Scrapers for dewaxing, wells cleaning, tubing cleaning, milling scraper, bladed scraper, blade type scraper, spear type scraper




Milling scrapers “SF-Tekhno” are designed for dewaxing/ removal asphaltene, resin, and paraffin deposits from tubing ID in high rate wells. Rotation of cutting head created by a substantial flow, i.e. over 30 cubic meters per day, effectively ensures cutting paraffin layer from tubing internal surface.
Effective cleaning is achieved through regularity of tubing cleaning using automatic well dewaxing unit “UDS-Tekhno 101” or semiautomatic slickline winch “LKI-Tekhno”.  
Scrapers made by LLC NPF “TehSmart” have similar design as other scrapers such as dynamic scraper “SD”, expandable scraper, Bolotov’s scraper, PUR.55, TU.55, PU.55, DI.55, KI.55, PA.55, KP.55, PL.55, SR-73, SL-73, Stroev's scraper. 
Scrapers by LLC NPF “TehSmart” are suitable for use with well dewaxing units of the following types: UDS, UDS-Tekhno, UDS-3000T, UDS-1M, UOK-NKT, PADUS, PADU-3M, DSA-18, MDS-010, Suleymanov’s winch.
To ensure effective wax removal, wellbore and fluid condition should be considered when selecting scraper elements for a cleaning job. Cutting ends are replaceable elements, and can be changed upon prior agreement with Client. Diameter of cutters, weights size and mass, scraper configuration can be agreed on prior to a cleaning job. Lead weight while preserving smaller size provides for larger mass for a more effective operation result.
A mandatory element is a swivel joint in order to prevent twisting of wire followed by kinks formation resulting in a potential job failure on a wellsite.
To prevent damage of tubing with internal polymer coating, heavy duty plastic mills are used in a scraper. They keep the internal coating of the tubing intact.


Cutterheads are made in two types: steel and plastic of high strength innovative polymer. Plastic cutters do not create scratches on internal surface of polymer tubing.  
The model design allows – at sufficient well rates – for high speed axial rotation of the cutter (mill). The most effective cleaning is achieved when using coupled cutters – each rotating in different directions (cutters are coupled with a special hub).
When selecting cutting heads it is recommended to check size of a sinker bar (weight stem). Its size should not exceed the size of the head. 

Cutterhead for “SF-Tekhno” scraper for wells cleaning using mechanical methods (dewaxing)

Weight Stem

Stems are made of steel or lead  
Lead stems are more preferred than steel stems in order to maximize cleaning quality and speed of pre-job operations as lead weighs more than steel, thus, resulting in a smaller size of stem.  
Application of lead weights eliminates need in large multi-section lubricators. 
Blades and cutters are securely fixed in the weight stem body with an Allen key screw.

Weight stem for

Swivel Joint

Swivel joint allows preventing twisting of the wire and formation of kinks
Is a highly effective failure prevention tool for dewaxing, wireline and slickline conveyed interventions.
Connection thread: male M27х1.5 / female M12х1.75  (other thread types can be made if requested by Client)

Swivel joint for well cleaning jobs using mechanical methods (dewaxing)

Rope socket

Rope socket is designed for connecting 2.5 mm diameter wire and downhole tools.
Rope socket has a unified design among many manufacturers and remains universal. A special “mushroom-type” head, 20 mm OD, allows using the rope socket with head catcher “LU” or collet-type catcher “LTs” which prevents and promptly addresses failures caused by a wire breakdown. 
Mandatory heat treatment ensures high tensile strength properties of the rope socket.  
Connection thread: M27х1.5

Rope socket used for attaching wire (slickline) to a downhole scraper