Rota-Perf TM / Rota-JetTM Perforated Stator for Gas Control in PC Pumps Hollow Rotor for Controlling Solids Problems in PC Pumps
Gas Locked PC Pumps: PC pumps are a true positive displacement pump at zero head pressure At Zero differential pressure = best efficiencies Slippage = High diff press across seal lines, loose interference fit Gas locking? Why? Stages in a PC pump: What is a stage, and what does this mean?
PC Pump Stages: Stages in a PC pump A stage is one full seal line or cavity Each stage is isolated from the next by this seal line 1 stage = 3 major
Gas Locked PC Pumps Pump Pressure Loading How much pressure do we require to overcome the system? Why is PPL useful in designing PC pumps? Why do we need this for perforating a stator?
Gas Locked PC Pumps Gas Locking: Low fluid levels Changing inflow Pumped off System design No rathole Inlet landed above perfs 2 phase flow in low pressure horizontal wells
Gas Locked PC Pumps Pump failures Burnt stator How long does this take? Run dry Run in-efficiently Solids Abrasion Solids Rotating in cavity with no lubrication Velocity changing ( in cavity, at inlet, in tubing) Countless other failures How long does a failure take? Depends on many variables Bottom line is that it is in a failure state
Gas Locked PC Pumps What exactly happens inside the stator to gas lock: Media encounters pressure Gas is halted More gas = further loss in efficiency Elastomer heats up and burns stator No way to effectively release gas Cavitation also occurs Gas locking is not a brand specific problem
Gas Locked PC Pumps Perforating a Stator: Technology removes gas from stator Drilling holes: ½ hole in minor, and hardened insert First and second set of perforations Low pressure point in stator Lose 4% of flow through the stator perfs
Gas Locked PC Pumps Regular Stator Video Shortcut to Regular stator with gas february 2004.lnk Perforated stator video Shortcut to Perforated Stator video 2005.lnk
Solid Problems in PC Pumping Process, food services, industrial and down hole environments Each Application has unique characteristics Downhole environments produce a variety of solids Downhole troubles with solids low inlet velocities, low cavity velocities, low tubing velocities, solid slugs, in-efficient pump and gas dropping solids out at inlet.
Solids Velocities: We will review each problem and what causes them Low inlet velocities / Pc pumps create very little suction Low tubing velocities/occurs when pump has reduced efficiencies due to gas locking or plugged inlet Solids Slugging inflow characteristics change and solids are driven into wellbore at increased velocity and volume Low cavity velocities/gas locking or reduced efficiency
Rota-Jet TM Hollow Rotor: Constant pump discharge pressure Discharge pressure drives fluid through Orbit sub, down rotor and out jet nozzle. Pressure differential creates jetting Jetting = stimulation/agitation Formation or perforation wash Velocity change and pressure drop Jet nozzle controls flow 10-14 feet of agitation
Rota-Jet TM Hollow Rotor: The typical applications for a hollow rotor are wells with: High solid ratios and higher flow rates Lower solid ratios and lower flow rates Oil wells with solids Gas well dewatering Coal Bed Methane application
Rota-Jet TM Hollow Rotor: Operational issues Delta P is critical Startups with lots of solids Hollow rotor designs have four nozzle sizes Circulate % of production Higher Viscosity= less jetting Water= maximum jetting
Rota-Jet TM Hollow Rotor: Orbit Sub including screen Jet Nozzle Tag Bar Hollow rotor top end complete assembly
Rota-Perf / Rota-Jet Gas and solids in same environment Rota-Perf and Rota-Jet as one Technology applies to any manufacturers pc pumps Rota-Jet Hollow Rotor Video Shortcut to Hollow rotor circulating Emulsion.lnk Shortcut to Hollow rotor video summary.lnk
Case Histories: Husky 1D6-16 Frog Lake Rota-Jet Rota-Perf application Empire Resources C4-25 Lone Rock Rota-Perf Application Encana Oil and Gas Pelican Lake operations Rota-Perf applications
Case Histories: Cheyenne Energy: Camrose Area Husky Energy: Jenner Area Talisman Energy Chauvin Sask