Superior Protection
Stops particles greater than 5 mm from entering MWD/LWD tools.
AE DOWNHOLE FILTER SUB
DHS: field-proven downhole filtration for MWD/LWD protection.
AE Downhole Filter Sub (DHS) uses a long reusable slotted screen assembly to protect sensitive telemetry and measurement tools from debris while keeping flow restriction negligible in field use.
Negligible pressure drop
Up to 10x service life
Reusable screen assembly
5 mm slot protection
Key Benefits
DHS is built around a simple idea: protect expensive downhole tools without turning the BHA into a hydraulic restriction.
Optimized Flow
Narrow 5 mm slots and long screen area maintain high flow capacity with negligible pressure drop.
Extended Tool Life
Reduces wear, abrasion and internal damage to sensitive instruments.
Easy Maintenance
The screen can be cleaned, inspected and re-used after each run.
Proven Reliability
Operational use since 2012 with documented verification runs and long field history.
How It Works
The AE Downhole Filter Sub (DHS) consists of a collar with an integrated internal screen assembly: top flange, slotted screen and centralizer.
- Slotted screen: 5 mm slots allow drilling fluid to flow freely while blocking larger particles.
- Centralizer apertures: secondary openings help clean fluid between the screen and collar.
- Top flange: the screen is threaded to the top flange and seats inside the collar.
- After the run: the screen is cleaned, inspected for wear and prepared for re-use.
Built for Regular Operations
DHS has moved from early documented trials into long-term field use. The website keeps this simple: the product has a long operating history, and detailed trial data can stay in technical discussions instead of taking over the page.
Product Details
Only the most useful close-ups are kept here: serialized marking, centralizer-end detail and the long product perspective.
Technical Specifications
Standard sizes are selected around BHA geometry, connection, flow range, debris risk and material requirements.
Filter type reusable slotted screen assembly
Slot size 5 x 25 mm / 0.20 x 0.98 in
Materials AISI / SAE 4145 steel or non-magnetic option
Ratings 20,000 psi max; -58 to +482 °F (-50 to +250 °C)
| Parameter | Details |
|---|---|
| Body material | AISI / SAE 4145 steel or non-magnetic material |
| Min. yield strength | 120,000 psi / 827 MPa |
| Connection types | NC38, NC50, 6-5/8 REG, 7-5/8 REG; final connection by BHA review |
| Max. operating pressure | 20,000 psi / 138 MPa |
| Temperature rating | -58 to +482 °F (-50 to +250 °C) |
| Filter element | Reusable slotted screen assembly with top flange and centralizer |
| Size | Max OD | Overall length | Screen flow area | Collar flow area |
|---|---|---|---|---|
| 4 3/4 in | 4.75 in120.65 mm | 66.9 in1700 mm | 31.52 sq in203 cm2 | 1.94 sq in12.5 cm2 |
| 6 3/4 in | 6.75 in171.45 mm | 98.9 in2513 mm | 61.20 sq in395 cm2 | 6.48 sq in41.8 cm2 |
| 8 in | 8.00 in203.2 mm | 106.3 in2700 mm | 61.20 sq in395 cm2 | 6.84 sq in44.1 cm2 |
| 9 1/2 in | 9.50 in241.3 mm | 122.0 in3100 mm | 92.50 sq in597 cm2 | 9.48 sq in61.2 cm2 |
Configuration is confirmed against the actual BHA connection, material requirement, flow range and run objective.
Manufacturing, Service and Traceability
DHS is supported by practical shop-floor control: machined screen assemblies, serialized parts, readiness for shipment and traceable material blanks.
Aphanas Energissimo
AE Downhole Filter Sub (DHS) is one product from Aphanas Energissimo's oilfield engineering and downhole equipment work. The company also supports drilling engineering, rigsite supervision, directional drilling and MWD/LWD personnel projects.
Discuss tool size, BHA context and screen assemblies.
For a useful review, include tool size, connection, BHA context, flow range, debris concern and required quantity of sub bodies and replacement screen assemblies.