Heavy oil lifting device
By designing a heavy oil lifting device consisting of a downhole pump, storage tank, heater, and downhole delivery pipe, and employing methods of heating to reduce viscosity and diluting to reduce viscosity, the problems of high energy consumption and uneven mixing in heavy oil lifting devices have been solved, achieving low-energy and high-efficiency heavy oil extraction.
Patent Information
- Application Number
- CN202520578343.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-31
- Publication Date
- 2025-12-23
- Estimated Expiration
- 2035-03-31
AI Technical Summary
Existing heavy oil lifting units have high energy consumption, poor viscosity reduction effect, and uneven mixing, resulting in low extraction efficiency.
Design a heavy oil lifting device, which consists of a downhole pump, a storage tank, a heater, and a downhole delivery pipe. By heating and diluting to reduce viscosity, the downhole delivery pipe surrounds the downhole tubing, and the bottom injection hole mixes with the heavy oil below the pump. Combined with temperature and flow control, uniform mixing is achieved.
It achieves low-energy consumption and high-efficiency viscosity reduction of heavy oil, improves the efficiency of extraction pumps, reduces the space occupied in the annulus, ensures the fit of downhole fluid delivery pipes, and improves the fluidity and extraction efficiency of heavy oil.
Smart Images
Figure CN223707604U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to oil and gas exploitation technical field, specifically speaking, relate to a kind of thick oil lifting device. BACKGROUND
[0002] Oil lifting refers to the process of lifting oil in reservoir to the ground, which is a key link in oil exploitation. With the exploitation of oilfield, under most reservoir conditions, the energy of oil itself is not enough to flow to the ground from the deep underground, so external force is needed to realize lifting.
[0003] Thick oil has high viscosity, and the flow resistance in the reservoir is very large, so two systems are needed when lifting thick oil. One is the mechanical system for lifting crude oil, mainly divided into rod pump lifting and rodless pump lifting. The other is a viscosity reduction system for reducing the viscosity of thick oil. Heating and viscosity reduction and dilution viscosity reduction are two common viscosity reduction measures. The former can be divided into electric heating viscosity reduction and high-temperature steam viscosity reduction, which has high energy consumption. The mixing effect of the latter is not easy to control, and factors such as temperature and flow rate may cause uneven mixing.
[0004] In order to solve the above problems, people have been seeking an ideal technical solution. SUMMARY
[0005] The utility model discloses to the deficiency of prior art, and thus provides a kind of thick oil lifting device with scientific design, lower energy consumption, good viscosity reduction effect and high exploitation pump efficiency.
[0006] In order to achieve the above purpose, the technical scheme adopted by the utility model is: a thick oil lifting device, comprising a downhole oil pump, a liquid storage tank, a heater, a delivery pump and a plurality of downhole liquid conveying pipes, the downhole oil pump is arranged in the downhole oil pipe, the liquid outlet of the liquid storage tank is communicated with the liquid inlet of the heater, the liquid outlet of the heater is communicated with the liquid inlet of the delivery pump, a plurality of downhole liquid conveying pipes are uniformly arranged outside the downhole oil pipe, the top end of a plurality of downhole liquid conveying pipes extends out of the oil well and is respectively communicated with the liquid outlet of the delivery pump through a liquid supply branch pipe, the bottom of a plurality of downhole liquid conveying pipes is arranged outside the bottom end of the downhole oil pipe, and a plurality of liquid injection holes are uniformly arranged on the side facing the center of the oil pipe.
[0007] Beneficial effects: the liquid tank is used for storing thin oil or water, after being heated by the heater, the thin oil or water is pumped into several downhole liquid delivery pipes by the delivery pump, the downhole liquid delivery pipes are arranged around the downhole oil pipe, the downhole liquid delivery pipes can heat the downhole oil pipe, the oil injection holes at the bottom end enclose a circle, so that the thick oil below the downhole oil pump can be mixed more uniformly, the device has the working principles of heating and viscosity reduction and mixing thin oil and viscosity reduction, the heating temperature does not need to be too high, and suitable temperature can make the thick oil mix better, better fluidity is realized, and the pumping efficiency is improved.
[0008] Based on the above, the downhole liquid delivery pipes are arranged in four, and the cross section of the downhole liquid delivery pipe is curved in an arc shape towards the center of the downhole oil pipe.
[0009] Beneficial effects: the cross section of the downhole liquid delivery pipe is arranged in an arc shape, the downhole liquid delivery pipe is more fitted to the outer wall of the downhole oil pipe, heat exchange is improved, and the annular space is reduced.
[0010] Based on the above, the downhole oil pipe outer wall is provided with a plurality of limiting rings corresponding to each downhole liquid delivery pipe, and the downhole liquid delivery pipe is arranged in the limiting rings.
[0011] Beneficial effects: the plurality of limiting rings can ensure that the downhole liquid delivery pipe is close to the downhole oil pipe, and displacement during operation is avoided.
[0012] Based on the above, the downhole oil pump is a long tube pump.
[0013] Beneficial effects: through experiments, when the thick oil in the Akesu oil field is operated, the average pumping efficiency of the long tube pump is higher, which is 66.6%; the average pumping efficiency of the liquid feedback pump is 60.2%, and the average pumping efficiency of the screw pump is 54.33%.
[0014] Based on the above, the downhole oil pump is provided with a temperature sensor, and each liquid supply branch pipe is provided with a flow sensor and a flow regulating valve.
[0015] Beneficial effects: the temperature sensor can conveniently monitor the oil temperature near the downhole oil pump, the flow sensor and the flow regulating valve can conveniently adjust the flow of each downhole liquid delivery pipe, and then the mixing ratio of thin oil and thick oil and the oil delivery temperature are controlled, and the mining parameters are adjusted to be more suitable. BRIEF DESCRIPTION OF DRAWINGS
[0016] Fig. 1 is a structural schematic view of a thick oil lifting device in the utility model.
[0017] Fig. 2 is an installation top view of a downhole liquid delivery pipe in the utility model.
[0018] Fig. 3This is a schematic diagram of the bottom inner structure of the downhole fluid delivery pipe in this utility model.
[0019] In the diagram: 1. Downhole pump; 2. Storage tank; 3. Heater; 4. Transfer pump; 5. Downhole delivery pipe; 6. Downhole tubing; 7. Casing; 8. Annulus; 9. Supply branch pipe; 10. Injection hole; 11. Limiting ring; 12. Flow sensor; 13. Flow regulating valve. Detailed Implementation
[0020] The technical solution of this utility model will be further described in detail below through specific embodiments.
[0021] like Figs. 1-3 As shown, a heavy oil lifting device includes a downhole pump 1, a storage tank 2, a heater 3, a delivery pump 4, and four downhole delivery pipes 5. The downhole pump 1 is installed in the downhole tubing 6, which is installed in the middle of the casing 7, and an annulus 8 is formed between the downhole tubing 6 and the casing 7.
[0022] The outlet of the storage tank 2 is connected to the inlet of the heater 3. The heater 3 can be an electric heater or a gas heater. The outlet of the heater 3 is connected to the inlet of the delivery pump 4. Four downhole delivery pipes 5 are evenly arranged around the outside of the downhole tubing 6. The tops of the four downhole delivery pipes 5 extend out of the well and are connected to the outlet of the delivery pump 4 through a supply branch pipe 9. The bottoms of the four downhole delivery pipes 5 extend out of the bottom of the downhole tubing 6 and are evenly provided with multiple injection holes 10 on the side facing the center of the tubing.
[0023] Working principle:
[0024] The storage tank 2 stores light oil or water. After being heated by the heater 3, it is pumped by the delivery pump 4 into four downhole delivery pipes 5. The four downhole delivery pipes 5 surround the downhole tubing 6, which can heat the tubing. The oil injection holes 10 at the bottom form a circle, which allows for more uniform mixing with the heavy oil below the downhole pump 1. This combines the working principles of heating to reduce viscosity and diluting to reduce viscosity. The heating temperature does not need to be too high; a suitable temperature can also allow the heavy oil to mix better, achieving better fluidity, which is more conducive to the pumping and delivery of oil by the downhole pump 1, improving the pumping efficiency. In other embodiments, a separator can also be installed on the surface to separate the heavy oil from the light oil / water, and the resulting light oil / water can be returned to the storage tank 2 for reuse.
[0025] In order to make the heating effect better, the cross section of the downhole liquid delivery pipe 5 is curved towards the center of the downhole oil pipe 6, and the fitting degree with the outer wall of the downhole oil pipe 6 is better; the outer wall of the downhole oil pipe 6 is provided with a plurality of limiting rings 11 corresponding to each of the downhole liquid delivery pipes 5, and the downhole liquid delivery pipes 5 are arranged in the limiting rings 11, so that the downhole liquid delivery pipes 5 can be close to the downhole oil pipe 6, and the large displacement during operation can be avoided, and the space occupied by the annulus 8 can be reduced.
[0026] The downhole oil pump 1 is a long tube pump; through experiments, for the heavy oil operation in Akesu oil field, the average pump efficiency of the long tube pump is higher, which is 66.6%; the average pump efficiency of the hydraulic feedback pump is 60.2%, and the average pump efficiency of the screw pump is 54.33%.
[0027] In order to conveniently adjust to the most suitable mining parameters, the downhole oil pump 1 is provided with a temperature sensor, which is convenient for monitoring the oil temperature near the downhole oil pump 1, and the flow sensor 12 and the flow regulating valve 13 are arranged on each of the liquid supply branch pipes 9, which is convenient for adjusting the flow of each of the downhole liquid delivery pipes 5, and then controlling the dilution ratio and the oil delivery temperature.
[0028] Finally, it should be noted that: the above examples are only used to illustrate the technical scheme of the utility model and not to limit it; although the utility model has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that: the specific implementation of the utility model can still be modified or some technical features can be replaced; without departing from the spirit of the technical scheme of the utility model, they should be covered in the technical scheme range of the utility model claimed.
Claims
1. A heavy oil lifting device, characterized in that: The system includes a downhole pump, a storage tank, a heater, a delivery pump, and several downhole delivery pipes. The downhole pump is installed in the downhole tubing. The outlet of the storage tank is connected to the inlet of the heater, and the outlet of the heater is connected to the inlet of the delivery pump. Several downhole delivery pipes are evenly arranged around the outside of the downhole tubing. The top ends of several downhole delivery pipes extend out of the well and are connected to the outlet of the delivery pump through a supply branch pipe. The bottom ends of several downhole delivery pipes extend out of the bottom of the downhole tubing and have multiple injection holes evenly opened on the side facing the center of the tubing.
2. The heavy oil lifting device according to claim 1, characterized in that: There are four downhole fluid delivery pipes, and the cross-section of each downhole fluid delivery pipe is an arc shape that bends toward the center of the downhole tubing.
3. The heavy oil lifting device according to claim 2, characterized in that: The outer wall of the downhole tubing is provided with several limiting rings at intervals corresponding to each downhole fluid delivery pipe, and the downhole fluid delivery pipe passes through several of the limiting rings.
4. The heavy oil lifting device according to any one of claims 1-3, characterized in that: The downhole pump is a long-tube pump.
5. The heavy oil lifting device according to claim 4, characterized in that: The downhole pump is equipped with a temperature sensor, and each of the supply pipes is equipped with a flow sensor and a flow regulating valve.