After long term product development and field practice, AntonOil has developed a series of mature completion and killing fluid systems in HT, high H2S and CO2 reservoir. These systems have been applied in domestic oilfields for nearly 100 times and achieved great fruits in protection of reservoir, downhole tools and equipments.
1. Technical Features
■ No solid phase, compatible with formation fluid to avoid damaging formation;
■ Density is easy to adjust, to facilitate balance the formation pressure rapidly
■ Stable in HT conditions, excellent rejection capability, very low filtration rate, protect reservoir and stabilize borehole at the same time.
■ Good rheology behavior, facilitate to generate pressure kick towards formation during tripping
■ Good stability at downhole conditions, good capability to resist hydrocarbon, gas invasion;
■ Very low corrosiveness, therefore it can inhibit the corrosion of acidic gas on downhole string to effectively prolong the service life of downhole tools.
2. Performance Index
|
Inspection Item |
Performance Index |
|
Appearance |
brownish red and even fluid |
|
apparent viscosity mPa.s mPa.s |
10~60 |
|
ratio of dynamic shear force |
0.2~0.5 |
|
filtration rate ml： ml/0.69MPa×30min |
≤20 |
|
Density g/cm³ |
1.0~1.8 |
|
Relative expansion ratio % |
≤10 |
|
pH |
8±1 |
|
solid concentration % |
≤1.0 |
|
Static SR slow release velocity g/(㎡.h)（93℃） |
≤0.07 |
3. System Classification and Application
■ ADYJ-I: suitable for deep formation(＞3000m), HT(＞150℃), high CO2 and low permeability gas reservoir.
■ ADYJ-II: suitable for mid-deepth formation(＞3000m), MT-HT(＞150℃), low CO2 and low permeability gas reservoir.
■ ADYJ-IV: Featuring high specific gravity, resistance to HT, no solid phase, suitable for abnormal HTHP formation. Specific gravity: 1.0 ~ 1.8g/cm3, adjustable;
4. Applications
Completions, gas test, fracturing, perforation, workover;
5. Application Effects
They have been applied for nearly 100 times including deep wells, shallow wells, high H2S wells, and high CO2 wells. The application effects are obvious with high performance. They can avoid secondary pollution of reservoir during the operation.
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