CN214384734U

CN214384734U - Three-electrode controllable self-extinguishing arc discharge switch device structure for underground operation

Info

Publication number: CN214384734U
Application number: CN202120647032.6U
Authority: CN
Inventors: 于营波; 康忠健; 王聪; 聂云良; 邵在康; 高崇
Original assignee: China University of Petroleum East China
Current assignee: China University of Petroleum East China
Priority date: 2021-03-30
Filing date: 2021-03-30
Publication date: 2021-10-12
Anticipated expiration: 2031-03-30

Abstract

A three-electrode controllable self-extinguishing arc discharge switching device structure for downhole operations, comprising: the device comprises a fixed electrode part, an adjustable electrode part, a trigger electrode part, an insulating layer and a self-arc-quenching structure; the fixed electrode part comprises an upper wiring terminal, a fixed electrode and a set screw. The adjustable electrode part comprises a lower wiring terminal, an adjustable electrode, a fixing nut, a set screw and a set nut. The trigger electrode part comprises a trigger electrode wiring terminal, a trigger electrode, a connecting rod and a set screw and can trigger the conduction of the discharge switch. The insulating layer includes upper end insulating layer, middle part insulating layer and lower extreme insulating layer. Through the structure, the device can ensure good sealing property and insulating property underground. The self-extinguishing structure comprises a clamping groove, a U-shaped iron core and an external electric field, and the electric arc can be quickly extinguished under the action of the Lorentz force of the external electric field. The pulse discharge switch electrode material adopts carbon-tungsten alloy, and has strong anti-corrosion capability. The discharge switch electrode gap is adjustable by utilizing the fixing nut and the fastening nut, and the service life of the switch electrode is prolonged while the discharge voltage grade is adjustable.

Description

Three-electrode controllable self-extinguishing arc discharge switch device structure for underground operation

Technical Field

The utility model belongs to unconventional shale oil gas and pulse power field, specificly relate to a three-electrode controllable self-extinguishing arc discharge switch device structure of borehole operation.

Background

Shale oil and gas in China have the problems of complex geological conditions, deep burial depth, old stratum generation, deficient water resources and a lot of problems in shale oil and gas development. However, shale oil and gas resources in China are quite rich, the shale gas reserves reach 36.1 billion cubic meters, the first place in the world, the shale oil can be exploited by 50 billion tons, and the third place in the world is just behind Russia and the United states. Under the vigorous promotion of relevant departments and governments, with the progress of technology, the development prospect of the shale oil gas in China is very wide.

In unconventional oil and gas development, a pulse power technology is utilized, high-pressure pulses with the same frequency as the natural frequency of a target reservoir are continuously applied to the target reservoir, and the target reservoir can enter a resonance state, so that the porosity of the reservoir is greatly improved, the development of reservoir fractures is promoted, the permeability is improved, and the aims of stable production and yield increase of shale oil and gas are fulfilled.

The shale oil and gas wells at home and abroad are usually provided with the discharge switches with nonadjustable electrodes when pulse power operation is carried out, the gaps of the discharge switches used in the method are fixed, the discharge voltage grade is nonadjustable, and proper discharge voltage cannot be selected according to different stratum characteristics. If the discharge voltage is changed, the discharge switch needs to be replaced, and the operation is complex. The utility model discloses discharge switch can adjust the discharge voltage level, can effectively act on at the target reservoir, arouses reservoir resonance, reduces unnecessary energy loss.

In unconventional oil and gas development, a high-frequency high-voltage strong pulse is required to be used for continuously acting on a target reservoir for a long time, and the requirement on an electrode in a discharge switch is extremely high. The electrode material adopted by the discharge switch of the utility model is carbon-tungsten alloy, which has high hardness and strong anti-electric corrosion capability. The discharge switch electrode adopts an adjustable structure, so that the electrode loss is reduced to the maximum extent, and the service life of the electrode is prolonged. The trigger electrode adopts adjustable structure, reduces energy loss.

In the underground construction operation, the equipment is required to have extremely high insulating and sealing performance. The utility model discloses pulse discharge switch adopts polytetrafluoroethylene material's three-layer insulation system, discharges for preventing discharge switch electrode and outer wall, has adopted polytetrafluoroethylene material's holding screw, strengthens insulating, and the resistance to compression leakproofness is high, is applicable to various unconventional oil gas well depths.

The utility model relates to a controllable self-extinguishing arc discharge switch device structure of three electrodes of borehole operation can make the device guarantee good leakproofness and insulating nature under the high pressure condition in the pit. The pulse discharge switch electrode is made of high-electric-corrosion-resistance carbon-tungsten alloy materials, and the gap of the switch electrode is adjustable by utilizing the fastening nut, so that the normal work of equipment is ensured, the energy loss is reduced to the maximum extent, and the service life of the discharge switch is prolonged.

SUMMERY OF THE UTILITY MODEL

The technical solution problem of the utility model is that: the defects of the prior art are overcome, and the three-electrode controllable self-extinguishing arc discharge switch device structure for underground operation is provided. The discharge voltage level of the high-voltage discharge switch is adjustable, electric arcs can be automatically extinguished, the insulation sealing performance is good, the high-voltage discharge switch can continuously work under the conditions of high dimensional voltage and high frequency, the energy loss is reduced to the maximum extent, and the service life of the discharge switch is prolonged.

The above object of the present disclosure is achieved by the following technical solutions:

a three-electrode controllable self-extinguishing arc discharge switching device structure for downhole operations, comprising: the self-extinguishing arc electrode comprises a fixed electrode part, an adjustable electrode part, a trigger electrode part, an insulating layer and a self-extinguishing arc structure; wherein the content of the first and second substances,

the fixed electrode part comprises a fixed electrode, an upper terminal and a set screw,

the upper terminal is fixedly connected with the fixed electrode,

the fixed electrode is fixed through a set screw;

the adjustable electrode part comprises a lower wiring terminal, an adjustable electrode, a fixed nut, a set screw and a set nut,

the height of the adjustable electrode is adjusted through the screw thread and is fixed through the fastening nut,

the lower terminal is fixedly connected with the adjustable electrode,

the fixing nut is fixed by an inner hexagonal set screw,

the adjustable electrode is connected with the fixed nut through threads;

the trigger electrode part comprises a trigger electrode wiring terminal, a trigger electrode, a connecting rod and a set screw,

the trigger electrode terminal is connected with the connecting rod,

the connecting rod is connected with the trigger electrode and is fixed through a set screw;

the insulating layer part comprises an upper end insulating layer, a middle insulating layer and a lower end insulating layer;

the self-extinguishing structure comprises a U-shaped iron core, a clamping groove and an external electric field,

the U-shaped iron core is fixed between the fixed electrode and the adjustable electrode through the clamping groove,

the U-shaped iron core is wound with a lead, and an external electric field is formed after the lead is electrified;

preferably, the adjustable electrode, the fixed electrode and the trigger electrode are made of carbon-tungsten alloy.

Preferably, the gap between the adjustable electrode and the fixed electrode is 0.5-1 mm.

Preferably, the insulating layer is made of polytetrafluoroethylene.

Preferably, the external fastening screw of the fixed electrode is made of polytetrafluoroethylene materials.

Preferably, the internal set screw of the fixed electrode and the adjustable electrode set screw are made of stainless steel materials.

Preferably, the U-shaped iron core in the self-arc-quenching structure is made of soft iron materials.

Compared with the prior art, the beneficial effect that this disclosure brought does:

the utility model discloses a three-electrode trigger mechanism has that operating voltage is high, triggers advantages such as controllable. The self-extinguishing structure is added in the adopted switch structure, the time for the switch to rebound and close is shortened, the switch jitter is reduced, and the conduction delay is reduced. The discharge switch electrode material is carbon-tungsten alloy, and has high hardness and strong anti-corrosion capability. The switch electrode adopts an adjustable structure, the discharge voltage level is adjustable, the electrode loss is reduced, and the service life of the electrode is prolonged. The insulating layer adopts three-layer construction, adopts polytetrafluoroethylene holding screw to fix, and withstand voltage grade is high, and insulating properties is good.

The utility model provides a controllable self-extinguishing arc discharge switch device structure of three electrodes of borehole operation can effectively overcome traditional discharge switch's not enough, continuous work under high frequency, continuous, stable high strength pulse effect, selects different voltage levels to induce reservoir resonance to different target reservoir, reduces unnecessary energy loss, can promote reservoir porosity by a wide margin, promotes reservoir crack development, improves the permeability, reaches the purpose that shale oil gas is surely produced, increases production.

Drawings

Fig. 1 is a structural diagram of a three-electrode controllable self-extinguishing arc discharge switch device for downhole operation according to the present invention.

The reference numerals are explained below:

1-1, an upper terminal; 1-2, fixing an electrode; 1-3, tightening a screw; 2-1, a lower terminal; 2-2, adjustable electrodes; 2-3, fixing a nut; 2-4, tightening a screw; 2-5, tightening the nut; 3-1, a trigger electrode terminal; 3-2, triggering an electrode; 3-3, connecting rod; 3-4, tightening the screw; 4-1, an upper end insulating layer; 4-2, a middle insulating layer; 4-3, a lower end insulating layer; 5-1, a clamping groove; 5-2, a U-shaped iron core; 5-3, applying an electric field;

fig. 2 is a diagram of a trigger electrode control circuit according to the present invention.

Fig. 3 is a diagram of a self-extinguishing circuit structure according to the present invention.

Detailed Description

As shown in fig. 1, the utility model provides a controllable self-extinguishing arc discharge switching device structure of three electrodes of borehole operation, include: the device comprises a fixed electrode part, an adjustable electrode part, a trigger electrode part, an insulating layer and a self-arc-quenching structure; wherein the content of the first and second substances,

the fixed electrode part comprises an upper wiring terminal 1-1, a fixed electrode 1-2 and a set screw 1-3;

the upper terminal 1-1 is fixedly connected with the fixed electrode 1-2,

the fixed electrode 1-2 is fixed through a set screw 1-3;

the adjustable electrode part comprises a lower wiring terminal 2-1, an adjustable electrode 2-2, a fixing nut 2-3, a set screw 2-4 and a set nut 2-5;

the lower terminal 2-1 is fixedly connected with the adjustable electrode 2-2,

the height of the adjustable electrode 2-2 is adjusted through threads, and the adjustable electrode is fixed with the fastening nut 2-5 through the fixing nut 2-3 and the fastening screw 2-4;

the trigger electrode part comprises a trigger electrode terminal 3-1, a trigger electrode 3-2, a connecting rod 3-3 and a set screw 3-4;

the trigger electrode terminal 3-1 is connected with the connecting rod 3-3,

the connecting rod 3-3 is connected with the trigger electrode 3-2 and fixed through a set screw 3-4;

the insulating layer part comprises an upper end insulating layer 4-1, a middle insulating layer 4-2 and a lower end insulating layer 4-;

the self-arc-quenching structure comprises a clamping groove 5-1, a U-shaped iron core 5-2 and an external electric field 5-3,

the U-shaped iron core 5-2 is fixed between the fixed electrode 1-2 and the adjustable electrode 2-2 through the clamping groove 5-1,

the U-shaped iron core 5-2 is wound with a lead, and an external electric field 5-3 is formed after the lead is electrified;

Preferably, the insulating layer is made of polytetrafluoroethylene.

As shown in FIG. 2, the utility model provides a trigger electrode control circuit of a three-electrode controllable self-extinguishing arc discharge switch device structure for downhole operation,

in the trigger electrode control circuit, a power supply charges a voltage doubling circuit, a trigger signal passes through the trigger circuit, and an isolating switch tube is opened to connect the high voltage in the voltage doubling circuit with a trigger electrode so as to complete the trigger action.

As shown in FIG. 3, the utility model provides a self-extinguishing control circuit of a three-electrode controllable self-extinguishing arc discharge switch device structure for downhole operation,

in the self-arc-quenching control circuit, a power supply supplies power to an energy storage element, a control signal passes through the control circuit and then is switched on, and current in the energy storage element instantly flows into a coil to form an external electric field 5-3;

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any form, and any simple modification, equivalent change and modification made by the technical spirit of the present invention to the above embodiments do not depart from the technical solution of the present invention.

Claims

1. A three-electrode controllable self-extinguishing arc discharge switch device structure for downhole operation is characterized by comprising the following structures: the device comprises a fixed electrode part, an adjustable electrode part, a trigger electrode part, an insulating layer and a self-arc-quenching structure; the fixed electrode part comprises an upper wiring terminal, a fixed electrode and an inner hexagonal set screw; the adjustable electrode part comprises a lower wiring terminal, an adjustable electrode, a fixing nut, a fastening screw and a fastening nut; the trigger electrode part comprises a trigger electrode wiring terminal, a trigger electrode, a connecting rod and a set screw; the insulating layer comprises an upper end insulating layer, a middle insulating layer and a lower end insulating layer; the self-arc-quenching structure part comprises a clamping groove, a U-shaped iron core and an external electric field.

2. The structure of claim 1, wherein the fixed electrode, the adjustable electrode, and the trigger electrode are made of high hardness and high corrosion resistance carbon-tungsten alloy.

3. The structure of a three-electrode controllable self-extinguishing arc discharge switch device for downhole operation as claimed in claim 1, wherein the adjustable electrode can be adjusted in gap distance from the trigger electrode by using a fastening nut.

4. The structure of claim 1, wherein the trigger electrode is controllable, and the gap distance between the trigger electrode and the fixed electrode and between the trigger electrode and the adjustable electrode can be adjusted by using a square connecting rod and upper and lower fastening screws, or can be adjusted by using a trigger control circuit.

5. A three-pole controllable self-extinguishing arc discharge switch device structure for downhole operation according to claim 1, characterized in that the arc extinguishing capability of the self-extinguishing arc structure can be adjusted by the arc extinguishing control circuit.