Your Reliable Manufacturer For
OCTG Tubing and Casing
Sanjack, as the Professional OCTG Tubing & Casing manufacturer, established OCTG Tubing & Casing production line in 1995 and the first EUE OCTG Tubing & Casing production line in China in 2000, as well as obtained API 5CT Certificate in the same year. Sanjack special OCTG Tubing & Casing can effectively solve the difficult problems in oil recovery such as corrosion and wear of oil tubing, scaling of water injection well, heat preservation in steam injection, which also have the best price/performance ratio in China.
we supply OCTG Tubing and Piping, such as OCTG Tubing, OCTG Casing, Vaccum insluation tubing and casing, Precision rolling pipe, Anti-corrosion and anti-wear tubing. Our OCTG Tubing and Casing are reliable and have very good quality. If you are looking for OCTG manufacturers, and vacuum insulated tubing suppliers, we are your best choice Sanjack Petro is a real manufacturer of OCTG pipe, Contact Sanjack for a quick quote.
Why Sanjack Petro Exported
- Sanjack has 30+ Years of OCTG Tubing & Casing Manufacturing Experience.
- Sanjack has 20＋ years of experience in EUE OCTG Tubing & Casing.
- Sanjack has 20 years of API 5CT OCTG Tubing & Casing experience.
- Sanjack special OCTG Tubing & Casing can effectively solve the difficult problems in oil field production such as corrosion and wear of oil tubing, scaling of water injection well, heat preservation in steam injection.
- SanJack OCTG Tubing & Casing has the best cost performance ratio in China.
How We Control Quality
Sanjack Petro owns world-class laboratories which align with API
Commonly Asked in Some Context
For oil well with content H2S, we normally select the material S or SS grade, for example, L80S and L80SS. And for oil well with content CO2, we normally select the material added chromium, for example, L80-13Cr, or higher grade
GOST Standard Technical Requirements
1). Pipes and couplings shall be produced pursuant to the requirements of this Standard and production schedules approved in accordance with the established procedure.
2). No skins, blisters, laps, delaminations, cracks and dumbs shall be on the outside and internal surfaces of pipes and couplings. Chipping and stripping of these defects is allowed provided that their depth does not exceed maximum negative deviation for wall thickness. Patchwork, calking or embedding of defective places is not allowed. In places where the wall thickness may be measured directly, the depth of defective places may exceed the value specified in this clause, provided that the minimum wall thickness is preserved, determined as a difference between the nominal pipe wall thickness and its maximum negative deviation. Minor dints, nicks, grooves, thin layer of scale and other defects, due to the production process, are allowed, provided that the wall thickness in this case does not go beyond the maximum negative deviations.
3). Junction of the upset part of pipe ТБО female end to its part with the wall
thickness s shall have no abrupt ledges. The defects specified in clause 2.2 are not allowed on a surface with diameter Dн at the length lв min from the pipe end. There shall be no more than three defective places (e.g. underfilled with metal and defects repair), each one extending lengthwise circumference by no more than 50 mm, with the width of no more than 20 mm and depth of no more than 2 mm on external and internal surfaces of the upset part of pipe female end at the distance above lв min from the pipe end. Wall thickness in a junction part of pipe female end shall be no less than minimum allowable wall thickness of the pipe plain part. 4). The mass fraction of sulfur and phosphorus in steel shall not exceed 0.045 % each.
5). Pipes and couplings shall be produced from steel of strength group specified in table 7.
6). Pipes and couplings shall be produced from steel of the same strength group. It is allowed to produce pipe with couplings made from steel with higher mechanical properties. At the customer’s request, the special couplings with decreased outside diameter to pipes ОТТМ and ОТТГ shall be produced from steel of subsequent groups of strength with higher mechanical properties.
7). Pipes and couplings to them of strength group K and higher shall be subjected
to thermal or thermo-mechanical treatment. Pipes ТБО of all groups of strength shall be subjected to thermal treatment after female end upset.
8). Pipes shall pass the test for flattening. The distance between parallel planes after test shall not exceed that specified in table 8.
9). Thread and tightening tapered bores of couplings shall be zinc-coated or
10). Each pipe with triangular thread (ОТТМ and ОТТГ) shall be equipped with a
coupling fixed on coupling-screwing tool on one of its ends. When screwing pipes and couplings, a lubricant or others sealants, ensuring tightness of connection and preventing it from corrosion and scoring, shall be applied.
11). With the purpose of corrosion prevention, the external surface of each pipe and coupling shall be painted at the customer’s request.
12). Pipes with screwed on couplings, and also inserted-joint pipes shall pass the test under internal hydraulic pressure.
2), And we have a complete quality management system complying with the requirements of ISO and API. More details about the quality, we maintain the very strict QC procedures.
3), Any procedure during the production or before the delivery from the plant, we accept the inspection of any third party Institute as the client’s requirement.
(1) MTC (Mill Test Certificate) and other inspection report documents including hydrostatic report, physical and chemical examination report, thread inspection report, etc., in any language version as the client’s requirement. What’s more, according to the client’s need, we can also invite any worldwide famous third party to realize the inspection and emit the TPI report, for example, BV, SGS, DNV, or other TPI inspection report.
(2) TALLY SHEET indicating all tubing or casing information including size, unit weight, unit length, total length, bundles, qty/ bundle.
(3) We provide any necessary documents for the destination customs clearance, and other documents to help the client get the country’s preferential policy.
It requires by standard SY/T5324-2013: for old VIT after steam injection, when its thermal conductivity is greater than 0.1W/ (m·℃), It will be regarded failure.
Besides quality issue, it is mainly caused by work environment, such as high sulfur wells where pipe body and weld are corroded much higher than that in normal wells. Therefore, we recommend that customers provide detailed information of the status of the wells. According to well data of clients, we can design special VIT.
When used in well of steam stimulation, service lifespan should be 30 stimulation cycles at least.
When used in well of steam driving, service lifespan should be 24 months at least.
In warranty, SJ will change failed products free for client after receiving formal Nonconformity Report from Third Party if failure caused by quality issue of product happens.
Out Warranty, SJ also is willing to support client to solve product failure issue if client has any requirement, but cost will be covered by client.
But mostly, condition of each well is different, such as corrosion media, injection media, well temperature and Length of tubing string, which will affect failure and warranty of vacuum insulated tubing and casing..