Method of weight-on-bit control using radial jet pressure-on-bit controller

Abstract

The invention discloses a radial jet pressure-on-bit controller, which comprises an upper joint (1), a spring (3), a bearing sleeve (4), a center pipe (5), a sliding sleeve (6), and a lower joint (7) , the upper joint (1) is fixedly connected to the upper end of the central tube (5), the central tube (5) is arranged in the bearing sleeve (4), the upper end surface of the bearing sleeve (4) and the upper joint (1) The lower end surface is limited and matched, the sliding sleeve (6) is slidably arranged inside the lower section of the bearing sleeve (4), the lower joint (7) is fixed at the lower end of the sliding sleeve (6), and the spring (3) is set on the The center pipe (5) is outside, and the two ends of the spring (3) are arranged respectively between the bearing sleeve (4) and the sliding sleeve (6). Because there is a spring to control the ballast, it ensures stable and controllable application of drilling pressure, solves the technical problem that the unstable drilling pressure increases the difficulty of window opening operation, and improves the success rate and efficiency of radial jet drilling technology. The invention also discloses a drilling pressure control method.

Description

technical field [0001] The invention belongs to the technical field of drilling, and in particular relates to a pressure-on-drill control method. Background technique [0002] Radial jet drilling technology is a new technology for oil layer stimulation and production increase that has emerged in the world in recent years. The principle of the process is: use the coiled tubing with nozzles, and use the hydraulic rock-breaking effect of high-pressure jets to drill multiple small holes in different directions in the oil layer, penetrate the pollution zone laterally, increase the drainage area of ​​the original well, and increase the size of the original well. The discharge radius and area of ​​the eye can be adjusted to reduce oil flow resistance and increase production. During the implementation of this process, the motor is anchored in the tubing, the motor controls the drilling pressure, and the inner screw advances while rotating and drilling, and the drilling pressure dir...

AI Technical Summary

Problems solved by technology

However, since the motor is in the downhole, the vibration of the drill bit and pipe string will affect the control of the motor on the WOB when the window is opened, and it is difficult to effectively control the WOB on the ground, making it difficult to effectively control the WOB and apply the WOB stably, increasing the The difficulty of window opening operation reduces the success rate and efficiency of this process, and it is easy to cause equipment damage and economic loss

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