A WOB integrated drill pipe

Abstract

This utility model discloses an integrated drilling and fracturing drill pipe, comprising a drill pipe body, on which a sealing and fracturing mechanism is assembled and connected; the sealing and fracturing mechanism includes a first drilling and fracturing sealing structure detachably installed at the fluid outlet end of the drill pipe body and a second drilling and fracturing sealing structure detachably installed at the water outlet end of the first drilling and fracturing sealing structure; both the first and second drilling and fracturing sealing structures include a drill pipe and a sealing bag installed on the drill pipe; the sealing bag communicates with a flow channel inside the drill pipe; it also includes a water jet fracturing structure opened on the drill pipe, located between the two sealing bags. The above structure solves the technical problem of the difficulty in completely integrating drilling and fracturing, and achieves seamless "two-plug-one-injection" drilling operations without changing the borehole diameter.

Description

Technical Field

[0001] This utility model belongs to the field of drill pressure drill pipe technology, and in particular relates to an integrated drill pressure drill pipe. Background Technology

[0002] Hydraulic fracturing and stress relief technology for coal mine roadways is an effective means of preventing large deformation of the surrounding rock. By inducing the expansion of roof cracks through directional high-pressure water injection, a collapse joint is formed to release stress, which significantly reduces the subsidence of the roadway roof and the convergence of the sidewalls (the deformation rate can be reduced to less than 10%).

[0003] In existing technologies, hydraulic fracturing operations are typically carried out in steps: first, conventional drill pipes (94mm in diameter) are used to complete drilling and slag removal; then, the drill pipes are removed and a special sealing device is installed; finally, the system is connected to a high-pressure pump station for fracturing. This process requires multiple equipment changes, has a long construction cycle (adding 20-30 minutes per borehole), causes significant disturbance, and is prone to borehole collapse or sealing failure, especially in fine sandstone strata (RMR < 30) at the ends of coal mine roadways, where the operation is risky and inefficient.

[0004] The existing drill pipe structure does not solve the problem of complete integration between drilling and fracturing separation. It cannot achieve seamless connection of "two plugs and one injection" (double sealing and one injection) without changing the borehole diameter. In particular, it lacks the stability of the anti-rotation bag under high-speed drilling and the automatic switching mechanism of the pressure threshold, resulting in technical defects such as equipment redundancy and increased costs (15%-25%). Utility Model Content

[0005] Based on the above background, the purpose of this utility model is to provide an integrated drill rod for drilling and pressing.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A drill pipe with integrated drilling and pressure control includes a drill pipe body, and a sealing and crack opening mechanism is assembled and connected to the drill pipe body; The sealing and cracking mechanism includes a first drilling pressure sealing structure that can be detachably installed at the liquid outlet end of the drill pipe body and a second drilling pressure sealing structure that can be detachably installed at the water outlet end of the first drilling pressure sealing structure. Both the first drill-pressure sealing structure and the second drill-pressure sealing structure include a drill rod and a sealing bag installed on the drill rod. The sealing bag is connected to the flow channel inside the drill pipe; It also includes a water jet cracking structure installed on the drill pipe, located between the two sealing bags.

[0007] Preferably, the first drill pressure sealing structure includes a first drill rod installed on the drill rod body, and a first sealing bag is installed on the first drill rod; Both ends of the first sealing bag are locked and sealed on the first drill pipe by the first clamps.

[0008] Preferably, the first drill pipe has a first injection hole that connects to the first sealing bag, and a first one-way valve is installed on the first injection hole.

[0009] Preferably, the second drill-pressure sealing structure includes a second drill rod on which the first drill rod is mounted; The second drill pipe is equipped with a second sealing bag; The two ends of the second sealing bag are locked and sealed on the second drill pipe by the second clamps.

[0010] Preferably, the second drill pipe has a second injection hole that connects to the second sealing bag, and a second one-way valve is installed on the second injection hole.

[0011] Preferably, the water jet cracking structure includes a water jet nozzle hole formed on the second drill rod, and the water jet nozzle hole is connected to a flow channel on the second drill rod; The water jet nozzle orifice is located on the outside of the second sealing bag; A third check valve is installed on the water jet nozzle orifice.

[0012] Preferably, a hydraulically controlled drill rod structure is detachably installed at the liquid outlet end of the second drill rod; and a water-discharging drill bit is detachably installed at the liquid outlet end of the hydraulically controlled drill rod structure.

[0013] Preferably, the hydraulic drill pipe structure includes a hydraulic drill pipe body, and a fourth one-way valve for controlling the flow of fluid is installed in the flow channel inside the hydraulic drill pipe body.

[0014] Preferably, the hydraulic drill rod body and the second drill rod; the first drill rod and the second drill rod; and the first drill rod and the drill rod body are detachably and fixedly connected by threaded connections.

[0015] This utility model has the following beneficial effects: 1. This utility model discloses an integrated drilling and pressure drill pipe, which achieves in-situ switching between low-pressure slag discharge and high-pressure fracturing through the innovative structure of a double-layer first sealing bag and a second sealing bag. It is suitable for pressure relief in roadways with a standard borehole diameter of 94mm and improves work efficiency by more than 30%.

[0016] 2. It solves the technical problem of the difficulty in fully integrating drilling and fracturing, and solves the problem of achieving seamless connection of "two plugs and one injection" (double sealing and one injection) drilling operations without changing the borehole diameter.

[0017] 3. By improving the drill rod structure, the drill rod integrates end sealing, water injection cracking, and drilling into one integrated structure. This not only simplifies the structure but also increases the operating efficiency of the drill rod and reduces the manufacturing cost of the drill rod to achieve the operating purpose. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure in an embodiment of the present utility model; Figure 2 This is a schematic diagram of the drill rod body and the second drill pressure sealing structure in an embodiment of the present invention; Figure 3 This is a schematic diagram of the second drill-press sealing structure and the first drill-press sealing structure in the embodiments of this utility model; Figure 4 This is a schematic diagram of the structure of the water-discharge drill bit and hydraulic control drill rod in the embodiment of this utility model.

[0020] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0023] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0024] Example 1 like Figure 1-4 As shown, an integrated drilling and pressure drill pipe includes a drill pipe body 1. The drill pipe body 1 is a high-pressure water-sealed drill pipe disclosed in the prior art. In order to realize the two-plug-one-injection fracturing and hole enlargement operation during the drilling operation, this utility model makes the following improvements: The drill pipe body 1 is equipped with a sealing and crack-opening mechanism. Specifically, the sealing and crack-opening mechanism includes a first drill pressure sealing structure 2 that is detachably installed at the fluid outlet end of the drill pipe body 1 and a second drill pressure sealing structure 3 that is detachably installed at the water outlet end of the first drill pressure sealing structure 2.

[0025] Specifically, both the first drill pressure sealing structure 2 and the second drill pressure sealing structure 3 include a drill rod and a sealing bag installed on the drill rod; the sealing bag is connected to the flow channel inside the drill rod; and also includes a water jet cracking structure opened on the drill rod, which is located between the two sealing bags.

[0026] After high-pressure water is injected into the sealing bags, the sealing bags on both sides expand to seal both ends of the borehole. After sealing, high-pressure water is injected into the drill rod body 1. The high-pressure water is ejected from the water jet cracking structure and forms a water jet to further crack and enlarge the borehole.

[0027] Example 2 like Figure 1-4 As shown, this embodiment, based on the structure of embodiment 1, specifically discloses the specific structures of the first drill-pressure sealing structure 2 and the second drill-pressure sealing structure 3.

[0028] Specifically, the first drill pressure sealing structure 2 includes a first drill rod 21 (water injection drill rod with internal flow channels) installed on the drill rod body 1. A first sealing bag 22 (10MPa threshold trigger, expansion radial increment 20-30mm, suitable for 94mm hole diameter sealing rate >95%) is installed on the first drill rod 21. The two ends of the first sealing bag 22 are respectively tightened and sealed on the first drill rod 21 by the first clamp lock 221.

[0029] The first drill pipe 21 has a first injection hole 211 that connects to the first sealing bag 22. According to the existing method, a first one-way valve (not shown in the figure) is installed on the first injection hole.

[0030] Similarly, the second drill pressure sealing structure 3 includes a second drill rod 31 (water injection drill rod with internal flow channels) on which the first drill rod 21 is installed; the second drill rod 31 is equipped with a second sealing bag 32; the two ends of the second sealing bag 32 are respectively locked and sealed on the second drill rod 31 by the second clamp 321.

[0031] The second drill pipe 31 has a second injection hole 311 that connects to the second sealing bag 32, and a second one-way valve (not shown in the figure) is installed on the second injection hole 311.

[0032] During operation, when high-pressure water of a certain pressure enters the first drill rod 21 and the second drill rod 31 after being injected from the drill rod body 1, the water pressure reaches the pressure threshold for opening the first check valve and the second check valve. At this time, the first check valve and the second check valve open, the first sealing bag 22 and the second sealing bag 32 are filled with water and expand, and form a seal.

[0033] When the first sealing bag 22 and the second sealing bag 32 are filled with water and expand, forming a seal at both ends, the water pressure further increases until the water jet cracks and forms a water jet.

[0034] Example 3 like Figure 1-4 As shown, based on the structure of Embodiment 2, the water jet cracking structure includes a water jet nozzle hole 312 opened on the second drill rod 31, and the water jet nozzle hole 312 is connected to the flow channel on the second drill rod 31; the water jet nozzle hole 312 is located on the outside of the second sealing bag 32 (that is, the water jet nozzle hole 312 is located between the first sealing bag 22 and the second sealing bag 32 on both sides).

[0035] Similarly, a third check valve is installed on the water jet nozzle orifice 312.

[0036] When the water pressure reaches 40MPa, the third one-way valve opens, and high-pressure water is sprayed out from the water jet nozzle hole 312 to form a water jet to crack and enlarge the drilled groove.

[0037] Example 4 like Figure 1-4 As shown, in this embodiment, based on the structure of embodiment 3, a hydraulic control drill rod structure 4 is detachably installed at the liquid outlet end of the second drill rod 31; a water outlet drill bit 5 (the water outlet drill bit 5 is a conventional water outlet drill bit 5 disclosed in the prior art, with a water outlet hole on the drill bit) is detachably installed at the liquid outlet end of the hydraulic control drill rod structure 4.

[0038] The hydraulic drill pipe structure 4 includes a hydraulic drill pipe body 41 (similarly, the hydraulic drill pipe body 41 has a water flow channel). According to the conventional structure of controlling the drainage of the flow channel, a fourth one-way valve 42 for controlling the flow of fluid is installed in the flow channel inside the hydraulic drill pipe body 41.

[0039] During the work process, the first stage is the drilling operation: The crawler drilling rig is used to advance the drill rod, which is part of the drill bit, into the fine sandstone roof of the roadway (dip angle 40°-55°, depth 6-10m). Low-pressure emulsion (flow rate 4-8L / min) at pressures up to 10MPa is injected into the internal channel. The fourth check valve 42 is opened (the other check valves are closed), allowing liquid to flow out of the drill bit for cooling and slag removal (slag removal rate >90%), without affecting drilling efficiency. All sealing bags are in a contracted state, preventing borehole interference and ensuring smooth borehole formation.

[0040] Secondly, during the fracturing operation phase: After drilling is completed, the emulsion system at the working face is directly connected (without an additional pump station), and the injection pressure is gradually increased to 40-60 MPa. Under the action of high-pressure water, the fourth one-way valve 42 automatically closes (pressure difference > 12 MPa) to prevent liquid backflow; the first sealing bag 22 and the second sealing bag 32 on both sides of the outer layer expand under pressure (triggered by a 10 MPa threshold, expansion radial increment of 20-30 mm, adaptable to a 94 mm diameter hole with a sealing rate > 95%), achieving "double plugging" sealing (forming an isolation chamber between the sealing bags at both ends).

[0041] After the first sealing bag 22 and the second sealing bag 32 expand, when the pressure reaches more than 40MPa, the intermediate water jet fracturing structure is opened through the mechanical pressure sensitive mechanism. High-pressure water (40-60MPa) is injected in a directional manner to induce the expansion of the fracture, forming a "two-plug-one-injection" fracturing mode.

[0042] Fracturing continues for 8-15 minutes per segment until water flow from the adjacent well exceeds 5 minutes or pressure falls below 5 MPa. The process is then repeated using a retreating, segmented approach (each segment 2-3 meters). Monitoring parameters include the expansion displacement of the plugging bag (<5 mm deviation) and the fracture width (0.5-1 mm).

[0043] Example 5 like Figure 1-4 As shown, in this embodiment, based on the structure of embodiment 4, the hydraulic control drill rod body 41 and the water-discharge drill bit 5, as well as the hydraulic control drill rod body and the second drill rod 31; the first drill rod 21 and the second drill rod 31; and the first drill rod 21 and the drill rod body are respectively detachably and fixedly connected by threaded connection.

[0044] During installation, the entire drill rod structure is assembled by sequentially connecting the drill rod body 1, the first drill rod 21, the second drill rod 31, the hydraulic drill rod body 41, and the water-discharge drill bit 5 using threaded connections.

[0045] Specifically, at both ends of the aforementioned drill rod, a threaded connection point A is designed on one side as the water outlet end, and a threaded connection cavity B is opened on the water inlet end to connect with the drill rod of the previous stage (similarly, a threaded connection point A is opened on the water outlet drill bit 5 to connect with threaded connection point A). During assembly, the drill rods are assembled sequentially according to the threaded connection method.

[0046] Of course, the above description is not intended to limit the present utility model, and the present utility model is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present utility model should also fall within the protection scope of the present utility model.

Claims

1. A drill pipe with integrated drilling and pressure, characterized in that, Includes the drill pipe body, which is equipped with a crack sealing and breaking mechanism; The sealing and cracking mechanism includes a first drilling pressure sealing structure that can be detachably installed at the liquid outlet end of the drill pipe body and a second drilling pressure sealing structure that can be detachably installed at the water outlet end of the first drilling pressure sealing structure. Both the first drill-pressure sealing structure and the second drill-pressure sealing structure include a drill rod and a sealing bag installed on the drill rod. The sealing bag is connected to the flow channel inside the drill pipe; It also includes a water jet cracking structure installed on the drill pipe, located between the two sealing bags.

2. The drill pipe with integrated drilling and pressure as described in claim 1, characterized in that, The first drill pressure sealing structure includes a first drill rod installed on the drill rod body, and a first sealing bag is installed on the first drill rod; Both ends of the first sealing bag are locked and sealed on the first drill pipe by the first clamps.

3. The drill pipe with integrated drilling and pressure as described in claim 2, characterized in that, The first drill pipe has a first injection hole that connects to the first sealing bag, and a first one-way valve is installed on the first injection hole.

4. The drill pipe with integrated drilling and pressure as described in claim 3, characterized in that, The second drill-pressure sealing structure includes a second drill rod on which the first drill rod is mounted; The second drill pipe is equipped with a second sealing bag; The two ends of the second sealing bag are locked and sealed on the second drill pipe by the second clamps.

5. The drill pipe with integrated drilling and pressure as described in claim 4, characterized in that, The second drill pipe has a second injection hole that connects to the second sealing bladder, and a second one-way valve is installed on the second injection hole.

6. The drill pipe with integrated drilling and pressure control according to claim 4, characterized in that, The water jet cracking structure includes a water jet nozzle hole formed on the second drill rod, and the water jet nozzle hole is connected to the flow channel on the second drill rod; The water jet nozzle orifice is located on the outside of the second sealing bag; A third check valve is installed on the water jet nozzle orifice.

7. The drill pipe with integrated drilling and pressure control according to claim 4, characterized in that, The second drill rod has a detachable hydraulic drill rod structure at the liquid outlet end; the hydraulic drill rod structure has a detachable water-discharging drill bit at the liquid outlet end.

8. The drill pipe with integrated drilling and pressure control according to claim 7, characterized in that, The hydraulic drill pipe structure includes a hydraulic drill pipe body, and a fourth one-way valve for controlling the flow of fluid is installed in the flow channel inside the hydraulic drill pipe body.

9. The drill pipe with integrated drilling and pressure as described in claim 8, characterized in that, The hydraulic drill rod body and the second drill rod; the first drill rod and the second drill rod; and the first drill rod and the drill rod body are detachably and fixedly connected by threaded connections.

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