A nuclear magnetic capacitor short-circuiting device

Abstract

The present application discloses a nuclear magnetic capacitor short-circuit device, which relates to the field of nuclear magnetic resonance imaging logging instruments. The device includes a plurality of capacitor modules and a cylindrical pressure-bearing shell for accommodating the plurality of capacitor modules. The plurality of capacitor modules are evenly placed inside the shell parallel to the central axis of the cylindrical pressure-bearing shell; each capacitor module is provided with a plurality of high-voltage tantalum capacitors, and the high-voltage tantalum capacitors are connected in parallel. By providing a plurality of high-voltage tantalum capacitors in each capacitor module of the device, the total capacitance value of each capacitor module is increased, and the number of capacitor modules is reduced on the basis of increasing the capacitance value, thereby shortening the length of the instrument, reducing the weight of the instrument, and improving the success rate of logging.

Description

Technical Field

[0001] The present application relates to the field of nuclear magnetic resonance imaging logging instruments, and in particular to a nuclear magnetic resonance capacitor short-circuiting device. Background Art

[0002] Nuclear magnetic resonance imaging logging instrument is a high-end logging instrument used in the field of oil exploration and logging. It can effectively measure important petroleum physical parameters such as total porosity, effective porosity, free fluid porosity, capillary bound water porosity and related formation permeability of reservoirs, quantitatively analyze the oil, gas and water content in the formation and the existence status information in the formation. It is an indispensable survey instrument for today's oil exploration. The nuclear magnetic resonance logging instrument mainly consists of nuclear magnetic electronic circuit part, nuclear magnetic capacitor short-circuit part and nuclear magnetic probe part. The main function of the nuclear magnetic capacitor short-circuit part is to overcome the energy loss caused by cable logging, and continuously provide voltage to the instrument when transmitting downhole to complete the logging smoothly. The existing nuclear magnetic capacitor short-circuit device is a product design of more than 20 years ago. It is a design product of the previous generation of nuclear magnetic resonance logging instruments. With the improvement of electronic technology and the increase of functions of the new generation of nuclear magnetic instruments, as well as the change of mud, the design shows "a large number of electronic components, too long instrument length, too heavy instrument weight, high failure rate and high risk during construction" in its technology and practical application. Therefore, there is an urgent need for a nuclear magnetic capacitor short-circuiting device to solve the existing problems. Summary of the invention

[0003] The purpose of the present application is to provide a nuclear magnetic capacitor short-circuiting device to shorten the length of the instrument, reduce the weight of the instrument, and improve the success rate of well logging.

[0004] To achieve the above objectives, this application provides the following solutions:

[0005] The present application provides a nuclear magnetic capacitor short-circuit device, comprising: a first preset number of capacitor modules and a shell; the first preset number of capacitor modules are placed inside the shell parallel to the central axis of the shell; the positive electrodes of the first preset number of capacitor modules are all connected to the positive electrode of a high-voltage power supply; the negative electrodes of the first preset number of capacitor modules are all connected to the negative electrode of the high-voltage power supply;

[0006] The capacitor module includes a second preset number of high-voltage tantalum capacitors; the second preset number of high-voltage tantalum capacitors are connected in parallel; the positive electrode of the high-voltage tantalum capacitor is connected to the positive electrode of the high-voltage power supply; the negative electrode of the high-voltage tantalum capacitor is connected to the negative electrode of the high-voltage power supply.

[0007] Optionally, the shell is a cylindrical pressure-bearing shell.

[0008] Optionally, the shell is made of TC11 titanium alloy.

[0009] Optionally, the capacitance of the high-voltage tantalum capacitor is 750uF.

[0010] Optionally, the second preset number is 120, and the total capacitance value of each capacitor module is 900uF.

[0011] Optionally, the first preset number is four, and the total capacitance value of the four capacitor modules is 3.6 mF.

[0012] According to the specific embodiments provided in this application, this application discloses the following technical effects:

[0013] The present application provides a nuclear magnetic capacitor short-circuit device, which includes a plurality of capacitor modules and a housing for accommodating the plurality of capacitor modules. The plurality of capacitor modules are evenly placed inside the housing parallel to the central axis of the housing; each capacitor module is provided with a plurality of high-voltage tantalum capacitors, and the high-voltage tantalum capacitors are connected in parallel. By providing a plurality of high-voltage tantalum capacitors in each capacitor module of the device, the total capacitance value of each capacitor module is increased, and the number of capacitor modules is reduced on the basis of increasing the capacitance value, thereby shortening the length of the instrument, reducing the weight of the instrument, and improving the success rate of logging. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 A schematic structural diagram of a nuclear magnetic capacitor short-circuiting device provided in one embodiment of the present application;

[0016] Figure 2 This is the connection schematic diagram of four capacitor modules;

[0017] Figure 3 It is a cross-sectional view along the DD direction and the EE direction of the nuclear magnetic capacitor short-circuit device structure;

[0018] Figure 4 This is the schematic diagram of the capacitor module. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0020] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0021] In an exemplary embodiment, Figure 1-Figure 3 As shown, a nuclear magnetic capacitor short-circuit device is provided, comprising: a first preset number of capacitor modules and a shell; the first preset number of capacitor modules are placed inside the shell parallel to the central axis of the shell; the positive electrodes of the first preset number of capacitor modules are connected to the positive electrode of the high-voltage power supply; the negative electrodes of the first preset number of capacitor modules are connected to the negative electrode of the high-voltage power supply. The shell is a cylindrical pressure-bearing shell. The material of the shell is TC11 titanium alloy.

[0022] In this embodiment, the first preset number is four, and the second preset number is 120.

[0023] The device comprises four capacitor modules and a cylindrical shell of TC11 titanium alloy for accommodating the four capacitor modules; the four capacitor modules are evenly placed inside the cylindrical shell parallel to the central axis of the cylindrical shell; each capacitor module is provided with 120 high-voltage tantalum capacitors, and the high-voltage tantalum capacitors are connected in parallel.

[0024] Specifically, the embodiment of the present application provides a TC11 titanium alloy cylindrical shell, and the shell material is changed from the original 17-4PH stainless steel to TC11 titanium alloy. TC11 titanium alloy is a martensitic α+β type titanium alloy, which has excellent thermal strength below 500°C, and has high room temperature strength, corrosion resistance and creep resistance, thereby providing better protection for internal components.

[0025] Specifically, in this embodiment, the number of capacitor modules is 4, and the number of capacitor modules is reduced from 12 to 4, which greatly shortens the length of the instrument from 4.65 meters to 1.95 meters; at the same time, it also greatly reduces the weight of the instrument from 122Kg to 38Kg.

[0026] In this embodiment, four capacitor modules are connected in parallel, with their positive electrodes connected to the positive electrode of high voltage electricity (high voltage power supply), and the negative electrodes of the capacitor modules connected to the negative electrode of high voltage electricity. The positive electrodes of the 120 high-voltage tantalum capacitors in the capacitor module are all connected to the positive electrode of the high voltage electricity; the negative electrodes of the 120 high-voltage tantalum capacitors are all connected to the negative electrode of the high voltage electricity.

[0027] In this embodiment, the high-voltage tantalum capacitor has a capacitance of 750uF and a withstand voltage of 1000V, replacing the previous capacitor with a capacitance of 220uF.

[0028] Specifically, the total capacitance value of each capacitor module is 900uF, and the total capacitance value of the entire device is: 900uF×4=3.6mF.

[0029] The short circuit diagram of the capacitor module is as follows: Figure 4 As shown, each capacitor module includes three layers of parallel capacitors.

[0030] The first layer includes three rows of parallel capacitors, with 10 high-voltage tantalum capacitors in series in each row.

[0031] Calculation of the first layer capacitance: 750uF / 10×3=225uF.

[0032] The second layer includes 4 rows of parallel capacitors, with 10 high-voltage tantalum capacitors in series in each row.

[0033] Second layer capacitance calculation: 750uF / 10×4=300uF.

[0034] The third layer includes 5 rows of parallel capacitors, with 10 high-voltage tantalum capacitors in series in each row.

[0035] Calculation of the first layer capacitance: 750uF / 10×5=375uF.

[0036] The capacitance value of each capacitor module is calculated as: 225uF+300uF+375uF=900uF.

[0037] Calculation of capacitance value of 4 capacitor modules in parallel: 4×900uF=3600uF=3.6mF.

[0038] Specifically, when nuclear magnetic resonance instruments are measuring horizontal wells or brine mud, the mud load is large and the current is large, which requires capacitors with high storage energy. Replacing small-capacitance tantalum capacitors with large-capacitance high-voltage tantalum capacitors greatly increases the capacitance of the nuclear magnetic capacitor short-circuit device, which can largely meet the capacitance value required for the instrument to work. On the basis of increasing the storage energy of the capacitor short-circuit device, the number of capacitors is reduced, thereby increasing the richness of the instrument's usage scenarios.

[0039] The nuclear magnetic capacitor short-circuit device of the present application includes four capacitor modules and a cylindrical pressure-bearing shell of TC11 titanium alloy for accommodating the capacitor modules. The four capacitor modules are evenly placed inside the cylindrical pressure-bearing shell parallel to the central axis of the cylindrical shell; each capacitor module is provided with 120 high-voltage tantalum capacitors, and the high-voltage tantalum capacitors are connected in parallel. The device protects the internal capacitor elements by providing the TC11 titanium alloy cylindrical pressure-bearing shell; each capacitor module improves the total capacitance value of each capacitor module by providing 120 high-voltage tantalum capacitors, and reduces the number of capacitor modules on the basis of increasing the capacitance value, shortens the instrument length, reduces the instrument weight, and improves the success rate of logging.

[0040] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0041] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. At the same time, for those skilled in the art, according to the ideas of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A nuclear magnetic capacitor short-circuiting device, characterized in that: include: A first preset number of capacitor modules and a housing; A first preset number of capacitor modules are placed inside the housing parallel to the central axis of the housing; the positive electrodes of the first preset number of capacitor modules are connected to the positive electrode of the high-voltage power supply; the negative electrodes of the first preset number of capacitor modules are connected to the negative electrode of the high-voltage power supply; The capacitor module includes a second preset number of high-voltage tantalum capacitors; the second preset number of high-voltage tantalum capacitors are connected in parallel; the positive electrode of the high-voltage tantalum capacitor is connected to the positive electrode of the high-voltage power supply; the negative electrode of the high-voltage tantalum capacitor is connected to the negative electrode of the high-voltage power supply.

2. The nuclear magnetic capacitor short-circuiting device according to claim 1, characterized in that: The shell is a cylindrical pressure-bearing shell.

3. The nuclear magnetic capacitor short-circuiting device according to claim 1, characterized in that: The material of the shell is TC11 titanium alloy.

4. The nuclear magnetic capacitor short-circuiting device according to claim 1, characterized in that: The capacitance of the high voltage tantalum capacitor is 750uF.

5. The nuclear magnetic capacitor short-circuiting device according to claim 4, characterized in that: The second preset number is 120, and the total capacitance value of each capacitor module is 900uF.

6. The nuclear magnetic capacitor short-circuiting device according to claim 1, characterized in that: The first preset number is four, and the total capacitance value of the four capacitor modules is 3.6 mF.

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