Method for correcting well shaft pressure in real time

Abstract

The invention provides a method for correcting well shaft pressure in real time, and belongs to the technical field of petroleum drilling engineering. The method comprises the following steps: computing, according to basic parameters of bored well shaft pressure and pressure-controlled drilling boundary conditions, to obtain an annular pressure loss value before correcting of a to-be-measured well, and computing to obtain a hydrostatic column pressure value of the to-be-measured well; acquiring a practically-measured well bottom pressure value of the to-be-measured well by virtue of a pressure monitoring system while drilling PWD, and correcting, based on the pressure conservation principle, any one of well shaft pressure, wherein the well shaft pressure comprises well bottom pressure, annular pressure loss and well-mouth return pressure. According to the method provided by the invention, the well shaft pressure data is acquired based on the pressure conservation principle, and the well shaft pressure is corrected in real time by virtue of well shaft pressure data acquired by the PWD, so that the method has the characteristic that the correction for the well shaft pressure is simple, convenient, quick, and relatively high in precision; moreover, complex mesh generation and discrete solution on a control equation set are not required, so that requirements on performance of a computer are relatively low, and therefore, the method is more suitable for a site working condition for drilling construction.

Description

technical field [0001] The invention relates to a method for real-time correction of wellbore pressure by using a downhole pressure measuring tool, which belongs to the technical field of petroleum drilling engineering. Background technique [0002] With the development of oil exploration into deep and complex formations, complex downhole conditions such as narrow density windows, blowouts in the same layer, and blowouts coexisting have become technical bottlenecks that affect and restrict oil drilling operations. Narrow Density Safety Window The safe drilling window between formation pore pressure, fracture pressure and leakage pressure is relatively small. Under conventional drilling methods, the fluctuation range of annular pressure will exceed this safe drilling window, which may easily cause lost circulation, well kick and wellbore failure. Complex accidents such as drilling stability and pipe sticking lead to problems such as low production timeliness, long drilling cy...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of the existing wellbore pressure calculation method that the calculation process is complicated, the result error is large, and the calculation accuracy is difficult to meet the pressure-sensitive formation fine pressure management drilling wellbore pressure calculation requirements, the invention further proposes a method using downhole pressure measurement The method for real-time correction of wellbore pressure by tools specifically includes the following technical solutions:

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