Thermal cycle wax removal device for cavity between oil well casing pipe and oil well oil pipe

Abstract

A thermal cycle underground wax removal device for a cavity between an oil well casing pipe and an oil well oil pipe is composed of an underground wax removal part and an external heat source channel. The device is characterized in that the underground wax removal part is formed by arranging a heat circulation inlet and outlet pipeline in a cavity and a gap between an oil well casing and an oil pipe; the external heat source channel part is a sealed closed loop formed by connecting a circulating heat pipe inlet and outlet connector, a water returning and supplementing three-way connector and the internal and external source heat circulating part. The device is left in a well throughout the year, repeated operation is not needed, a large amount of manpower and material resources are saved, oil extraction operation does not need to be stopped during automatic wax removal, the oil extraction yield is not affected, energy generated by external hot water comes from solar energy, an air energy heat pump, an electromagnetic water heater and the like, long-term benefit is achieved through one-time investment, energy conservation and environmental protection are achieved, and the overall energy-saving and synergistic effect is remarkable.

Description

Technical Field

[0001] The utility model relates to a thermal circulation dewaxing device for the cavity between oil well casing and oil well tubing, in particular to a device which utilizes the cavity gap between the oil well casing and the oil well tubing to set a thermal circulation pipeline, an external heat source production device is connected, and the thermal energy is sent to the well for dewaxing operation through a sealed thermal energy circulation pipeline; the thermal circulation dewaxing device for the cavity between the oil well casing and the oil well tubing is mainly composed of the oil well casing, the oil well tubing, a thermal circulation sealed pipeline, an external heat source inlet and outlet interface, and a return water and water replenishment three-way joint. Background Art

[0002] At present, the widely used oil well dewaxing technologies mostly adopt electric heating, permanent magnetic dewaxing, heating of heating belt wellhead, electromagnetic heating, heating of pumping rod core cable, and traditional high-pressure steam dewaxing. Its dewaxing effect is not ideal. It not only requires a lot of equipment, vehicles and personnel, consumes a lot of manpower, material resources and electricity, but also has complicated process operations. It needs to be repeated every once in a while, and it is necessary to stop work and production during construction, resulting in serious waste of energy and financial resources and reduced production efficiency. Some dewaxing equipment is also very expensive, which greatly affects the unit oil production efficiency ratio. How to develop a dewaxing equipment with low cost, low use cost, no consumption of conventional energy, no need for repeated shutdowns, can achieve efficient removal of wax, improve oil production efficiency, reduce oil production energy consumption ratio, and better serve oil production; this is the goal of the majority of oilfield oil production scientific and technological workers, and it is also the expectation of the majority of oil production workers. Based on this, after years of research, design and planning, we put forward this scheme, that is, the design of the cavity thermal cycle dewaxing device between the oil well casing and the oil well oil pipe. Summary of the invention

[0003] The utility model provides a thermal cycle wax removal device for the cavity between the casing and the oil pipe of an oil well, which is composed of the cavity between the casing and the oil pipe of the oil well and the thermal cycle sealing pipeline to form an underground wax removal part; the external heat source inlet and outlet interface is connected with the return water replenishment three-way joint to form an external heat source channel part; the two major parts constitute the thermal cycle wax removal device for the cavity between the casing and the oil pipe of the oil well. It overcomes the shortcomings of the existing oil well underground wax removal technology equipment with high cost, complex operation process, single external heat source, each operation requires a lot of manpower, material and financial resources, and the need to stop the oil production operation to cause a decrease in oil production. The equipment is left underground all year round, does not need to be repeatedly operated to save a lot of manpower and material resources, and automatic wax removal does not need to stop the oil production operation, does not affect the oil production output, the energy generated by the external hot water comes from solar energy, air energy heat pump, electromagnetic water heater, etc., one-time investment and long-term benefits, energy saving and environmental protection, the circulating power pump only consumes a small amount of electricity when starting, and no energy consumption at other times, and the overall energy saving and efficiency improvement effect is significant.

[0004] The purpose of the utility model is achieved in this way: a thermal circulation dewaxing device for the cavity between oil well casing and oil well tubing, which is composed of a downhole dewaxing part consisting of a cavity between oil well casing and oil well tubing and a thermal circulation sealing pipeline; an external heat source inlet and outlet interface is connected with a return water and water replenishment three-way joint to form an external heat source channel part; the two major parts constitute the thermal circulation dewaxing device for the cavity between oil well casing and oil well tubing.

[0005] The purpose of the utility model can also be achieved through the following measures: the cavity between the oil well casing and the oil well tubing and the heat circulation channel constitute the downhole wax removal part; the effective space cavity is formed in the middle by the inner and outer overlap of the oil well casing and the oil well tubing, the heat circulation pipeline is symmetrically arranged in the cavity, and the bottom U-shaped loop connects the inlet and outlet heat pipes to form a sealed loop; the external heat source inlet and outlet interface is connected with the return water replenishment three-way joint to form an external heat source channel part; the inlet and outlet downhole heat circulation pipe interface is sealedly connected with the inlet and outlet return water replenishment pipeline and the three-way joint, and then sealedly connected with the external heat source body. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 It is a diagram showing the overall structure of a thermal cycle wax removal device for the cavity between oil well casing and oil well tubing; DETAILED DESCRIPTION

[0007] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0008] The present oil well casing and oil well tubing cavity thermal circulation dewaxing device comprises an oil well casing 1, an oil well tubing 2, an oil well casing and tubing cavity 3, a thermal circulation sealed pipe (inlet) 4, a thermal circulation sealed pipe (outlet) 5, and a bottom U-shaped loop 8 to form a thermal circulation downhole dewaxing part; a thermal circulation inlet 6, a thermal circulation outlet 7, and a return water replenishment tee joint 9 to form a thermal circulation sealed transmission channel connection part; the two parts are combined to form the oil well casing and tubing cavity thermal circulation dewaxing device.

[0009] The entire oil well casing and oil well tubing cavity thermal circulation dewaxing device, the oil well casing and oil well tubing cavity thermal circulation dewaxing device, which is composed of the oil well casing and oil well tubing cavity, the oil well tubing and the oil well tubing cavity, the downhole dewaxing part; the external heat source inlet and outlet interface is connected with the return water and water replenishment three-way joint to form the external heat source channel part; the two major parts are sealed and connected with the external heat source.

[0010] Compared with the prior art, the utility model has the following advantages:

[0011] 1. The utility model utilizes an external heat source, through a heat cycle sealed connecting pipe, to connect with a sealed heat cycle pipe arranged in the cavity between the oil well casing and the oil pipe, and utilizes external heat energy to remove wax underground; it is used to remove the oil recovery impact caused by wax deposition in the oil well, increase the oil recovery efficiency of the oil well, reduce or eliminate the traditional oil well wax removal process, and improve the energy-saving effect of oil recovery. Compared with the traditional oil well wax removal technology, it has the advantages of good wax removal effect, low cost, simple construction, long-term use after one-time investment, high cost performance, good sealing and heat preservation, flexible use and installation, effective use of various renewable energy resources, reduction of traditional energy, manpower, financial resources and electricity consumption, and improved oil recovery efficiency.

[0012] 2. The utility model has reasonable design, simple structure, can form serialized products, strong practicality, good wax removal effect, significant energy-saving effect, and low cost.

[0013] 3. The utility model technology can be made into different specifications and sizes, suitable for heating and wax removal in various oil wells, and has a wide range of application fields and practical value.

Claims

1. A thermal cycle wax removal device for the cavity between oil well casing and oil well oil pipe, which consists of a downhole wax removal part and an external heat source channel; its characteristics are: The downhole wax removal part consists of a cavity between the oil well casing and the oil pipe, with a heat circulation inlet and outlet pipe set in the gap; the external heat source channel part is connected by the circulating heat pipe inlet and outlet interface, the return water and water replenishment three-way joint and the internal and external source heat circulation parts to form a sealed closed loop.

2. The thermal cycle wax removal device for the cavity between oil well casing and oil well oil pipe according to claim 1 is characterized by: The downhole wax removal part is composed of an effective space cavity formed by the inner and outer overlapping of the oil well casing and the oil pipe. The heat circulation sealed pipeline is symmetrically arranged in the cavity, and the bottom U-shaped loop connects the inlet and outlet heat pipes to form a sealed loop.

3. The thermal cycle wax removal device for the cavity between oil well casing and oil well oil pipe according to claim 1 is characterized by: The external heat source channel part is composed of a heat circulation pipe, a heat pipe inlet and outlet interface, and a return water and water supply three-way joint, which are connected to each other and then sealed to the external heat source body.

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