Retrievable Jet Pump Assembly for Reverse Flow Oil Well Operations
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Solution Overview
Problem
Existing jet pump assemblies cannot be installed in reverse flow mode and subsequently removed from the tubular string without the use of a wireline, necessitating complex and costly operations.
Innovation Solution
A tool is designed to release locking dogs and attach to a fishing neck on the pump assembly, allowing the entire jet pump assembly to be removed as a unit by pumping it out, utilizing seals to engage the tubular string and facilitate removal without a wireline or workover rig.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If locking dogs are used to hold the pump assembly in reverse flow mode, then the pump can be securely positioned for operation, but the pump cannot be removed without complex wireline operations
Solution Approach 1:
A retrieval tool acts as an intermediary device that couples to the fishing neck and engages the locking dogs, enabling the pump assembly to be retrieved without wireline operations. The tool mediates between the pump assembly's locking mechanism and the conventional pumping equipment.
Solution Approach 2:
The locking dogs are designed to be pivotable between a locked position (engaging the annular pocket for secure positioning) and an unlocked position (allowing removal). This dynamic mechanism enables the system to transition between secure operation mode and easy retrieval mode.
2Stability of the object's composition
If a stop mechanism with dogs and annular pocket is used to prevent unintended pump back, then the pump remains securely in position, but removal requires conventional tools and wireline operations
Solution Approach 1:
The retrieval tool serves as an intermediary that simplifies the removal process by coupling to the fishing neck and disengaging the locking dogs, converting a complex wireline operation into a simple pumping operation.
Solution Approach 2:
The fishing neck provides a universal coupling interface that works with both the stop mechanism during operation and the retrieval tool during removal, enabling the same structure to serve multiple functions without requiring separate specialized equipment.
3Adaptability or versatility
If the pump assembly is designed with internal locking mechanism, then the pump can operate in reverse flow mode, but the entire assembly cannot be easily removed as a unit
Solution Approach 1:
The retrieval tool acts as an intermediary device that enables the entire pump assembly to be removed as a unit by coupling to the fishing neck and engaging the locking dogs, eliminating the need for complex disassembly or wireline operations.
Solution Approach 2:
The locking dogs are designed to be pivotable, allowing them to hold the assembly securely during reverse flow operation and be easily disengaged by the retrieval tool when removal is needed, enabling dynamic transition between operational states.
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
Enables the complete removal and reconfiguration of the jet pump assembly in reverse flow mode without a wireline, simplifying maintenance and operation, and reducing operational complexity and costs.
Implementation Method 1
The tool includes seals that engage the interior surface of the tubular string to facilitate the pumping out of the entire pump assembly
Implementation Method 2
Pumps of this type utilize a nozzle and a venturi tube to create a pressure drop which can draw fluid from a location in the well below the pump
Implementation Method 3
Pumps of this type utilize a nozzle and a venturi tube to create a pressure drop
Implementation Method 4
The power fluid and produced fluid from the well are then comingled in a mixing tube and diffuser where the pressure is increased to a point where the power and produced fluids are forced to the surface
Data Source
AI summary
A jet pump assembly is adapted to be releasably attached to a tubular member of a tubular string in an oil well. The jet pump may be pumped out of the tubular string to the surface by a reverse flow of power fluid down the well between the tubular string and the casing of the well. Consequently the jet pump may be serviced or reconfigured to a direct pumping mode without the necessity of a wire line or other apparatus. A sensor for measuring downhole parameters such as temperature and pressure etc. is positioned within a cavity located in a lower portion of the jet pump so as to be removable from the well with the pump.