CN115683761A - Degassing device and degassing method - Google Patents
Degassing device and degassing method Download PDFInfo
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- CN115683761A CN115683761A CN202110836651.4A CN202110836651A CN115683761A CN 115683761 A CN115683761 A CN 115683761A CN 202110836651 A CN202110836651 A CN 202110836651A CN 115683761 A CN115683761 A CN 115683761A
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Abstract
The invention relates to the field of oil and gas geochemical exploration, in particular to a degassing device and a degassing method. The degassing device comprises a device body and a piston arranged in the device body, wherein the piston can move up and down along the height direction of the device body, a sealed degassing cavity is arranged between the top of the piston and the inner wall of the device body, a sample inlet pipe and a gas collecting pipe are respectively arranged at the top of the device body, the sample inlet pipe is communicated with the degassing cavity to inject a sample into the degassing cavity for degassing, and the gas collecting pipe is communicated with the degassing cavity to collect and measure gas desorbed from the sample. The degassing device has a compact structure, is simple to operate and convenient to carry, can realize the degassing of a sample and the collection of the desorbed gas by vertically adjusting the position of the piston in the device main body, can immediately extract the desorbed gas for gas chromatography analysis, can also be stored in a closed container for later test, and is suitable for field use in land or on-board ships in sea areas.
Description
Technical Field
The invention relates to the field of oil and gas geochemical exploration, in particular to a degassing device and a degassing method.
Background
Hydrocarbons and other components in the oil and gas reservoir can generate a series of physical and chemical reactions with rocks, soil and water media around a migration channel in a long vertical migration process to leave a 'trace', so that hydrocarbon components dissolved in formation water and surface water are always important targets of interest in oil and gas geochemical exploration, and a detection technology method for hydrocarbons dissolved in water is listed in a national standard 'oil and gas geochemical exploration sample determination method (standard number: GB/T29173-2012'). In recent years, with the vigorous advance of marine oil and gas resource exploration in China, particularly the continuous temperature rise of the exploration technology research of sea natural gas hydrates, the geochemical exploration technology taking hydrocarbons and alteration products thereof as main detection objects is known as one of important marine oil and gas exploration technical means. Since natural gas hydrates are mainly composed of hydrocarbon gases, the concentration of dissolved hydrocarbons in seawater is undoubtedly the first indicator of geochemical exploration of natural gas hydrates.
At present, the method for removing dissolved hydrocarbons from seawater mainly adopts a test method in earth surface oil and gas geochemical exploration, namely a vacuum degassing method in the national standard GB/T29173-2012, and has the following problems: (1) the process is complex, the operation is complicated, and certain experimental operation skills and experience are required; (2) most of the glass test equipment are connected by rubber pipes, and the vacuum degree is reduced and the degassing loss is caused by easy gas leakage; (3) and the number of reagents, materials and auxiliary equipment is large, so that the requirements of field testing are difficult to adapt. In addition, a membrane degassing method based on hollow fiber membrane technology is also commonly applied to water degassing, such as the membrane degassing device described in patent CN110028132A, which is mainly applied to on-line degassing of industrial process water, the required water volume is large, and the biggest defect is that the removed gas is generally pumped away by a vacuum device and is not easy to collect.
Therefore, the seawater degassing device and method which are suitable for shipborne sites and are simple and convenient to operate are invented, so that index information of seawater dissolved hydrocarbon at the investigation position can be obtained in time, and the geochemistry technology is promoted to play a greater role in exploration of oil and gas resources in sea areas, particularly natural gas hydrate resources.
Disclosure of Invention
The present invention provides a degassing apparatus and a degassing method for solving at least one of the above problems.
An aspect of the present invention provides a degassing apparatus including an apparatus body and a piston provided in the apparatus body, wherein the piston is movable up and down in a height direction of the apparatus body, and a sealed degassing chamber is provided between a top of the piston and an inner wall of the apparatus body,
the top of the device main body is respectively provided with a sample inlet pipe and a gas collecting pipe, the sample inlet pipe is communicated with the degassing cavity to inject a sample into the degassing cavity for degassing, and the gas collecting pipe is communicated with the degassing cavity to collect and measure gas removed by the sample.
In one embodiment, the device further comprises an operating rod,
the bottom of the device main body is provided with a threaded hole, the operating rod is connected in the threaded hole in a threaded manner, the upper end of the operating rod is connected with the bottom of the piston,
the operating rod is rotated to drive the piston to move up and down along the height direction of the device main body.
In one embodiment, the bottom of the piston is provided with a bearing, and the upper end of the operating rod is connected to the bottom of the piston through the bearing so that there is no relative rotation between the piston and the device body.
In one embodiment, a detachable sealing cover is arranged on the gas collecting pipe, a sealing gasket is arranged in the sealing cover, and a gas taking port is arranged on the sealing cover.
In one embodiment, a detachable sealing plug is arranged in the sampling tube, and the bottom surface of the sealing plug is flush with the lower end surface of the sampling tube.
In one embodiment, the gas header and the device body are made of transparent materials, the outer wall of the gas header is marked with a first scale mark, and the device body is marked with a second scale mark.
In another aspect of the present invention, a degassing method is further provided, in which the degassing apparatus is used to degas a sample, and the method includes the following steps:
s1: after the piston is adjusted to a first set scale, injecting a sample through the sample inlet pipe until the degassing cavity, the gas collecting pipe and the sample inlet pipe are filled with the sample, and respectively sealing the gas collecting pipe and the sample inlet pipe through the sealing cover and the sealing bolt;
s2: adjusting the piston downwards to a second set scale to degas the sample in a negative pressure environment;
s3: after the degassing is finished, driving the gas removed from the sample into a gas collecting pipe until the internal pressure of the degassing device is balanced with the external pressure;
s4: after recording the volume of the evolved gas, the evolved gas is extracted from the header.
In one embodiment, step S3 comprises the steps of:
an injector with an internal empty is inserted into the air taking opening on the sealing cover, and the position of the piston is adjusted upwards to drive the released air into the air collecting pipe until a push rod of the injector is triggered, so that the internal pressure of the degasser is balanced with the external pressure.
In another embodiment, step S3 comprises the steps of:
the driving liquid is injected through the gas taking port on the sealing cover so as to drive the separated gas into the gas collecting pipe until the internal pressure of the degassing device is balanced with the external pressure, and the driving liquid automatically stops being injected.
In one embodiment, before step S1, the method further includes a step of performing a tightness check on the degassing device:
s01: after the piston is adjusted to the top of the device main body, the gas collecting pipe is sealed, and the sampling pipe is connected with a vacuum gauge;
s02: adjusting the position of the piston downwards until the reading of the vacuum gauge is the set vacuum degree;
s03: the vacuum gauge reading was observed, and if the vacuum gauge reading did not decrease within the set time, the airtightness of the degasser was good.
Compared with the prior art, the invention has the advantages that: the degassing device has the advantages of compact structure, simple operation and portability, and the change of the pressure in the sealed degassing cavity can be realized by vertically adjusting the position of the piston. The piston moves downwards, the volume of the degassing cavity is enlarged, the internal pressure of the degassing cavity is reduced, dissolved gas in the sample is released, after gas-liquid balance is achieved, the piston moves reversely to enable the liquid level in the degassing cavity to rise, the gas removed from the sample is driven into the gas collecting pipe, and the gas is extracted from the gas collecting pipe and can be directly analyzed, detected or stored in a sealed mode. By the degassing device and the degassing method, the composition and concentration indexes of hydrocarbons in the removed gas can be used as important reference basis for natural gas hydrate exploration under the degassing conditions of uniform temperature, pressure and the like.
Drawings
The invention will be described in more detail hereinafter on the basis of embodiments and with reference to the drawings.
FIG. 1 is a schematic view of the structure of a degassing apparatus in the present invention;
FIG. 2 is a flow chart of the degassing method in the present invention.
Reference numerals are as follows:
1-a device body; 2-a piston; 3-a sample inlet pipe; 4-a gas collecting pipe; 5-an operating lever;
6-sealing cover; 7-sealing bolt; 8-degassing chamber; 9-first tick mark; 10-second tick mark;
11-a fixing member; 12-a vent hole; 13-a handle.
Detailed Description
The invention will be further explained with reference to the drawings.
As shown in fig. 1, the present invention provides a degassing apparatus including an apparatus body 1 and a piston 2 provided in the apparatus body 1. The piston 2 can move up and down along the height direction of the device body 1, a sealed degassing cavity 8 is arranged between the top of the piston 2 and the inner wall of the device body 1, a sample inlet pipe 3 and a gas collecting pipe 4 are respectively arranged at the top of the device body 1, the sample inlet pipe 3 is communicated with the degassing cavity 8 so as to inject a sample into the degassing cavity 8 for degassing, and the gas collecting pipe 4 is communicated with the degassing cavity 8 so as to collect and measure gas desorbed from the sample.
The degassing device has the advantages of compact structure, simple operation and portability, and the pressure in the sealed degassing cavity 8 can be changed by vertically adjusting the position of the piston 2. Wherein, the piston 2 moves downwards, the volume of the degassing cavity 8 is enlarged, the internal pressure is reduced, the gas dissolved in the sample is released, after the gas-liquid balance is achieved, the piston 2 moves reversely to raise the liquid level in the degassing cavity 8, the gas removed from the sample is driven to the gas collecting pipe 4, and the gas is extracted from the gas collecting pipe 4 to be directly analyzed and detected or hermetically stored.
In addition, the gas which is removed can be immediately analyzed by gas chromatography after being extracted to obtain the composition and the concentration of the dissolved hydrocarbon, and the dissolved hydrocarbon can also be stored in a closed container for later test, so that the method is suitable for field use in land or sea areas on board.
By the degassing device and the degassing method, the composition and concentration indexes of hydrocarbons in the removed gas can be used as important reference basis for natural gas hydrate exploration under the degassing conditions of uniform temperature, pressure and the like.
The sample in the present invention is a liquid sample, such as seawater.
Example one
In this embodiment, the degassing device further comprises an operating lever 5. The bottom of the device body 1 is provided with a threaded hole, the operation rod 5 is screwed in the threaded hole, and the upper end of the operation rod 5 is connected with the bottom of the piston 2. Wherein, the piston 2 can be driven to move up and down along the height direction of the device main body 1 by rotating the operating rod 5.
In this embodiment, the piston 2 is connected with the inner wall of the device body 1 in a sliding and sealing manner, the piston 2 is driven by the operating rod 5 to move up and down to a set scale, and the power for moving the operating rod 5 up or down is provided by the operating rod 5 when the threaded hole at the bottom of the device body 1 rotates.
Preferably, the bottom of the piston 2 is provided with a bearing, and the upper end of the operation rod 5 is connected to the bottom of the piston 2 through the bearing so that there is no relative rotation between the piston 2 and the device body 1. So that the piston 2 does not rotate but moves only up and down when the operating rod 5 rotates.
Specifically, the device body 1 is a cylindrical body with an open lower end, and the lower end thereof is provided with a fixing member 11, and the center of the fixing member 11 is provided with the above-mentioned threaded hole for mounting the operation rod 5. Further, an outer peripheral wall of the fixing member 11 is provided with an external thread, and a lower end of the apparatus body 1 is provided with an internal thread, so that the fixing member 11 is screwed into the lower end of the apparatus body 1. In addition, in order to prevent the pressure influence caused by the sealing, a vent hole 12 may be provided in the fixing member 11 to ensure pressure balance.
Specifically, the lower end of the operation rod 5 is provided with a handle 13 or a hand-cranking grip to facilitate driving the operation rod 5 to rotate.
Example two
The description of the present embodiment is different from the above embodiments, and the description of the same parts is omitted.
In this embodiment, the main body 1 is cylindrical, and two branch pipes, which are a sampling pipe 3 and a gas collecting pipe 4, are provided at the upper end thereof, and a sealing plug 7 and a sealing cap 6 are provided, respectively.
Wherein, be provided with detachable sealed lid 6 on the discharge 4, be provided with sealed the pad in the sealed lid 6, be provided with the gas taking port on the sealed lid 6. Through the sealed pad of inside lining to the realization is sealed to the orificial of gas collecting pipe 4, through setting up the gas port, with the collection drives to the gas in the gas collecting pipe 4. Specifically, the sealing gasket is a rubber gasket, and the sealing cover 6 is in threaded connection with the pipe opening of the gas collecting pipe 4.
The sampling tube 3 is provided with a detachable sealing plug 7, and the bottom surface of the sealing plug 7 is flush with the lower end surface of the sampling tube 3. In other words, the sealing plug 7 may fill the inside of the sampling tube 3 and seal with the inner wall of the sampling tube 3 to block the gas escaping from the sample from entering the sampling tube 3. Specifically, the sealing plug 7 is screwed into the sampling tube 3.
EXAMPLE III
The description of the present embodiment is different from the above embodiments, and the description of the same parts is omitted.
In this embodiment, the gas collecting tube 4 and the device body 1 are both made of transparent materials, the outer wall of the gas collecting tube 4 is marked with a first scale mark 9, and the device body 1 is marked with a second scale mark 10.
Wherein, the gas collecting pipe 4 is made of transparent material and marked with a first scale mark 9 which can be used for measuring the volume of the removed gas. The device body 1 is made of transparent material and marked with second graduation lines 10, so that on the basis of the test, the sample volume and the negative pressure vacuum degree can be adjusted to obtain the most satisfactory degassing effect.
Preferably, the gas collecting pipe 4 and the device body 1 are made of colorless transparent materials, such as glass, plastic, etc. Therefore, the whole device has no metal device, and cannot cause seawater corrosion.
The sampling tube 3 may be made of a transparent material. In addition, the device body 1, the gas collecting tube 4, and the sampling tube 3 may be integrally formed at the time of manufacture.
As shown in fig. 2, the present invention provides a degassing method for degassing a sample by using the above degassing apparatus, comprising the steps of:
s1: after the piston 2 is adjusted to a first set scale, injecting a sample through the sample inlet pipe 3 until the degassing cavity 8, the gas collecting pipe 4 and the sample inlet pipe 3 are filled with the sample, and respectively sealing the gas collecting pipe 4 and the sample inlet pipe 3 through the sealing cover 6 and the sealing bolt 7;
s2: adjusting the piston 2 downwards to a second set scale to degas the sample in a negative pressure environment;
s3: after the degassing is finished, driving the gas removed from the sample into a gas collecting pipe 4 until the internal pressure of the degassing device is balanced with the external pressure;
s4: after recording the volume of the evolved gas, the evolved gas is extracted from the header 4.
In the degassing method of the present invention, the pressure in the sealed degassing chamber 8 can be changed by adjusting the position of the piston 2 up and down. Wherein, the piston 2 moves downwards, the volume of the degassing cavity 8 is enlarged, the internal pressure is reduced, so that the dissolved gas in the sample is released, after the gas-liquid equilibrium is reached, the piston 2 moves reversely to make the liquid level in the degassing cavity 8 rise, the gas removed from the sample is driven to the gas collecting pipe 4, and the gas is extracted from the gas collecting pipe 4 to be directly analyzed, detected or sealed and stored.
The gas after being extracted can be immediately analyzed by gas chromatography to obtain the composition and concentration of the dissolved hydrocarbon, and the dissolved hydrocarbon can also be stored in a closed container for later test, so that the method is suitable for field use in land or sea areas.
Under the degassing conditions of uniform temperature, pressure and the like, the hydrocarbon composition and concentration indexes in the desorbed gas can be used as important reference bases for natural gas hydrate exploration.
Preferably, because the whole device is compact, when degassing the sample in step S2, the whole degassing device can be placed in a water bath for constant temperature heating, so as to improve the degassing speed and the degassing efficiency.
Example four
After degassing is finished, two modes can be adopted to collect the degassed gas. Step 3 will be specifically described below.
In one embodiment, step S3 comprises the steps of: an injector with an internal empty is inserted into an air taking port on the sealing cover 6, and the position of the piston 2 is adjusted upwards to drive the released air into the gas collecting pipe 4 until a push rod of the injector is triggered, so that the internal pressure of the degasser is balanced with the external pressure.
Specifically, after the internal evacuation syringe is inserted into the gas taking port of the sealing cover 6, the piston 2 is driven to move upwards by rotating the handle 13, the liquid level in the degassing cavity 8 rises, the separated gas is driven into the gas collecting pipe 4, the pressure rises until the push rod of the syringe is touched, the internal pressure of the degassing device is balanced with the outside, and the handle 13 stops rotating.
In another embodiment, step S3 comprises the steps of: the driving liquid is injected through the gas taking port on the sealing cover 6 to drive the removed gas into the gas collecting pipe 4 until the internal pressure of the degassing device is balanced with the external pressure.
Specifically, saturated saline may be employed as the driving liquid. Wherein, saturated salt water holds in the container, adopts the mode that rubber tube front end connects the syringe needle and carries. After degassing, the needle head is inserted into the gas taking port, saturated saline is automatically injected, the liquid level in the degassing cavity 8 rises along with the injection of the saturated saline, the degassed gas is driven into the gas collecting pipe 4, after the internal pressure of the degassing device is balanced with the external pressure, the injection of the saturated saline is automatically stopped, the volume of the gas is recorded, and the transfer gas is extracted by the injector.
EXAMPLE five
The description of the present embodiment is different from the above embodiments, and the description of the same parts is omitted.
Before step S1, a step of checking the tightness of the degassing device is further included:
s01: after the piston 2 is adjusted to the top of the device main body 1, the air collecting port is sealed, and a vacuum gauge is connected to the sample inlet;
s02: the position of the piston 2 is adjusted downwards until the reading of the vacuum gauge is the set vacuum degree;
s03: the vacuum gauge reading was observed, and if the vacuum gauge reading did not decrease within the set time, the airtightness of the degasser was good.
In this embodiment, when the degassing device is subjected to a sealing inspection, an additional vacuum-pumping device is not required to evacuate the degassing device, the piston 2 is adjusted to the top of the device body 1, and then all the gas in the degassing chamber 8 can be exhausted, and after the degassing chamber is sealed, the piston 2 is adjusted downward, so that the degassing chamber 8 can be in a negative pressure state with a set vacuum degree, and the operation is simple and convenient.
EXAMPLE six
The procedure of the in-situ degassing treatment of dissolved hydrocarbons in seawater will be described in detail below.
Firstly, all parts are cleaned, dried at room temperature and then assembled for standby.
And secondly, placing the piston 2 at the uppermost end, screwing the sealing cover 6 to seal the gas collecting pipe 4, and connecting a vacuum gauge at the sampling pipe 3.
And thirdly, rotating the operating rod 5 to enable the piston 2 to descend until the reading of the vacuum gauge is close to-0.1 MPa, and keeping for 1h, wherein if the reading of the vacuum gauge is not reduced in the period, the sealing performance of the degassing device is good, and the inspection is finished.
And fourthly, opening the sampling pipe 3 and the gas collecting pipe 4, enabling the piston 2 to descend to a set scale, and adding a water sample until the sampling pipe 3 and the gas collecting pipe 4 are filled.
Fifthly, the sealing bolt 7 is screwed into the sampling tube 3, then the sealing cover 6 of the gas collecting tube 4 is covered, and no air bubbles are kept inside.
And sixthly, rotating the operating rod 5 to enable the piston 2 to descend to another set scale, and starting degassing (if necessary, placing the degassing device in a water bath heating at about 60 ℃ to accelerate degassing speed and efficiency).
And seventhly, after the operation is kept for 30min, rotating the operating rod 5 in the opposite direction to enable the piston 2 to ascend until the internal pressure and the external pressure are balanced, and driving the desorbed gas into the gas collecting pipe 4 along with the ascending of the piston 2 and the rising of the liquid level in the degassing cavity 8.
Eighthly, reading and recording the volume of the gas in the gas collecting pipe 4, and extracting part of the gas to directly perform gas chromatography; the rest gas can be pumped out and stored in a sealed way for standby application as required.
While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (10)
1. A degassing device comprising a device body and a piston provided in the device body,
wherein the piston can move up and down along the height direction of the device body, a sealed degassing cavity is arranged between the top of the piston and the inner wall of the device body,
the top of the device main body is respectively provided with a sample inlet pipe and a gas collecting pipe, the sample inlet pipe is communicated with the degassing cavity to inject a sample into the degassing cavity for degassing, and the gas collecting pipe is communicated with the degassing cavity to collect and measure gas removed by the sample.
2. The degassing device according to claim 1, further comprising an operating lever,
the bottom of the device main body is provided with a threaded hole, the operating rod is in threaded connection with the threaded hole, the upper end of the operating rod is connected with the bottom of the piston,
the operating rod is rotated to drive the piston to move up and down along the height direction of the device main body.
3. A degassing apparatus according to claim 2 in which the bottom of the piston is provided with a bearing through which the upper end of the operating rod is connected to the bottom of the piston so that there is no relative rotation between the piston and the apparatus body.
4. A degassing device as claimed in any one of claims 1 to 3 wherein the manifold is provided with a removable sealing cover, a sealing gasket being provided in the sealing cover, and a gas extraction port being provided in the sealing cover.
5. A degassing device according to any one of claims 1 to 3 wherein a removable sealing plug is provided within the sample tube and has a bottom surface which is flush with the lower end surface of the sample tube.
6. A degassing device as claimed in any one of claims 1 to 3 in which the manifold and the device body are both formed from transparent material and the outer wall of the manifold is marked with a first scale and the device body is marked with a second scale.
7. A method of degassing a sample using the degassing device according to any one of claims 1 to 6, comprising the steps of:
s1: after the piston is adjusted to the first set scale, injecting a sample through the sample inlet pipe until the degassing cavity, the gas collecting pipe and the sample inlet pipe are filled with the sample, and respectively sealing the gas collecting pipe and the sample inlet pipe through the sealing cover and the sealing bolt;
s2: adjusting the piston downwards to a second set scale to degas the sample in a negative pressure environment;
s3: after the degassing is finished, driving the gas removed from the sample into a gas collecting pipe until the internal pressure of the degassing device is balanced with the external pressure;
s4: after recording the volume of evolved gas, the evolved gas was withdrawn from the manifold.
8. A degassing method according to claim 7, characterized in that step S3 comprises the following steps:
an injector with an internal empty is inserted into the air taking opening on the sealing cover, and the position of the piston is adjusted upwards to drive the released air into the air collecting pipe until a push rod of the injector is triggered, so that the internal pressure of the degasser is balanced with the external pressure.
9. A degassing method according to claim 7, characterized in that step S3 comprises the following steps:
the driving liquid is injected through the gas taking port on the sealing cover so as to drive the separated gas into the gas collecting pipe until the internal pressure of the degassing device is balanced with the external pressure, and the driving liquid automatically stops being injected.
10. A degassing method according to any one of claims 7 to 9, further comprising, before step S1, a step of checking the tightness of the degassing device:
s01: after the piston is adjusted to the top of the device main body, the gas collecting pipe is sealed, and the sample inlet pipe is connected with a vacuum gauge;
s02: adjusting the position of the piston downwards until the reading of the vacuum gauge is the set vacuum degree;
s03: the vacuum gauge reading was observed, and if the vacuum gauge reading did not decrease within the set time, the airtightness of the degasser was good.
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| CN202110836651.4A CN115683761A (en) | 2021-07-23 | 2021-07-23 | Degassing device and degassing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116550014A (en) * | 2023-07-10 | 2023-08-08 | 广东电网有限责任公司佛山供电局 | Oil-gas separation device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116550014A (en) * | 2023-07-10 | 2023-08-08 | 广东电网有限责任公司佛山供电局 | Oil-gas separation device |
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