The following table shows the basic parameters of our polished rods.

According to different requirements, we can also provide special polished rods and pony rods.

According to API 11B standard, strength grade means different tensile strength and yield strength in physical performance. Shengji Petro can manufacture both common strength sucker rod, including C, D, K, KD, and high strength sucker rod including H and KH grade.

The basic structure and working principle of high-strength sucker rod are not fundamentally different from ordinary sucker rod. However, compared with common grade sucker rod, high strength sucker rod shows higher tensile strength grade, bearing capacity and performance.

Oil wells prone to corrosion and wear usually mean acidic working environment, so sucker rods should have excellent anti-corrosion and anti-wear properties. In order to deal with relevant problems, Shengji Petro has designed and manufactured various special sucker rods, such as tungsten plated sucker rods, composite plated sucker rods and coated sucker rods. They all have good anti-corrosion and anti-wear properties and can be selected according to different conditions.

Welcome to consult and determine which special sucker rod is most suitable for you!

The main operating parameters of metering pump include flow range, medium discharge pressure, medium delivery temperature and viscosity.

The metering pump generally works as a single unit, or can be combined with other pumps. The flow range of our single pump is 0.2~16000L/h, and the maximum discharge pressure is 100MPa. Suitable medium temperature: plunger pump – 50 ℃~350 ℃, diaphragm pump – 30 ℃~280 ℃, medium viscosity 0.3mm ²/ s~10000mm ²/ s.

The metering pump of Shengji Petro can be stepless adjusted within the range of 0~100% stroke to meet the requirements of different flows. Within the range of 10% – 100%, the flow stability accuracy can reach ± 0.5%

According to Chinese national standard GB/T 7782 Metering Pump, the flow metering accuracy of the pump under rated conditions and at the maximum relative stroke length shall not be less than ± 1%.

Yes, our company has passed ISO 9001, ISO 14001, APIQ1, NOV and other quality certification systems.

SANJACK PETRO has an R & D center and a national-level laboratory with a team composed of domestic authoritative professors and senior engineers to provide users with high-performance and practical products. Excellent product quality and scientific management system are always our unremitting pursuit

We usually adopt the following three methods.

1. Change the stroke length of the plunger (diaphragm) of the pump (the optimal relative stroke length is 30%~100%), and the regulation can be carried out during shutdown or operation.
2. Use a frequency converter to change the input power frequency to adjust the pump speed, or install an intelligent stroke controller and a digital controller to facilitate automatic control and computer program control of flow regulation. 3. The stroke adjustment and frequency conversion are in parallel to expand the effective adjustment range of the pump.

Diaphragm metering pump is recommended when measuring unconventional liquid. The hydraulic end and the power end are separated safely through the diaphragm to ensure zero leakage of the medium. It is suitable for conveying flammable, explosive, highly toxic, precious and other liquids.

Clients can also choose double diaphragm metering pump with diaphragm rupture alarm device to further improve the level of prevention and ensure safety.

The problem of acid corrosion is usually caused by dissolved oxygen, CO₂ and H₂S in drilling fluid. Generally, the following two methods are adopted.

One is to use more corrosion resistant material as drill pipe body, such as Aluminum and titanium, to replace common alloy steel or stainless steel.

Another is to apply proper surface treatment to drill pipe, such as tungsten plating and composite plating technology.

The spiral drill collar is made of three right spiral grooves on the outer cylindrical surface of the round drill collar. A section of round drill collar without spiral groove is reserved at the joint part of external thread end and the joint part of internal thread end, so as to facilitate the connection and removal operation and thread repair. In addition, its weight is 4 to 6% less than that of round drill collars of the same size.

In directional drilling, due to the large inclined well and the large contact area between the drill collar and the well wall, it is easier to stick the drill. The spiral drill collar reduces the contact area with the well wall and can effectively reduce the possibility of differential pressure block, so it is widely used.

When the magnetic measuring instrument is measuring the direction of the borehole, it induces the geomagnetic field of the borehole, so the measuring instrument must be in a nonmagnetic environment. However, in the process of drilling, the drilling tools are often magnetic, which will affect the magnetic measuring instruments, and cannot obtain the correct well trajectory measurement information data.

The non-magnetic drill collar is made of low chromium manganese alloy steel. It has good hardness, toughness, impact value and corrosion resistance. What’s more, it owns low magnetic permeability. Therefore, the non-magnetic drill collar is mainly used for monitoring during oil drilling.