A downhole suspended weight measuring device for hot water drilling tools

Abstract

The invention discloses a downhole suspended weight measuring device for hot water drilling tools, belonging to the field of polar ice layer drilling technology. In the downhole suspended weight measuring device for hot water drilling tools, at least three high-pressure hoses arranged in a spiral shape are sealed and connected between the water-combining tank and the water-dividing tank. At the same time, underwater weighing sensors arranged evenly at intervals around the central axis of the entire downhole suspended weight measuring device for hot water drilling tools are arranged between the water-combining tank and the water-dividing tank. One end of all underwater weighing sensors is connected to a first lifting eye bolt installed at the bottom of the water-dividing tank through a first cable, and the other end is connected to a second lifting eye bolt installed at the top of the water-combining tank through a second cable; the core tube of the hot water drilling tool is sealed and connected to the bottom of the water-combining tank, and the two are coaxially arranged and internally connected. The device proposed by the invention can be arranged on the downhole drilling tool to avoid the problem of large error in measuring the suspended weight of the drilling tool at the bottom of the hole caused by a large proportion of the suspended weight of the high-pressure hose and a small proportion of the suspended weight of the drilling tool when measuring the suspended weight of the drilling tool.

Description

Technical Field

[0001] The invention relates to a suspended weight measuring device, in particular to a downhole suspended weight measuring device for a hot water drilling tool, and belongs to the technical field of polar ice layer drilling. Background Art

[0002] The technical methods for polar ice drilling mainly include mechanical rotary drilling, thermal melt drilling and hot water drilling. Mechanical rotary drilling adopts a rotary cutting method, and the penetration speed usually does not exceed 25 meters / hour, and the drill needs to be lifted repeatedly, so the drilling efficiency is low; thermal melt drilling adopts a contact heat transfer ice melting method. Although there is no need to lift the drill repeatedly, the drilling efficiency can only reach 3 meters / hour; hot water drilling uses hot water to melt the ice layer, which belongs to convection heat transfer ice melting technology. The drilling speed can reach 100 meters / hour, and there is no need to lift the drill repeatedly. It is currently the most efficient drilling technical method in the field of polar ice drilling. During hot water drilling, high-temperature and high-pressure hot water is input into the drill bit at the bottom of the hole through the surface winch and hose in turn. A high-pressure water jet is ejected from the bottom nozzle of the drill bit at the bottom of the hole to melt the ice layer. The jet from the bottom nozzle of the drill bit at the bottom of the hole will form turbulence around the drill bit and cause the drill bit to shake, affecting the drilling stability and the shape and verticality of the borehole. Surface personnel usually judge whether the drill bit is shaking by observing the total mass of the suspended weight of the hose and the downhole drill bit measured on the surface winch, and then adjust the drilling speed. However, this method of monitoring the suspended weight of drilling tools has two main disadvantages: the mass of the downhole hose and the bottom drilling tools is usually hundreds of kilograms, while the turbulent suspended weight fluctuation value generated by the jet of the nozzle at the bottom of the bottom drilling tools is usually several kilograms, and the hose and drilling tools are usually in a downward or upward motion state, so the turbulent fluctuation value of the bottom drilling tools is usually difficult to monitor accurately and effectively; the hose is connected to the drilling tools in a waterway, and the end of the hose and the top of the drilling tools are usually connected by a rigid mechanical seal. The pressure of the hose and the internal waterway of the drilling tools usually fluctuates, and the pressure fluctuation will cause the suspension force at the connection between the end of the hose and the top of the drilling tools to change. Therefore, the load detection device set between the end of the hose and the drilling tools cannot obtain the real suspended weight fluctuation of the drilling tools. The monitoring of the downhole suspended weight value of the drilling tools is extremely important for surface personnel to judge the bottom state of the drilling tools. How to realize the real suspended weight value monitoring of the drilling tools under the condition of internal waterway pressure fluctuation at the bottom of the hole is the main technical problem in hot water drilling projects to ensure smooth hot water drilling, regular borehole shape and reduce the occurrence of accidents in the hole. Summary of the invention

[0003] The purpose of the present invention is to solve the technical problem that in the current hot water drilling process, the actual hanging weight of the drill tool is difficult to detect due to the large error in measuring the hanging weight of the drill tool at the surface winch end and the direct measurement result at the bottom of the hole drill tool is easily affected by the pressure fluctuation of the water channel inside the drill tool. A hot water drill tool downhole hanging weight measurement device is proposed to improve the measurement accuracy of the hanging weight parameters of the drill tool during hot water drilling.

[0004] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a hot water drilling tool downhole hanging weight measuring device, comprising a hot water hose flange joint, a water separation chamber, a high-pressure hose, a water combination chamber, a hot water drilling tool core tube, a first cable, an underwater weighing sensor and a second cable, wherein the hot water hose flange joint and the water separation chamber are detachably fixed together, and a sealing member is arranged between the two to form a sealed connection; the water combination chamber is located directly below the water separation chamber, and at least three high-pressure hoses are sealed and connected between the water combination chamber and the water separation chamber, and each of the high-pressure hoses is spirally arranged, and at least three underwater weighing sensors are also arranged between the water combination chamber and the water separation chamber, and at least three underwater weighing sensors are evenly spaced around the central axis of the entire hot water drilling tool downhole hanging weight measuring device, and all the underwater weighing sensors are connected to a first eye bolt installed at the bottom of the water separation chamber through a first cable at one end, and connected to a second eye bolt installed at the top of the water combination chamber through a second cable at the other end; the hot water drilling tool core tube is sealed and connected to the bottom of the water combination chamber, and the two are coaxially arranged and internally connected.

[0005] Furthermore, the water separation tank is surrounded by a water separation tank shell and a water separation tank end cover located below the water separation tank shell. The water separation tank shell and the water separation tank end cover are connected by second bolts, and a second sealing ring is arranged between the water separation tank shell and the water separation tank end cover.

[0006] Furthermore, the hot water hose flange joint is coaxially arranged with the water diversion chamber shell and is internally connected. The hot water hose flange joint is connected with the water diversion chamber shell by a first bolt, and a first sealing ring is arranged between the hot water hose flange joint and the water diversion chamber shell.

[0007] Furthermore, the water tank is surrounded by a water tank shell and a water tank end cover located above the water tank shell. The water tank end cover and the water tank shell are fixedly connected by a third bolt, and a seventh sealing ring is arranged between the water tank end cover and the water tank shell.

[0008] Furthermore, one end of the high-pressure hose is connected to the interior of the water separation tank through a first watertight head adapter installed on the end cover of the water separation tank, and the other end is connected to the interior of the water combining tank through a second watertight head adapter installed on the end cover of the water combining tank. A fourth sealing ring is provided between the first watertight head adapter and the high-pressure hose, and a fifth sealing ring is provided between the second watertight head adapter and the high-pressure hose.

[0009] Furthermore, the water separation tank end cover is threadedly connected to the first watertight head adapter installed thereon and a third sealing ring is arranged between the two, and the water combination tank end cover is threadedly connected to the second watertight head adapter installed thereon and a sixth sealing ring is arranged between the two.

[0010] Furthermore, the hot water drilling tool core tube is threadedly connected to the water-combining tank shell, and an eighth sealing ring is provided between the hot water drilling tool core tube and the water-combining tank shell.

[0011] The beneficial effects of the downhole suspended weight measuring device for hot water drilling tools provided by the present invention are:

[0012] First, the hanging weight measuring device of the present invention can be arranged on the downhole drilling tool, thereby avoiding the technical problem of large error in measuring the hanging weight of the drilling tool at the bottom of the hole caused by the large proportion of the hanging weight of the high-pressure hose and the small proportion of the hanging weight of the drilling tool when measuring the hanging weight of the drilling tool, and can greatly increase the measurement accuracy of the hanging weight of the drilling tool at the bottom of the hole;

[0013] Second, the hose waterway of the suspended weight measuring device of the present invention includes a coiled high-pressure hose. When the waterway pressure in the high-pressure hose fluctuates, the tension change at both ends of the high-pressure hose caused by the waterway pressure fluctuation is absorbed by the high-pressure hose winding structure itself, and does not affect the value measured by the underwater weighing sensor. Therefore, the suspended weight measuring device of the present invention is not affected by the change of the waterway pressure inside the high-pressure hose;

[0014] Third, the hanging weight measuring device involved in the present invention adopts a columnar, flexible connection structure, which saves space and size, and the hot water drilling tool at the bottom of the hole will remain in a vertical suspension state under the action of gravity, and the radial load on the flange joint end of the hot water hose is less affected. Therefore, the hanging weight measuring device involved in the present invention can increase the verticality of the borehole during hot water drilling;

[0015] Fourthly, the suspended weight measuring device of the present invention has a simple structure, is easy to disassemble, maintain and replace, has a low technical complexity and low technical requirements for personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a cross-sectional view of a downhole suspended weight measuring device for hot water drilling tools;

[0017] Figure 2 for Figure 1 A partial enlarged view of the middle Ⅰ position;

[0018] Figure 3 for Figure 1 A partial enlarged view of the middle II position;

[0019] Figure 4 for Figure 1 A partial enlarged view of the middle III position;

[0020] Figure 5 for Figure 1 A partial enlarged view of the middle IV position;

[0021] Figure 6 for Figure 1 A partial enlarged view of the middle V position;

[0022] Figure 7 It is an isometric top view of the downhole suspended weight measuring device for hot water drilling tools;

[0023] Figure 8 This is an isometric bottom view of the downhole suspended weight measuring device for hot water drilling tools;

[0024] Fig. 9 It is a schematic diagram of the internal fluid flow path of the downhole suspended weight measurement device of the hot water drilling tool;

[0025] The reference numerals in the figure are as follows: 1-hot water hose flange joint; 2-water distribution tank shell; 3-water distribution tank end cover; 4-first lifting eye bolt; 5-first cable; 6-underwater weighing sensor; 7-second cable; 8-second lifting eye bolt; 9-high pressure hose; 10-combined water tank end cover; 11-combined water tank shell; 12-hot water drilling tool core tube; 13-first sealing ring; 14-first bolt; 15-second sealing ring; 16-second bolt; 17-third sealing ring; 18-first watertight head adapter; 19-fourth sealing ring; 20-fifth sealing ring; 21-second watertight head adapter; 22-sixth sealing ring; 23-seventh sealing ring; 24-eighth sealing ring; 25-third bolt. DETAILED DESCRIPTION

[0026] In order to explain the present invention more clearly, the present invention is further described below in conjunction with the accompanying drawings. It should be understood by those skilled in the art that the content described below is illustrative rather than restrictive, and should not be used to limit the scope of protection of the present invention. Unless otherwise defined, the technical terms or scientific terms used herein should be the common meanings understood by people with ordinary skills in the field to which the present invention belongs.

[0027] To avoid obscuring the essence of the present invention, well-known methods, procedures, processes, components and circuits have not been described in detail.

[0028] It should be understood that the terms "first", "second", "third", "fourth", "fifth", "sixth", "seventh" and "eighth" are used for descriptive purposes only, and the characteristics limited to "first", "second", "third", "fourth", "fifth", "sixth", "seventh" and "eighth" do not indicate any order, quantity or importance, but are only used to distinguish different components.

[0029] See also Figures 1 to 8The present invention proposes a hot water drilling tool downhole hanging weight measuring device, comprising a hot water hose flange joint 1, a water separation chamber, a high-pressure hose 9, a water-combining chamber, a hot water drilling tool core tube 12, a first cable 5, an underwater weighing sensor 6 and a second cable 7. The water separation chamber is surrounded by a water separation chamber shell 2 and a water separation chamber end cover 3 located below the water separation chamber shell 2. The water separation chamber shell 2 and the water separation chamber end cover 3 are connected by a second bolt 16, and a second sealing ring 15 is provided between the water separation chamber shell 2 and the water separation chamber end cover 3 to achieve waterway sealing. The hot water hose flange joint 1 is located above the water separation chamber shell 2, the two are coaxially arranged and internally connected, the hot water hose flange joint 1 is connected to the water separation chamber shell 2 by a first bolt 14, and a first sealing ring 13 is provided between the hot water hose flange joint 1 and the water separation chamber shell 2 to achieve waterway sealing. The water tank is surrounded by a water tank shell 11 and a water tank end cover 10 located above the water tank shell 11. The water tank end cover 10 and the water tank shell 11 are fixedly connected by a third bolt 25. A seventh sealing ring 23 is arranged between the water tank end cover 10 and the water tank shell 11 to achieve waterway sealing. At least three high-pressure hoses 9 are sealed and connected between the water tank and the water tank. Each high-pressure hose 9 is spirally arranged, that is, the high-pressure hose 9 itself is a coil structure. All high-pressure hoses 9 are connected to the inside of the water tank through a first watertight head adapter 18 installed on the water tank end cover 3 at one end, and connected to the inside of the water tank through a second watertight head adapter 21 installed on the water tank end cover 10 at the other end. A fourth sealing ring 19 is arranged between the first watertight head adapter 18 and the high-pressure hose 9 to achieve waterway sealing, and a fifth sealing ring 20 is arranged between the second watertight head adapter 21 and the high-pressure hose 9 to achieve waterway sealing. The water separation tank end cover 3 is threadedly connected to the first watertight head adapter 18 installed thereon, and a third sealing ring 17 is arranged between the two to achieve waterway sealing. The water combination tank end cover 10 is threadedly connected to the second watertight head adapter 21 installed thereon, and a sixth sealing ring 22 is arranged between the two to achieve waterway sealing. The hot water drilling tool core tube 12 is threadedly connected to the water combination tank shell 11, the two are coaxially arranged and internally connected, and an eighth sealing ring 24 is arranged between the hot water drilling tool core tube 12 and the water combination tank shell 11 to achieve waterway sealing. At least three underwater weighing sensors 6 are arranged between the water combination tank and the water separation tank, and at least three underwater weighing sensors 6 are evenly spaced around the central axis of the entire hot water drilling tool downhole hanging weight measurement device. All underwater weighing sensors 6 are connected to the first eye bolt 4 installed at the bottom of the water separation tank through the first cable 5 at one end, and connected to the second eye bolt 8 installed at the top of the water combination tank through the second cable 7 at the other end.When the hot water drilling tool is suspended, since the high-pressure hose 9 itself is a coil structure, the hanging weight of the hot water drilling tool is borne by the array of underwater weighing sensors 6, the first cable 5, the second cable 7, the first lifting eye bolt 4 and the second lifting eye bolt 8 arranged between the water separation tank end cover 3 and the water combination tank end cover 10. The hanging weight of the drilling tool is the sum of the hanging weight values ​​measured by the at least three underwater weighing sensors 6 arranged.

[0030] Fig. 9 The figure is a schematic diagram of the internal fluid of the downhole suspended weight measuring device of the hot water drilling tool. When the hot water flows into the hot water hose flange joint 1, it first enters the water separation chamber shell 2, and then the hot water is distributed to several first watertight head adapters 18 and matching high-pressure hoses 9 through the water separation chamber end cover 3. In the description of the present invention, the meaning of "several" is at least three, such as three, four, etc., unless otherwise clearly and specifically defined, the hot water in several high-pressure hoses 9 is collected through the second watertight head adapter 21 and flows into the combined water chamber formed by the combined water chamber end cover 10 and the combined water chamber shell 11, and finally input into the hot water drilling tool through the hot water drilling tool core tube 12. If there is pressure fluctuation of the high-pressure hot water input by the hot water hose flange joint 1, the tension change of the high-pressure hose 9 caused by the pressure fluctuation will be released by the coiling structure of the high-pressure hose 9 itself, so the pressure change of the fluid inside the suspended weight measuring device will not cause the fluctuation of the suspended weight value of the drilling tool measured by the underwater weighing sensor 6.

Claims

1. A downhole suspended weight measuring device for hot water drilling tools, characterized in that: include: A hot water hose flange joint (1), a water separation chamber, a high-pressure hose (9), a water combination chamber, a hot water drilling tool core tube (12), a first cable (5), an underwater weighing sensor (6) and a second cable (7), wherein the hot water hose flange joint (1) and the water separation chamber are detachably fixed together, and a sealing member is provided between the two to form a sealed connection; the water combination chamber is located directly below the water separation chamber, and at least three high-pressure hoses (9) are sealedly connected between the water combination chamber and the water separation chamber, and each of the high-pressure hoses (9) is spirally arranged, and at the same time, a sealing member is provided between the water combination chamber and the water separation chamber. At least three underwater weighing sensors (6) are also arranged between the water separation tanks, and the at least three underwater weighing sensors (6) are evenly spaced around the central axis of the entire hot water drilling tool downhole hanging weight measuring device, and all the underwater weighing sensors (6) are connected to a first lifting eye bolt (4) installed at the bottom end of the water separation tank through a first cable (5), and are connected to a second lifting eye bolt (8) installed at the top end of the water combination tank through a second cable (7); the hot water drilling tool core tube (12) is sealed and connected to the bottom of the water combination tank, and the two are coaxially arranged and internally connected.

2. The downhole suspended weight measuring device for hot water drilling tools according to claim 1, characterized in that: The water separation chamber is surrounded by a water separation chamber shell (2) and a water separation chamber end cover (3) located below the water separation chamber shell (2); the water separation chamber shell (2) and the water separation chamber end cover (3) are connected by a second bolt (16), and a second sealing ring (15) is provided between the water separation chamber shell (2) and the water separation chamber end cover (3).

3. The downhole suspended weight measuring device for hot water drilling tools according to claim 2, characterized in that: The hot water hose flange joint (1) is coaxially arranged with the water separation chamber shell (2) and is internally connected. The hot water hose flange joint (1) and the water separation chamber shell (2) are connected via a first bolt (14), and a first sealing ring (13) is arranged between the hot water hose flange joint (1) and the water separation chamber shell (2).

4. The downhole suspended weight measuring device for hot water drilling tools according to claim 2, characterized in that: The water tank is surrounded by a water tank shell (11) and a water tank end cover (10) located above the water tank shell (11); the water tank end cover (10) and the water tank shell (11) are fixedly connected by a third bolt (25); and a seventh sealing ring (23) is provided between the water tank end cover (10) and the water tank shell (11).

5. The downhole suspended weight measuring device for hot water drilling tools according to claim 4, characterized in that: One end of the high-pressure hose (9) is connected to the interior of the water separation tank via a first watertight head adapter (18) mounted on the water separation tank end cover (3), and the other end is connected to the interior of the water combination tank via a second watertight head adapter (21) mounted on the water combination tank end cover (10). A fourth sealing ring (19) is provided between the first watertight head adapter (18) and the high-pressure hose (9), and a fifth sealing ring (20) is provided between the second watertight head adapter (21) and the high-pressure hose (9).

6. The downhole suspended weight measuring device for hot water drilling tools according to claim 5, characterized in that: The water separation tank end cover (3) is threadedly connected to a first watertight head adapter (18) installed thereon, and a third sealing ring (17) is provided between the two. The water combination tank end cover (10) is threadedly connected to a second watertight head adapter (21) installed thereon, and a sixth sealing ring (22) is provided between the two.

7. The downhole suspended weight measuring device for hot water drilling tools according to claim 4, characterized in that: The hot water drilling tool core tube (12) is threadedly connected to the water-combining chamber shell (11), and an eighth sealing ring (24) is provided between the hot water drilling tool core tube (12) and the water-combining chamber shell (11).

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