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.

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AE Downhole Filter Sub cutaway render on a dark technical background

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.

Superior Protection

Stops particles greater than 5 mm from entering MWD/LWD tools.

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.

Conceptual green flow arrows showing fluid entering from the top and passing through the AE Downhole Filter Sub — Conceptual flow path

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.

15-year product history Used in drilling operations since the early product deployments.

Up to 10x longer life Long screen life compared with short conventional filter hours.

Salym / Shell / Halliburton Documented early verification is available as technical background, while the public story stays focused on the product.

Product Details

Only the most useful close-ups are kept here: serialized marking, centralizer-end detail and the long product perspective.

Close view of serialized marking on a metallic AE Downhole Filter Sub part — All parts are serialized

Centralizer end detail and slotted screen openings — Centralizer-end detail

Perspective view along the centralizer end of the screen assembly — End perspective

Technical Specifications

Standard sizes are selected around BHA geometry, connection, flow range, debris risk and material requirements.

Slot size 5 x 25 mm Assembly top flange, slotted screen, centralizer Materials steel 4145 or non-magnetic option

Size	Collar OD	Overall length	Working ID / lower bore	Filter chamber length
4.75 in	120.65 mm	1700 mm	88.9 / 57.15 mm	1300 mm
6.75 in	171.45 mm	2513 mm	approx. 114.3 / 73.2 mm	2050 mm
8 in	203.2 mm	2700 mm	131 / 76.2 mm	2180 mm
9.5 in	241.3 mm	3100 mm	148.83 / 105 mm	2550 mm

Configuration is finalized against the actual BHA connection, 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.

CNC machine overview used for AE Downhole Filter Sub manufacturing — CNC machining center

Slotted screen machining in a CNC setup — CNC slot machining

Serialized part marking engraved on the AE Downhole Filter Sub assembly — All parts are serialized

Numbered metal blanks used for traceability — Traceability from numbered blanks

Non-magnetic internal screen assemblies — Non-magnetic internal assemblies

Finished AE Downhole Filter Sub assemblies ready for shipment — Ready for shipment

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.

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For a useful review, include tool size, connection, BHA context, flow range, debris concern and required quantity of sub bodies and replacement screen assemblies.

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