3 / 8 '' Od X 0.065 '' Wt Geothermal Tubing Downhole Injection Line Coiled Metal

3 / 8 '' OD x 0.065 '' WT Geothermal Tubing Coil Downhole Injection Line

Meilong Tube specially manufactures seamless and redrawn, welded and redrawn coiled tubing which are made from corrosion-resistant austenitic, duplex, super duplex stainless steels and nickel alloy grades. The tubing is used as hydraulic control lines and chemical injection lines specially serving oil and gas, geothermal industry.

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

Super Duplex 2507 for Chemical Injection Line

Norm Equivalence

Duplex 2507 is a super duplex stainless steel designed for applications which demand exceptional strength and corrosion resistance. Alloy 2507 has 25% chromium, 4% molybdenum, and 7% nickel. This high molybdenum, chromium and nitrogen content results in excellent resistance to chloride pitting and crevice corrosion attack and the duplex structure provides 2507 with exceptional resistance to chloride stress corrosion cracking.

Usage of Duplex 2507 should be limited to applications below 600° F (316° C). Extended elevated temperature exposure can reduce both the toughness and corrosion resistance of alloy 2507.

Duplex 2507 possesses excellent mechanical properties. Often a light gauge of 2507 material can be used to achieve the same design strength of a thicker nickel alloy. The resulting savings in weight can dramatically reduce the overall cost of fabrication.

Corrosion Resistance of Super Duplex 2507 Injection Line

2507 Duplex is highly resistant to uniform corrosion by organic ac Super Duplex 2507 Plateids such as formic and acetic acid. It is also highly resistant to inorganic acids, especially if they contain chlorides. Alloy 2507 is highly resistant to carbide-related intergranular corrosion. Due to the ferritic portion of the duplex structure of the alloy it is very resistant to stress corrosion cracking in warm chloride containing environments. Through additions of chromium, molybdenum and nitrogen localized corrosion such as pitting and crevice attack are improved. Alloy 2507 has excellent localized pitting resistance.

Characteristics of Super Duplex 2507 Injection Line

High resistance to chloride stress corrosion cracking

High Strength

Superior resistance to chloride pitting and crevice corrosion

Good general corrosion resistance

Suggested for applications up to 600° F

Low rate of thermal expansion

Combination of properties given by austenitic and ferritic structure

Good weldability and workability

Injection Line Tubing Weight per Meter (kg)

Super Duplex 2507 (UNS S32750)

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.