Constant bit pressure drilling device, coiled tubing drilling assembly and control method

Abstract

The invention discloses a constant bit pressure drilling device, a coiled tubing drilling assembly and a control method, and relates to the technical field of coiled tubing drilling. The moving end of the driving device is used for being in contact with the drill bit to pressurize or depressurize the drill bit; the bit pressure sensor is arranged close to the drill bit so as to measure the bit pressure at the drill bit in real time; the bit pressure sensor and the driving device are both connected with the bit pressure controller, the bit pressure controller is used for judging whether the actually measured bit pressure is larger than the preset bit pressure or not, if yes, the driving device is controlled to retract, and if not, the driving device is controlled to extend. The device can guarantee the constant drilling pressure at the bottom of a well, so that the drilling and rock breaking efficiency is improved, and the drilling period is shortened.

Description

Technical Field

[0001] The present invention relates to the technical field of coiled tubing drilling, and more specifically to a constant pressure-on-bit drilling device. In addition, the present invention also relates to a coiled tubing drilling assembly including the constant pressure-on-bit drilling device and a control method suitable for the constant pressure-on-bit drilling device. Background Art

[0002] In the relevant technologies, the number of long-stopped wells and low-yield and low-efficiency wells in the middle and late stages of old oilfield development is increasing. Using the original old wells to deploy side drilling has become an important means to tap the potential and increase efficiency of old oilfields. Compared with conventional drilling technology, the continuous tubing drilling technology has high drilling efficiency, and has become an effective engineering technology for side drilling of old wells. Limited by the flexible mechanical characteristics of the continuous tubing drilling string, the weight of the string is supported on the well wall during the construction of high-angle wells. Most of the existing technologies reduce the support pressure by using hydraulic oscillation tools, but there are phenomena such as staged release of drilling pressure during its working process, which makes the drilling pressure of the bottom hole drill bit not constant, resulting in the drill bit being easily damaged in advance and low rock breaking efficiency, affecting the drilling cycle.

[0003] In summary, how to ensure the constant drilling pressure at the bottom of the well, improve the drilling and rock breaking efficiency, and shorten the drilling cycle are problems that need to be urgently solved by technical personnel in this field. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a constant drilling pressure drilling device, which can ensure the constant drilling pressure at the bottom of the well, so as to improve the drilling and rock breaking efficiency and shorten the drilling cycle.

[0005] Another object of the present invention is to provide a coiled tubing drilling assembly including the above-mentioned constant pressure-on-bit drilling device and a control method suitable for the above-mentioned constant pressure-on-bit drilling device.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A constant drilling pressure drilling device, comprising:

[0008] drill;

[0009] a driving device, the moving end of which is used to contact the drill bit to pressurize or depressurize the drill bit;

[0010] A drilling pressure sensor is disposed near the drill bit to measure the drilling pressure at the drill bit in real time;

[0011] A drilling pressure controller, wherein the drilling pressure sensor and the driving device are both connected to the drilling pressure controller, and the drilling pressure controller is used to determine whether the measured drilling pressure is greater than the preset drilling pressure. If so, the driving device is controlled to retract; if not, the driving device is controlled to extend.

[0012] In one embodiment, the driving device includes a transmission mechanism, an elastic mechanism, and a telescopic mechanism connected in sequence, the transmission mechanism is connected to the drilling pressure controller, and the telescopic mechanism is used to contact the drill bit.

[0013] In one embodiment, the drill bit and the telescopic mechanism are connected via a screw drill.

[0014] In one embodiment, it further comprises a cable, wherein the cable is used to supply power to the bit pressure sensor, the driving device and the bit pressure controller.

[0015] A continuous tubing drilling assembly comprises any one of the above-mentioned constant drilling pressure drilling devices.

[0016] In one embodiment, it also includes a drilling instrument system, an electric-controlled directional system, a weighted drill pipe and a continuous pipe connected in sequence, and the drilling instrument system is arranged on the top of the constant drilling pressure drilling device.

[0017] In one embodiment, the coiled tubing, the weighted drill pipe, the electric-controlled directional control system and the drilling instrument system all have a cable threading structure.

[0018] A control method, applied to any of the above-mentioned constant drilling pressure drilling devices, comprising:

[0019] Obtain the measured drilling pressure at the drill bit;

[0020] Determine whether the measured drilling pressure is greater than the preset drilling pressure;

[0021] If so, the driving device is controlled to retract to reduce the pressure applied to the drill bit; if not, the driving device is controlled to extend to increase the pressure applied to the drill bit.

[0022] When using the constant drilling pressure drilling device provided by the present invention, the drilling pressure sensor measures and feeds back the drilling pressure near the drill bit in real time during the drilling process, and the drilling pressure sensor can feed back the measured drilling pressure value to the drilling pressure controller. The drilling pressure controller can determine whether the measured drilling pressure is greater than the preset drilling pressure. If the measured drilling pressure is greater than the preset drilling pressure, the driving device is controlled to operate so that the driving device retracts relative to the drill bit, thereby reducing the pressure applied by the driving device on the drill bit, so that the drilling pressure of the drill bit is reduced to reach the preset drilling pressure. If the measured drilling pressure is less than the preset drilling pressure, the driving device is controlled to operate in the reverse direction so that the driving device extends relative to the drill bit, thereby increasing the pressure applied by the driving device on the drill bit. If the measured drilling pressure is equal to the preset drilling pressure, there is no need to control the driving device to operate.

[0023] Therefore, the device controls the operation of the driving device according to the measured drilling pressure at the drill bit, so as to adjust the drilling pressure at the drill bit in real time, so as to maintain a constant pressure at the drill bit. Ultimately, it can help improve the drilling and rock breaking efficiency of the drill bit and shorten the drilling cycle.

[0024] In summary, the constant drilling pressure drilling device provided by the present invention can ensure the constant drilling pressure at the bottom of the well, thereby improving the drilling and rock breaking efficiency and shortening the drilling cycle.

[0025] In addition, the present invention also provides a coiled tubing drilling assembly including the above-mentioned constant pressure-on-bit drilling device and a control method suitable for the above-mentioned constant pressure-on-bit drilling device. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0027] Figure 1 A schematic diagram of the structure of the constant drilling pressure drilling device provided by the present invention;

[0028] Figure 2 is a schematic diagram of the structure when the driving device is extended;

[0029] Figure 3 It is a schematic diagram of the structure when the driving device is retracted;

[0030] Figure 4 This is a flow chart of the control method provided by the present invention.

[0031] Figure 1-Figure 4 middle:

[0032] 1 is a cable, 2 is a drilling pressure sensor, 3 is a drilling pressure controller, 4 is a transmission mechanism, 5 is an elastic mechanism, 6 is a telescopic mechanism, and 7 is a driving device. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] The core of the present invention is to provide a constant drilling pressure drilling device, which can ensure the constant drilling pressure at the bottom of the well, so as to improve the drilling and rock breaking efficiency and shorten the drilling cycle. Another core of the present invention is to provide a continuous tubing drilling assembly including the above-mentioned constant drilling pressure drilling device and a control method suitable for the above-mentioned constant drilling pressure drilling device.

[0035] Please refer to Figures 1 to 4 , Figure 1 A schematic diagram of the structure of the constant drilling pressure drilling device provided by the present invention; Figure 2 is a schematic diagram of the structure when the driving device is extended; Figure 3 It is a schematic diagram of the structure when the driving device is retracted; Figure 4 This is a flow chart of the control method provided by the present invention.

[0036] This specific embodiment provides a constant drilling pressure drilling device, comprising:

[0037] drill;

[0038] A driving device 7, whose moving end is used to contact the drill bit to pressurize or depressurize the drill bit;

[0039] A drilling pressure sensor 2, which is arranged close to the drill bit to measure the drilling pressure at the drill bit in real time;

[0040] The drilling pressure controller 3, the drilling pressure sensor 2 and the driving device 7 are all connected to the drilling pressure controller 3. The drilling pressure controller 3 is used to determine whether the measured drilling pressure is greater than the preset drilling pressure. If so, the driving device 7 is controlled to retract, if not, the driving device 7 is controlled to extend.

[0041] It should be noted that the device adopts an electronic control method to ensure that the drilling pressure of the bottom hole rock breaking tool is constant, improve the drilling speed, and promote the popularization and application of the coiled tubing drilling technology. In the actual application process, the shape, structure, size, position, type, etc. of the drill bit, the driving device 7, the drilling pressure sensor 2 and the drilling pressure controller 3 can be determined according to the actual situation and actual needs.

[0042] When using the constant drilling pressure drilling device provided by the present invention, the drilling pressure sensor 2 measures and feeds back the drilling pressure near the drill bit in real time during the drilling process, and the drilling pressure sensor 2 can feed back the measured drilling pressure value to the drilling pressure controller 3. The drilling pressure controller 3 can determine whether the measured drilling pressure is greater than the preset drilling pressure. If the measured drilling pressure is greater than the preset drilling pressure, the driving device 7 is controlled to operate so that the driving device 7 retracts relative to the drill bit, thereby reducing the pressure applied by the driving device 7 on the drill bit, so that the drilling pressure of the drill bit is reduced to reach the preset drilling pressure. If the measured drilling pressure is less than the preset drilling pressure, the driving device 7 is controlled to operate in the reverse direction so that the driving device 7 extends relative to the drill bit, thereby increasing the pressure applied by the driving device 7 on the drill bit. If the measured drilling pressure is equal to the preset drilling pressure, there is no need to control the driving device 7 to operate.

[0043] Therefore, the device controls the operation of the driving device 7 according to the measured drilling pressure at the drill bit to adjust the drilling pressure at the drill bit in real time, so that a constant pressure is maintained at the drill bit. Ultimately, it can help improve the drilling and rock breaking efficiency of the drill bit and shorten the drilling cycle.

[0044] In summary, the constant drilling pressure drilling device provided by the present invention can ensure the constant drilling pressure at the bottom of the well, thereby improving the drilling and rock breaking efficiency and shortening the drilling cycle.

[0045] In one embodiment, the driving device 7 includes a transmission mechanism 4, an elastic mechanism 5 and a telescopic mechanism 6 connected in sequence, the transmission mechanism 4 is connected to the drilling pressure controller 3, and the telescopic mechanism 6 is used to contact the drill bit. That is, the actual drilling pressure near the drill bit can be measured by the drilling pressure sensor 2, and the drilling pressure sensor 2 can feed back the drilling pressure information to the drilling pressure controller 3. The drilling pressure controller 3 applies a constant drilling pressure to the drill bit through the coordinated adjustment of the transmission mechanism 4, the elastic mechanism 5 and the telescopic mechanism 6 based on the preset drilling pressure, so as to improve the rock breaking state and working efficiency of the drill bit and ensure the rock breaking effect.

[0046] In one embodiment, the drill bit and the telescopic mechanism 6 are connected via a screw drill, so that the drill bit can be compressed or loosened when the telescopic mechanism 6 is in telescopic operation.

[0047] In one embodiment, a cable 1 is further included, and the cable 1 is used to supply power to the drilling pressure sensor 2, the driving device 7 and the drilling pressure controller 3. That is, the constant drilling pressure drilling device is powered by the cable 1. During the drilling process, the drilling pressure sensor 2 measures the drilling pressure near the drill bit in real time, and the drilling pressure sensor 2 can feed back the measured drilling pressure value to the drilling pressure controller 3.

[0048] If the measured drilling pressure is greater than the preset drilling pressure, the drilling pressure controller 3 starts the command and transmits it to the transmission mechanism 4, and the elastic mechanism 5 contracts to drive the telescopic mechanism 6 to retract, thereby reducing the drilling pressure applied to the drill bit. If the measured drilling pressure is less than the preset drilling pressure, the drilling pressure controller 3 starts the command and transmits it to the transmission mechanism 4, and the elastic mechanism 5 expands to drive the telescopic mechanism 6 to extend, thereby increasing the drilling pressure applied to the drill bit. The use of an electric control structure design can ensure the precise control of the extension and retraction of the telescopic mechanism 6, ensuring that the drilling pressure of the bottom hole drill bit is constant.

[0049] Next, the operation process of the device is described by taking the construction of a well with a depth of 2000m as an example. The preset drilling pressure at the bottom of the well is set to 3t. Figure 1 As shown, the constant drilling pressure drilling device is powered by a cable 1. During the drilling process, a drilling pressure sensor 2 installed on the constant drilling pressure drilling device measures and feeds back the drilling pressure near the drill bit in real time. The measured drilling pressure value can be fed back to a drilling pressure controller 3.

[0050] If the measured drilling pressure value is greater than 3t, the drilling pressure controller 3 starts the instruction and transmits it to the transmission mechanism 4, so that the elastic mechanism 5 contracts and drives the telescopic mechanism 6 to retract, so as to reduce the drilling pressure applied to the drill bit. Figure 3 If the measured drilling pressure value is less than 3t, the drilling pressure controller 3 transmits the start command to the transmission mechanism 4 to expand the elastic mechanism 5 and drive the telescopic mechanism 6 to extend, so as to increase the drilling pressure applied to the drill bit. Figure 2 The electric control structure design can ensure the precise control of the extension and retraction of the telescopic mechanism 6, thereby ensuring the constant drilling pressure of the bottom hole drill bit.

[0051] In addition to the above-mentioned constant drilling pressure drilling device, the present invention also provides a continuous tubing drilling assembly including the constant drilling pressure drilling device disclosed in the above-mentioned embodiment. For the structures of other parts of the continuous tubing drilling assembly, please refer to the prior art and will not be repeated herein.

[0052] In one embodiment, it also includes a drilling instrument system, an electric-controlled directional system, a weighted drill pipe and a continuous pipe connected in sequence, and the drilling instrument system is arranged on the top of the constant drilling pressure drilling device.

[0053] In one embodiment, the coiled tubing, weighted drill pipe, electric-controlled directional system and instrument system while drilling all have a cable threading structure. During the on-site construction, the constant drilling pressure drilling device is placed above the screw, and the drill tool assembly is: drill bit + screw drill + constant drilling pressure drilling device + instrument system while drilling + electric-controlled directional system + weighted drill pipe + coiled tubing; among them, the coiled tubing, weighted drill pipe, electric-controlled directional system and instrument system while drilling all have a cable threading structure to ensure smooth and stable power supply to the constant drilling pressure drilling device.

[0054] In addition to the above-mentioned constant drilling pressure drilling device, the present invention also provides a control method for the constant drilling pressure drilling device disclosed in the above-mentioned embodiment, the control method comprising:

[0055] S1. Obtain the measured drilling pressure at the drill bit;

[0056] S2. Determine whether the measured drilling pressure is greater than the preset drilling pressure; if so, control the driving device 7 to retract to reduce the pressure applied to the drill bit; if not, control the driving device 7 to extend to increase the pressure applied to the drill bit.

[0057] That is, during the on-site construction process, the drilling pressure sensor 2 measures and feeds back the drilling pressure near the drill bit in real time to the drilling pressure controller 3. If the measured drilling pressure is greater than the preset drilling pressure, the drilling pressure controller 3 starts the command and transmits it to the transmission mechanism 4, so that the elastic mechanism 5 contracts and drives the telescopic mechanism 6 to retract, so as to reduce the drilling pressure applied to the drill bit. If the measured drilling pressure is less than the preset drilling pressure, the drilling pressure controller 3 starts the command and transmits it to the transmission mechanism 4, so that the elastic mechanism 5 expands and drives the telescopic mechanism 6 to extend, so as to increase the drilling pressure applied to the drill bit, so as to realize the constant pressure drilling operation of the drill bit.

[0058] In addition, it should be noted that the orientation or positional relationship indicated by "up and down", "top and bottom", etc. in the present invention is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of simplifying the description and facilitating understanding, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0059] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. Any combination of all embodiments provided by the present invention is within the protection scope of this invention and will not be described in detail here.

[0060] The above is a detailed introduction to the constant drilling pressure drilling device, continuous pipe drilling assembly and control method provided by the present invention. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, the present invention can also be improved and modified in a number of ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A constant drilling pressure drilling device, It is characterized in that include: drill; A driving device (7), the moving end of which is used to contact the drill bit to pressurize or depressurize the drill bit; A drilling pressure sensor (2) is arranged close to the drill bit to measure the drilling pressure at the drill bit in real time; A drilling pressure controller (3), the drilling pressure sensor (2) and the driving device (7) are both connected to the drilling pressure controller (3), and the drilling pressure controller (3) is used to determine whether the measured drilling pressure is greater than the preset drilling pressure, and if so, control the driving device (7) to retract, and if not, control the driving device (7) to extend.

2. The constant drilling pressure drilling device according to claim 1, It is characterized in that The driving device (7) comprises a transmission mechanism (4), an elastic mechanism (5) and a telescopic mechanism (6) which are connected in sequence; the transmission mechanism (4) is connected to the drilling pressure controller (3); and the telescopic mechanism (6) is used to contact the drill bit.

3. The constant drilling pressure drilling device according to claim 2, It is characterized in that The drill bit and the telescopic mechanism (6) are connected via a screw drill.

4. The constant drilling pressure drilling device according to any one of claims 1 to 3, It is characterized in that It also comprises a cable (1), wherein the cable (1) is used to supply power to the drilling pressure sensor (2), the driving device (7) and the drilling pressure controller (3).

5. A coiled tubing drilling assembly, It is characterized in that A constant drilling pressure drilling device comprising any one of claims 1 to 4 above.

6. The coiled tubing drilling assembly according to claim 5, It is characterized in that It also includes a drilling instrument system, an electric-controlled directional system, a weighted drill pipe and a continuous pipe connected in sequence. The drilling instrument system is arranged on the top of the constant drilling pressure drilling device.

7. The coiled tubing drilling assembly according to claim 6, It is characterized in that The coiled tubing, the weighted drill pipe, the electrically controlled directional system and the drilling instrument system all have a cable threading structure.

8. A control method, applied to the constant drilling pressure drilling device according to any one of claims 1 to 4 above, It is characterized in that include: Obtain the measured drilling pressure at the drill bit; Determine whether the measured drilling pressure is greater than the preset drilling pressure; If yes, the driving device (7) is controlled to retract to reduce the pressure applied to the drill bit; if no, the driving device (7) is controlled to extend to increase the pressure applied to the drill bit.

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