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CN109538200B - Structure for preventing pore canal ice blockage and blockage removal in hydrate reservoir experiment process - Google Patents

Structure for preventing pore canal ice blockage and blockage removal in hydrate reservoir experiment process Download PDF

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Publication number
CN109538200B
CN109538200B CN201910072207.2A CN201910072207A CN109538200B CN 109538200 B CN109538200 B CN 109538200B CN 201910072207 A CN201910072207 A CN 201910072207A CN 109538200 B CN109538200 B CN 109538200B
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annular coil
coil pipe
gas injection
pipe
outlet
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CN109538200A (en
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邢义良
刘�文
赵鑫
胡冠华
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Saineng Tuoke Beijing Energy Technology Co ltd
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Beijing Ruilaibo Petroleum Technology Co ltd
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    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B49/00Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

The invention relates to a structure for preventing pore ice blockage and blockage removal in a hydrate reservoir experiment process, wherein a sand prevention filter element is arranged at the middle lower part of an inner cavity of a high-pressure cabin body, an air injection cavity is formed at the lower part of the sand prevention filter element, an annular coil pipe is arranged in the air injection cavity and is provided with an annular coil pipe inlet and an annular coil pipe outlet, the annular coil pipe inlet and the annular coil pipe outlet are fixedly connected with the bottom of the high-pressure cabin body through annular coil pipe sealing joints, the annular coil pipe inlet is communicated with an outlet of peripheral oil bath heating equipment, the annular coil pipe outlet is communicated with an inlet of the peripheral oil bath heating equipment, and circulating hot oil is filled in the annular coil pipe. The structure for ice blocking and unblocking the pore canal has the following beneficial effects: 1. the structure is simple. 2. The stability and reliability of the reservoir forming experiment of the hydrate reservoir are improved. 3. The experimental efficiency is improved, and the experimental period is shortened. 4. The method effectively eliminates the blocking phenomenon of hydrate pore canals and ensures the continuity and the authenticity of experiments.

Description

Structure for preventing pore canal ice blockage and blockage removal in hydrate reservoir experiment process
Technical Field
The invention relates to a structure for preventing pore canal ice blocking and unblocking in the experimental process of a hydrate reservoir, which is applied to the experimental fields of exploration and development of the front end of the hydrate reservoir and the like.
Background
At present, in the fields of hydrate exploration and development and the like, the simulation of related theory and experimental models of some laboratory scale is required to be carried out frequently, in the simulation process of the experiment, the condition of an actual stratum is required to be simulated frequently, quartz sand is required to be filled in a hyperbaric chamber, the condition of an original stratum is simulated through the gas injection and water injection operation in the sand, and after the conditions are met, the simulation of the reservoir formation process of the hydrate reservoir is required to be carried out, which is also a basic experiment in the readiness stage of other experiments such as comprehensive exploitation, sand prevention and the like.
The simulation experiment of the hydrate reservoir forming process is carried out in a low-temperature and high-pressure environment, the hydrate is produced through the chemical reaction of water molecules and a plurality of methane molecules under the condition, in the process, the experiment condition of the low-temperature and high-pressure is required to be kept for a long time by equipment, the equipment of the hydrate experiment is required to carry out real-time monitoring on the reservoir forming condition, the temperature and pressure condition and the circulating gas injection condition at the bottom of a model under various conditions in the whole simulation process, the temperature and pressure change condition of the hydrate in the reservoir forming process are monitored to judge the stage of the hydrate reservoir forming and the condition of the reservoir forming, in the reservoir forming process, sand and water are mixed in a certain proportion during early sand filling, then sand is put into a high-pressure chamber, in addition, the compaction operation is carried out, gas and water are prevented from flowing into the high-pressure chamber along the inner side of the equipment, the methane gas is injected into the high-pressure chamber along the bottom of the equipment under the low temperature, the efficiency of the reservoir forming of the hydrate is improved, in the circulating process, freezing or natural gas hydrate forming can occur frequently in pore channels or channels at the gas inlets and the measuring points in the circulating process, the pore channels in the process, the pore channels are often, the ice formation is formed, the ice formation phenomenon is caused, the ice formation is often occurs, the pore channel forming phenomenon is influenced, the experiment effect is greatly influenced, the effect of the experiment is not influenced, and the effect of the experiment can be greatly influenced by the formation of the effect forming the experiment process, and the effect is not influenced by the formation of the process, and the experiment effect is greatly forming the process, and can be greatly influenced. Aiming at the defects of the experimental equipment, a structure for preventing the blocking and the unblocking of the pore canal in the hydrate reservoir experimental process is provided in the whole experimental equipment.
Disclosure of Invention
The invention aims to: the invention is to the above-mentioned existing technical problem to make improvement, namely the invention has disclosed a structure for preventing the ice of the tunnel from blocking up and unblocking in the experiment process of hydrate reservoir, it is to carry on the local optimization design to change the structure on the basis of original apparatus, in the original apparatus, generally through placing quartz sand of a certain number of mesh to simulate the stratum condition in the interior, and mix certain proportion of water in advance in the sand grain, after compacting sand and water in the model, compress the model upper cover, and fasten with the bolt, prefabricated the sand-proof filter core in advance in the bottom of quartz sand, can prevent sand from revealing, pour into the cavity of the lower end of the filter core into methane gas at the same time, then mix with quartz sand fully, pour into upwards circularly, raise and become and store the efficiency.
The invention discloses a structure for preventing ice blocking and unblocking of a pore canal in a hydrate reservoir experiment process, which is characterized in that an annular coil is designed and added at the lower end of a sand prevention filter element on the basis of original equipment, a heating oil bath is filled in the annular coil, so that an inlet channel of methane gas can be heated, a heated cavity can ensure that the gas and the gas channel can not block an air inlet channel of the equipment due to the formation of ice-like substances due to hydrate reservoir formation, meanwhile, the heating oil bath can control the temperature outside, the pore canal which is ice blocked can be unblocked by heating hot bath oil, the ice-like hydrate in the channel is decomposed and the channel is opened, and anti-ice blocking and unblocking treatment is performed by adding the heating coil at the bottom of the equipment.
The technical scheme is as follows: a structure for preventing pore canal ice blocking and unblocking in the hydrate reservoir experimental process is provided, wherein a sand prevention filter element is arranged at the middle lower part of an inner cavity of a high-pressure cabin body, and a gas injection cavity is formed at the lower part of the sand prevention filter element, wherein:
an annular coil pipe is arranged in the gas injection cavity, the annular coil pipe is provided with an annular coil pipe inlet and an annular coil pipe outlet, the annular coil pipe inlet and the annular coil pipe outlet are fixedly connected with the bottom of the high-pressure cabin body through annular coil pipe sealing joints, the annular coil pipe inlet is communicated with an outlet of peripheral oil bath heating equipment, the annular coil pipe outlet is communicated with an inlet of the peripheral oil bath heating equipment, and circulating hot oil is filled in the annular coil pipe.
Further, the annular coil inlet and the annular coil outlet are fixedly connected with the bottom of the high-pressure cabin body in a threaded connection mode through annular coil sealing joints.
Further, the top of the high-pressure cabin body is provided with an open cylindrical inner cavity, and the upper cover of the high-pressure cabin body is fixedly connected with the top side of the high-pressure cabin body through a locking bolt.
Further, a sealing ring is arranged between the upper cover of the high-pressure chamber and the top side of the high-pressure chamber.
Further, quartz sand and water are arranged in an inner cavity at the upper part of the sand control filter element.
Furthermore, the upper cover of the high-pressure cabin is also provided with a plurality of column measuring components, the column measuring components are hollow pipe fittings, two ends of the column measuring components are respectively communicated with the atmosphere and the inner cavity of the high-pressure cabin body, and a circuit bus is sleeved in the column measuring components.
Further, an air injection main pipe is arranged in the air injection cavity, a plurality of air injection pipe multi-way branches are uniformly arranged at the upper part of the air injection main pipe, the air injection main pipe is provided with an air injection pipe inlet, and the air injection pipe inlet is fixedly connected with the bottom of the high-pressure cabin body through an air injection pipe sealing joint;
the outlet of the gas injection pipe is fixedly connected with the upper cover of the high-pressure cabin through a sealing joint of the outlet of the gas injection pipe, and the inner cavity of the upper part of the sand control filter element is communicated with the outside.
The beneficial effects are that: the structure for preventing the ice blockage and the blockage removal of the pore canal in the hydrate reservoir experiment process has the following beneficial effects:
1. the structure of original equipment is not broken, and the heating of the annular coil pipe is performed in the sealed cavity of the gas injection end of the original equipment, so that the generation of ice blockage of hydrate is effectively prevented.
2. The method of adding the annular coil inside is adopted for heating, so that the stability and the reliability of the hydrate reservoir forming experiment process are improved, and the experiment loss is reduced to the greatest extent.
3. According to experimental conditions, the whole experimental process is free of pore channel blockage, the experimental efficiency is greatly improved, and the experimental period is shortened.
4. By adopting the structure, the blocking phenomenon of the hydrate pore canal is effectively eliminated, the continuity of the experiment is ensured, the actual situation of the stratum is simulated more truly and accurately, and more reliable and more accurate data are provided for actual production.
Drawings
FIG. 1 is a schematic diagram of a structure for preventing ice blockage and unblocking of a pore canal during a hydrate reservoir experiment;
FIG. 2 is a schematic view of a gas injection cavity;
FIG. 3 is a schematic view of an annular coil;
Wherein:
1-Circuit bus 2-Lock bolt
3-Hyperbaric chamber upper cover 4-sealing ring
5-Hyperbaric chamber 6-measuring column assembly
7-Quartz sand 8-sand control filter element
9-Gas injection cavity 10-annular coil pipe
12-Ring coil sealing joint
13-Annular coil inlet 14-gas injection pipe sealing joint
15-Gas injection pipe inlet 16-annular coil outlet
17-Gas injection main pipe 18-gas injection pipe multi-way branch
19-Gas injection pipe outlet 20-gas injection pipe outlet sealing joint
Detailed Description
The following detailed description of specific embodiments of the invention.
As shown in fig. 1-3, a structure for preventing ice blockage and unblocking of a pore canal in a hydrate reservoir experiment process is provided, wherein a sand control filter element 8 is arranged at the middle lower part of an inner cavity of a high-pressure cabin body 5, and an air injection cavity 9 is formed at the lower part of the sand control filter element 8, wherein:
An annular coil pipe 10 is arranged in the gas injection cavity 9, the annular coil pipe 10 is provided with an annular coil pipe inlet 13 and an annular coil pipe outlet 16, the annular coil pipe inlet 13 and the annular coil pipe outlet 16 are fixedly connected with the bottom of the high-pressure cabin 5 through an annular coil pipe sealing joint 12, the annular coil pipe inlet 13 is communicated with an outlet of peripheral oil bath heating equipment, the annular coil pipe outlet 16 is communicated with an inlet of the peripheral oil bath heating equipment, and circulating hot oil is filled in the annular coil pipe 10.
Further, the annular coil inlet 13 and the annular coil outlet 16 are fixedly connected with the bottom of the high-pressure cabin 5 in a threaded manner through the annular coil sealing joint 12.
Further, the top of the high-pressure cabin body 5 is provided with an open cylindrical inner cavity, and the upper cover 3 of the high-pressure cabin is fixedly connected with the top side of the high-pressure cabin body 5 through a locking bolt 2.
Further, a sealing ring 4 is provided between the upper cover 3 of the high pressure chamber and the top side of the high pressure chamber 5.
Further, quartz sand 7 and water are arranged in an inner cavity at the upper part of the sand control filter element 8.
Furthermore, the upper cover 3 of the hyperbaric chamber is also provided with a plurality of measuring column assemblies 6, the measuring column assemblies 6 are hollow pipe fittings, two ends of the measuring column assemblies 6 are respectively communicated with the atmosphere and the inner cavity of the hyperbaric chamber body 5, and the measuring column assemblies 6 are sleeved with the circuit bus 1.
Still further, the column measuring component 6 is a temperature column measuring component, a pressure column measuring component or a temperature-pressure measuring component, and the circuit bus 1 is a temperature circuit bus, a pressure circuit bus or a temperature-pressure circuit bus.
The temperature measuring column component is structurally characterized in that a metal rod is inserted into the inner cavity of the high-pressure cabin body 5, and the temperature of the inner end part of the metal rod is measured. One end of the platinum electrode rod, which is exposed out of the high-voltage cabin body 5, is provided with a cable. The metal rod is fixedly connected with the upper cover 3 of the high-pressure chamber through a sealing joint.
The structure of the pressure measuring column component is a metal pipe, a pressure sensor is arranged at one end of the metal pipe exposed out of the high-pressure cabin body 5, and a cable is arranged on the pressure sensor. The metal sensor is fixedly connected with the upper cover of the high-pressure bin through a sealing joint.
The cable of the temperature sensor and the cable of the pressure sensor are combined into a strand to form a pressure-temperature circuit bus. The bus is finally connected with a signal acquisition cabinet to acquire temperature signals and pressure signals at all positions in the high-pressure cabin 5.
Further, a gas injection main pipe 17 is arranged in the gas injection cavity 9, a plurality of gas injection multi-way branches 18 are uniformly arranged at the upper part of the gas injection main pipe 17, the gas injection main pipe 17 is provided with a gas injection pipe inlet 15, and the gas injection pipe inlet 15 is fixedly connected with the bottom of the high-pressure cabin 5 through a gas injection pipe sealing joint 14;
the gas injection pipe outlet 19 is fixedly connected with the high-pressure cabin upper cover 3 through a gas injection pipe outlet sealing joint 20 and enables the inner cavity of the upper part of the sand control filter element 8 to be communicated with the outside.
The invention discloses a structure for preventing pore ice blockage and blockage removal in the process of hydrate accumulation experiments, which is characterized in that a gas injection main pipe 17 is arranged at the bottom of a high-pressure cabin body 5, the gas injection main pipe 17 is round, a gas injection multi-way branch 18 is arranged on the gas injection main pipe 17, a gas injection pipe inlet 15 and a gas injection pipe outlet 19 are respectively locked and sealed through a gas injection pipe sealing joint 14, quartz sand 7 in the high-pressure cabin body 5 is sand-protected through a sand prevention filter element 8 at the bottom and isolated from a gas injection cavity 9, methane gas is injected into the gas injection cavity 9 through the gas injection pipe inlet 15, the gas enters the gas injection cavity 9 after passing through the gas injection multi-way branch 18, the gas uniformly enters the sand prevention filter element 8 under the split flow of the gas injection pipe multi-way branch 18, the gas enters the quartz sand 7 in the high-pressure cabin body 5 through the sand prevention filter element 8, and the water in the pores of the quartz sand 7 is combined, the invention provides a natural gas hydrate generation method, which is characterized in that a pipeline is often blocked at a gas injection main pipe 17 and a gas injection pipe multi-way branch 18 in the process due to the generation of the hydrate, an annular coil pipe 10 is additionally arranged at the lower side of a sand prevention filter element 8 in a gas injection cavity 9, the inside of the annular coil pipe 10 is filled with heat conducting oil, an annular coil pipe inlet 13 and an annular coil pipe outlet 16 of the annular coil pipe 10 are respectively sealed with a coil pipe sealing joint 14 of which the bottoms of a high-pressure cabin 5 are sealed through an inlet and an outlet, the annular coil pipe 10 is fixed, the sealing between the annular coil pipe 10 and the sealing cavity 9 is realized through a coil pipe sealing joint 12, and in the experimental process, the heat conducting oil is respectively led in and output through an annular coil pipe inlet 13 and an annular coil pipe outlet 16 by peripheral oil bath heating equipment, the inside heating oil bath of coil pipe passes through the access & exit and forms the internal circulation, can remove the pore ice that causes because the hydrate forms the in-process in the experiment through the heating oil bath to can prevent to stop up because the ice that causes in the experimental process cooling, through increasing this circulation coil pipe device, and through effectual temperature control, the jam in pore that causes because solid-state hydrate has been produced when preventing the hydrate equipment experiment that can be good has reduced the various losses of experimental link, improved the efficiency of experiment simultaneously, more effectively avoided stopping up because the experiment that the pore blockked up and cause.
The embodiments of the present invention have been described in detail. However, the present invention is not limited to the above-described embodiments, and various modifications may be made within the knowledge of those skilled in the art without departing from the spirit of the present invention.

Claims (4)

1. The utility model provides a prevent that hydrate from hiding structure of stifled and deblocking of pore ice in experimental process, its characterized in that is equipped with sand control filter core in the well lower part of the inner chamber of high pressure cabin body, forms the gas injection cavity in sand control filter core's lower part, wherein:
An annular coil pipe is arranged in the gas injection cavity, the annular coil pipe is provided with an annular coil pipe inlet and an annular coil pipe outlet, the annular coil pipe inlet and the annular coil pipe outlet are fixedly connected with the bottom of the high-pressure cabin body through annular coil pipe sealing joints, the annular coil pipe inlet is communicated with an outlet of peripheral oil bath heating equipment, the annular coil pipe outlet is communicated with an inlet of the peripheral oil bath heating equipment, and circulating hot oil is filled in the annular coil pipe, wherein:
The annular coil inlet and the annular coil outlet are fixedly connected with the bottom of the high-pressure cabin body in a threaded connection mode through an annular coil sealing joint;
Quartz sand and water are arranged in an inner cavity at the upper part of the sand control filter element;
A gas injection main pipe is arranged in the gas injection cavity, a plurality of gas injection pipe multi-way branches are uniformly arranged at the upper part of the gas injection main pipe, the gas injection main pipe is provided with a gas injection pipe inlet, and the gas injection pipe inlet is fixedly connected with the bottom of the high-pressure cabin body through a gas injection pipe sealing joint;
the outlet of the gas injection pipe is fixedly connected with the upper cover of the high-pressure cabin through a sealing joint of the outlet of the gas injection pipe, and the inner cavity of the upper part of the sand control filter element is communicated with the outside.
2. The structure for preventing ice blockage and removal of pore canal in the process of hydrate reservoir experiments according to claim 1, wherein the top of the high-pressure cabin body is provided with an open cylindrical inner cavity, and the upper cover of the high-pressure cabin is fixedly connected with the top side of the high-pressure cabin body through a locking bolt.
3. The structure for preventing ice blockage and removal of pore canal during hydrate reservoir experiments according to claim 2, wherein a sealing ring is arranged between the upper cover of the high pressure chamber and the top side of the high pressure chamber.
4. The structure for preventing ice blockage and blockage removal of pore canal in the process of hydrate reservoir experiment according to claim 1, wherein a plurality of column measuring components are further arranged on the upper cover of the high-pressure chamber, the column measuring components are hollow pipe fittings, two ends of the column measuring components are respectively communicated with the atmosphere and the inner cavity of the high-pressure chamber body, and a circuit bus is sleeved in the column measuring components.
CN201910072207.2A 2019-01-25 2019-01-25 Structure for preventing pore canal ice blockage and blockage removal in hydrate reservoir experiment process Active CN109538200B (en)

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CN109869138A (en) * 2019-04-01 2019-06-11 北京瑞莱博石油技术有限公司 Pressure-measuring-point ice is stifled during preventing hydrate from hiding simulated experiment and the structure of de-plugging
CN111707801B (en) * 2020-06-30 2022-08-16 中国海洋石油集团有限公司 Device and method for testing generation of natural gas hydrate under simulated flow state
CN112031761B (en) * 2020-09-27 2022-03-11 西南石油大学 Blockage removing device and method for simulating gas well hydrate blockage
CN114542028B (en) * 2020-11-25 2024-08-13 中国石油化工股份有限公司 System, method and coil pipe for extracting crude oil by simulated injection of high-pressure gas
CN114542021B (en) * 2022-01-27 2023-05-23 华南理工大学 Thermochemical method for strengthening CO 2 Replacement mining CH 4 Hydrate device and method
CN115539025B (en) * 2022-08-17 2026-02-03 广州海洋地质调查局 Sand control medium blocking and unblocking evaluation device and method

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