Downhole drill bit thrust measuring device

Abstract

The invention discloses a downhole drill thrust measuring device connected between a drilling plug pipe column and a drill. The measuring device comprises a center pipe with an upper joint and an outer cylinder with a lower joint, the center pipe is installed in the outer cylinder, and the upper joint stretches out of the outer cylinder; a cylinder cover, a piston and an anti-rotation locking ring used for preventing the center pipe from rotating are arranged in the upper portion, the middle and the lower portion of a cavity of the outer cylinder respectively, the cylinder cover is in threaded connection with the inner wall of the outer cylinder and is in sliding connection with the center pipe, and the piston and the center pipe are connected through threads and can slide relative to the inner wall of the outer cylinder; a pressure oil cylinder is formed by airtight space defined by the outer cylinder, the center pipe, the cylinder cover and the piston in an enclosed mode, and the pressure oil cylinder is filled with hydraulic oil; an electronic pressure gauge is installed on the cylinder cover and used for measuring pressure of the oil in the pressure oil cylinder. The downhole drill thrust measuring device is simple in structure and convenient to operate, and actual thrust at the drill can be obtained according to the product of the difference between the intensity of pressure in the pressure oil cylinder before the drill is pressurized and the intensity of pressure in the pressure oil cylinder after the drill is pressurized and the annular area of the piston.

Description

technical field [0001] The invention relates to a downhole tool for oil and gas field development, in particular to a downhole drill bit thrust measuring device. Background technique [0002] Drilling bridge plugs or cement plugs is a commonly used operation in downhole operations. The efficiency of drilling plugs has a lot to do with the WOB applied to the drill bit. The existing technology uses the wellhead load, well inclination data, displacement, and liquid density to estimate the thrust at the drill bit. Since the displacement and liquid density are changing during the actual drilling process, the friction coefficient needs to be estimated, and the temperature in the wellbore Changes also affect the estimated value, so there is a certain error between the actual thrust at the drill bit and the estimated value, especially when the coiled tubing drill plug is used, the error is even greater, which brings inconvenience to the analysis and improvement of the drill plug eff...

AI Technical Summary

Problems solved by technology

The existing technology uses the wellhead load, well inclination data, displacement, and liquid density to estimate the thrust at the drill bit. Since the displacement and liquid density are changing during the actual drilling process, the friction coefficient needs to be estimated, and the temperature in the wellbore Changes also affect the estimated value, so there is a certain error between the actual thrust at the drill bit and the estimated value, especially when the coiled tubing plug is used, the error is even greater, which brings inconvenience to the analysis and improvement of the plug efficiency

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