Measuring tool and measuring system for pressure-maintaining coring

Abstract

The invention belongs to the technical field of drilling tools, and discloses a measuring tool and a measuring system for pressure-maintaining coring. The measuring tool for pressure-maintaining coring comprises a shell and filler, a first measuring element is fixedly arranged on the side wall of the shell, a second measuring element is arranged in a cavity of the shell, the first measuring element comprises a pressure measuring element and a wireless communication module, and the first measuring element and the second measuring element are in communication connection; the filler is filled in the shell, and the second measuring element is solidified in the filler and is electrically isolated; the shell and the filler are both non-metal composite materials with wave-transparent performance, and the measuring tool for pressure-maintaining coring can continuously work for more than 96 hours in the environment with the temperature of more than 200 DEG C and the pressure of more than 200 MPa. According to the invention, the overall size of the shell is reduced, so that a rock core with a relatively large volume can be obtained in a coring process; through dual protection of the shell and the filler, the coring barrel can continuously and stably work in a vibration environment, and real-time acquisition of measurement parameters in the coring barrel in a pressure maintaining state is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of drilling tools, and in particular to a measuring tool and a measuring system for pressure-maintaining coring. Background Art

[0002] In drilling engineering, pressure coring can be done by taking out the core under conditions close to the formation pressure, thereby maintaining the original state of the fluid and dissolved gas in the core, accurately obtaining the reservoir fluid saturation, reservoir pressure, reservoir physical properties and other parameters under bottom hole conditions, which is of great significance for correctly understanding the geological conditions, calculating the recoverable reserves of the oil field, the distribution of residual oil, and rationally formulating development plans. The pressure coring outer barrel is connected to the coring drill bit to transmit drilling pressure and torque; the inner barrel is suspended on the bearing as a container for the core. The pressure coring inner barrel has temperature and pressure measuring instruments inside, which can continuously measure the temperature and pressure in the coring barrel after coring to ensure that the temperature and pressure of the core in the pressure coring barrel are consistent with the temperature and pressure of the coring layer.

[0003] Existing pressure measuring tools for pressure-maintaining coring include internal and external types. Among them, the external pressure measuring tool usually includes a pressure measuring gauge and its data acquisition system, which is connected through a physical interface pre-set on the pressure-maintaining coring barrel. The switch of the control interface is turned on to connect the pressure-maintaining coring barrel with the pressure measuring gauge to read and store pressure data. The external pressure gauge measurement requires the fluid in the coring barrel to enter the pressure gauge, and the pressure is transmitted through extrusion deformation to complete the measurement. The operation is complicated, the risk is high, and it will produce large measurement errors. The internal pressure measuring tool is installed inside the pressure-maintaining coring barrel, and usually includes a pressure measuring gauge and its data acquisition system and a sealing and protection system. During the pressure-maintaining coring operation, an internal pressure measuring tool is installed inside the coring barrel and lowered to the bottom of the well along with the coring barrel. During the coring process, the pressure changes inside the pressure-maintaining coring barrel are continuously measured and recorded, and the collected pressure data is stored through the data acquisition system. After the measurement is completed, the coring barrel is opened and the data is read and processed through the communication interface. However, the damage rate of the communication interface is high. After damage, it is necessary to return to the laboratory to disassemble the instrument and equipment to read the data, which takes a long time. It is impossible to obtain the temperature and pressure information inside the coring barrel in time, which delays the on-site construction time.

[0004] When the temperature and pressure measuring tools for pressure-maintaining coring are all internal, the overall size of the measuring tools is large. The length of existing measuring tools exceeds 20 cm, which greatly restricts the size of the cores taken and increases the cost of coring. Summary of the invention

[0005] The object of the present invention is to provide a pressure-maintaining coring measuring tool and a measuring system, so as to solve the problems of large volume of the coring pressure-maintaining measuring tool and poor real-time performance of the measuring parameters.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] The present invention provides a pressure-maintaining coring measuring tool, comprising:

[0008] A housing, a first measuring element is fixedly arranged on a side wall of the housing, a second measuring element is arranged in a cavity of the housing, the first measuring element comprises a pressure measuring element and a wireless communication module, and the first measuring element is communicatively connected with the second measuring element;

[0009] A filler, wherein the filler is filled in the housing, and the second measuring element is solidified in the filler and electrically isolated;

[0010] The shell and the filler are both non-metallic composite materials with wave-transmitting properties;

[0011] The pressure-maintaining coring measuring tool can work continuously for more than 96 hours under a temperature of more than 200° C. and a pressure of more than 200 MPa.

[0012] In some embodiments, the filler solidifies the second measuring element by casting, and the second measuring element includes a temperature measuring element, an accelerometer, an angular velocity meter, a timer, a power module and a data storage module.

[0013] In some embodiments, the housing includes an upper housing and a lower housing, and the upper housing and the lower housing are detachably connected.

[0014] In some embodiments, a sealing ring is provided between the upper shell and the lower shell.

[0015] In some embodiments, the upper shell and the lower shell are provided with a first mounting hole and a second mounting hole at opposite distal ends thereof, respectively, and the pressure measuring element and the wireless communication module are respectively mounted in the first mounting hole and the second mounting hole.

[0016] In some embodiments, the pressure measuring element is a nano-thin film pressure sensor.

[0017] In some embodiments, the maximum outer diameter of the shell does not exceed 4 cm.

[0018] In some embodiments, the shell is made of any one of carbon fiber, fiberglass and polyetheretherketone or a mixture of two or more thereof, and the mass percentage of any one component in the mixture is not less than 20%.

[0019] In some embodiments, the filler is any one of polydimethylsiloxane and phenyl silicone rubber or a mixture of two or more thereof, and the mass percentage of any one component in the mixture is not less than 20%.

[0020] The present invention also provides a pressure-maintaining coring measurement system, comprising a host computer and the pressure-maintaining coring measurement tool provided by the present invention, wherein the host computer is communicatively connected to a wireless communication module in the pressure-maintaining coring measurement tool to obtain measurement parameters and process and analyze the measurement parameters.

[0021] Beneficial effects of the present invention:

[0022] The pressure-maintaining coring measuring tool provided by the present invention has a first measuring element fixedly arranged on a shell, and the first measuring element includes a pressure measuring element and a wireless communication module, so that the overall size of the shell is reduced, which is more conducive to obtaining a larger core during the coring process; a filler is arranged in the shell to solidify the second measuring element, so that the second measuring element is under the dual protection of the shell and the filler, and can continue to work stably in a vibration environment, and real-time collection and transmission of measurement parameters are achieved through the wireless communication module, and real-time acquisition of measurement parameters in the coring barrel under the pressure-maintaining state is achieved; the shell and the filler are both non-metallic composite materials with wave-transmitting properties, and are more suitable for nuclear magnetic resonance pressure-maintaining coring tools, and can obtain reservoir core samples in a near-in-situ state.

[0023] The measurement system for pressure-maintaining coring provided by the present invention comprises a host computer and a measurement tool for pressure-maintaining coring provided by the present invention. The host computer is communicatively connected with a wireless communication module in the measurement tool for pressure-maintaining coring to obtain measurement parameters and process and analyze the measurement parameters, thereby realizing real-time collection and analysis of the measurement parameters under pressure-maintaining conditions, and solving the problem of poor real-time performance of the measurement parameters of pressure-maintaining coring. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic cross-sectional structure diagram of a pressure-maintaining coring measuring tool provided in an embodiment of the present invention;

[0025] Figure 2 It is a cross-sectional view of a shell in a pressure-maintaining coring measuring tool provided in an embodiment of the present invention.

[0026] In the figure:

[0027] 1. Shell; 11. Upper shell; 111. First mounting hole; 12. Lower shell; 121. Second mounting hole;

[0028] 2. Packing; 3. Pressure measuring element; 4. Wireless communication module; 5. Sealing ring. DETAILED DESCRIPTION

[0029] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0030] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0032] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0033] The present invention provides a pressure-maintaining coring measuring tool, such as Figure 1 and Figure 2 As shown, it includes a shell 1 and a filler 2, wherein a first measuring element is provided on the side wall of the shell 1, and the first measuring element at least includes a pressure measuring element 3 and a wireless communication module 4; a second measuring element is provided in the cavity 13 of the shell 1, and the first measuring element and the second measuring element are communicatively connected; the filler 2 is filled in the shell 1, and the second measuring element is solidified in the filler 2; the shell 1 and the filler 2 are both non-metallic composite materials with wave-transmitting properties, and the pressure-maintaining coring measuring tool can work continuously for more than 96 hours under a temperature above 200°C and a pressure environment above 200MPa.

[0034] The pressure-maintaining coring measuring tool provided by the present invention, the first measuring element and the second measuring element are both miniaturized measuring elements, such as the pressure measuring element 3 can be a nano film pressure sensor, which has the advantages of ultra-small volume, ultra-large range and ultra-high precision compared with the commonly used pressure sensors in the past. By arranging the first measuring element in the shell 1 and the second measuring element in the shell 1, the overall size of the shell 1 can be reduced. Relatively speaking, the core section of the pressure-maintaining coring can be greatly increased during the coring process, which is more conducive to obtaining a larger core. In this embodiment, the second measuring element is solidified by arranging the filler 2 in the shell 1, so that the second measuring element can continue to work stably under the dual protection of the shell 1 and the filler 2, and the real-time collection and transmission of the measurement parameters are realized through the wireless communication module 4, and the real-time acquisition of the measurement parameters in the coring barrel under the pressure-maintaining state is realized; the shell 1 and the filler 2 are both non-metallic composite materials with wave-transmitting properties, and are more suitable for the pressure-maintaining coring tool of nuclear magnetic resonance, which can obtain reservoir core samples in a near-in-situ state and has a good "oil and gas preservation" effect. It should be noted that the filler 2 is made of insulating material, thereby being able to electrically isolate the second measuring element.

[0035] In some embodiments, the filler 2 solidifies the second measuring element by casting. The first measuring element and the second measuring element are solidified by casting, which is easy to shape and can adapt to the second measuring element with complex shape and the accessories such as the wires of the second measuring element. The solidification effect is good and the position of the second measuring element is stable. It can be understood that in the pressure-maintaining coring measuring tool, the measurement parameters of each first measuring element and the second measuring element are centrally transmitted through the Bluetooth communication module in the first measuring element. The filler 2 solidifies each first measuring element and the second measuring element and also solidifies each communication wire to achieve stable data transmission.

[0036] In some embodiments, the housing 1 includes an upper housing 11 and a lower housing 12 , and the upper housing 11 and the lower housing 12 are detachably connected.

[0037] like Figure 1 As shown, the upper shell 11 and the lower shell 12 can be connected by threads. Specifically, in the upper shell 11 or the lower shell 12, one is provided with an internal thread and the other is provided with an external thread. After the connection, the upper shell 11 and the lower shell 12 form a structure with an ellipsoidal or spherical appearance, which has good consistency in appearance and is easy to place and measure. After the shell 1 is placed in the core barrel, it can protect the measuring element in a high temperature and high pressure environment to ensure the stable measurement of the measuring element and the transmission of the measurement parameters.

[0038] In some embodiments, a sealing ring 5 is provided between the upper shell 11 and the lower shell 12 to achieve sealing of the connection between the upper shell 11 and the lower shell 12. Preferably, the sealing ring 5 is made of fluororubber. When the upper shell 11 and the lower shell 12 are connected, the sealing ring 5 can be clamped to achieve sealing.

[0039] In some embodiments, the first mounting hole 111 and the second mounting hole 121 are respectively provided at the opposite distal ends after the upper shell 11 and the lower shell 12 are connected, and the first mounting hole 111 and the second mounting hole 121 are respectively used to mount the pressure measuring element 3 and the wireless communication module 4 .

[0040] like Figure 1 and Figure 2 In the illustrated embodiment, the pressure measuring element 3 is installed in the second mounting hole 121 of the lower shell 12, and the wireless communication module 4 is installed in the first mounting hole 121 of the upper shell 11. It should be noted that the mounting positions of the pressure measuring element 3 and the wireless communication module 4 are interchangeable, and only the relative positions are illustrated in the figure. Since the measuring tool for pressure-maintaining coring does not have a fixed position and state after being placed in the coring barrel, the upper shell 11 and the lower shell 12 are distinguished by position for the convenience of description. Figure 1 In the embodiment, the first mounting hole 111 and the second mounting hole 121 are both stepped holes, which can increase the installation stability of the pressure measuring element 3 and the wireless communication module 4, wherein the pressure measuring element 3 and the wireless communication module 4 are both welded and fixedly connected to the upper shell 11 or the lower shell 12. When the filler 2 is poured, a wire or a guide interface for connecting the pressure measuring element 3 and the wireless communication module 4 is reserved for easy installation and connection.

[0041] In some embodiments, the maximum outer diameter of the shell 1 does not exceed 4 cm. The measuring tools in the prior art are generally more than 20 cm in length, which greatly restricts the size of the core taken and increases the cost of coring. The embodiment of the present invention selects a miniaturized first measuring element and a second measuring element, and solidifies each first measuring element and each second measuring element by electrical isolation through a filler 2, and selects a spherical or ellipsoidal shell 1. Through reasonable layout, the maximum outer diameter of the shell 1 can be less than 4 cm, which is more than 80% smaller than the volume size of the existing measuring tools. Furthermore, the short axis diameter of the ellipsoidal shell 1 is 20 mm, the long axis diameter is 26 mm, and the minimum inner diameter of the upper shell 11 or the lower shell 12 with an external thread section is 10.4 mm, which can meet the packaging and solidification of the first measuring element and the second measuring element and the reading and transmission of the measurement parameters under high temperature and high pressure conditions.

[0042] In some embodiments, the second measuring element further includes an accelerometer, an angular velocity meter, a timer, a power module, and a data storage module.

[0043] It should be noted that for the pressure measuring element 3, a nano film pressure sensor is selected, with a range of 0-200MPa and an accuracy of 0.1%; the accelerometer, angular velocity meter, and timer are all high temperature resistant micro devices with a temperature resistance of more than 200°C; the temperature sensor has a range of 0-300°C and an accuracy of 0.1%; the power module uses a high temperature and high pressure battery and circuit system, which can achieve continuous power supply for more than 200 hours under 200°C and 200MPa conditions, and the data storage module uses a high temperature and high pressure memory to achieve the storage function of millions of data points, and achieve continuous measurement of one point per second for more than 200 hours; the wireless communication module 4 uses a Bluetooth communication module that is resistant to 200°C to ensure that the wireless communication module 4 works normally in a high temperature environment. By selecting the above first measuring element and the second measuring element, the detection and wireless transmission of the measurement parameters under high temperature and high pressure holding conditions can be realized, so that the timely and effective holding parameters in the core barrel can be obtained.

[0044] In some embodiments, the shell 1 is made of any one of carbon fiber, fiberglass and polyetheretherketone or a mixture of two or more thereof, and the mass percentage of any one component in the mixture is not less than 20%.

[0045] In some embodiments, the filler 2 is any one of polydimethylsiloxane and phenyl silicone rubber or a mixture of two or more thereof, and the mass percentage of any one component in the mixture is not less than 20%.

[0046] In the present invention, the shell 1 and the filler 2 are both non-metallic composite materials with wave-transmitting properties. The high-strength non-metallic material can pass the nuclear magnetic resonance experimental equipment and can work stably for a long time at a high temperature of 200°C and a pressure of 200Mpa, protecting the first measuring element and the second measuring element from being used normally in extreme environments. The materials selected for the shell 1 and the filler 2 are not conductive in themselves. The filler 2 is cast to solidify the first measuring element and / or the second measuring element to fuse into a whole, thereby improving the mechanical integrity of the measuring tool for pressure-maintaining coring. It should be noted that, according to the temperature and pressure conditions of the environment in which the coring barrel is located, by adding carbon fiber and / or fiberglass to polyetheretherketone PEEK, the overall high temperature and high pressure resistance of the shell 1 can be improved. Similarly, the filler 2 mixed with polydimethylsiloxane and phenyl silicone rubber can also improve the high temperature and high pressure resistance of the filler 2.

[0047] The present invention also provides a pressure-maintaining coring measurement system, comprising a host computer and a pressure-maintaining coring measurement tool provided in an embodiment of the present invention, wherein the host computer is communicatively connected with a wireless communication module 4 in the pressure-maintaining coring measurement tool to obtain measurement parameters and process and analyze the measurement parameters.

[0048] Specifically, in the pressure-maintaining coring measurement system, the wireless communication module 4 is provided on the housing 1 with a Bluetooth communication module and is solidified by the filler 2. The host computer includes tools such as laptop computers, mobile phones, and tablet computers with Bluetooth communication modules. The host computer has a data analysis system, which can be applied to data analysis software in different operating systems through programming design, and realizes multiple functions such as real-time reading, drawing, and comparative analysis of the measured parameters after transmission through the Bluetooth communication module. The host computer is connected to the pressure-maintaining coring measurement tool for communication, and can obtain the measured parameters in the coring barrel and process and analyze the measured parameters, so as to realize the real-time collection and analysis of the measured parameters under the pressure-maintaining conditions, solve the problem of poor real-time performance of the measured parameters of the pressure-maintaining coring, and provide accurate basic physical parameters for the tests such as core gas content test, rock physical property test, and reservoir fluid property analysis carried out indoors, which is of great significance for correctly understanding the geological conditions, calculating the recoverable reserves of the oil field, and conducting reservoir evaluation and sensitivity analysis.

[0049] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A pressure-maintaining coring measuring tool, characterized in that: include: A housing (1), wherein a first measuring element is fixedly arranged on a side wall of the housing (1), a second measuring element is arranged in a cavity (13) of the housing (1), the first measuring element comprises a pressure measuring element (3) and a wireless communication module (4), and the first measuring element and the second measuring element are communicatively connected; A filler (2), the filler (2) being filled in the housing (1), the second measuring element being solidified in the filler (2) and electrically isolated; The shell (1) and the filler (2) are both non-metallic composite materials with wave-transmitting properties; The pressure-maintaining coring measuring tool can work continuously for more than 96 hours under a temperature of more than 200° C. and a pressure of more than 200 MPa.

2. The pressure-maintaining coring measuring tool according to claim 1, characterized in that: The filler (2) solidifies the second measuring element by means of casting, and the second measuring element comprises a temperature measuring element, an accelerometer, an angular velocity meter, a timer, a power module and a data storage module.

3. The pressure-maintaining coring measuring tool according to claim 1, characterized in that: The housing (1) comprises an upper housing (11) and a lower housing (12), and the upper housing (11) and the lower housing (12) are detachably connected.

4. The pressure-maintaining coring measuring tool according to claim 3, characterized in that: A sealing ring (5) is provided between the upper shell (11) and the lower shell (12).

5. The pressure-maintaining coring measuring tool according to claim 3, characterized in that: A first mounting hole (111) and a second mounting hole (121) are respectively provided at the opposite distal ends of the upper shell (11) and the lower shell (12) after being connected, and the first mounting hole (111) and the second mounting hole (121) are used to respectively mount the pressure measuring element (3) and the wireless communication module (4).

6. The pressure-maintaining coring measuring tool according to any one of claims 1 to 5, characterized in that: The pressure measuring element (3) is a nano-thin film pressure sensor.

7. The pressure-maintaining coring measuring tool according to any one of claims 1 to 5, characterized in that: The maximum outer diameter of the shell (1) does not exceed 4 cm.

8. The pressure-maintaining coring measuring tool according to any one of claims 1 to 5, characterized in that: The shell (1) is made of any one of carbon fiber, glass fiber reinforced plastic and polyetheretherketone or a mixture of two or more thereof, and the mass percentage of any one component in the mixture is not less than 20%.

9. The pressure-maintaining coring measuring tool according to any one of claims 1 to 5, characterized in that: The filler (2) is any one of polydimethylsiloxane and phenyl silicone rubber or a mixture of two or more thereof, and the mass percentage of any one component in the mixture is not less than 20%.

10. The pressure-maintaining coring measurement system is characterized by: It comprises a host computer and the pressure-maintaining coring measuring tool according to any one of claims 1 to 9, wherein the host computer is communicatively connected with a wireless communication module (4) in the pressure-maintaining coring measuring tool to obtain measurement parameters and process and analyze the measurement parameters.

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