swelling material softening, the port automatically closes, preventing screens from clogging during the production phase. This preliminary open-state action enables safe mud circulation before the protective closure occurs.
3Ease of operation
If collet latch is used to hold sliding sleeve, then valve positioning is improved, but reliability deteriorates when exposed to produced hydrocarbons
Solution Approach 1:
The patent utilizes parameter changes in the swelling material's physical properties when exposed to produced hydrocarbons. The material transitions from a rigid, latch-retaining state to a softened, latch-releasing state. This parameter change transforms the collet latch from a permanent restraint into a temporary holding mechanism that automatically releases under the right chemical conditions, ensuring reliable timing-dependent operation.
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 solution ensures reliable and automatic transition from drilling mud circulation to production fluid flow through screens, minimizing the risk of clogging by using the softening of the swelling material to unlock the collet mechanism and redirect fluid flow, ensuring efficient operation over time.
Implementation Method 1
a sliding sleeve valve is held away from a circulating port to allow drilling mud to be circulated out. Later, when the well is put on production, the lock that holds collets in a groove releases as exposure to produced hydrocarbons at a retaining sleeve makes it get soft.
Data Source
AI summary
A material that reacts to produced hydrocarbons acts as a latch to retain a stored potential energy force. In a specific application, a sliding sleeve valve is held away from a circulating port to allow drilling mud to be circulated out. Later, when the well is put on production, the lock that holds collets in a groove releases as exposure to produced hydrocarbons at a retaining sleeve makes it get soft. This, in turn, allows a spring force to run the collets out of their groove and straddle the circulation port between two o-rings on the shifting sleeve to close the port. The closure of the port directs produced hydrocarbons to screens that had been bypassed when mud was circulated out due to ports being the path of least resistance.