Method, apparatus and electronic controller for mitigating stick-slip oscillations in drilling equipment
A technology for electronic controllers and drilling equipment, which is applied in mechanical vibration control, drilling automatic control systems, drilling equipment, etc., can solve problems such as the difficulty of approximating sinusoidal waveforms and the inability to correctly describe the physical behavior of drilling equipment, and achieve relief. Stick-slip, the effect of reducing stick-slip oscillation
Active Publication Date: 2017-02-22
ENGIE电气工程有限公司
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Problems solved by technology
[0014] The problem with this known method is that the frequency approximation does not correctly describe the physical behavior of the drilling equipment in the viscous mode where the bottom hole assembly comes to a complete standstill, since the velocity of the bottom hole assembly is clearly equal to zero
Additionally, the fact that the bottom-hole assembly rotates at a relatively low speed makes it more difficult to obtain a sufficiently accurate approximation of the sinusoidal waveform, and because practical drilling systems exhibit non-linear behavior
Method used
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[0081] figure 1A typical drilling rig 10 of a drilling rig for drilling boreholes in earth formations is shown in a schematic manner. The cutting tool used to drill these boreholes is called a drill bit 17 and is connected to the bottom hole assembly BHA11 at the bottom end face 13 of the drill wire 12 . At the top end face 14 of the drilling line, the drilling line 12 is coupled to a rotary drive system 15 .
[0082] Borehole string 12 comprises a length of hollow tubular or borehole pipe threaded together end-to-end. Typical borehole cables are several kilometers long, eg 0-10 km, and borehole pipes may have an outer diameter of about 100-300 mm and a wall thickness of about 10-50 mm. BHA11 comprises a heavier pipe, which may have an outer diameter of about 250-500 mm and a wall thickness of about 100 mm, for example known as a drill collar. The length of the BHA is typically in the range of 100-300m. The drilling string 12 is very slender compared to its length.
[008...
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To mitigate stick-slip oscillations in a drilling rig (10) when drilling a borehole in an earth formation, the drilling rig (10) is modeled (31) by a computational model for computer simulation. The model includes elements representing the specific mechanical and physical behavior of the drilling apparatus (10). In a simulated viscous mode of the drilling apparatus (10), a physical quantity is loaded onto the element, the physical quantity representing an initial state of the drilling apparatus (10) prior to transitioning from the viscous mode to the sliding mode. From the simulation of this transition, the time response of the drilling equipment (10) drive system (15) and the rotational speed of the bottom hole assembly (11) is recorded, and the drive system with zero rotational drive speed of the bottom hole assembly (11) is determined (15) The lower limit of the rotation speed.
Description
technical field [0001] The present invention generally relates to drilling equipment for drilling boreholes in formations of the earth. More specifically, the present invention relates to a method, device and electronic controller for mitigating stick-slip oscillations in such a drilling rig while drilling and a drilling device equipped with and according to such a method, device and electronic controller. Background technique [0002] The term borehole generally refers to the result of a drilling operation into the earth vertically, horizontally and / or deflected using a drill string comprising a drill bit at its lower end. ). At the upper or top end of the drilling line, the drilling line is driven at the surface by a drive system, called a top drive or rotary table. The top drive or wheel is driven by an electric motor or any other type of drive motor to provide rotary motion to the drill bit in the borehole. [0003] Typically, a borehole string is an elongated structu...
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IPC IPC(8): E21B44/00
CPCE21B44/00G05B13/04G05D19/02
Inventor 安德烈·威尔特曼
Owner ENGIE电气工程有限公司