CN112033851A - System and method for measuring residual gas volume of hydrocarbon source rock and method for measuring migration gas volume - Google Patents
System and method for measuring residual gas volume of hydrocarbon source rock and method for measuring migration gas volume Download PDFInfo
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Abstract
The invention provides a system and a method for measuring residual gas volume of hydrocarbon source rocks and a method for measuring migration gas volume, wherein the system for measuring residual gas volume of hydrocarbon source rocks comprises the following steps: a source rock sample tank; the temperature adjusting device is used for adjusting the temperature of the hydrocarbon source rock sample tank; the closed liquid tank is used for containing liquid, the liquid tank is positioned above the hydrocarbon source rock sample tank, and the liquid tank is communicated with the hydrocarbon source rock sample tank through a gas transmission pipe; and the liquid collecting cup is positioned below the liquid tank and is communicated with the liquid tank through a liquid conveying pipe. The method for measuring the residual gas quantity of the hydrocarbon source rock adopts a system for measuring the residual gas quantity of the hydrocarbon source rock to measure the residual gas quantity of a hydrocarbon source rock sample. The method for measuring the migration capacity of the hydrocarbon source rock comprises the following steps: determining the residual gas amount of the hydrocarbon source rock by adopting a method for measuring the residual gas amount of the hydrocarbon source rock; and subtracting the residual gas amount of the hydrocarbon source rock from the oil-gas resource amount of the hydrocarbon source rock to obtain the migration gas amount of the hydrocarbon source rock. The measuring method is simple, the measuring result is more accurate and reliable, the measuring equipment is simple in structure, convenient to operate and low in cost.
Description
Technical Field
The invention relates to the technical field of oil-gas exploration and development experiments, in particular to a system and a method for measuring residual gas volume of hydrocarbon source rocks and a method for measuring migration gas volume.
Background
In the field of oil and gas exploration, a stratum with the depth of 4500 meters to ten thousand meters is an enrichment area of deep oil and gas resources, and rich deep oil and gas resources exist in China, Europe, the middle east, North America, Lame and other areas, and currently, the explored deep oil fields comprise American gulf Kaskida oil and gas fields (buried depth of 7356 meters, the recoverable reserve of 1 hundred million tons), American gulf basin Augur oil and gas fields (buried depth of 6511 meters to 6540 meters), American West inner basin Adam concave Milan oil and gas fields (buried depth of 7663 meters to 8103 meters, the recoverable reserve of 365 parties) and the like, and the deep oil and gas resource exploration and development are the key points of global oil and gas field attack.
From the perspective of finding oil and gas resources, the concept of hydrocarbon source rocks is very important, and according to the theory of organic school, the existing oil and gas resources are all generated from the hydrocarbon source rocks. For deep oil and gas resources, the finding of the position of the hydrocarbon source rock and the related residual gas amount has very important significance for finding the deep oil and gas resources.
The hydrocarbon generation history research is carried out aiming at the source rocks at different layers, and the research on the 'how much oil gas has been discharged and how much oil gas has remained' of the source rocks in geological history is of great significance for mastering the scale of potential gas reservoirs. At present, for how much oil and gas in the hydrocarbon source rocks enter a reservoir stratum (namely migration gas volume of the hydrocarbon source rocks), the oil and gas reserves in the reservoir stratum are determined mainly by analyzing biomarkers of the oil and gas in the reservoir stratum or by isotope research, but the research method is complex.
Disclosure of Invention
Aiming at the defects of the prior art, the inventor provides a new idea for determining the oil and gas reserves in the reservoir, namely determining how much residual gas exists in the hydrocarbon source rocks at present, and subtracting the residual gas from the known oil and gas resources of the hydrocarbon source rocks to obtain the migration gas of the hydrocarbon source rocks, namely the oil and gas reserves in the reservoir.
The invention aims to provide a system and a method for measuring residual gas volume of hydrocarbon source rocks and a method for measuring migration gas volume, so as to measure the residual gas volume and the migration gas volume in the hydrocarbon source rocks.
In order to achieve the above object, the present invention provides a system for measuring residual gas amount of hydrocarbon source rock, comprising: a closed source rock sample tank for holding a source rock sample; the temperature adjusting device is used for adjusting the temperature of the hydrocarbon source rock sample tank; the closed liquid tank is used for containing liquid, the liquid tank is positioned above the source rock sample tank, and the liquid tank is communicated with the source rock sample tank through a gas transmission pipe; and the liquid collecting cup is positioned below the liquid tank and is communicated with the liquid tank through a liquid conveying pipe.
The system for measuring the residual gas amount of the hydrocarbon source rocks is characterized in that a first valve is arranged on the gas transmission pipe, a second valve is arranged on the liquid conveying pipe, and the gas transmission pipe and the liquid conveying pipe are respectively connected with the liquid tank in a detachable and sealed mode.
The system for measuring the residual gas amount of the hydrocarbon source rock is characterized in that the liquid tank is further connected with an air guide pipe and a liquid guide pipe, the upper end of the air guide pipe is hermetically connected and communicated with the liquid tank, the lower end opening of the air guide pipe is blocked by a first rubber head, the upper end of the air transmission pipe is hermetically connected with a first needle head, and the first needle head is inserted into the first rubber head and extends into the air guide pipe to detachably connect the air transmission pipe and the liquid tank together; the upper end of the liquid guide pipe is hermetically connected and communicated with the liquid tank, the lower end opening of the liquid guide pipe is blocked by a second rubber head, the upper end of the liquid guide pipe is hermetically connected with a second needle head, and the second needle head is inserted into the second rubber head and extends into the liquid guide pipe to detachably connect the liquid guide pipe and the liquid tank together.
The system for measuring the residual gas amount of the hydrocarbon source rocks is characterized in that the top end of the gas guide tube and the top end of the liquid guide tube are hermetically connected with the bottom wall of the liquid tank, and the top end of the gas guide tube and the top end of the liquid guide tube are not higher than the inner surface of the bottom wall of the liquid tank.
The system for measuring residual gas content of hydrocarbon source rock as described above, wherein the height of the inner cavity of the liquid tank is smaller than the length of the inner cavity of the liquid tank.
The system for measuring the residual gas amount of the hydrocarbon source rocks is characterized in that the number of the hydrocarbon source rock sample tanks is multiple, the number of the liquid collecting cups is multiple, the hydrocarbon source rock sample tanks are connected with the liquid tanks in a one-to-one correspondence manner, and the liquid collecting cups are connected with the liquid tanks in a one-to-one correspondence manner.
The system for measuring the residual gas amount of the hydrocarbon source rocks comprises an electronic balance and a computer, wherein the liquid collecting cup is placed on the electronic balance, and the electronic balance is electrically connected with the computer.
The invention also provides a method for measuring the residual gas quantity of the hydrocarbon source rock, which adopts the system for measuring the residual gas quantity of the hydrocarbon source rock to measure the residual gas quantity of the hydrocarbon source rock sample, and the method for measuring the residual gas quantity of the hydrocarbon source rock comprises the following steps: putting a hydrocarbon source rock sample into the hydrocarbon source rock sample tank, sealing the hydrocarbon source rock sample tank, filling liquid into the liquid tank, and sealing the liquid tank, wherein the liquid level of the liquid is higher than the top ends of the gas conveying pipe and the liquid conveying pipe; starting the temperature adjusting device to enable the hydrocarbon source rock sample in the hydrocarbon source rock sample tank to reach and maintain a preset temperature, wherein the hydrocarbon source rock sample releases gas at the preset temperature, the gas enters the liquid in the liquid tank through the gas conveying pipe and forms bubbles, and the liquid with the same volume as the bubbles flows out of the liquid tank and flows into the liquid collecting cup through the liquid conveying pipe; and when no gas is released in the hydrocarbon source rock sample tank, acquiring the volume value of the liquid in the liquid collecting cup, wherein the volume value is equal to the residual gas amount of the hydrocarbon source rock sample.
The method for measuring the residual gas amount of the hydrocarbon source rocks comprises the steps that a first valve is arranged on the gas transmission pipe, a second valve is arranged on the liquid conveying pipe, and the gas transmission pipe and the liquid conveying pipe are detachably connected with the liquid tank in a sealing mode; the method for measuring the residual gas quantity of the hydrocarbon source rock further comprises the following steps: before the temperature adjusting device is started, closing the first valve and the second valve, and after the hydrocarbon source rock sample reaches the preset temperature, opening the first valve and the second valve; in the process that the hydrocarbon source rock sample releases gas, the liquid level height of liquid in the liquid tank is monitored at any time, the first valve and the second valve are closed before the liquid level of the liquid in the liquid tank drops to be lower than the top end of the gas conveying pipe or the top end of the liquid conveying pipe, the gas conveying pipe and the liquid conveying pipe are detached and separated from the liquid tank, then the gas conveying pipe and the liquid conveying pipe are connected with a standby liquid tank filled with liquid, and then the first valve and the second valve are opened.
The invention also provides a method for measuring the migration volume of the hydrocarbon source rock, which comprises the following steps: determining the residual gas amount of the hydrocarbon source rock by adopting the method for measuring the residual gas amount of the hydrocarbon source rock; and subtracting the residual gas amount of the hydrocarbon source rock from the oil-gas resource amount of the hydrocarbon source rock to obtain the migration gas amount of the hydrocarbon source rock.
The system and the method for measuring the residual gas volume of the hydrocarbon source rock and the method for measuring the migration gas volume have the characteristics and advantages that:
1. the residual gas quantity of the hydrocarbon source rock sample is measured by utilizing the constant-pressure isochoric principle, the hydrocarbon source rock in the hydrocarbon source rock sample tank is heated to release gas, the gas enters the liquid tank filled with liquid through the gas conveying pipe to form bubbles, when one bubble is generated, the liquid with the same volume as the bubble flows into the liquid collecting cup from the liquid tank through the liquid conveying pipe, the residual gas quantity of the hydrocarbon source rock sample can be determined by obtaining the volume value of the liquid in the liquid collecting cup, and further the migration gas quantity of the hydrocarbon source rock is obtained.
2. The invention provides a new idea for determining the oil-gas reserves in the reservoir, the migration gas quantity of the hydrocarbon source rocks, namely the oil-gas reserves in the reservoir, can be obtained by determining the residual gas quantity of the hydrocarbon source rocks and subtracting the residual gas quantity from the known oil-gas resource quantity of the hydrocarbon source rocks, and the measuring method is simple.
Drawings
The drawings are only for purposes of illustrating and explaining the present invention and are not to be construed as limiting the scope of the present invention. Wherein:
FIG. 1 is a schematic diagram of one embodiment of a system for measuring residual gas content of a hydrocarbon source rock of the present invention;
FIG. 2 is a schematic view of the assembly of the liquid tank, airway tube and catheter of the present invention;
FIG. 3 is a schematic view of the liquid tank of the present invention before it is connected to the gas pipe and the liquid pipe;
FIG. 4 is a schematic diagram of another embodiment of a system for measuring residual gas content of a hydrocarbon source rock of the present invention;
FIG. 5 is a graph of the cumulative amount of residual gas released from a No. 12 source rock sample.
Main element number description:
1. a source rock sample tank; 2. a temperature adjustment device; 3. a liquid tank; 4. a liquid collecting cup; 5. a gas delivery pipe; 6. a transfusion tube; 7. a first valve; 8. a second valve; 9. an air duct; 10. a catheter; 11. a first needle; 12. a second needle; 13. a third valve; 14. a fourth valve; 15. an electronic balance; 16. a computer; 17. fixing a bracket; 18. hooking; 19. a circular ring; q, air bubbles; l, liquid.
Detailed Description
In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings. In the description of the present invention, it is to be understood that the terms "upper", "lower", "top", "bottom", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
As shown in fig. 1, 2, and 3, the invention provides a system for measuring residual gas amount of a hydrocarbon source rock, which includes a hollow and sealed hydrocarbon source rock sample tank 1, a temperature adjusting device 2, a hollow and sealed liquid tank 3, and a hollow liquid collecting cup 4, wherein the hydrocarbon source rock sample tank 1 is used for accommodating a hydrocarbon source rock sample, the temperature adjusting device 2 is used for adjusting the temperature of the hydrocarbon source rock sample tank 1, that is, the hydrocarbon source rock sample tank 1 can be heated and the hydrocarbon source rock sample tank 1 can be insulated, the hydrocarbon source rock sample in the hydrocarbon source rock sample tank 1 is heated to release gas by heating the hydrocarbon source rock sample tank 1, for example, the temperature adjusting device 2 is a constant temperature water bath and is heated by an electric heating method;
the liquid tank 3 is used for containing liquid L (such as water), the liquid tank 3 is positioned above the hydrocarbon source rock sample tank 1, the liquid tank 3 is communicated with the hydrocarbon source rock sample tank 1 through the gas transmission pipe 5, so that gas released by the hydrocarbon source rock sample enters the liquid tank 3 from the hydrocarbon source rock sample tank 1 through the gas transmission pipe 5, and the liquid L is filled in the liquid tank 3, and the gas forms bubbles Q after entering the liquid;
liquid collecting cup 4 is located liquid tank 3 below, and liquid collecting cup 4 passes through transfer line 6 with liquid tank 3 and communicates, and every bubble Q that produces in liquid tank 3, the liquid that has the equivalent volume falls into transfer line 6 from liquid tank 3, again flows into liquid collecting cup 4 through transfer line 6 in, and the volume of liquid in liquid collecting cup 4 is the volume of the gas that hydrocarbon source rock specimen released, is exactly the residual tolerance of hydrocarbon source rock specimen, for example liquid collecting cup 4 is the beaker, directly reads the scale on the beaker, can learn the volume of liquid.
The residual gas quantity of the hydrocarbon source rock sample is measured by utilizing the constant-pressure isochoric principle, the hydrocarbon source rock sample in the hydrocarbon source rock sample tank 1 is heated to release gas, the gas enters the liquid tank 3 filled with liquid L through the gas conveying pipe 5 to form a bubble Q, and when one bubble Q is generated, liquid with the same volume as the bubble Q flows into the liquid collecting cup 4 from the liquid tank 3 through the liquid conveying pipe 6, the residual gas quantity of the hydrocarbon source rock sample can be determined by obtaining the volume value of the liquid in the liquid collecting cup 4, so that the migration gas quantity of the hydrocarbon source rock is obtained.
In addition, the liquid tank 3 of the present invention can automatically collect gas to provide an experimental sample for gas component analysis.
As shown in fig. 1, further, a first valve 7 is arranged on the gas pipe 5, the gas pipe 5 is detachably and hermetically connected with the liquid tank 3, a second valve 8 is arranged on the liquid conveying pipe 6, and the liquid conveying pipe 6 is detachably and hermetically connected with the liquid tank 3. Because gas-supply pipe 5 and transfer line 6 are connected with liquid tank 3 detachably, when liquid L's liquid level can not satisfy the experiment requirement in liquid tank 3, close first valve 7 and second valve 8 earlier, pull down gas-supply pipe 5 and transfer line 6 from liquid tank 3, be connected with reserve liquid tank 3 that is equipped with liquid, open first valve 7 and second valve 8 again.
As shown in fig. 2 and 3, in a specific embodiment, an air duct 9 and a liquid guide tube 10 are further connected to the liquid tank 3, the upper end of the air duct 9 is hermetically connected and communicated with the liquid tank 3, the lower end opening of the air duct 9 is blocked by a first rubber head, the upper end of the air duct 5 is hermetically connected with a first needle 11, and the first needle 11 is inserted into the first rubber head and extends into the air duct 9 to connect and detachably connect the air duct 5 and the liquid tank 3; the upper end of the liquid guide tube 10 is hermetically connected and communicated with the liquid tank 3, the lower end opening of the liquid guide tube 10 is blocked by a second rubber head, the upper end of the liquid guide tube 6 is hermetically connected with a second needle head 12, the second needle head 12 is inserted into the second rubber head and extends into the liquid guide tube 10, and the liquid guide tube 6 is communicated with the liquid tank 3 and is detachably connected together.
When changing liquid jar 3, earlier first valve 7 and second valve 8 close, pull out first needle 11 from first rubber head again, pull out second needle 12 from second rubber head in, then insert first needle 11 in the first rubber head on the air duct 9 that reserve liquid jar 3 that is equipped with liquid is connected, insert second needle 12 in the second rubber head on the catheter 10 that reserve liquid jar 3 that is equipped with liquid is connected, later open first valve 7 and second valve 8 again. This scheme of adoption only needs extract and insert syringe needle and can change liquid tank 3, and the operation is very convenient and fast.
Wherein, every liquid jar 3 all has air duct 9, catheter 10, first rubber head and second rubber head, and liquid jar 3, air duct 9, catheter 10, first rubber head and second rubber head are as an organic whole (as shown in figure 2), and when changing, also are whole changes.
However, the present invention is not limited to this, the liquid tank 3 may not be provided with the air duct 9 and the liquid guiding tube 10, but the first rubber head and the second rubber head directly block the air inlet and the liquid outlet of the liquid tank 3, and when replacing, the first needle 11 on the air pipe 5 and the second needle 12 on the infusion tube 6 are respectively inserted into the first rubber head and the second rubber head, so as to also realize the quick replacement of the liquid tank 3.
As shown in fig. 2 and 3, further, the top end of the air duct 9 and the top end of the liquid guiding tube 10 are hermetically connected with the bottom wall of the liquid tank 3, the top end of the air duct 9 is not higher than the inner surface of the bottom wall of the liquid tank 3, and the top end of the liquid guiding tube 10 is not higher than the inner surface of the bottom wall of the liquid tank 3.
According to the pressure balance principle, the gas outlet of the gas guide tube 9 and the liquid inlet of the liquid guide tube 10 cannot be lower than the liquid level height all the time in the experiment process, so that the liquid in the liquid tank 3 can be smoothly discharged, therefore, the top ends of the gas guide tube 9 and the liquid guide tube 10 are in sealing connection with the bottom wall of the liquid tank 3, the top ends of the gas guide tube 9 and the liquid guide tube 10 are not higher than the inner surface of the bottom wall of the liquid tank 3, the height difference between the gas outlet of the gas guide tube 9 and the liquid inlet of the liquid guide tube 10 and the liquid level can be increased as much as possible, and the.
As shown in fig. 2 and 3, the airway tube 9 is provided with a third valve 13, and the catheter 10 is provided with a fourth valve 14.
In another embodiment, the gas pipe 5 and the infusion tube 6 are directly connected with the bottom wall of the liquid tank 3 in a sealing way, but are not connected with the liquid tank 3 through the gas guide tube 9 and the liquid guide tube 10, and the top end of the gas pipe 5 and the top end of the infusion tube 6 are not higher than the inner surface of the bottom wall of the liquid tank 3. In a similar way, the height difference between the air outlet of the air delivery pipe 5 and the liquid inlet of the liquid delivery pipe 6 and the liquid level can be increased as much as possible, and the time for discharging the liquid smoothly is prolonged.
As shown in fig. 1, 2, and 3, the height of the inner cavity of the liquid tank 3 is smaller than the length of the inner cavity of the liquid tank 3, that is, the liquid tank 3 is flat, so as to reduce the pressure difference generated by the liquid column and reduce the flow resistance of the gas (i.e., bubbles Q) rising.
As shown in fig. 4, in a preferred embodiment, the number of the hydrocarbon source rock sample tanks 1 is multiple, the number of the liquid tanks 3 is multiple, the number of the catch cups 4 is multiple, the hydrocarbon source rock sample tanks 1 are connected to the liquid tanks 3 in a one-to-one correspondence, and the catch cups 4 are connected to the liquid tanks 3 in a one-to-one correspondence. Through setting up a plurality of hydrocarbon source rock specimen jar 1, a plurality of liquid jar 3 and a plurality of album of liquid cup 4, can measure the residual tolerance of a plurality of hydrocarbon source rock specimens simultaneously, the convenient contrast different interval hydrocarbon source rock's residual tolerance what.
In the embodiment shown in fig. 1, the system for measuring the residual gas amount of the hydrocarbon source rock further comprises an electronic balance 15 and a computer 16, the liquid collecting cup 4 is placed on the electronic balance 15, the electronic balance 15 is electrically connected with the computer 16, the electronic balance 15 measures the mass of the liquid in the liquid collecting cup 4 and transmits the measured data to the computer 16 for storage, and the computer 16 can calculate the volume of the liquid according to the mass and density data of the liquid by the formula v ═ m/ρ, wherein m is the mass of the liquid, v is the volume of the liquid, ρ is the density of the liquid, and the residual gas amount of the hydrocarbon source rock sample is equal to v. For example, there are a plurality of electronic balances 15, and a plurality of drip cups 4 are placed on the plurality of electronic balances 15, respectively (as shown in fig. 4).
In the present embodiment, the electronic balance 15 and the computer 16 are provided, so that the measurement accuracy and the degree of automation can be further improved.
In the present embodiment, the gas measurement accuracy depends on the accuracy of the electronic balance 15, and for example, if the accuracy of the electronic balance 15 is 0.01g, the gas measurement accuracy is 0.01mL, and if the accuracy of the electronic balance 15 is 0.001g, the gas measurement accuracy is 0.001mL, and the gas measurement accuracy is high.
As shown in fig. 1 and fig. 3, further, the system for measuring the residual gas amount of the hydrocarbon source rock further includes a fixed support 17, the liquid tank 3 is suspended below the fixed support 17, for example, a hook 18 is suspended below the fixed support 17, a ring 19 is connected above the liquid tank 3, and the ring 19 is suspended on the hook 18. The liquid tank 3 can be replaced quickly and conveniently by adopting a structure that the circular ring 19 is matched with the hook 18.
The invention also provides a method for measuring the residual gas quantity of the hydrocarbon source rock, which adopts the system for measuring the residual gas quantity of the hydrocarbon source rock to measure the residual gas quantity of the hydrocarbon source rock sample, and the method comprises the following steps:
step S10: putting a hydrocarbon source rock sample into the hydrocarbon source rock sample tank 1, then sealing the hydrocarbon source rock sample tank 1, putting the hydrocarbon source rock sample tank 1 into the temperature regulating device 2, putting liquid into the liquid tank 3, and making the liquid level of the liquid higher than the top end of the gas transmission pipe 5 and the top end of the liquid transmission pipe 6, then sealing the liquid tank 3, and under the condition that the liquid tank 3 is not influenced by the temperature regulating device 2, making the liquid tank 3 as close as possible to the outlet of the hydrocarbon source rock sample tank 1;
step S20: starting the temperature adjusting device 2, heating the hydrocarbon source rock sample in the hydrocarbon source rock sample tank 1 to enable the hydrocarbon source rock sample in the hydrocarbon source rock sample tank 1 to reach and maintain a preset temperature, releasing gas from the hydrocarbon source rock sample at the preset temperature (the preset temperature is constant), enabling the gas to enter the liquid L in the liquid tank 3 through the gas conveying pipe 5 to form bubbles Q, enabling liquid with the volume equal to that of the bubbles Q to flow out of the liquid tank 3 and flow into the liquid collecting cup 4 through the liquid conveying pipe 6 every time one bubble Q is generated, wherein the preset temperature is the formation temperature for example;
step S30: and when no gas is released in the hydrocarbon source rock sample tank 1, obtaining the volume value of the liquid in the liquid collecting cup 4, wherein the volume value is equal to the residual gas amount of the hydrocarbon source rock sample.
Further, be equipped with first valve 7 on the gas-supply pipe 5, be equipped with second valve 8 on the transfer line 6, gas-supply pipe 5 and transfer line 6 and 3 detachably sealing connection of liquid jar, the measuring method of hydrocarbon source rock residual capacity still includes:
in the step S20, before the temperature adjustment device 2 is turned on, the first valve 7 and the second valve 8 are closed, and after the source rock sample reaches the preset temperature, the first valve 7 and the second valve 8 are opened;
in the step S20, during the process of releasing gas from the hydrocarbon source rock sample, the liquid level of the liquid in the liquid tank 3 is monitored at any time, before the liquid level of the liquid in the liquid tank 3 drops to a level lower than the top end of the gas pipe 5 or the top end of the liquid pipe 6, the first valve 7 and the second valve 8 are closed, the gas pipe 5 and the liquid pipe 6 are detached from the liquid tank 3, then the gas pipe 5 and the liquid pipe 6 are connected with the standby liquid tank 3 filled with (for example, full of) liquid, and then the first valve 7 and the second valve 8 are opened.
Furthermore, the system for measuring the residual gas content of the hydrocarbon source rock further comprises the air duct 9, the liquid guide tube 10, the first rubber head, the second rubber head, the first needle 11, the second needle 12, the third valve 13 and the fourth valve 14, and the step of replacing the liquid tank comprises the following steps:
the first valve 7, the second valve 8, the third valve 13 and the fourth valve 14 of the liquid tank 3 are closed firstly, then the first needle 11 on the air pipe 5 is pulled out from the first rubber head on the air duct 9 connected with the liquid tank 3, the second needle 12 on the liquid pipe 6 is pulled out from the second rubber head on the liquid guide pipe 10 connected with the liquid tank 3, then the first needle 11 on the air pipe 5 is inserted into the first rubber head on the standby liquid tank 3 filled with liquid, the second needle 12 on the liquid pipe 6 is inserted into the second rubber head on the standby liquid tank 3 filled with liquid, and then the first valve 7, the second valve 8, the air duct 9 connected with the standby liquid tank 3 filled with liquid, the third valve 13 and the fourth valve 14 on the liquid guide pipe 10 are opened.
The invention also provides a method for measuring the migration volume of the hydrocarbon source rock, which comprises the following steps:
determining the residual gas amount of the hydrocarbon source rock by adopting the method for measuring the residual gas amount of the hydrocarbon source rock;
and subtracting the residual gas amount of the hydrocarbon source rock from the oil-gas resource amount of the hydrocarbon source rock to obtain the migration gas amount of the hydrocarbon source rock.
The invention provides a new idea for determining the oil and gas reserves in the reservoir, and the measuring method is simple and the measuring result is accurate and reliable.
The following description will be given taking one practical application of the present invention as an example:
selecting a full-diameter hydrocarbon source rock sample at the position of the NX2 well adjacent to the well depth, recording the sample as a No. 12 sample, wherein the mass of the sample is 5.39kg, measuring the residual gas volume by adopting the system and the method for measuring the residual gas volume of the hydrocarbon source rock, specifically, loading the hydrocarbon source rock sample into a hydrocarbon source rock sample tank 1, placing the hydrocarbon source rock sample tank into a temperature regulating device 2, regulating the temperature of the hydrocarbon source rock sample tank 1 loaded with the No. 12 sample by adopting the temperature regulating device 2, heating to the formation temperature of 90.9 ℃, and then preserving the temperature until no gas is released from the hydrocarbon source rock sample tank 1. FIG. 5 is a graph of the cumulative amount of residual gas released from a source rock sample for sample number 12.
The invention can accurately measure the residual gas amount of the hydrocarbon source rock, realizes constant-pressure equal-volume automatic measurement of the gas, has simple structure, reliable measurement result and high measurement precision, and can save a large amount of field measurement human resources and greatly reduce the equipment cost. The method can accurately measure the residual gas amount of the hydrocarbon source rock, can automatically collect the gas and provides an experimental sample for gas component analysis. The invention can be used under complex working conditions such as a laboratory or a drilling site.
Therefore, the measuring system of the invention is a continuous automatic constant volume metering device of the non-measured gas output (namely the gas output speed is not constant), and has the advantages of simple structure, convenient operation, high automation degree and low device cost; the method for measuring the residual gas quantity of the hydrocarbon source rock is a measuring method capable of quickly, directly and accurately measuring the residual gas quantity of the hydrocarbon source rock, and the measuring structure is accurate and reliable.
The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. Any equivalent changes and modifications that can be made by one skilled in the art without departing from the spirit and principles of the invention should be considered within the scope of the invention. It should be noted that the components of the present invention are not limited to the above-mentioned whole application, and various technical features described in the present specification can be selected to be used alone or in combination according to actual needs, so that the present invention naturally covers other combinations and specific applications related to the invention.
Claims (10)
1. A system for measuring residual gas quantity of hydrocarbon source rocks is characterized by comprising:
a closed source rock sample tank for holding a source rock sample;
the temperature adjusting device is used for adjusting the temperature of the hydrocarbon source rock sample tank;
the closed liquid tank is used for containing liquid, the liquid tank is positioned above the source rock sample tank, and the liquid tank is communicated with the source rock sample tank through a gas transmission pipe;
and the liquid collecting cup is positioned below the liquid tank and is communicated with the liquid tank through a liquid conveying pipe.
2. The system for measuring the residual gas content in hydrocarbon source rocks according to claim 1, wherein a first valve is arranged on the gas transmission pipe, a second valve is arranged on the liquid conveying pipe, and the gas transmission pipe and the liquid conveying pipe are respectively connected with the liquid tank in a detachable and sealed mode.
3. The system for measuring the residual gas amount of hydrocarbon source rock according to claim 2, wherein the liquid tank is further connected with a gas guide tube and a liquid guide tube, the upper end of the gas guide tube is hermetically connected and communicated with the liquid tank, the lower end opening of the gas guide tube is blocked by a first rubber head, the upper end of the gas transmission tube is hermetically connected with a first needle head, and the first needle head is inserted into the first rubber head and extends into the gas guide tube to detachably connect the gas transmission tube and the liquid tank together;
the upper end of the liquid guide pipe is hermetically connected and communicated with the liquid tank, the lower end opening of the liquid guide pipe is blocked by a second rubber head, the upper end of the liquid guide pipe is hermetically connected with a second needle head, and the second needle head is inserted into the second rubber head and extends into the liquid guide pipe to detachably connect the liquid guide pipe and the liquid tank together.
4. The system for measuring residual gas content in hydrocarbon source rock according to claim 3, wherein the top end of the gas-guide tube and the top end of the liquid guide tube are hermetically connected with the bottom wall of the liquid tank, and the top end of the gas-guide tube and the top end of the liquid guide tube are not higher than the inner surface of the bottom wall of the liquid tank.
5. The system of claim 1, wherein a height of the interior cavity of the fluid tank is less than a length of the interior cavity of the fluid tank.
6. The system for measuring the residual gas content in the hydrocarbon source rocks according to claim 1, wherein the number of the hydrocarbon source rock sample tanks is plural, the number of the liquid collecting cups is plural, the plural hydrocarbon source rock sample tanks are connected to the plural liquid tanks in a one-to-one correspondence, and the plural liquid collecting cups are connected to the plural liquid tanks in a one-to-one correspondence.
7. The system for measuring the amount of hydrocarbon source rock residual gas of claim 1, further comprising an electronic balance on which the drip cup is placed and a computer electrically connected to the electronic balance.
8. A method for measuring residual gas quantity of hydrocarbon source rocks is characterized in that the method for measuring residual gas quantity of hydrocarbon source rocks adopts the system for measuring residual gas quantity of hydrocarbon source rocks as claimed in any one of claims 1 to 7, and the method for measuring residual gas quantity of hydrocarbon source rocks comprises the following steps:
putting a hydrocarbon source rock sample into the hydrocarbon source rock sample tank, sealing the hydrocarbon source rock sample tank, filling liquid into the liquid tank, and sealing the liquid tank, wherein the liquid level of the liquid is higher than the top ends of the gas conveying pipe and the liquid conveying pipe;
starting the temperature adjusting device to enable the hydrocarbon source rock sample in the hydrocarbon source rock sample tank to reach and maintain a preset temperature, wherein the hydrocarbon source rock sample releases gas at the preset temperature, the gas enters the liquid in the liquid tank through the gas conveying pipe and forms bubbles, and the liquid with the same volume as the bubbles flows out of the liquid tank and flows into the liquid collecting cup through the liquid conveying pipe;
and when no gas is released in the hydrocarbon source rock sample tank, acquiring the volume value of the liquid in the liquid collecting cup, wherein the volume value is equal to the residual gas amount of the hydrocarbon source rock sample.
9. The method for measuring the residual gas amount of hydrocarbon source rocks according to claim 8, wherein a first valve is arranged on the gas transmission pipe, a second valve is arranged on the liquid transmission pipe, and the gas transmission pipe and the liquid transmission pipe are detachably connected with the liquid tank in a sealing manner;
the method for measuring the residual gas quantity of the hydrocarbon source rock further comprises the following steps:
before the temperature adjusting device is started, closing the first valve and the second valve, and after the hydrocarbon source rock sample reaches the preset temperature, opening the first valve and the second valve;
in the process that the hydrocarbon source rock sample releases gas, the liquid level height of liquid in the liquid tank is monitored at any time, the first valve and the second valve are closed before the liquid level of the liquid in the liquid tank drops to be lower than the top end of the gas conveying pipe or the top end of the liquid conveying pipe, the gas conveying pipe and the liquid conveying pipe are detached and separated from the liquid tank, then the gas conveying pipe and the liquid conveying pipe are connected with a standby liquid tank filled with liquid, and then the first valve and the second valve are opened.
10. A method for measuring the migration gas quantity of source rocks is characterized by comprising the following steps:
determining the residual gas content of the hydrocarbon source rocks by adopting the method for measuring the residual gas content of the hydrocarbon source rocks according to claim 8 or 9;
and subtracting the residual gas amount of the hydrocarbon source rock from the oil-gas resource amount of the hydrocarbon source rock to obtain the migration gas amount of the hydrocarbon source rock.
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