RU2239051C2 - Method for supplying energy to well equipment for bed state control during oil extraction and device for realization of said method - Google Patents

Abstract

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes feeding electric energy from chemical power elements. Consecutive activation of chemical elements is performed by supplying bed fluids into chemical power elements and main component impregnation. Power accumulation of energy generated by chemical elements may be performed. Switching of chemical elements may be performed either in time or based on voltage fall. Device is mounted in the well and contains chemical power elements mounted in bodies having hollows, and in common body fixed with space inside the well. Hollows in chemical power elements bodies are filled by main component and made with possible interconnection through one or several inlet apertures in bodies and in common body with ring-shaped space between common body and well for impregnation of main component of chemical power elements by bed fluids. Inside common body serially connected power accumulator, voltage control block and control block may be mounted. Inlet apertures in bodies of different chemical elements may have different diameter. Inlet apertures may be closed by valves with drives. Device may have capability for consecutive activation of chemical elements by giving commands to valves drives from control device and/or timer. In inlet apertures filters may also be mounted.

EFFECT: higher operation resource, lesser weight and dimensions of power sources.

2 cl, 6 dwg

Description

The invention relates to oil and gas production technology.

There is a method of power supply of downhole equipment and a power source for downhole equipment in the form of a turbogenerator containing a hydraulic turbine driven by a mud flow, an oil-filled stator filled with an epoxy compound, and a rotor of an alternating current generator with permanent magnets located on the shaft of the hydraulic turbine (A. Molchanova A. , A. Siraev. Autonomous borehole systems with magnetic recording. - M .: Nedra, 1979, p. 102 ... 103).

The disadvantage of this power source is its low resource associated with wear of bearings and seals. This method and device are used when drilling wells, when frequent prevention of equipment raised to the surface is possible. Under the conditions of well operation, the equipment should work in the well for several years without prevention, preferably throughout the life of the well. The method and device described above do not provide this.

Also known is the power source of the downhole equipment according to the certificate of the Russian Federation for utility model No. 18211 (prototype). This power source contains chemical elements, each of which is made in the casing and placed in a common casing, which is fixed with an annular gap inside the drill pipe string above the borehole equipment using a connector at the end and a cable lug.

The disadvantage is the low life of chemical elements and their inability to work conditions in the process of oil production. The battery life is very limited and they are not restored or recharged. Such elements can be used when drilling a well to power the electronic components of downhole equipment, but are generally not suitable for working in a well in oil production conditions.

The objective of the invention is to increase the life of the equipment for monitoring the state of the reservoir during oil production.

The solution to this problem was achieved due to the fact that the method of power supply to the downhole equipment for monitoring the state of the formation during oil production, including the supply of electrical energy from chemical power elements, is characterized in that the chemical elements of the power are sequentially activated by supplying or impregnating the main component of chemical sources using formation fluids . At the same time carry out the accumulation of energy produced by chemical elements. Switching of chemical elements is carried out by voltage drop or by time.

A device for energy supply of downhole equipment for monitoring the state of the formation during oil production, installed in the well, containing chemical elements installed in the casings and in a common housing fixed with an annular gap in the well, characterized in that the cavities in the chemical element casings are filled with the main component, and these the cavity is configured to communicate through the inlet openings in the housings and the common housing with an annular gap between the common housing and the well. An energy storage device, the input of which is connected to the outputs from the chemical elements, as well as a voltage control unit, the input of which is connected to the output of the energy storage device and a control unit, the input of which is connected to the output of the voltage control unit, can be installed inside the common housing. The inlets can be either open or closed valves with actuators. The device is configured to alternately activate the chemical elements by issuing commands to the valve actuators from the control unit or from the timer or from the control unit and timer at the same time. Filters can be installed in the inlets, for example, in front of or after the valves.

Patent studies have shown that the proposed technical solution has novelty, inventive step and industrial applicability, i.e., all the criteria of the invention. Novelty is confirmed by research. The inventive step is justified by the fact that the proposed technical solution is not obvious to a specialist of average skill, and if it were obvious, then such a method and devices would be implemented in practice or, at least, their description would appear in the specialized literature, since the task of creating The source, which has been working offline for a long time without maintenance, has been facing the oil industry for many years and has not yet been implemented in practice or even theoretically. The proposed invention will increase the resource source of electricity by an order of magnitude.

The technical implementation of the invention is real, because commercially available parts and components and electronic components of switching systems, measuring voltage and time are used in the design of the device (source of energy supply for the downhole equipment).

The invention is illustrated in figure 1 ... 7, where:

figure 1 is a diagram of the implementation of the method and the placement of the power supply device of the downhole equipment as part of the drill pipe string;

figure 2 - diagram of the device without valves;

figure 3 is a layout diagram of a device with valves and a control unit;

figure 4 is a diagram of a device with valves, a control unit and a timer;

figure 5 is a chemical element without valve;

figure 6 is a chemical element with a valve and actuator.

The power supply device of the downhole equipment 1 (Fig. 1) is docked to the downhole equipment 2 and installed in the well 3, which is brought into the oil reservoir 4. For example, the power supply device of the downhole equipment can be installed at the end of the tubing 4, which, in turn, installed in the casing 6. In the upper part of the tubing mounted fountain equipment 7 and the oil pipeline 8.

The power supply device of the downhole equipment (figure 2) contains chemical elements 9 and 10, made in the casing 11 and installed in a common casing 12, fixed with an annular gap “A” inside the well 3. Several chemical elements 9 and 10 can be performed. Chemical elements 9 and 10 are installed above the downhole equipment 2 and connected to it using a cable lug 13 with sealing of all wires and connector 14. All chemical elements 9 and 10 contain the main component 15 inside the housings 11. The main component 15 is mainly in the solid phase, although the possibility of using pastes and suspensions is not excluded. In the housings 11 and 12, one or more inlets “B” are made. In this case, the inlet openings “B” on different elements have different diameters, which is necessary for the alternate activation of chemical elements. In the common housing 12, an energy storage device 16 can be installed, the input of which is connected to the outputs from chemical sources 9 and 10. Energy storage device 16 can be made on capacitors or ionistors.

Figure 3 shows a diagram in which the input of the voltage control unit 17 is connected to the output of the energy storage device 16. The output from the voltage control unit 17 is connected to the input to the control unit 18. The outputs from the control unit 18 are connected to the switch 19 and to the downhole monitoring equipment formation status 2. All electronics and wires are inside the common housing 12 and are completely sealed. Chemical elements 9 and 10 are equipped with valves 20, each of which is equipped with an actuator 21. These valves are designed to control the flow of formation fluids into the bodies of chemical elements 9 and 10.

Figure 4 shows a similar diagram, but an additional timer 22 is installed, the output of which is connected to the input to the control unit 18. The next chemical element is connected in time.

Figure 5 shows the design of a chemical element without valves. All chemical elements have two electrodes. One electrode 23 is brought out through the insulating sleeve 24, and the housing 11, for example, serves as the second electrode. A filter 25 can be installed in the hole “B”.

6 is a design of a chemical element equipped with valves for controlling the supply of formation fluids for impregnation of the main component 15 and its activation by formation fluids.

In one embodiment of FIGS. 2 and 6, the holes “B” are not closed and have different diameters.

In other embodiments, FIGS. 3, 4, 5 and 6 show chemical elements 9 and 10 with inlets “B” closed by valves 20 with actuators 21.

The device in the first embodiment (figure 2 and 5) works as follows. In the process of oil or gas production, formation fluids (oil, gas, a mixture of oil with gas, water, etc.) penetrate into the chemical elements 9 and 10 through inlet ports “B” and impregnate the main component 15, for example, the NaCl salt, which is, for example, in the form of a compressed powder. As a result, the first chemical element 9 is first activated, having larger “B” holes, then the next chemical element 10, because the “B” inlets in it have a smaller diameter and the process of filling the cavity of the chemical element with 10 fluids and impregnating the main component with them 15 is much slower. The number of chemical elements may be more than two. Between the electrode 23 and the housing 11, a voltage arises which is supplied through the energy storage 16 and further to the downhole tool 2. The downhole tool 2 measures the parameters of the formation, for example pressure, temperature, etc., and transmits these parameters to the surface via an electromagnetic communication channel. For the implementation of the electromagnetic communication channel, the downhole tool is mounted on centralizers and connected to two electrically conductive parts of the electric separator (a centralizer, an electric separator and an electromagnetic communication channel are not shown in FIGS.

The second modification of the power source of the downhole equipment (Fig.3 and 6) works as follows. The signal from the control unit 18 (FIG. 1) is supplied to the valve actuator 21, which moves the valve 20, opening the inlet opening “B”. From the annular gap “A” through the inlet “B” and the filter 25 into the cavity “C” reservoir fluids come. Formation fluids impregnate the main component 15. Between the electrode 23 and the housing 11 a voltage occurs. When the voltage of the chemical element 9, which controls the voltage control unit 17, decreases, the control unit 18 automatically activates the next chemical element 10 by supplying a signal to the actuator 21 of the valve 20 and at the same time carries out a switching with the help of the switch 19, i.e., it turns off the spent chemical element 9 from the downhole equipment 2 and connects the chemical element 10. It is possible to supply a control signal instead of the control unit 18 with the timer 22 (figure 3), in this case, the switching of the chemical elements 9 and 10 It is not done to reduce the voltage at the electrodes, but automatically in time. The application of the invention allowed:

1. For the first time to develop a relatively energy-intensive and cheap source for long-term power supply of downhole equipment in oil production.

2. To use reservoir fluids, which are always present during oil production, as an activating component of a chemical power source, and thereby reduce the weight and dimensions of chemical elements by eliminating the activating component and the device that implements the mixing of components from their design.

3. To increase the life of the power source by an order of magnitude and provide uninterrupted power supply to the borehole equipment with electricity.

4. To stabilize the supply voltage of the downhole equipment due to the alternate connection of chemical elements.

5. To obtain a significant economic effect due to the elimination of tripping operations for frequent replacement of a previously used power source for downhole equipment.

Claims (11)

1. The method of power supply to the downhole equipment for monitoring the state of the formation during oil production, comprising supplying electric energy from chemical power elements, characterized in that the chemical elements are sequentially activated by supplying formation fluids into the chemical power elements and impregnating the main component. 2. The method according to claim 1, characterized in that the accumulation of energy produced by chemical elements. 3. The method according to claim 1 or 2, characterized in that the switching of chemical elements is carried out by voltage drop or by time. 4. Device for power supply of downhole equipment for monitoring the state of the formation during oil production, installed in the well and containing chemical power elements installed in the bodies having cavities and in the common body, while the common body is fixed with a gap inside the well, characterized in that the cavity in the cases of chemical batteries, the batteries are filled with the main component and are configured to communicate through one or more inlets in the cases and in the common case with an annular gap between the common case and well for impregnation of the main component of chemical nutrients with reservoir fluids. 5. The device according to claim 4, characterized in that an energy storage device is installed inside the common housing. 6. The device according to claim 5, characterized in that a voltage control unit is installed inside the common housing, the input of which is connected to the output of the energy storage device. 7. The device according to claim 6, characterized in that a control unit is installed inside the common housing, the input of which is connected to the output of the voltage control unit. 8. The device according to claim 4, characterized in that the inlets on the housings of different chemical elements have different diameters. 9. The device according to claim 8, characterized in that the inlet openings are closed by valves with actuators. 10. The device according to claim 9, characterized in that it is made with the possibility of alternately activating chemical elements by issuing commands to the valve actuators from the control device and / or from the timer. 11. The device according to claim 9 or 10, characterized in that filters are installed in the inlets.

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