CN215057293U

CN215057293U - Oil gas is micrite electric heat membrane heating device in pit

Info

Publication number: CN215057293U
Application number: CN202120791695.5U
Authority: CN
Inventors: 游利军; 王阳; 康毅力; 唐际锐; 陈一健
Original assignee: Southwest Petroleum University
Current assignee: Southwest Petroleum University
Priority date: 2021-04-19
Filing date: 2021-04-19
Publication date: 2021-12-07
Anticipated expiration: 2031-04-19

Abstract

The utility model discloses an oil gas is micrite electric heat membrane heating device in pit. The device mainly uses reservoir section oil pipe as bearing structure, installs sleeve type micrite electric plate as the main part that generates heat in the oil pipe outside, utilizes the characteristics that SnO2 micrite can circular telegram and strong infrared thermal radiation. The method can be used for effectively heating and evaporating liquid water in a near-wellbore zone of the reservoir during the production process of the dense gas, and nitrogen can also be injected into the annular space of the casing by pressurizing, and the nitrogen enters the reservoir along the perforation crack after being heated in the reservoir section to realize the removal of the trap damage of the deep water of the reservoir. The method can reduce the viscosity of the thick oil through heat radiation in the process of thick oil exploitation, and the heat energy can solve the problem of wax deposition of a tubing string in the process of high-pour-point oil exploitation. The device is simple and reliable in structure, and the oil gas recovery rate can be effectively improved by combining the method with high energy efficiency.

Description

Oil gas is micrite electric heat membrane heating device in pit

Technical Field

The utility model relates to an oil gas is micrite electric heat membrane heating device in pit can promote oil gas recovery ratio.

Background

Along with the increasing demand of petroleum and natural gas and the decreasing of conventional oil gas resources in China, the importance and the research heat and the day of unconventional oil gas exploration and development are greatly increased. In recent years, the range of unconventional oil and gas resources is widened from traditional coal bed gas, sandstone gas, heavy oil, high-pour-point oil and the like to the fields of compact oil, compact sandstone gas, shale gas and the like, the resource types are continuously increased, and the resource structure and the knowledge are gradually changed. The emergence of new resources brings new problems and challenges, for example, tight gas reservoirs generally do not have natural energy capacity, a reservoir is required to be modified, hydraulic fracturing is generally adopted for making seams, but the fracturing fluid is difficult to flow back, a large amount of fracturing fluid is retained in the reservoir, so that the water phase trapping damage seriously affects the recovery ratio of tight sandstone gas. The yield is severely restricted by the problems of high viscosity in the process of thick oil exploitation, easy wax deposition in an oil pipe in the process of high-pour-point oil exploitation and the like. There is a need for a stable, reliable, economical, and efficient downhole heating device to solve the above problems.

The utility model aims to avoid above-mentioned current heating device's weak point in pit and provide a brand-new heating device it has good reliability, easily operation, be convenient for maintain, excellent characteristics such as energy efficiency relative altitude.

Compared with the method and the device for removing the water phase trapping damage of the low-permeability tight sandstone gas layer disclosed by the Chinese patent publication No. CN 102536165A, the method mainly generates microwaves through a microwave generating device in a shaft and transmits the microwaves to the reservoir, and the microwaves enable internal molecules of liquid water to resonate to generate molecular heat so as to heat the liquid water to be water vapor and remove the water phase trapping damage. The device has the characteristics of high efficiency, high heat energy utilization rate and environmental protection, but is limited by the underground space to limit the power of the microwave generator to be impossible to be too high, so that the heating range is very small, in addition, the device is only used for oil and gas wells adopting an open hole completion mode, and because most of other completion modes use metal sleeves and metal can shield microwaves, the device has great limitation.

Compared with the method for removing the water phase trapping damage at high temperature in the oil and gas exploitation process disclosed in the Chinese patent publication No. CN 103790552A, the method mainly comprises the steps of heating a casing pipe under a reservoir section such as a resistance heating rod in a heat radiation mode by utilizing the high temperature of the resistance heating rod, then bringing heat into the reservoir through a heat conduction mode among the casing pipe, a cement ring and the reservoir, and changing liquid water into steam to be discharged through the high temperature so as to remove the water phase trapping damage. The method has the characteristics that the heating mode is simple and reliable, but the heat utilization rate is low, the heat loss along the direction of the sleeve is large, and therefore, the power of the electric heating rod can only be improved to achieve the effect of relieving. And the device is difficult to heat deep reservoirs far away from the wellbore due to the high thermal resistance of the rock.

In addition, there are some other reservoir heating technologies, without exception, which have unavoidable defects, low heating efficiency, poor economy, great construction difficulty and low reliability.

Disclosure of Invention

The utility model provides a technical problem provide an oil gas is micrite electrothermal film heating device in pit in order to promote oil gas recovery ratio.

The utility model provides a technical scheme that its technical problem adopted is: the oil pipe of the reservoir section is used as a supporting device, then a sleeve-type microcrystalline ceramic heating panel is arranged on the outer side of the oil pipe and used as a heating core part of the whole heating device, two electrode plates are arranged on the upper side of the heating panel and are connected with a ground power supply device through electric wires, and the device further comprises an external nitrogen supply device (see the attached drawing in detail.)

Further, the method comprises the following steps: the sleeve type microcrystalline ceramic heating panel is formed by mixing SnO₂Plating on ceramic panel to form a layer of SnO₂And (4) a microcrystalline layer.

Further, the method comprises the following steps: the reservoir section oil pipe is one part of the device and the oil pipe of the oil well body is two sections of oil pipes.

Further, the method comprises the following steps: the oil pipe of the reservoir section is externally provided with threads, the sleeve type microcrystalline ceramic heating panel is internally provided with threads, and the reservoir section oil pipe and the sleeve type microcrystalline ceramic heating panel are connected through the internal threads and the external threads.

Further, the method comprises the following steps: the length of the cylindrical microcrystalline ceramic heating panel can be as long as the length of an oil pipe of the reservoir section as required, and the cylindrical microcrystalline ceramic heating panel is installed on the outer side of the oil pipe of the reservoir section by screwing.

Further, the method comprises the following steps: the external nitrogen supply device comprises a nitrogen generating device and a pressure pump which are connected through a pipeline, and a nitrogen system is connected with the sleeve through a pipeline and adopts mechanical seal.

Further, the method comprises the following steps: and a small section of heat-insulating oil pipe is arranged between the two sections of oil pipes and is used for connecting the two sections of oil pipes.

The invention has the advantages and beneficial effects that:

1. the microcrystalline ceramic material is stable, reliable and corrosion-resistant, has high heating efficiency and generates heat uniformly;

2. the method can be used for removing the damage of water phase trapping of the gas well and can also be used for solving the problems of wax deposition in the processes of viscosity reduction in heavy oil recovery and high pour point oil recovery;

3. the heating area is flexible and controllable, the width of the heating area can be controlled by changing the length of the additionally-installed microcrystalline panel, and the heating range of the storage area can be expanded in a gas injection mode;

4. the engineering implementation difficulty is small, the heating temperature is controllable, and the sleeve-type microcrystalline ceramic heating panel radiates heat to the periphery by taking the oil pipe of the reservoir section as the center to avoid the dissipation of heat in the longitudinal direction;

5. the method has wide application, can be applied to oil and gas wells of any drilling and completion mode and is suitable for various working conditions.

Drawings

FIG. 1 shows the flow chart of the construction process in the well site

In the figure: 1 denotes a power supply, 2 denotes a nitrogen pipeline, 3 denotes an external nitrogen supply device, and 6 denotes a reservoir section fracture.

FIG. 2 is a schematic view of the main structure of an oil pipe

In the figure: 4 denotes casing, 5 denotes oil well tubing, 8 denotes reservoir formation tubing (externally threaded), and 9 denotes a thermally insulated section.

FIG. 3 is a schematic view of the main structure of a sleeve-type microcrystalline ceramic heating panel

In the figure: 7 represents SnO₂The microcrystalline plating layer 10 denotes an electrode sheet, 11 denotes a ceramic layer, and 12 denotes a power supply cable.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings.

See fig. 1, fig. 2, fig. 3.

The power supply 1 is connected with SnO through a power supply cable 12₂ Electrode sheet 11 on microcrystal coating 7, sleeve type microcrystal ceramic

The heating panel is connected with the reservoir section oil pipe 8 through threads and is installed in a screwing mode.

When a reservoir in a near-well region needs to be heated or heavy oil high-condensation oil is exploited, corresponding voltage is applied to the sleeve type microcrystalline ceramic heating panel according to the required temperature.

When a deep reservoir needs to be heated (the problem of water phase trap damage of a compact gas reservoir is solved), after the sleeve type microcrystalline ceramic heating panel is electrified, the external nitrogen supply device 3 utilizes the nitrogen pipeline 2 to pressurize and inject nitrogen into the annular space of the sleeve through the pressure pump, and the nitrogen enters the deep reservoir along the reservoir section crack 6 after being heated in the reservoir section area to complete heating of the deep reservoir. After heating, the nitrogen is discharged to the ground along the casing 4 and the oil pipe 5 of the oil well body.

Claims

1. The utility model provides an oil gas is micrite electric heat membrane heating device in pit, its characterized in that, device include oil well shaft oil pipe, reservoir section oil pipe, sleeve type micrite pottery generate heat panel, external nitrogen system and supply cable, two electrode slices are installed to sleeve type micrite pottery generate heat panel upside, and the electrode slice passes through supply cable and links to each other with the power.

2. The oil and gas downhole microcrystalline electrothermal film heating device of claim 1, wherein the sleeve type microcrystalline ceramic heating panel is formed by SnO₂Plating on ceramic panel to form a layer of SnO₂And (4) a microcrystalline layer.

3. The downhole microcrystalline electrothermal film heating apparatus of claim 1, wherein the reservoir section tubing and the well bore tubing are two sections of tubing.

4. The downhole microcrystalline electrothermal film heating device for oil and gas as claimed in claim 1, wherein the reservoir section has threads outside the oil pipe, and the sleeve type microcrystalline ceramic heating panel has threads inside, and the reservoir section and the sleeve type microcrystalline ceramic heating panel are connected through the internal threads and the external threads.

5. The oil and gas downhole microcrystalline electrothermal film heating device of claim 1, wherein the external nitrogen system comprises a nitrogen generation device and a pressure pump which are connected through a pipeline, and the external nitrogen system is connected with the casing through a pipeline and adopts mechanical seal.

6. The downhole micro-crystalline electrothermal film heating device for oil and gas as claimed in claim 3, wherein a small section of insulated oil pipe is arranged between the two sections of oil pipe for connecting the two sections of oil pipe.