In recent years, with the deterioration of the security environment in the oil area, illegal activities are increasingly rampant, single well and mixed pump lines are drilled and stolen oil phenomenon occurs frequently. Because screw oil pump has the characteristics of large suction and good stability, it is very suitable for offshore oil production far from land. During the "ninth five-year Plan" and "tenth five-year Plan", the number of "longevity" screw oil pump Wells in Chengdao offshore increased year by year. Suitable for both onshore well production and offshore production requirements far from land. With the deepening of the understanding of screw oil pump production technology and the improvement of operation technology, the screw oil pump production technology in Chengdao oilfield has been gradually complete. Therefore, if we want to cut off this "cancer", we must start from changing the way of emptying. The "long life" (long free period) of screw oil pump Wells in Chengdao oilfield has become a common phenomenon, which has laid a solid foundation for the improvement of oil production rate and the increase of production. According to statistics, there are 36 Wells whose free period of screw oil pump Wells in Chengdao oilfield exceeds 2 years (802 days), and 16 Wells whose free period of screw oil pump Wells exceeds 3 years (1098 days). There are 9 Wells with exemption period of more than 4 years (1466 days), and 1 well with exemption period of more than 5 years (1826 days), which have made outstanding achievements in the leap-forward growth of crude oil output of Shengli Oilfield, and also provided reliable guarantee for the sustained and stable development of the oilfield during the tenth five-year Plan period. In the process of oil and liquid lifting, it has the characteristics of large pumping force, high pressure, strong pumping effect, good stability and low shear force. It is an excellent self-priming oil pump. Since the ninth five-year Plan, the technicians of Shengli Offshore Oil development Company have reasonably introduced the advanced screw oil pump production technology and popularized it in a large area in combination with the underground dynamic and production characteristics of Chengdao oilfield. Through the extraction test of large displacement screw oil pump, the "water-controlled and oil-stable exploitation mode" is changed into "large displacement extraction mode". By optimizing the technical parameters, the production time rate of oil well is improved and the potential of bottom water reservoir is fully tapped. In the operation of oil, gas and liquid extraction, it plays an important role in security and theft, environmental protection, production and efficiency, and is favored by mine operators. Through six years of field practice and operation, the company's technical staff has improved implementation the hollow rod screw pump, three screw pump, screw pump variable frequency soft start technology measures such as technology, formed a relatively perfect process of oil production in offshore screw pump system, presented the sea "longevity" good situation of screw pump production increased year by year.
1. Screw oil pump boosts security and anti-theft, protecting the environment
Large displacement screw pump, the long screw pump is adopted to extract, with large displacement, high pressure, low shear force characteristics, suitable for large displacement with the needs of the oil solution, can effectively solve the sucker rod is easy to break off and the pump depth control problem, also can maintain a constant differential pressure stability and fluid volume, and oil supply volume, the dynamic balance of can make oil well productivity to the full play. Through the analysis of engineering and geological technicians, it is believed that the main reason is the defect of venting mode.
In the first mine of Linpan oil Production Plant of Shengli Oilfield, the screw oil pump was put into production as a "vent pump", and more than 1500 tons of oil were recovered in only one year, with economic loss of 2.8 million yuan.
Shengli Xianhe oil production plant boldly uses screw oil pump to extract liquid for exploitation, and has achieved obvious production increase and efficiency improvement.
2. Screw oil pump highlights production and efficiency
Screw oil pump is an advanced new technology of mechanical oil recovery in the present oilfield development. And "taste the sweet" lawless element is driven by economic interest, can more frequently pilfer cut pipeline. Caogu 1 block is one of the main upper production blocks of Anle Oilfield. With years of rapid development, the "burst" flooding of oil Wells caused by bottom water is becoming increasingly prominent, and the effect of conventional exploitation methods and compound plugging on treating bottom water is getting worse year by year.
. In the past, when the pipeline was destroyed by illegal elements, the small crew simply drained the crude oil into the empting pool, which made the landing oil impossible to be recovered, and was severely robbed by illegal elements. The polluted area was larger, and it was not conducive to the management of the measuring station. In addition, the change in the method of emptying has effectively reduced the occurrence of sabotage by blocking the "financial resources" of illegal oil thieves.
After the application of this technology, the loss of crude oil caused by drainage and environmental pollution are reduced, the pipeline maintenance progress is accelerated, and the oil well time rate is improved.
