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Successful Application of PCM Large Displacement Screw Pump in China Oilfield
China is currently the second-largest oil consumer and the seventh-largest oil producer globally. To minimize production costs and maximize shareholder value, the country's three major oil and gas companies—PetroChina, Sinopec, and CNOOC—are actively seeking cost-effective solutions. In this context, France-based PCM Pump North Asia Manager Ma Jian and Technical Director Wu Bingchang shared insights with Daqing Oilfield on the use of large-displacement PCM Screw pumps.
Figure 1: Field PCM screw pump
Since the 1980s, China has been developing screw pump technology, but it wasn't until 2000 that these pumps started to see widespread application in major oil fields. The main objectives of using screw pumps include reducing production costs, especially electricity expenses, which account for nearly 46% of oil production costs according to PetroChina. Additionally, they help address challenges such as heavy oil cold mining, high sand content, and high gas wells.
However, domestic screw pumps face several issues, including sucker rod fractures, low displacement, and unstable pump cycles. These problems are often attributed to design limitations, poor stator quality, and inadequate rotor variety.
In December 2003, PCM's 600TP600 screw pump was introduced at Daqing Oilfield, marking the first time a foreign-made screw pump was used there. The goal was to replace traditional rod pumps and reduce well production costs. Using WINPETRO software, Daqing selected the 600TP600 model (500 rpm, 600 m³/day output, 600-meter lift). To cut initial costs, PCM paired it with a domestic drive head and a 22 kW motor.
Initially, the pump operated at 130 m³/day with a 55% efficiency, which customers attributed to pump quality. A stator adaptability test was conducted by sending 500 ml of well fluid to France. Results showed a +2.2% expansion coefficient and a 4-point decrease in hardness, indicating good compatibility.
After a few months, the pump’s performance improved significantly, reaching 200 m³/day with 77% efficiency. As of April 2006, the well had operated for 840 days, with an estimated operational life of over one year. When efficiency drops below 50%, PCM plans to upgrade to a larger rotor, further enhancing efficiency and extending stator life.
A comparison between the PCM 600TP600 and China's largest displacement screw pump revealed significant cost savings after two years: 21,000 yuan (rod cost) + 25,000 yuan (operating cost) + 41,000 yuan (power consumption) = 87,000 yuan saved. Moreover, daily oil production increased by 19.5 m³, generating approximately 5.7 million yuan in benefits.
In a neighboring well, a Chinese GBL800-14 screw pump with similar theoretical displacement was installed. Comparisons in Tables 3 and 4 highlighted the advantages of PCM pumps in terms of efficiency, maintenance, and longevity.
In conclusion, PCM screw pumps offer long-term benefits by reducing maintenance and operating costs, lowering energy consumption, and increasing economic returns. Their advanced stator formulas and optimized rotor designs contribute to higher efficiency and extended operational cycles, ultimately cutting production costs for oilfields.
Figure 1: Field PCM screw pump
Figure 2: 600TP600 Screw pump output curve
Figure 3: Application of PCM 600TP600 in Venezuela
Figure 4: Application of PCM 600TP600 in Shengli Oilfield
Table 1: Basic Data Sheet of Well
Table 2: Parameter Table of PCM Screw Pump
Table 3: Comparison of Two Screw Pumps
Table 4: Comparison of Two Screw Pumps of the Same Theory at Home and Abroad