Jet Claw Pump SystemsWed, 01/25/2012 - 11:20
Jet Claw Pump systems provide artificial lift to aid oil production whilst optionally providing information on the field through electronic sensors embedded into the pump systems. The dierent types of pumps under Sertecpet’s Jet Claw brand oer various solutions to dierent technological challenges.
The standard Jet Claw pump does not feature electronic sensors, but acts as a direct pump to aid artificial lift. The pump is based on the Venturi principle, which consists of the passage of a fluid through a reduced area in which a change from potential to kinetic energy takes place at the nozzle outlet, causing suction of formation fluid. These fluids enter a constant area called the throat, in which the mixture of fluids undergoes a change from kinetic to potential energy at the entrance to an expanded area called the diuser, where the potential energy is responsible for carrying the fluid up to the surface. The conventional Jet Claw pump is particularly useful in wells that have deteriorating casing, since the return pressure through the annular space is low compared to other pumps. The conventional pump is commonly used for continuous well production. It is housed in a sliding sleeve or cavity, and is deployed and retrieved hydraulically.
Sertecpet’s reverse Jet Claw pump is often used in exploratory wells, sanded wells and for recovery of acids and solvents in treated wells. It is frequently employed to obtain immediate oil reservoir data, since all that is needed is to displace the fluids in the production tubing to obtain a formation fluid sample. The pump is housed in a sliding sleeve and is rapidly and eectively deployed and retrieved with a slickline through the tubing.
Sensors are employed in the so-called smart Jet Claw pump, which is often employed in exploratory wells, developing wells or production wells for well testing and evaluation. This type of pump comes with a special downhole cuto valve, which eliminates the wellbore storage eect, thus optimizing pressure buildup testing. The electronic sensors precisely record downhole pressure and temperature changes when conducting dierent pressure tests, and enable multiple flows and well shutos. Samplers may also be placed to do PVT analysis.
The downhole pressure and temperature recording sensors inside Jet Claw pumps operate with intelligent batteries and have an interface unit for programming and testing. High-tech memory development enables storage of 1,400,000 pressure and/or temperature data points. The pressure range is up to 10,000 psi (7.03 million kg/m2), and the gauges can withstand temperatures of up to 149°C. These devices are programmed in standard or advanced mode, and their simple calibration and maintenance procedures save time, thus helping to reduce operating costs. The sensors are fitted into Jet Claw pumps and can be lowered into oil wells under severe flow conditions. The data obtained by the memory gauges is used by reservoir engineers when evaluating well and field behaviour. The data gathered includes the productivity index, permeability, boundaries, well interference, and damage to the oilfield (i.e. formation damage, partial penetration, total amount of damage).
In order to take advantage of the information gathered by the Jet Claw pump’s sensors and use it to increase productivity, Sertecpet designed a real time monitoring system to monitor the parameters for surface pressure temperature and the rate of flow of oil, gas, and water produced by the Jet Claw pump. The system also monitors well parameters such as flowing pressure and temperatures at the depth where the sensor is positioned; allowing users to monitor and acquire data from dierent pressure tests such as build up, draw down, and fall o, with a precision quartz sensor. The parameters recorded for surface and depth are sent in real time, feeding into users’ SCADA systems, or by sending data by satellite communications anywhere in the world.