Efficient drilling system and method for bottom-hole punching, swirling and stepping combined unloading and rock breaking

A rock-breaking and swirling technology, which is applied in the direction of drilling drive devices, drilling equipment, drill bits, etc. in the wellbore, can solve problems such as failure to meet the expected indicators on site, and achieve the effect of increasing service life and improving efficiency

Active Publication Date: 2022-02-18
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Improving the rock-breaking efficiency is a hot spot in the field of drilling engineering. Improving the rock-breaking ability and life of rock-breaking tools and strengthening the rock-breaking energy at the bottom of the well are the most commonly used methods to improve rock-breaking efficiency. According to the above methods, so far it has formed A variety of rock-breaking drilling systems. Practice has shown that the above-mentioned systems have improved the rock-breaking efficiency to a certain extent, but they have not yet reached the expected indicators on site. How to further improve the rock-breaking efficiency has become a bottleneck problem restricting drilling in hard and difficult-to-drill formations.

Method used

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  • Efficient drilling system and method for bottom-hole punching, swirling and stepping combined unloading and rock breaking
  • Efficient drilling system and method for bottom-hole punching, swirling and stepping combined unloading and rock breaking
  • Efficient drilling system and method for bottom-hole punching, swirling and stepping combined unloading and rock breaking

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Experimental program
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Effect test

Embodiment 1

[0065] like figure 1 As shown in the figure, the bottom-hole rush-rotation step combined unloading and rock-breaking high-efficiency drilling system includes a casing 1 in a cylindrical structure; the casing 1 is provided with a drive assembly 2, a cardan shaft that are connected in sequence along the axial direction. Section 3, transmission shaft 4, rotary impact assembly 5; the end of the rotary impact assembly 5 is provided with a drill bit 6; wherein the rotational power of the drive assembly 2 is transmitted to the transmission shaft 4 through the universal joint 3, and the transmission shaft 4 Then, the rotating power is transmitted to the rotating impact assembly 5, and the rotating impact assembly 5 transmits the rotating power to the drill bit 6; at the same time, in the actual production process, the casing 1 can be designed and produced in sections according to the actual situation, so as to facilitate the drive assembly 2 , the installation of universal joint 3, tr...

Embodiment 2

[0104] A high-efficiency drilling method for rock-breaking with bottom-hole swirl-stepping combined unloading and rock-breaking is implemented based on the high-efficiency drilling system for bottom-hole swash-rotating stepping combined with unloading and rock-breaking in Embodiment 1, and the drilling method includes the following steps:

[0105] 1) Pump the drilling fluid into the drive assembly 2, and the pressure energy of the drilling fluid is converted into the rotational mechanical energy of the rotor 202, which is transmitted to the drill bit 6 by the universal joint 3, the transmission shaft 4, and the rotary transmission assembly;

[0106] 2) The annular drill bit 601 first contacts the bottom of the well, and under the action of the weight-on-bit torque, the rock at the outer ring of the drill bit 6 is broken; during the rotation of the rotary transmission assembly, under the action of the bottom-hole reverse push force, the impact assembly The high-frequency impact ...

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Abstract

The invention discloses a high-efficiency drilling system for bottom-hole punching, rotary stepping combined unloading and rock breaking, which includes a casing, a drive assembly, a universal shaft joint, a transmission shaft, a rotary impact assembly, and a drill bit; the transmission shaft is rotatably connected to the casing; The rotary impact assembly includes a rotary transmission assembly used to transmit rotational power to the drill bit, and an impact assembly used to provide high-frequency axial impact power for the drill bit; when the rotary transmission assembly rotates with the transmission shaft, the impact assembly exerts force on the rotary transmission assembly High-frequency impact force in the axial direction; the outer end of the drill bit is provided with a ring drill bit; the inner ring end surface of the ring drill bit is slidingly fitted with a center drill bit; a concave cylindrical area is formed between the head end of the ring drill bit and the head end of the center drill bit . The invention discloses a high-efficiency drilling method for bottom-hole punching, rotary stepping combined unloading and rock breaking. Through the overall structural arrangement, the present invention can realize the functions of stepping rock breaking, well bottom unloading, and punching and rotating drilling at the same time, which greatly improves the rock breaking drilling efficiency.

Description

technical field [0001] The invention belongs to the technical field of drilling, and in particular relates to a high-efficiency drilling system and method for rock breaking through combined unloading and rock breaking at the bottom of the well. Background technique [0002] Improving the rock-breaking efficiency is a hot research topic in the field of drilling engineering. Improving the rock-breaking capacity and life of rock-breaking tools and enhancing the bottom-hole rock-breaking energy are the most commonly used methods to improve the rock-breaking efficiency. A variety of rock-breaking drilling systems have been used. Practice has shown that the above-mentioned systems have improved the rock-breaking efficiency to a certain extent, but have not yet reached the expected field targets. How to further improve the rock-breaking efficiency has become a bottleneck restricting drilling in hard and difficult-to-drill formations. [0003] The relationship between the rock-break...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B4/16E21B10/38E21B10/43E21B10/60
CPCE21B4/16E21B10/38E21B10/43E21B10/602
Inventor 刘永旺魏森管志川邹德永
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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