Method for monitoring wellbore trajectory in real time while drilling for gas drilling

Abstract

The invention discloses a method for monitoring a wellbore trajectory in real time while drilling for gas drilling. The monitoring method comprises the following steps that a drill stem gesture tester is axially arranged on a near-drill drill stem and located at the lower part of the drill stem; the drill stem gesture tester is internally provided with a gravity accelerometer and an azimuth sensor; the gravity accelerometer is used for monitoring an inclined angle of the gesture tester in real time; the azimuth sensor is used for monitoring an azimuth value of the gesture tester in real time; all sensors in the gesture tester transmit monitored real-time data to the ground through a microwave transmission relay in the drill stem. The method disclosed by the invention has the advantages that during a drilling process, monitored data sent by the gesture tester in real time are read many times on the ground according to measurement points with different depths in a well, a coordinate position of the gesture tester on each measurement point in the well is obtained by means of calculating the monitored data of the measurement point, and then a wellbore trajectory image obtained through real-time monitoring are drawn according to the coordinates of the gesture tester, obtained from the different measurement points, in the well.

Description

technical field [0001] The invention relates to a gas drilling technology, in particular to a method for real-time monitoring of gas drilling well trajectory while drilling. Background technique [0002] In the drilling construction process of oil and gas wells, in order to ensure that the drill bit of the drill string can drill to the set target area, it is necessary to grasp the actual drilling trajectory of the drill string in the downhole at any time during the drilling process—that is, the wellbore trajectory. In this way, the drilling construction of the subsequent well section can be correctly guided through the design of the wellbore, and the quality of the drilled wellbore trajectory can be guaranteed. [0003] However, during the drilling process of oil and gas wells, the actual drilling trajectory cannot be inspected intuitively with human eyes or instruments, and a large amount of data including the drill string can only be obtained through logging instruments du...

AI Technical Summary

Problems solved by technology

However, the application of logging methods usually requires suspension of drilling operations, which will not only prolong the drilling construction time and reduce drilling efficiency, but also greatly increase the risk of gas drilling when it is applied to gas drilling operations. In order to minimize the number of logging operations for gas drilling, it is usually necessary to drill in a blind drilling manner, and then log after the drilling is stopped, which will seriously affect the quality of the wellbore trajectory drilled by gas drilling, and the safety and reliability are poor.

[0006] Although the seismic while drilling method can measure and map the wellbore trajectory in real time, it has high requirements on the geological conditions of the construction site, is susceptible to interference, and has low precision. At present, there is no mature seismic measurement system while drilling suitable for gas drilling. and measures

[0007] In summary, the existing mainstream well trajectory monitoring technology has various deficiencies in the application of gas drilling operations, resulting in gas drilling can only be applied to vertical well drilling operations with simple well structure, which limits its application in wells. Applications in drilling sites such as extended-reach wells, directional wells, and horizontal wells with complex structures

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