Technical Description and Specifications of the VibraEnforcer Systems for Freeing Stuck Pipe in Drilling Operations

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Morgan Allen
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1 Introduction Technical Description and Specifications of the VibraEnforcer Systems for Freeing Stuck Pipe in Drilling Operations Nordic Well Services and Advanced Drilling Support Services (ADSS) has identified a major requirement in the oil and gas drilling industry for the provision of a surface operated oscillation system to free stuck drillpipe and casing. The initial objective, of applying Surface Oscillation Units techniques to our industry, was to overcome some of the many issues surrounding freeing stuck pipe such as cost, number of loads, excessive crew sizes and environmental impact. The application of Surface Oscillation Units offers many benefits to the drilling and work over process. The very high costs and safety issues associated with applying conventional techniques has resulted in a certain degree renewed interest in searching for new and simplified solutions to some of the work over requirements. Main Benefits of VibraEnforcer Unit Simplified equipment Reduced number of crews Cost effective Increased well up time These first four reasons commonly sited as THE reason for considering using Oscillation Units and any other benefits are secondary. The secondary benefits of Oscillation Units include: Reduces drilling costs. Accelerates production In 1997 a Joint Industrial Project was formed between Statoil, Norsk Hydro, Shell International and Rogaland Research to develop technology to reduce friction and free stuck objects in the wellbore This led to the concept of reducing friction between drillstring and casing / open hole by introducing axial oscillations to the drill string. From 2000 throughout 2002 Nordic Well Services in conjunction with Rogaland Research Institution developed the following tools and systems:

2 Thru-Tubing and Drilling System 1. VibraHammer - for fishing of stuck pipe or objects with oscillations. 2. VibraBlaster - Oscillations are used to break down scale and liquidize settled out mud and debris 3. VibraReach - reducing friction in wellbores and extending the reach of the drillstring Surface Oscillation System 1. VibraEnforcer - for recovery of stuck pipe or casing in Drilling Operations The VibraEnforcer The VIBRAENFORCER SYSTEM generates controlled axial oscillations in the drill string from the rig floor. The system consists of vibration compensation cylinders, flow control valve and an oscillation generator. The system is activated through hydraulic flow rate manipulation controlled by the operator. The system represents an innovative technology for removing stuck tubulars and is a low risk alternative to conventional fishing operations. It is the most effective use of rig time while evaluating down hole methods! Resonance System: What does it imply? The Mechanical oscillator - generates axial movement The Work string - transmits resonant energy The Stuck member - fish to be recovered

3 Resonance Method Benefits n Potential savings versus Conventional fishing n Ability to Circulate and Rotate n Substantial savings on rig time n Quickly and easily applied n No Downhole intervention n Reduced risk

4 The Effects of Oscillations n Great force applied at the stuck point. n Dilation and contraction of pipe body. n Fluidization. n Reduction of friction. Resonance Technology Freeing Stuck Objects in the Well bore: n Resonance is applied from surface and transmitted to the stuck area.

5 n The stuck pipe is subjected to cyclic loading that progress through the stuck interval from top to bottom. n Frictional resistance tends to decrease with resonance, the sticking problem will tend to degrade and the pipe can become free. Drilling Applications n Drill pipe and bottom hole assembly n Differential stuck n Key-seated n Hole collapse n Junk retrieval n Installation of casing and liners n Casing recovery for sidetrack Other Application: Freeing stuck tubing or drill-pipe Shifting stuck sliding sleeves Freeing stuck production packers Freeing stuck bridge plugs Freeing stuck Gravel Pack Screens Freeing stuck retrievable whip-stocks Will aid in most fishing operations Swedging out collapsed tubing Freeing and retrieving tubing conveyed perforating Reducing friction drag in casing and liner deployment

6 VibraEnforcer Specifications Bi-Directional Rams 4 each Bi-directional slip rams with a diameter of 180mm Maximum closing pressure is 207 bars Maximum pulling/pushing force is 215 tonn Slip rams for 2-7/8, 3-1/2, 4-1/2, 5 and 5-1/2 Tubing All necessary piping, valves, hoses and seal kits

Main Drive case Main Drive case with top and bottom support plates and center hole with a diameter of 8,3 inch 8 each bearings GRNA 901 with a diameter of

7 Main Drive case Main Drive case with top and bottom support plates and center hole with a diameter of 8,3 inch 8 each bearings GRNA 901 with a diameter of 190x90x64 mm 4 each eccentric loads each with a weight of 85 kg 4 each bearing housings 2 each hydraulic motors with a maximum revolution of 700 rpm 2 each axel

8 6 each spacers Load compensator 4 each hydraulic cylinders each 125x900 mm. Maximum pressure rating is 207 bar. Maximum pulling force is ton 4 each accumulators with a volume of 20 liters each and preloaded to 30 bars Hoses and piping between accumulators and cylinders including a connection manifold. 1 each bottom plate with a 8,3 inch diameter hole through the center. Plate dimensions are

9 1240x900x60mm Calculation Report and Stress Analysis Report

14 Hydraulic Power Pack 100 KW Diesel Hydraulic power pack Capacity Frame Frame size Hydraulic tank Engine Hydraulic pump Control valve Pressure filter Return filter Gauges Accumulators Battery Piping Hydraulic hoses 120 litres per minutes at 3000 PSI Full skid with fork lift pockets and lifting points for crane 2400 x 2400 x 2400 mm capacity of 500 litres, stainless steel material, level indicator visual, temperature indicator, pressure balance filter and filling cap. Temperature and level alarm. 6 Cylinder Detroit, SUN 6105 IE with 100 KW at 1600 RPM, including starter panel, stop solenoid, alternator, temperature control and exhaust piping. Diesel tank capacity is 100 litres Variable pressure compensated LS piston pump with capacity of 75 ccm including safety bleed valve 6 section control valve with pressure regulation and pressure gauges 10 micron filter with visual indicator 10 micron filter with visual indicator 63 diameter OD 0 to 3500 PSI 4 each 50 litres accumulators 1 each 12 volt, 80 ampere Gold-plated seal ring Hydraulic hoses from power pack to control panel shall be ¾ OD and rated for 5000 PSI working pressure and shall be 15 meters long Control Panel Panel Functions Gauges Hydraulic Hoses A remote operated panel shall accomplish the power pack 6 functions shall be operated from the panel: - Stationary gripper ram open and close - Travelling gripper ram open and close - Main jack up and down - 3 auxiliary functions open and close Each function shall have a corresponding pressure gauge in PSI with pressure adjustments The panel shall be equipped with complete hydraulic hoses for full operation. The hoses shall be ½ inch OD, be minimum 3 meters long and shall be rated for 5000 PSI working pressure.

16 Confirmed prices Qty Description Unit price Total price NOK 1 VibraEnforcer Unit 950, ,000 Hydraulic Power Pack 1 Function testing and acceptance Included Included 1 Documentation and certification Included Included

17 Delivery Terms Delivery time Testing Time VAT Delivery Currency Documentation Payment 12 weeks 1 week N/A BMS DePro NOK Data sheet, operational procedures i.e. 30 days after approved acceptance test

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