A real-time seismic-geological integrated steering method for horizontal drilling

Abstract

The invention discloses a horizontal drilling real-time seismogeology comprehensive guiding method. The method comprises the following steps that (1) three-dimensional prestack time deepened seismic data are explained in a known oil and gas field work zone, and an initial guiding model of a well to be drilled is obtained; (2) lithological, electrical and seismic reflection characteristics of marker beds, a target oil and gas layer and adjacent stratums in the oil and gas field work zone are determined; (3) before a forward drilled well enters the target, the velocity field is updated in real time, and an improved guiding model of the forward drilled well is obtained; (4) when the forward drilled well encounters one marker bed and is about to enter the tarter, the altitude depth of a target-entering point of the forward drilled well is predicted, and trajectory optimization before target entering is conducted; (5) after the forward drilled well enters the target, the velocity field is updated again, and thus the newest guiding model is obtained; and (6) under the guidance of the newest guiding model, a horizontal section guiding is conducted by combining with practical drilling analysis. According to the seismogeology comprehensive guiding method capable of correcting the guiding model in real time, the effects that the horizontal well enters the target layer accurately and efficiently penetrates through the target layer can be guaranteed.

Description

technical field

[0001] The invention relates to the technical field of petroleum and natural gas development, in particular to a real-time seismic-geological comprehensive steering method for horizontal drilling. Background technique

[0002] Horizontal drilling can greatly increase the oil and gas drainage area of ​​the target production layer and improve the recovery efficiency of oil and gas layers. It is the key to the efficient development of unconventional oil and gas reservoirs such as tight oil reservoirs and shale gas reservoirs. Steering plays a vital role in the drilling process of horizontal wells. It is the key to ensure that horizontal wells enter the target layer accurately and the horizontal section travels efficiently in oil and gas layers, and directly affects the single well productivity of horizontal wells.

[0003] Traditional horizontal drilling steering generally includes: establishment of steering model before drilling, trajectory optimization before ...

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