The April issue of the "World Petroleum" magazine introduced the improvements and innovations of five Screw pump accessory equipment and instruments developed by the two companies in the United States and Canada: the screw pump drive system for dehydration of gas wells, the hydraulic transmission brakes, the change of screw pump speed Liquid level controller, new software to simulate the flow loop and screw pump for downhole pumping conditions. Screw Pump Drive System for Gas Well Dewatering Denver Hydro Energy Inc. of the United States recently developed a ternary drive system that automatically removes water from gas wells, especially coalbed methane wells. The entire system can be monitored and adjusted on its own, and an alarm will be issued if the drive speed is above or below a predetermined value. The system uses a top drive head and a hydraulic brake to achieve manual variable speed control. HEP (Hydraulic Energy Products) Top Drive Head The direct drive hydraulic motor drive has a total of 4 torque ranges and is connected to a polished 11/4 inch polished rod using a common friction block. The largest hydraulic motor at a depth of 1524 meters is capable of supporting 2000 barrels of tubing and water column (barrel) and 4000 barrels (barrel of water) of tubing and water column at a depth of 610 meters. This kind of drive device does not need the maintenance, can change the ordinary packing box through a rotary joint. Full control of "reverse" by hydraulic brakes, with two larger sizes. Safety brakes release or dissipate stored energy. The drive can be equipped with a threaded reducer, connecting the oil tee or fixed to the API standard 8-bolt flange. At present, there are 12 top drive head put into use, the longest has been using more than two years without fault. HEP Hydraulics Brakes HEP hydraulically actuated brakes come with a natural gas powered 2.5 or 4.0-1 engine or a 460 V motor with over 100 horsepower. The HEP design combines the secondary volume of the entire flow with the enclosure that prevents water buildup. The variable volume hydraulic pump is controlled by electric equilibrium and the feedback circuit is used to determine the accuracy and capacity / working pressure efficiency. Use a marine computer to optimize fuel mix and adjust operating speed. The computer also monitors engine oil pressure, radiator temperature, hydraulic fluid level and temperature. The brake can be used to limit the button torque and speed reversal of the drive head to consume energy, fill the screw pump or quickly balance the liquid level. Constant-speed motor drive system with variable top drive head drive speed, eliminating the need for variable-frequency drives. Level Controller The patented Energy Application Product Controller, which calibrates and changes the drive speed of a downhole screw pump by calculating actual well data and formation velocity to maintain a preset level. The level controller has two separate computers. The first computer gathers information or monitors changes in formation water flow into the well casing. The second computer analyzes and signals the signal, adjusts the current to the drive motor, and changes the speed of the downhole screw pump. The level controller maintains the level of liquid between the lowest perforation levels or the user-defined level and the inlet of the screw pump that maximizes gas production. This level controller can be used to manually control the speed and if the operating range exceeds a predetermined value, the monitoring and data acquisition system signals. The level controller has been installed at the well, but it has not been massively introduced to the market yet. Flow Loop Simulation Experimental CETER Technologies, Inc., of Exton, Calif., Recently tested the flow loop simulating the downhole conditions of a screw pump during steam gravity flooding. The pumping equipment with a length of more than 24.4 meters can be tested with a maximum discharge pressure of 7.58 MPa, a wellhead temperature of 200 ° C and a flow rate of 800 m3 / d. The flow loop is multiphase (oil, water, gas) and equipped with all the instruments to measure all major variable parameters (pressure, temperature, flow, pump speed, torque, etc.) in real time. Therefore, the flow loop is an ideal tool for determining the performance of a new artificial lift system under controlled conditions prior to the actual field test. Screw Pump Human-Computer Interaction Software Recently, C-FER Technology Services Inc. of Edmonton, Canada introduced the latest upgrade of dedicated software for screw machine HCI design and evaluation (2.67). The updated software includes: the latest instrument database (pump, sucker rod, drive head, etc.) provided by the manufacturer; the improved wellbore temperature gradient and bottomhole flow and yield calculations and the improved batch comparison mode Simplifies evaluation beyond the scope of the operating conditions.
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