Method for drilling and milling sliding sleeves and ball seats of horizontal well by continuous oil pipe

Abstract

The invention discloses a method for drilling and milling sliding sleeves and ball seats of a horizontal well by a continuous oil pipe. The method comprises the following steps of: (1) driving a combination of a sleeve and a back insertion sealing pipe string; (2) mounting ground equipment and connecting through a pipeline; (3) driving the continuous oil pipe and a drilling and milling tool; (4) detecting the positions of the sliding sleeves and the ball seats; (5) starting a pump, injecting drilling and milling liquid, and slowly driving the continuous oil pipe; (6) performing drilling and milling operation, and controlling weighting within the range of 0.5-1.5 tons during drilling and milling; and (7) upwards lifting the continuous oil pipe 5-10m when every sliding sleeve and the ball seat are completely drilled, enabling the drilling and milling liquid to circulate one cycle and operating till the completion of drilling and milling of all the sliding sleeves and the ball seats in a shaft. According to the method for drilling and milling the sliding sleeves and the ball seats of the horizontal well by the continuous oil pipe, disclosed by the invention, an underground tool combination of the sliding sleeves and the ball seats can be continuously drilled and milled through the continuous oil pipe, the ground pump injection equipment and a liquid drive drilling and milling tool are utilized for drilling and milling the sliding sleeves and the ball seats of the horizontal well, the drilling and milling efficiency and the utilization rate of the drilling and milling liquid are improved, and the well workover cost is also reduced.

Description

technical field [0001] The invention belongs to the technical field of oil and gas well workover, and in particular relates to a method for drilling and milling a sliding sleeve and a ball seat of a horizontal well with a coiled tubing. Background technique [0002] Drilling and milling, as one of the commonly used techniques in oil and gas well workover engineering, has played an important role in vertical well workover. In recent years, with the development of horizontal well technology, horizontal well development has become an important way to increase single well production, improve development effect and enhance recovery. development becomes reality. The staged fracturing process of pre-installed open hole packer + sliding sleeve has become the main means of horizontal well stimulation, but this process has the following two problems: ①Once there are problems such as sand plugging in the horizontal section due to the multi-stage sliding sleeve in the well The inner d...

AI Technical Summary

Problems solved by technology

The staged fracturing process of pre-installed open hole packer + sliding sleeve has become the main means of horizontal well stimulation, but this process has the following two problems: ①Once there are problems such as sand plugging in the horizontal section due to the multi-stage sliding sleeve in the well The inner diameter is limited, and there are certain difficulties in subsequent operations (such as horizontal section testing, gas lift, etc.)

②After staged fracturing, the pipe string cannot be pulled out, the location of the fracturing crack is not clear, and the seal cannot be checked and repeated reconstruction is impossible

[0003] The drilling and milling sliding sleeve and ball seat technology has become the key technology to solve the follow-up problems of horizontal well staged fracturing. The conventional drilling and milling process is realized by adding drilling and milling tools to ordinary tubing, but due to the outer diameter of the tubing, the size of the coupling and the Due to the limitation of the wellbore trajectory of horizontal wells, it is difficult to run the tools, and the flat tubing needs to be connected continuously during the drilling and milling process. It is easy to produce problems such as sand burial and drill sticking, which make the drilling and milling string unable to be pulled out. Therefore, the conventional drilling and milling process is not suitable for drilling and milling operations in horizontal wells

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