Offshore directional drilling system and jam-releasing method

Abstract

The present application discloses a offshore directional drilling system and a method for unstuck drilling. The offshore directional drilling system includes a drilling rig and an unstuck drilling device. The drilling rig includes a drilling rig body, a drill tool assembly, and a detection instrument. The drilling rig body is connected to the drill tool assembly, which is connected to a target pipeline. The detection instrument is configured to detect the torque of the drilling rig body. The unstuck drilling device is configured to connect to the drilling rig body when a stuck drill occurs and deliver an unstuck medium into the drill tool assembly to increase the pressure within the drill tool assembly to greater than the external pressure. When a stuck drill occurs, the torque of the drilling rig body exceeds a set threshold. The offshore directional drilling system disclosed in the present application can promptly detect an underwater stuck drill and unstuck it using an unstuck drilling method, thereby ensuring smooth towing back of the submarine pipeline.

Description

Technical Field

[0001] The present application relates to the field of offshore oil engineering technology, and in particular to a sea directional drilling system and a method for unstuck drilling. Background Art

[0002] Offshore oil and gas are primarily transported via submarine pipelines. Traditionally, the landing method involves pre-excavating, hauling, and backfilling the landing section. However, this method can significantly damage the landforms of the coastline where the pipeline lands, significantly impacting the environment.

[0003] The offshore directional drilling technology is a more economical and reliable submarine pipeline landing construction process. The submarine pipeline can be drilled out from a certain location underground by pulling back the drill rod, which has the effect of protecting the coastline landform.

[0004] However, during the process of towing back the submarine pipeline, the seabed surface is mostly sandy and prone to collapse. Therefore, the directional drilling equipment can be easily buried by the collapsed sand layer, causing the drill pipe to become stuck in the sand, significantly increasing the torque and drag force of the drilling rig. In this underwater environment, conventional mud circulation systems are unable to effectively free the seabed, resulting in increased project risks and even the failure of the submarine pipeline towing back. Summary of the Invention

[0005] In view of this, the present application provides a sea directional drilling system and a method for unstuck drilling, which can promptly detect underwater stuck drill and unstuck drill, thereby ensuring the smooth towing back of the submarine pipeline.

[0006] This application specifically adopts the following technical solutions:

[0007] One aspect of the present application is to provide a sea directional drilling system, the system comprising a drilling rig device and a jamming release device;

[0008] The drilling rig device includes a drilling rig body, a drill tool assembly, and a detection instrument, wherein the drilling rig body is connected to the drill tool assembly, the drill tool assembly is connected to the target pipe, and the detection instrument is configured to detect the torque of the drilling rig body;

[0009] The unstuck device is configured to connect to the drill body when a drill stuck phenomenon occurs, and to deliver a unstuck medium into the drill tool assembly so that the pressure inside the drill tool assembly is greater than the external pressure, wherein the torque of the drill body is greater than a set threshold when the drill stuck phenomenon occurs.

[0010] Preferably, the jam-releasing device comprises an air compressor, and the jam-releasing medium is compressed air.

[0011] Preferably, the jam-releasing device further comprises a hose, one end of which is connected to the air compressor, and the other end of which is connected to the drilling rig body.

[0012] Preferably, the drilling rig device further comprises a mud pump, and the mud pump is configured to be connected to the drilling rig body before the pipe sticking phenomenon occurs, so as to pull the target pipe.

[0013] Preferably, the drilling tool assembly comprises a plurality of drill rods, a reamer and a drag head connected in sequence, wherein the drill rods are connected to the drilling rig body, and the drag head is connected to the target pipe.

[0014] Another aspect of the present application is to provide a card unlocking method, the method comprising:

[0015] When the drill is stuck, connect the drill body to the jam release device;

[0016] activating the jam-releasing device to deliver a jam-releasing medium into the drill assembly;

[0017] When the jam-releasing medium is detected at the position where the drill tool assembly is locked, the drilling rig body is started.

[0018] Preferably, the jam-releasing device is an air compressor, the jam-releasing medium is compressed air, the drill tool assembly comprises a plurality of drill rods, a reamer and a drag head connected in sequence, the drill rods are connected to the drilling rig body, and the drag head is connected to the target pipeline;

[0019] When the reamer is stuck in the sand, the drill sticking phenomenon occurs.

[0020] Preferably, when the drill is stuck, before connecting the drill body to the unstuck device, the method further comprises:

[0021] The drilling rig body drags the target pipeline under the drive of a mud pump, and the mud pump is connected to the drilling rig body;

[0022] acquiring the torque of the drilling rig body, and determining that the drill sticking phenomenon occurs when the torque is greater than a set threshold;

[0023] The mud pump and the drilling rig body are stopped, and the mud pump is disconnected from the drilling rig body.

[0024] Preferably, the detecting that the jam-releasing medium appears at the position where the drill assembly is locked includes:

[0025] Observe the sand layer where the reamer is located;

[0026] When bubbles are observed to overflow from the sand layer where the reamer is located, it is determined that the de-jamming medium is present at the location where the drill assembly is stuck.

[0027] Preferably, the method further comprises:

[0028] After the stroke of the current drill rod ends, the jam release device is closed and the pressure relief valve is opened, wherein the current drill rod is the drill rod directly connected to the drilling rig body among the multiple drill rods;

[0029] When it is detected that the pressure in the current drill pipe is consistent with the atmospheric pressure, the pressure relief valve is closed and the current drill pipe is disassembled;

[0030] The drilling rig body is connected to a target drill rod, where the target drill rod is a drill rod directly connected to the current drill rod among the multiple drill rods.

[0031] The beneficial effects of the embodiments of the present application are at least:

[0032] The offshore directional drilling system disclosed in the embodiment of the present application is not only capable of towing the target pipeline located on the seabed, but also has a jamming release function. When the detection instrument detects that the torque of the drilling rig body is greater than the set threshold, it can be determined that the drill tool assembly is stuck in sand and soil, and a drill is stuck. At this time, the jamming release device can be connected to the drilling rig body, and the jamming release device can be started to deliver a jamming medium into the drilling rig body, so that the pressure in the drill tool assembly is greater than the external pressure. In this way, the pressure in the drill tool assembly can flush away the sand and soil that is stuck in the drill tool assembly, so that the drill tool assembly is unstuck, and the smooth towing back of the submarine pipeline is ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0034] Figure 1 This is a structural diagram of a sea directional drilling system provided in an embodiment of the present application;

[0035] Figure 2 This is a card unlocking method provided by an embodiment of the present application;

[0036] Figure 3 This is another card unlocking method provided in an embodiment of the present application.

[0037] The reference numerals represent:

[0038] 100. Drilling rig; 110. Drilling rig body; 120. Drilling tool assembly; 121. Drill rod; 122. Reamer; 123. Universal joint; 124. Drag head;

[0039] 200, jam release device; 210, air compressor; 220, hose;

[0040] 300, target pipeline;

[0041] 400. Barge; 410. Anchor cable.

[0042] The above drawings illustrate specific embodiments of the present application, which will be described in more detail below. These drawings and the textual description are not intended to limit the scope of the present application in any way, but rather to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0044] like Figure 1 As shown, an embodiment of the present application provides a sea directional drilling system, which includes a drilling rig device 100 and a jamming release device 200.

[0045] The drilling rig device 100 includes a drilling rig body 110 , a drill assembly 120 and a detection instrument. The drilling rig body 110 is connected to the drill assembly 120 , and the drill assembly 120 is connected to the target pipe 300 . The detection instrument is configured to detect the torque of the drilling rig body 110 .

[0046] The unstuck device 200 is configured to connect to the drill body 110 when a drill stuck phenomenon occurs, and to deliver a unstuck medium into the drill assembly 120 so that the pressure inside the drill assembly 120 is greater than the external pressure, wherein the torque of the drill body 110 is greater than a set threshold when a drill stuck phenomenon occurs.

[0047] The offshore directional drilling system disclosed in the embodiment of the present application, in addition to being able to tow the target pipeline 300 located on the seabed, also has a jamming release function. When the detection instrument detects that the torque of the drilling rig body 110 is greater than a set threshold, it can be determined that the drill tool assembly 120 is stuck in sand and soil, and a drill is stuck. At this time, the jamming release device 200 can be connected to the drilling rig body 110, and the jamming release device 200 can be started to deliver a jamming medium into the drilling rig body 110, so that the pressure in the drill tool assembly 120 is greater than the external pressure. In this way, the pressure in the drill tool assembly 120 can flush away the sand and soil that is stuck in the drill tool assembly 120, so that the drill tool assembly 120 is unstuck, ensuring the smooth towing back of the submarine pipeline.

[0048] For the convenience of description, the following Figure 1 , further introduces and illustrates a sea directional drilling system provided in an embodiment of the present application.

[0049] like Figure 1 As shown, the offshore directional drilling system provided in the embodiment of the present application is applied to a submarine pipeline, and can move the submarine pipeline from its current position to a target position. In the embodiment of the present application, since it is difficult to directly deploy the offshore directional drilling system on the sea surface, a barge 400 can be used as a deployment platform for the offshore directional drilling system. For example, the offshore directional drilling system can be assembled on the barge 400. In order to ensure the stability of the barge 400, as shown in FIG. Figure 1 As shown, the barge 400 may also be secured using an anchor cable 410 .

[0050] like Figure 1 As shown, the offshore directional drilling system according to the embodiment of the present application includes a drilling rig device 100 and a jamming release device 200 , wherein the drilling rig device 100 includes a drilling rig body 110 and a drilling tool assembly 120 , and both the drilling rig body 110 and the jamming release device 200 are located on a barge 400 .

[0051] The drilling rig body 110 can be connected to the drilling tool assembly 120, and the drilling tool assembly 120 can be connected to the target pipeline 300 located on the seabed. After the drilling rig body 110 is started, the drilling tool assembly 120 can be driven to drag the target pipeline 300, thereby moving the target pipeline 300 from the current position to the target position.

[0052] Because the drill assembly 120 is towing the target pipeline 300 on the seabed, the towing process can cause sand collapse, which can easily bury the drill assembly 120, causing the drill rod 121 to become stuck in the sand. This can significantly increase the torque of the drilling rig 110, requiring greater pulling force, leading to operational risks and potentially even causing the target pipeline 300 to fail to be towed back.

[0053] Therefore, to more promptly detect a stuck drill, in this embodiment of the present application, the drilling apparatus 100 may further include a detection instrument configured to detect the torque of the drill body 110. When the torque displayed on the detection instrument exceeds a set threshold, a stuck drill is considered to have occurred. Generally speaking, under normal operating conditions, the torque of the drill body 110 is approximately 20,000 N·m. When a stuck drill occurs, the torque of the drill body 110 increases rapidly, potentially reaching 60,000 to 70,000 N·m.

[0054] To prevent accidents caused by workers failing to promptly notice excessive torque displayed by the instrument, in some embodiments, the drilling apparatus 100 further includes a controller and an alarm. The controller can be electrically connected to the alarm and the instrument. For example, the controller can obtain and analyze the torque of the drill body 110 as detected by the instrument. When the controller determines that the torque of the drill body 110 exceeds a set threshold, the controller can send an alarm signal to the alarm. Upon receiving the alarm signal, the alarm can emit an audible / visual alarm signal to alert workers that the torque of the drill body 110 is excessive and a drill bit may be stuck.

[0055] When a stuck drill bit occurs, the release device 200 is typically connected to the drilling rig body 110 and delivers a release medium into the drill assembly 120. Since the drill assembly 120 is typically a sealed environment after a stuck drill bit occurs, the delivery of the release medium into the drill assembly 120 increases the pressure within the drill assembly 120 to a level greater than the external pressure. Under this pressure, the sand and soil that is blocking the drill assembly 120 is dislodged by the release medium, releasing the drill assembly 120 and unblocking it, thereby ensuring smooth retraction of the submarine pipeline.

[0056] In some implementations of the present application, the jam-releasing device 200 is a liquid pump, and the jam-releasing medium is seawater.

[0057] Because pipeline towing construction takes place in an ocean environment, the most direct method is to pump seawater directly using a liquid pump. When the water pressure within the drill assembly 120 exceeds the external pressure, the seawater will dislodge the sand and soil that is blocking the drill assembly 120, allowing the drill assembly 120 to resume rotation and continue to tow the target pipeline 300.

[0058] However, in some cases, despite the relatively high pressure within drill assembly 120, the unstuck seawater within drill assembly 120 encounters significant external resistance as it impacts the outside of drill assembly 120, resulting in a very short effective travel distance for the unstuck seawater. Testing has shown this effective travel distance to be approximately 10 to 20 cm. Consequently, when drill assembly 120 is heavily buried in sand, the unstuck seawater may not be sufficient to completely dislodge the sand, effectively unblocking the stuck drill assembly 120 and causing unstuck failure.

[0059] In order to overcome the above problems, increase the effective movement distance of the card release medium, and improve the success rate of card release, in other implementations of the embodiments of the present application, the card release device 200 may include an air compressor 210, and accordingly, the card release medium is compressed air.

[0060] Air compressor 210 pumps compressed air into drill assembly 120, increasing the air pressure inside drill assembly 120 to a greater level than the external pressure. Compared to pumping liquid media, compressed air gradually expands in water. Furthermore, air has a much lower density than seawater and sand, so it naturally rises in the seawater. This increases the effective distance of air movement, making it easier to dissipate sand and greatly improves the success rate of unblocking the drill.

[0061] Among them, such as Figure 1 As shown, in the above embodiment, when the jam releasing device 200 includes an air compressor 210, the jam releasing device 200 also includes a hose 220, one end of the hose 220 is connected to the air compressor 210, and the other end is connected to the drilling rig body 110, and the compressed air is delivered to the drill tool assembly 120 through the hose 220.

[0062] In the embodiment of the present application, the drilling rig device 100 further includes a mud pump, which is configured to be connected to the drilling rig body 110 before a stuck pipe phenomenon occurs, so as to pull the target pipe 300 .

[0063] During normal drilling, the drill bit, due to high-speed friction with the sand layer, reaches a high temperature. Furthermore, the drill assembly 120 carries a large amount of mud and sand. Therefore, both cooling the drill bit and removing the mud and sand are necessary. Mud pumps can deliver flushing fluids such as mud or water into the borehole with high efficiency. Therefore, at the beginning of drilling, before the drill becomes stuck, a mud pump is typically connected to the drill rig 110 to pull the target pipe 300.

[0064] like Figure 1 As shown, in some implementations of the present invention, the drilling tool assembly 120 includes a plurality of drill rods 121, a reamer 122, and a hauling head 124 connected in sequence. The drill rods 121 are connected to the drilling rig body 110, and the hauling head 124 is connected to the target pipe 300.

[0065] When the distance between the drilling rig body 110 and the target pipe 300 is far, the distance requirement can be met by increasing the number of drill rods 121 , wherein the multiple drill rods 121 can be connected by threads.

[0066] The diameter of the reamer 122 is larger than the diameter of the drill rod 121 and the target pipe 300, and plays the role of expanding the hole diameter and trimming the hole wall. Under the drag of the drill rod 121, the reamer 122 can ensure that the hole diameter will not be reduced, thereby facilitating the movement of the target pipe 300 in the hole.

[0067] In some embodiments of the present application, the drill tool assembly 120 may further include a universal joint 123, one end of which is connected to the hauling head 124 and the other end to the reamer 122. When the drill rig body 110 is hauling the target pipe 300, the drill rod 121 and reamer 122 are typically rotated to reduce drag. However, the target pipe 300 cannot rotate, so a universal joint 123 is provided between the hauling head 124 and the reamer 122. The two ends of the universal joint 123 can rotate at different speeds, thus satisfying the connection requirements between the hauling head 124 and the reamer 122.

[0068] In summary, the directional drilling system provided in the embodiment of the present application can, under normal use, drive the drilling rig body 110 to drag the target pipeline 300 through the mud pump. When the detection instrument detects that the torque of the drilling rig body 110 is greater than the set threshold, it can be determined that the drill tool assembly 120 is locked by sand and soil, and a drill sticking phenomenon occurs. At this time, the mud pump can be disconnected from the drilling rig body 110, and the air compressor 210 can be installed on the drilling rig body 110, and compressed air can be delivered to the drilling rig body 110, so that the pressure in the drill tool assembly 120 is greater than the external pressure. Since compressed air has the characteristics of expansion and buoyancy, it can flush away the sand and soil that is locking the drill tool assembly 120, so that the drill tool assembly 120 is unstuck, thereby ensuring the smooth towing back of the submarine pipeline.

[0069] The present application also provides a method for unblocking a jam, which can be implemented by the above-mentioned offshore directional drilling system. Figure 2 As shown, the card unlocking method provided in the embodiment of the present application includes the following steps:

[0070] Step 201: When a drill is stuck, connect the drill body to a jam release device.

[0071] Step 202: Start the jam-releasing device to deliver the jam-releasing medium into the drill assembly.

[0072] Step 203: When it is detected that a jam-releasing medium is present at the position where the drill tool assembly is locked, the drilling rig body is started.

[0073] The unstuck method provided in the embodiment of the present application is applicable to situations where a drill assembly is stuck. By connecting the unstuck device to the drilling rig body and then delivering a unstuck medium into the drill assembly, the pressure inside the drill assembly is made greater than the external pressure. In this way, the sand originally buried in the drill assembly can be flushed away by the high-pressure unstuck medium, thereby releasing the drill assembly, allowing the drill assembly to be unstuck and resume normal rotation, thereby ensuring the smooth towing back of the submarine pipeline.

[0074] The present invention also provides another method for unblocking a jammed pipe, which can be implemented using a marine directional drilling system. In this system, a drilling rig 110 is mounted on a barge 400, which is anchored to the sea surface via an anchor cable 410. A mud pump is connected to the drilling rig 110 to provide driving force. The drilling rig 110, multiple drill pipes 121, a reamer 122, a universal joint 123, and a hauling head 124 are sequentially connected. The end of the hauling head 124, distal from the universal joint 123, is connected to the target pipeline 300.

[0075] like Figure 3 As shown, the card unlocking method may include steps 301 to 309.

[0076] Step 301: The drilling rig body drags the target pipeline under the drive of the mud pump.

[0077] Under normal conditions, when the drill rig 110 is not stuck, the mud pump can pull the target pipeline 300 toward the target location. The drill rig 110 (barge 400) and the target pipeline 300 are connected by multiple drill rods 121. As the pullback operation progresses, the distance between the drill rig 110 (barge 400) and the target pipeline 300 decreases, and the number of drill rods 121 connecting the two decreases.

[0078] For example, before dragging the target pipeline 300, the drilling rig body 110 and the target pipeline 300 may be connected via 15 drill rods 121. The power is turned on, the mud pump and the drilling rig body 110 are started, and the drilling rig body 110 drags the drill rods 121 forward to expand the hole and simultaneously drag the target pipeline 300 forward. When the stroke of a drill rod 121 is completed, the mud pump is turned off, and the pressure relief valve is opened to begin pressure relief. After the pressure in the drill rod 121 reaches atmospheric pressure, the pressure relief valve is closed, and the drill rod 121 is removed. At this point, the drilling rig body 110 and the target pipeline 300 are connected via 14 drill rods 121. Similarly, the mud pump drives the drilling rig body 110 to drag the target pipeline 300 to the target location.

[0079] Step 302: Obtain the torque of the drill body. When the torque is greater than a set threshold, it is determined that a drill sticking phenomenon occurs.

[0080] As the drill body 110 rotates the drill rod 121, the reamer 122 is most susceptible to soil and earth blocking due to its largest diameter. A test instrument is used to monitor the torque of the drill body 110. If the test instrument detects that the torque of the drill body 110 is greater than a set threshold and the reamer 122 still cannot rotate, it can be determined that the reamer 122 is blocked by soil and a drill sticking phenomenon has occurred.

[0081] In some embodiments of the present application, the drilling rig apparatus 100 may further include a controller and an alarm. The controller may be electrically connected to the alarm and the detection instrument. The controller may obtain and analyze the torque of the drilling rig body 110 detected by the detection instrument, and analyze the torque. When the controller determines that the torque of the drilling rig body 110 is greater than a set threshold, the controller may send an alarm signal to the alarm. Upon receiving the alarm signal, the alarm may emit an audible / visual alarm signal to alert the operator that the torque of the drilling rig body 110 is excessive and a drill sticking phenomenon may occur. This avoids the operator failing to promptly notice the excessive torque displayed by the detection instrument and thus preventing engineering accidents.

[0082] Step 303: Stop the mud pump and the drilling rig body, and disconnect the mud pump from the drilling rig body.

[0083] If a drill gets stuck during the operation of the mud pump, it means that the mud or other flushing fluid delivered by the mud pump is not enough to flush away all the sand and soil on the reamer 122, and cannot effectively release the stuck state of the reamer 122. In this case, the mud pump can be removed from the drilling rig body 110 and replaced with a device with stronger jamming capability to release the jam.

[0084] Step 304: Connect the drilling rig body to the jam release device.

[0085] In this embodiment of the present application, jam release device 200 may be an air compressor 210, and accordingly, the jam release medium is compressed air. Air compressor 210 can pump compressed air into drill assembly 120, increasing the air pressure within drill assembly 120 to be greater than the external pressure. Compared to pumping a liquid medium, compressed air gradually expands in water, and since the density of air is much lower than that of seawater and sand, it naturally rises in seawater, thereby increasing the effective travel distance of the air, making it easier to dissipate sand and greatly improving the success rate of jam release.

[0086] The air compressor 210 and the drilling rig body 110 are connected via a hose 220 , and the compressed air is delivered to the drill rod 121 and the reamer 122 via the hose 220 .

[0087] Step 305: Start the jam-releasing device to deliver the jam-releasing medium into the drilling tool assembly.

[0088] The air compressor 210 is started to deliver compressed air to the drill pipe 121 and the reamer 122. After a stuck drill pipe occurs, the drill assembly 120 is typically a sealed environment. Therefore, delivering compressed air to the drill assembly 120 increases the pressure inside the drill assembly 120 to be greater than the external pressure. Under the action of this pressure, the sand and soil that is stuck to the reamer 122 is dislodged by the compressed air, releasing the reamer 122 and unblocking it, thereby ensuring smooth retraction of the submarine pipeline.

[0089] Step 306: When it is detected that a jam-releasing medium is present at the position where the drill assembly is locked, the drilling rig body is started.

[0090] In some implementations of the embodiments of the present application, detecting the presence of a release medium at the location where the drill assembly is stuck in step 306 may include the following steps:

[0091] Step 3061: Observe the sand layer where the reamer is located;

[0092] Step 3062: When bubbles are observed overflowing from the sand layer where the reamer is located, it is determined that a de-jamming medium is present at the location where the drill assembly is stuck.

[0093] After the reamer 122 is unstuck, compressed air will overflow from the location of the reamer 122, allowing observation of the sand layer or the sea surface above the sand layer. Bubbles escaping from the sand layer will float to the sea surface, making it easier to observe the sea surface. When bubbles appear on the sea surface corresponding to the location of the reamer 122, it indicates that the reamer 122 has been unstuck. The drilling rig body 110 can then be activated to rotate the drill rod 121 and reamer 122. If the reamer 122 can fully rotate, the drilling rig body 110 can continue to drag the drill rod 121 forward to expand the hole.

[0094] Step 307: After the current drill rod stroke is completed, the jam release device is closed and the pressure relief valve is opened.

[0095] The current drill rod is the drill rod 121 directly connected to the drill rig body 110 among the multiple drill rods 121. During the process of the drill rig body 110 dragging the drill rods 121 forward, the stroke of each drill rod 121 is fixed. After the stroke of the current drill rod ends, the connection between the drill rod 121 and the drill rig body 110 needs to be disconnected and removed.

[0096] However, since a large amount of compressed air is input into the drill rod 121, the pressure inside the drill rod 121 is much greater than the external pressure. If the current drill rod is directly disassembled, it is easy to be dangerous. Therefore, before disassembling the current drill rod, it is necessary to first turn off the air compressor 210 to stop supplying compressed air, and then open the pressure relief valve to release the pressure.

[0097] Step 308: When it is detected that the pressure in the current drill pipe is consistent with the atmospheric pressure, the pressure relief valve is closed and the current drill pipe is disassembled.

[0098] In the embodiment of the present application, a pressure gauge can be used to detect the pressure in the drill rod 121. When the pressure gauge detects that the pressure in the drill rod 121 is consistent with the atmospheric pressure, the pressure relief is completed. At this time, the pressure relief valve can be closed and the current drill rod can be removed.

[0099] Step 309: Connect the drilling rig body to the target drill pipe.

[0100] After the current drill rod is disassembled, the drill rig body 110 can be connected to the target drill rod, thereby continuing to drag the drill rod 121 and the target pipe 300 forward. The target drill rod is the drill rod 121 that is directly connected to the current drill rod among the multiple drill rods 121. For example, starting from the side where the reamer 122 is located, there are a total of 15 drill rods 121 connected in sequence, of which the 15th drill rod 121 is directly connected to the drill rig body 110, then the 15th drill rod 121 is the current drill rod. The 14th drill rod 121 that is directly connected to the 15th drill rod 121 is the target drill rod. After the 15th drill rod 121 is disassembled, the 14th drill rod 121 is directly connected to the drill rig body 110, then at this time the 14th drill rod 121 is the current drill rod, and the 13th drill rod 121 is the target drill rod. Each time a drill rod 121 is removed, it means that the reamer 122 has moved a distance, and the target pipe 300 has also been dragged a distance by the drilling rig body 110. By analogy, until the reaming is completed, the drilling rig body 110 drags the target pipe 300 to the target position.

[0101] In summary, the embodiments of the present application provide a method for unstuck drills based on the expansion and buoyancy characteristics of compressed air, combined with ocean hydrological conditions. By acquiring the torque of the drill rig body 110, a stuck drill can be detected promptly. The air compressor 210 is then connected to the drill rig body 110 and compressed air is delivered to the drill assembly 120, raising the pressure within the drill assembly 120 to a value greater than the external pressure. When bubbles overflow from the sand layer where the reamer 122 is located, this indicates that compressed air has escaped from the reamer 122 and effectively released the sand from locking the reamer 122. Therefore, the drill rig body 110 can be activated to rotate the reamer 122, and after the reamer 122 is fully rotated, the drill rod 121 can continue to be dragged forward to ream the hole. This shows that the unstuck method provided by the embodiments of the present application effectively solves the problem of stuck drills caused by the drill assembly 120 being easily locked by sand during offshore directional drilling operations, ensuring the smooth retraction of the target pipeline 300.

[0102] The unjamming method provided in the embodiment of the present application fully utilizes the characteristics of compressed gas and seabed, has a simple operation process, is safe and reliable, does not require additional equipment and personnel, has a low construction cost, and can complete the unjamming work quickly and effectively.

[0103] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the present invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only.

[0104] It should be understood that the present application is not limited to the exact structures described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A card unlocking method, characterized in that: The method comprises: When the drilling rig body (110) is driven by a mud pump to pull the target pipe (300), the torque of the drilling rig body (110) is obtained; When it is detected that the torque is greater than a set threshold, it is determined that a drill sticking phenomenon has occurred, the mud pump and the drilling rig body (110) are stopped, and the mud pump is disconnected from the drilling rig body (110); Connecting the drilling rig body (110) to a jam-releasing device (200), wherein the jam-releasing device (200) is an air compressor (210); The jam-releasing device (200) is activated to deliver a jam-releasing medium into the drill assembly (120), wherein the jam-releasing medium is compressed air. The drill assembly (120) includes a plurality of drill rods (121), a reamer (122), and a drag head (124) connected in sequence. The drill rods (121) are connected to the drilling rig body (110), and the drag head (124) is connected to the target pipe (300). Observe the sand layer where the reamer (122) is located; When bubbles are observed to overflow from the sand layer where the reamer (122) is located, it is determined that the jam-releasing medium appears at the position where the drill assembly (120) is locked, and the drilling rig body (110) is started; The method further comprises: After the stroke of the current drill rod (121) is completed, the jamming release device (200) is closed and the pressure relief valve is opened, wherein the current drill rod (121) is a drill rod (121) directly connected to the drilling rig body (110) among the multiple drill rods (121); When it is detected that the pressure in the current drill rod (121) is consistent with the atmospheric pressure, the pressure relief valve is closed and the current drill rod (121) is disassembled; The drilling rig body (110) is connected to a target drill rod (121), wherein the target drill rod (121) is a drill rod (121) among the multiple drill rods (121) that is directly connected to the current drill rod (121).

2. A offshore directional drilling system for executing the jamming release method according to claim 1, characterized in that: The system is applied to a submarine pipeline and comprises a drilling device (100) and a jam-releasing device (200); The drilling rig device (100) includes a drilling rig body (110), a drilling tool assembly (120), a detection instrument (230) and a mud pump, wherein the drilling tool assembly (120) includes a plurality of drill rods (121), a reamer (122) and a drag head (124) connected in sequence, wherein the drill rods (121) are connected to the drilling rig body (110), the drag head (124) is connected to the target pipe (300), and the detection instrument (230) is configured to detect the torque of the drilling rig body (110); the mud pump is configured to be connected to the drilling rig body (110) before a drill sticking phenomenon occurs, thereby dragging the target pipe (300); The unjamming device (200) is configured to be connected to the drill body (110) when the drill stuck phenomenon occurs, and to transport an unjamming medium into the drill assembly (120) so that the pressure inside the drill assembly (120) is greater than the external pressure, wherein the unjamming device (200) includes an air compressor (210), and the unjamming medium is compressed air; when the drill stuck phenomenon occurs, the torque of the drill body (110) is greater than a set threshold.

3. The offshore directional drilling system according to claim 2, characterized in that: The jam-releasing device (200) further comprises a hose (220), one end of the hose (220) being connected to the air compressor (210), and the other end being connected to the drilling rig body (110).

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