Shaft simulation device for thrust test of vertical drilling tool

Abstract

The invention relates to the technical field of petroleum and natural gas well cementation tools, in particular to a wellbore simulation device for a thrust test of a vertical drilling tool, and aims to solve the problem that the drilling efficiency is reduced due to the fact that bit pressure is reduced in order to guarantee the stability of the vertical drilling tool. The device comprises a shaft simulation system, a circulating oil charging system and a thrust monitoring system, the shaft simulation system comprises a heating cylinder, an annular oil storage space with two closed ends is defined by the pushing type vertical drilling tool and the heating cylinder, and the heating cylinder is used for heating liquid in the annular oil storage space; the circulating oil charging system is communicated with the pushing type vertical drilling tool to form a circulating loop; the thrust monitoring system includes a thrust sensor. By simulating the underground working environment and detecting the thrust through the thrust monitoring system, the drilling pressure allowed by the vertical drilling tool to keep stable work under different temperature conditions and the pressure required for balancing the drilling pressure are obtained, and therefore reliable data support is provided for increasing the drilling speed.

Description

Technical Field

[0001] The invention relates to the technical field of oil and natural gas cementing tools, and in particular to a wellbore simulation device for thrust testing of vertical drilling tools. Background Art

[0002] In the process of drilling for petroleum or geological exploration, it is often encountered that deep wells and ultra-deep wells are drilled under complex geological conditions such as large formation dip angles, high and steep structural belts, and piedmont overthrust nappe areas. Especially when drilling deep exploration wells, ultra-deep exploration wells, and the first pre-exploration wells and exploration wells in the region, it is generally required to prevent deflection, drill fast, and be safe and low-cost. However, when drilling deep wells in complex and easily inclined formations, drilling in high and steep structures, or formations with abnormal ground stress, the drill bit will deviate from the normal vertical axis of the wellbore trajectory and cause well deviation under the combined effects of formation dip angles, ground stress, and drilling pressure. Well deviation often brings great risks to subsequent drilling, logging, and completion operations, such as difficulties in pulling out drilling tools, casing, or logging instruments, and accidents such as stuck drills are very likely to occur. In severe cases, it may even lead to the scrapping of the oil well. In order to prevent the occurrence of well deviation, drilling pressure is usually controlled within a low range for drilling, which seriously restricts the improvement of drilling efficiency.

[0003] The emergence of vertical drilling tools has achieved the control of wellbore trajectory and effectively prevented the occurrence of well deviation. However, with the increasing number of deep wells and ultra-deep wells, vertical drilling tools have also begun to be used in deep formations. The temperature and pressure of deep formations have put forward higher requirements for vertical drilling tools. In the application, the working performance of the tools has gradually become unstable due to the influence of temperature, especially the push-to-pull vertical drilling tools, which are mechanical, electrical and hydraulic integrated structure designs. The stability of the liquid plays a vital role in the correction ability and stability of vertical drilling tools. The existing technology usually ensures the stability of vertical drilling tools by reducing the drilling pressure, resulting in reduced drilling efficiency. Summary of the invention

[0004] The purpose of the present invention is to provide a wellbore simulation device for thrust testing of vertical drilling tools, so as to solve the problem that drilling efficiency is reduced due to lowering drilling pressure to ensure the stability of the vertical drilling tool.

[0005] In order to solve the above technical problems, the technical solution provided by the present invention is:

[0006] A wellbore simulation device for thrust testing of a vertical drilling tool comprises a wellbore simulation system, a circulating oil filling system and a thrust monitoring system; the wellbore simulation system comprises a heating tube, a push-type vertical drilling tool is inserted into the heating tube and forms an annular oil storage space with closed ends with the heating tube, and the heating tube is used to heat the liquid in the annular oil storage space; the circulating oil filling system is connected to the push-type vertical drilling tool, and the outlet and inlet of the circulating oil filling system are respectively connected to the internal space of the push-type vertical drilling tool to form a circulation loop; the thrust monitoring system comprises a thrust sensor and an elastic telescopic rod, and a plurality of thrust sensors are arranged around the axis of the push-type vertical drilling tool; one end of the elastic telescopic rod is connected to the wellbore simulation system, and the other end is connected to the thrust sensor, and is configured to be telescopic along the radial direction of the push-type vertical drilling tool.

[0007] Furthermore, the wellbore simulation system also includes an insulation tube, an outer tube, an upper sealing cover and a lower sealing cover; the insulation tube is mounted on the heating tube, and the outer tube is mounted on the insulation tube; the upper sealing cover and the lower sealing cover are respectively connected to the two ends of the outer tube; the upper sealing cover and the lower sealing cover are respectively connected to the two ends of the heating tube to close the two ends of the annular oil storage space.

[0008] Furthermore, the wellbore simulation system also includes a temperature and pressure sensor. The two temperature and pressure sensors are respectively installed on the upper sealing cover and the lower sealing cover to detect the liquid temperature and pressure in the annular oil storage space.

[0009] Furthermore, the heating tube is configured to heat in sections along the axial direction.

[0010] Furthermore, the elastic telescopic rod includes a mounting seat, a spring and a sliding rod; the mounting seat is installed in the wellbore simulation system, one end of the sliding rod is inserted into the mounting seat and is slidably connected to the mounting seat, and the other end is connected to the thrust sensor; the spring is sleeved on the sliding rod, one end is connected to the mounting seat, and the other end is connected to the sliding rod, and is configured to apply thrust to the sliding rod to make the thrust sensor contact with the push-type vertical drilling tool.

[0011] Furthermore, the circulating oil filling system includes an oil storage tank, a circulating pump, a buffer tank and a vacuum pump; the oil storage tank is used to store hydraulic oil, the oil storage tank, the circulating pump and the internal space of the push-type vertical drilling tool are connected in series, and the circulating pump is used to send the hydraulic oil in the oil storage tank into the internal space of the push-type vertical drilling tool and return to the oil storage tank; the buffer tank is connected to the oil storage tank, and the vacuum pump is connected to the buffer tank; the vacuum pump evacuates the buffer tank to allow the air in the hydraulic oil to be discharged through the buffer tank and the vacuum pump.

[0012] Furthermore, the circulating oil filling system also includes a first switch valve, which is arranged between the outlet of the internal space of the push-type vertical drilling tool and the oil storage tank.

[0013] Furthermore, the circulating oil filling system also includes a spray branch, the two ends of the spray branch are respectively connected to the oil storage tank and the circulating pump, and the outlet of the spray branch is arranged in the oil storage tank; a spray head is arranged at the outlet of the spray branch for spraying hydraulic oil onto the inner wall of the oil storage tank; the circulating pump extracts the hydraulic oil in the oil storage tank and sprays it onto the inner wall of the oil storage tank through the spray branch.

[0014] Furthermore, the circulating oil filling system also includes filters. Two filters are respectively arranged between the circulating pump and the internal space of the push-type vertical drilling tool and between the oil storage tank and the internal space of the push-type vertical drilling tool to filter bubbles in the hydraulic oil.

[0015] Furthermore, the wellbore simulation device for thrust testing of vertical drilling tools also includes a parameter monitoring and control system, which includes a thrust monitoring and control terminal and a temperature and pressure monitoring and control terminal; the temperature and pressure monitoring and control terminal is connected to the temperature and pressure sensor to obtain the temperature and pressure parameters of the liquid in the oil storage space and regulate the temperature of the liquid, and at the same time transmits the pressure parameters to the circulating oil filling system; the thrust monitoring and control terminal is connected to the thrust sensor and transmits the monitored thrust data to the circulating oil filling system, and the circulating oil filling system automatically adjusts the amount of oil filled into the internal space of the push-type vertical drilling tool by the circulating oil filling system according to the changes in thrust and the pressure of the liquid in the oil storage space.

[0016] Based on the above technical solutions, the technical effects that can be achieved by the present invention are:

[0017] The wellbore simulation device for thrust testing of a vertical drilling tool provided by the present invention comprises a wellbore simulation system, a circulating oil filling system and a thrust monitoring system; the wellbore simulation system comprises a heating cylinder, a push-type vertical drilling tool is inserted into the heating cylinder and forms an annular oil storage space with closed ends with the heating cylinder, and the heating cylinder is used to heat the liquid in the annular oil storage space; the circulating oil filling system is connected to the push-type vertical drilling tool, and the outlet and inlet of the circulating oil filling system are respectively connected to the internal space of the push-type vertical drilling tool to form a circulation loop; the thrust monitoring system comprises a thrust sensor and an elastic telescopic rod, and a plurality of thrust sensors are arranged around the axis of the push-type vertical drilling tool; one end of the elastic telescopic rod is connected to the wellbore simulation system, and the other end is connected to the thrust sensor, and is configured to be telescopic along the radial direction of the push-type vertical drilling tool.

[0018] The wellbore simulation device for vertical drilling tool thrust testing provided by the present invention simulates the working environment of deep wells and ultra-deep wells, and detects the thrust through a thrust monitoring system to obtain the drilling pressure allowed for the vertical drilling tool to maintain stable operation under different temperature conditions, as well as the pressure required to balance the drilling pressure, thereby providing reliable data support for improving the drilling speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A schematic diagram of the structure of a wellbore simulation device for vertical drilling tool thrust testing provided by an embodiment of the present invention;

[0021] Figure 2 Schematic diagram of the thrust monitoring system.

[0022] Icons: 110-heating cylinder; 120-insulating cylinder; 130-outer cylinder; 140-upper sealing cover; 150-lower sealing cover; 160-temperature and pressure sensor; 210-oil storage tank; 220-circulating pump; 230-filter; 240-sprinkler head; 250-buffer tank; 260-vacuum pump; 270-vacuum pressure gauge; 280-liquefaction unit; 20a-first switch valve; 20b-second switch valve; 20c-third switch valve; 20d-fourth switch valve; 310-thrust sensor; 320-elastic telescopic rod; 321-mounting seat; 322-spring; 323-sliding rod; 410-thrust monitoring and control terminal; 420-temperature and pressure monitoring and control terminal; a-annular oil storage space; 10-push-type vertical drilling tool; 11-piston. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0026] With the increasing number of deep and ultra-deep wells, vertical drilling tools have also begun to be used in deep formations. In the application, the working performance of the tools has gradually become unstable due to the influence of temperature. The stability of the vertical drilling tools is usually ensured by reducing the drilling pressure, which leads to reduced drilling efficiency.

[0027] In view of this, the present invention provides a wellbore simulation device for thrust testing of a vertical drilling tool, comprising a wellbore simulation system, a circulating oil filling system and a thrust monitoring system; the wellbore simulation system comprises a heating tube 110, a push-type vertical drilling tool 10 is inserted into the heating tube 110 and forms an annular oil storage space a with closed ends with the heating tube 110, and the heating tube 110 is used to heat the liquid in the annular oil storage space a; the circulating oil filling system is connected to the push-type vertical drilling tool 10, and the outlet and inlet of the circulating oil filling system are respectively connected to the internal space of the push-type vertical drilling tool 10 to form a circulation loop; the thrust monitoring system comprises a thrust sensor 310 and an elastic telescopic rod 320, and a plurality of thrust sensors 310 are arranged around the axis of the push-type vertical drilling tool 10; one end of the elastic telescopic rod 320 is connected to the wellbore simulation system, and the other end is connected to the thrust sensor 310, and is configured to be retractable along the radial direction of the push-type vertical drilling tool 10.

[0028] The wellbore simulation device for thrust testing of vertical drilling tools provided by the present invention simulates the working environment of deep wells and ultra-deep wells, and detects the thrust through a thrust monitoring system to obtain the thrust force allowed for the vertical drilling tool to maintain stable operation under different temperature conditions, as well as the system fluid pressure required to balance the thrust force, thereby providing reliable data support for improving the drilling speed.

[0029] The following combination Figure 1-Figure 2 The structure and shape of the wellbore simulation device for vertical drilling tool thrust testing provided in this embodiment are described in detail:

[0030] The wellbore simulation device for vertical drilling tool thrust testing provided in this embodiment includes a wellbore simulation system, a circulating oil filling system, a thrust monitoring system and a parameter monitoring and control system.

[0031] Specifically, Figure 1As shown, the wellbore simulation system includes a heating cylinder 110, an insulation cylinder 120, an outer cylinder 130, an upper sealing cover 140, a lower sealing cover 150 and a temperature and pressure sensor 160. Among them, the push-to-pull type vertical drilling tool 10 is inserted into the heating cylinder 110 and encloses an annular oil storage space a with closed ends with the heating cylinder 110, and the annular oil storage space a is filled with hydraulic oil. The insulation cylinder 120 is mounted on the heating cylinder 110, and the outer cylinder 130 is mounted on the insulation cylinder 120; the upper sealing cover 140 and the lower sealing cover 150 are respectively connected to the two ends of the outer cylinder 130, and the upper sealing cover 140 and the lower sealing cover 150 are respectively connected to the two ends of the heating cylinder 110, so as to close the two ends of the annular space enclosed by the push-to-pull type vertical drilling tool 10 and the heating cylinder 110 to form an annular oil storage space a. The upper sealing cover 140 and the lower sealing cover 150 are both annular structures to facilitate the installation of the push-type vertical drilling tool 10; and the upper sealing cover 140, the lower sealing cover 150 are connected to the outer tube 130 and the heating tube 110 by screws to facilitate the replacement of upper sealing covers 140 and lower sealing covers 150 of different specifications to match push-type vertical drilling tools 10 of different specifications.

[0032] Two temperature and pressure sensors 310 are respectively installed on the upper sealing cover 140 and the lower sealing cover 150, and are used to detect the liquid temperature and pressure in the annular oil storage space a; the insulation tube 120 can be made of polyurethane material, and its function is to reduce heat loss and avoid large temperature fluctuations, thereby helping to maintain a constant temperature of the hydraulic oil in the annular oil storage space a; the outer tube 130 is used to isolate heat to prevent damage to the operator due to heat transfer to the outside. In this embodiment, the annular oil storage space a can contain water or oil, but water will boil at high temperatures, which is risky and not conducive to the accuracy of the experiment, so oil is preferably used. Specifically, a hydraulic oil with stable performance is used to fill the annular oil storage space a to simulate the liquid in the wellbore.

[0033] In this embodiment, the heating cylinder 110 is configured to heat in sections along the axial direction. Flexible control can be achieved through multi-section heating. The heating is performed according to the temperature change of the hydraulic oil in the annular oil storage space a to ensure that the temperature of the hydraulic oil is consistent and avoid temperature differences along the axial direction of the heating cylinder 110. At this time, multiple temperature sensors can be set according to the heating sections to ensure consistent temperatures. The temperature and pressure sensors 160 located at both ends of the annular oil storage space a can be used to detect whether the temperatures at both ends are consistent.

[0034] In this embodiment, the circulating oil filling system is used to fill the internal space of the push-type vertical drilling tool 10 with hydraulic oil and discharge the air in the pipeline at the beginning of the experiment. After the temperature in the annular oil storage space a rises to a set state, the circulating oil filling system continues to fill oil to provide the system hydraulic pressure required by the vertical drilling tool. Specifically, the circulating oil filling system includes an oil supply branch, an oil inlet branch, an oil outlet branch, a spray branch, a vacuum branch and an oil return branch. The oil supply branch, the oil inlet branch, the internal space of the push-type vertical drilling tool 10, and the oil outlet branch are connected end to end to form a circulation loop, and the push-type vertical drilling tool 10 is connected to the oil inlet pipe and the oil outlet pipe through a quick-connect connector.

[0035] In this embodiment, Figure 1 As shown, the oil supply branch includes an oil storage tank 210, a circulation pump 220, a filter 230 and a vacuum pressure gauge 270 installed behind the filter 230, which are connected in sequence. A switch valve is arranged between the oil storage tank 210 and the circulation pump 220 for easy maintenance and repair; the circulation pump 220 uses an adjustable speed circulation pump 220, which can adjust the oil filling speed smoothly and without pulsation according to the changes in temperature and the thrust of the drilling tool. The oil inlet branch includes a third switch valve 20c, one end of which is connected to the inlet of the internal space of the push-type vertical drilling tool 10, and the other end is connected to the outlet of the oil supply branch. The oil outlet branch includes a filter 230 and a first switch valve 20a connected in series, one end of the oil outlet branch is connected to the outlet of the internal space of the push-type vertical drilling tool 10, and the other end is connected to the oil storage tank 210. A vacuum pressure gauge 270 is also arranged between the filter 230 and the outlet of the internal space of the push-type vertical drilling tool 10. Among them, two vacuum pressure gauges 270 are respectively installed between the circulation pump 220 and the internal space of the push-type vertical drilling tool 10 and between the oil storage tank 210 and the internal space of the push-type vertical drilling tool 10, so as to detect the vacuum degree of the hydraulic oil at the inlet and outlet of the internal space of the push-type vertical drilling tool 10, that is, the vacuum pressure gauge 270 is used to monitor in real time whether there is gas in the circulation pipeline; the filter 230 can filter and remove residual bubbles in the hydraulic oil, and the filter 230 can use a medium-pressure filter with high-quality fatigue pressure characteristics.

[0036] In this embodiment, the spray branch includes a second switch valve 20b and a spray head 240 connected in series. The spray head 240 is arranged in the oil storage tank 210 and is used to spray hydraulic oil to the inner wall of the oil storage tank 210, that is, the two ends of the spray branch are respectively connected to the two ends of the oil supply branch. Specifically, the spray head 240 can be provided with a plurality of nozzles, and the second switch valve 20b can be set as a pressure reducing valve. The vacuum branch includes a buffer tank 250 and a vacuum pump 260 connected in sequence. One end of the buffer tank 250 is connected to the oil storage tank 210, and the other end is connected to the vacuum pump 260. A liquefaction unit 280 is arranged in the buffer tank 250, and the liquefaction unit 280 can be set as a spray pump. Specifically, the upper part of the oil storage tank 210 becomes a vacuum state under the action of the vacuum pump 260, and the lower part stores hydraulic oil. The spray head 240 is located at the upper part of the oil storage tank 210. The oil storage tank 210 and the buffer tank 250 are connected by a pipeline, and both ends of the pipeline are connected to the upper ends of the oil storage tank 210 and the buffer tank 250. Figure 1 As shown. The spray head 240 can spray the hydraulic oil to the inner wall of the oil storage tank 210 to strengthen the separation of gas and liquid and exhaust the air as soon as possible. After the hydraulic oil adheres to the inner wall, it is conducive to the rupture of bubbles under the action of tension; the vacuum pump 260 is used to create a vacuum and exhaust the separated air; the spray pump can spray the oil entering the buffer tank 250 to separate the gas and liquid, so as to facilitate the recovery of the hydraulic oil after the experiment is completed and the next use. It should be noted that due to the action of the spray head 240 and the like, when the hydraulic oil enters the oil storage tank 210, it will partially enter the buffer tank 250 due to the pressure difference and be stored at the bottom of the buffer tank 250.

[0037] In this embodiment, the oil return branch includes a fourth switch valve 20d, one end of the oil return branch is connected to the oil inlet branch, and the other end is connected to the oil storage tank 210.

[0038] The circulating oil filling system can continuously remove the gas in the hydraulic oil during the oil filling process, maintain the vacuum degree of the hydraulic oil to avoid the formation of bubbles, and ensure the normal operation of the hydraulic system. Its working process is as follows:

[0039] At the beginning of the experiment, the circulation pump 220 and the vacuum pump 260 start working, the first switch valve 20a, the second switch valve 20b, and the third switch valve 20c are opened, and the fourth switch valve 20d is closed. Under the action of the circulation pump 220, the hydraulic oil enters the circulation pump 220 from the oil storage tank 210 and passes through the filter 230 and the vacuum pressure gauge 270 in sequence. After passing through the vacuum pressure gauge 270, the hydraulic oil is divided into two parts, which enter the oil inlet branch and the spray branch respectively, that is, one part of the hydraulic oil passes through the third switch valve 20c, the inlet of the internal space of the push-type vertical drilling tool 10, the outlet of the internal space of the push-type vertical drilling tool 10, the vacuum pressure gauge 270, the filter 230, and the first switch valve 20a in sequence and then returns to the oil storage tank 210; the other part of the hydraulic oil passes through the second switch valve 20b and the spray head 240 in sequence and then returns to the oil storage tank 210. The spray branch is used to enhance the gas-liquid separation effect. When the hydraulic oil returns to the oil storage tank 210 through the first switch valve 20a, the hydraulic oil will also have a spray effect to assist the gas-liquid separation because the upper part of the oil storage tank 210 is vacuum; the separated air enters the buffer tank 250 from the oil storage tank 210 and is discharged under the action of the vacuum pump 260. The hydraulic oil circulates along the above path driven by the circulation pump 220, gradually filling the hydraulic oil into the internal annulus of the push-type vertical drilling tool 10 and discharging the air in the push-type vertical drilling tool 10, thereby ensuring the smooth progress of subsequent experiments. At this time, the vacuum pressure gauge 270 can detect that there is no gas in the pipeline. During the circulation of hydraulic oil, the vacuum branch creates a vacuum on the upper part of the oil storage tank 210. Due to the pressure difference, part of the sprayed hydraulic oil can enter the buffer tank 250 from the oil storage tank 210 and be stored at the bottom of the buffer tank 250. After the hydraulic oil accumulates to a certain amount, the spray pump starts to work and sprays this part of the hydraulic oil to separate the gas and liquid, so that there is no gas in the circulating oil filling system, and it is conducive to recovering this part of the hydraulic oil for subsequent use. During the oil filling and exhaust process, the second switch valve 20b can be adjusted as needed to distribute the amount of oil entering the oil inlet branch and the spray branch to ensure that the speed of the oil filling and exhaust process is maximized.

[0040] After the internal space of the push-type vertical drilling tool 10 is filled with oil and there is no gas in the pipeline, the first switch valve 20a, the second switch valve 20b and the fourth switch valve 20d are closed, so that the circulation pump 220 fills the required amount of oil into the push-type vertical drilling tool 10. After reaching the required pressure, the third switch valve 20c is closed and the circulation pump 220 stops working. During the experiment, if the pressure needs to be increased, the third switch valve 20c is opened and the circulation pump 220 is started to continue to fill the hydraulic oil. If the pressure needs to be reduced, the fourth switch valve 20d is opened or the third switch valve 20c and the second switch valve 20b are opened to return the hydraulic oil to the oil storage tank 210.

[0041] After the experiment is completed, the first switch valve 20 a and the fourth switch valve 20 d are opened to return the hydraulic oil to the oil storage tank 210 .

[0042] In this embodiment, the thrust monitoring system includes a thrust sensor 310 and an elastic telescopic rod 320, and a plurality of thrust sensors 310 are arranged around the axis of the push-type vertical drilling tool 10; one end of the elastic telescopic rod 320 is connected to the wellbore simulation system, and the other end is connected to the thrust sensor 310, and is configured to be retractable along the radial direction of the push-type vertical drilling tool 10. Specifically, the elastic telescopic rod 320 includes a mounting seat 321, a spring 322 and a sliding rod 323; the mounting seat 321 is installed on the outer tube 130, one end of the sliding rod 323 is inserted into the mounting seat 321 and is slidably connected to the mounting seat 321, and the other end is connected to the thrust sensor 310; the spring 322 is sleeved on the sliding rod 323, one end is connected to the mounting seat 321, and the other end is connected to the sliding rod 323, and is configured to apply thrust to the sliding rod 323 to make the thrust sensor 310 contact with the push-type vertical drilling tool 10, such as Figure 2 The thrust sensor 310 can obtain the radial force of the push-type vertical drilling tool 10, and the cooperation between the elastic telescopic rod 320 and the thrust sensor 310 allows the push-type vertical drilling tool 10 to undergo radial displacement, that is, allows the piston 11 to undergo radial movement, so as to obtain the most accurate experimental parameters.

[0043] In this embodiment, the parameter monitoring and control system includes a thrust monitoring and control terminal 410 and a temperature and pressure monitoring and control terminal 420; the thrust monitoring and control terminal 410 is connected to the thrust sensor 310 to monitor the thrust change of the push-type vertical drilling tool 10 under different temperature environments, and transmit the monitoring data to the circulating oil filling system, and automatically adjust the amount of oil filled into the push-type vertical drilling tool 10 by the circulating oil filling system according to the change of thrust, so as to adjust the thrust; the temperature and pressure monitoring and control terminal 420 is connected to the temperature and pressure sensor 160 to monitor the temperature and pressure of the wellbore simulation system and adjust the temperature of the hydraulic oil as needed to stabilize the state of the liquid in the simulated wellbore, so as to realize the test under the set temperature condition and monitor the pressure change of the hydraulic oil in the annular oil storage space a. When the temperature changes, the pressure of the hydraulic oil in the annular oil storage space a will change accordingly, and the hydraulic oil in the internal system of the push-type vertical drilling tool 10 expands under high temperature conditions, causing the thrust of the piston 11 to change. At this time, the thrust monitoring and control terminal 410 adjusts the amount of oil filled in the circulating oil filling system to maintain constant thrust, so as to adapt to the pressure change of the hydraulic oil in the annular oil storage space a under high temperature conditions.

[0044] In this embodiment, the circulating oil filling system interacts with the parameter monitoring and control system to adjust the oil filling amount and pressure when the temperature changes to maintain a constant thrust of the push-type vertical drilling tool 10, thereby avoiding the situation where the drilling pressure is reduced to maintain stable tool performance.

[0045] The working process of the wellbore simulation device for vertical drilling tool thrust test provided in this embodiment is as follows:

[0046] The wellbore simulation system starts to heat up, and the parameter monitoring system monitors the temperature and pressure changes in the annular oil storage space a. When the temperature rises to the initial threshold, the circulating oil filling system starts. During the circulating oil filling process, the vacuum pump 260 continuously extracts the air in the hydraulic oil to keep the hydraulic oil in a certain vacuum state. The parameter monitoring system monitors the thrust change of the push-to-type vertical drilling tool 10. When the temperature continues to rise to the set threshold and the entire device is in a temperature-stable state, the parameter monitoring system obtains the temperature and pressure data of the hydraulic oil in the annular oil storage space a and the thrust data of the piston 11, and transmits the data to the circulating oil filling system, so that the circulating oil filling system automatically adjusts the amount of oil filled into the push-to-type vertical drilling tool 10 so that the thrust of the push-to-type vertical drilling tool 10 reaches the set value. In this process, the thrust of the push-to-type vertical drilling tool 10 and the pressure value of the hydraulic oil in the annular oil storage space a are increased synchronously until the oil filling temperature is stable, and finally the thrust of the piston 11 on the push-to-type vertical drilling tool 10 and the hydraulic oil pressure in the annular oil storage space a are balanced. In this embodiment, the circulating oil filling system includes a control module, which is used to obtain data such as temperature, pressure, thrust, etc., and adjust the oil filling amount according to the data. Specifically, the control module can be set to a PLC.

[0047] The wellbore simulation device for vertical drilling tool thrust test provided in this embodiment can realize the performance test of the vertical drilling tool thrust in a high temperature environment. The annular oil storage space a can simulate the high temperature environment. At the same time, the circulating oil filling system circulates the hydraulic oil to fill the internal space of the push-type vertical drilling tool 10, thereby realizing the adjustment of the hydraulic oil filling amount and thrust of the push-type vertical drilling tool 10 according to different temperature conditions, so as to ensure the efficient and stable operation of the push-type vertical drilling tool 10 in different temperatures, especially in high temperature environments, and achieve the purpose of preventing deflection and fast drilling while ensuring the drilling pressure, avoiding reducing the drilling pressure to ensure the stability of the tool, and providing reliable data support for maximizing the drilling speed.

[0048] The wellbore simulation device for thrust testing of vertical drilling tools provided in this embodiment can circulate and fill the push-type vertical drilling tool 10 with hydraulic oil under high temperature conditions, and exhaust and vacuum the hydraulic oil, so that the hydraulic oil inside the push-type vertical drilling tool 10 does not contain air, avoiding the influence of the hydraulic oil expansion change caused by filling oil at normal temperature but operating in a high temperature environment, thereby avoiding unpredictable influence on the thrust of the vertical drilling tool, improving the stability of the vertical drilling tool 10 working underground, and achieving the effect of preventing deflection and fast drilling; verifying the thrust of the push-type vertical drilling tool 10 under different temperature conditions underground; and realizing precise adjustment of the oil filling amount of the push-type vertical drilling tool 10 by setting the thrust.

[0049] The wellbore simulation device for thrust testing of vertical drilling tools provided in this embodiment can realize accurate hydraulic oil filling of the push-type vertical drilling tool 10 according to the pressure in the wellbore at the operating temperature through precise simulation measurement, and remove the mixed air, so as to achieve the balance between the thrust of the piston 11 on the push-type vertical drilling tool 10 and the pressure in the wellbore, thereby ensuring the working stability of the push-type vertical drilling tool 10, eliminating the need for repeated adjustments or reducing the drilling pressure, and greatly improving the drilling efficiency.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A wellbore simulation device for vertical drilling tool thrust testing, characterized in that: Including wellbore simulation system, circulating oil filling system and thrust monitoring system; The wellbore simulation system comprises a heating cylinder (110), a push-type vertical drilling tool (10) is inserted into the heating cylinder (110) and forms an annular oil storage space (a) with both ends closed together with the heating cylinder (110), and the heating cylinder (110) is used to heat the liquid in the annular oil storage space (a); The circulating oil filling system is in communication with the push-type vertical drilling tool (10), and the outlet and the inlet of the circulating oil filling system are respectively in communication with the internal space of the push-type vertical drilling tool (10) to form a circulation loop; The thrust monitoring system comprises a thrust sensor (310) and an elastic telescopic rod (320), wherein a plurality of the thrust sensors (310) are arranged around the axis of the push-type vertical drilling tool (10); one end of the elastic telescopic rod (320) is connected to the wellbore simulation system, and the other end is connected to the thrust sensor (310), and is configured to be telescopic along the radial direction of the push-type vertical drilling tool (10).

2. The wellbore simulation device for vertical drilling tool thrust testing according to claim 1, characterized in that: The wellbore simulation system further comprises a heat-insulating cylinder (120), an outer cylinder (130), an upper sealing cover (140) and a lower sealing cover (150); The heat preservation tube (120) is sleeved on the heating tube (110), and the outer tube (130) is sleeved on the heat preservation tube (120); The upper sealing cover (140) and the lower sealing cover (150) are respectively connected to two ends of the outer cylinder (130); The upper sealing cover (140) and the lower sealing cover (150) are respectively connected to the two ends of the heating cylinder (110) to seal the two ends of the annular oil storage space (a).

3. The wellbore simulation device for vertical drilling tool thrust testing according to claim 2, characterized in that: The wellbore simulation system further comprises a temperature and pressure sensor (160). The two temperature and pressure sensors (160) are respectively installed on the upper sealing cover (140) and the lower sealing cover (150) for detecting the liquid temperature and pressure in the annular oil storage space (a).

4. The wellbore simulation device for vertical drilling tool thrust testing according to claim 3, characterized in that: The heating cylinder (110) is configured to heat in sections along the axial direction.

5. The wellbore simulation device for vertical drilling tool thrust testing according to claim 1, characterized in that: The elastic telescopic rod (320) comprises a mounting seat (321), a spring (322) and a sliding rod (323); The mounting seat (321) is installed on the wellbore simulation system, one end of the sliding rod (323) is inserted into the mounting seat (321) and is slidably connected to the mounting seat (321), and the other end is connected to the thrust sensor (310); the spring (322) is sleeved on the sliding rod (323), one end is connected to the mounting seat (321), and the other end is connected to the sliding rod (323), and is configured to apply thrust to the sliding rod (323) so that the thrust sensor (310) contacts the push-type vertical drilling tool (10).

6. The wellbore simulation device for vertical drilling tool thrust testing according to claim 1, characterized in that: The circulating oil filling system comprises an oil storage tank (210), a circulating pump (220), a buffer tank (250) and a vacuum pump (260); The oil storage tank (210) is used to store hydraulic oil. The oil storage tank (210), the circulating pump (220) and the push-type vertical drilling tool (10) are connected in series. The circulating pump (220) is used to send the hydraulic oil in the oil storage tank (210) into the internal space of the push-type vertical drilling tool (10) and return it to the oil storage tank (210); The buffer tank (250) is in communication with the oil storage tank (210), and the vacuum pump (260) is in communication with the buffer tank (250); The vacuum pump (260) evacuates the buffer tank (250) so that air in the hydraulic oil is discharged through the buffer tank (250) and the vacuum pump (260).

7. The wellbore simulation device for vertical drilling tool thrust testing according to claim 6, characterized in that: The circulating oil filling system also includes a first switch valve (20a), which is arranged between the outlet of the internal space of the push-type vertical drilling tool (10) and the oil storage tank (210).

8. The wellbore simulation device for vertical drilling tool thrust testing according to claim 7, characterized in that: The circulating oil filling system further comprises a spray branch, the two ends of which are respectively connected to the oil storage tank (210) and the circulating pump (220), and the outlet of the spray branch is arranged in the oil storage tank (210); A spray head (240) is provided at the outlet of the spray branch for spraying hydraulic oil onto the inner wall of the oil storage tank (210); The circulating pump (220) extracts the hydraulic oil in the oil storage tank (210) and sprays the hydraulic oil onto the inner wall of the oil storage tank (210) through the spray branch.

9. The wellbore simulation device for vertical drilling tool thrust testing according to claim 8, characterized in that: The circulating oil filling system also includes a filter (230). The two filters (230) are respectively arranged between the circulating pump (220) and the internal space of the push-type vertical drilling tool (10) and between the oil storage tank (210) and the internal space of the push-type vertical drilling tool (10), and are used to filter bubbles in the hydraulic oil.

10. The wellbore simulation device for vertical drilling tool thrust testing according to claim 3, characterized in that: Also included is a parameter monitoring and control system, the parameter monitoring and control system comprising a thrust monitoring and control terminal (410) and a temperature and pressure monitoring and control terminal (420); The temperature and pressure monitoring control terminal (420) is connected to the temperature and pressure sensor (160) to obtain the temperature and pressure parameters of the liquid in the oil storage space (a) and to control the temperature of the liquid, and at the same time transmit the pressure parameters to the circulating oil filling system; The thrust monitoring and control terminal (410) is connected to the thrust sensor (310) and transmits the monitored thrust data to the circulating oil filling system. The circulating oil filling system automatically adjusts the amount of oil filled into the internal space of the push-type vertical drilling tool (10) according to the change in thrust and the pressure of the liquid in the oil storage space (a).

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