1 / 2 '' OD X 0.065 '' Nickel Alloy Tubing Geothermal Downhole Tubing Duplex 2205

1 / 2 '' OD x 0.065 '' WT Downhole Geothermal Tubing in Coil Made from Duplex 2205

To assure produced fluid flow and protect your production infrastructure from plugging and corrosion, you need reliable injection lines for your production chemical treatments. Chemical injection lines from Meilong Tube help enhance the efficiency of your production equipment and lines, both downhole and at surface.

Our tubing is characterized with integrity and quality to be specially used in subsea conditions in the industries of oil and gas extraction, geothermal power generation.

Application of Injection Line

Hot water flooding is a thermal recovery technique in which hot water is injected into a reservoir to increase heavy to medium crude oil production. The heat from hot water reduces the viscosity and density of crude oil allowing it to flow easier to the production well. This process, also known as hot water injection increases oil recovery factor and maintains the well production rate for a longer period.

The rise of global development in the last century has seen a rapid increase in the demand for oil. Heavy oils have attracted the world at large due to its abundant reserves and increased development in the past decades. Various techniques such as cold and thermal production have been applied to recover heavy reservoir oils. Cold production methods include chemical flooding (polymer flooding, surfactant flooding, gas flooding etc.), natural depletion and water flooding. Thermal production includes injecting thermal fluid into reservoir, such as cyclic steam stimulation, steam flooding, and steam assisted gravity drainage or generating heat in the reservoir. The same technology and method is used for injecting hot water into geothermal wells for realizing material exchange.

Typical size of Chemical Injection Line

Outside diameter of control lines is mainly 3/8’’ (9.53mm), 1/2'' (12.7mm0).

Wall thicknesses: 0.035’’ (0.89mm), 0.049’’ (1.24mm), 0.065’’ (1.65mm), 0.083'' (2.11mm)

Control line tubing is available in lengths from 400 feet (122 meters) to 32,808 feet (10,000 meters). No orbitally butt welds.

Other specifications (1/8’’ to 3/4’’) are available on request.

Importance of Chemical Injection Line

Each one tubing coil is a completely continuous length without orbital welds.

Each one tubing coil is hydrostatic tested at minimum 11,600 psi.

The test can be witnessed on site by the third party inspectors (SGS, BV, DNV).

Other tests are eddy current test, chemicals, flattening, flaring, tensile, yield, elongation, hardness for the material quality.

The Role of Chemical Injection Line

In the oil and gas industry we inject chemicals in order

to protect the infrastructure

to optimize processes

to assure flow

and to improve productivity

Alloys for Injection Lines

Injection Line Tubing Features

Close dimensional tolerances

Considerably enhanced mechanical properties

Superior surface finish

High cleanness of inside surface

Controlled ovality, eccentricity

Duplex 2205 Injection Line

Duplex 2205 is a nitrogen enhanced duplex stainless steel that was developed to combat common corrosion problems encountered with the 300 series stainless steels. “Duplex” describes a family of stainless steels that are neither fully austenitic, like SS304 stainless, nor purely ferritic, like SS430 stainless. The structure of 2205 duplex stainless steel consists of austenite pools surrounded by a continuous ferrite phase. In the annealed condition, Duplex 2205 contains approximately 40-50% ferrite. Often referred to as the work horse grade, Duplex 2205 is the most widely used grade in the duplex family of stainless steels.

The advantage of a duplex structure is that it combines the favorable qualities of a ferritic alloy (stress corrosion cracking resistance and high strength) with those of an austenitic alloy (ease of fabrication and corrosion resistance).

Usage of 2205 Duplex stainless steel should be limited to temperatures below 600° F. Extended elevated temperature exposure can embrittle Duplex 2205 stainless steel.

Corrosion Resistance of Duplex 2205 Injection Line

2205 duplex stainless steel is a cost effective solution for many applications where the 300 series stainless steels are susceptible to chloride stress corrosion cracking. Stress corrosion cracking occurs when stainless steels are subjected to tensile stress, while in contact with solutions containing chlorides. Increasing temperatures also increase the susceptibility of stainless steels to stress corrosion cracking.

The combination of chromium, molybdenum and nitrogen convey the good resistance of 2205 to chloride pitting and crevice corrosion. This resistance is extremely important for services such as marine environments, brackish water, bleaching operations, closed loop water systems and some food processing applications. The high chromium, molybdenum and nitrogen contents of 2205 provide corrosion resistance superior to common stainless steels, such as, SS316L and SS317L in most environments.

Injection Line Tubing Weight per Meter (kg)

Duplex 2205 (UNS S32205)

Geothermal Tubing Properties

Seam-welded & floating internal plug redrawn tubing. Supplied in the annealed condition

Continuous length without orbital joint welds

Theoretical burst pressure based on minimum wall thickness, and minimum tensile strength

Theoretical collapse pressure based on minimum wall thickness, and minimum yield strength

Pressure rating at 100°F (38°C), neutral and static conditions

Tubing Process and Packing

Seamless- pierced, redrawn, annealed (multi-pass circulation process)

Welded- longitudinally welded, redrawn, annealed (multi-pass circulation process)

Packing- Tubing is level wound coiled on the metal / wooden drums or spools.

All drums or spools are packed in wooden crates for easy logistic operation.