Since its Foundation, Dynoland has been devoting itself to providing comprehensive and high-quality products and services for global petroleum and gas industry for many years. It can not only provide common steel grade casing and tubing but also provide special steel grade casing and tubing.

Special Steel Grade Tubing and Casings from Dynoland are available with the following types and features:

Ⅰ. Anti-Collapsing casing series
Self-development:
High collapsing Series:DL80T\DL90T\DL110T\DL125T\DL130T\DL140T\DL150T\DL155T\DL160T
Super High collapsing Series:DL80TT\DL90TT\DL110TT\DL125TT\DL130TT\DL140TT\DL150TT\DL155TT\DL160TT
High collapsing + High Anti-Corrosion:DL80TS/DL80TSS\DL90TS/DL90TSS\DL95TS/DL95TSS\DL110TS/DL110TSS
Features:
According to the development of oil and gas wells, Dynoland's collapsing series casing has the following characteristics: Diameter is round and oval is little----- oval≤ 0.5%
Thickness is high accurate and distance is little ---- the same cross-section inequality is ≤ 9.5%
Strength is high and performance is steady - Heat treatment is by quenching and tempering
Low residual stress
Applications:
·Deep and super deep well
·To separate rock salt layer and soft layer
·Well with the H2S Corrosion condition

Ⅱ. High and super high strength casing series
Self-development:
Q125, DL130, DL140, DL150, DL155 Series
Features:
High impact toughness; 
Testing inside / outside surface of vertical / horizontal L2 level, 100% of WT test; Fitting and pipe body have high strength, and to ensure the internal pressure, external collapse resistance and the overall connection performance well.
Application:
Mainly used for deep and super deep oil and gas exploitation.

Ⅲ. Anti-corrosion oil casing series
Self-development:
Anti-H2S Corrosion OCTG Series: DL80S, DL90S, DL95S, DL110S
High Anti-H2S Corrosion OCTG Series: DL80SS, DL90SS, DL95SS,        DL110SS
Low Cr anti-CO2 Corrosion OCTG Series: DL90-3Cr, DL95-3Cr, DL110-3Cr, DL125-3Cr
Low Cr anti-CO2+H2S Corrosion OCTG Series: DL80S-3Cr, DL90S-3Cr, DL95S-3Cr, DL110S-2Cr
Low Cr anti-CO2+High Anti-H2S Corrosion OCTG Series: DL80SS-3Cr, DL90SS-3Cr, DL95SS-3Cr
High Cr anti-CO2 Corrosion OCTG Series: DL80-13Cr, DL110-13Cr
High Cr anti-CO2+H2S Corrosion OCTG Series: DL80S-13Cr, DL110S-13Cr
Features:
Steel purity - P ≤ 0.010%, S ≤ 0.006%; 
Performance is steady - all cross-sectional area of steel after quenching can receive more than 98% marten site, there will be fine even tempered sorbite organization after tempering
Stress corrosion - to eliminate residual stress, surface corrosion of the structure to form one or several atomic layer of the high stability of alloy corrosion resistance group content of oxide film
Homogeneous - grain size ≥ 8 level, uniform hardness; 
Applications:
·Wells with CO2 corrosion condition.
·Wells with CO2+H2S corrosion condition
·Wells with CO2+H2S+Cl- corrosion condition

Ⅳ. Heavy oil thermal recovery pipes
Self-development:
DL80H, DL100H, and DL110H Series

Features:
Performance of tensile under short-time high temperature condition is high. The decline of the performance is little with the temperature rising.
Applications:
Used for prolonged heat exploitation under 350℃ working temperature,

Ⅴ. Perforating gun barrel
Self-development:25Mn2V, 30CrMo, 32CrMo4 Series
Features:
High precision control of product size, performance and stability
Applications:
Used for the manufacture of oil and gas well perforating gun body.
R & D situation:
Perforation barrel projects are used 25Mn2V, 32CrMo4 (30CrMo) material for trial, the results after testing, performance, size, testing are in line with set requirements

Ⅵ. Water Injection Pipe
Self-development:
Low Cr anti CO2, Anti-H2S corrosion of water injection oil casing series

Applications:
R & D situation:
Dynoland's water injection pipes have been successfully tested. The evaluation of test performance can meet the requirements of the conditions for sale

Ⅶ. Anti- H2S corrosion line pipes
Product standards, steel grade:
Standard: API SPEC 5L\ISO3183\GB/T9711
Steel Grade:L245NCS\L290NCS\L360NCS\L290QCS\L360QCS\L415QCS\L450QCS
Features:
According to the development needs of oil and gas wells, Chang Po H2S corrosion resistant line pipe has the following characteristics:
Pure steel, in which: P ≤ 0.015%, S ≤ 0.003%; performance and stability, the composition of the uniform

Applications:
Transportation of oil and gas with H2S corrosion condition.

Ⅷ. Premium connection series
Self-development:
DL-T series, DL-V series, DL-H series ,DL-J series equivalent to Tynaris-Hydril series, vam series,Hunting series and JFE series.