Development of a New Type of Oil Pump

Li Shufang, Cong Hongliang (Linpan Oil Production Plant, Shengli Oilfield Co., Ltd., Linfen 251507, Shandong, China) According to the difficulties in production, XFB anti-adverse grinding thickening pump was successfully developed. The pump has the following characteristics: 1 anti-bias grinding; 2 is suitable for heavy oil wells, high oil and gas ratio wells and high inclination wells; 3 to improve pump efficiency characteristics; 4 on-site operation characteristics. 45 wells have been applied in the field, successfully solving the problem of effectively extending the maintenance period of wells in the case of partial wells with less investment, and successfully solving the problems of low cost, high pump efficiency in heavy oil wells, high oil and gas ratio wells, and high inclination wells. The problems of production have achieved good economic and social benefits and have broad application prospects.

Pumping pump; anti-offset grinding; thickening; pumping; more than 4,000 wells with eccentric rods in Shengli oil field with high inclination, accounting for about 30% of pumping wells, due to tubing, sucker rod bias The amount of work caused by grinding accounts for 20% and 30% of the total maintenance workload of oil wells, resulting in great waste of manpower and material resources. Due to the fact that the annual scrap rate of oil pipes and sucker rods is more than 10%, the direct economic losses caused by partial wells in Shengli Oilfield exceed RMB 100 million each year. With the gradual development of difficult-to-use reserves, heavy oil wells, high gas-to-oil ratio wells, and high-angle wells have become increasingly common, and ordinary Verrell type oil pumps are inefficient in these wells. In order to effectively solve the production problems mentioned above, the Linpan Oil Production Plant conducted a bold exploration and successfully developed a XFB anti-adverse grinding thickening pump.

1Structure and working principle 1.1 Structure XFB anti-adjustment grinding Thickness pump is a tubular pump, pump cylinder and fixed Verre assembly and ordinary tubular pump ((a))-like, processed by seamless steel tubes The inner surface is carburized or nitrided. See (b) for a schematic diagram of the structure. The pump piston assembly consists of a two-stage plunger, a two-stage mechanical valve seat, a connecting rod assembly, and up-and-down stabilizers. Among them, the movable valve and seat cooperate with the common oil pump Vernier and Versail. The structure of the seal, up and down righting body is mainly used to straighten the main plunger; the role of the main plunger with the ordinary pump, with the pump tube to form a seal with the Vice; auxiliary plunger and the pump tube to form a pair, the role of one is Another seal joint is formed and the main plunger is protected.

1.2 Working Principles (a) Common Pump (b) Anti-Abrasion Anti-Aliasing Thickening Pump Suction Pump Structure Diagram In the up stroke, the sucker rod column is driven upward by the donkey head, and the main plunger and the auxiliary plunger are relatively downward. Movement, the movement valve is closed, at this time, the wellhead discharges the oil; under the action of the donkey head, the sucker rod column moves downwards due to the relative movement between the plunger and the sucker rod, and the movement valve opens. At this point, the well fluid enters the wellbore.

Since the mechanical valve does not have the problem of pressure opening, the sucker rod is always under tensile stress during the entire working process in terms of the stress state of the sucker rod string. The sucker rod string has no stroke loss and will not be lost. Steady bending, sucker rod and tubing will not wear out; for the pumping of wells in the liquid, the higher viscosity, gas and oil wells, can increase the pump fill factor, improve pump efficiency.

The 2 function XFB anti-bias grinding pump has the following characteristics due to its structural characteristics: Li Shufang (1972-), female, graduated from university in 1994, master's degree, engineer, is mainly engaged in the research, promotion and application of mechanical oil recovery supporting technology.

21 Anti-offset grinding After using the XFB anti-deviation grinding thickening pump, the sucker rod column is no longer subject to semi-dry frictional force between the plunger and the pump cylinder and the force of the upward flow force to be overcome when the mobile valve is opened. . Sucker rods are always in tension and do not buckle.

Table 1 The load of the ordinary pump on the sucker rod upstroke at the downward stroke Pump Diameter/mm Upward Load/kg0382890443870565000701413 Table 2 Critical load for sucker rod instability instability Sucker rod specification /in critical destabilization load /kg3 /49.77/813.01168 It can be seen from the above analysis and the comparison between Table 1 and Table 2 that when the ordinary Verrell type oil pump is in the down stroke, the upward force acting on the sucker rod string is much greater than the sucker rod string. When the critical load of instability occurs, the sucker rod column must undergo instability and bending. The XFB anti-deviation wear thick pump in the down stroke, due to its structural characteristics to ensure that the downward force acting on the rod rod is always greater than the upward force, the rod rod has been working in tensile stress, No instability bend 121.22 Suitable for thickening, pumping, high angle wells Ordinary Verr pump only when the pressure inside the pump cylinder is higher than the pressure above the plunger Oil wells, high gas-to-oil ratio wells, and highly deviated wells have low pumping efficiency, and even appear to be moving. During the entire working period, Verrer is always in the closed state, and the output fluid in the pump cylinder cannot be discharged. XFB Anti-Offset Milling Thickness Pump The moving valve body is a mechanical valve that is forced open and does not require opening pressure.

23 Improving pump efficiency After using the XFB anti-deviation grinding thickening pump, there is no stroke loss due to the stroke of the sucker rod and loss of pulsation due to movement of the valve, which can improve pump efficiency.

24 On-site Operational Strong XFB Anti-Offset Milling Pumps do not have any special requirements for job construction and oil production management, and can achieve normal well flushing during oil recovery and smooth oil draining during operation.

3 Field application situation The use of more serious mouthwash, oil thick, high oil and gas ratio and high slope wells, a success rate of 100% after the success rate of 100% measures, an effective solution to the partial wells in the case of less investment to extend the well free maintenance During the period, the problem of the low-cost and high-efficiency mining of crude oil with a viscosity of 2000 mPa.s at a crude oil viscosity of 800C, a high oil-gas ratio well with a gas-oil ratio of 800 at the 50C, and a 60C high slope of the well at the downhole drilling section was successfully solved.

Tang 6 Xie 8 well is an eccentrically worn well. From 1999 to 2002, it worked 2 to 3 times a year. In October 2002, the XFB anti-adverse grinding thickening pump was inspected for pump operation. Only 10 centralizers were provided on the sucker rod, and no anti-deviation was provided on the tubing string. Grinding tools, continuous high-efficiency pumping operation for 1 year and 8 months, the well extended repair period extended 256d. Tian 18 Ping 3 wells are heavy oil wells. The production horizon is the second section of the hall, and the open section is 1676~1840m with a 164mA layer. At 50C, the viscosity of crude oil is 1580 mPas. After it is put into production, the pump is 056mm below normal and the pump is 800m deep. The stroke is 4m, and the pumping time is 2min- and no oil has been produced. The meter is thickened with XFB type anti-adverse thickening pump. The meter uses 056mm pump, the pump depth is 1000m, the stroke is 3m, the pumping time is 2min-1, the daily production volume 6 well is high gas-oil ratio well, and the gas-oil ratio is 563.2002. The rod pipe wear problem has been operated four times. The original well string has always been produced with a gas anchor. The daily liquid volume has been maintained at about 7m3, and the average pump efficiency is less than 20%. After using the XFB anti-bias grinding pump, the gas anchor is removed from the column, directly The anti-adverse grinding thickening pump is used for production. The initial daily output of the well is 25m3. After the normal production, the daily production volume has been maintained at about 16m3, and the pump efficiency has reached more than 50%.

XFB anti-offset pump is suitable for application in heavy oil wells, high gas-to-oil ratio wells and high inclination wells due to its own structural characteristics. With the increase of oil well water content and the necessity of liquid extraction in the later development of oil fields, the problem of eccentric wear of shafts and tubes with rod pumps will become more prominent; along with the gradual investment in the development of difficult-to-use reserves and the increasing number of large-angle wells such as sidetrack drilling The proportion of heavy oil wells, high gas-to-oil ratio wells and high-angle wells will increase. XFB anti-abrasive thickening pump has a larger application prospects.

Wan Banglie. Design and calculation of oil extraction machinery. Beijing: Petroleum Industry Press, 1998 Shen Dicheng. Suction pump. Beijing: Petroleum Industry Press, 2001.