Article Archive
Article Archive
- Introduction of Cement Slurry System (Part 1)
- Introduction of Cement Slurry System (Part 2)
- Introduction of Cement Slurry System (Part 3)
- Introduction of Cement Slurry System (Part 4)
- High Temperature and High Pressure Cementing Technology
- Low Density Cementing Slurry Technology
- Anti Gas Channeling Cementing Technology
- Drag Reducing Agents (DRA) or Drag Reducers (DR)
- Nitrogen Surfactant Compound Huff and Puff Technology
- Oil Washing Technology for Increasing Production
Formula performance:
Typical formula: 100g "G" cement +80g sea water +6g ZOC-G71L+25g floating bead +26g reinforcement +1g ZOC-F44L +1g ZOC-H21L +0.3g ZOC-X60L
|
Density(g/cm³) |
Temp（℃） |
Thickening time （min） |
Rheometer Reading Θ600/Θ300/Θ200/Θ100/Θ6/Θ3 |
API Fluid Loss (ml) |
Compressive Strength 72 ℃ (MPa/24hr/48hr) |
|
1.50 |
60 |
155 |
156/110/89/60/23/17 |
30 |
21.4/25.6 |
缓凝剂对稠化时间的影响
|
Test Formula (Density 1.65g/ml） |
Cement+Sea Water+ZOC-X60L（0.4%）+ZOC-F44L（1%）+ZOC-G71L（7%）+ZOC-H21L+ZOC-B10（1.5%）+ZOC-BT1（5%）+ZOC-P61%（11%） |
|
Test Condition |
Temp：38℃，Pressure：2000psi，Heating Time：28min |
2. Polyvinyl alcohol system
brief introduction
(1) It is made of polyvinyl alcohol (PVA) fluid loss reducer as main agent, including pre crosslinking type, anti pollution type and anti freezing type.
(2) When there is a certain pressure difference between cement and formation, a dense and tough filter membrane is formed at the interface to reduce water loss and prevent gas channeling.
Form
Oil well cement: grade G
Fluid loss additives: ZOC-G70L, ZOC-G71L, ZOC-G72L, dosage 5-9%
Dispersant:ZOC-F41L, ZOC-F42L, ZOC-F44L, dosage 0.3-2.5%
Defoamer: ZOC-X60L, ZOC-X61L, dosage 0.2-0.5%
Optional materials:
Gas channeling inhibitor: ZOC-GR5
characteristic;
(1) The slurry system is suitable for well conditions from room temperature to 110 ℃
(2) The water loss of API can be controlled within 50ml
(3) It has a certain ability of salt resistance, and can be prepared with sea water
(4) Adjustable thickening time, high compressive strength and good settlement stability
(5) The transition time can be less than 10 minutes by combining with special coagulant
(6) It has good leak proof, gas channeling proof and impermeability.
(7) The price is cheap and the performance is stable
It is suitable for cementing operation of adjustment well in low and medium temperature well section, easy channeling and loss formation.
Formula performance:
|
Density (g/cm³) |
BHST (℃) |
BHCT (℃) |
Thickening time（min） |
API water loss（ml） |
12h compressive strength（MPa） |
24h compressive strength（MPa） |
|
1.93 |
61 |
46 |
133 |
<50 |
15.46 |
21.45 |
Key points of system use and maintenance:
(1) The service temperature shall not exceed 110 ℃
(2) In order to control the water loss well, the threshold dosage must be more than 5% (bwoc).
(3) It has slight thixotropy and can increase the dosage of dispersant appropriately.
(4) The expansion agent can prevent the shrinkage of cement paste.
- The ability of anti pollution is poor. Good flushing fluid and isolation fluid are used in cementing to prevent pollution.
Formula:
|
Test formula (density: 1.9g/ml) |
Cement +Seawater +ZOC-X60L（0.3%）+ZOC-F41L（1.5%）+ZOC-G71L（6.5%）+ZOC-G34S（0.6%）+ZOC-H21L+ZOC-B10(1.0%) |
|
Test conditions |
Temperature: 90℃, Pressure：6000psi |
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