LU500068B1 - A Test Device for Leak Resistance and Plugging While Drilling and Its Method - Google Patents
A Test Device for Leak Resistance and Plugging While Drilling and Its Method Download PDFInfo
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- LU500068B1 LU500068B1 LU500068A LU500068A LU500068B1 LU 500068 B1 LU500068 B1 LU 500068B1 LU 500068 A LU500068 A LU 500068A LU 500068 A LU500068 A LU 500068A LU 500068 B1 LU500068 B1 LU 500068B1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
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Abstract
The present invention relates to a test device for leak resistance and plugging while drilling and its method. The said device consists of a plugging fluid storage tank, a plugging simulator, and a control and measurement system, as well as a data analysis and processing system. Wherein, the plugging fluid storage tank mainly consists of a top cap of the storage tank, an oil inlet, a piston of the storage tank, an outer cylinder of the storage tank, a bottom cap of the storage tank, an outlet of the plugging fluid, and a storage tank base. Wherein, the plugging simulator mainly consists of a pressure sensor, a three-phase motor, a rotation speed controller, a back-pressure pipeline, a rotating vertical shaft, a back-pressure valve, a rotating seal, a plug, an electric heater, a high-temperature and high-pressure rubber cylinder, a temperature and pressure sensor, trays of simulator, a fluid inlet, a bottom cap of the core kettle, a simulator base, and a core kettle. The present invention can be applied to the test device for leak resistance and plugging while drilling, which can simulate the plugging effect of the permeable leakage and the fractured leakage occurred during oil-gas field drilling operation, in addition, the present invention adopts reliable principle and proper structure, which can simulate the operation status of the tool of leak resistance and plugging while drilling, and is convenient to select perfect plugging materials and evaluate the plugging effect.
Description
A Test Device for Leak Resistance and Plugging While Drilling and Its Method Technical Field The present invention relates to a test device for leak resistance and plugging while drilling and its method.
Background Technology Lost circulation is one of the complex challenges of downhole operations frequently occurred during the process of oil and natural gas drilling operations, which is embodied in that the drilling operating fluid (i.e., drilling fluid, cement slurry, completion fluid, and workover fluid, etc.) existed in the pitshaft leaks in the formation under the action of pressure difference.
Once the lost circulation occurs during drilling operation, it will not only lose drilling fluid and plugging materials, delay drilling time, increase the cost of drilling operations, but also may cause complicated accidents of downhole operations such as jamming of a drilling tool, borehole collapse, and blowout, etc., even may lead to scrap of boreholes in severe cases.
Permeable lost circulation and fractured lost circulation are the most common forms of lost circulation occurred during the process of oil-gas well drilling. Through utilizing the jet flow energy of the lateral nozzles of the tool of leak resistance and plugging while drilling, such solid phase particulate materials as the plugging agent used while drilling, the bridge plugging agent, and the gel plugging agent of the plugging drilling fluid system are shot towards the formation where permeable or fractured leakage occurred, and thus form a densified and low- permeable “artificial borehole wall” on the borehole wall located in the formation where the leakage occurred, which can effectively achieve proper plugging of permeable leakage and fractured leakage. However, it is undoubtedly impractical to evaluate the plugging effect of plugging materials based upon field tests. Therefore, the usual approach is to utilize test device to simulate the downhole formation conditions, and then select various perfect plugging materials through laboratory test as well as evaluate their plugging effects, and thus form the plugging drilling fluid system while drilling.
Nowadays, there are many devices are commonly adopted to simulate leakage cracks and evaluate plugging effects in China, which include the API indoor static plugging evaluation test device, the DL-1 type plugging test device, and the JLX-2 dynamic plugging tester, etc. In addition, the structural principles of these devices are basically the same: ie, install a stainless-steel crack mold inside the simulated wellbore to simulate the leakage formation, and then drive the plugging slurry into the simulated formation during performing the experiment, then, evaluate the plugging effects after standing for a while. However, due to the difference between the properties of simulated formation and the actual formation is relatively 1 large, it always results in a large difference between the laboratory test results and the field LU500068 application effects. Even more importantly, such type of device cannot simulate the state of motion of the tool of leak resistance and plugging while drilling in the wellbore and the jet effect of the lateral nozzle.
In conclusion, there is no test device is available to simulate the plugging effects of the tool of leak resistance and plugging while drilling currently. In view of the aforesaid shortcomings of the prior art, the main purpose of the present invention is to provide a test device for leakage prevention and plugging while drilling and its method.
Summary of the Invention In order to address the aforesaid technical problems, the purpose of the present invention is to provide a test device for leakage prevention and plugging while drilling and its method, which can evaluate and select perfect plugging materials and conduct research on the plugging effects and formulas of plugging drilling fluid systems, completion fluid systems, and other operating fluid systems.
The test device for leak resistance and plugging while drilling of the present invention consists of a plugging fluid storage tank which is used to store the plugging fluid, a plugging simulator which is connected to the outlet of the plugging fluid, and a control and measurement system which is used to control and record the operation status of the plugging simulator; The said plugging simulator consists of a simulator base, trays of the simulator arranged on the simulator base, and the body of the plugging simulator arranged on the said trays of the simulator, wherein, the said body of the plugging simulator consists of a core kettle with hollow cylinder structure, and there is a bottom cap of the core kettle is connected to the lower open end of the said core kettle, as well as there is a plug is arranged on the upper open end of the said core kettle, in addition, there is a fluid inlet is arranged on the lower part of the said core kettle; Furthermore, there is a high-temperature and high-pressure rubber cylinder is arranged inside the said core kettle, wherein, the test core is an artificial core with hollow cylinder structure, and the test core is fixed inside the cylindrical space formed by the inside wall of the high-temperature and high-pressure rubber cylinder, the bottom cap of the core kettle, and the plug; in addition, the inside wall of the said core kettle and the outside wall of the high-temperature and high-pressure rubber cylinder form an annular space that can apply confining pressure, and there are electric heater and temperature and pressure sensor are arranged inside the annular space to heat the test core and measure the temperature and the confining pressure of the core kettle under the experimental conditions; moreover, there are a rotating mechanism and a back pressure pipeline are arranged on the plug, and the said rotating mechanism consists of a rotating vertical shaft with hollow tubular column structure, and there is a rotation speed controller is installed on the upper end of the said rotating vertical 2 shaft, meanwhile, the lower end of the said rotating vertical shaft passes through the plug and LU500068 is arranged in the internal cavity of the test core, and the upper end of the rotating vertical shaft is connected to the outlet of the plugging fluid of the plugging fluid storage tank, as well as there is a rotating seal is equipped between the rotating vertical shaft and the plug; in addition, the tool of leak resistance and plugging while drilling is threadedly connected to the lower end of the rotating vertical shaft; and the pressure sensor used to measure the pressure of the plugging fluid flowing in the core kettle is located at the upper end of the rotating vertical shaft; and the said back pressure pipeline passes through the plug, and one end of the back pressure pipeline is connected to the internal cavity of the test core, and the other end is equipped with a back pressure valve which is used to control the pressure of the annular space formed between the rotating vertical shaft and the inside wall of the test core.
Further, the said control and measurement system consists of: an oil hydraulic pump, which is connected to the oil inlet, and the said oil hydraulic pump is connected with an oil pressure measuring device which is used to measure oil pressure entering in the upper part of the fluid storage tank; and a pump pressure measuring device, which is connected to the pressure sensor to measure the pressure of the plugging fluid flowing in the core kettle; and a confining pressure pump, which is connected to the fluid inlet and used to provide confining pressure to the test core equipped in the plugging simulator; and a confining pressure measuring device, which is used to measure the confining pressure of the test; and a temperature measuring device, which is connected to the temperature and pressure sensor arranged in the plugging simulator and used to measure the temperature of the test; as well as a speed regulation device, which is connected to the three-phase motor of the plugging simulator, wherein, there are a rotation speed measuring device, which is used to measure the rotation speed of the rotating vertical shaft, and a drilling speed measuring device, which is used to measure the lowering speed of the rotating vertical shaft, are equipped on the speed regulation device.
Further, it further consists of a data analysis and processing system, which is connected to the said oil pressure measuring device, the pump pressure measuring device, the confining pressure measuring device, the temperature measuring device, the rotation speed measuring device, and the drilling speed measuring device and used to obtain corresponding data of the measurement test and complete subsequent analysis and processing operation.
Further, the said trays of the simulator are divided into three layers: i.e., the upper, the middle and the lower layers, wherein, the bottom cap of the core kettle is arranged on the tray located on the lowest layer of the simulator, and the outside wall of the core kettle is fixedly connected to the tray located on the middle layer of the simulator, and the three-phase motor is connected to the rotation speed control system, and is fixedly installed on the tray located on the uppermost layer of the simulator.
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Further, the said plugging fluid storage tank consists of an outer cylinder of the storage LU500068 tank, and there is a top cap of the storage tank is arranged on the upper open end of the said outer cylinder of the storage tank, meanwhile, there is a bottom cap of the storage tank is arranged on the lower open end of the said outer cylinder of the storage tank, in addition, there is a piston of the storage tank is arranged in the said outer cylinder of the storage tank, and there is a fluid inlet is arranged on the said top cap of the storage tank, as well as there is an outlet of the plugging fluid is arranged at the lower part of the said outer cylinder of the storage tank.
Further, the said top cap of the storage tank is threadedly connected to the said outer cylinder of the storage tank, and there is a storage tank base is threadedly connected to the said bottom cap of the storage tank.
Further, there is a rotating seal is equipped between the said rotating vertical shaft and the plug; and there are annular seals are equipped between the said outlet of the plugging fluid and the outer cylinder of the storage tank, and between the oil inlet and the top cap of the storage tank, between the back pressure pipeline and the plug, as well as between the fluid inlet and the outside wall of the core kettle respectively.
The test method for leakage prevention and plugging while drilling of the present invention adopts the aforesaid test device for leakage prevention and plugging while drilling to complete the test, wherein: Pour the prepared plugging drilling fluid system into the plugging fluid storage tank, and install the piston and the top cap of the storage tank; Assemble the rotating vertical shaft connected with the tool of leak resistance and plugging while drilling and the plug; and then place the prepared test core in the high- temperature and high-pressure rubber cylinder of the plugging simulator; Install the assembled plug with the rotating vertical shaft and back pressure pipeline on the top of the core kettle, and then fix the test core through utilizing the high-temperature and high-pressure rubber cylinder, the plug and the bottom cap of the core kettle, Install the pressure sensor on the top of the rotating vertical shaft, and then install the temperature and pressure sensor on the bottom of the core kettle, and connect relevant lines and pipelines; Turn on the control and measurement system and the data analysis and processing system, wherein, the computer sets up the temperature and confining pressure required for the test, after that, turn on the confining pressure pump, and then inject hydraulic oil into the annular space between the high-temperature and high-pressure rubber cylinder and the core kettle to apply confining pressure to the test core; meanwhile, turn on the electric heater to heat up the test core; 4
When the values of temperature-pressure and temperature reach the required values, LU500068 turn on the three-phase motor and the speed regulation device, and then set the rotation speed and lowering speed of the rotating vertical shaft; meanwhile, set the displacement oil pressure, and turn on the oil pressure pump, at that time, the hydraulic oil pushes the piston down to displace the plugging drilling fluid in the plugging fluid storage tank and drive it to flow into the rotating vertical shaft, and then the plugging drilling fluid would be sprayed out through the lateral nozzle of the tool of leak resistance and plugging while drilling; With the continuous rotation and lowering of the rotating vertical shaft, the plugging drilling fluid forms an “artificial core” on the inside wall of the test core to complete the plugging process; During the whole process, the oil pressure measuring device, the pump pressure measuring device, the confining pressure measuring device, the temperature measuring device, the rotation speed measuring device, and the drilling speed measuring device equipped in the control and measurement system 3 can record and store relevant data.
Based on aforesaid scheme, the present invention has following advantages at least: (1) Due to the rotation and lowering can be done through driving the rotating vertical shaft by the motor to, the rotation speed and the lowering speed are controllable, which can simulate the operation status of the tool of leak resistance and plugging while drilling in the wellbore more realistically. Meanwhile, the device pressure sensor and the back pressure valve are used to record the pressure change of the wellbore fluid during the operation of the tool, which can be conducive to subsequent data analysis.
(2) The design of the electric heater and the applied confining pressure can simulate the temperature and pressure conditions experienced by the core in the wellbore, which is closer to the actual conditions of the leakage formation. In addition, the setting of the temperature and pressure sensor makes the test environment more controllable.
(3) The test core adopted can be the real core of the drilled leakage formation, or the cement mortar core prepared in the laboratory. When the laboratory core is used, cores with different porosity, permeability, and strength can be obtained through adjusting the components of cement mortar, which can simulate formations with different lithologies and physical properties.
The above description is only an overview of the technical scheme of the present invention. For the purpose of understanding the technical approaches of the present invention more clearly and implementing them in accordance with the content of the specification, the preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. 5
Brief Description of the Drawings LU500068 Figure 1 is a structural schematic diagram of a test device for leak resistance and plugging while drilling of the present invention; Figure 2 is a schematic diagram of a plugging fluid storage tank of a test device for leak resistance and plugging while drilling of the present invention; Figure 3 is a schematic diagram of a plugging simulator of a test device for leak resistance and plugging while drilling of the present invention; Figure 4 is a schematic diagram of the control and measurement system of a test device for leak resistance and plugging while drilling of the present invention; In figures: 1 represents the plugging fluid storage tank; 2 represents the plugging simulator; 3 represents the control and measurement system; 4 represents the data analysis and processing system; 11 represents the top cap of the storage tank; 12 represents the oil inlet; 13 represents the piston of the storage tank; 14 represents the outer cylinder of storage tank; 15 represents the bottom cap of storage tank; 16 represents the outlet of the plugging fluid; 17 represents the storage tank base; 21 represents the pressure sensor; 22 represents the three-phase motor; 23 represents the rotation speed controller; 24 represents the back pressure pipeline; 25 represents the rotating vertical shaft, 26 represents the back pressure valve; 27 represents the rotating seal; 28 represents the plug; 29 represents the electric heater; 210 represents the high-temperature and high-pressure rubber cylinder; 211 represents the tool of leak resistance and plugging tool while drilling; 212 represents the temperature and pressure sensor; 213 represents the tray of the simulator; 214 represents the fluid inlet; 215 represents the bottom cap of the core kettle; 216 represents the test core; 217 represents the simulator base; 218 represents the core kettle; 31 represents the confining pressure pump; 32 represents the confining pressure measuring device; 33 represents the temperature measuring device; 34 represents the oil pressure pump; 35 represents the oil pressure measuring device; 36 represents the pump pressure measuring device; 37 represents the speed regulation device; 38 represents the rotation speed measuring device; 39 represents the drilling speed measuring device.
Detailed Description of the Presently Preferred Embodiments The text below will further describe the specific implementation of the present invention in detail in conjunction with the accompanying drawings and embodiments. The following embodiment are used to illustrate the present invention, rather than imposing restrictions on the scope of the present invention.
Embodiment 1 The test device for leak resistance and plugging while drilling of the present embodiment consists of a plugging fluid storage tank which is used to store the plugging fluid, a plugging 6 simulator which is connected to the outlet of the plugging fluid, and a control and measurement LU500068 system which is used to control and record the operation status of the plugging simulator; The said plugging simulator consists of a simulator base, trays of the simulator arranged on the simulator base, and the body of the plugging simulator arranged on the said trays of the simulator, wherein, the said body of the plugging simulator consists of a core kettle with hollow cylinder structure, and there is a bottom cap of the core kettle is connected to the lower open end of the said core kettle, as well as there is a plug is arranged on the upper open end of the said core kettle, in addition, there is a fluid inlet is arranged on the lower part of the said core kettle; Furthermore, there is a high-temperature and high-pressure rubber cylinder is arranged inside the said core kettle, wherein, the test core is an artificial core with hollow cylinder structure, and the test core is fixed inside the cylindrical space formed by the inside wall of the high-temperature and high-pressure rubber cylinder, the bottom cap of the core kettle, and the plug; in addition, the inside wall of the said core kettle and the outside wall of the high-temperature and high-pressure rubber cylinder form an annular space that can apply confining pressure, and there are electric heater and temperature and pressure sensor are arranged inside the annular space to heat the test core and measure the temperature and the confining pressure of the core kettle under the experimental conditions; moreover, there are a rotating mechanism and a back pressure pipeline are arranged on the plug, and the said rotating mechanism consists of a rotating vertical shaft with hollow tubular column structure, and there is a rotation speed controller is installed on the upper end of the said rotating vertical shaft, meanwhile, the lower end of the said rotating vertical shaft passes through the plug and is arranged in the internal cavity of the test core, and the upper end of the rotating vertical shaft is connected to the outlet of the plugging fluid of the plugging fluid storage tank, as well as there is a rotating seal is equipped between the rotating vertical shaft and the plug; in addition, the tool of leak resistance and plugging while drilling is threadedly connected to the lower end of the rotating vertical shaft; and the pressure sensor used to measure the pressure of the plugging fluid flowing in the core kettle is located at the upper end of the rotating vertical shaft; and the said back pressure pipeline passes through the plug, and one end of the back pressure pipeline is connected to the internal cavity of the test core, and the other end is equipped with a back pressure valve which is used to control the pressure of the annular space formed between the rotating vertical shaft and the inside wall of the test core.
Referring to Figure 1 and Figure 4, the present embodiment consists of a plugging fluid storage tank 1, a plugging simulator 2, a control and measurement system 3, and a data analysis and processing system 4.
The plugging fluid storage tank 1 consists of a top cap of the storage tank 11, an oil inlet 12, a piston of the storage tank 13, an outer cylinder of the storage tank 14, a bottom cap of the storage tank 15, an outlet of the plugging fluid 16, and a storage tank base 17. Wherein, 7 the bottom cap of the storage tank 15 is fixedly installed on the storage tank base 17, the lower LU500068 end of the outer cylinder of the storage tank 14 is threadedly connected to the storage tank base 17, and the lower end of the outer cylinder of the storage tank 14 is equipped with an outlet of the plugging fluid 16, meanwhile, there is an annular seal is arranged between the outlet of the plugging fluid 16 and the outer cylinders of the storage tank 14. The piston of the storage tank 13 is fitted inside the plugging fluid storage tank 1, and the top cap of the storage tank 11 is threadedly connected to the top of the outer cylinder of the storage tank 14. In addition, there is an oil inlet 12 is arranged on the top cap of the storage tank 11, meanwhile, there is an annular seal is arranged between the oil inlet 12 and the top cap of the storage tank 11.
The plugging simulator 2 consists of a pressure sensor 21, a three-phase motor 22, a rotation speed controller 23, a back pressure pipeline 24, a rotating vertical shaft 25, a back pressure valve 26, a rotating seal 27, a plug 28, an electric heater 29, a high-temperature and high-pressure rubber cylinder 210, a temperature and pressure sensor 212, trays of the simulator 213, a fluid inlet 214, a bottom cap of the core kettle 215, a simulator base 217, a core kettle 218. Wherein, the trays of the simulator 213 are divided into three layers, i.e., the upper, the middle, and the lower layers, all of which are respectively fixedly connected to the simulator base 217. In addition, the bottom cap of the core kettle 215 is arranged on the tray located on the lowest layer of the simulator 213. Meanwhile, the core kettle 218 adopts hollow cylindrical structure, and the lower end is threadedly connected to the bottom cap of the core kettle 215. Moreover, the outside wall of the core kettle 218 is fixedly connected to the tray located on the middle layer of the simulator 213, and there is a fluid inlet 214 is arranged on the lower part of the outside wall of the core kettle 218, as well as there is an annular seal is arranged between the fluid inlet 214 and the outside wall of the core kettle 218. Furthermore, the plug 28 is fixed on the top of the core kettle 218. The high-temperature and high-pressure rubber cylinder 210 is installed inside the core kettle 218. The inside wall of the core kettle 218 and the outside wall of the high-temperature and high-pressure rubber cylinder 210 form an annular space that can apply confining pressure, and there are electric heater 29 and temperature and pressure sensor 212 are arranged inside the annular space to heat the test core 216 and measure the temperature and the confining pressure of the core kettle 218 under the experimental conditions. Meanwhile, the test core 216 is an artificial core with hollow cylinder structure, and the test core 216 is fixed inside the cylindrical space formed by the inside wall of the high-temperature and high-pressure rubber cylinder 210, the bottom cap of the core kettle 215, and the plug 28. The rotating vertical shaft adopts a hollow tubular column, and there is a rotation speed controller 23 is installed on the upper end of the rotating vertical shaft, meanwhile, the lower end passes through the plug 28 and is arranged in the internal cavity of the test core 216, and the upper end of the rotating vertical shaft 25 is connected to 8 the outlet of the plugging fluid 16 of the plugging fluid storage tank 1, as well as there is a LU500068 rotating seal 27 is equipped between the rotating vertical shaft 25 and the plug 28. Furthermore, the back pressure pipeline 24 passes through the plug 28, and one end of the back pressure pipeline is connected to the internal cavity of the test core 216, and the other end is equipped with a back pressure valve 26, which is used to control the pressure of the annular space formed between the rotating vertical shaft 25 and the inside wall of the test core
216. In addition, there is an annular seal is arranged between the back pressure pipeline 24 and the plug 28, and the tool of leak resistance and plugging while drilling 211 is threadedly connected to the lower end of the rotating vertical shaft 25; Furthermore, there is a pressure sensor 21, which is used to measure the pressure of the plugging fluid flowing in the core kettle 218, is located at the upper end of the rotating vertical shaft 25. Meanwhile, the three- phase motor 22 is connected to the rotation speed control system 23, and is fixedly installed on the tray located on the uppermost layer of the simulator 213. Embodiment 2 The test device for leakage prevention and plugging while drilling of this embodiment is developed based on the embodiment 1, wherein, the said control and measurement system consists of: an oil hydraulic pump, which is connected to the oil inlet, and the said oil hydraulic pump is connected with an oil pressure measuring device which is used to measure oil pressure entering in the upper part of the fluid storage tank; and a pump pressure measuring device, which is connected to the pressure sensor to measure the pressure of the plugging fluid flowing in the core kettle; and a confining pressure pump, which is connected to the fluid inlet and used to provide confining pressure to the test core equipped in the plugging simulator, and a confining pressure measuring device, which is used to measure the confining pressure of the test; and a temperature measuring device, which is connected to the temperature and pressure sensor arranged in the plugging simulator and used to measure the temperature of the test; as well as a speed regulation device, which is connected to the three-phase motor of the plugging simulator, wherein, there are a rotation speed measuring device, which is used to measure the rotation speed of the rotating vertical shaft, and a drilling speed measuring device, which is used to measure the lowering speed of the rotating vertical shaft, are equipped on the speed regulation device.
The control and measurement system 3 consists of an oil pressure pump 34, an oil pressure measuring device 35, a pump pressure measuring device 36, a confining pressure pump 31, a confining pressure measuring device 32, a temperature measuring device 33, a speed regulation device 37, a rotation speed measuring device 38, a drilling speed measuring equipment 39. Wherein, there is an oil pressure measuring device 35 is installed on the oil pressure pump 34, which is used to measure the oil pressure entering the upper space of the plugging fluid storage tank 1, and the oil pressure pump 34 is connected to the oil inlet 12; in 9 addition, the pump pressure measuring device 36 is connected to the data analysis and LU500068 processing system 4 and the pressure sensor 21, which is used to measure the pressure of the plugging fluid flowing the core kettle 218. Meanwhile, the confining pressure pump 31 is connected to the fluid inlet 214, which is used to provide confining pressure to the test core 216 located in the plugging simulator 2, and the confining pressure measuring device 32 and the temperature measuring device 33 are connected to the temperature and pressure sensor 214 installed in the data analysis and processing system 4 and the plugging simulator 2, which is used to measure the temperature and confining pressure of the test. Furthermore, there are rotation speed measuring device 38 and drilling speed measuring device 39 are installed on the speed regulation device 37, and the rotation speed measuring device 38 and drilling speed measuring device 39 are connected to the three-phase motor 22 of the plugging simulator 2, which are used to measure the rotation speed and the lowering speed of the rotating vertical shaft 25.
Embodiment 3 The test device for leakage prevention and plugging while drilling of this embodiment is developed based on the embodiment 2, wherein, it further consists of a data analysis and processing system, which is connected to the said oil pressure measuring device, the pump pressure measuring device, the confining pressure measuring device, the temperature measuring device, the rotation speed measuring device, and the drilling speed measuring device and used to obtain corresponding data of the measurement test and complete subsequent analysis and processing operation. The said data analysis and processing system consists of a computer and related software.
In the aforesaid embodiments, in order to prevent oil leakage, there is a rotating seal is equipped between the said rotating vertical shaft and the plug; and there are annular seals are equipped between the said outlet of the plugging fluid and the outer cylinder of the storage tank, and between the oil inlet and the top cap of the storage tank, between the back pressure pipeline and the plug, as well as between the fluid inlet and the outside wall of the core kettle respectively.
The working principles of the foregoing embodiments are as follows: At the beginning of the test, pour the prepared plugging drilling fluid system into the plugging fluid storage tank 1 firstly, and install the piston 11 and the top cap of the storage tank 13. Then, assemble the rotating vertical shaft connected 25 with the tool of leak resistance and plugging while drilling 210 and the plug 28; and then place the prepared (or sampling of the leakage formation) test core 216 in the high-temperature and high-pressure rubber cylinder 210 of the plugging simulator 2. After that, install the assembled plug 28 with the rotating vertical shaft 25 and back pressure pipeline 24 on the top of the core kettle 218, and then fix the test core 216 through utilizing the high-temperature and high-pressure rubber 10 cylinder 210, the plug 28 and the bottom cap of the core kettle 215. Then, install the pressure LU500068 sensor on the top of the rotating vertical shaft 25, and then install the temperature and pressure sensor on the bottom of the core kettle 28, and connect relevant lines and pipelines; After that, turn on the control and measurement system 3 and the data analysis and processing system 4, wherein, the computer sets up the temperature and confining pressure required for the test, and then, turn on the confining pressure pump 31, as well as inject hydraulic oil into the annular space between the high-temperature and high-pressure rubber cylinder 210 and the core kettle 218 to apply confining pressure to the test core; meanwhile, turn on the electric heater 29 to heat up the test core 216. When the values of temperature-pressure and temperature reach the required values, turn on the three-phase motor 22 and the speed regulation device 37, and then set the rotation speed and lowering speed of the rotating vertical shaft 25; meanwhile, set the displacement oil pressure, and turn on the oil pressure pump 34, at that time, the hydraulic oil pushes the piston 13 down to displace the plugging drilling fluid in the plugging fluid storage tank 1 and drive it to flow into the rotating vertical shaft 25, and then the plugging drilling fluid would be sprayed out through the lateral nozzle of the tool of leak resistance and plugging while drilling 211. With the continuous rotation and lowering of the rotating vertical shaft 25, the plugging drilling fluid forms an “artificial core” on the inside wall of the test core 216 to complete the plugging process. During the whole process, the oil pressure measuring device 35, the pump pressure measuring device 36, the confining pressure measuring device 32, the temperature measuring device 33, the rotation speed measuring device 38, and the drilling speed measuring device 39 equipped in the control and measurement system 3 can record and store relevant data for completing analysis in subsequent experiments.
Embodiment 4 The test method for leakage prevention and plugging while drilling of this embodiment adopts the said test device for leak resistance and plugging while drilling of aforesaid embodiment to conduct the test, wherein: Pour the prepared plugging drilling fluid system into the plugging fluid storage tank, and install the piston and the top cap of the storage tank; Assemble the rotating vertical shaft connected with the tool of leak resistance and plugging while drilling and the plug; and then place the prepared test core in the high- temperature and high-pressure rubber cylinder of the plugging simulator; Install the assembled plug with the rotating vertical shaft and back pressure pipeline on the top of the core kettle, and then fix the test core through utilizing the high-temperature and high-pressure rubber cylinder, the plug and the bottom cap of the core kettle; 11
Install the pressure sensor on the top of the rotating vertical shaft, and then install the LU500068 temperature and pressure sensor on the bottom of the core kettle, and connect relevant lines and pipelines; Turn on the control and measurement system and the data analysis and processing system, wherein, the computer sets up the temperature and confining pressure required for the test, after that, turn on the confining pressure pump, and then inject hydraulic oil into the annular space between the high-temperature and high-pressure rubber cylinder and the core kettle to apply confining pressure to the test core; meanwhile, turn on the electric heater to heat up the test core; When the values of temperature-pressure and temperature reach the required values, turn on the three-phase motor and the speed regulation device, and then set the rotation speed and lowering speed of the rotating vertical shaft; meanwhile, set the displacement oil pressure, and turn on the oil pressure pump, at that time, the hydraulic oil pushes the piston down to displace the plugging drilling fluid in the plugging fluid storage tank and drive it to flow into the rotating vertical shaft, and then the plugging drilling fluid would be sprayed out through the lateral nozzle of the tool of leak resistance and plugging while drilling; With the continuous rotation and lowering of the rotating vertical shaft, the plugging drilling fluid forms an “artificial core” on the inside wall of the test core to complete the plugging process; During the whole process, the oil pressure measuring device, the pump pressure measuring device, the confining pressure measuring device, the temperature measuring device, the rotation speed measuring device, and the drilling speed measuring device equipped in the control and measurement system 3 can record and store relevant data.
The above are only the preferred embodiments of the present invention rather than imposing restrictions on the present invention. It should be pointed out that for those of ordinary skill in the prior art, various improvements and variations can be made without departing from the technical principles of the present invention, and these improvements and variations shall fall within the protection scope of the present invention.
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Claims (8)
1. A test device for leak resistance and plugging while drilling, characterized in that consisting of a plugging fluid storage tank which is used to store the plugging fluid, a plugging simulator which is connected to the outlet of the plugging fluid, and a control and measurement system which is used to control and record the operation status of the plugging simulator, The said plugging simulator consists of a simulator base, trays of the simulator arranged on the simulator base, and the body of the plugging simulator arranged on the said trays of the simulator, wherein, the said body of the plugging simulator consists of a core kettle with hollow cylinder structure, and there is a bottom cap of the core kettle is connected to the lower open end of the said core kettle, as well as there is a plug is arranged on the upper open end of the said core kettle, in addition, there is a fluid inlet is arranged on the lower part of the said core kettle; Furthermore, there is a high-temperature and high-pressure rubber cylinder is arranged inside the said core kettle, wherein, the test core is an artificial core with hollow cylinder structure, and the test core is fixed inside the cylindrical space formed by the inside wall of the high-temperature and high-pressure rubber cylinder, the bottom cap of the core kettle, and the plug; in addition, the inside wall of the said core kettle and the outside wall of the high-temperature and high-pressure rubber cylinder form an annular space that can apply confining pressure, and there are electric heater and temperature and pressure sensor are arranged inside the annular space to heat the test core and measure the temperature and the confining pressure of the core kettle under the experimental conditions; moreover, there are a rotating mechanism and a back pressure pipeline are arranged on the plug, and the said rotating mechanism consists of a rotating vertical shaft with hollow tubular column structure, and there is a rotation speed controller is installed on the upper end of the said rotating vertical shaft, meanwhile, the lower end of the said rotating vertical shaft passes through the plug and is arranged in the internal cavity of the test core, and the upper end of the rotating vertical shaft is connected to the outlet of the plugging fluid of the plugging fluid storage tank, as well as there is a rotating seal is equipped between the rotating vertical shaft and the plug; in addition, the tool of leak resistance and plugging while drilling is threadedly connected to the lower end of the rotating vertical shaft, and the pressure sensor used to measure the pressure of the plugging fluid flowing in the core kettle is located at the upper end of the rotating vertical shaft; and the said back pressure pipeline passes through the plug, and one end of the back pressure pipeline is connected to the internal cavity of the test core, and the other end is equipped with a back pressure valve which is used to control the pressure of the annular space formed between the rotating vertical shaft and the inside wall of the test core.
2. The said test device for leak resistance and plugging while drilling according to Claim 1, characterized in that the said control and measurement system consists of: an oil hydraulic 13 pump, which is connected to the oil inlet, and the said oil hydraulic pump is connected with an LU500068 oil pressure measuring device which is used to measure oil pressure entering in the upper part of the fluid storage tank; and a pump pressure measuring device, which is connected to the pressure sensor to measure the pressure of the plugging fluid flowing in the core kettle; and a confining pressure pump, which is connected to the fluid inlet and used to provide confining pressure to the test core equipped in the plugging simulator; and a confining pressure measuring device, which is used to measure the confining pressure of the test; and a temperature measuring device, which is connected to the temperature and pressure sensor arranged in the plugging simulator and used to measure the temperature of the test; as well as a speed regulation device, which is connected to the three-phase motor of the plugging simulator, wherein, there are a rotation speed measuring device, which is used to measure the rotation speed of the rotating vertical shaft, and a drilling speed measuring device, which is used to measure the lowering speed of the rotating vertical shaft, are equipped on the speed regulation device.
3. The said test device for leak resistance and plugging while drilling according to Claim 2, characterized in that it further consists of a data analysis and processing system, which is connected to the said oil pressure measuring device, the pump pressure measuring device, the confining pressure measuring device, the temperature measuring device, the rotation speed measuring device, and the drilling speed measuring device and used to obtain corresponding data of the measurement test and complete subsequent analysis and processing operation.
4. The said test device for leak resistance and plugging while drilling according to Claim 1, characterized in that the said trays of the simulator are divided into three layers: i.e., the upper, the middle and the lower layers, wherein, the bottom cap of the core kettle is arranged on the tray located on the lowest layer of the simulator, and the outside wall of the core kettle is fixedly connected to the tray located on the middle layer of the simulator, and the three- phase motor is connected to the rotation speed control system, and is fixedly installed on the tray located on the uppermost layer of the simulator.
5. The said test device for leak resistance and plugging while drilling according to Claim 1, characterized in that the said plugging fluid storage tank consists of an outer cylinder of the storage tank, and there is a top cap of the storage tank is arranged on the upper open end of the said outer cylinder of the storage tank, meanwhile, there is a bottom cap of the storage tank is arranged on the lower open end of the said outer cylinder of the storage tank, in addition, there is a piston of the storage tank is arranged in the said outer cylinder of the storage tank, and there is a fluid inlet is arranged on the said top cap of the storage tank, as 14 well as there is an outlet of the plugging fluid is arranged at the lower part of the said outer LU500068 cylinder of the storage tank.
6. The said test device for leak resistance and plugging while drilling according to Claim 1, characterized in that the said top cap of the storage tank is threadedly connected to the said outer cylinder of the storage tank, and there is a storage tank base is threadedly connected to the said bottom cap of the storage tank.
7. The said test device for leak resistance and plugging while drilling according to Claim 1, characterized in that there is a rotating seal is equipped between the said rotating vertical shaft and the plug; and there are annular seals are equipped between the said outlet of the plugging fluid and the outer cylinder of the storage tank, and between the oil inlet and the top cap of the storage tank, between the back pressure pipeline and the plug, as well as between the fluid inlet and the outside wall of the core kettle respectively.
8. A test device for leak resistance and plugging while drilling, characterized in that adopting the said test device for leak resistance and plugging while drilling of any one of Claims 1 to 7 to complete the test, wherein: Pour the prepared plugging drilling fluid system into the plugging fluid storage tank, and install the piston and the top cap of the storage tank; Assemble the rotating vertical shaft connected with the tool of leak resistance and plugging while drilling and the plug; and then place the prepared test core in the high- temperature and high-pressure rubber cylinder of the plugging simulator, Install the assembled plug with the rotating vertical shaft and back pressure pipeline on the top of the core kettle, and then fix the test core through utilizing the high-temperature and high-pressure rubber cylinder, the plug and the bottom cap of the core kettle, Install the pressure sensor on the top of the rotating vertical shaft, and then install the temperature and pressure sensor on the bottom of the core kettle, and connect relevant lines and pipelines; Turn on the control and measurement system and the data analysis and processing system, wherein, the computer sets up the temperature and confining pressure required for the test, after that, turn on the confining pressure pump, and then inject hydraulic oil into the annular space between the high-temperature and high-pressure rubber cylinder and the core kettle to apply confining pressure to the test core; meanwhile, turn on the electric heater to heat up the test core; When the values of temperature-pressure and temperature reach the required values, turn on the three-phase motor and the speed regulation device, and then set the rotation speed and lowering speed of the rotating vertical shaft; meanwhile, set the displacement oil pressure, 15 and turn on the oil pressure pump, at that time, the hydraulic oil pushes the piston down to LU500068 displace the plugging drilling fluid in the plugging fluid storage tank and drive it to flow into the rotating vertical shaft, and then the plugging drilling fluid would be sprayed out through the lateral nozzle of the tool of leak resistance and plugging while drilling;
With the continuous rotation and lowering of the rotating vertical shaft, the plugging drilling fluid forms an “artificial core” on the inside wall of the test core to complete the plugging process;
During the whole process, the oil pressure measuring device, the pump pressure measuring device, the confining pressure measuring device, the temperature measuring device, the rotation speed measuring device, and the drilling speed measuring device equipped in the control and measurement system 3 can record and store relevant data. 16
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| LU500068A LU500068B1 (en) | 2021-04-21 | 2021-04-21 | A Test Device for Leak Resistance and Plugging While Drilling and Its Method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| LU500068A LU500068B1 (en) | 2021-04-21 | 2021-04-21 | A Test Device for Leak Resistance and Plugging While Drilling and Its Method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| LU500068B1 true LU500068B1 (en) | 2021-10-21 |
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ID=78293825
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| LU500068A LU500068B1 (en) | 2021-04-21 | 2021-04-21 | A Test Device for Leak Resistance and Plugging While Drilling and Its Method |
Country Status (1)
| Country | Link |
|---|---|
| LU (1) | LU500068B1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117468888A (en) * | 2023-12-27 | 2024-01-30 | 中国石油集团川庆钻探工程有限公司 | Underground airtight plugging tool and plugging method |
-
2021
- 2021-04-21 LU LU500068A patent/LU500068B1/en active IP Right Grant
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117468888A (en) * | 2023-12-27 | 2024-01-30 | 中国石油集团川庆钻探工程有限公司 | Underground airtight plugging tool and plugging method |
| CN117468888B (en) * | 2023-12-27 | 2024-03-19 | 中国石油集团川庆钻探工程有限公司 | Underground airtight plugging tool and plugging method |
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| Date | Code | Title | Description |
|---|---|---|---|
| FG | Patent granted |
Effective date: 20211021 |