In-hole in-situ testing system and method
By using hydraulic cylinders, flowmeters and spring cables in static contact detection devices, the speed limit and signal stability problems are solved, data reliability is improved, maintenance costs are reduced, and subsea soil is achieved more efficient test.
Patent Information
- Application Number
- CN202010403717.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2020-05-13
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2040-05-13
AI Technical Summary
Traditional static touch detection devices lack effective speed limiting devices and ranging devices, resulting in low reliability of test data and prone to signal loss in deep-sea environments, and the control device is too complex to increase maintenance costs.
Adopt an in-hole in-situ test system including a pipe cable winch, composite pipe cable, in-situ tester and controller. The speed limit and depth measurement of the test probe are achieved through hydraulic cylinder devices and flowmeters, and through spring cables and pressure limits Valve protects communication signals, simplifying positioning devices to reduce maintenance costs.
It improves the accuracy of penetration speed control and depth measurement of the test probe, avoids signal loss, reduces maintenance costs, and enhances the reliability and stability of the system.
Smart Images
Figure CN111485543B_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of marine engineering survey, and in particular to an in-hole in-situ testing system and method. Background Art
[0002] Before the construction of relevant marine engineering facilities, it is necessary to carry out preliminary investigations on the basic physical and mechanical properties of the seabed soil and the bearing capacity of the foundation, and static penetration is an effective means to obtain these seabed soil properties. With the continuous development of marine resource development and utilization and marine engineering construction, static penetration of seabed soil has been increasingly widely used in the fields of marine geological surveys and marine engineering surveys.
[0003] Static penetration testing is to obtain relevant test parameters of the soil by penetrating the probe into the seabed soil at a quasi-static and uniform speed through a penetration device. At present, the seabed static penetration test process mainly adopts the seabed static penetration test, which has a relatively simple equipment system structure and is relatively convenient to use and operate. The seabed penetration test is located on the seabed surface through the penetration device, and then a probe rod with a probe at the front end is used to penetrate the seabed soil from the seabed surface through the penetration device.
[0004] Chinese patent number CN110029646A discloses an underground static penetration system, including a probe, a probe rod, a drill bit, a drill rod, a penetration mechanism, an oil line separator, a bearing head, an umbilical cable, an axial positioner and a speed measuring mechanism. A drill bit is provided at the bottom end of the drill rod, and a probe rod is provided inside. The bottom end of the probe rod is connected to the probe, and the top end is connected to the penetration mechanism. The top end of the penetration mechanism is connected to the oil line separator. The top end of the oil line separator is fixedly connected to the umbilical cable through the bearing head. An axial positioner is provided on the penetration mechanism, and a positioning groove matching the axial positioner is provided on the inner wall of the drill rod. The static penetration system is adopted, with the drilling platform as the penetration reference, and the deep static penetration probe is lowered along the middle hole of the drill pipe. The penetration system is started, and after obtaining data within a stroke, the drill bit is used to sweep away the tested soil layer, and the mud pump is started at the same time to clean the mud and sand in the drill pipe. However, this patent still has shortcomings: first, the lack of effective speed limiting device and distance measuring device leads to low reliability of test data; second, the lack of reliable communication means leads to the loss of connection of the in-situ tester in the deep sea environment; third, the control device of the positioning device is too complicated, which increases the subsequent maintenance cost. Summary of the invention
[0005] In order to overcome the deficiencies of the prior art, one of the objects of the present invention is to provide an in-hole in-situ testing system, which can solve the problems that traditional static probing devices cannot effectively limit speed, the control means are too complicated, and signal loss is easy to occur during the static probing process.
[0006] The second object of the present invention is to provide an in-situ testing method in a hole, which can solve the problems that the traditional static penetration device cannot effectively limit the speed, the control means are too complicated, and the signal is easily lost during the static penetration process.
[0007] In order to achieve one of the above purposes, the technical solution adopted by the present invention is as follows:
[0008] An in-hole in-situ testing system comprises a pipe winch, a composite pipe cable, an in-situ tester and a controller, wherein the in-situ tester comprises a tail sleeve, a shell, a test probe arranged at the lower end of the shell, a positioning device, and a hydraulic cylinder device and a flow meter arranged inside the shell from bottom to top, wherein one end of the composite pipe cable is wound on the pipe winch, the other end of the composite pipe cable is connected to the upper end of the positioning device through the tail sleeve, the lower end of the positioning device is connected to the shell, the upper end of the test probe is connected to the lower end of the hydraulic cylinder device, the oil outlet of the composite pipe cable is connected to the oil inlet of the flow meter, the oil outlet of the flow meter is connected to the oil inlet of the hydraulic cylinder device, the pipe winch, the composite pipe cable, the flow meter and the test probe are connected to the controller; the hydraulic cylinder device is used to drive the test probe to move downward; the flow meter is used to measure the amount of oil entering the hydraulic cylinder device to obtain the penetration depth of the in-situ tester; the positioning device is used to engage with the inside of the drill pipe to limit the position of the in-situ tester.
[0009] Preferably, the hydraulic cylinder device includes a hydraulic pump and a hydraulic cylinder connected to a controller, the hydraulic cylinder includes a hydraulic rod arranged in a rod cavity, a first cable arranged in an inner cavity of the hydraulic rod, and a second cable arranged in a rodless cavity, the oil outlet of the flow meter is connected to the oil inlet of the hydraulic pump, the oil outlet of the hydraulic pump is connected to the rodless cavity of the hydraulic cylinder, the signal output end of the test probe is connected to the composite pipe cable through the first cable and the second cable in sequence, and the upper end of the test probe is connected to the hydraulic cylinder through the hydraulic rod.
[0010] Preferably, the second cable is a spring cable.
[0011] Preferably, it also includes a one-way valve, which is arranged at one end of the rod cavity close to the test probe; the one-way valve is used to discharge the liquid stored in the rod cavity to control the penetration speed of the test probe.
[0012] Preferably, the composite pipe cable includes an oil pipeline and a third cable, the oil outlet of the oil pipeline is connected to the oil inlet of the flow meter, and the signal output end of the test probe is connected to the controller through the first cable, the second cable and the third cable in sequence.
[0013] Preferably, the third cable covers the outer surface of the oil pipeline.
[0014] Preferably, a pressure-limiting valve is further included, and the flow meter is connected to the composite pipe cable via the pressure-limiting valve.
[0015] Preferably, the positioning device includes a claw seat arranged at the upper end of the shell, a connecting plate, a first elastic unit, at least one claw for engaging with the inside of a drill pipe and a connecting rod movably connected to the claw seat, the claw seat is provided with at least one claw groove arranged along the axial direction, the claw is arranged in the claw groove, the lower end of the claw is movably connected to the claw groove, the upper end of the claw is connected to the lower end of the connecting rod away from the drill pipe through the connecting plate, the upper end of the connecting rod passes through the first elastic element, the upper end of the claw seat and the lower end of the tail sleeve in sequence, and the upper end of the claw extends outward near the drill pipe side to form claw teeth; the composite pipe cable is used to drive the connecting rod to move axially upward or axially downward; the connecting rod is used to drive the claw teeth of the claw to move back and forth between a first position and a second position; the first position is the position where the claw teeth are separated from the inside of the drill pipe; the second position is the position where the claw teeth are engaged with the inside of the drill pipe.
[0016] Preferably, it further comprises a second elastic element, wherein the second elastic element is arranged between the lower end of the claw and the claw groove.
[0017] In order to achieve the second purpose above, the technical solution adopted by the present invention is as follows:
[0018] An in-hole in-situ testing method, which is applied to an in-hole in-situ testing system, comprises the following steps:
[0019] S1: injecting water into the rod chamber of the hydraulic cylinder so that the volume of the rod chamber increases to a preset level;
[0020] S2: Connect the composite pipe cable to the in-situ tester through the tail sleeve;
[0021] S3: driving the umbilical winch to rotate forward, lowering the in-situ tester into the drill pipe, so that the in-situ tester is lowered along the drill pipe to the seabed;
[0022] S4: the cable winch stops rotating, and the first elastic element in the positioning device drives the connecting rod to move downward, so that the connecting rod drives the claw teeth to move to the second position through the connecting plate and engage with the inside of the drill pipe;
[0023] S5: The composite pipe and cable supplies oil to the rodless cavity of the hydraulic cylinder device through the pressure limiting valve and the flow meter in turn. The flow meter records the amount of oil inflow into the rodless cavity of the hydraulic cylinder device to obtain the penetration depth of the test probe;
[0024] S6: The one-way valve discharges the water in the rod chamber to limit the extent of volume reduction of the rod chamber;
[0025] S7: driving the pipe winch to rotate in the opposite direction, and the composite pipe pulls the connecting rod in the positioning device upward, so that the connecting rod drives the claw teeth to move to the first position through the connecting plate, and separate from the inside of the drill pipe.
[0026] Compared with the prior art, the beneficial effects of the present invention are as follows: by arranging a flow meter at the oil inlet end of the hydraulic cylinder, the flow meter is used to obtain the oil inlet amount of the hydraulic cylinder, and then the penetration depth of the test probe is obtained, and then a one-way valve is arranged in the rod chamber of the hydraulic cylinder to discharge the liquid pre-injected into the rod chamber, so that when the rodless chamber applies pressure to the rod chamber, the liquid in the rod chamber provides an upward reaction force to the rodless chamber, thereby limiting the penetration speed of the test probe to a certain extent, and at the same time, a spring cable is arranged in the rodless chamber, and the elastic deformation characteristics of the spring cable are used to ensure the communication of the test probe during static penetration, avoiding the problem of communication failure caused by too short cables and tangled cables, and a pressure limiting valve is also provided at the oil inlet of the flow meter, which limits the oil pressure to protect the flow meter from damage and limit the penetration speed of the test probe; in addition, the connecting rod is driven to move upward or downward by the tension of the composite pipe cable and the elastic force of the first elastic element, thereby controlling the movement of the claw teeth of the positioning device between the first position and the second position, so as to realize the rapid positioning of the in-situ tester. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] Figure 1 It is a schematic structural diagram of the in-hole in-situ testing system described in the present invention.
[0028] Figure 2 for Figure 1 Schematic diagram of the enlarged G area.
[0029] Figure 3 for Figure 1 FF direction cross-sectional view.
[0030] Figure 4 for Figure 3 A magnified schematic diagram of area A.
[0031] Figure 5 for Figure 3 Schematic diagram of the enlarged area B in FIG.
[0032] Figure 6 for Figure 3 Schematic diagram of the enlarged C area.
[0033] Figure 7 for Figure 3 Schematic diagram of the enlarged D area.
[0034] Figure 8 for Figure 3 Schematic diagram of the enlarged area E in FIG.
[0035] Fig. 9 It is a schematic diagram of the structure of the composite pipe and cable described in the present invention.
[0036] Fig.10 It is a structural schematic diagram of the cable winch described in the present invention.
[0037] In the figure: 1-composite pipe and cable; 11-oil pipeline; 12-third cable; 2-tail sleeve; 3-test probe; 4-hydraulic cylinder device; 41-hydraulic pump; 42-hydraulic cylinder; 421-rod chamber; 4211-hydraulic rod; 422-rodless chamber; 4221-second cable; 5-flow meter; 6-check valve; 7-pressure limiting valve; 8-positioning device; 81-claw seat; 811-claw groove; 82-connecting plate; 83-claw; 831-claw tooth; 84-connecting rod; 85-first elastic element; 86-second elastic element; 9-pipe and cable winch; 91-capstan; 92-guide. DETAILED DESCRIPTION
[0038] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.
[0039] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.
[0040] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0041] Below, the present invention is further described in conjunction with the accompanying drawings and specific embodiments:
[0042] In the present invention, the in-hole in-situ testing system is applied to geological exploration, especially in marine geophysical exploration engineering, and the application of the in-hole in-situ testing system is more extensive. In fact, it is necessary to sail the drilling ship to a predetermined sea level in advance, use anchoring positioning or dynamic positioning to stop the drilling ship at the guided position, and then lower the seabed base until the seabed base sinks to the seabed, and then lower the in-situ tester into the drill pipe between the drilling ship and the seabed base through the pipe and cable winch 9 arranged on the ship. The in-situ tester will eventually pass through the seabed base and begin to penetrate the seabed for static penetration; preferably, the inside of the drill pipe is provided with a step-like structure; at the same time, the hydraulic cylinder 42 manufactured in accordance with standardization regulations generally has two chambers: a rod chamber 421 and a rodless chamber 422. The hydraulic cylinder 42 described in this embodiment follows this structure. In this embodiment, before the in-situ tester is lowered, an appropriate amount of liquid substance (such as water) is first injected into the rod chamber 421 of the hydraulic cylinder 42, so that the volume of the rod chamber 421 is within a reasonable range and increases to a certain extent; preferably, the composite pipe cable 1 includes an oil pipeline 11 and a third cable 12 (such as Fig. 9 As shown), the third cable 12 covers the outer surface of the oil pipeline 11, and the third cable 12 is a cable for signal transmission and / or power supply; preferably, in this embodiment, the drill rod is arranged between the drilling ship and the seabed base, or arranged in the seabed drill hole, and the inside of the drill rod is provided with a step-like structure, and the claw teeth 831 can be mutually engaged with the inside of the drill rod; preferably, the cable winch 9 includes a winch 91 and a guide 92, as shown Fig.10 As shown, the winch 91 is used to wind the composite umbilical cable 1, and the guide 92 is used to control the direction of lowering the composite umbilical cable 1. In this embodiment, the test probe is not limited to a static penetration probe, but can also be a variety of in-situ testing devices or sampling equipment, such as a cross-plate shear instrument and a cannula sampler.
[0043] Embodiment 1:
[0044] like Figure 1-10As shown, in this embodiment, the in-situ test system in the hole includes a pipe cable winch 9, a composite pipe cable 1, an in-situ tester and a controller. The in-situ tester includes a tail sleeve 2, a shell, a test probe 3 arranged at the lower end of the shell, a positioning device 8, and a hydraulic cylinder device 4 and a flow meter 5 arranged inside the shell from bottom to top. One end of the composite pipe cable 1 is wound on the pipe cable winch 9, and the other end of the composite pipe cable 1 is connected to the upper end of the positioning device 8 through the tail sleeve 2. Preferably, the lower end of the positioning device 8 is connected to the shell, the upper end of the test probe 3 is connected to the lower end of the hydraulic cylinder device 4, the oil outlet of the composite pipe cable 1 is connected to the oil inlet of the flow meter 5, and the oil outlet of the flow meter 5 is connected to the oil inlet of the hydraulic cylinder device 4. The pipe cable winch 9, the composite pipe cable 1, the flow meter 5 and the test probe 3 are connected to the controller.
[0045] In this embodiment, the positioning device 8 includes a claw seat 81 arranged at the upper end of the shell, a connecting plate 82, at least one claw 83 for engaging with the drill pipe, and a connecting rod 84 movably connected to the claw seat 81, the claw seat 81 is provided with at least one claw groove 811 arranged along the axial direction, the claw 83 is arranged in the claw groove 811, the lower end of the claw 83 is movably connected to the claw groove 811, the upper end of the claw 83 is connected to the lower end of the connecting rod 84 through the connecting plate 82 away from the drill pipe, and the upper end of the connecting rod 84 is passed through the connecting plate 82 in sequence. The upper end of the claw seat 81 is connected to the lower end of the tail sleeve 2 through the first elastic element 85, and the upper end of the claw 83 extends outward near the drill pipe to form a claw tooth 831; the composite pipe cable 1 is used to drive the connecting rod 84 to move axially upward or axially downward; the connecting rod 84 is used to drive the claw tooth 831 of the claw 83 to move back and forth between the first position and the second position; the first position is the position where the claw tooth 831 is separated from the inside of the drill pipe; the second position is the position where the claw tooth 831 is engaged with the inside of the drill pipe. Preferably, the first elastic element 85 is a spring; a second elastic element 86 is provided between the lower end of the claw 83 and the claw groove 811, and the second elastic element 86 is a spring sheet. When the in-situ tester reaches the seabed, the cable winch 9 stops rotating, and the pulling force of the composite cable 1 on the connecting rod 84 is less than the force of the spring, then the spring in the positioning device 8 starts to reset and drives the connecting rod 84 downward, so that the connecting rod 84 drives the claw tooth 831 to move to the second position through the connecting plate 82 and engages with the inside of the drill pipe. Preferably, after the cable winch 9 no longer provides an upward pulling force to the in-situ tester through the composite cable 1, the spring sheet between the lower end of the claw 83 and the claw groove 811 returns to a free state (the spring sheet in the free state is bent), further driving the claw tooth 831 to move to the second position. After the static penetration test is completed, the pipe winch 9 rotates in the opposite direction and pulls up the in-situ tester through the composite pipe cable 1. At this time, the pulling force of the composite pipe cable 1 on the connecting rod 84 is restored and is greater than the force of the spring. The spring in the positioning device 8 is compressed, and the composite pipe cable 1 drives the connecting rod 84 to move upward, resulting in a certain gap between the upper end of the positioning device 8 and the tail sleeve 2, so that the connecting rod 84 drives the claw tooth 831 to move to the first position through the connecting plate 82, and the claw tooth 831 is separated from the inside of the drill pipe, and the spring sheet is pulled from the bent state (free state) to the straight state.
[0046] In this embodiment, the hydraulic cylinder device 4 includes a hydraulic pump 41 and a hydraulic cylinder 42 connected to a controller, the hydraulic cylinder 42 includes a hydraulic rod 4211 arranged in a rod cavity 421, a first cable arranged in the inner cavity of the hydraulic rod 4211 and a second cable 4221 arranged in a rodless cavity 422, the oil outlet of the flow meter 5 is connected to the oil inlet of the hydraulic pump 41, the oil outlet of the hydraulic pump 41 is connected to the rodless cavity 422 of the hydraulic cylinder 42, the signal output end of the test probe 3 is connected to the composite pipe cable 1 through the first cable and the second cable 4221 in sequence, and the upper end of the test probe 3 is connected to the hydraulic cylinder 42 through the hydraulic rod 4211.
[0047] Specifically, the oil outlet of the oil pipeline 11 is connected to the oil inlet of the flow meter 5, and the signal output end of the test probe 3 is connected to the controller through the first cable, the second cable 4221, and the third cable 12 in sequence. When the hydraulic cylinder device 4 drives the test probe 3 to press down for static penetration, the hydraulic rod 4211 gradually increases the depth of the test probe 3 penetrating into the soil layer, causing the distance between the upper end and the lower end of the rodless cavity 422 to gradually increase (that is, the volume of the rodless cavity 422 gradually increases, and the volume of the rod cavity 421 decreases), so the length of the cable in the rodless cavity 422 is also lengthened. In order to avoid the cable in the rodless cavity 422 from being broken or the cable being too long, causing the cable to be entangled and unable to communicate, the second cable 4221 is a spring cable, and the elastic deformation property of the spring cable is used to ensure the communication of the test probe 3 during static penetration, and to avoid the problem of communication failure caused by the cable being too short or the cable being tangled.
[0048] At the same time, the flow meter 5 records the amount of oil entering the rodless chamber 422 of the hydraulic cylinder 42 through the hydraulic pump 41, and sends the recorded data to the controller through the third cable 12. According to the formula: ,(in is the amount of oil flowing into the hydraulic cylinder 42, The penetration depth of the test probe 3 into the soil layer can be obtained by calculation (wherein H is the cross-sectional area of the rodless cavity 422 of the hydraulic cylinder 42 and H is the penetration depth).
[0049] Furthermore, a one-way valve 6 is provided at one end of the rod chamber 421 close to the test probe 3. During the static penetration test of the in-situ tester, the amount of oil entering the rodless chamber 422 of the hydraulic cylinder 42 will gradually increase, causing the volume of the rodless chamber 422 of the hydraulic cylinder 42 to gradually increase, thereby forcing the volume of the rod chamber 421 of the hydraulic cylinder 42 to gradually decrease, so that the water pre-injected into the rod chamber 421 is discharged from the one-way valve 6. Specifically, according to the principle of the communicating vessel, when the in-situ tester enters the ocean, if the rodless chamber 422 does not apply pressure to the rod chamber 421, the water in the rod chamber 421 will not flow out. At the same time, the one-way valve 6 needs to reach the working pressure before it can be opened to prevent the hydraulic oil circuit from having no oil supply. The hydraulic cylinder may produce uncontrolled displacement only due to the combined effect of oil gravity and leakage. At the same time, when the in-situ tester performs static probing, the rodless chamber 422 applies pressure to the rod chamber 421. Since the rod chamber 421 is pre-injected with water, the water in the rod chamber 421 will provide an upward reaction force to the rodless chamber 422 until the pressure in the rod chamber 421 reaches the working pressure, and the water in the rod chamber 421 will be discharged. At the same time, the pressure in the rod chamber 421 is also reduced. When the pressure in the rod chamber 421 reaches the working pressure again, the water in the rod chamber 421 will be discharged again, thereby limiting the penetration speed of the test probe 3 to a certain extent.
[0050] Preferably, a pressure-limiting valve 7 is further provided at the oil inlet of the flow meter 5 to protect the flow meter 5 from damage and to limit the penetration speed of the test probe 3 by limiting the oil pressure.
[0051] Embodiment 2:
[0052] like Figure 1-9 As shown, an in-hole in-situ testing method, which is applied to an in-hole in-situ testing system, comprises the following steps:
[0053] S1: injecting water into the rod chamber 421 of the hydraulic cylinder 42, so that the volume of the rod chamber 421 increases to a preset level;
[0054] Specifically, before lowering the in-situ tester, water (but not limited to water, it can also be other liquids suitable for deep-sea environment) is injected into the rod chamber 421 of the hydraulic cylinder 42 on the drilling ship in advance, so that the volume of the rod chamber 421 of the hydraulic cylinder 42 is increased to a preset level. Under ideal conditions, the volume of the rod chamber 421 after water injection reaches the maximum, and the volume of the rodless chamber 422 corresponding to the hydraulic cylinder 42 reaches the minimum.
[0055] S2: Connect the composite tube cable 1 to the in-situ tester through the tail sleeve 2;
[0056] Specifically, the composite tube cable 1 is fixedly connected to the in-situ tester through the tail sleeve 2 by means of a knob or clamping. In this embodiment, the upper end of the shell of the in-situ tester is connected to the lower end of the positioning device 8, so the composite tube cable 1 is connected to the upper end of the positioning device 8 through the tail sleeve 2.
[0057] S3: driving the umbilical winch 9 to rotate forward, lowering the in-situ tester into the drill pipe, so that the in-situ tester is lowered along the drill pipe to the seabed;
[0058] Specifically, in this embodiment, the umbilical winch 9 is set to rotate forward to lower the in-situ tester, and the umbilical winch 9 is set to rotate backward to pull up the in-situ tester; the in-situ tester is placed inside the drill pipe, so that the in-situ tester is lowered to the seabed along the inside of the drill pipe. During the lowering, the umbilical winch 9 provides an upward pulling force to the in-situ tester through the composite umbilical cable 1. At this time, the in-situ tester can be simply regarded as being affected only by gravity and tension.
[0059] S4: The umbilical winch 9 stops rotating, and the first elastic element 85 in the positioning device 8 drives the connecting rod 84 to move downward, so that the connecting rod 84 drives the claw teeth 831 to move to the second position through the connecting plate 82 and engage with the inside of the drill pipe;
[0060] Specifically, after the in-situ tester reaches the seabed, the umbilical winch 9 stops rotating, that is, the umbilical winch 9 no longer provides an upward pulling force to the in-situ tester through the composite umbilical cable 1, that is, the pulling force of the composite umbilical cable 1 on the connecting rod 84 is zero or the pulling force of the composite umbilical cable 1 on the connecting rod 84 is less than the force of the spring, then the spring in the positioning device 8 begins to reset and drives the connecting rod 84 to move downward, so that the connecting rod 84 drives the claw tooth 831 to move to the second position through the connecting plate 82 and engages with the inside of the drill pipe. Preferably, after the umbilical winch 9 no longer provides an upward pulling force to the in-situ tester through the composite umbilical cable 1, the spring sheet between the lower end of the claw 83 and the claw groove 811 returns to a free state (the spring sheet in the free state is bent), further driving the claw tooth 831 to move to the second position. In this embodiment, the claw teeth 831 that interfere with the drill rod provide a reaction force (the direction of the reaction force is axially downward), which limits the position of the in-situ tester and prevents the in-situ tester from moving upward, so that the hydraulic cylinder device 4 can effectively press the test probe 3 into the soil layer.
[0061] S5: The composite pipe cable 1 supplies oil to the rodless chamber 422 of the hydraulic cylinder device 4 through the pressure limiting valve 7 and the flow meter 5 in sequence, and the flow meter 5 records the amount of oil inflow to the rodless chamber 422 of the hydraulic cylinder device 4 to obtain the penetration depth of the test probe 3;
[0062] Specifically, in this embodiment, after the claw teeth 831 of the positioning device 8 are engaged with the inside of the drill pipe, the oil delivery pipe 11 of the composite pipe cable 1 starts to supply oil to the hydraulic cylinder device 4, and the hydraulic oil passes through the pressure limiting valve 7 and the flow meter 5 in turn to enter the rodless chamber 422 of the hydraulic cylinder 42. The pressure limiting valve 7 is used to limit the oil pressure entering the flow meter 5 to prevent the flow meter 5 from being damaged by high oil pressure, and to limit the penetration speed of the test probe 3. At the same time, the flow meter 5 records the oil intake of the rodless chamber 422 of the hydraulic cylinder device 4, and sends the corresponding data to the controller via wireless or the third cable 12 of the composite pipe cable 1. The controller uses the formula: ,(in is the amount of oil flowing into the hydraulic cylinder 42, The penetration depth of the test probe 3 into the soil layer can be obtained by calculation (wherein H is the cross-sectional area of the rodless cavity 422 of the hydraulic cylinder 42 and H is the penetration depth).
[0063] S6: the one-way valve 6 discharges the water in the rod chamber 421 to limit the extent to which the volume of the rod chamber 421 is reduced;
[0064] Specifically, as the oil pipeline 11 of the composite cable 1 continues to supply oil, the volume of the rodless chamber 422 of the hydraulic cylinder 42 gradually increases, while the volume of the rod chamber 421 gradually decreases, and the water pre-injected into the rod chamber 421 is discharged from the one-way valve 6. Specifically, according to the principle of the communicating vessel, when the in-situ tester enters the ocean, if the rodless chamber 422 does not apply pressure to the rod chamber 421, the water in the rod chamber 421 will not flow out. At the same time, the one-way valve 6 needs to reach the working pressure before it can be opened to prevent the hydraulic oil circuit from having no oil supply. The hydraulic cylinder may produce uncontrolled displacement only due to the combined effect of oil gravity and leakage. At the same time, when the in-situ tester performs static probing, the rodless chamber 422 applies pressure to the rod chamber 421. Since the rod chamber 421 is pre-injected with water, the water in the rod chamber 421 will provide an upward reaction force to the rodless chamber 422 until the pressure in the rod chamber 421 reaches the working pressure, and the water in the rod chamber 421 will be discharged. At the same time, the pressure in the rod chamber 421 is also reduced. When the pressure in the rod chamber 421 reaches the working pressure again, the water in the rod chamber 421 will be discharged again, thereby limiting the penetration speed of the test probe 3 to a certain extent.
[0065] In this embodiment, when the volume of the rodless chamber 422 of the hydraulic oil cylinder 42 gradually increases, since the cross-sectional area of the rodless chamber 422 of the hydraulic oil cylinder 42 is constant, the distance between the upper and lower ends of the rodless chamber 422 of the hydraulic oil cylinder 42 gradually increases, so the spring cable in the rodless chamber 422 is gradually in a stretched state, thereby avoiding the problem of communication failure caused by the cable being too short and the cable being tangled. After the static penetration test is completed, the in-situ tester is pulled onto the ship, and water is injected into the rod chamber 421, so that the volume of the rod chamber 421 of the hydraulic oil cylinder 42 increases to a preset degree, and the spring cable gradually returns to its original state.
[0066] S7: driving the umbilical winch 9 to rotate in the opposite direction, and the composite umbilical 1 pulls the connecting rod 84 in the positioning device 8 upward, so that the connecting rod 84 drives the claw teeth 831 to move to the first position through the connecting plate 82, and separates from the inside of the drill pipe.
[0067] Specifically, after the static penetration test is completed, the pipe winch 9 rotates in the opposite direction, and the in-situ tester is pulled upward through the composite pipe cable 1. At this time, the pulling force of the composite pipe cable 1 on the connecting rod 84 is restored and is greater than the force of the spring, so the spring in the positioning device 8 is compressed, and the composite pipe cable 1 drives the connecting rod 84 to move upward, resulting in a certain gap between the upper end of the positioning device 8 and the tail sleeve 2, so that the connecting rod 84 drives the claw teeth 831 to move to the first position through the connecting plate 82, and the claw teeth 831 are separated from the inside of the drill pipe. The spring sheet is pulled from the bent state (free state) to the straight state, and the in-situ tester can be pulled onto the ship through the pipe winch 9.
[0068] For those skilled in the art, various other corresponding changes and deformations can be made according to the technical solutions and concepts described above, and all of these changes and deformations should fall within the protection scope of the claims of the present invention.
Claims
1. An in-hole in-situ testing system, characterized in that: It comprises an umbilical winch, a composite umbilical, an in-situ tester and a controller. The in-situ tester is used to penetrate the seabed along the drill pipe. The in-situ tester comprises a tail sleeve, a shell, a test probe arranged at the lower end of the shell, a positioning device, and a hydraulic cylinder device and a flow meter arranged inside the shell from bottom to top. The flow meter is located between the positioning device and the hydraulic cylinder device. One end of the composite umbilical is wound on the umbilical winch, and the other end of the composite umbilical is connected to the upper end of the positioning device through the tail sleeve. The lower end of the positioning device is connected to the shell. The upper end of the test probe is connected to the lower end of the hydraulic cylinder device, the oil outlet of the composite pipe cable is connected to the oil inlet of the flow meter, the oil outlet of the flow meter is connected to the oil inlet of the hydraulic cylinder device, and the pipe cable winch, composite pipe cable, flow meter and test probe are connected to the controller; the hydraulic cylinder device is used to drive the test probe to move downward; the flow meter is used to measure the amount of oil entering the hydraulic cylinder device to obtain the depth of the in-situ tester penetrating into the seabed; the positioning device is used to engage with the inside of the drill pipe to limit the position of the in-situ tester; The positioning device includes a claw seat arranged at the upper end of the shell, a connecting plate, a first elastic element, a second elastic element, at least one claw for engaging with the inside of the drill pipe and a connecting rod movably connected to the claw seat, the claw seat is provided with at least one claw groove arranged along the axial direction, the claw is arranged in the claw groove, the lower end of the claw is movably connected to the claw groove, the upper end of the claw is connected to the lower end of the connecting rod away from the drill pipe through the connecting plate, the upper end of the connecting rod passes through the first elastic element, the upper end of the claw seat is connected to the lower end of the tail sleeve in sequence, and the upper end of the claw A claw tooth is formed by extending outward from one side close to the drill rod; the composite tube cable is used to drive the connecting rod to move axially upward or axially downward; the connecting rod is used to drive the claw tooth of the claw to move back and forth between a first position and a second position; the first position is the position where the claw tooth is separated from the inside of the drill rod; the second position is the position where the claw tooth is engaged with the inside of the drill rod, the second elastic element is arranged between the lower end of the claw and the claw groove, the free state of the second elastic element is a bent state, the first elastic element is a spring, and the spring surrounds the connecting rod.
2. The in-hole in-situ testing system according to claim 1, characterized in that: The hydraulic cylinder device includes a hydraulic pump and a hydraulic cylinder connected to a controller. The hydraulic cylinder includes a hydraulic rod arranged in a rod cavity, a first cable arranged in an inner cavity of the hydraulic rod, and a second cable arranged in a rodless cavity. The oil outlet of the flow meter is connected to the oil inlet of the hydraulic pump, and the oil outlet of the hydraulic pump is connected to the rodless cavity of the hydraulic cylinder. The signal output end of the test probe is connected to the composite pipe cable through the first cable and the second cable in sequence, and the upper end of the test probe is connected to the hydraulic cylinder through the hydraulic rod.
3. The in-hole in-situ testing system according to claim 2, characterized in that: The second cable is a spring cable.
4. The in-hole in-situ testing system according to claim 2, characterized in that: It also includes a one-way valve, which is arranged at one end of the rod cavity close to the test probe; the one-way valve is used to discharge the liquid stored in the rod cavity to control the penetration speed of the test probe.
5. The in-hole in-situ testing system according to claim 2, characterized in that: The composite pipe cable includes an oil pipeline and a third cable, the oil outlet of the oil pipeline is connected to the oil inlet of the flow meter, and the signal output end of the test probe is connected to the controller through the first cable, the second cable, and the third cable in sequence.
6. The in-hole in-situ testing system according to claim 5, characterized in that: The third cable covers the outer surface of the oil pipeline.
7. The in-hole in-situ testing system according to claim 1, characterized in that: It also includes a pressure limiting valve, and the flow meter is connected to the composite pipe cable through the pressure limiting valve.
8. An in-hole in-situ testing method, applied to the in-hole in-situ testing system according to any one of claims 2 to 6, characterized in that: The following steps are involved: S1: injecting water into the rod chamber of the hydraulic cylinder so that the volume of the rod chamber increases to a preset level; S2: Connect the composite pipe cable to the in-situ tester through the tail sleeve; S3: driving the umbilical winch to rotate forward, lowering the in-situ tester into the drill pipe, so that the in-situ tester is lowered along the drill pipe to the seabed; S4: the cable winch stops rotating, and the first elastic element in the positioning device drives the connecting rod to move downward, so that the connecting rod drives the claw teeth to move to the second position through the connecting plate and engage with the inside of the drill pipe; S5: The composite pipe and cable supplies oil to the rodless cavity of the hydraulic cylinder device through the pressure limiting valve and the flow meter in turn. The flow meter records the amount of oil inflow into the rodless cavity of the hydraulic cylinder device to obtain the penetration depth of the test probe; S6: The one-way valve discharges the water in the rod chamber to limit the extent of volume reduction of the rod chamber; S7: driving the pipe winch to rotate in the opposite direction, and the composite pipe pulls the connecting rod in the positioning device upward, so that the connecting rod drives the claw teeth to move to the first position through the connecting plate, and separate from the inside of the drill pipe.