A rapid identification device and method for oil and gas-bearing sections in rock cores

Abstract

This invention relates to the field of oil and gas exploration and development technology, and discloses a device and method for rapid identification of oil and gas-bearing sections in core samples. The device includes a core holder for holding the core; a core holder opening and closing controller located on the second side of the core holder; and a gas transmission pipe for transmitting gas to a pump-suction hydrocarbon gas detector. The method involves cleaning the surface of the core; placing the core into the core holder through an opening, with the core holder clamping the core; and activating the pump-suction hydrocarbon gas detector to draw in and detect the gas released from the core. This technical solution, by using a core holder to enclose a section of shale core that has just emerged from the core, allows the pump-suction hydrocarbon gas detector to draw in the gas released from the core, enabling rapid identification of high-oil-bearing sections in a short time. This significantly shortens sampling time, effectively avoids the large-scale loss of light hydrocarbons, and provides accurate test data for evaluating the oil and gas content of shale.

Description

Technical Field

[0001] This invention relates to the field of oil and gas exploration and development technology, specifically to a device and method for rapid identification of oil and gas-bearing sections in rock cores. Background Technology

[0002] Shale reservoirs exhibit strong heterogeneity, with significant differences in their hydrocarbon content; furthermore, light hydrocarbons in shale samples are easily lost. The higher the hydrocarbon content of shale, the greater the loss. Therefore, minimizing the storage time between core extraction and hydrocarbon content determination is crucial for accurate measurement of shale hydrocarbon content. Rapid identification of hydrocarbon-bearing zones is therefore essential. Currently, two common techniques for identifying hydrocarbon-bearing zones are: First, using a fluorescence logging instrument to quantitatively detect the fluorescence intensity of petroleum in the sample, and using oil from the same layer in adjacent wells as a calibration to calculate the equivalent oil content; the hydrocarbon content and quality are then used to determine the shale core's hydrocarbon content for sample selection. Second, a shale core immersion test is conducted. Freshly extracted shale cores are cleaned of mud and then placed in clean water. The escaping of shale gas from the core surface, forming bubbles, is observed to determine the gas content of the shale zone, facilitating the selection of gas-bearing test samples.

[0003] Both of the above methods require a considerable amount of time (several minutes or even half an hour) to transfer shale cores; they fail to identify oil and gas-bearing strata in the first instance, resulting in a significant loss of light hydrocarbons in the cores. To address the shortcomings of these methods, this invention focuses on the speed and convenience of identifying oil and gas-bearing strata, and designs a handheld device and method for rapid sample selection for testing the oil and gas content of cores, to meet the needs of oil and gas exploration and development. Summary of the Invention

[0004] This application provides a device and method for rapid identification of oil and gas-bearing sections in core samples, in order to solve the aforementioned technical problem of significant loss of light hydrocarbons in the identification of oil and gas-bearing sections in existing technologies.

[0005] According to one aspect of this application, one embodiment provides a rapid identification device for oil and gas-bearing sections in core samples, comprising:

[0006] A core holder, wherein the first side of the core holder is provided with an opening, and the core holder is used to hold a core.

[0007] A core clamp opening and closing controller is disposed on the second side of the core clamp holder;

[0008] and

[0009] A gas transmission pipe, the first end of which is connected to a pump-suction hydrocarbon gas detector; the second end of which extends into a core holder for transmitting gas lost from the core to the pump-suction hydrocarbon gas detector.

[0010] In one embodiment, the core holder includes an openable core clamp; a sealing ring is fixed to the surface of the core clamp that holds the core; the sealing ring is used to wrap the core.

[0011] In one embodiment, the sealing ring is an oil-resistant and wear-resistant rubber sealing ring.

[0012] In one embodiment, the core clip is arc-shaped, and the concave portion of the core clip is used to wrap the arc-shaped surface of the core.

[0013] In one embodiment, the core clamp extends outward on the second side of the core holder to form a core clamp extension piece; the core clamp extension piece is connected to the core clamp opening and closing controller.

[0014] In one embodiment, the core clamp opening and closing controller includes a spring connected between two core clamp extensions; the spring is compressed to clamp the core.

[0015] In one embodiment, a filter for filtering mud from the core surface is provided on the core holder at the position corresponding to the second end of the gas transmission pipe; the filter is filled with a removable paper or sponge filter element.

[0016] In one embodiment, the pump-suction hydrocarbon gas detector includes a hydrocarbon gas detection body and a suction pump connected to the hydrocarbon gas detection body; the hydrocarbon gas detection body is provided with a detection module for hydrocarbon gas detection.

[0017] According to one aspect of this application, one embodiment provides a method for rapid identification of oil and gas-bearing sections in cores based on the rapid identification device for oil and gas-bearing sections in cores described in any one of the above claims, comprising the following steps:

[0018] S1. Clean the surface of the core sample;

[0019] S2. Insert the core into the core holder through the opening, and the core holder clamps the core.

[0020] S3. Start the pump-type hydrocarbon gas detector to draw in the gas released from the core for detection.

[0021] In one embodiment, a new filter element is used for each gas detection by the pump-type hydrocarbon gas detector.

[0022] The rapid identification device and method for hydrocarbon-bearing sections in cores described in the above embodiments use a core holder to attach and wrap a section of shale core that has just emerged from the core. A highly sensitive pump-type hydrocarbon gas detector draws in the gas lost from the core, and the high-oil-bearing section can be quickly identified in the first instance. This provides a convenient and rapid basis for sampling for testing the hydrocarbon-bearing properties of shale, greatly shortening the sampling time and effectively avoiding the loss of large amounts of light hydrocarbons, thus providing accurate test data for evaluating the hydrocarbon-bearing properties of shale. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of a rapid identification device for oil and gas-bearing sections in a core sample according to one embodiment of this application; at this time, the core holder is in a closed state;

[0024] Figure 2 This is a three-dimensional structural schematic diagram (perspective view) of a rapid identification device for oil and gas-bearing sections in a core sample according to one embodiment of this application; at this time, the core holder is in the open state;

[0025] Figure label:

[0026] 101-Operating handle, 102-Connecting cable, 103-Pump-type hydrocarbon gas detector, 104-Gas transmission pipe, 105-Core clamp opening and closing controller, 106-Filter, 107-Core clamp holder, 201-Core clamp, 202-Sealing ring, 203-Core clamp extension piece, 204-Gas outlet. Detailed Implementation

[0027] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0028] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are merely some, not all, of the embodiments of the present application. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative effort should fall within the scope of protection of the present application.

[0029] It should be noted that the terms "first," "second," etc., used in this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be used interchangeably where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0030] It should be understood that when an element (such as a layer, film, region, or substrate) is described as being "on" another element, the element may be directly on the other element, or there may be an intermediate element present. Moreover, in this application, when an element is described as being "connected" to another element, the element may be "directly connected" to the other element, or "connected" to the other element via a third element.

[0031] Example 1

[0032] Please refer to Figure 1 , Figure 2 One embodiment of this application provides a rapid identification device for oil and gas-bearing sections in core samples, comprising: a core holder 107, a core holder opening and closing controller 105, and a gas transmission pipe 104; the core holder 107 has an opening on its first side, through which a core is inserted and held; the core holder opening and closing controller 105 is located on the second side of the core holder 107, and controls the opening and closing of the core holder 107 to facilitate the insertion and removal of the core; the first end of the gas transmission pipe 104 is connected to a pump-suction hydrocarbon gas detector 103; the second end of the gas transmission pipe 104 extends into the core holder 107, for transmitting gas lost from the core to the pump-suction hydrocarbon gas detector 103.

[0033] A handheld rapid identification device for oil and gas-bearing sections in rock cores is designed to meet the needs of oil and gas field exploration and development. This technical solution focuses on the speed and convenience of identifying oil and gas-bearing sections. By connecting to a high-sensitivity pump-suction hydrocarbon gas detector 103, the device can immediately identify high-oil-bearing sections, providing a convenient and rapid basis for sampling and testing the oil and gas content of shale and mudstone. This significantly shortens sampling time, effectively avoids the loss of large amounts of light hydrocarbons, and provides accurate test data for evaluating the oil and gas content of shale and mudstone.

[0034] In one embodiment, the core holder 107 includes an openable core clamp 201; a sealing ring 202 is fixed to the surface of the core clamp 201 that holds the core; the sealing ring 202 is used to wrap the core. Preferably, the sealing ring 202 is an oil-resistant and wear-resistant rubber sealing ring 202. The core clamp 201 and the sealing ring 202 can achieve tight wrapping of a core of a certain length. The sealing ring 202 is flexible, wrapping the core in all directions to prevent the loss of light hydrocarbons in the core. The sealing ring 202 has oil-resistant, gas-resistant, and wear-resistant properties, resulting in excellent performance. The core clamp 201 opens to insert the core; the core clamp 201 closes to compress the core, facilitating the wrapping of the core by the sealing ring 202.

[0035] In one embodiment, the core clip 201 is arc-shaped, and the concave portion of the core clip 201 is used to wrap around the arc-shaped surface of the core. Preferably, the sealing ring 202 is fixed to the concave portion of the core clip 201, which can better fit the arc-shaped surface of the core and provide stronger wrapping.

[0036] In one embodiment, the core clamp 201 extends outward from the second side of the core holder 107 to form a core clamp extension piece 203; the core clamp extension piece 203 is connected to a core clamp opening and closing controller 105. The core clamp opening and closing controller 105 is used to control the opening and closing of the core clamp 201.

[0037] In one embodiment, the core clamp opening and closing controller 105 includes a spring connected between two core clamp extensions 203; the spring is compressed to clamp the core. Preferably, it mainly consists of multiple metal springs; normally, the springs support the core clamp 201 to maintain a certain degree of opening and closing; when the core clamp 201 wraps around the core, the springs are compressed, and the elastic force maintains the state of the core clamp 201 holding the core.

[0038] In one embodiment, a filter 106 for filtering mud from the core surface is provided on the core holder 107 at the position corresponding to the second end of the gas transmission pipe 104. Specifically, the filter 106 mainly filters the mud from the core surface to prevent clogging of the pump-suction hydrocarbon detector. The filter 106 is filled with a removable paper or sponge filter element. That is, the filter 106 contains a removable and easily replaceable paper or sponge filter element.

[0039] In one embodiment, the pump-suction hydrocarbon gas detector 103 includes a hydrocarbon gas detection body and a pump connected to the hydrocarbon gas detection body; the hydrocarbon gas detection body is provided with a detection module for hydrocarbon gas detection. Generally, one or more detection modules can be provided for detecting and analyzing the gas corresponding to the detection module.

[0040] Example 2

[0041] Please refer to Figure 1 , Figure 2 One embodiment of this application provides a handheld core oil and gas section rapid identification device, which mainly consists of the following parts: operating handle 101, pump-suction hydrocarbon gas detector 103, core holder 107, core holder opening and closing controller 105, and filter 106.

[0042] The following description, in conjunction with the accompanying drawings, provides further details:

[0043] 1. Operating handle 101

[0044] The operating handle 101 is connected to the pump-suction hydrocarbon gas detector 103 via a connecting cable 102. It is mainly used for switching the pump-suction hydrocarbon gas detector 103 on and off, and for facilitating the handheld rapid identification of the oil and gas section of the entire core.

[0045] 2. Pump-type hydrocarbon gas detector 103

[0046] This hydrocarbon gas detector features a built-in powerful pump that automatically draws in and detects gases. It offers multiple selectable hydrocarbon gas modes, displays the concentration, and allows for threshold alarm settings. Best of all, it is powered by a lithium battery, providing extended standby time and excellent portability.

[0047] 3. Core clamp 107

[0048] The core holder 107 mainly consists of a core clamp 201, a sealing ring 202, a core clamp extension 203, and a gas outlet 204. The sealing ring 202 is preferably an oil-resistant and wear-resistant rubber sealing ring 202. The core clamp 201 and sealing ring 202 can tightly wrap and hold a core of a certain length, and the sealing ring 202 has oil-resistant, gas-resistant, and wear-resistant properties. The core clamp extension 203 is connected to the core clamp opening and closing controller 105 to ensure the opening and closing of the core clamp 201. The gas outlet 204 is connected to a filter 106. Hydrocarbon gases lost from the core pass through the gas outlet 204 and the filter 106, and are then transmitted to the pump-type hydrocarbon gas detector 103 through the gas transmission pipe 104.

[0049] 4. Core clamp opening and closing controller 105

[0050] The core clamp opening and closing controller 105 is mainly composed of multiple metal springs. Under normal circumstances, the springs support the core clamp 201 to maintain a certain degree of opening and closing; when the core clamp 201 wraps around and clamps the core, the springs are compressed by force, and the elastic force maintains the clamping state of the core clamp 201.

[0051] 5. Filter 106

[0052] The filter 106 primarily filters the mud on the core surface, effectively preventing clogging of the pump-suction hydrocarbon gas detector 103. The interior of the filter 106 contains a removable and replaceable paper or sponge filter element.

[0053] The handheld core oil and gas-bearing section rapid identification device of the present invention takes into account the convenience of handheld use and rapid identification. It can identify high oil and gas-bearing sections in the first time, which can greatly shorten the sampling time and effectively avoid the loss of a large amount of light hydrocarbons. Thus, it can provide accurate test data for the evaluation of oil and gas content in mudstone and shale.

[0054] Example 3

[0055] Please refer to Figure 1 , Figure 2 One embodiment of this application provides an operating method for the rapid identification device for oil and gas-bearing sections in core samples as described in Embodiment 1 or the handheld rapid identification device for oil and gas-bearing sections in core samples as described in Embodiment 2. The specific implementation steps are as follows:

[0056] 1. Before the core is discharged from the cartridge, check the filter element inside filter 106 and replace it with a brand new filter element;

[0057] 2. Select the hydrocarbon gas mode of the pump-suction hydrocarbon gas detector 103 and set the alarm threshold;

[0058] 3. After the core is removed from the casing and placed in place, the surface of the core is simply wiped, and a section of the core is wrapped in the half-open core clamp 201; when the core clamp 201 holds the core, the core clamp 201 is in the open state; at this time, the sealing ring 202 remains in contact with the surface of the core;

[0059] 4. Turn on the start switch on the operating handle 101 to turn on the pump-suction hydrocarbon gas detector 103;

[0060] 5. Pump-type hydrocarbon gas detector 103 self-service inhaled gas detection, lasting 10-60 seconds; displays hydrocarbon concentration, and can sound an alarm when the threshold is reached.

[0061] 6. After completing the rapid selection of test samples, turn off the start switch.

[0062] Example 4

[0063] Please refer to Figure 1 , Figure 2 One embodiment of this application provides a method for rapid identification of oil and gas-bearing sections in core samples. This method is applied to the rapid identification device for oil and gas-bearing sections in core samples of Embodiment 1, and can also be applied to the handheld rapid identification device for oil and gas-bearing sections in core samples of Embodiment 2.

[0064] Specifically, the rapid identification method for oil and gas-bearing sections in core samples includes the following steps:

[0065] S1. Clean the surface of the core. Generally, after the core is removed from the cylinder and placed in place, wipe away mud, stones and other debris from the surface of the core for cleaning. This prevents the debris from affecting the fit of the sealing ring 202 to the core and also prevents the debris from entering the filter 106 or gas transmission pipe 104 and causing blockage, or prevents the debris from entering and damaging the pump-type hydrocarbon gas detector 103.

[0066] S2. Insert the core into the core holder 107 through the opening, and the core holder 107 clamps the core.

[0067] S3. Start the pump-suction hydrocarbon gas detector 103 to draw in the gas released from the core for detection; gas detection requires a certain time, and the pump-suction hydrocarbon gas detector 103 can display the hydrocarbon concentration; the pump-suction hydrocarbon gas detector 103 can sound an alarm when the threshold is reached; when selecting the pump-suction hydrocarbon gas detector 103, it is necessary to select a hydrocarbon gas mode suitable for the test sample and set the alarm threshold before gas detection.

[0068] Furthermore, to prevent filter 106 from becoming contaminated and clogged, and to prevent impurities from entering the pump-suction hydrocarbon gas detector 103; and to improve the service life and detection accuracy of the pump-suction hydrocarbon gas detector 103, a new filter element is used in filter 106 for each gas detection operation. Preferably, to achieve the above effects, the filter element in filter 106 is replaced with a new one before the core is placed into the core holder 107.

[0069] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A rapid identification device for oil and gas-bearing sections in rock cores, characterized in that, include: A core holder, wherein the first side of the core holder is provided with an opening, the core holder is used to hold a core; the core holder includes an openable core clamp; A core clamp opening and closing controller is disposed on the second side of the core clamp holder; and A gas transmission pipe is provided, with its first end connected to a pump-suction hydrocarbon gas detector; the second end of the gas transmission pipe extends into a core holder for transmitting gas lost from the core to the pump-suction hydrocarbon gas detector; the core holder is arc-shaped, with its concave portion used to wrap the arc-shaped surface of the core; a filter for filtering mud from the core surface is provided on the core holder at a position corresponding to the second end of the gas transmission pipe.

2. The rapid identification device for oil and gas-bearing sections in core samples according to claim 1, characterized in that, A sealing ring is fixed to the surface of the core clamp that holds the core; the sealing ring is used to wrap the core.

3. The rapid identification device for oil and gas-bearing sections in core samples according to claim 2, characterized in that, The sealing ring is made of oil-resistant and wear-resistant rubber.

4. A rapid identification device for oil and gas-bearing sections in core samples according to any one of claims 2-3, characterized in that, The core clamp extends outward on the second side of the core holder to form a core clamp extension plate; the core clamp extension plate is connected to the core clamp opening and closing controller.

5. The rapid identification device for oil and gas-bearing sections in core samples according to claim 4, characterized in that, The core clamp opening and closing controller includes a spring connected between two core clamp extensions; the spring is compressed to clamp the core.

6. The rapid identification device for oil and gas-bearing sections in core samples according to claim 1, characterized in that, The filter is filled with a removable paper or sponge filter element.

7. The rapid identification device for oil and gas-bearing sections in core samples according to claim 1, characterized in that, The pump-type hydrocarbon gas detector includes a hydrocarbon gas detection body and a pump connected to the hydrocarbon gas detection body; the hydrocarbon gas detection body is equipped with a detection module for hydrocarbon gas detection.

8. A method for rapid identification of oil and gas-bearing sections in cores based on the rapid identification device for oil and gas-bearing sections in cores according to any one of claims 1-7, characterized in that, Includes the following steps: S1. Clean the surface of the core sample; S2. Insert the core into the core holder through the opening, and the core holder clamps the core. S3. Start the pump-type hydrocarbon gas detector to draw in the gas released from the core for detection.

9. The method for rapid identification of oil and gas-bearing sections in core samples according to claim 8, characterized in that, Every time the pump-suction hydrocarbon gas detector performs gas detection, a new filter element is used.

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