CN103233729A - Vacuum extraction method for rock core gas in natural gas hydrate drilling field - Google Patents
Vacuum extraction method for rock core gas in natural gas hydrate drilling field Download PDFInfo
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- CN103233729A CN103233729A CN2013101490732A CN201310149073A CN103233729A CN 103233729 A CN103233729 A CN 103233729A CN 2013101490732 A CN2013101490732 A CN 2013101490732A CN 201310149073 A CN201310149073 A CN 201310149073A CN 103233729 A CN103233729 A CN 103233729A
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Abstract
The invention provides a vacuum extraction method for rock core gas in a natural gas hydrate drilling field and belongs to the field of natural gas hydrate exploration. The vacuum extraction method is achieved through a special rock core gas vacuum extraction system. The system comprises a vacuumizing unit, a gas collecting tank, a gas extracting unit and a degassing environmental chamber. The vacuum extraction method comprises the following steps of cleaning rock core samples acquired in the drilling field and placing the samples in the gas collecting tank, discharging air in the gas collecting tank and enabling the inside of the gas collecting tank to be isolated from outside air; utilizing the vacuumizing unit to form vacuum negative pressure in the gas collecting tank; placing the gas collecting tank with formed vacuum negative pressure into the degassing environmental chamber and enabling the rock core samples in the gas collecting tank to perform degassing in a time period under the specific temperature condition; and using the gas extracting unit to extract gas in the gas collecting tank. The vacuum extraction method adopts vacuum constant-temperature degassing, is high in degassing degree and stable in degassing environment, improves the gas collecting efficiency and ensures the extracting quality of gas samples.
Description
Technical field
The present invention relates to the gas extraction field, relate to the vacuum extraction method that a kind of gas hydrates are drilled on-the-spot rock core gas more specifically.
Background technology
Gas hydrates are a kind of high density (1 m
3Can discharge 164 m
3Methane) clean energy resource, be 2 times of conventional energy resource resource summations such as global coal, oil, natural gas, caused showing great attention to of global many countries.In the drilling process, rock core discharges the size of gas flow, is that one of key parameter whether hydrate exists is judged at the scene fast.Therefore, the high efficiency extraction of hydrate situ of drilling well rock core gas is the collection of probing gas on-site, measurement and then declares the important foundation of knowing hydrate fast.
Through literature search, at present domestic and international gas hydrates drilling well rock core gas collecting extracting method mainly contains the static headspace gas method and leaves standstill degassing method.The former is mainly used in gathering the gas in the rock core (or landwaste), and the latter then is used for gathering the gas of hydrate rock core, and concrete grammar is as follows:
1, static headspace gas method, concrete operations are: the core sample that 5cm is long is weighed and is packed into and be furnished with in the metal can of dottle pin, adding water makes between metal can and the sample and is full of water, certain locus (100ml) is left on top, the bactericide (sodium azide) that adds 2.3g in the water, then sample and water-stop are got up, be inverted refrigeration and transportation, after delivering to the laboratory, the sample temperature of refrigeration is returned to 20 ℃, carry out 5 minutes high speed machine vibration again, get a certain amount of container top space gas (15ml) then and carry out hydrocarbon composition and isotope analysis.This method adopts normal temperature mechanical oscillation mode to discharge gas, and advantage is: field operation is simple, quick; Shortcoming is: (1) along with decomposition and the gas of hydrate discharge, the pressure in the metal can is increasing, has suppressed the decomposition of hydrate, causes gas to discharge not exclusively; (2) decompose the air that the hydrocarbon gas that discharges has been sneaked into metal can top headspace, cause a series of analytical errors.
2, leave standstill drainage, concrete operations are: select the higher and macroscopic hydrate core sample of content, it is immersed under water, the gas that decomposition of hydrate discharges, with the displacement water law gas that discharges is collected in the available bottle stopper sealed glass container, or temporarily be collected in the plastic injector of 60ml, import in the special-purpose vial then and seal up for safekeeping.This method adopts under the normal temperature and leaves standstill release naturally, and gas is got in draining, and advantage is that field operation is simple, has got rid of air influence; Shortcoming is: it is slower that (1) leaves standstill the nature rate of release; (2) sample decompose to discharge influenced by environmental temperaturely, makes the decomposition of hydrate degree varies, and gas burst size error is bigger.
In sum, the above two kinds of methods that exist in the prior art all have the simple advantage of field operation, but have all also that decomposition rate is slow, efficient is low, incomplete, and easy shortcoming such as influenced by ambient temperature, but also may be subjected to the influence that air is sneaked into pollution.
Summary of the invention
The objective of the invention is to overcome and get the shortcoming that gas is insufficient, gas componant that take out is subject to air or ambient temperature effect in the above-mentioned prior art, propose a kind of gas hydrates and drill the vacuum extraction method of hydrocarbon gas in the on-the-spot rock core, to improve efficient and the precision of test result of hydrate probe boring core sample gas collecting.
The concrete technical scheme of the present invention is as follows:
A kind of gas hydrates are drilled the vacuum extraction method of on-the-spot rock core gas, described vacuum extraction method is to drill on-the-spot rock core gas vacuum extraction system by the gas hydrates of special use to realize, described vacuum extraction system comprises vacuum unit A, air collector B, unit C and degassing environmental chamber D bleed, described air collector B comprises tank body 1 and Cap for tin body 4, be formed with main aperture and secondary hole on the described Cap for tin body 4, the secondary hole pipe 5 that has valve switch 6 is installed on the described secondary hole, the described unit C that bleeds is set on the described main aperture, described main aperture is communicated with described aspirating chamber of bleeding unit C, and described vacuum extraction method may further comprise the steps:
Step 1, the core sample that will drill collection in worksite clean and to be placed among the air collector B, discharge air collector B
Interior air also makes its inside and isolate from outer air;
Step 2, utilize vacuum unit A in described air collector B, to form negative pressure of vacuum;
Step 3, the air collector B that will form negative pressure of vacuum put into degassing environmental chamber D, and core sample was wherein outgased in temperature condition and the time period set;
Further according to vacuum extraction method of the present invention, wherein said step 1 can further may further comprise the steps:
1), the core sample that will drill collection in worksite cleans and to be placed in the tank body 1 of air collector, open the valve switch 6 on the Cap for tin body 4 secondary hole pipes 5, and under the saturated brine environment described Cap for tin body 4 is being sealedly connected on the described tank body 1, utilize the air in the saturated brine discharge air collector;
2), close Cap for tin body 4 secondary holes and manage the valve switch 6 on 5 so that air collector is inner isolated fully with outside air.
Further according to vacuum extraction method of the present invention, wherein said tank body 1 is the core structure of an end opening, end sealing, openend is used for putting into core sample, and the openend outer wall is provided with external screw thread, and the outer wall groove in the external screw thread lower end is equipped with first sealing ring 2; The complete opening of one end of described Cap for tin body 4, the other end is provided with described secondary hole and main aperture, the openend inwall of described Cap for tin body 4 is provided with internal thread, described internal thread top forms round table-like inner chamber, the top of round table-like inner chamber is as described main aperture, between described internal thread top and round table-like inner chamber, be formed with a transition platform, described transition platform is provided with second sealing ring 3, described secondary hole pipe 5 is provided with described valve switch 6 in the Cap for tin body outside, when described Cap for tin body 4 was tightened on the described tank body 1, Cap for tin body 4 openend inwalls pushed first sealing ring 2, thereby tank body 1 openend ora terminalis pushes second sealing ring 3 and forms the air collector of sealing fully.
Further according to vacuum extraction method of the present invention, wherein said vacuum unit A comprises manufacturing glass tube with vacuum 16, vacuum pump 19 and is connected flexible pipe 22,23, described manufacturing glass tube with vacuum 16 comprises a straight pipe and a side siphunculus, straight pipe valve 17 is housed on the described straight pipe, side siphunculus valve 18 is housed on the described side siphunculus, and described step 2 further may further comprise the steps:
1), close the straight pipe valve of making on the glass tube with vacuum 16 17, connection flexible pipe 23 1 ends of discharging air are connected on the secondary hole pipe 5, the other end is connected on the straight pipe of making glass tube with vacuum 16;
2), another end that connects flexible pipe 22 is connected on the side siphunculus of making glass tube with vacuum 16, the other end is connected on the aspirating hole of vacuum pump 19;
3), open side siphunculus valve 18, start vacuum pump 19, form stable negative pressure of vacuum in the glass tube with vacuum 16 to be manufactured after, successively close side siphunculus valve 18 and vacuum pump 19;
4), successively open the straight pipe valve 17 that the secondary hole of Cap for tin body is managed the valve switch 6 on 5 and made glass tube with vacuum 16, treat that saturated brine in the air collector flows in the manufacturing glass tube with vacuum 16 and when reaching pressure balance under the negative pressure of vacuum effect, close the valve switch 6 on the secondary hole of the Cap for tin body pipe 5, namely in air collector B, form negative pressure of vacuum.
Further according to vacuum extraction method of the present invention, wherein said degassing environmental chamber D is a constant temperature water bath case 12, described constant temperature water bath case 12 comprises: temperature control panel 13, tank 14 and tank body draw-in groove 15, described tank body draw-in groove 15 is arranged in the described tank 14, and described step 3 may further comprise the steps:
1), the air collector that will hold core sample and form negative pressure of vacuum is put into the tank body draw-in groove 15 of constant temperature water bath case 12, and is made the water flooding air collector in the tank 14;
2), by the water temperature in the temperature control panel 13 control tanks, set degassing temperature as the case may be, the core sample in the air collector can the degassing voluntarily under constant temperature, namely finishes the degasification process of core sample after reaching certain degassing time.
Further according to vacuum extraction method of the present invention, the wherein said unit C that bleeds comprises the platform 7 of bleeding, band aspirating hole screw rod 8 and seal gasket 9, the described platform 7 of bleeding be two stacked cylindrical and be arranged at directly over the described main aperture, the described inside of cylinder down is formed with the aspirating chamber of spherical crown shape, the bottom of described aspirating chamber and described main aperture UNICOM, described inside of going up cylinder is formed with interior cylindrical cavity, the extract opening at described aspirating chamber top is communicated with described interior cylindrical cavity, described seal gasket 9 is positioned in cylinder described at the bottom of the cylindrical cavity chamber and the low described extract opening that is connected to down cylinder downwards, described band aspirating hole screw rod 8 is arranged at described interior and downward the hanging down of interior cylindrical cavity of going up cylinder and is connected to described seal gasket 9, and described step 4 further may further comprise the steps:
1), the end that will discharge the connection flexible pipe of air is connected on the secondary Kong Guanlian 5 on the air collector Cap for tin body of finishing the degassing, the other end is positioned in the water tank in the water body;
2), the pin of bleeding that a small amount of saturated brine will be housed is by the aspirating hole 11 on the band aspirating hole screw rod 8, slowly the puncture through seal rubber cushion 9, enter in the spherical crown shape aspirating chamber;
3), open the valve switch 6 on the pipe of the secondary hole of Cap for tin body so that be in atmospheric pressure state in the air collector, the beginning extracting gases, bleed finish after, the gas that will extract out injects to be inverted in the underwater gas bottle and sealing.
Further according to vacuum extraction method of the present invention, wherein said band aspirating hole screw rod 8 profiles are that lower cylindrical shape, top round pie, center are provided with the aspirating hole 11 that two ends connect, the lower cylindrical outer wall has external screw thread, the interior cylindrical cavity inwall of the last cylinder of the described platform 7 of bleeding is formed with internal thread, and the two formation is threaded.Described band aspirating hole screw rod 8 top cake end faces are provided with an in-line groove 10 of crossing the center, at the air collector (B) that Cap for tin body (4) is tightened against tank body (1) is gone up and forms sealing before, band aspirating hole screw rod 8 is tightened against in the last cylinder of the platform of bleeding by in-line groove 10 by a word screwdriver, and make band aspirating hole screw rod 8 lower ends be squeezed in described seal gasket 9, guarantee that the gas in the air collector can not leak from the extract opening at aspirating chamber top.
A kind of knowledge method of declaring of gas hydrates may further comprise the steps: step 1, at probing collection in worksite core sample, and extract the gas that this core sample discharges according to above-mentioned vacuum extraction method; The size of step 2, the gas flow that extracts according to step 1 also judges to drill in the on-the-spot rock core whether have gas hydrates in conjunction with other features of core sample itself.
The vacuum extraction method of drilling on-the-spot rock core gas by gas hydrates of the present invention can reach following technique effect at least:
1), utilize the negative pressure of vacuum in the air collector, not only accelerate the gas rate of release of gas hydrates test core, improved gas collecting efficient; And got rid of the influence that air is sneaked into, guaranteed to gather the quality of gaseous sample;
2), the particular design of Cap for tin body inner chamber, guaranteed that gas that the hydrate probe boring rock core discharges collects in the spherical crown shape aspirating chamber of the tank body caping under the aspirating hole, this not only is beneficial to the effective extracting gases of the pin of bleeding, and also can come out gas extraction to greatest extent;
3), the use of constant temperature water bath case, accelerated not only that rock core discharges the speed of gas in the air collector, and kept the constancy of air collector internal temperature, got rid of the influence of variation of ambient temperature, improved the comparativity of rock core collection capacity.
Description of drawings
Accompanying drawing 1 is drilled the modular construction schematic diagram of the used vacuum air-taking system of vacuum extraction method of on-the-spot rock core gas for realizing gas hydrates of the present invention;
Accompanying drawing 2 is the structure for amplifying schematic diagram of the unit of bleeding in the vacuum air-taking system shown in the accompanying drawing 1;
Accompanying drawing 3 is drilled the structural representation that forms the negative pressure of vacuum process in the vacuum extraction method of on-the-spot rock core gas for gas hydrates of the present invention;
The implication of each Reference numeral is as follows among the figure:
The 1-tank body, 2-tank body sealing ring, 3-Cap for tin body sealing ring, the 4-Cap for tin body, the secondary hole of 5-pipe, the 6-valve switch, the 7-platform of bleeding, 8-band aspirating hole screw rod, the 9-seal gasket, 10-in-line groove, the 11-aspirating hole, 12-constant temperature water bath case, 13-temperature control panel, the 14-tank, 15-tank body draw-in groove, 16-makes glass tube with vacuum, 17-straight pipe valve, 18-side siphunculus valve, the 19-vacuum pump, the 20-gauge tap, 21-barometer scale, 22-23-connects flexible pipe, the 24-plastic cistern, the A-vacuum unit, the B-air collector, the C-unit of bleeding, the D-environmental chamber that outgases.
The specific embodiment
The vacuum extraction method of gas hydrates of the present invention being drilled on-the-spot rock core gas below in conjunction with accompanying drawing is described in detail, but does not therefore limit the application's protection domain.
Used vacuum air-taking system is described in detail when at first gas hydrates of the present invention being drilled on-the-spot rock core gas and extract, the vacuum air-taking system that gas vacuum extraction method of the present invention is based on this innovative design carries out, not only can discharge gas to rock core fast based on this system extracts, and collected rock core gas is very near the actual gas flow that can discharge of rock core, and effectively got rid of the influence of entrained air, based on this whether gas hydrates are existed and can judge more accurately.
As shown in Figure 1, the gas hydrates of the present invention overall constituent components of vacuum air-taking system of drilling on-the-spot rock core gas comprises: vacuum unit A, air collector B, unit C and degassing environmental chamber D bleed.
Wherein vacuum unit A comprises manufacturing glass tube with vacuum 16, vacuum pump 19, connects flexible pipe 22-23 and plastic cistern 24, make glass tube with vacuum 16 and comprise a straight pipe and a side siphunculus, straight pipe connects among flexible pipe 23 and the air collector B the secondary hole on the Cap for tin body 4 by rubber and manages 5 and be connected, and at straight pipe straight pipe valve 17 is installed, is used for the opening and closing of control straight pipe; The side siphunculus is connected with vacuum pump 19 by rubber hose 22, side siphunculus valve 18 is housed on it, be used for UNICOM and the shutoff of control and vacuum pump 19, also be provided with gauge tap 20 and air pressure gauge table 21 on the described vacuum pump 19, gauge tap 20 is used for opening and closing vacuum pump and controls the time of taking out vacuum processed, barometer scale 21 shows the pressure of making after vacuumizing in the glass tube with vacuum 16, and plastic cistern 24 is used for air and discharges (accompanying drawing 3).
Wherein air collector B comprises tank body 1 and Cap for tin body 4, and described tank body 1 is the stainless steel core structure of an end opening, and openend is used for putting into core sample; The openend outer wall has external screw thread, is used for closely being connected with the internal thread of Cap for tin body 4 openends; Groove in tank body 1 outer wall external screw thread lower end is equipped with elastomeric tank body sealing ring 2, is used for the auxiliary seal between tank body 1 outer wall and Cap for tin body 4 inwalls.Described Cap for tin body 4 is that the complete opening of an end, the other end then are the detachable stainless steel device that has the perforate end of a secondary hole and a main aperture, the openend of described Cap for tin body 4 is the pipe shape, have internal thread on the inwall, by rotation, the tapped inwall of Cap for tin body 4 openends can closely be connected with the externally threaded outer wall of tank body 1 openend band, and is connecting maximum by the 2 formation sealings of tank body sealing ring.Part on the described Cap for tin body 4 openend pipes is Cap for tin body 4 perforate ends, the inner chamber of described perforate end is round table-like inclined-plane, smooth surface, being beneficial to gas that rock core in the tank body 1 discharges converges to the unit C that bleeds at top, the top transition of round table-like inner chamber be the about 5mm(of diameter bleed bleed in the unit under the platform 7) about, and seamlessly transit with the spherical crown shape aspirating chamber in the platform of bleeding, spherical crown shape aspirating chamber is the final habitat that compiles gas through round table-like inner chamber, also is the aspirating chamber of inserting needle sampling.Between the tapped top of Cap for tin body 4 openends and round table-like inner chamber, a transition platform is arranged, be used for to place rubber seal 3, when Cap for tin body 4 is connected when tightening tank body 1 perforate end port with tank body 1, namely the rubber seal 3 with Cap for tin body 4 forms sealing, and completely cuts off inside and outside making air collector.The main aperture of the perforate end of Cap for tin body 4 is the top (the about 5mm of diameter) of round table-like inner chamber, upwards even transition is connected in the spherical crown shape aspirating chamber of the unit C that bleeds, the side of Cap for tin body 4 main apertures has secondary hole, secondary hole pipe 5 is the stainless steel tube inside and outside Cap for tin body 4 is run through in secondary hole, have valve switch 6 on the secondary hole pipe 5 in Cap for tin body 4 outsides, Cap for tin body 4 inboards, the stainless steel tube length of secondary hole pipe 5, should be greater than the pipe height of Cap for tin body 4 openends, so that Cap for tin body 4 be connected with tank body 1 sealing after, during the upright extracting gases of air collector B, the mouth of pipe of Cap for tin body 4 inboard secondary holes pipes 5 extend into below the tank level all the time.Secondary hole, Cap for tin body 4 outsides pipe 5 connects flexible pipe 23 by rubber and links to each other with the straight pipe of making glass tube with vacuum 16 bottoms, and the valve switch 6 on the secondary hole pipe 5 is used for being communicated with of the control external world and air collector B inside.
The unit C that wherein bleeds comprises the platform 7 of bleeding, band aspirating hole screw rod 8 and seal gasket 9.Be provided with the platform 7 of bleeding directly over the main aperture on the top of described Cap for tin body 4 round table-like inner chambers, described platform 7 outward appearances of bleeding be two stacked cylindrical, following cylindrical inside is formed with spherical crown shape aspirating chamber, the aspirating chamber bottom seamlessly transits with the round table-like interior top of chamber (main aperture) of Cap for tin body and is communicated with, the aspirating chamber top is communicated in the tapped interior cylindrical cavity of cylinder, and the cylindrical cavity internal diameter greater than spherical crown shape aspirating chamber top exit internal diameter to place seal gasket 9, structure for amplifying as shown in Figure 2, described seal gasket 9 is positioned at the bottom of the interior cylindrical cavity chamber of cylinder, and the low spherical crown shape aspirating chamber outlet that is connected to down cylinder downwards, band aspirating hole screw rod 8 is screwed in the cylindrical cavity of last cylinder, and low being connected to seals special seal gum pad 9 downwards.Band aspirating hole screw rod 8 profiles are the lower cylindrical shape, the top round pie.Lower cylindrical outer wall belt screw thread forms tight the connection with screw thread on the cylindrical cavity inwall of cylinder on the platform of bleeding.Band aspirating hole screw rod 8 top cake end faces are provided with an in-line groove 10 of crossing the center, be used for screwing band aspirating hole screw rod 8, when tightening band aspirating hole screw rod 8, its lower end roof pressure special seal gum pad 9 and make spherical crown shape aspirating chamber in the platform 7 of bleeding with outside isolated, so with air collector B with outside isolated.The center of band aspirating hole screw rod 8 is the aspirating hole 11 that two ends connect, and the upper end is positioned at the centre of in-line groove 10, the lower end spherical crown shape aspirating chamber in the platform of bleeding over against the Cap for tin body top.Special seal gum pad 9 places the last cylindrical cavity bottom of the platform 7 of bleeding, and can sealed shell of tank builds the spherical crown shape aspirating chamber at 4 tops, the pin inserting needle that also can be used for bleeding, extract by.In the preferred technical solution of the present invention, described unit C and the described Cap for tin body 4 of bleeding is integrally formed, the platform of bleeding of the integrally formed unit of bleeding namely makes progress in Cap for tin body 4 end face main aperture positions, that is the platform 7 of bleeding can be structure as a whole to guarantee that the sealing of round platform inner chamber and spherical crown shape aspirating chamber is communicated with Cap for tin body 4, and two included stacked cylinders of the platform of bleeding certainly also can be integrally formed with the assurance tightness.In this preferred embodiment, described bleed unit and the air collector unification that is in integrative-structure can be defined as and get the gas unit, the described unit C that bleeds is as the delivery outlet part of air collector B, but the present invention is not as limit, both can otherwise link together, as long as can guarantee tightness therebetween.
Wherein said degassing environmental chamber D preferably adopts constant temperature water bath case 12, and it mainly comprises: temperature control panel 13, tank 14 and tank body draw-in groove 15.Tank body draw-in groove 15 is arranged in the tank 14, is used for fixed set gas tank B; Temperature control panel 13 is arranged at sink outer walls, is used for regulating the temperature of water in the tank 14.
Adopting above-mentioned vacuum air-taking system to carry out gas hydrates drills the vacuum extraction process of on-the-spot rock core gas and may further comprise the steps:
(1) early-stage preparations
Each gather gas before, special seal gum pad 9 is placed the cylindrical cavity bottom of cylinder on the platform 7 of bleeding, then be screwed into band aspirating hole screw rod 8, and with a word screwdriver being with aspirating hole screw rod 8 to tighten, namely compress seal gasket 9.
Check whether tank body sealing ring 2 and Cap for tin body sealing ring 3 place, and put into saturated brine in plastic cistern 24, and the degree of depth is advisable so that air collector is flooded fully.
Open the valve switch 6 of Cap for tin body 4, Cap for tin body 4 is submerged in fully in the plastic cistern 24 that holds saturated brine, to discharge wherein air.
(2) deaeration
Earlier the rock core that hydrate probe boring is obtained is rapidly with the clear water flushing, weigh or measure volume after hasten to put into air collector tank body 1, the tank body 1 that core sample then will be housed is immersed in the plastic cistern 24 that saturated brine is housed fully, to discharge wherein air.
Under water Cap for tin body 4 is buckled on the tank body 1, with isolated plant Cap for tin body 4 is tightened sealing, constitute a complete air collector B, discharge wherein air simultaneously, as shown in Figure 3.Then close the valve switch 6 of secondary hole pipe 5 on the Cap for tin body 4, so that air collector and the external world are isolated fully.
(3) make negative pressure
As shown in Figure 3, utilize rubber pipette bulb to discharge rubber under water and connect air in the flexible pipe 23, close the straight pipe valve 17 of making glass tube with vacuum 16, then rubber is connected flexible pipe 23 1 ends and be fixed on the secondary hole of the Cap for tin body pipe 5, the other end is fixedly attached on the straight pipe of making glass tube with vacuum 16; Then an end of rubber connection flexible pipe 22 is connected on the side siphunculus of making glass tube with vacuum 16, the other end connects on the aspirating hole of vacuum pump 19.
It is uprightly steady to lay air collector B, opens side siphunculus valve 18, opens the gauge tap 20 of vacuum pump, treat that barometer scale 21 stable reading continue half a minute after, successively close side siphunculus valve 18 and vacuum pump switch 20.At this moment, make glass tube with vacuum 16 and formed stable vacuum negative pressure condition.
Open the valve switch 6 on the pipe of the secondary hole of Cap for tin body, slowly open the straight pipe valve 17 of making glass tube with vacuum 16 again.This moment, air collector inside was communicated with manufacturing glass tube with vacuum 16, and the saturated brine in the air collector flows under the effect of negative pressure to be made in the glass tube with vacuum 16.Behind the stable level (pressure reaches balance), close the valve switch 6 on the pipe of the secondary hole of Cap for tin body in the glass tube with vacuum to be manufactured, namely form negative pressure in the air collector B.Open the side siphunculus valve 18 of glass tube with vacuum 16, after treating to return to normal atmosphere (An) in the glass tube with vacuum, extract glass tube with vacuum 16.
(4) the constant temperature degassing
Be contained with the tank body draw-in groove 15 that hydrate probe boring core sample and inner air collector with vacuum negative pressure condition are put into 40 ℃ constant temperature water bath case 12 with above-mentioned, and make water flooding Cap for tin body 4 in the constant temperature water bath case tank 14, the heated at constant temperature degassing in 2 hours can be carried out gas extraction.
(5) extracting gases
With flat the crouching in the plastic cistern 24 of splendid attire saturated brine of air collector of finishing the degassing, the rubber of having discharged air to be installed under water to be connected flexible pipe 23 on the secondary hole of Cap for tin body 4 pipe 5, rubber connects flexible pipe 23 other ends and places in the plastic cistern water body.
Stand up air collector.To the pin of bleeding of a small amount of saturated brine be housed by the aspirating hole 11 on the band aspirating hole screw rod 8, slowly pierce through special seal gum pad 9, enter the spherical crown shape aspirating chamber (in case the gas that has the salt solution in the pin of bleeding to be injected in air collector or the air collector enters the pin of bleeding, namely showing to penetrate aspirating chamber) at Cap for tin body top.
Open the valve switch 6 on the pipe of the secondary hole of Cap for tin body, the beginning extracting gases.Bleed finish after, gas in the needle tubing of will bleeding under saturated brine injects in the inverted special-purpose gas bottle that is full of saturated brine, tightens the gas collection bottle cap sealing under water and gets final product.
The gas of gas bottle, or be sent to the field experiment chamber and analyze at once, or being inverted into cold compartment of refrigerator preserves.
Further the rock core gas that extracts by above-mentioned steps is analyzed, and in conjunction with the hydrocarbon gas amount that the core sample quality of testing and this collected rock core discharge, can be declared fast and accurately and know whether the probing scene exists gas hydrates.
Below only be that preferred embodiment of the present invention is described; technical scheme of the present invention is not limited to this; the any known distortion that those skilled in the art do on the basis of major technique of the present invention design all belongs to the claimed technology category of the present invention, and the concrete protection domain of the present invention is as the criterion with the record of claims.
Claims (8)
1. vacuum extraction method that gas hydrates are drilled on-the-spot rock core gas, it is characterized in that: described vacuum extraction method is to drill on-the-spot rock core gas vacuum extraction system by the gas hydrates of special use to realize, described vacuum extraction system comprises vacuum unit (A), air collector (B), bleed unit (C) and the degassing environmental chamber (D), described air collector (B) comprises tank body (1) and Cap for tin body (4), be formed with main aperture and secondary hole on the described Cap for tin body (4), the secondary hole pipe (5) that has valve switch (6) is installed on the described secondary hole, the described unit of bleeding (C) is set on the described main aperture, described main aperture is communicated with the aspirating chamber of the described unit of bleeding (C), and described vacuum extraction method may further comprise the steps:
Step 1, the core sample that will drill collection in worksite clean and to be placed in the air collector (B), and the air of discharging in the air collector (B) also makes its inside and isolate from outer air;
Step 2, utilize vacuum unit (A) in described air collector (B), to form negative pressure of vacuum;
Step 3, the air collector (B) that will form negative pressure of vacuum are put into degassing environmental chamber (D), and core sample was wherein outgased in temperature condition and the time period set;
Step 4, extract gas in the air collector (B) by the unit of bleeding (C).
2. vacuum extraction method according to claim 1, it is characterized in that: described step 1 comprises following concrete steps:
1), the core sample that will drill collection in worksite cleans and to be placed in the tank body (1) of air collector, open the valve switch (6) on the secondary hole pipe of Cap for tin body (4) (5), and under the saturated brine environment described Cap for tin body (4) is being sealedly connected on the described tank body (1), utilize the air in the saturated brine discharge air collector (B);
2), close the valve switch (6) on the secondary hole pipe of Cap for tin body (4) (5) so that air collector (B) is inner isolated fully with outside air.
3. vacuum extraction method according to claim 1 and 2, air collector (B) is characterised in that: wherein said tank body (1) is the core structure of an end opening, end sealing, openend is used for putting into core sample, the openend outer wall is provided with external screw thread, and the outer wall groove in the external screw thread lower end is equipped with first sealing ring (2); The complete opening of one end of described Cap for tin body (4), the other end is provided with described secondary hole and main aperture, the openend inwall of described Cap for tin body (4) is provided with internal thread, described internal thread top forms round table-like inner chamber, the top of round table-like inner chamber is as described main aperture, between described internal thread top and round table-like intracavity bottom, be formed with a transition platform, described transition platform is provided with second sealing ring (3), described secondary hole pipe (5) is provided with described valve switch (6) in the Cap for tin body outside, when described Cap for tin body (4) was tightened on the described tank body (1), Cap for tin body (4) openend inwall pushed first sealing ring (2), tank body (1) openend ora terminalis pushes second sealing ring (3) thereby forms the air collector of sealing fully.
4. according to each described vacuum extraction method of claim 1-3, it is characterized in that, wherein said vacuum unit (A) comprises to be made glass tube with vacuum (16), vacuum pump (19) and is connected flexible pipe (22,23), described manufacturing glass tube with vacuum (16) comprises a straight pipe and a side siphunculus, straight pipe valve (17) is housed on the described straight pipe, side siphunculus valve (18) is housed on the described side siphunculus, described step 2 further may further comprise the steps:
1), close the straight pipe valve of making on the glass tube with vacuum (16) (17), connection flexible pipe (23) one ends of discharging air are connected on the secondary hole pipe (5), the other end is connected on the straight pipe of making glass tube with vacuum (16);
2), another end that connects flexible pipe (22) is connected on the side siphunculus of making glass tube with vacuum (16), the other end is connected on the aspirating hole of vacuum pump (19);
3), open side siphunculus valve (18), start vacuum pump (19), form stable negative pressure of vacuum in the glass tube with vacuum 16 to be manufactured after, successively close side siphunculus valve (18) and vacuum pump (19);
4), successively open the straight pipe valve (17) that the secondary hole of Cap for tin body is managed the valve switch (6) on (5) and made glass tube with vacuum (16), treat that saturated brine in the air collector flows in the manufacturing glass tube with vacuum (16) and when reaching pressure balance under the negative pressure of vacuum effect, close the valve switch (6) on the secondary hole pipe of Cap for tin body (5), namely in air collector (B), form negative pressure of vacuum.
5. according to each described vacuum extraction method of claim 1-4, it is characterized in that, described degassing environmental chamber (D) is a constant temperature water bath case (12), described constant temperature water bath case (12) comprising: temperature control panel (13), tank (14) and tank body draw-in groove (15), described tank body draw-in groove (15) is arranged in the described tank (14), and described step 3 may further comprise the steps:
1), the air collector (B) that will hold core sample and form negative pressure of vacuum is put into the tank body draw-in groove (15) of constant temperature water bath case (12), and is made the water flooding air collector in the tank (14);
2), by the water temperature in temperature control panel (13) the control tank, setting after the degassing temperature core sample in the air collector can the degassing voluntarily under constant temperature, namely finishes the degasification process of core sample after reaching certain degassing time.
6. according to each described vacuum extraction method of claim 1-5, it is characterized in that, the wherein said unit of bleeding (C) comprises the platform of bleeding (7), band aspirating hole screw rod (8) and seal gasket (9), the described platform of bleeding (7) be two stacked cylindrical and be arranged at directly over the described main aperture, described cylindrical inside down is formed with the aspirating chamber of spherical crown shape, the bottom of described aspirating chamber and described main aperture UNICOM, the described cylindrical inside of going up is formed with interior cylindrical cavity, the extract opening at described aspirating chamber top is communicated with described interior cylindrical cavity, described seal gasket (9) is positioned in cylinder described at the bottom of the cylindrical cavity chamber and the low described extract opening that is connected to down cylinder downwards, described band aspirating hole screw rod (8) is arranged at described interior and downward the hanging down of interior cylindrical cavity of going up cylinder and is connected to described seal gasket (9), and described step 4 further may further comprise the steps:
1), the end that will discharge the connection flexible pipe of air is connected on the secondary hole pipe (5) on the air collector Cap for tin body of finishing the degassing, the other end is positioned in the water body in the water tank;
2), the pin of bleeding that a small amount of saturated brine will be housed is by the aspirating hole (11) on band aspirating hole screw rod (8), slowly puncture through seal rubber cushion (9) enters in the spherical crown shape aspirating chamber;
3), open the valve switch (6) on the pipe of the secondary hole of Cap for tin body so that be in atmospheric pressure state in the air collector, the beginning extracting gases, bleed finish after, inject in the inverted gas bottle gas of extracting out and sealing under water.
7. vacuum extraction method according to claim 6, it is characterized in that, described band aspirating hole screw rod (8) profile is the lower cylindrical shape, the top round pie, the center is provided with the aspirating hole (11) that two ends connect, the lower cylindrical outer wall has external screw thread, the interior cylindrical cavity inwall of the last cylinder of the described platform of bleeding (7) is formed with internal thread, the two formation is threaded, described band aspirating hole screw rod (8) top cake end face is provided with an in-line groove (10) of crossing the center, at the air collector (B) that Cap for tin body (4) is tightened against tank body (1) is gone up and forms sealing before, band aspirating hole screw rod (8) is tightened against in the last cylinder of the platform of bleeding by in-line groove (10) by a word screwdriver, and make band aspirating hole screw rod (8) lower end be squeezed in described seal gasket (9), guarantee that the gas in the air collector can not leak from the extract opening at aspirating chamber top.
8. the knowledge method of declaring of gas hydrates is characterized in that, may further comprise the steps: step 1, at probing collection in worksite core sample, and extract the gas that this core sample discharges according to each described method of claim 1-7; The size of step 2, the gas flow that extracts according to step 1 also judges to drill in the on-the-spot rock core whether have gas hydrates in conjunction with other features of core sample itself.
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| CN201310149073.2A CN103233729B (en) | 2013-04-26 | 2013-04-26 | The vacuum extraction method of the on-the-spot rock core gas of a kind of Gas Hydrate Drilling |
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| CN201310149073.2A CN103233729B (en) | 2013-04-26 | 2013-04-26 | The vacuum extraction method of the on-the-spot rock core gas of a kind of Gas Hydrate Drilling |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103823252A (en) * | 2014-03-27 | 2014-05-28 | 无锡同春新能源科技有限公司 | Mooring underwater drilling rig for prospecting surroundings of flammable ice in marine cold spring area |
| CN107881098A (en) * | 2017-12-16 | 2018-04-06 | 广西华竹生物科技有限公司 | A kind of strain improvement seeding tank for being easy to inoculation |
| CN110206504A (en) * | 2019-05-29 | 2019-09-06 | 广州海洋地质调查局 | A kind of production water metering of pressure maintaining rock core and produce gas metering device and its application method |
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| CN2690881Y (en) * | 2004-04-09 | 2005-04-06 | 徐光国 | Solid filing/liquid heat vacuum quantitative degassing device |
| CN102879236A (en) * | 2011-07-15 | 2013-01-16 | 中国石油化工股份有限公司 | Device and method for breaking tank and extracting gas |
| CN102967667A (en) * | 2012-11-19 | 2013-03-13 | 中国科学研究院广州地球化学研究所 | Device for qualitatively and quantitatively analyzing shale gas and using method of device |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2690881Y (en) * | 2004-04-09 | 2005-04-06 | 徐光国 | Solid filing/liquid heat vacuum quantitative degassing device |
| CN102879236A (en) * | 2011-07-15 | 2013-01-16 | 中国石油化工股份有限公司 | Device and method for breaking tank and extracting gas |
| CN102967667A (en) * | 2012-11-19 | 2013-03-13 | 中国科学研究院广州地球化学研究所 | Device for qualitatively and quantitatively analyzing shale gas and using method of device |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103823252A (en) * | 2014-03-27 | 2014-05-28 | 无锡同春新能源科技有限公司 | Mooring underwater drilling rig for prospecting surroundings of flammable ice in marine cold spring area |
| CN103823252B (en) * | 2014-03-27 | 2016-08-24 | 无锡同春新能源科技有限公司 | Band cable underwater drilling device at prospecting combustible ice ore deposit, cold spring district, ocean surrounding |
| CN107881098A (en) * | 2017-12-16 | 2018-04-06 | 广西华竹生物科技有限公司 | A kind of strain improvement seeding tank for being easy to inoculation |
| CN110206504A (en) * | 2019-05-29 | 2019-09-06 | 广州海洋地质调查局 | A kind of production water metering of pressure maintaining rock core and produce gas metering device and its application method |
| CN110206504B (en) * | 2019-05-29 | 2024-01-12 | 广州海洋地质调查局 | Water production metering and gas production metering device of pressure maintaining rock core and use method thereof |
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| CN103233729B (en) | 2015-08-12 |
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