Well drilling casing pipe and high-voltage cable integrated structure and well drilling method

Abstract

The invention relates to the field of well drilling, in particular to a well drilling casing and high-voltage cable integrated structure and further relates to a well drilling method.The outer wall of a casing is provided with a plurality of arc-shaped plates distributed in the circumferential direction of the casing, and a first channel arranged in the axial direction of the casing is formed between each arc-shaped plate and the outer wall of the casing; an internal pipeline of the sleeve is a second channel; wing plates used for being connected with a sleeve are arranged on the two sides of the arc-shaped plate, and a wire groove used for containing a high-voltage cable is formed by every two adjacent wing plates. A convex edge is arranged at the joint of the arc-shaped plate and the wing plate; the protruding edge protrudes towards the inner side of the wire groove. According to the invention, the drill bit directly drives the casing pipe to enter the underground, and the casing pipe is left in the underground to form a well wall, so that the drilling process steps are obviously simplified, and strong current is provided for underground electric equipment through the high-voltage cable placed in the wire slot.

Description

Technical Field

[0001] This invention relates to the field of drilling, specifically to an integrated structure of drilling casing and high-voltage cable, and also to a drilling method. Background Technology

[0002] The current drilling method involves using a drill bit carrying a drill pipe to drill a hole on the surface. After drilling to the designated location, the drill pipe needs to be removed from the well, and then a casing is placed downhole to remain and form the well wall. Various problems arise when placing the casing in the drilled well, and the drill pipe needs to be disassembled after removal, which is time-consuming and labor-intensive. Furthermore, it can currently only supply signal power (low-voltage electricity) to downhole equipment, preventing high-power equipment from operating normally. Summary of the Invention

[0003] The first objective of this invention is to provide an integrated structure for drilling casing and high-voltage cable, which solves the current problem of being unable to deliver high-power electricity to downhole equipment.

[0004] To achieve the above objectives, the technical solution adopted by this invention is as follows: An integrated structure for drilling casing and high-voltage cable is provided, wherein multiple arc-shaped plates are provided on the outer wall of the casing and distributed along the circumference of the casing. Each arc-shaped plate forms a first channel with the outer wall of the casing and is arranged along the axial direction of the casing. The internal pipe of the casing is a second channel. Wing plates for connecting the casing are provided on both sides of the arc-shaped plate, and adjacent two wing plates form a groove for placing the high-voltage cable.

[0005] Furthermore, there are three arc-shaped plates, which are evenly distributed along the circumference of the sleeve.

[0006] Furthermore, a raised edge is provided at the connection between the arc-shaped plate and the wing plate, and the raised edge protrudes into the inside of the groove.

[0007] Furthermore, one end of the sleeve is provided with a male connector and the other end is provided with a female connector; the male connector has external threads and the female connector has internal threads.

[0008] Another objective of this invention is to provide a drilling method that effectively simplifies the drilling process and significantly improves drilling efficiency.

[0009] To achieve the above objectives, the technical solution adopted by this invention is as follows: A drilling method using an integrated structure of drilling casing and high-voltage cable as described in the above embodiments, comprising: S1. Connect the drill bit to the first casing at the bottom. The high-voltage cable laid on the casing can supply power to the electrical equipment downhole. The drill bit drives the casing to carry out drilling operations. S2. After the first sleeve is drilled to the specified position, a second sleeve needs to be installed above the first sleeve. The second sleeve is threaded to the first sleeve. When the first sleeve and the second sleeve are firmly connected, the groove on the first sleeve is aligned with the groove on the second sleeve. The high-voltage cable is then laid along the groove of the second sleeve. S3. Repeat steps S2 until the Nth casing is installed and reaches the specified drilling depth. Then, remove the drill bit along the second channel and place the casing in the well to form the well wall. N is a positive integer.

[0010] Furthermore, the male connector of the second sleeve is threadedly connected to the female connector of the first sleeve.

[0011] Furthermore, the first channel is an output channel, and the second channel is an input channel.

[0012] Furthermore, the drill bit is connected to a drilling motor, the drilling motor is connected to a retrieval pump, and the retrieval pump is connected to the casing.

[0013] Furthermore, the drill bit is a telescopic drill bit.

[0014] Compared with the prior art, the present invention has the following advantages and beneficial effects: 1. This invention allows the drill bit to directly drive the sleeve for drilling operations. After drilling to the designated position, the drill bit is removed through the second channel of the sleeve, while the sleeve remains downhole to form the well wall, which significantly simplifies the drilling process.

[0015] 2. The present invention has a groove on the sleeve for placing high-voltage cables, so as to improve the power supply for underground electrical equipment and enable the high-power electrical equipment in the well to operate efficiently. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a drilling casing.

[0017] Figure 2 This is a top view of a drilling casing.

[0018] Figure 3 For along Figure 2 Sectional view at point AA.

[0019] Figure 4 This is a schematic diagram of the connection between the wing plate and the tube body.

[0020] Figure 5 This is a schematic diagram of a drilling device. Detailed Implementation

[0021] Example 1 An integrated structure for drilling casing and high-voltage cable is disclosed. Three arc-shaped plates 2 are evenly distributed circumferentially on the outer wall of the casing 1. Each arc-shaped plate 2 forms a first channel 3 along the axial direction of the casing 1 with the outer wall of the casing 1, and the internal conduit of the casing 1 is a second channel 4. Flanges 5 for connecting the casing are provided on both sides of the arc-shaped plates 2. A groove 6 is formed by two adjacent flanges 5 and a protruding edge located at the connection between the arc-shaped plates 2 and the flanges 5. The first channel 3 serves as an output channel, and the second channel 4 serves as an input channel. The drill bit directly drives the casing 1 for drilling operations, and after drilling to the required depth, the casing 1 is left downhole as part of the well wall. The groove 6 is formed by two adjacent flanges 5 and a protruding edge 7 located at the connection between the arc-shaped plates 2 and the flanges 5; the protruding edge 7 protrudes inward into the groove 6. The high-voltage cable is placed in the groove 6, and the protruding edge confines the high-voltage cable within the groove 6 to prevent it from falling out.

[0022] One end of the sleeve 1 is provided with a male connector and the other end is provided with a female connector; the male connector has external threads and the female connector has internal threads. Two adjacent sleeves 1 are threadedly connected, with the male connector of one sleeve 1 threadedly connected to the female connector of the other sleeve 1. When the threaded connection is secure, the grooves 6 of the two sleeves 1 are aligned.

[0023] Example 2 A drilling method using an integrated structure of drilling casing and high-voltage cable as described in the above embodiments, comprising: S1. Connect the drill bit to the first casing at the bottom. The high-voltage cable laid on the casing can supply power to the electrical equipment downhole. The drill bit drives the casing to carry out drilling operations. S2. After the first sleeve is drilled to the specified position, a second sleeve needs to be installed above the first sleeve. The second sleeve is threaded onto the first sleeve. When the first sleeve and the second sleeve are firmly connected, the groove on the first sleeve is aligned with the groove on the second sleeve. The high-voltage cable is then laid along the groove of the second sleeve. The male connector of the second sleeve is threaded onto the female connector of the first sleeve.

[0024] S3. Repeat steps S2 until the Nth casing is installed and reaches the specified drilling depth. Then, remove the drill bit along the second channel and place the casing in the well to form the well wall. N is a positive integer.

[0025] The first channel is the output channel, and the second channel is the input channel. During the drilling process, drilling fluid and other media are transported through the second channel, while shredded rock cuttings and other materials are transported through the first channel.

[0026] The drill bit 13 is connected to a drilling motor 12, which in turn is connected to a retrieval pump 11, which is connected to the casing 1. The drill bit 13 is a telescopic drill bit. The retrieval pump 11 is located on the bottom end of the casing and is connected to the drilling motor 12, which in turn is connected to the telescopic drill bit 13. When the telescopic drill bit 13 is in the retracted state, its cross-sectional area is smaller than that of the retrieval pump 11. The retrieval pump 11 is connected to the inside of the casing. When the drilling motor 12 needs maintenance or retrieval, it can pass through the channel in the middle of the retrieval pump 11 to retrieve it for maintenance or retrieval. During drilling, the telescopic drill bit 13 is in the extended state, with its cross-sectional area larger than that of the casing. The telescopic drill bit 13 drives the casing to perform drilling operations.

[0027] Of course, the above description is not intended to limit the present invention, and the present invention 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 invention should also fall within the protection scope of the present invention.

Claims

1. An integrated structure for drilling casing and high-voltage cable, characterized in that, The outer wall of the bushing is provided with a plurality of arc-shaped plates distributed along the circumference of the bushing. Each arc-shaped plate forms a first channel along the axial direction of the bushing with the outer wall of the bushing, and the internal pipe of the bushing is a second channel. The two sides of the arc-shaped plate are provided with wing plates for connecting the bushing, and adjacent wing plates form a groove for placing high-voltage cables.

2. The integrated structure of drilling casing and high-voltage cable according to claim 1, characterized in that, There are three arc-shaped plates, which are evenly distributed along the circumference of the sleeve.

3. The integrated structure of drilling casing and high-voltage cable according to claim 2, characterized in that, A raised edge is provided at the connection between the arc-shaped plate and the wing plate, and the raised edge protrudes into the inside of the groove.

4. The integrated structure of drilling casing and high-voltage cable according to claim 1, characterized in that, One end of the sleeve is provided with a male connector and the other end is provided with a female connector; the male connector has external threads and the female connector has internal threads.

5. A drilling method, characterized in that, Using an integrated structure for drilling casing and high-voltage cable as described in any one of claims 1 to 4, comprising: S1. Connect the drill bit to the first casing at the bottom. The high-voltage cable laid on the casing can supply power to the electrical equipment downhole. The drill bit drives the casing to carry out drilling operations. S2. After the first sleeve is drilled to the designated position, a second sleeve needs to be installed above the first sleeve. The second sleeve is threaded onto the first sleeve. When the first sleeve and the second sleeve are firmly connected, the groove on the first sleeve is aligned with the groove on the second sleeve. The high-voltage cable is then laid along the groove of the second sleeve. S3. Repeat steps S2 until the Nth casing is installed and reaches the specified drilling depth. Then, remove the drill bit along the second channel and place the casing in the well to form the well wall. N is a positive integer.

6. A drilling method according to claim 5, characterized in that, The male connector of the second sleeve is threadedly connected to the female connector of the first sleeve.

7. A drilling method according to claim 5, characterized in that, The first channel is an output channel, and the second channel is an input channel.

8. A drilling method according to claim 5, characterized in that, The drill bit is connected to a drilling motor, the drilling motor is connected to a retrieval pump, and the retrieval pump is connected to the casing.

9. A drilling method according to claim 5, characterized in that, The drill bit is a telescopic drill bit.

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