Mechanical oil recovery method and system with a sucker rod pump
AssigneesChina Petroleum & Chemical Corporation, Jiangsu Oil Field Branch of China Petroleum & Chemical Corporation
InventorHaijin Zheng
Life of this patent
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Abstract
This invention relates to a mechanical oil recovery method and system with a sucker-rod pump. The method calculates the lowest power loss or the lowest cost. The method comprises sequentially arranging internal diameter, steel grade of rod, pump diameter, pumping depth and stroke amplitude, searching the combinations of rods to calculate pump efficiency and the number of strokes, on the basis of Pinput=Pactive−Pexpansion+Ploss, and calculating, corresponding to the input power Pinput, active power Pactive, expansion power Ppeng, ground power loss Pd, sliding power loss Ph and viscose power loss Pv and the sum of losses Ploss. The mechanical oil-recovering cost is then calculated for each combination, and each mechanical oil-recovering parameter is chosen.
Claims18
A method of mechanical oil production with a sucker-rod pump, comprising:
- (a) predicting the objective daily liquid production, water cut, and dynamic fluid level of an oil well;
- (b) measuring degasified crude oil viscosity on the ground and wax precipitation temperature of crude oil;
- (c) acquiring physical parameters of formation crude oil in the oil well;
- (d) measuring oil middle layer temperature and earth surface temperature;
- (e) selecting the type of a beam pumping unit;
- (f) preliminary determining the ranges of oil tube diameters, oil tube length, diameters of the deep well pump, pump setting depth of the deep well pump, material type of the sucker-rod, rod string, and strokes and pumping speeds of the beam pumping unit;
- (g) finding out all combinations of different pump diameters, pump setting depths, tube diameters, rod material types, rod strings, strokes, and pumping speeds, which can achieve the same daily liquid production, then calculating out input power Pinput respectively corresponding to each parameter combination according to following formula:
- Pinput=Pactive−Pexpansion+ΣPloss
- where:
- Pactive is active power (W);
- Pexpansion is expansion power (W) caused by crude oil degasifying in oil tube above the pump standing valve;
- Ploss is total loss power;
- (h) taking the combination of parameters corresponding to minimum Pinput as the system parameters of mechanical oil production, or taking the one corresponding to minimum cost of mechanical oil production as the parameters of the machinery system of oil production;
- (i) deciding oil tube specification and length based on tube diameter and pump depth, deciding the specification of the deep well pump by pump diameter and stroke, and deciding specification and length of required each type of the sucker-rod by material type and structure of the sucker-rod;
- (j) deciding the type of the motor based on input power and pumping speed so that the oil production system can be established by the specific beam pumping unit, the motor, the oil tubes, the sucker-rods as well as the deep well pump.
A system of mechanical oil production with a sucker-rod pump, including a beam pumping unit, a motor, tubes, rod string and a deep well pump;
- said motor being fitted on the beam pumping unit and driving the latter, the sucker-rod being positioned in said oil pumping tube, said beam pumping unit being connected with the sucker-rod by a jointer, and the sucker-rod being conjoined with the plunger of the pump submerged under the liquid level, the operating cylinder of the pump being connected with said oil tube;
- wherein structure parameters of individual components in the system are selected as follows:
- (a) selecting the type of the beam unit based on objective daily liquid production, water cut, and dynamic fluid level of the oil well;
- (b) preliminary determining the ranges of tube diameters, tube length, diameters of the deep well pump, pump setting depth of the deep well pump, material types of the sucker-rod, rod string, length of each rod, strokes and pumping speeds of the beam pumping unit in the machinery system of oil production;
- (c) finding out all combinations of different pump diameters, pump depths, tube diameters, rod material types, rod strings, strokes, and pumping speeds, then calculating out input power Pinput respectively corresponding to each parameter combination according to the formula listed below:
- Pinput=Pactive−Pexpansion+ΣPloss
- where:
- Pactive is active power (W);
- Pexpansion is expansion power (W) caused by crude oil degasifying in oil tube above the pump standing valve;
- ΣPloss is total loss power
- (d) taking the parameter combination corresponding to minimum Pinput as the system parameters of mechanical oil production, or taking the one corresponding to minimum cost of mechanical oil production as the system parameters of mechanical oil production;
- (e) deciding oil tube material type and length based on tube diameter and pump depth;
- (f) deciding the type of the motor coupled with the beam unit by defined pumping speed and system input power so that the machinery system of oil production can be established by the special beam unit, the motor, the oil tubes, the sucker-rods, and the pump.
Dependencies are inferred from the claim text.