Wellbore Heating and Gas Separation for Hydrate Control
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Solution Overview
Problem
The formation of gas hydrates in subsea wellbores poses a significant challenge for the oil and gas industry, causing flow blockages and costly maintenance, and downhole electrical submersible pumps are susceptible to damage from excess gas, leading to cavitation issues.
Innovation Solution
A system comprising a wellbore lined with a casing and production tubing, featuring an isolation sleeve and heating elements to separate and heat production fluids, reducing gas hydrate formation by transferring heat to the lower end of the wellbore and using a ported bushing sub and annular seal locator sub for gas separation and controlled release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If heat is added to the lower end of the wellbore to inhibit gas hydrate formation, then gas hydrate formation is reduced, but energy consumption increases
Solution Approach 1:
The patent combines the heating function with the production tubing by integrating heating elements directly into the tubing structure. This merging of functions allows heat to be transferred efficiently to the production fluids as they flow through the tubing, reducing gas hydrate formation without requiring separate heating equipment and minimizing additional energy consumption.
Solution Approach 2:
The patent changes the temperature parameter of the production fluids by heating them to prevent gas hydrate formation. The heating elements raise the fluid temperature above the hydrate formation point, fundamentally changing the thermal state of the fluids to eliminate the harmful effect of hydrate precipitation.
2Reliability
If gas is separated from production fluids before pumping, then pump damage from cavitation is prevented, but device complexity increases
Solution Approach 1:
The patent segments the wellbore into distinct zones using an isolation sleeve that creates separate flow paths. Gas is directed through one path while liquids are directed through another path to the pump. This segmentation allows gas-liquid separation without requiring complex external separation equipment, maintaining reliability while controlling device complexity.
Solution Approach 2:
The isolation sleeve acts as an intermediary device that facilitates gas-liquid separation. It introduces a structural element that redirects gas and liquid flows into separate pathways, enabling the pump to receive primarily liquid while gas is diverted away, thus preventing cavitation damage without complex separation machinery.
3Productivity
If production fluids are heated to reduce viscosity, then production rates increase, but energy consumption increases
Solution Approach 1:
The heating function is merged with the production tubing structure, allowing heat to be transferred directly to the production fluids during their flow through the tubing. This integration enables viscosity reduction and production rate enhancement without requiring separate heating equipment, thereby controlling additional energy consumption.
Solution Approach 2:
The patent changes the temperature parameter of the production fluids to reduce their viscosity. By heating the fluids, their flow properties are improved, enabling higher production rates. The temperature parameter is specifically adjusted to optimize the balance between viscosity reduction and energy consumption.
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
Effectively inhibits gas hydrate formation, reduces viscosity of production fluids, increases production rates, and prevents pump damage from cavitation by separating gas and heating the fluids, thereby enhancing wellbore operations and reducing maintenance costs.
Implementation Method 1
A pump may be adapted for transmission of heat to the production fluids in the inner space, thereby elevating the temperature of the production fluids
Implementation Method 2
The system may be configured for transferring heat carried by the production fluids to the lower end of the wellbore to reduce the formation of gas hydrates in the wellbore
Implementation Method 3
a heating element positioned to contact production fluids in the inner space
Data Source
AI summary
A system is provided that is capable of providing heat across a produced interval during oil and gas production to minimize or reduce undesirable formation of gas hydrates in the wellbore. In one embodiment, the configuration provides a means to recycle heat generated by an electrical submersible pump. Heat from the pump may be applied downhole. One configuration is capable of providing for downhole separation of gas from produced fluids to reduce or eliminate gas transit through the pump. A heating element also may apply heat to produced fluids. An orifice may apply heat to produced fluids. The wellbore being drilled to a depth having a subterranean formation temperature that is high enough to elevate a temperature of the production fluids to a predetermined temperature such that the temperature of the production fluids is elevated to the predetermined temperature by at least the depth of the wellbore.