Portable work exploration drilling machine and hydraulic system control method thereof

Abstract

The portable work drilling machine and the hydraulic system control method thereof are provided, wherein the hydraulic valve of the portable work drilling machine is provided with a main oil path, a secondary oil path and a control oil path, a pump assembly is connected with the main oil path, the secondary oil path and the control oil path, the first secondary oil path is connected with the main oil path in an open-close switching mode through a first reversing valve, a pilot valve for controlling the first reversing valve is arranged in the control oil path, the first reversing valve is in a closed state when starting work, the oil pumped out by the pump assembly drives the power head driver to rotate at a low speed through the main oil path, and the mud driver is driven to pump mud into the well, and at the same time, the control oil path is used to inject the pilot valve cavity, when the first reversing valve is switched to a conduction state through the pilot valve control, the oil in the first secondary oil path flows into the main oil path, so as to drive the power head driver to rotate at a high speed.

Description

Technical Field

[0001] The present disclosure relates to the field of engineering drilling, and in particular to a portable engineering exploration drilling rig and a hydraulic system control method thereof. Background Art

[0002] Survey drilling rigs typically feature a single engine that drives the pump assembly. The pumped oil is distributed through hydraulic valves to functional components such as the power head driver, gripper, and mud driver for drilling. Mobile drilling rigs can be freely moved using a mobile mechanism, eliminating the need for construction workers to transport individual rig components to the survey site for reassembly. However, for construction sites in remote areas, complex road conditions during transportation require workers to remove the engine and transport it to the construction site. However, existing single-engine configurations are large and heavy, significantly increasing the handling burden on construction workers.

[0003] On the other hand, the hydraulic control system of the existing technology cannot accurately control the sequence of drill pipe rotation, drill pipe feeding, and mud injection during the start-up of the drilling rig. This can easily cause the drill pipe to start rotating at high speed before the well is fully filled with mud, resulting in excessive wear and even jamming of the drill pipe due to insufficient lubrication provided by the mud. In addition, after the well is fully filled with mud, the oil flow to the agitator and mud pump needs to be reduced to temporarily reduce or stop their operation. The hydraulic control system of the existing technology directly returns the oil that previously flowed to the agitator and mud pump to the oil tank, resulting in the waste of oil pressure of this oil. Summary of the Invention

[0004] The present disclosure provides a portable engineering exploration drilling rig and a hydraulic system control method thereof.

[0005] Specifically, the present disclosure is achieved through the following technical solutions:

[0006] In a first aspect, an embodiment of the present disclosure provides a portable drilling rig, comprising:

[0007] frame;

[0008] A moving mechanism, used for driving the drilling rig to move, wherein the moving mechanism is detachably connected to the frame;

[0009] The power mechanism is provided with three engines and three pump assemblies connected to the three engines in a one-to-one correspondence, wherein at least one pump assembly is configured as a double pump assembly;

[0010] The power head is provided with a power head driver, a drill rod, a clamp and a micro-feed driver. The power head driver is used to drive the drill rod to rotate, and the clamp is used to clamp the power head driver and the drill rod;

[0011] The mud mechanism is provided with a mud pool, a mud driver and an agitator. The mud driver is used to pump the mud in the mud pool into the well through the drill pipe;

[0012] A hydraulic valve is used to distribute the oil pumped out by the pump assembly at least between the power head driver and the mud driver, wherein the hydraulic valve is provided with a main oil circuit, a subsidiary oil circuit and a control oil circuit, the pump assembly is connected to the main oil circuit, the subsidiary oil circuit and the control oil circuit, the first subsidiary oil circuit is connected to the main oil circuit in an open-close switching manner through a first reversing valve, and a pilot valve for controlling the first reversing valve is provided in the control oil circuit, so that the first reversing valve is in a closed state when starting work, and the oil pumped out by the pump assembly drives the power head driver to rotate slowly through the main oil circuit, drives the mud driver to pump mud into the drilling well, and is injected into the valve chamber of the pilot valve through the control oil circuit. When the first reversing valve is controlled by the pilot valve to switch to the on state, the oil in the first subsidiary oil circuit flows into the main oil circuit, thereby driving the power head driver to rotate at high speed.

[0013] In some embodiments, the double pump assembly includes a first main pump and an auxiliary pump. The first main pump is connected to the main oil circuit so that the oil pumped out by the first main pump drives the power head driver to rotate slowly through the main oil circuit, driving the mud driver to pump mud into the well.

[0014] In some embodiments, the other two pump assemblies are respectively provided with a second main pump and a third main pump, which are respectively connected to the first auxiliary oil circuit and the control oil circuit, so that the first reversing valve is in a closed state when starting work, and the oil pumped out by the second main pump and the third main pump is injected into the valve chamber of the pilot valve through the control oil circuit. When the first reversing valve is controlled to switch to a conducting state by the pilot valve, the oil pumped out by the second main pump and the third main pump flows into the main oil circuit through the oil in the first auxiliary oil circuit, thereby driving the power head driver to rotate rapidly.

[0015] In some embodiments, the second main pump is further connected to the main oil circuit, so that the oil pumped out by the second main pump drives the power head driver to rotate slowly through the main oil circuit, thereby driving the mud driver to pump mud into the well.

[0016] In some embodiments, the hydraulic valve is provided with a second auxiliary oil circuit, which is connected to the main oil circuit in an open-close switching manner. A pilot valve for controlling the second reversing valve is provided in the second auxiliary oil circuit, so that the second reversing valve is in a closed state when starting work. The oil pumped out by the auxiliary pump drives the clamp to clamp the drill pipe through the second auxiliary oil circuit, and is injected into the pilot valve chamber of the second reversing valve through the second auxiliary oil circuit. When the second reversing valve is controlled to switch to the on state by the pilot valve, the oil in the second auxiliary oil circuit flows into the main oil circuit, thereby driving the power head driver to rotate at medium speed.

[0017] In some embodiments, the second sub-oil path is connected with the micro-feed driver through a pilot balanced piston, so as to limit the oil pressure from the auxiliary pump into the micro-feed driver.

[0018] In some embodiments, a one-way valve is arranged in each of the main oil path and the sub-oil path, so as to automatically supplement the oil flowing back from the mud driver into the head driver when the pump assembly is closed.

[0019] In the second aspect, the hydraulic system control method of the portable work exploration drilling machine is provided, and is used for the portable work exploration drilling machine in the first aspect, wherein the first reversing valve is in the closed state.

[0020] The oil pumped by the pump assembly drives the head driver to rotate slowly through the main oil path, and drives the mud driver to pump the mud into the wellbore, and at the same time, the oil is injected into the valve cavity of the pilot valve through the control oil path.

[0021] When the first reversing valve is switched to the conducting state by the pilot valve, the oil in the first sub-oil path flows into the main oil path, so as to drive the head driver to rotate quickly.

[0022] In one embodiment, the double-pump assembly of the portable work exploration drilling machine includes a first main pump and an auxiliary pump, the first main pump is connected with the main oil path, and the hydraulic system control method further includes: the oil pumped by the first main pump drives the head driver to rotate slowly through the main oil path, and drives the mud driver to pump the mud into the wellbore.

[0023] In one embodiment, the portable work exploration drilling machine further includes a second main pump and a third main pump, the second main pump and the third main pump are respectively connected with the first sub-oil path and the control oil path, and the hydraulic system control method further includes: when starting to work, the first reversing valve is in the closed state, the oil pumped by the second main pump and the third main pump is injected into the valve cavity of the pilot valve through the control oil path, and when the first reversing valve is switched to the conducting state by the pilot valve, the oil pumped by the second main pump and the third main pump flows into the main oil path through the oil in the first sub-oil path, so as to drive the head driver to rotate quickly.

[0024] According to the embodiment of the present disclosure, the power mechanism configuration mode of the single-engine is set to three engines, and since the three engines jointly provide sufficient oil flow and pressure to enable the rig to complete the work, the volume and weight of each engine can be smaller, and the difficulty of carrying and assembling by the construction personnel is reduced; each engine is provided with a pump assembly, and at least one pump assembly is set to a double pump assembly, the hydraulic valve is designed to form a main oil path, a first auxiliary oil path and a control oil path, the pump assembly is connected with the main oil path, the auxiliary oil path and the control oil path, the main oil path is used to drive the slow rotation of the drill pipe and drive the mud driver to pump the mud into the well, and the mud initially injected into the well can fully meet the lubrication requirement of the friction generated between the slow rotating drill pipe and the soil, and the oil in the control oil path promotes the conduction of the first reversing valve, and the oil in the first auxiliary oil path flows into the main oil path through the first reversing valve, since the time when the first reversing valve is conducted and the time when the well is filled with mud can be designed to be consistent, it is ensured that only when the well is filled with mud, the drill pipe is in high-speed rotation state to implement the drilling work, and the phenomenon of excessive wear or even jamming of the drill pipe is avoided.

[0025] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0026] The accompanying drawings, which are incorporated into and form part of the specification, illustrate embodiments consistent with the present application and, together with the specification, serve to explain the principles of the application.

[0027] Figure 1 is a schematic view of a portable rig in an embodiment of the present disclosure;

[0028] Figure 2 is a schematic view of a hydraulic control system in an embodiment of the present disclosure;

[0029] Figure 3 is a first perspective view of a hydraulic valve in an embodiment of the present disclosure;

[0030] Figure 4 is a first perspective view of a hydraulic valve in an embodiment of the present disclosure;

[0031] Figure 5 is a flow chart of a hydraulic system controlling the rotation of a drill pipe in an embodiment of the present disclosure.

[0032] REFERENCE NUMERALS:

[0033] 10: frame;

[0034] 20: moving mechanism;

[0035] 30: power mechanism; 31: engine; 311: first main pump; 312: auxiliary pump; 321: second main pump; 331: third main pump;

[0036] 40: power head; 41: power head driver; 42: drill rod; 43: clamp; 44: micro-feeding driver;

[0037] 50: mud mechanism; 51: mud tank; 52: mud driver; 53: agitator;

[0038] 60: hydraulic valve; 611: first reversing valve; 612: second reversing valve; 613: third reversing valve; 62: pressure relief valve; 63: pilot valve; 641: first time-delay port; 642: second time-delay port. DETAILED DESCRIPTION

[0039] The present disclosure will now be discussed with reference to several embodiments. It should be appreciated that these embodiments are discussed only to better illustrate the present disclosure and thus, are not meant to limit the scope of the disclosure.

[0040] As used herein, the terms "comprises," "comprising," "includes," "including," "has," "having," "contains," "containing," or variations thereof, are to be construed as open-ended terms that mean "including, but not limited to." The terms "sub-comprises," "sub-comprising," "sub-includes," "sub-including," "sub-has," "sub-having," "sub-contains," "sub-containing," or variations thereof, are to be construed as open-ended terms that mean "including, but not limited to." The terms "exemplary" and "one embodiment" are to be construed as "at least one embodiment." The term "another embodiment" is to be construed as "at least one other embodiment." The terms "first," "second," etc. can refer to different or identical objects. The term "set" is not limited to direct connections or indirect connections, and is not limited to specific connection manners. Other explicit and implicit definitions can also be included below.

[0041] Some specific values or value ranges can be involved in the following description. It should be understood that these values and value ranges are only exemplary, which can be beneficial to put the idea of the present disclosure into practice. However, the description of these examples is not intended to limit the scope of the present disclosure in any way. According to specific application scenarios and requirements, these values or value ranges can be set otherwise.

[0042] As described above, the single engine 31 of the prior art mobile drilling rig is large in size and heavy in weight, which is not conducive to the handling of construction personnel, and is prone to the phenomenon of excessive wear or even jamming of the drill rod 42 caused by the fact that the well is not filled with mud, and the problem of oil pressure waste caused by the return of oil liquid into the agitator 53 and the mud pump. The portable engineering drilling rig and the hydraulic system control method proposed by the embodiments of the present disclosure at least partially solve the above problems. The structure and working principle of the portable engineering drilling rig according to the example embodiments of the present disclosure will be described below with reference to Figures 1 to 5 As shown in FIG. 1, the portable engineering drilling rig according to the example embodiments of the present disclosure includes a power mechanism 30, a power head 40, a mud mechanism 50, and a hydraulic valve 60. The power mechanism 30 is connected to the power head 40, the mud mechanism 50, and the hydraulic valve 60. The power head 40 is connected to the mud mechanism 50 and the hydraulic valve 60. The mud mechanism 50 is connected to the hydraulic valve 60. Figure 1As shown, the portable drilling rig of the embodiment of the present disclosure generally includes a frame 10, a mobile mechanism 20, a power mechanism 30, a power head 40, a mud mechanism 50 and a hydraulic valve 60, wherein the frame 10 is used to carry the various functional components of the drilling rig, and the frame 10 is set on the mobile mechanism 20, and the drilling rig is driven to move as a whole by the mobile mechanism 20. For example, the mobile mechanism 20 can be a crawler, a drive wheel or other mechanism; the power mechanism 30 mainly includes an engine 31, which is generally a diesel engine 31 or an electric motor, and is used to drive the pump assembly to work so as to pump the oil required for the work to the drilling rig. The power head is provided with a driver, a drill rod 42 and a clamp 43. The drill rod 42 is clamped on the driver output structure by the clamp 43. The driver rotates to drive the drill rod 42 to drill. At the same time, the micro-feed driver 44 composed of a hydraulic cylinder drives the driver, the drill rod 42 and the clamp 43 to feed along the drilling depth direction. The mud mechanism 50 includes a mud pool 51, a mud driver 52 and an agitator 53. The agitator 53 is used to stir and maintain the fluidity of the mud in the mud pool 51. The mud driver 52 can be a hydraulic pump to pump the stirred mud into the well through the drill rod 42.

[0043] In order to reduce the labor intensity of construction workers in carrying and assembling the engine 31, the embodiment of the present disclosure designs the single engine 31 in the existing configuration into three engines 31. The three engines 31 can use models with lower power. The maximum pumping flow and pressure provided by the three engines 31 are sufficient to meet the working requirements of the exploration drilling rig, thereby making the size and weight of the three engines 31 smaller. Construction workers can carry and assemble them one by one, greatly reducing the labor intensity and difficulty of carrying and assembling, and making the exploration drilling rig portable.

[0044] The inventor proposed a configuration of three engines 31. This is not just a simple design of the number of engines 31, but also faces the problem of how to arrange the three engines 31 on the frame 10, as well as the design of the pump components and hydraulic valves 60 of the three engines 31. When arranging the three engines 31 on the frame 10, the overall balance performance of the drilling rig during movement and operation must be considered. In the embodiment of the present disclosure, the three engines 31 are arranged side by side ( Figure 1 As shown), a more balanced load-bearing distribution effect can be provided along the front and rear directions of the drilling rig. In another example, three engines 31 are stacked on each other (not shown in the figure), which can obtain more installation space for the frame 10.

[0045] The configuration of three engines 31 also provides for more flexible hydraulic control. In one embodiment, each of the three engines 31 is equipped with a pump assembly. One engine 31, serving as the main engine 31, is equipped with a dual pump assembly, meaning that the main pump and auxiliary pump 312 can operate independently. The other two engines 31 can each be equipped with a single pump assembly. Specifically, the dual pump assembly comprises a first main pump 311, which is composed of the first main pump 311 and the auxiliary pump 312. The single pumps connected to the other two engines 31 are respectively composed of a second main pump 321 and a third main pump 331.

[0046] The oil pumped out by the three pump assemblies needs to be flexibly distributed to the power head driver 41, the clamper 43, the micro-feed driver 44, the mud driver 52 and the agitator 53 through the hydraulic valve 60, so that they can perform their respective tasks in a predetermined order and power. Figure 3 and 4 As shown, the surface of the hydraulic valve 60 is provided with oil circuit interfaces connected to various components respectively (the reference numerals in the figure are the corresponding oil circuit connection components, and the interfaces without reference numerals are the one-way valve port, the oil tank return port, the pressure detection port and the process hole, etc.). A hydraulic control system oil circuit is formed inside the hydraulic valve 60, and the effect of the present disclosure is achieved by distributing oil.

[0047] The hydraulic control system of the embodiment of the present disclosure is described in detail below. Figure 2 As shown, the oil pumped out by the first main pump 311 first flows into the flow path L11, and then is divided into the flow paths L12 and L6. The oil flowing through the flow path L12 enters the power head driver 41, and the oil flowing through the flow path L6 is divided into L42 and L52, and finally introduced into the agitator 53 and the mud driver 52 respectively. That is, the oil pumped out by the first main pump 311 drives the drill pipe 42 to rotate, the mud to stir, and the mud to be injected into the drilling at the same time with the first flow rate I1.

[0048] The oil pumped out by the auxiliary pump 312 first flows into the flow path L21, and then is divided into the flow paths L24, L22 and L23. The third reversing valve 613 is in a closed state in the initial state. The oil flowing through the flow path L24 is cut off by the third reversing valve 613, and the oil flowing through the flow path L22 flows into the clamper 43, and the oil flowing through the flow path L23 flows into the micro-feed driver 44. At the same time, the oil flowing into the flow path L21 is also injected into the pilot valve chamber of the third reversing valve 613. After being controlled by the throttle valve for a period of time, the pilot valve chamber is filled with oil, so that the third reversing valve 613 is switched to the on state. The oil in the flow path L24 can also be diverted to the flow paths L12, L42 and L52 after passing through L25 and L6 in turn, so as to be connected with the power head driver 41, the agitator 53 and the mud driver 52. That is, the oil pumped out by the auxiliary pump 312 can drive the clamper 43 to clamp the drill pipe 42 and the power head to micro-feed in the initial state. After a preset period of time, the oil pumped out by the auxiliary pump 312 can also drive the drill pipe 42 to rotate, the mud to stir, and the mud to be injected into the well at the second flow rate I2.

[0049] In addition, a pressure relief valve 62 is provided in the flow path L21, and a pressure guide valve 63 is provided in the flow path L23, so as to limit the oil pressure flowing into the micro-feed driver, thereby preventing the drill rod from being excessively pressed against the soil surface, resulting in the inability to start the rotation action.

[0050] Second main pump 321 is connected to both ports of hydraulic valve 60. This means that the oil pumped by second main pump 321 flows simultaneously into flow paths L31 and L41. The oil flowing into flow path L31 is then diverted through L6 to flow paths L12, L42, and L53, ultimately flowing to the powerhead driver 41, the agitator 53, and the mud driver 52. In other words, the oil pumped from one port by second main pump 321 simultaneously drives the rotation of drill pipe 42, agitates the mud, and injects the mud into the wellbore for drilling, all at a third flow rate I3.

[0051] A first reversing valve 611 is provided in the flow path L41. In the initial state, the first reversing valve 611 is in a closed state, and the oil flowing into the flow path L41 is cut off by the first reversing valve 611. The oil flowing through the flow path L43 is injected into the pilot valve chamber of the first reversing valve 611 through the first delay valve port 641 connecting pipeline. After being controlled by the throttle valve for a period of time, the pilot valve chamber is filled with oil, so that the first reversing valve 611 is switched to a conducting state. The oil in the flow path L41 is diverted to the flow paths L12, L42 and L52 through L6, thereby connecting with the power head driver 41, the agitator 53 and the mud driver 52. That is, the oil in the other interface pumped out by the second main pump 321 does not drive any component to move in the initial state. After a preset period of time, the oil drives the drill pipe 42 to rotate, the mud to stir, and the mud to be injected into the drilling at the fourth flow rate I4.

[0052] The oil pumped out by the third main pump 331 first flows into the flow path L51. A second reversing valve 612 is provided in the flow path L51. In the initial state, the second reversing valve 612 is in the closed state, and the oil flowing into the flow path L51 is cut off by the second reversing valve 612. The oil flowing through the flow path L53 is connected to the pipeline through the second delay valve port 642 and injected into the pilot valve chamber of the second reversing valve 612. After being controlled by the throttle valve for a period of time, the pilot valve chamber is filled with oil, causing the second reversing valve 612 to switch to the conducting state. The oil in the flow path L51 is diverted to the flow paths L12, L42 and L52 through L6, thereby connecting to the power head driver 41, the agitator 53 and the mud driver 52. That is, the oil pumped out by the third main pump 331 does not drive any components to move in the initial state. After a preset period of time, the oil drives the drill pipe 42 to rotate, the mud to stir, and the mud to be injected into the drilling at the fifth flow rate I5.

[0053] It should be noted that in order to achieve normal drilling operation of the portable drilling rig disclosed herein, the first main pump 311, the auxiliary pump 312 and the second main pump 321 need to be turned on at the same time. If the geological conditions require a higher rotation speed of the drill rod 42, or if it is found that deeper geological conditions require a higher rotation speed of the drill rod 42 as the drilling depth increases, the third main pump 331 can be turned on additionally.

[0054] According to the hydraulic valve 60 of the embodiment of the present disclosure, the oil pumped out by the pump assemblies of the three engines 31 can be flexibly distributed, wherein the sequence of the one-way valves in different flow paths being turned on can be achieved by setting the pumping pressure of the pump assemblies or the parameters of the one-way valves, such as Figure 5 As shown (the horizontal axis represents time, and the vertical axis represents the rotation speed of the power head driver 41):

[0055] At time t1, both engines 31 are started simultaneously, causing the first main pump 311, the auxiliary pump 312, and the second main pump 321 to start pumping simultaneously. At this time, oil is pumped into the flow paths L21, L11, L31, and L41. The one-way valve in the flow path L21 is opened first, and the auxiliary pump 312 pumps oil through the flow paths L22 and L23 to drive the clamps to clamp the drill rod 42, and controls the micro-feed driver 44 to move the end of the drill rod 42 to feed against the soil surface. At this time, the drill rod 42 has not yet started to rotate, ensuring that the drill rod 42 is clamped and against the soil surface before starting to rotate and drill.

[0056] At time t2, the pilot valve chamber of the third reversing valve 613 is filled with oil, the third reversing valve 613 is connected, and the flow paths L24 and L25 are connected. The second flow rate I2 drives the drill pipe 42 to rotate at the first low speed v1 to warm up the internal transmission structure of the power head. At the same time, the agitator 53 is started to stir and the mud driver 52 is started to pump mud into the well.

[0057] At time t3, the oil in the flow path L11 passes through the one-way valve. The first flow rate I1 is superimposed on the second flow rate I2 to drive the drill rod 42 to rotate at the second low speed v2, so as to initially drill a circular positioning track on the soil surface. At the same time, the agitator 53 is accelerated to stir the slurry and the mud driver 52 is accelerated to pump the slurry into the well.

[0058] At time t4, the oil in flow path L31 continues to flow through the one-way valve. The third flow rate I3, combined with the first flow rate I1 and the second flow rate I2, drives the drill rod 42 to rotate at a third low speed v3 to drill a certain distance into the shallow loose soil. At the same time, the agitator 53 continues to stir and the mud driver 52 continues to pump mud into the wellbore. The oil in flow path L43 begins to flow into the pilot valve chamber of the first reversing valve 611.

[0059] At time t5, the pilot valve chamber of the first reversing valve 611 is filled with oil, and the first reversing valve 611 is turned on. The oil in the flow path L41 drives the drill rod 42 to rotate at a medium speed v4 with the fourth flow rate I4 superimposed on the second flow rate I2, the third flow rate I3, and the first flow rate I1 to continue drilling into the soil. At this moment, as the first reversing valve 611 is turned on, the well is filled with mud, which can ensure the drilling lubrication requirements of the drill rod 42.

[0060] At time t6, the third engine 31 is started, and the third main pump 331 pumps oil to the flow path L51 and begins to flow into the pilot valve chamber of the second reversing valve 612 through the flow path L53.

[0061] At time t7, the pilot valve chamber of the second reversing valve 612 is filled with oil, and the second reversing valve 612 is turned on. The oil in the flow path L53 drives the drill rod 42 to rotate at a medium speed v5 at the fifth flow rate I5 superimposed on the second flow rate I2, the third flow rate I3, the first flow rate I1, and the fourth flow rate I4, so as to drill deep hard soil. At this moment, as the second reversing valve 612 is turned on, the wellbore is filled with mud again (after a period of drilling, some mud seeps into the soil, causing the lubrication function to decrease), and the drilling lubrication requirements of the drill rod 42 can continue to be met.

[0062] Through the embodiment of the present disclosure, not only can it be ensured that the acceleration action of the drill rod 42 is not started until the mud in the drilling well is fully filled, it can also be ensured that the drill rod 42 will not be worn or stuck each time the acceleration action is performed, and when it is necessary to reduce or stop the operation of the agitator 53 and the mud driver 52, it is only necessary to close the second main pump 321 and the third main pump 331, and the one-way valves provided in the flow paths L41 and L51 are closed, so that the oil returning from the agitator 53 and the mud driver 52 can be directly replenished into the power head driver 41, thereby avoiding the waste of oil pressure caused by the oil returning to the oil tank.

[0063] The description of the embodiments herein and any references to directions and orientations are for ease of description only and are not to be construed as limiting the scope of the present invention. The description of the preferred embodiments may involve combinations of features, which may exist independently or in combination. The present invention is not specifically limited to the preferred embodiments. The scope of the present invention is defined by the claims.

[0064] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A portable drilling rig, characterized in that: include: frame; A moving mechanism, used for driving the drilling rig to move, wherein the moving mechanism is detachably connected to the frame; The power mechanism is provided with three engines, a first main pump, an auxiliary pump, a second main pump and a third main pump. Each of the three engines is equipped with a set of pump assemblies. One of the engines is used as the main engine and is equipped with a double pump assembly, that is, the main pump and the auxiliary pump can work independently. The other two engines are each equipped with a single pump assembly, wherein one engine is connected to the first main pump and the auxiliary pump, and the other two engines are connected to the second main pump and the third main pump respectively. The power head is provided with a power head driver, a drill rod, a clamp and a micro-feed driver. The power head driver is used to drive the drill rod to rotate, and the clamp is used to clamp the power head driver and the drill rod; The mud mechanism is provided with a mud pool, a mud driver and an agitator. The mud driver is used to pump the mud in the mud pool into the well through the drill pipe; The oil pumped out by the three pump assemblies needs to be flexibly distributed to the power head driver, gripper, micro-feed driver, mud driver and agitator through the hydraulic valve. The hydraulic control system oil circuit is formed inside the hydraulic valve. The hydraulic control system oil circuit includes: The oil pumped out by the first main pump first flows into flow path L11, and then is divided into flow paths L12 and L6. The oil flowing through flow path L12 enters the power head driver, and the oil flowing through flow path L6 is further divided into L42 and L52, and finally introduced into the agitator and mud driver respectively. Thus, the oil pumped out by the first main pump drives the drill pipe rotation, mud agitation, and mud injection drilling at the first flow rate I1. The oil pumped out by the auxiliary pump first flows into the flow path L21, and then is divided into the flow paths L24, L22 and L23. The third reversing valve is in the closed state in the initial state. The oil flowing through the flow path L24 is cut off by the third reversing valve. The oil flowing through the flow path L22 flows into the clamper, and the oil flowing through the flow path L23 flows into the micro-feed driver. At the same time, the oil flowing into the flow path L21 is also injected into the pilot valve chamber of the third reversing valve. After being controlled by the throttle valve for a period of time, the pilot valve chamber is filled with oil, so that the third reversing valve is When the three-way reversing valve is switched to the conducting state, the oil in flow path L24 can be diverted to flow paths L12, L42 and L52 after passing through L25 and L6 in sequence, thereby connecting with the power head driver, agitator and mud driver. As a result, the oil pumped out by the auxiliary pump can drive the clamp to clamp the drill pipe and the power head to make micro-feed movements in the initial state. After a preset period of time, the oil pumped out by the auxiliary pump can also drive the drill pipe rotation, mud agitation and mud injection drilling at the second flow rate I2. The oil pumped out by the second main pump flows into flow paths L31 and L41 at the same time. The oil flowing into flow path L31 is divided into flow paths L12, L42 and L53 after passing through L6, and finally enters the power head drive, the agitator and the mud drive respectively, so that the oil pumped out from one interface of the second main pump drives the drill pipe rotation, mud agitation and mud injection drilling at the third flow rate I3. A first reversing valve is provided in flow path L41. In an initial state, the first reversing valve is in a closed state. The oil flowing into flow path L41 is cut off by the first reversing valve. The oil flowing through flow path L43 is injected into the pilot valve chamber of the first reversing valve through the first delay valve port connecting pipeline. After being controlled by the throttle valve for a period of time, the pilot valve chamber is filled with oil, thereby switching the first reversing valve 611 to a conducting state. The oil in flow path L41 is diverted to flow paths L12, L42 and L52 through L6, thereby connecting to the power head driver 41, the agitator and the mud driver. As a result, the oil at the other interface pumped out by the second main pump does not drive any components to move in the initial state. After a preset period of time, the oil at the fourth flow rate I4 simultaneously drives the drill pipe to rotate, the mud to stir, and the mud to be injected into the wellbore. The oil pumped out by the third main pump first flows into the flow path L51. A second reversing valve is provided in the flow path L51. In the initial state, the second reversing valve is in the closed state. The oil flowing into the flow path L51 is cut off by the second reversing valve. The oil flowing through the flow path L53 is injected into the pilot valve chamber of the second reversing valve through the second delay valve port connecting pipeline. After being controlled by the throttle valve for a period of time, the pilot valve chamber is filled with oil, so that the second reversing valve is switched to the conducting state. The oil in the flow path L51 is diverted to the flow paths L12, L42 and L52 through L6, thereby being connected to the power head driver, agitator and mud driver, so that the oil pumped out by the third main pump does not drive any components to move in the initial state. After a preset period of time, the oil drives the drill pipe to rotate, the mud to stir, and the mud to be injected into the drilling at the fifth flow rate I5.

2. A method for controlling the hydraulic system of a portable drilling rig, characterized in that: For the portable drilling rig as claimed in claim 1, the control method comprises: At time t1, both engines are started simultaneously, causing the first main pump, the auxiliary pump, and the second main pump to start pumping simultaneously. At this time, oil is pumped into flow paths L21, L11, L31, and L41. The one-way valve in flow path L21 is opened first, and the auxiliary pump pumps oil through flow paths L22 and L23 to drive the clamp to clamp the drill rod and control the micro-feed driver to move the end of the drill rod to feed against the soil surface. At this time, the drill rod has not yet started to rotate, ensuring that the drill rod is clamped and against the soil surface before starting to rotate and drill. At time t2, the pilot valve chamber of the third reversing valve is filled with oil, the third reversing valve is turned on, and the flow paths L24 and L25 are connected. The second flow rate I2 drives the drill pipe 42 to rotate at the first low speed v1 to warm up the internal transmission structure of the power head. At the same time, the agitator is started to stir and the mud drive is started to pump mud into the well. At time t3, the oil in flow path L11 passes through the one-way valve. The first flow rate I1 is superimposed on the second flow rate I2 to drive the drill pipe to rotate at the second low speed v2, thereby initially drilling a circular positioning track on the soil surface. At the same time, the agitator is accelerated to stir the mud and the mud drive is accelerated to pump mud into the well. At time t4, the oil in flow path L31 continues to flow through the one-way valve. The third flow rate I3, combined with the first flow rate I1 and the second flow rate I2, drives the drill pipe to rotate at a third low speed v3 to drill a certain distance into the shallow loose soil. At the same time, the agitator continues to accelerate and the mud driver continues to pump mud into the well. The oil in flow path L43 begins to flow into the pilot valve chamber of the first reversing valve. At time t5, the pilot valve chamber of the first reversing valve is filled with oil, and the first reversing valve is turned on. The oil in flow path L41, at the fourth flow rate I4, superimposed on the second flow rate I2, the third flow rate I3, and the first flow rate I1, drives the drill pipe to rotate at a medium speed v4 to continue drilling into the soil. At this moment, with the first reversing valve turned on, the wellbore is filled with mud, ensuring the drilling lubrication requirements of the drill pipe. At t6: the third engine is started, and the third main pump pumps oil to the flow path L51 and begins to inject it into the pilot valve chamber of the second reversing valve through the flow path L53; At t7, the pilot valve chamber of the second reversing valve is filled with oil, and the second reversing valve is turned on. The oil in flow path L53, with the fifth flow rate I5 superimposed on the second flow rate I2, the third flow rate I3, the first flow rate I1, and the fourth flow rate I4, drives the drill pipe to rotate at a medium speed v5 to drill deep hard soil. At this moment, as the second reversing valve is turned on, the wellbore is filled with mud again, which can continue to meet the drilling lubrication requirements of the drill pipe.

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