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  1. 1. Asghar Ali (13PG28) Petroleum(Production) Engineering department Ocean Pakistan Limited Islamabad SUMMER INTERNSHIP 2015
  2. 2. CONTENTS Well completion Completion tools Nodal Analysis PIPESIM PROSPER DST Stimulation
  3. 3. Well completion oWell Completion is the process of making a drilled well ready for production. oIt involve casing ,cementing, running tubing and its tools and perforating oOpen hole completion Casing is set above pay zone and well has only charismas tree and no tubular equipments and packer oCased hole completion Pay zone is cased and well has tubing and downhole equipments
  4. 4. Completion types
  5. 5. Completion tools ½ Mule Shoe or wireline re-entry guide No-Go Nipple Perforated Joint Landing Nipple Flow Couplings Seal Bore Extension
  6. 6. Downhole tools Locator Seal Assembly Packer Sliding Sleeve Door Sub-Surface Safety Valve (SSSV) Tubing Hanger Pup Joint Cross Over
  7. 7. Nodal analysis Nodal analysis is a methodology to analyze the production system as a unit to calculate its capacity. The purpose of nodal analysis is to: design each component of the production system, detecting production restrictions and  calculating the effect of changing one or more components on the capacity of production system
  8. 8. Possible Pressure Losses In Production System Loss in porous medium Loss across the completion Loss across the restriction Loss across the safety valve Loss across the choke Loss across the inflow line Total loss in tubing Total loss in flow line
  10. 10. Softwares PIPESIM Pipesim is a Production Optimization software used to Design Pipeline & Facilities, Do Well Performance Analysis Nodal Analysis Sensitivity analysis etc
  11. 11. Noda analysis Case study Given the following hypothetical data, does a Nodal Analysis operation for a given outlet (wellhead) pressure to determine the operating point flow rate and BHP and the absolute open flow potential (AOFP) of the well? Black Oil PVT Data well bore deviation data Reservoir data Water cut 15% GOR 600 scf/stb Gas S.G 0.5 Water S.G 1.08 Oil API 33 (API) Measured depth(ft) True vertical depth (ft) 0 0 800 800 2400 2350 4700 4650 7100 6900 8000 7400 Reservoir pressure 3400 psia Reservoir temperature 180 F Productivity index 8 stb/d/psi
  12. 12. Software model
  13. 13. Software output
  14. 14. Results By inspecting plot following results are obtained. Operating point flow rate = 9600 stb/d Operating point BHP = 1907 psia AOFP = 15114 stb/d
  15. 15. Software PROSPER PROSPER (PRO= Production, S=System, PER=Performance) It is a well performance, design and optimization program for modeling oil and gas wells. PROSPER can assist the production or reservoir engineer to predict tubing and pipeline hydraulics and temperatures with accuracy. It is more reliable as it include PVT data.
  16. 16. DRILL STEM TESTING (DST) A drill stem test (DST) is a temporary completion of a wellbore that provides information on whether or not to complete the well. Zone is isolated by packers. Data obtained from a DST includes : ofluid samples, oreservoir pressure oformation properties, including permeability (k), skin (S), and radius of investigation etc
  17. 17. DST tools Perforated Pup joint Retrievable Packer Safety joint Gauge Carrier Jar  Reversing Valve Slip Joints
  18. 18. Stimulation Stimulation is a process to open up new channels in the rock for the oil and gas to flow through. Stimulation is used to increase permeability or to restore production. Two stimulation techniques are used: Acidizing and Hydraulic fracturing.
  19. 19. Acidization: In acidization, acids are injected into well to increase permeability near the well bore. There are two types of acid treatment: i)matrix stimulation ii) Acid fracturing Matrix Acidization: In this process acid is pumped into the well and into the pores of the reservoir rocks at pressure below the formation fracture pressure. In carbonate reservoir HCI is used. In sandstone mud acid (HCL+HF) is used.
  20. 20. Acid Treatment design Acid design for matrix acidization include: Pre-flush: are used ahead of an acid treating solution, to prepare or condition the formation. Main treatment: It includes HF to dissolve clay / sand and HCl to dissolve carbonates Post-flush : It is used to make the formation water wet and to displace acid away from wellbore Displacing fluid : It is fluid such as nitrogen, used to displace the acids to its destination.
  21. 21. Main treatment additives Corrosion Inhibitor Surfactant Anti-sludge agent Clay Stabilizer Diverting Agent