23.03.2017

LLC Dneprovsky Pipe Works has developed a project for the production of waterproofing with extruded polyethylene pipes of the following dimensions:

Ø 42 - 168mm

Ø 508 - 1420 mm

Extruded polyethylene is a polymer material from which the anti-corrosion coating of steel pipes in water pipelines and gas supply networks is made.

This coating protects the metal from contact with moisture, stray currents, and prevents the appearance of rust and fungus.

Subject to the rules for its application, the service life of steel communications increases several times.

At this stage, preparatory work has been carried out and the workshop has been prepared for installation

17.05.2016

At the enterprise, the issue of the quality of products is one of the priority places. The company has implemented and operates a Quality Management System, which is confirmed by such certificates as ISO 9001: 2008, DSTU ISO 9001: 2009, as well as certificates of conformity for manufactured products, such as API 5CT, GOST 633-80, GOST 632-80 and for production electrowelded pipes.

Along with the fact that the enterprise is constantly increasing the stock of measuring tools and control devices, a large BP-2 projector was put into operation, for the purpose of non-destructive testing of the thread parameters, both of the finished product and the thread-forming tool before installation on machines. The profile is checked by taking an impression of the finished part, for which a non-shrinking material is used. The prepared cast is placed on the desktop of the projector and, using a 50x magnification, it is checked against the reference drawing located on the projector screen.

Also, using microscrews and reading devices of the projector, they measure the thread pitch, average and inner diameter, actual height and angles of the thread profile.

The projector allows you to make these measurements with an accuracy - linear up to 0.005 mm and angular up to 3 '.

Casing pipe with gastight coupling connection of premium-class DGT with sizes 244,48Х11,99 mm grade P110 and V150 and 194Х12,7 mm grades N80 and P110 were produced by an enterprise in December 2014 and tested industrially in terms of the oil well #2 on Vodianovskaya area field.

Meanwhile screwing and carrying pipes down the column, no any defects have been detected, the tightness of the oil well meets the project documentation requirements, the total depth of the oil well is 5500 meters out of which the casing with threaded connection DGT size 244,48X11,99 grade P110 and V150 made up to 4585 meters, at in-situ pressure of the well 54.5 MPa.

Group of specialists from DNIPROVSKIY PIPE WORKS have elaborated a Casing pipe assortment in 2014 that is called «DGT® Premium Casing» with gastight coupling connection of premium-class, in a wide range of applications and environments for the oil and natural gas industry

APPLICATION

Gas-tight coupled connection of ‘Premium’ Class with trapezoid threading on a casing pipe is destined for construction and operation in vertical and controlled directional wells of oil, gas and gas-condensate field

OPTIMIZED DESIGN

The threading connection has been developed to meet ISO 13679, CAL IV technical specification. Connection design shall ensure quick and easy make-up in the most extreme environment

STRESS DISTRIBUTION

Stress distribution in string is optimized by connection design

STRETCH EFFICIENCY

100% efficiency connection for stretching equivalent to pipe body

SEALING AREA LOCATION

A distance to pin butt-end improves the safety for transporting, preparation and connection make-up

CLEARANCE

A groove before sealing area is destined to protect threading from extra pressure formed by compressed lubricant as well as for excessive lubricant collection place

STREAMLINED INNER PROFILE

A streamlined inside profile for connection with fine tolerance shall minimize turbulence in gas flow, put no obstacle to well construction jobs and diminish ‘wear-out sensitivity’

“METAL-TO-METAL” SEALING

A patented sealing system with a conical “metal-to-metal” seal and stabilizer that has the same strength parameters with pipe body will perform high gas-tightness even for critical environment under heavy pressure and high operation temperature as well as in case of operation of casing pipe (dimension range 5” – 13 3/8”) for tubing performance.

A “gripped” thread will improve with standability to possible shifting and decrease circular stress in coupling in case of bending, stretching or compression of a casing string. That makes possible to operate the connection in extra-depth and controlled directional wells.

A stabilizer like a guide with double-beveled panel for better fit, fit angle and enlarged thrust shoulder shall withstand to hard collapse and compression ambient.

It is resulted to outstanding tightness and construction fatigue of connection implied to destructive combined loading.