Super-large-diameter, super-large-flow and super-power screw drill for super-large borehole

Abstract

The utility model relates to the technical field of drill bits, in particular to an ultra-large-diameter, ultra-large-flow and ultra-high-power screw drill for an ultra-large borehole, which comprises a replacement and protection integrated assembly, an ultra-large-outer-diameter motor assembly, a universal shaft assembly and a transmission shaft assembly which are connected in sequence, the replacing and preventing integrated assembly comprises a replacing and preventing integrated connector, a hollow anti-falling nut, an alloy water nozzle, a pressing ring, an anti-falling gasket and a hollow anti-falling rod, the replacing and preventing integrated connector is used for being connected with other tools, the anti-falling gasket is fixed to the hollow anti-falling rod through the hollow anti-falling nut, and the needed alloy water nozzle is fixed into the hollow anti-falling nut through the pressing ring. And the anti-falling gasket is meshed and fixed with the hollow anti-falling rod in a single flat manner. According to the device, a simple mechanical structure is adopted, so that the screw drill has larger displacement and higher output power; and the ultra-large outer diameter has higher safety and high rock breaking efficiency when being used for drilling in a well hole with the diameter of more than 20 ''.

Description

Technical Field

[0001] The utility model relates to the technical field of drill bits, in particular to a super-large diameter, super-large flow and super-large power screw drill tool for super-large wells. Background Art

[0002] Screw drill bits are the most commonly used downhole power tools in oil drilling. In the process of wellbore construction above 20", the existing φ244 / φ286 screws have drilling displacement parameter limitations, resulting in the inability of existing screw drill bits to provide sufficient drilling power during drilling. It is often difficult to pump and return cuttings during drilling. Utility Model Content

[0003] In order to effectively solve the problems in the above-mentioned background technology, the utility model proposes a super-large diameter, super-large flow and super-large power screw drilling tool for super-large wellbore.

[0004] The specific technical solutions are as follows:

[0005] A super-large diameter, super-large flow and super-high power screw drilling tool for super-large wellbore, comprising a generator and defense integrated assembly, a super-large outer diameter motor assembly, a universal shaft assembly and a transmission shaft assembly connected in sequence;

[0006] The integrated anti-drop assembly includes an integrated anti-drop joint, a hollow anti-drop nut, an alloy water nozzle, a pressure ring, an anti-drop gasket and a hollow anti-drop rod. The integrated anti-drop joint is used to connect with other tools. The hollow anti-drop nut fixes the anti-drop gasket on the hollow anti-drop rod, and the required alloy water nozzle is fixed in the hollow anti-drop nut using the pressure ring. The anti-drop gasket is engaged and fixed with the hollow anti-drop rod in a single flat manner. In order to establish a circulation when the anti-drop function takes effect, the anti-drop gasket adopts an open-hole gasket to prevent the inner annulus from being blocked. In order to improve the connection strength between the anti-drop connecting rod and the rotor and to offset the centrifugal force of the eccentric moving parts, the anti-drop connecting rod is designed as a new structure with threaded ends straightened

[0007] The extra-large outer diameter motor assembly includes a 305mm outer diameter stator and a hollow rotor. The 305mm outer diameter stator is made of a 305mm stator shell inlaid with rubber to cooperate with the hollow rotor. Under the premise of ensuring strength, the rotor is designed with an extra-large hollow to reduce the rotor mass, reduce the centrifugal force during the eccentric movement of the rotor, and reduce the internal friction between the stator and the rotor. A plug is designed on the upper end of the rotor and is welded to the rotor thread. The internal thread connecting the plug and the anti-drop connecting rod is designed with double stops to straighten the anti-drop rod, and is designed to increase the torque on the outer circle to facilitate the torque on the anti-drop rod.

[0008] The cardan shaft assembly includes a cardan shaft housing and a ball-column transmission cardan shaft. The cardan shaft housing connects the transmission shaft assembly and the motor assembly and provides a cavity for the ball-column transmission cardan shaft. The ball-column transmission cardan shaft is a universal mechanism with ball-column hinges at both ends, which converts the planetary motion of the motor assembly rotor into fixed-axis motion and transmits it to the transmission shaft of the transmission assembly.

[0009] The transmission shaft assembly includes a water cap, an upper TC bearing moving ring, an upper TC bearing stationary ring, a multi-row angular contact thrust ball bearing, a pressure sleeve, a half ring, a spacer, a transmission shaft housing, a lower TC bearing stationary ring, a lower TC bearing moving ring and a transmission shaft. The water cap connects the ball-column transmission universal shaft and the transmission shaft, transmits the motion transmitted by the universal shaft to the transmission shaft, and guides the drilling fluid from the inner cavity of the universal shaft housing to the inner hole of the transmission shaft through the water hole. The upper TC bearing moving ring, the upper TC bearing stationary ring, the lower TC bearing stationary ring and the lower TC bearing moving ring constitute a radial straightening system of the transmission shaft assembly, providing radial straightening for the rotation of the transmission shaft; the multi-row angular contact thrust ball bearing provides an axial positioning for the transmission shaft, and transmits the drilling pressure borne by the transmission shaft to the outer housing of the screw drilling tool.

[0010] Preferably, the hollow rotor is made of low-carbon alloy steel, and a profiled surface matching the stator is machined therefrom, and then the surface is chrome plated or sprayed with a tungsten carbide hardening surface coating.

[0011] Preferably, both ends of the hollow rotor are provided with stoppers.

[0012] Preferably, the anti-drop gasket is a perforated gasket.

[0013] In order to facilitate the replacement of the lower TC bearing moving ring, two O-ring seals are designed on the end face and inner hole of the lower TC bearing moving ring.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] The device adopts a simple mechanical structure, which makes the screw drill have a larger displacement and a greater output power; it has higher safety and high rock breaking efficiency when drilling in wells with an ultra-large outer diameter of more than 20". BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 : A schematic diagram of the structure of the utility model;

[0017] Figure 2 : Schematic diagram of the integrated assembly structure of the utility model;

[0018] Figure 3 : Schematic diagram of the anti-dropping liquid flow;

[0019] Figure 4 : Partial schematic diagram of the anti-drop connecting rod thread double-righting structure;

[0020] Figure 5 : Schematic diagram of the super-large outer diameter motor assembly of the utility model;

[0021] Figure 6 : A schematic diagram of the rotor in the super-large outer diameter motor of the utility model;

[0022] Figure 7 : Schematic diagram of the universal shaft assembly of the utility model;

[0023] Figure 8 : Schematic diagram of the transmission shaft assembly of the utility model;

[0024] Fig. 9 : Schematic diagram of the two-way sealing structure of the upper TC bearing moving ring of the utility model. DETAILED DESCRIPTION

[0025] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways, rotated 90 degrees or in other orientations, and the spatially relative descriptions used herein are interpreted accordingly.

[0026] The specific implementation of the utility model is described in detail below with reference to the accompanying drawings and preferred embodiments.

[0027] like Figure 1 As shown, a super-large diameter, super-large flow and super-high power screw drilling tool for super-large wellbore includes an integrated drilling and defense assembly 1, an super-large outer diameter motor assembly 2, a universal shaft assembly 3 and a transmission shaft assembly 4.

[0028] like Figure 2-Figure 4As shown, the anti-drop integrated assembly includes an anti-drop integrated joint 11, a hollow anti-drop nut 12, an alloy water nozzle 13, a pressure ring 14, an anti-drop gasket 15 and a hollow anti-drop rod 16. The main function of the integrated anti-drop joint is to convert the internal thread of the screw drill into a standard API thread, which is convenient for connection with other tools and provides a hanging shoulder for the anti-drop function; the main function of the hollow anti-drop nut is to fix the anti-drop gasket on the hollow anti-drop rod, and use a pressure ring to fix the required alloy water nozzle in the hollow anti-drop nut as needed to meet the needs of larger displacement work; the main function of the anti-drop gasket is to hang on the shoulder of the integrated anti-drop joint in the event of a shell break and inverted buckle failure of the screw drill, and the anti-drop gasket is engaged and fixed with the hollow anti-drop rod in a single flat manner. When the anti-drop function is effective, the phenomenon of rotation and inverted buckle of the release nut can be avoided; the main function of the hollow anti-drop rod is to connect the motor assembly rotor with the anti-drop gasket and the release nut, and play the role of an anti-drop pull rod. Since the anti-drop rod follows the rotor to perform planetary motion, a longer stop is added to the anti-drop rod and the rotor thread to straighten it, thereby improving the connection strength between the anti-drop rod and the rotor.

[0029] like Figure 5 and Figure 6 As shown, the super-large outer diameter motor assembly mainly includes a 305mm outer diameter stator 21 and a hollow rotor 22. The 305mm outer diameter stator is made of a 305mm stator housing inlaid with rubber, and its main function is to convert the pressure energy of the drilling fluid into mechanical energy of rotation by cooperating with the hollow rotor; the hollow rotor is made of low-carbon alloy steel to have a special-shaped surface that matches the stator, and then the surface is chrome-plated or sprayed with a hardened surface coating such as tungsten carbide to improve the surface roughness of the rotor surface and enhance the erosion and corrosion resistance. In order to better connect with the hollow anti-drop rod, stoppers 23 are added on both sides of the thread, and a structure that facilitates the torque on the anti-drop rod is added. On the basis of ensuring strength, the rotor is processed into a hollow rotor, which greatly reduces the mass of the rotor, reduces the energy required for the rotor to perform planetary motion, and improves the output efficiency of the motor assembly.

[0030] like Figure 7 As shown, the cardan shaft assembly 3 mainly includes: a cardan shaft housing 31 and a ball-column transmission cardan shaft 32. The cardan shaft housing has the main function of connecting the transmission shaft assembly and the motor assembly, and providing a cavity for the ball-column transmission cardan shaft; the ball-column transmission cardan shaft is a universal mechanism with ball-column hinges at both ends, and its main function is to convert the planetary motion of the motor assembly rotor into a fixed axis motion and transmit it to the transmission shaft of the transmission assembly.

[0031] like Figure 8 and Fig. 9As shown, the transmission shaft assembly 4 mainly includes a water cap 41, an upper TC bearing moving ring 42, an upper TC bearing stationary ring 43, a multi-row angular contact thrust ball bearing 44, a pressure sleeve 45, a half ring 46, a spacer 47, a transmission shaft housing 48, a lower TC bearing stationary ring 49, a lower TC bearing moving ring 410 and a transmission shaft 411. The main function of the water cap is to connect the ball column transmission universal shaft and the transmission shaft, transmit the motion transmitted by the universal shaft to the transmission shaft, and guide the drilling fluid from the inner cavity of the universal shaft housing to the inner hole of the transmission shaft through the water hole, so as to provide water horsepower for the drilling tool connected below the screw drill; the upper TC bearing moving ring, the upper TC bearing stationary ring, the lower TC bearing stationary ring, and the lower TC bearing moving ring constitute the radial straightening system of the transmission shaft assembly, and its main function is to provide radial straightening for the rotation of the transmission shaft; the multi-row angular contact thrust ball bearing has a main function of providing an axial positioning for the transmission shaft. The drilling pressure borne by the transmission shaft is transmitted to the outer housing of the screw drill tool, and then to the gas drill tool assembly behind the screw drill tool; the upper TC bearing static ring, the multi-row angular contact thrust ball bearing outer ring, the spacer, the transmission shaft housing, and the lower TC bearing static ring constitute the fixed system of the transmission shaft assembly, and the water cap, the upper TC bearing dynamic ring, the multi-row angular contact thrust ball bearing inner ring, the pressure sleeve, the half ring, the lower TC bearing dynamic ring and the transmission shaft constitute the motion system of the transmission shaft assembly; the structure composed of the pressure sleeve and the half ring constitutes the anti-drop mechanism of the transmission shaft assembly, thereby improving the safety of the tool.

[0032] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A super-large diameter, super-large flow and super-high power screw drilling tool for super-large wells, characterized by: It includes a protection integrated assembly, an extra-large outer diameter motor assembly, a universal joint shaft assembly and a transmission shaft assembly which are connected in sequence; The integrated assembly includes an integrated joint, a hollow anti-drop nut, an alloy faucet, a pressure ring, an anti-drop gasket and a hollow anti-drop rod. The integrated joint is used to connect with the tool. The hollow anti-drop nut fixes the anti-drop gasket on the hollow anti-drop rod, and the required alloy faucet is fixed in the hollow anti-drop nut by using the pressure ring. The anti-drop gasket is engaged and fixed with the hollow anti-drop rod in a single flat manner. The super-large outer diameter motor assembly includes a 305mm outer diameter stator and a hollow rotor, wherein the 305mm outer diameter stator is composed of a 305mm stator housing inlaid with rubber and matched with the hollow rotor; The cardan shaft assembly includes a cardan shaft housing and a ball-column transmission cardan shaft. The cardan shaft housing connects the transmission shaft assembly and the motor assembly and provides a cavity for the ball-column transmission cardan shaft. The ball-column transmission cardan shaft is a universal mechanism with ball-column hinges at both ends, which converts the planetary motion of the motor assembly rotor into fixed-axis motion and transmits it to the transmission shaft of the transmission assembly. The transmission shaft assembly includes a water cap, an upper TC bearing moving ring, an upper TC bearing stationary ring, a multi-row angular contact thrust ball bearing, a pressure sleeve, a half ring, a spacer, a transmission shaft housing, a lower TC bearing stationary ring, a lower TC bearing moving ring and a transmission shaft. The water cap connects the ball-column transmission universal shaft and the transmission shaft, transmits the motion transmitted by the universal shaft to the transmission shaft, and guides the drilling fluid from the inner cavity of the universal shaft housing to the inner hole of the transmission shaft through the water hole. The upper TC bearing moving ring, the upper TC bearing stationary ring, the lower TC bearing stationary ring and the lower TC bearing moving ring constitute a radial straightening system of the transmission shaft assembly, providing radial straightening for the rotation of the transmission shaft; the multi-row angular contact thrust ball bearing provides an axial positioning for the transmission shaft, and transmits the drilling pressure borne by the transmission shaft to the outer housing of the screw drilling tool.

2. The ultra-large diameter, ultra-large flow and ultra-high power screw drilling tool for ultra-large wellbore according to claim 1, characterized in that: The hollow rotor is made of low carbon alloy steel to obtain a special-shaped surface matching with the stator, and the surface is chrome plated or sprayed with a tungsten carbide hardening surface coating.

3. The super-large diameter, super-large flow and super-high power screw drilling tool for super-large wellbore according to claim 1, characterized in that: The two ends of the hollow rotor are provided with stoppers.

4. The ultra-large diameter, ultra-large flow and ultra-high power screw drilling tool for ultra-large wellbore according to claim 1, characterized in that: The anti-drop gasket is a perforated gasket.

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