A device for measuring tight gas content on site

Abstract

The present invention discloses an on-site measurement device for tight gas content, comprising: a sampling assembly for constructing a borehole and obtaining a columnar rock sample; a measurement chamber, which is sealed at the orifice of the borehole by an orifice sealing assembly; a measurement tube, one end of which is connected to the measurement chamber, and the other end of which is connected to a suction chamber; a measuring instrument, which is connected in series to the measurement tube and is used to measure the gas flow on the measurement tube; and a positioning and grinding assembly, which slides through one side wall of the measurement chamber and is used to carry the columnar rock sample obtained by the sampling assembly and gradually radially grind it.

Description

Technical Field

[0001] The invention relates to the technical field of gas measurement, in particular to an on-site measurement device for dense gas content. Background Art

[0002] At present, the on-site determination method of tight gas content is often to obtain block rock samples through sampling mechanisms and measure parameters such as porosity to infer the tight gas content in the rock mass. The inferred results sometimes have large errors compared with the actual results.

[0003] Therefore, it is necessary to provide an on-site measurement device for dense gas content to solve the problems raised in the above background technology. Summary of the Invention

[0004] To achieve the above object, the present invention provides the following technical solution: a device for on-site measurement of dense gas content, comprising:

[0005] Sampling assembly, used to construct a borehole and obtain cylindrical rock samples;

[0006] A measuring chamber, which is sealed at the orifice of the drilled hole using an orifice sealing assembly;

[0007] a measuring tube, one end of which is connected to the measuring chamber and the other end of which is connected to the suction chamber;

[0008] a measuring instrument, connected in series to the measuring tube, for measuring the gas flow on the measuring tube; and

[0009] The positioning and grinding component slides through one side wall of the measuring chamber and is used to carry the cylindrical rock sample obtained by the sampling component and grind it radially step by step.

[0010] Furthermore, preferably, a multi-purpose hole is provided through one side wall of the measurement chamber, and the multi-purpose hole is sealed by a plunger.

[0011] Furthermore, as a preference, the positioning and polishing assembly comprises a first plate, a second plate and a third plate distributed in an I-shape, wherein the first plate and the second plate are slidably connected to the third plate;

[0012] A rotator is fixed below the first plate, the rotator having a rotating end, and the rotating end is fixedly connected to a first sealing gasket;

[0013] A telescopic column is fixed above the second plate, the telescopic column having a telescopic end, and the telescopic end is rotatably connected to a second sealing gasket;

[0014] A polishing assembly is fixed on the third plate.

[0015] Furthermore, preferably, the grinding assembly is a belt grinding mechanism, and the grinding length of the belt grinding mechanism is smaller than the length of the columnar rock sample.

[0016] Furthermore, preferably, the sampling assembly includes:

[0017] Multiple threaded drill pipes;

[0018] a drill barrel, which is fixed below the bottommost drill rod;

[0019] a sampling drill bit, which is integrally formed below the drill barrel;

[0020] a rock-breaking drill bit, which is movably disposed in the drill barrel and can rotate synchronously with the drill barrel;

[0021] a cutting hole embedded in the inner wall of the drill barrel and used for ejecting high-pressure cutting fluid; and

[0022] There are at least two positioning holes, which are embedded in the inner wall of the drill tube. Positioning plugs are slidably connected in the positioning holes.

[0023] Furthermore, preferably, a clearance hole is opened on the top of the measuring chamber, which is used to be connected to the drill barrel in a sealing and sliding manner. A sealing frame is connected vertically slidably in the clearance hole, and the sealing frame is used to be connected to the drill rod in a sealing and sliding manner. The cross-section of the sealing frame is T-shaped, and the outer diameter of the drill barrel is larger than the outer diameter of the drill rod.

[0024] Furthermore, as a preference, a drill bit seat is integrally formed above the rock breaking drill bit, the drill bit seat is detachably connected to a connecting seat, and a piston is provided on the outer peripheral side of the connecting seat;

[0025] The drill barrel is communicated with the drill rod.

[0026] Furthermore, preferably, a T-shaped piston rod is fixed on the connecting seat, and the piston rod slides through the drill rod in a limited manner.

[0027] Furthermore, preferably, a sealing ring is fixed to the outer peripheral side of the drill bit seat, and flushing holes are arranged on the surface of the rock breaking drill bit, and the flushing holes are connected to the drill bit seat and the channels inside the rock breaking drill bit.

[0028] Furthermore, preferably, a receiving hole is provided on the surface of the sampling drill bit, a chain is connected to the receiving hole, and the other end of the chain is connected to a reaming drill bit.

[0029] Compared with the prior art, the present invention provides a device for measuring the tight gas content on site, which has the following features:

[0030] Beneficial effects:

[0031] In an embodiment of the present invention, the sampling assembly can construct a borehole and obtain a cylindrical rock sample, and the positioning and grinding assembly can carry the cylindrical rock sample obtained by the sampling assembly and gradually grind it radially. During the grinding process, powder is formed on the surface of the cylindrical rock sample and separates from the cylindrical rock sample, and the gas adsorbed in the cylindrical rock sample escapes with the powder. During this process, the suction chamber always operates at a constant suction power. At the same time, the measuring instrument records the real-time gas flow on the measuring tube and intercepts part of the stable data to calculate the tight gas content of the cylindrical rock sample. The measurement results are relatively stable and accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic structural diagram of a device for on-site measurement of tight gas content;

[0033] Figure 2 This is a schematic diagram of the structure of a sampling assembly in a device for on-site measurement of dense gas content;

[0034] Figure 3 Schematic diagram of an on-site measurement device for dense gas content Figure 1 ;

[0035] Figure 4 Schematic diagram of an on-site measurement device for dense gas content Figure 2 ;

[0036] Figure 5 Schematic diagram of an on-site measurement device for dense gas content Figure 3 ;

[0037] Figure 6 Schematic diagram of an on-site measurement device for dense gas content Figure 4 ;

[0038] In the figure: 1. Measuring chamber; 2. Sealing frame; 3. Orifice sealing assembly; 4. Multi-purpose hole; 5. Measuring tube; 6. Measuring instrument; 7. Suction chamber; 8. Sampling assembly; 9. First plate; 10. First sealing gasket; 11. Second plate; 12. Second sealing gasket; 13. Third plate; 14. Grinding assembly; 81. Drill rod; 82. Drill barrel; 83. Sampling drill bit; 84. Piston rod; 85. Connecting seat; 86. Piston; 87. Drill bit seat; 88. Rock breaking drill bit; 89. Reaming drill bit; 810. Cutting hole; 811. Flushing hole; 812. Sealing ring; 813. Positioning hole. DETAILED DESCRIPTION

[0039] Please refer to Figure 1-6 In an embodiment of the present invention, a device for measuring the tight gas content on site is provided, comprising:

[0040] a sampling assembly 8, for constructing a borehole and obtaining a cylindrical rock sample;

[0041] The measuring chamber 1 is sealed at the orifice of the drilled hole using an orifice sealing assembly 3;

[0042] a measuring tube 5, one end of which is connected to the measuring chamber 1 and the other end of which is connected to the suction chamber 7;

[0043] a measuring instrument 6, connected in series to the measuring tube 5, for measuring the gas flow on the measuring tube 5; and

[0044] The positioning and grinding assembly slides through one side wall of the measuring chamber 1 and is used to carry the cylindrical rock sample obtained by the sampling assembly 8 and grind it radially step by step.

[0045] During implementation, the sampling assembly 8 first constructs a borehole and obtains a cylindrical rock sample. The positioning and grinding assembly then carries the cylindrical rock sample obtained by the sampling assembly 8 and gradually grinds it radially. During the grinding process, powder forms on the surface of the cylindrical rock sample and separates from the cylindrical rock sample. Gas adsorbed in the cylindrical rock sample escapes with the powder. During this process, the suction chamber 7 always operates at a constant suction power. Simultaneously, the measuring instrument 6 records the real-time gas flow on the measuring tube 5 and intercepts some stable data to calculate the tight gas content of the cylindrical rock sample.

[0046] For example, in the t1-t2 stage, the real-time gas flow recorded by the measuring instrument is relatively stable, and its total amount is m liters. Then the grinding amount of the positioning grinding component in the t1-t2 stage can also be obtained through its power. The grinding amount is actually the volume v of the columnar rock sample corresponding to m liters of dense gas. Then the dense gas content of the columnar rock sample is: m liters / m liters of dense gas corresponding to the volume v of the columnar rock sample.

[0047] In order to obtain a columnar rock sample, the sampling assembly 8 in this embodiment must perform both drilling and sampling actions. Specifically, the sampling assembly 8 includes:

[0048] a plurality of threaded drill rods 81;

[0049] a drill barrel 82 fixed below the bottommost drill rod 81;

[0050] a sampling drill bit 83 , which is integrally formed below the drill barrel 82 ;

[0051] a rock breaking drill bit 88 movably disposed in the drill barrel 82 and capable of rotating synchronously with the drill barrel 82;

[0052] a cutting hole 810 embedded in the inner wall of the drill barrel 82 and used for ejecting high-pressure cutting fluid; and

[0053] There are at least two positioning holes 813 embedded in the inner wall of the drill tube 82 , and positioning plugs are slidably connected to the positioning holes.

[0054] The drill rod 81 is driven by an external driving mechanism to perform rotation and axial movement, which will not be described in detail here.

[0055] In this embodiment, the rock-breaking drill bit 88 is movably disposed in the drill barrel 82 and can rotate synchronously with the drill barrel 82. Therefore, when the rock-breaking drill bit 88 extends out of the drill barrel 82, the rock-breaking drill bit 88 plays the role of drilling a hole. Then, when the rock-breaking drill bit 88 is retracted in the drill barrel 82, the sampling drill bit 83 at the bottom of the drill barrel 82 performs sampling drilling. Since the sampling drill bit 83 has an annular structure, it can cut the rock mass during the drilling process and construct part of it into a columnar structure. Thereafter, the columnar rock mass can be cut through the cutting hole 810 to form a columnar rock sample.

[0056] In addition, the positioning hole 813 and the cutting hole 810 can be supplied with liquid through the same pipeline. Since the cutting action of the cutting hole and the action of the positioning plug in the positioning hole are not completed at the same time, the two can be supplied with liquid through the same pipeline. Only the liquid supply pressure needs to be adjusted. The positioning plug can achieve the clamping and positioning of the cylindrical rock sample.

[0057] It should also be noted that during the drilling process using the sampling drill bit 83, it is necessary to discharge the debris. Based on this, the cutting hole 810 in this embodiment also serves as a liquid supply so that the liquid can discharge the debris from the annulus to the orifice position.

[0058] In addition, in this embodiment, a multi-purpose hole 4 is formed through one side wall of the measuring chamber 1 , and the multi-purpose hole 4 is sealed by a plunger.

[0059] The multipurpose hole 4 has multiple functions. When the sampling assembly 8 is used for drilling sampling, a suction pipe is inserted into the multipurpose hole 4 and extends to the hole mouth to suck liquid and debris in the annulus.

[0060] Of course, the multi-purpose hole 4 also has other functions, which will be further introduced below.

[0061] In this embodiment, a drill bit seat 87 is integrally formed above the rock breaking drill bit 88. The drill bit seat 87 is detachably connected to the connecting seat 85. A piston 86 is provided on the outer peripheral side of the connecting seat 85.

[0062] The drill barrel 82 is connected to the drill rod 81 .

[0063] As a preferred embodiment, a T-shaped piston rod 84 is further fixed on the connecting seat 85 , and the piston rod 84 is limitedly slidable and passes through the drill rod 81 .

[0064] During implementation, the piston can be driven to slide downward by injecting water into the drill rod 81, thereby driving the rock-breaking drill bit 88 to extend out of the drill barrel. Of course, in actual implementation, only the drill rod 81 connected to the drill barrel 82 can be injected with water. Specifically, an external water pipe is extended into the drill rod and connected to the drill rod 81 connected to the drill barrel 82. When water is not injected into the drill rod 81, the rock-breaking drill bit will be gradually retracted into the drill barrel under the reaction force of the external rock body.

[0065] In this embodiment, a sealing ring 812 is fixed to the outer peripheral side of the drill bit seat 87, and a flushing hole 811 is arranged on the surface of the rock breaking drill bit 88. The flushing hole is connected to the drill bit seat 87 and the channel inside the rock breaking drill bit 88.

[0066] In this embodiment, a receiving hole is formed on the surface of the sampling drill bit 83 , a chain is connected to the receiving hole, and the other end of the chain is connected to the reaming drill bit 89 .

[0067] It needs to be explained that, since the rock-breaking drill bit can be stored in the drill barrel, the borehole diameter constructed by the rock-breaking drill bit may be unfavorable for the advancement of the drill barrel. Therefore, it is necessary to perform micro-reaming simultaneously during the drilling process of the rock-breaking drill bit. In this embodiment, a receiving hole is provided on the surface of the sampling drill bit 83, and a chain is connected to the receiving hole. The other end of the chain is connected to a reaming drill bit 89. The diameter of the borehole can be expanded by the chain and the reaming drill bit 89, and the chain can also be stored in the drill barrel.

[0068] In this embodiment, the positioning and polishing assembly includes a first plate 9, a second plate 11, and a third plate 13 distributed in an I-shape, wherein the first plate 9 and the second plate 11 are slidably connected to the third plate 13;

[0069] A rotator is fixed below the first plate 9, and the rotator has a rotating end, and the rotating end is fixedly connected to the first sealing gasket 10;

[0070] A telescopic column is fixed above the second plate 11, and the telescopic column has a telescopic end, and the telescopic end is rotatably connected to the second sealing gasket 12;

[0071] A polishing assembly 14 is fixed on the third plate 13 .

[0072] It should be explained that the sliding movement of the first plate body, the sliding movement of the second plate body, and the sliding movement of the third plate body are respectively driven by an external displacement mechanism, which includes a cylinder, a hydraulic cylinder, an electric telescopic rod, a screw-nut pair mechanism, etc., which will not be described in detail here;

[0073] When implementing, Figure 3-6 , Figure 3 Schematic diagram of an on-site measurement device for dense gas content Figure 1 ; Figure 4 Schematic diagram of an on-site measurement device for dense gas content Figure 2 ; Figure 5 Schematic diagram of an on-site measurement device for dense gas content Figure 3 ; Figure 6 Schematic diagram of an on-site measurement device for dense gas content Figure 4 Specifically,

[0074] Figure 3 This is a diagram of the state of the sampling assembly 8 after obtaining a cylindrical rock sample. At this time, the flexible nozzle is lowered through the multi-purpose hole 4, and the expansion sealing liquid is sprayed toward the borehole opening through the flexible nozzle to temporarily seal the borehole opening;

[0075] Figure 4 This is a diagram showing the state after the external displacement mechanism drives the second plate to move. At this time, the positioning plug releases the clamping of the cylindrical rock sample. Under the action of gravity, the cylindrical rock sample naturally falls onto the second sealing gasket 12.

[0076] Since the distance between the cylindrical rock sample in the sampling assembly 8 and the second sealing gasket 12 is relatively close, when the cylindrical rock sample falls onto the second sealing gasket 12, it can be held on the second sealing gasket 12 in a relatively stable posture. Of course, in order to improve the stability of the cylindrical rock sample after falling, the structure of the second sealing gasket 12 can be further optimized, for example, by constructing it into a groove-shaped structure, etc., which will not be described in detail here.

[0077] More importantly, a telescopic column is provided below the second sealing gasket 12 , and the telescopic adjustment performed by the telescopic column can further reduce the distance between the columnar rock sample in the sampling assembly 8 and the second sealing gasket 12 .

[0078] Figure 5 This is a diagram showing the state after the external displacement mechanism drives the first plate to move. At this time, the first sealing gasket 10 is located above the cylindrical rock sample. At this time, the telescopic adjustment of the telescopic column can enable the first sealing gasket 10 to be pressed against the top of the cylindrical rock sample, so that when the first sealing gasket 10 rotates, it can drive the cylindrical rock sample to rotate synchronously;

[0079] Figure 6 This is a state diagram after the external displacement mechanism drives the third plate to move. At this time, the grinding assembly 14 can be gradually fed and ground by gradually feeding the third plate. During this process, the columnar rock sample continues to rotate.

[0080] In this embodiment, the grinding assembly 14 is a belt grinding mechanism, and the grinding length of the belt grinding mechanism is shorter than the length of the columnar rock sample to prevent interference between the belt grinding mechanism and the first sealing gasket and the second sealing gasket.

[0081] As a preferred embodiment, a clearance hole is opened on the top of the measuring chamber 1, which is used to be sealed and slidably connected to the drill barrel 82. A sealing frame 2 is connected vertically slidably in the clearance hole. The sealing frame 2 is used to be sealed and slidably connected to the drill rod 81. The cross-section of the sealing frame 2 is T-shaped, and the outer diameter of the drill barrel 82 is larger than the outer diameter of the drill rod 81.

[0082] The above is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A device for measuring tight gas content on site, characterized in that: include: a sampling assembly (8) for constructing a borehole and obtaining a cylindrical rock sample; A measuring chamber (1) is sealed at the orifice of the drilled hole using an orifice sealing assembly (3); a measuring tube (5), one end of which is connected to the measuring chamber (1) and the other end of which is connected to the suction chamber (7); a measuring instrument (6), connected in series to the measuring tube (5), for measuring the gas flow on the measuring tube (5); A positioning and grinding assembly, which slides through a side wall of the measuring chamber (1) and is used to carry the cylindrical rock sample obtained by the sampling assembly (8) and gradually radially grind it; The positioning and polishing assembly comprises a first plate (9), a second plate (11) and a third plate (13) which are arranged in an I-shape, wherein the first plate (9) and the second plate (11) are slidably connected to the third plate (13); A rotator is fixed below the first plate (9), the rotator having a rotating end, and the rotating end is fixedly connected to a first sealing gasket (10); A telescopic column is fixed above the second plate (11), the telescopic column having a telescopic end, and the telescopic end is rotatably connected to a second sealing gasket (12); A grinding assembly (14) is fixed on the third plate (13); The sampling assembly (8) comprises: a plurality of threaded drill rods (81); a drill barrel (82) fixed below the bottommost drill rod (81); a sampling drill bit (83) integrally formed below the drill barrel (82); a rock-breaking drill bit (88) which is movably disposed in the drill barrel (82) and can rotate synchronously with the drill barrel (82); a cutting hole (810) embedded in the inner wall of the drill tube (82) and used for spraying high-pressure cutting fluid; There are at least two positioning holes (813) embedded in the inner wall of the drill tube (82), with positioning plugs slidably connected to the positioning holes; A clearance hole is provided on the top of the measuring chamber (1) for sealing and sliding connection with the drill tube (82); a sealing frame (2) is vertically slidably connected in the clearance hole; the sealing frame (2) is used for sealing and sliding connection with the drill rod (81); the cross section of the sealing frame (2) is T-shaped; the outer diameter of the drill tube (82) is larger than the outer diameter of the drill rod (81).

2. The on-site measurement device for dense gas content according to claim 1, characterized in that: A multi-purpose hole (4) is provided through one side wall of the measuring chamber (1), and the multi-purpose hole (4) is sealed by a plunger.

3. The on-site measurement device for dense gas content according to claim 1, characterized in that: The grinding assembly (14) is a belt-type grinding mechanism, and the grinding length of the belt-type grinding mechanism is smaller than the length of the columnar rock sample.

4. The on-site measurement device for dense gas content according to claim 1, characterized in that: A drill bit seat (87) is integrally formed above the rock-breaking drill bit (88), and the drill bit seat (87) is detachably connected to the connecting seat (85). A piston (86) is provided on the outer peripheral side of the connecting seat (85); The drill barrel (82) is communicated with the drill rod (81).

5. The on-site measurement device for dense gas content according to claim 4, characterized in that: A T-shaped piston rod (84) is also fixed on the connecting seat (85), and the piston rod (84) is limitedly slidable and passes through the drill rod (81).

6. The on-site measurement device for dense gas content according to claim 4, characterized in that: A sealing ring (812) is fixed on the outer peripheral side of the drill bit seat (87), and a flushing hole (811) is arranged on the surface of the rock breaking drill bit (88). The flushing hole is connected to the drill bit seat (87) and the channel inside the rock breaking drill bit (88).

7. The on-site measurement device for dense gas content according to claim 1, characterized in that: A receiving hole is provided on the surface of the sampling drill bit (83), a chain is connected to the receiving hole, and the other end of the chain is connected to a reaming drill bit (89).

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