阅读说明：本技术 一种井下作业脉冲电极结构 (Downhole operation pulse electrode structure ) 是由 康忠健 聂云良 郑世超 王增宏 王聪 翟刚毅 龚大建 王玉芳 于 2019-10-18 设计创作，主要内容包括：一种油气井作业脉冲电极结构,包括：阴极通道、阳极通道、绝缘层、密封O型圈；所述阴极通道包括阴极接线端、外连接筒、引斜头、内六角丝堵、紧定螺钉和可调阴极电极。所述阳极通道包括阳极接线端、第一阳极柱、第二阳极柱和阳极电极。所述绝缘层包括上端绝缘层和下端绝缘层。密封O型圈包括外层密封和内层密封。通过上述结构,可以使装置在井下40MPa维压下保证良好密封性、绝缘性。脉冲电极采用高抗电腐蚀碳钨合金材料并利用紧定螺钉使得电极间隙可调,保证设备正常工作的同时,最大限度减小电极损耗,增加电极使用寿命。(A pulsed electrode structure for oil and gas well operations, comprising: the device comprises a cathode channel, an anode channel, an insulating layer and a sealing O-shaped ring; the cathode channel comprises a cathode wiring end, an outer connecting cylinder, an inclined guiding head, an inner hexagonal plug, a set screw and an adjustable cathode electrode. The anode channel comprises an anode wiring terminal, a first anode post, a second anode post and an anode electrode. The insulating layer includes an upper end insulating layer and a lower end insulating layer. The sealing O-ring comprises an outer seal and an inner seal. Through the structure, the device can ensure good sealing performance and insulating property under the underground pressure of 40 MPa. The pulse electrode is made of high-electric-corrosion-resistance carbon-tungsten alloy materials, and the gap between the electrodes is adjustable by utilizing the set screw, so that the normal work of equipment is ensured, the electrode loss is reduced to the maximum extent, and the service life of the electrode is prolonged.)

1. The utility model provides an oil gas well operation pulse electrode device structure which characterized in that includes following structure: the device comprises a cathode channel, an anode channel, an insulating layer and a sealing O-shaped ring; the cathode channel comprises a cathode wiring end, an outer connecting cylinder, an inclined guiding head, an inner hexagonal plug, a set screw and an adjustable cathode electrode. The anode channel comprises an anode wiring terminal, a first anode post, a second anode post and an anode electrode. The insulating layer includes an upper end insulating layer and a lower end insulating layer. The sealing O-ring comprises an outer seal and an inner seal.

2. The oil and gas well operation pulse electrode device structure of claim 1, wherein the anode electrode and the adjustable cathode electrode are made of high-hardness and high-corrosion-resistance carbon-tungsten alloy materials.

3. The oil and gas well operation pulse electrode device structure of claim 1, wherein the adjustable cathode electrode can be adjusted to an optimal gap distance by using a set screw according to the electrode corrosion degree, and the service life of the electrode is prolonged.

Technical Field

The invention belongs to the field of unconventional shale oil gas and pulse power, and particularly relates to a pulse electrode device structure for oil gas well operation.

Background

Shale oil and gas resources in China are rich, and the total geological storage capacity of the shale gas which is proved to be in the Szechwan basin and the peripheral marine strata is up to 7643 billion cubic meters. The Chongqing Fuling shale gas field cumulatively ascertains geological reserves 6008 billion cubic meters, and becomes the shale gas field with the maximum reserves outside North America. The geological environment of the shale oil gas in China is complex and changeable, so that the exploitation of the shale oil gas faces a plurality of problems and challenges, but the development of the shale oil gas in China has wide prospects under the favorable conditions of wide shale distribution, multiple strata, large shale gas resource amount and the like.

In unconventional shale oil and gas development, we found that: the high-energy shock wave with the natural frequency of the target reservoir stratum continuously acts on the reservoir stratum, and the resonance of the target reservoir stratum can be induced, so that the porosity of the reservoir stratum is greatly improved, the development of reservoir stratum 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 well operation at home and abroad often adopts an 'electric blasting wire' detonation mode to generate high-energy shock waves, the used electrode of the method is a single-service-life electrode, a mechanical structure is needed to continuously convey new electric blasting wires to underground construction equipment, and the wire feeding process needs several minutes, so that the pulse frequency is greatly different from the inherent frequency of a reservoir stratum, the inherent frequency of the reservoir stratum cannot be reached, and the resonance of the target reservoir stratum cannot be induced. The electrode of the invention generates pulse shock waves based on the liquid-electricity effect, the frequency can reach dozens of hertz, the pulse intensity is high, and the electrode can effectively act on a target reservoir stratum to cause reservoir stratum resonance.

The pulse power impact energy in the traditional medical treatment and sewage treatment system is low, and the electrode loss is small. In unconventional shale oil and gas development, a high-pressure high-frequency strong pulse continuous action target reservoir stratum is needed, and the impact of the center point of a pulse electrode gap is up to hundreds of megapascals. Under high-intensity and high-frequency impact, the electrode is seriously corroded. The electrode material adopted by the invention is carbon-tungsten alloy, and has high hardness and strong anti-corrosion capability. The cathode 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.

When the underground construction operation is carried out, the requirement on the insulating and sealing performance of the equipment is very high, and how to ensure the normal work of the equipment in the underground of thousands of meters is very important. The pulse electrode adopts the sealing O-shaped ring to carry out pressure-resistant sealing, the pressure-resistant sealing grade reaches 40MPa, and the pulse electrode is suitable for various unconventional shale oil-gas well depths.

The invention relates to a shale oil and gas well operation pulse electrode structure which can ensure that the device can ensure good tightness and insulation under the underground 40MPa dimensional pressure. The pulse electrode is made of high-electric-corrosion-resistance carbon-tungsten alloy materials, and the gap between the electrodes is adjustable by utilizing the set screw, so that the normal work of equipment is ensured, the electrode loss is reduced to the maximum extent, and the service life of the electrode is prolonged.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the defects of the prior art are overcome, and the shale oil-gas well operation pulse electrode structure is provided. The sealing device can ensure good sealing performance during high-dimensional pressure and high-frequency continuous work, reduces electrode loss to the maximum extent, and prolongs the service life of the electrode.

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

a shale oil and gas well operation pulse electrode structure comprising: the device comprises a cathode channel, an anode channel, an insulating layer and a sealing O-shaped ring; wherein the content of the first and second substances,

the cathode channel comprises a cathode wiring end, an outer connecting cylinder, an inclined leading head, an inner hexagonal plug, a set screw and an adjustable cathode electrode,

the cathode terminal is fixedly connected with the outer connecting cylinder,

the outer connecting cylinder is fixedly connected with the inclined guiding head,

the height of the adjustable cathode electrode is adjusted through threads, and the adjustable cathode electrode is fixed with a set screw through an inner hexagonal plug;

the anode channel comprises an anode wiring terminal, a first anode post, a second anode post and an anode electrode,

the anode terminal is fixedly connected with the first copper column,

the first copper column is fixedly connected with the second copper column,

the second copper column is fixedly connected with the anode electrode;

the insulating layer comprises an upper end insulating layer and a lower end insulating layer;

preferably, the adjustable cathode electrode and the anode electrode are made of carbon-tungsten alloy.

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

Preferably, the insulating layer is made of polytetrafluoroethylene.

Preferably, the cathode terminal, the outer connecting cylinder and the inclined guiding head are made of stainless steel materials.

Preferably, the anode wiring terminal, the first anode post and the second anode post are made of copper materials.

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

(1) the electrode material adopted by the invention is carbon-tungsten alloy, and has high hardness and strong anti-corrosion capability. The cathode 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 contact surfaces of different materials are subjected to pressure-resistant sealing by adopting sealing O-shaped rings, the pressure-resistant sealing grade reaches 40MPa, and the device is suitable for the depths of various unconventional shale oil and gas wells.

(2) The shale oil and gas well operation pulse electrode structure provided by the invention can effectively overcome the defects of the traditional electrode, provides high-frequency, continuous and stable high-strength pulse shock waves, and induces the resonance of a target reservoir stratum by continuously acting the high-energy shock waves with the natural frequency of the target reservoir stratum on the reservoir stratum, so that the porosity of the reservoir stratum is greatly improved, the development of reservoir stratum cracks is promoted, the permeability is improved, and the purposes of stable yield and yield increase of shale oil and gas are achieved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.

The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.

Fig. 1 is a structural view of a pulse electrode assembly for oil and gas well operations according to the present invention.

The reference numerals are explained below:

1-1, a cathode terminal; 1-2, an outer connecting cylinder; 1-3, leading the oblique head; 1-4, inner hexagonal plug; 1-5, tightening a screw; 2-1, an upper end insulating layer; 2-2, a lower end insulating layer; 3-1, an anode terminal; 3-2, a first anode post; 3-3, a second anode post; 4-1, sealing the O-shaped ring; 4-2, sealing the O-shaped ring; 4-3, sealing the O-shaped ring; 4-4, sealing the O-shaped ring; 4-5, sealing the O-shaped ring; 4-6, sealing the O-shaped ring; 5. an anode electrode; 6. a tunable cathode electrode.

Detailed Description

The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1, the present invention provides a shale oil and gas well operation pulse electrode structure. The sealing device can ensure good sealing performance during high-dimensional pressure and high-frequency continuous work, reduces electrode loss to the maximum extent, and prolongs the service life of the electrode. The method comprises the following steps: the device comprises a cathode channel, an anode channel, an insulating layer and a sealing O-shaped ring; wherein the content of the first and second substances,

the cathode channel comprises a cathode wiring end, an outer connecting cylinder, an inclined leading head, an inner hexagonal plug, a set screw and an adjustable cathode electrode,

the cathode terminal is fixedly connected with the outer connecting cylinder,

the outer connecting cylinder is fixedly connected with the inclined guiding head,

the height of the adjustable cathode electrode is adjusted through threads, and the adjustable cathode electrode is fixed with a set screw through an inner hexagonal plug;

the anode channel comprises an anode wiring terminal, a first anode post, a second anode post and an anode electrode,

the anode terminal is fixedly connected with the first copper column,

the first copper column is fixedly connected with the second copper column,

the second copper column is fixedly connected with the anode electrode;

the insulating layer comprises an upper end insulating layer and a lower end insulating layer;

preferably, the adjustable cathode electrode and the anode electrode are made of carbon-tungsten alloy.

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

Preferably, the insulating layer is made of polytetrafluoroethylene.

Preferably, the cathode terminal, the outer connecting cylinder and the inclined guiding head are made of stainless steel materials.

Preferably, the anode wiring terminal, the first anode post and the second anode post are made of copper materials.

The electrode material adopted by the invention is carbon-tungsten alloy, and has high hardness and strong anti-corrosion capability. The cathode 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 contact surfaces of different materials are subjected to pressure-resistant sealing by adopting sealing O-shaped rings, the pressure-resistant sealing grade reaches 40MPa, and the device is suitable for the depths of various unconventional shale oil and gas wells.

The shale oil and gas well operation pulse electrode structure provided by the invention can effectively overcome the defects of the traditional electrode, provides high-frequency, continuous and stable high-strength pulse shock waves, and induces the resonance of a target reservoir stratum by continuously acting the high-energy shock waves with the natural frequency of the target reservoir stratum on the reservoir stratum, so that the porosity of the reservoir stratum is greatly improved, the development of reservoir stratum cracks is promoted, the permeability is improved, and the purposes of stable yield and yield increase of shale oil and gas are achieved.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent change and modification made to the above embodiment according to the technical spirit of the present invention are within the scope of the present invention without departing from the technical spirit of the present invention.