CN111911117A - Combustible ice exploitation pipe column heated by stratum energy and operation method thereof - Google Patents
Combustible ice exploitation pipe column heated by stratum energy and operation method thereof Download PDFInfo
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- CN111911117A CN111911117A CN202010543951.9A CN202010543951A CN111911117A CN 111911117 A CN111911117 A CN 111911117A CN 202010543951 A CN202010543951 A CN 202010543951A CN 111911117 A CN111911117 A CN 111911117A
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- production
- allocator
- hydrate
- oil pipe
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/01—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells specially adapted for obtaining from underwater installations
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/34—Arrangements for separating materials produced by the well
- E21B43/38—Arrangements for separating materials produced by the well in the well
Abstract
The invention discloses a combustible ice production string heated by utilizing formation energy and an operation method thereof, wherein the combustible ice production string comprises a separation gas oil pipe, a separation liquid oil pipe, a liquid flow converter, a liquid flow bypass pipeline, an ESP packer, a sand prevention packer, a filling pump system, a first production allocator, a second production allocator and a third production allocator; according to the invention, the combustible ice exploitation tubular column is heated by utilizing the formation energy, so that the water body is heated in the exploitation process, the secondary formation of the hydrate and the heat-drive temperature rise of the hydrate exploitation layer without moving the tubular column are prevented, and the heating energy consumption is saved. The proportion of geothermal water and hydrate is adjusted through the adjustable production allocator, so that the temperature control of the produced water is realized. The designed liquid flow converter realizes the steering and shunting of the separated gas and the produced liquid, and is convenient for controlling the fluid in the pipe column.
Description
Technical Field
The invention belongs to the technical field of combustible ice exploitation, and particularly relates to a combustible ice exploitation tubular column heated by using stratum energy and an operation method thereof.
Background
During the exploitation of combustible ice, pressure reduction method, thermal activation method, chemical agent injection method and the like are mainly adopted. The depressurization method is a main method for trying to produce the hydrate at present, wherein the combustible ice is promoted to be decomposed by reducing the pressure of a reservoir, liquid water in the reservoir or free gas at the bottom is pumped out, so that the formation pressure is reduced, and the combustible ice is promoted to be decomposed.
The separation of natural gas and water is realized underground in the process of exploiting by the depressurization method, and in the process of lifting the natural gas to the ground, hydrate is likely to be formed again along with the increase of pressure in a shaft, so that pipelines are blocked, and the exploitation of the hydrate is influenced. It is considered desirable to heat the separated natural gas downhole to avoid hydrate formation.
The patent of application No. 201710027757 proposes a laboratory instrument for decomposing natural gas hydrate by electromagnetic induction, which cannot satisfy large-scale industrial exploitation of combustible ice. The electromagnetic heating device with the application number of 201910128714.3 for exploiting the seabed combustible ice needs to utilize ground energy to carry out electromagnetic heating, and is large in power consumption and unobvious in energy-saving effect.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a combustible ice exploitation tubular column heated by using formation energy and an operation method thereof. The lower geothermal water is used for heating the hydrate exploitation layer, so that the separation efficiency is improved, and the separated natural gas is heated at the same time, thereby preventing the formation of secondary hydrate. Meanwhile, the thermal drive heating of the immobile pipe column of the hydrate producing layer can be realized by adjusting the water nozzle of the production allocator. The hydrate exploitation tubular column reduces the application of ground energy, can proportion geothermal water in real time through the production allocator, achieves the purpose of temperature control, overcomes the defect that the ground is required to be heated in the traditional hydrate exploitation, fully utilizes the formation energy, saves the ground energy, and provides a new tubular column and a new method for exploiting the offshore combustible ice.
The invention is realized by the following technical scheme:
a combustible ice production string heated by utilizing formation energy comprises a separation gas oil pipe, a separation liquid oil pipe, a liquid flow converter, a liquid flow bypass pipeline, an ESP packer, a sand prevention packer, a filling pump system, a first production allocator, a second production allocator and a third production allocator;
the upper end of the separation gas-oil pipe is connected with a water surface exploitation device, the separation gas-oil pipe is provided with a BOP (blow-in-process) and an underwater test tree, the joint of the lower end of the separation gas-oil pipe and the separation liquid oil pipe is provided with a liquid flow converter and an ESP (electronic stability program) packer, a liquid production annulus is formed above the ESP packer, the upper end of the separation liquid oil pipe is communicated with the liquid production annulus through a separation liquid outlet of the liquid flow converter, and the liquid production annulus is connected to the water surface exploitation device through a;
the sand prevention packer is arranged above the hydrate production layer, a gas production annulus is formed between the ESP packer and the sand prevention packer, and the lower end of the separated gas oil pipe is communicated with the gas production annulus through a separated gas inlet of the liquid flow converter; the sand prevention packer is provided with a pipe column hanger which is used for positioning and installing a separation liquid oil pipe and allowing separation gas to pass through so that a gas production annulus is communicated with a hydrate production layer;
the lower end of the separation liquid oil pipe penetrates through the hydrate exploitation layer and extends into the geothermal layer, and the separation liquid oil pipe is provided with a first production allocator, a filling pump, a second production allocator and a third production allocator from top to bottom; the first production allocator is positioned in the gas production annulus, the second production allocator is positioned in the hydrate production layer, and the third production allocator is positioned in the geothermal layer.
In the technical scheme, the first production allocator, the second production allocator and the third production allocator are connected with the water surface mining device through production allocator control cables.
An operation method of a combustible ice exploitation tubular column heated by stratum energy comprises exploitation operation and geothermal drive operation, and comprises the following steps:
first, mining operation
Turning on an electric pump, turning off a first production allocator, turning on a second production allocator and a third production allocator, after the pump is started, carrying out depressurization decomposition on the hydrate, mixing the water subjected to depressurization decomposition of the hydrate with geothermal layer water to increase the temperature, lifting the mixture to the ground through a separation liquid oil pipe and a liquid flow bypass pipeline by the electric pump, and adjusting the ratio of geothermal water to water ratio by adjusting the opening ratio of water nozzles of the second production allocator and the third production allocator so as to control the extraction temperature; and gas after the hydrate is decompressed and decomposed is collected to the ground through a gas production annulus and a separated gas oil pipe.
Second, geothermal driving operation
And closing the second production allocator, opening the first and third production allocators, closing the liquid flow by-pass pipe and the wellhead, allowing geothermal water to enter a separation liquid oil pipe through the third production allocator, pressurizing by an electric pump, discharging from a water nozzle of the first production allocator, allowing the geothermal water to enter a gas production annulus, and allowing the geothermal water to enter a hydrate production layer through a pore passage of a pipe column hanger, so that the thermal drive heating of a hydrate formation is realized.
The invention has the advantages and beneficial effects that:
by arranging the combustible ice exploitation tubular column which is heated by utilizing the stratum energy, the water body heating in the exploitation process is realized, the secondary formation of the hydrate and the heat-drive temperature rise of the hydrate exploitation layer without moving the tubular column are prevented, and the heating energy consumption is saved. The proportion of geothermal water and hydrate is adjusted through the adjustable production allocator, so that the temperature control of the produced water is realized. The designed liquid flow converter realizes the steering and shunting of the separated gas and the produced liquid, and is convenient for controlling the fluid in the pipe column.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
FIG. 2 is a schematic illustration of a hydrate production process.
FIG. 3 is a schematic diagram of a hydrate formation thermal flooding temperature increase process.
Wherein: 1. a surface mining device, 2, a liquid flow bypass pipeline, 3, a BOP and underwater test tree, 4, a separation gas oil pipe, 5, an ESP packer, 6, a separation liquid oil pipe, 7, a first production allocator, 8, a sleeve, 9, an electric pump cable, 10 and a filling pump, 11 are a pipe column hanger, 12, a sand prevention packer, 13, a second production allocator, 14, a third production allocator, 15, a separation liquid outlet, 16, a liquid flow separator, 17, a separation gas inlet, 18 and a production allocator control cable;
101. a separation liquid flow 102, a separation gas flow 103 and a geothermal flooding flow;
201. hydrate producing layer, 202, geothermal layer.
For a person skilled in the art, other relevant figures can be obtained from the above figures without inventive effort.
Detailed Description
In order to make the technical solution of the present invention better understood, the technical solution of the present invention is further described below with reference to specific examples.
Examples
A combustible ice production string heated by utilizing formation energy comprises a separation gas oil pipe, a separation liquid oil pipe, a liquid flow converter, a liquid flow bypass pipeline, an ESP packer, a sand prevention packer, a filling pump system, a first production allocator, a second production allocator and a third production allocator;
the upper end of the separation gas-oil pipe is connected with a water surface exploitation device, the separation gas-oil pipe is provided with a BOP (blow-in-process) and an underwater test tree, the joint of the lower end of the separation gas-oil pipe and the separation liquid oil pipe is provided with a liquid flow converter and an ESP (electronic stability program) packer, a liquid production annulus is formed above the ESP packer, the upper end of the separation liquid oil pipe is communicated with the liquid production annulus through a separation liquid outlet of the liquid flow converter, and the liquid production annulus is connected to the water surface exploitation device through a;
the sand prevention packer is arranged above the hydrate production layer, a gas production annulus is formed between the ESP packer and the sand prevention packer, and the lower end of the separated gas oil pipe is communicated with the gas production annulus through a separated gas inlet of the liquid flow converter; the sand prevention packer is provided with a pipe column hanger which is used for positioning and installing a separation liquid oil pipe and allowing separation gas to pass through so that a gas production annulus is communicated with a hydrate production layer;
the lower end of the separation liquid oil pipe penetrates through the hydrate exploitation layer and extends into the geothermal layer, and the separation liquid oil pipe is provided with a first production allocator, a filling pump, a second production allocator and a third production allocator from top to bottom; the first production allocator is positioned in the gas production annulus, the second production allocator is positioned in the hydrate production layer, and the third production allocator is positioned in the geothermal layer. The first production allocator, the second production allocator and the third production allocator are connected with the water surface mining device through production allocator control cables.
The oil pipe hanger is positioned on the upper part of the sand prevention packer and used for hanging the lower oil pipe and positioning the pipe column, and the oil pipe hanger is provided with a flow passage which can ensure that separated gas and reinjection hot water pass through.
The liquid flow converter realizes that liquid in a central tube at the lower part of the converter flows into an upper oil sleeve annulus through the converter by arranging an internal channel. And the separated gas in the oil sleeve annulus at the lower part of the liquid flow converter enters the central tube at the upper part through the converter, so that the gas collection is realized.
The pipe column has the advantages that the gas-liquid separation is carried out by using the pipe column once, the drainage process is carried out by using the existing liquid path bypass pipe, the process is simple, the working conditions of the hydrate and the geothermal water in the well are monitored in real time through the production allocator and the pump, the ratio of the hydrate and the geothermal water is adjusted in real time through the production allocator, and the safe and efficient production is ensured. If the hydrate layer produces sand, the liquid sand carrying capacity can be adjusted by adjusting the proportion of the hydrate to the geothermal water, the geothermal water is adopted for heating, the heat of the water body is sufficient, and the energy efficiency is saved. The production allocation device is used for a layer switch of an interval, the 3 sets of production allocation devices adopt a single-core steel pipe cable to supply power and control, parameters such as temperature, pressure and flow at positions can be monitored in real time, meanwhile, the opening degree of a water nozzle of a water inlet hole can be independently adjusted for the designated production allocation device, and the requirements of real-time testing and regulation are met.
The tubular column is provided with 2 development modes. First when normal production, close first production allocator, open second, third production allocator, play the pump after, hydrate through decompression decomposition, water and ground heating layer water mixture heating after hydrate decompression decomposition rise to ground through the electric submersible pump, hot water is used for the oil pipe heating, prevents that the hydrate secondary from forming. And the ratio of geothermal water to produced water is adjusted by adjusting the opening ratio of the water nozzles of the second and third production distributors, so that the produced temperature is controlled. And gas after the hydrate is decompressed and decomposed is collected to the ground through a gas production annulus and a separated gas oil pipe. Secondly, the temperature of a hydrate layer exploitation reservoir is reduced, the thermal drive heating of the pipe column can be realized without moving the pipe column, and the formation temperature required by hydrate exploitation is ensured. And closing the second production allocator, opening the first and third production allocators, closing the liquid flow by-pass pipe and the wellhead, allowing geothermal water to enter the central pipe through the third production allocator, pressurizing by an electric pump, discharging from the water nozzle of the first production allocator, allowing the geothermal water to enter the annular space of the oil sleeve, and allowing the geothermal water to enter the hydrate exploitation layer through the pore passage of the pipe column hanger, thereby realizing thermal drive heating of the hydrate formation.
The working principle of the invention is as follows:
and when the tubular column for combustible ice exploitation is heated by using formation energy, high-temperature water produced by the geothermal layer enters the separation liquid oil pipe through a water nozzle of the third production allocator during normal operation. And starting a filling pump, reducing the pressure of the layer position of the hydrate production layer, reducing the pressure of the hydrate for decomposition, allowing the decomposed gas to enter an upper oil jacket space through a channel of the pipe column hanger and enter an upper separation gas-oil pipe of the ESP packer through a liquid flow converter, so that the gas is collected, wherein the gas flow is as shown as 102 in figure 2. Water separated from the hydrate enters the central pipe through a water nozzle of the second production allocator, separation liquid and bottom layer hot water are mixed to realize integral pipe column heating, secondary formation of the hydrate is prevented, and a liquid flow curve is shown as 101 in figure 2. The second production allocator and the third water allocator are in communication control with the ground by steel pipe cables. The internal integrated temperature, pressure, flow rate sensor and water nozzle adjusting mechanism. The distribution of the liquid production amount is realized by adjusting the opening of the second production allocator and the opening ratio of the third production allocator, so that the temperature of the produced liquid is adjusted, the water body temperature of the central pipe is guaranteed, the produced gas is heated, and the secondary formation of hydrates is prevented. During the hydrate exploitation process, the hydrate layer produces sand. And adjusting water nozzles of the second production allocator and the third water allocator to increase the water inflow, thereby improving the sand carrying capacity.
As the temperature of the hydrate exploitation layer is reduced in the hydrate exploitation process, the hydrate decomposition efficiency is reduced. And closing the water nozzles of the second production allocator, opening the water nozzles of the first production allocator and the third production allocator, and closing the liquid flow by-pass pipe and the wellhead. The produced liquid of the geothermal layer enters the central pipe through the water nozzle of the third production allocator, is pressurized through the electric pump, is discharged from the water nozzle of the first production allocator, enters the oil sleeve annulus, and enters the hydrate production layer through the pore canal of the pipe column hanger, so that the heat-driven temperature rise of the hydrate stratum without moving the pipe column is realized. The geothermal flooding flow is shown as 103 in fig. 3.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings). In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
The invention has been described in an illustrative manner, and it is to be understood that any simple variations, modifications or other equivalent changes which can be made by one skilled in the art without departing from the spirit of the invention fall within the scope of the invention.
Claims (3)
1. The utility model provides an utilize combustible ice exploitation tubular column of stratum energy heating which characterized in that: the system comprises a separation gas oil pipe, a separation liquid oil pipe, a liquid flow converter, a liquid flow bypass pipeline, an ESP packer, a sand prevention packer, a filling pump system, a first production allocator, a second production allocator and a third production allocator;
the upper end of the separation gas-oil pipe is connected with a water surface exploitation device, the separation gas-oil pipe is provided with a BOP (blow-in-process) and an underwater test tree, the joint of the lower end of the separation gas-oil pipe and the separation liquid oil pipe is provided with a liquid flow converter and an ESP (electronic stability program) packer, a liquid production annulus is formed above the ESP packer, the upper end of the separation liquid oil pipe is communicated with the liquid production annulus through a separation liquid outlet of the liquid flow converter, and the liquid production annulus is connected to the water surface exploitation device through a;
the sand prevention packer is arranged above the hydrate production layer, a gas production annulus is formed between the ESP packer and the sand prevention packer, and the lower end of the separated gas oil pipe is communicated with the gas production annulus through a separated gas inlet of the liquid flow converter; the sand prevention packer is provided with a pipe column hanger which is used for positioning and installing a separation liquid oil pipe and allowing separation gas to pass through so that a gas production annulus is communicated with a hydrate production layer;
the lower end of the separation liquid oil pipe penetrates through the hydrate exploitation layer and extends into the geothermal layer, and the separation liquid oil pipe is provided with a first production allocator, a filling pump, a second production allocator and a third production allocator from top to bottom; the first production allocator is positioned in the gas production annulus, the second production allocator is positioned in the hydrate production layer, and the third production allocator is positioned in the geothermal layer.
2. The combustible ice production string heated by formation energy according to claim 1, wherein: the first production allocator, the second production allocator and the third production allocator are connected with the water surface mining device through production allocator control cables.
3. An operation method of a combustible ice exploitation tubular column heated by using formation energy comprises exploitation operation and geothermal flooding operation, and is characterized by comprising the following steps:
first, mining operation
Turning on an electric pump, turning off a first production allocator, turning on a second production allocator and a third production allocator, after the pump is started, carrying out depressurization decomposition on the hydrate, mixing the water subjected to depressurization decomposition of the hydrate with geothermal layer water to increase the temperature, lifting the mixture to the ground through a separation liquid oil pipe and a liquid flow bypass pipeline by the electric pump, and adjusting the ratio of geothermal water to water ratio by adjusting the opening ratio of water nozzles of the second production allocator and the third production allocator so as to control the extraction temperature; gas obtained after the hydrate is decompressed and decomposed is collected to the ground through a gas production annulus and a separated gas oil pipe;
second, geothermal driving operation
And closing the second production allocator, opening the first and third production allocators, closing the liquid flow by-pass pipe and the wellhead, allowing geothermal water to enter a separation liquid oil pipe through the third production allocator, pressurizing by an electric pump, discharging from a water nozzle of the first production allocator, allowing the geothermal water to enter a gas production annulus, and allowing the geothermal water to enter a hydrate production layer through a pore passage of a pipe column hanger, so that the thermal drive heating of a hydrate formation is realized.
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| CN112343557A (en) * | 2020-12-18 | 2021-02-09 | 福州大学 | Sea area natural gas hydrate self-entry type exploitation device and exploitation method |
| CN115478827A (en) * | 2022-09-30 | 2022-12-16 | 广州海洋地质调查局 | Staged fracturing method for horizontal well casing unfixed well completion of hydrate reservoir |
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