1. Technical features.
Self-circulation well cleanout technology in deep water injection well is mainly used in the water injection well，and its depth is 3000~6000m. It is the truck-mounted cleanout unit which uses its own water treatment equipment to dispose sewage from the well and re-inject the qualified water into the hole. No more fresh water is added in（during） the whole cleanout process ,and the sewage is not necessarily discharged and returned to the sewage treatment station. The qualified well cleanout is up to the same water quality out and in at the well head.
2. Technological process.
■ Combine settling and filtering, physical and chemical purification..
■ Well head backwater-cyclone desanding-cyclone deoiling-static mixer-multi-way current settling tank-first-stage filtering-second-stage filtering-third-stage filtering-purified water tank-well cleanout pump-water injection well head..
■ In the process, high-performance water treatment agent is added to achieve the normal injection water quality..
■ Through multiple circulations(cycles) of the above "treatment-well cleanout -treatment", the impurities are brought out of the water injection well with the clean borehole and near-hole vicinity to improve the water-absorbing capacity in the water injection well.
3. Main parts of equipment.
■ Cyclone desander.
■ Static mixer.
■ Combined-type deoiler (settling tank).
■ Three-stage filter.
■ Titanium nano polymer corrosion prevention.
■ Combined-type well cleanout manifolds.
4. Features and performances.
■ Unique desanding, deoiling, settling and water filtering processing unit and high-performance water treatment agent. Under the condition of mechanical impurity of inlet water quality ＞5000PPM and Oiliness ＞5000PPM, mechanical impurity of outlet water quality ＜3PPM and Oiliness ＜8PPM after treatment..
■ High discharge volume , high pressure, and strong corrosion resistance..
■ Multiple well cleanout processes, needed process can be automatically switched in response to water quality change..
■ Whole sealing, no sewage discharge, and meeting the requirements forsafety and environmental protection.
Main performance parameters and comparison table
|
|
Well cleanout parameter |
Applicable（available） conditions |
Construction features |
Process |
|
|
Well cleanout pressure |
Well cleanout strength |
Depth（m) |
Formation water |
Separate settling |
Filtering |
Anti-corrosiveness |
switch process |
Operating manifolds |
|
(Mpa） |
（方/时) |
Salinity（ppm) |
CI content（ppm) |
Cleanout settling sep |
First-stage filtering |
None |
Second-stage filtering |
None |
|
Conventional method |
8 |
30 |
＜3000 |
low |
low |
well cleanout settling separate system |
Third-stage filtering |
strong |
Third-stage filtering |
Dedicated manifold |
|
Deep-well well cle |
16 |
50 |
3000-6000 |
30 |
10 |
|
