What Is Gas Well Dewatering
Gas Well Dewatering,” or “Gas Well Deliquification” (GWD), is the general term for technologies used to remove water build-up (hydrostatic head) from producing gas wells. When natural gas flows to the surface in a producing gas well, the high velocity of the gas carries liquids to the surface in a mist flow pattern. As the gas velocity in the production tubing drops with time, the velocity of the liquids carried by the gas declines even faster. Eventually, the hydrostatic head accumulates in the bottom of the well. This condition can either slow or kill gas production altogether.
THE JJ TECH GWD SOLUTION
By utilizing the efficient JJ Tech Jet Pump with concentric tubing strings, formation fluids are produced up the inner annulus and the gas up the outer casing and tubing annulus. This method allows the gas production to achieve a constant, steady production rate.
ADVANTAGES OF JJ TECH GWD SOLUTION
• No moving parts downhole.
• Large volumes of fluid moved with moderate to high solid (sand) content.
• Increased production rates as hydrostatic head is reduced.
• Increased recoverable reserves as more gas can move into the well bore.
• Proprietary software provides formation monitoring and performance optimization.
HOW THE SOLUTION WORKS
The JJ Tech Jet Pump utilizes the Venturi effect to pull wellbore fluids into a flow stream that is pumped downhole and back up again through a CT string or a tubing-annular configuration. In either case, the key components of the jet pump assembly are flow-reversible and, therefore, do not require a service rig intervention to be retrieved, inspected, serviced or changed. Pump component change-outs are one-man operations that require only one to two hours to perform. The jet pump can be run on the end integral joint or coiled tubing inside of standard production tubing.
The improved, patented JJ Tech Jet Pump design uses larger fluid input areas and cleaner flow geometries, allowing operation with efficiencies equivalent to or greater than conventional artificial lift systems. These features also facilitate the movement of solids, i.e. sand through the jet pump, making it ideal for production with high solid content.
JJ Tech’s Jet Pump is the downhole component of the company’s patented ULTRA-FLO ™ production system. It is combined with a T80 series high pressure diaphragm surface pump, developed for JJ Tech by Wanner Engineering, Inc. This rugged, reliable pump greatly reduces environmental and maintenance issues associated with conventional triplex pumps. The T8030, rated at 5000 psi and 905 bbls/day, is well-suited for concentric string completions used with gas well dewatering, where smaller fluid conduits require higher pressures due to fluid friction through the smaller strings of pipe.
The Wanner surface pumps are closed systems with cartridge-type check valves and diaphragms for ease of maintenance and lower operating costs. Units are configured with natural gas engines or electric motors with variable-frequency drives (VFD’s) to reduce operating costs and pump wear.