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Cyclic Steam Injection

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heavy oil production treatment

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Cyclic Steam Injection

  1. 1. CSS Technology For Heavy Oil <ul><li>Introduction </li></ul><ul><li>2. CSS Mechanism And Main Mature Technologies </li></ul><ul><li>3.Some Considerations In CSS </li></ul>
  2. 2. 1.2 Clascification standard Of Heavy Oil Classification Standard Of Heavy Oil Super heavy oil Extra heavy oil Conventional heavy oil ﹥ 0.9800 ﹥ 0.9500 ﹥ 0.9200 gravity ( 20℃ ) Second standard ﹥ 50,000 Super 10,000 ~ 50,000 Extra 100 ~ 10,000 Conventional Gas-free viscosity (mPa.s) (50℃) First standard Classification
  3. 3. <ul><li>Heavy Oil Recovery Techniques includes </li></ul><ul><ul><li>Cyclic Steam Stimulation (CSS) </li></ul></ul><ul><ul><li>Steam flooding </li></ul></ul><ul><ul><li>Water flooding </li></ul></ul><ul><ul><li>Steam Assisted Gravity Drive (SAGD) </li></ul></ul><ul><ul><li>Water flooding with N 2 and chemical agents </li></ul></ul><ul><ul><li>Cold heavy oil production with sand (CHOPS) </li></ul></ul><ul><ul><li>In-situ combustion </li></ul></ul>1.3 Heavy Oil Recovery Technologies
  4. 4. CSS is also known as steam huff and puff 2.1 CSS Production Process
  5. 5. 2.2 CSS Production mechanism Main mechanisms <ul><li>( 1 ) Oil viscosity reduction </li></ul><ul><li>( 2 ) Thermal expansion of oil </li></ul><ul><li>( 3 ) Blocking removal </li></ul><ul><li>( 4 ) Gravity drainage </li></ul><ul><li>( 5 ) Solution gas drive </li></ul><ul><li>( 6 ) Formation compaction </li></ul>Oil viscosity reduction Viscosity vs. Temperature curve
  6. 6. 2.3 Main mature technologies for CSS <ul><li>Steaming injection system include </li></ul><ul><li>steam generator, </li></ul><ul><li>pipeline , </li></ul><ul><li>thermal well head </li></ul><ul><li>steam injection string </li></ul>(1) High-efficiency steam injection technology <ul><li>Steam generator </li></ul>
  7. 7. 2.3 Main mature technologies for CSS Steam generator flow chart
  8. 8. O.D : 114mm (outer tube) I.D : 62mm(inner tube) T : 350℃ P : 21MPa thermal conducti vity : 0.02-0.007W.m/℃ 2.3 Main mature technologies for CSS <ul><li>Steam Injection String </li></ul>Vacuum Insulated Tubing <ul><li>Vacuum Insulated Tubing </li></ul><ul><li>Compensation pipe </li></ul><ul><li>Thermal sensitive packer </li></ul>
  9. 9. heat conduction coefficient is only 0.007 W/m ℃. It can reduce heat loss in wellbore and increase steam quality Formation Compensation pipe Thermal packer Vacuum insulation tubing 2.3 Main mature technologies for CSS Vacuum insulation tubing 40-60% 0.007 Vacuum insulation tubing 20-40% 0.07 Conventional insulation tubing Steam quality at bottom of wellbore ( 75%@well head ) Thermal conductivity (W/m.℃) Type
  10. 10. Outer tube Inner pipe Seal ring Gland 2.3 Main mature technologies for CSS During the period of steam injection ,the thermal sensitive packer is set down, the insulated tubing will extend due to high temperature, the compensation pipe is used to compensate the extended length of steam injection string .so that the insulation tubing can not get bending Compensation pipe
  11. 11. 2.3 Main mature technologies for CSS <ul><li>The packer will set down due to expansion of thermometal when start injecting steam. </li></ul><ul><li>After the steam injection ,the packing seal will go back to the original position, the packer will be upset automatically </li></ul>Rubber seal barrel Thermal sensitive packer Reduce the heat loss Preserve the casing Setting and unsetting mechanics
  12. 12. Low producing ability 2.3 Main mature technologies for CSS (2) High Temp. 4 Parameters Measurement Technique Steam pressure Downhole temperature Steam quality get steam absorbing profile flow rate High temperature test chart
  13. 13. (3) Lifting system: BPU & tubing pump BPU +tubing pump: excellent adaptation and wide us e, is commonly used in lifting system for heavy oil production. (will be discussed in SECTION 3) 2.3 Main mature technologies for CSS
  14. 14. 2.3 Main mature technologies for CSS <ul><li>Steam allocating techniques for multi-zone reservoir </li></ul>Formation Insulated tube Extension pipe Thermal packer Formation Formation Formation Formation Formation Steam allocating valve
  15. 15. Selection Standard for Successful CSS 2.4 Selection Standard for Successful CSS < 100,000 ( 50℃ ) ≥ 50 ≥ 20 ≥ 200 md ≥ 10m ≤ 1,700m Selection standard 1,735 ( 50℃ ) 2,000 ~ 3,000 ( 50℃ ) Viscosity mPa.s 70 75 Oil Saturation % 32 30 Porosity % 4000 2060 Permeability md 30 37.7 Net pay m 550 850 Depth m FNE Qi40(Liaohe) Item

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