Tungsten plated sucker rod

Abstract: In order to effectively solve the eccentric wear corrosion of oil wells with high water cut. Problem Tungsten-plated sucker rods were developed. The sucker rod adopts tungsten alloy electroplating technology for anti-corrosion treatment and has a hardness

High, good wear resistance, acid, and alkali corrosion resistance, low friction coefficient, etc. features. The tungsten-plated sucker rod technology is now in oil fields, Dongxin, Gudao, Chunliang and other oil production plants applied 359 well times. Prolong the production cycle of the oil well Obvious anti-corrosion, effect Remarkable economic benefit Has promotional value.

1. Tungsten-plated sucker rod technology

Corrosion and wear of pipe rods in oil field is becoming more and more serious. At the same time. The phenomenon of sucker rod breakage is increasing year by year. The annual workload of oil well maintenance Increased substantially. Aiming at the problem of corrosion and wear of pipe rod research has anti-wear. New pipe and rod technology with anti-corrosion properties. Exempt from maintenance for oil wells with extended eccentric wear. Period saving operating costs and pipe and rod input costs have significant realities practical meaning.

In view of the corrosion fatigue fracture of common sucker rod in Wells with high water cut and high mineral content a new material for anti-abrasive sucker rod was studied. The anti-corrosion tungsten alloy with anti-corrosion effect was electroplated on the surface of common sucker rod and polish rod to form tungstenized anti-wear and anti-corrosion sucker rod.The technology obtained the national utility model patent (ZL200620115595.6).

Tungsten sucker rod technology by increasing chromium, manganese content reduce carbon content adjust copper, titanium and other trace elements from raw materials to improve the overall corrosion resistance of sucker rod, which can fundamentally solve the corrosion fatigue fracture problem of sucker rod.

Tungstenized alloy plated uniform surface finish of up to 0.2 ~ 0.4μm can effectively reduce the internal tubing coarse surface, corrosion surface caused by the regional turbulence. Excellent wear resistance under dry friction and oil lubrication. Under the condition of oil boundary lubrication friction coefficient is low; Under the same friction conditions wear amount is smaller than that of chromium plating has a good protection against bias wear of the pipe and rod. It has strong corrosion resistance to corrosive media such as hydrogen sulfide, carbon dioxide and salt water. Tungsten-impregnated alloy rod can adapt to 100℃ high temperature Wells especially for high temperature oil and gas Wells remarkable effect.

Indoor tests show that: After 240 hours of continuous testing, tungsten-impregnated rod material has 249 times less corrosion speed than 20GrMoA rod material. Through the anti-corrosion sucker rod material and 20GrMoA sucker rod electron microscope analysis of the sucker rod material after corrosion shows that: the surface quality of the anti-corrosion sucker rod Much better surface quality than 20CrMoA Visible anti-corrosion effect.

2. Field application

Tungsten plated sucker rod technology has been in operation since September 2006. The first underground well is SDB308X1 of Binnan Oil Production.It has been applied in Xianhe, Dongxin, Gudao, Chunliang and other oil production plants. A total of 359 Wells were supported by an average production cycle of 120d before treatment. The production cycle of 269d after treatment is extended by more than 1 times. Dongxin Oil Production Plant of Shengli Oilfield due to deep pump hanging, high water content, high salinity, deviated wells, and directional wells are often oil wells with serious eccentric wear. Before treatment, HW anti-wear straightening rod and other technologies overall extended off-wear well. The production cycle is only about 30d the effect is not very obvious. After tungsten impregnated sucker rod matching technology average working period from before treatment.The 146d extends to 253d and has been producing normally effective.

3. Conclusion

Tungsten-plated anti-corrosion sucker rod has high hardness, good wear resistance, Acid and alkali corrosion, low friction coefficient and other characteristics

This technology is used in Shengli Oilfield. Field application of 359 wells in Xianhe, Dongxin, Gudao, Chunliang and other oil production plants. For the second time, the effect of prolonging the production cycle of the oil well by more than 1 times was achieved. More than 400 well times less operation Significant economic benefits.

The new technology of anti-wear and anti-corrosion sucker rod was successfully developed for pumping unit.

The problem of eccentric wear and corrosion of well pipe and rod provides a good performance and construction method.

Convenient new technology series for anti-eccentric wear treatment Plated tungsten plated sucker rod can instead of ordinary sucker rods, it is used in all kinds of eccentric wear and corrosion oil wells, so it has broad application prospects and high promotion value.