Sampling device for shale oil reservoir exploitation

Abstract

The utility model discloses a sampling device for shale oil reservoir exploitation, which comprises a gas transmission assembly, a first sealing assembly, a sample tank and a second sealing assembly, and the gas transmission assembly is used for pumping out air in a sampling area and carrying out negative pressure sampling; the first sealing assembly and the second sealing assembly are used for sealing the boundary of a sampling area; the second sealing assembly comprises a flow guide ring, a flow collecting groove and a flow guide hole, and the flow guide ring is used for conducting flow guide on the sampled oil reservoir and is matched with the flow guide hole to suck the oil reservoir into a sample tank. The negative pressure sampling mode is adopted, more visual and accurate oil reservoir reserves data can be obtained, the working steps of sampling are simplified, and the efficiency of oil reservoir exploration sampling is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of oil reservoir exploration, in particular to a sampling device for shale oil reservoir development. Background Art

[0002] Shale oil is an unconventional oil resource. Conventional oil is formed by the transformation of ancient biological remains under high temperature and high pressure conditions over millions of years. It is generally stored in rock formations with large pores and strong permeability. It can flow freely and gather together to form a large natural oil reservoir. Shale oil, on the other hand, is stored in shale layers with small pores and low permeability. The dense, hard and sticky environment traps shale oil in tiny pores and makes it difficult to flow freely, making it difficult to mine.

[0003] Secondly, the special distribution pattern of shale oil reservoirs also brings certain difficulties to the sampling and exploration of oil reservoir reserves. The existing sampling and exploration methods of shale oil reservoirs mostly use drilling to take core samples, and then grind the cores to separate the oil droplets and estimate them to obtain the oil reservoir reserve data of the area.

[0004] However, the oil reservoir reserve data obtained by the above sampling method is not representative. Due to the special properties of shale oil reservoirs, the fluidity of shale oil is poor, resulting in uneven distribution of oil reservoirs in shale areas. Therefore, the oil reservoir reserve data obtained by the above sampling, separation, and estimation methods are not accurate enough, which can easily cause exploration deviations and affect subsequent mining operations. Utility Model Content

[0005] The utility model aims to provide a sampling device for shale oil reservoir development to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a sampling device for shale oil reservoir development, comprising a gas transmission component, a first sealing component, a sample tank and a second sealing component;

[0007] The first sealing assembly and the second sealing assembly are installed at two ends of the sample tank;

[0008] The gas delivery assembly includes a negative pressure pipe, a connecting pipe and a plug, wherein the negative pressure pipe is installed inside the first sealing assembly and the negative pressure pipe is communicated with the connecting pipe, and the plug is installed inside the second sealing assembly;

[0009] The first sealing assembly and the second sealing assembly are respectively installed at two ends of the connecting pipe, and a gas valve is installed on the pipe wall of the connecting pipe;

[0010] The second sealing assembly includes a guide ring, a collecting groove and a guide hole;

[0011] The collecting groove is located at the top edge of the second sealing component, the two ends of the guide hole are respectively connected to the inside of the collecting groove and the top surface of the second sealing component, the guide ring is arranged on the surface of the second sealing component, and a one-way valve is installed at the top opening of the guide hole.

[0012] Preferably, the number of the guide holes is one or more.

[0013] Preferably, the number of the gas valves is one or more.

[0014] Preferably, the first sealing assembly includes a first connecting seat, a first limiting plate, a first airbag, a first sealing sleeve and a first expansion sleeve;

[0015] The two side surfaces of the first airbag are respectively connected to the surfaces of the first connecting seat and the first limiting plate, the first expansion sleeve is arranged between the first airbag and the first sealing sleeve, and the inner wall of the first connecting seat is provided with a first air hole connected to the inside of the first airbag.

[0016] Preferably, the second sealing assembly includes a second connecting seat, a second limiting plate, a second airbag, a second sealing sleeve and a second expansion sleeve;

[0017] The two side surfaces of the second airbag are respectively connected to the surfaces of the second connecting seat and the second limiting plate, the second expansion sleeve is arranged between the second airbag and the second sealing sleeve, and the inner wall of the second connecting seat is provided with a second air hole connected to the inside of the second airbag;

[0018] The guide ring is installed on the surface of the second sealing sleeve, and the outer wall diameter of the guide ring is larger than the surface diameter of the second sealing sleeve.

[0019] Preferably, the number of the first pores is one or more.

[0020] Preferably, the number of the second air holes is one or more.

[0021] Preferably, the first airbag, the second airbag, the first sealing sleeve and the second sealing sleeve are all made of rubber.

[0022] Preferably, the first expansion sleeve and the second expansion sleeve are made of stainless steel.

[0023] Preferably, a filter screen is provided inside the opening of the collecting tank.

[0024] Compared with the prior art, the beneficial effects of the utility model are:

[0025] 1. The utility model achieves the effect of sealing both ends of the sampling area and diverting the shale oil reservoir by setting the first sealing component and the second sealing component. The first sealing component and the second sealing component can seal the gap between the sampling device and the well wall through the expansion of the sealing sleeve to maintain the airtightness of the sampling area.

[0026] 2. The utility model achieves the effect of negative pressure sampling in the sampling area by setting up a gas transmission component. After the boundary of the sampling area is sealed by cooperating with the first sealing component and the second sealing component, the air in the sampling area is extracted through the gas transmission component to form a negative pressure in the sampling area, and the oil reservoir in the shale in the sampling area is sucked into the sample tank. The obtained oil reservoir samples do not need additional processing, and can reflect the oil reservoir reserves in the shale around the sampling area, and the obtained oil reservoir reserve data is more intuitive and representative. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the exploded structure of the components of the utility model;

[0028] Figure 2 This is a schematic diagram of the appearance structure of the utility model;

[0029] Figure 3 This is a schematic diagram of the main cross-sectional structure of the utility model;

[0030] Figure 4 This is a schematic diagram of the exploded structure of the first sealing component parts of the utility model;

[0031] Figure 5 It is a partial cross-sectional structural schematic diagram of the first sealing component of the utility model;

[0032] Figure 6 This is a schematic diagram of the exploded structure of the second sealing component parts of the utility model;

[0033] Figure 7 For the utility model Figure 6 The enlarged schematic diagram at A in the middle;

[0034] Figure 8 It is a partial cross-sectional structural schematic diagram of the second sealing component of the utility model;

[0035] Fig. 9 For the utility model Figure 8 The enlarged schematic diagram of point B in the middle;

[0036] Fig.10 It is a schematic diagram of the sealing state structure of the second sealing component of the utility model.

[0037] In the figure:

[0038] 100, gas transmission assembly; 110, negative pressure pipe; 120, connecting pipe; 121, gas valve; 130, plug;

[0039] 200, first sealing assembly; 210, first connecting seat; 211, first air hole; 220, first limiting plate; 230, first air bag; 240, first sealing sleeve; 250, first expansion sleeve;

[0040] 300. Sample can;

[0041] 400, second sealing assembly; 410, second connecting seat; 411, second air hole; 420, second limit plate; 430, second air bag; 440, second sealing sleeve; 450, second expansion sleeve; 460, guide ring; 470, collecting groove; 471, filter screen; 480, guide hole; 490, one-way valve;

[0042] 500. Well wall. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0044] See also Figures 1 to 10 , an embodiment provided by the utility model:

[0045] See also Figure 1 and Figure 2 A sampling device for shale oil reservoir development includes a gas transmission component 100, a first sealing component 200, a sample tank 300 and a second sealing component 400.

[0046] See also Figures 3 to 5 The first sealing assembly 200 includes a first connecting seat 210, a first limiting plate 220, a first airbag 230, a first sealing sleeve 240 and a first expansion sleeve 250.

[0047] The two side surfaces of the first airbag 230 are respectively connected to the surfaces of the first connecting seat 210 and the first limiting plate 220. The first expansion sleeve 250 is arranged between the first airbag 230 and the first sealing sleeve 240. The inner wall of the first connecting seat 210 is provided with a plurality of first air holes 211 connected to the interior of the first airbag 230.

[0048] It is worth noting that the number of the first air holes 211 is one or more. Specifically, the number of the first air holes 211 is eight, which is used to increase the gas flow speed.

[0049] It is worth noting that the first airbag 230 and the first sealing sleeve 240 are both made of rubber, and the first expansion sleeve 250 is made of stainless steel.

[0050] See also Figures 6 to 9 The second sealing assembly 400 includes a second connecting seat 410 , a second limiting plate 420 , a second airbag 430 , a second sealing sleeve 440 , a second expansion sleeve 450 , a guide ring 460 , a collecting groove 470 and a guide hole 480 .

[0051] It is worth noting that the number of the guide holes 480 is one or more, and specifically, the number of the guide holes 480 is eight.

[0052] The two side surfaces of the second airbag 430 are respectively connected to the surfaces of the second connecting seat 410 and the second limiting plate 420. The second expansion sleeve 450 is arranged between the second airbag 430 and the second sealing sleeve 440. The inner wall of the second connecting seat 410 is provided with a plurality of second air holes 411 connected to the interior of the second airbag 430.

[0053] It is worth noting that the number of the second air holes 411 is one or more. Specifically, the number of the second air holes 411 is eight, which is used to increase the gas flow speed.

[0054] The collecting groove 470 is located at the top edge of the second sealing component 400, and the two ends of the guide hole 480 are respectively connected to the inside of the collecting groove 470 and the top surface of the second sealing component 400. The guide ring 460 is arranged on the surface of the second sealing component 400. A one-way valve 490 is installed at the top opening of the guide hole 480, and the output port of the one-way valve 490 is located in the sample tank 300.

[0055] It is worth noting that the second airbag 430 and the second sealing sleeve 440 are both made of rubber, and the second expansion sleeve 450 is made of stainless steel.

[0056] It is worth noting that a filter screen 471 is provided inside the opening of the collecting trough 470 , and the filter screen 471 is used to protect the opening of the collecting trough 470 to prevent sand and gravel falling from the well wall 500 from clogging the guide hole 480 .

[0057] See also Figure 1 The first sealing assembly 200 and the second sealing assembly 400 are rotatably mounted on both ends of the sample tank 300. The first sealing assembly 200 and the second sealing assembly 400 are used to seal the two end areas of the sample tank 300 to ensure the effect of negative pressure sampling.

[0058] See also Figure 3The gas delivery component 100 includes a negative pressure tube 110, a connecting tube 120 and a plug 130. The negative pressure tube 110 is installed inside the first sealing component 200, and the negative pressure tube 110 is connected to the connecting tube 120. The plug 130 is installed inside the second sealing component 400.

[0059] The first sealing assembly 200 and the second sealing assembly 400 are respectively installed at both ends of the connecting pipe 120. The pipe wall of the connecting pipe 120 is installed with a gas valve 121. The number of the gas valve 121 is one or more. Specifically, the number of the gas valve 121 is four, which is used to increase the gas flow speed.

[0060] It is worth noting that the gas valve 121 is a pressure differential opening and closing valve, which is a valve that uses pressure difference to control opening and closing.

[0061] Specifically, the air valve 121 is used to adjust the air pressure difference between the first airbag 230, the second airbag 430 and the sample tank 300. When the air delivery component 100 outputs air, the air inside the first airbag 230 and the second airbag 430 is preferentially extracted, so that the first sealing sleeve 240 and the second sealing sleeve 440 expand and seal the sampling area.

[0062] As the negative pressure increases, the pressure difference between the inside of the connecting tube 120 and the sample tank 300 gradually increases. The valve plate inside the air valve 121 opens under the push of the pressure difference, connecting the space in the sample tank 300 with the inside of the connecting tube 120, and then the air in the sample tank 300 is extracted to form a negative pressure in the sample tank 300. The air valve 121 plays a role in regulating the order of the negative pressure formation areas.

[0063] Specifically, when the negative pressure tube 110 outputs air, since the connecting tube 120 is respectively connected to the first sealing component 200 and the second sealing component 400, negative pressure is generated in the connecting tube 120. The connecting tube 120 can be connected to the first airbag 230 through the first air hole 211, and the gas in the first airbag 230 can be extracted by the negative pressure, thereby shrinking the internal space of the first airbag 230.

[0064] It is worth noting that during the contraction of the first airbag 230, the volume of the internal space of the first airbag 230 is reduced, which can drive the first limiting plate 220 to move toward the first connecting seat 210, resulting in a reduction in the distance between the first limiting plate 220 and the first connecting seat 210, prompting the first expansion sleeve 250 to produce longitudinal contraction, thereby increasing the diameter of the arc surface of the first expansion sleeve 250 and increasing the outer wall diameter of the first expansion sleeve 250.

[0065] During the expansion of the outer wall of the first expansion sleeve 250 , the first expansion sleeve 250 drives the first sealing sleeve 240 to expand elastically, increasing the outer wall diameter of the first sealing sleeve 240 , thereby achieving the effect of contacting and sealing the well wall 500 through the first sealing sleeve 240 .

[0066] It is worth noting that during the contraction of the first sealing assembly 200, the second sealing assembly 400 also contracts synchronously. Specifically, the connecting tube 120 connects the connecting tube 120 with the second airbag 430 through the second air hole 411, and the gas in the second airbag 430 is extracted by negative pressure, thereby contracting the internal space of the second airbag 430.

[0067] The internal space volume of the second airbag 430 is reduced, which can drive the second limiting plate 420 to move toward the second connecting seat 410, resulting in a reduction in the distance between the second limiting plate 420 and the second connecting seat 410, prompting the second expansion sleeve 450 to produce longitudinal contraction, thereby increasing the diameter of the arc surface of the second expansion sleeve 450 and increasing the outer wall diameter of the second expansion sleeve 450.

[0068] During the expansion of the outer wall of the second expansion sleeve 450 , the second expansion sleeve 450 drives the second sealing sleeve 440 to expand elastically, increasing the outer wall diameter of the second sealing sleeve 440 , thereby achieving the effect of contact and sealing between the second sealing sleeve 440 and the well wall 500 .

[0069] Specifically, when the air in the sample tank 300 is extracted, the internal space of the sample tank 300 is connected to the external space of the sample tank 300 through the guide hole 480 and the collecting groove 470. That is, when the air in the internal space of the sample tank 300 is extracted, the air in the internal and external spaces of the sample tank 300 is actually extracted together, so that all the air in the sampling space between the first sealing component 200 and the second sealing component 400 is extracted, and a negative pressure is formed in the sampling space.

[0070] See also Fig.10 During the expansion and sealing process of the second sealing assembly 400, the outer wall diameter of the second sealing sleeve 440 expands, driving the guide ring 460 to fit along the well wall 500. At the same time, the guide ring 460 is squeezed and deformed, and the surface of the guide ring 460 produces a slope facing the collecting groove 470. The oil reservoir sucked out by the negative pressure in the sampling space flows along the well wall 500 to the surface of the guide ring 460, and enters the guide hole 480 through the filter 471. As the negative pressure pipe 110 continues to apply negative pressure, the oil reservoir passes through the guide hole 480 through the one-way valve 490 and enters the internal space of the sample tank 300, achieving the effect of collecting the oil reservoir.

[0071] It is worth noting that the exploration well is soaked and internally heated before sampling. Smoothing means plugging the wellhead of the exploration well to allow the fracturing oil to stay in the oil layer, breaking up the oil layer through the fracturing oil and increasing the permeability of the oil layer. Secondly, the combustible gas remaining in the exploration well can be used as fuel. The combustible gas is ignited and burned in the exploration well to heat the well wall 500, and the fluidity of the reservoir is increased by heating.

[0072] After the well wall 500 is soaked and burned, the internal temperature of the well wall 500 and the shale cracks increase, and the heat generated after the combustion diffuses along the well wall 500, resulting in an increase in the fluidity of the shale oil reservoir in the area around the well wall 500. Then, through negative pressure absorption, the oil reservoir flows into the sampling space along the shale cracks, and the oil reservoir flows along the well wall 500 to the guide ring 460, and flows along the surface of the guide ring 460 to the collecting groove 470. With the continuous air output of the negative pressure pipe 110, the negative pressure pressure in the connecting pipe 120 is always kept greater than the negative pressure pressure in the sample tank 300, so as to achieve the effect of sucking the oil reservoir in the collecting groove 470 into the sample tank 300 through the guide hole 480 through negative pressure absorption.

[0073] The oil reservoir is collected at the bottom of the sample tank 300. Due to the presence of the one-way valve 490, the oil reservoir and the air flow cannot flow in the reverse direction, that is, the oil reservoir volume obtained in the sample tank 300 represents the oil reservoir reserves in the shale in the space around the sampling area.

[0074] Working principle:

[0075] Before taking samples, the staff ignites the combustible gas in the well, increases the temperature inside the well wall 500 through combustion, and then simmers the well so that the heat generated by the combustion diffuses along the well wall 500 to the shale in the surrounding area, thereby increasing the fluidity of the oil reservoir in the shale.

[0076] Subsequently, the sampling device is placed in the well wall 500, and the length of the negative pressure tube 110 is controlled to control the sampling position of the sampling device. After reaching the predetermined sampling position, the negative pressure tube 110 outputs the air. Since the connecting tube 120 is respectively connected to the first sealing component 200 and the second sealing component 400, negative pressure is generated in the connecting tube 120, which can be connected to the first airbag 230 and the second airbag 430 through the first air hole 211 and the second air hole 411 respectively. The gas in the first airbag 230 and the second airbag 430 is extracted by the negative pressure, thereby shrinking the internal space of the first airbag 230 and the second airbag 430.

[0077] During the contraction of the first airbag 230 and the second airbag 430, the internal space volume of the first airbag 230 and the second airbag 430 is reduced, which can simultaneously drive the first limiting plate 220 to move toward the first connecting seat 210 and the second limiting plate 420 to move toward the second connecting seat 410, causing the first expansion sleeve 250 and the second expansion sleeve 450 to produce longitudinal contraction, so that the diameter of the arc surface of the first expansion sleeve 250 and the second expansion sleeve 450 increases, resulting in radial size expansion.

[0078] Furthermore, during the expansion of the outer walls of the first expansion sleeve 250 and the second expansion sleeve 450, the first sealing sleeve 240 and the second sealing sleeve 440 expand elastically, thereby increasing the outer wall diameters of the first sealing sleeve 240 and the second sealing sleeve 440, thereby achieving the effect of contacting and sealing the well wall 500 through the first sealing sleeve 240 and the second sealing sleeve 440.

[0079] When the air in the sample tank 300 is extracted, the internal space of the sample tank 300 is connected with the external space of the sample tank 300 through the guide hole 480 and the collecting groove 470. That is, when the air in the internal space of the sample tank 300 is extracted, the air in the internal and external spaces of the sample tank 300 is actually extracted together, so that all the air in the sampling space between the first sealing component 200 and the second sealing component 400 is extracted, and a negative pressure is formed in the sampling space.

[0080] Before sampling, the exploration personnel will carry out well-sealing and combustible gas combustion operations in the exploration well. Well-sealing refers to sealing the wellhead of the exploration well to allow the fracturing oil to stay in the oil layer, breaking up the oil layer through the fracturing oil and increasing the permeability of the oil layer. Secondly, the combustible gas remaining in the exploration well can be used as fuel. The combustible gas is ignited and burned in the exploration well to heat the well wall 500, thereby increasing the fluidity of the reservoir by heating.

[0081] After the wellbore 500 is soaked and burned, the internal temperature of the wellbore 500 and the shale cracks increase. The temperature generated after the combustion diffuses along the wellbore 500, resulting in an increase in the fluidity of the shale oil reservoir in the area around the wellbore 500. Then, the oil reservoir flows into the sampling space along the shale cracks by negative pressure absorption. The oil reservoir flows along the wellbore 500 to the guide ring 460, and flows along the surface of the guide ring 460 to the collecting groove 470. With the continuous air output of the negative pressure pipe 110, the negative pressure pressure in the connecting pipe 120 is always kept greater than the negative pressure pressure in the sample tank 300, so that the oil reservoir in the collecting groove 470 is sucked into the sample tank 300 through the guide hole 480 by negative pressure absorption. The oil reservoir gathers at the bottom of the sample tank 300. Due to the existence of the one-way valve 490, the oil reservoir and the airflow cannot flow in reverse, that is, the oil reservoir volume obtained in the sample tank 300 represents the oil reservoir reserves in the shale in the space around the sampling area.

[0082] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A sampling device for shale oil reservoir development, characterized in that: It comprises a gas transmission component (100), a first sealing component (200), a sample tank (300) and a second sealing component (400); The first sealing assembly (200) and the second sealing assembly (400) are installed at two ends of the sample tank (300); The gas transmission assembly (100) comprises a negative pressure tube (110), a connecting tube (120) and a plug (130); the negative pressure tube (110) is installed inside the first sealing assembly (200), and the negative pressure tube (110) is connected to the connecting tube (120); and the plug (130) is installed inside the second sealing assembly (400); The first sealing assembly (200) and the second sealing assembly (400) are respectively installed at two ends of the connecting pipe (120), and a gas valve (121) is installed on the pipe wall of the connecting pipe (120); The second sealing assembly (400) comprises a flow guide ring (460), a flow collecting groove (470) and a flow guide hole (480); The collecting groove (470) is located at the top edge of the second sealing component (400), and the two ends of the guide hole (480) are respectively connected to the inside of the collecting groove (470) and the top surface of the second sealing component (400), the guide ring (460) is arranged on the surface of the second sealing component (400), and a one-way valve (490) is installed at the top opening of the guide hole (480).

2. A sampling device for shale oil reservoir development according to claim 1, characterized in that: The number of the guide holes (480) is one or more.

3. A sampling device for shale oil reservoir development according to claim 1, characterized in that: The number of the gas valve (121) is one or more.

4. A sampling device for shale oil reservoir development according to claim 1, characterized in that: The first sealing assembly (200) comprises a first connecting seat (210), a first limiting plate (220), a first airbag (230), a first sealing sleeve (240) and a first expansion sleeve (250); The two side surfaces of the first airbag (230) are respectively connected to the surfaces of the first connecting seat (210) and the first limiting plate (220); the first expansion sleeve (250) is arranged between the first airbag (230) and the first sealing sleeve (240); and the inner wall of the first connecting seat (210) is provided with a first air hole (211) which is connected to the interior of the first airbag (230).

5. A sampling device for shale oil reservoir development according to claim 4, characterized in that: The second sealing assembly (400) comprises a second connecting seat (410), a second limiting plate (420), a second airbag (430), a second sealing sleeve (440) and a second expansion sleeve (450); The two side surfaces of the second airbag (430) are respectively connected to the surfaces of the second connecting seat (410) and the second limiting plate (420); the second expansion sleeve (450) is arranged between the second airbag (430) and the second sealing sleeve (440); and the inner wall of the second connecting seat (410) is provided with a second air hole (411) which is connected to the interior of the second airbag (430); The guide ring (460) is mounted on the surface of the second sealing sleeve (440), and the outer wall diameter of the guide ring (460) is greater than the surface diameter of the second sealing sleeve (440).

6. A sampling device for shale oil reservoir development according to claim 5, characterized in that: The number of the first air holes (211) is one or more.

7. A sampling device for shale oil reservoir development according to claim 6, characterized in that: The number of the second air holes (411) is one or more.

8. The sampling device for shale oil reservoir development according to claim 5, characterized in that: The first airbag (230), the second airbag (430), the first sealing sleeve (240), and the second sealing sleeve (440) are all made of rubber.

9. The sampling device for shale oil reservoir development according to claim 5, characterized in that: The first expansion sleeve (250) and the second expansion sleeve (450) are made of stainless steel.

10. The sampling device for shale oil reservoir development according to claim 5, characterized in that: A filter screen (471) is provided inside the opening of the collecting tank (470).

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