OCTG casing

Anson also have much experience on supply casing pipes, which will be best rate and international certificated quality. Casing is large diameter pipe that is assembled and inserted into a recently drilled section of a borehole and typically held into place with cement.

 With the casing set depths determined, hole sizes and casing sizes must follow. The hole drilled for each casing string must be large enough to easily fit the oil well casing inside it, allowing room for cement between the outside of the casing and the hole.

Casing design for each size is done by calculating the worst conditions that may be faced during drilling and production. Mechanical properties of designed pipes such as collapse resistance, burst pressure, and axial tensile strength must be sufficient for the worst conditions.

Application of OCTG casing:

In the planning stages of a well a drilling engineer, usually with input from geologists and others, will pick strategic depths at which the hole will need to be cased in order for drilling to reach the desired total depth. This decision is often based on subsurface data such as formation pressures, strengths, and makeup, and is balanced against the cost objectives and desired drilling strategy.

Specifications of oil well casing

Dimension range(OD inch)：4 1/2”---30”
Dimension range(OD mm)：114.3---762　　
Standard: API SPEC 5CT
Main Steel Grade: H40, J55, K55, N80, N80Q, L80, T95,  P110 etc
Type of Casing：Plain, BTC, STC, LTC, Other Premium Thread.

* P - plain end, S - short round thread, B - buttress, L - long round thread.

Please follow us to know how the casing pipes produced as below details:

Productive process of OCTG casing pipe

• 1. Ingot heating
• 2. Perforation
• 3. Rolling and sizing
• 4. Coolin
• 5. Straightening
• 6. NDT, UT
• 7. End cutting
• 8. Coupling thread (premium thread available)
• 9. Hydrostatic test, x-ray test.
• 10. Painting and thread protecting
• 11. Packing

Workshop	Raw materials
Ingot heating	Hot rolling
Plug mill	Cooling
Cutting	Threading
Painting	Hydraulic pressure

Oil well casing quality assurance

Our mill has built a complete and effective quality system under ISO9001. With the approval of American Petroleum institute, our mill is awarded with API5 CT certificate.
Casing pipes we offered conform to international standard API/ EN/ ASTM, and can pass any third party’s inspection like SGS, BV. In order to assure compliance to applicability terms, we inspect the pipes through a set of proven tests & inspections including: dimensional inspections, tensile test, corrosion test, non-destructive test, hydrostatic test, x-ray test.