Control method and system for drilling horizontal well and drilling system of horizontal well

Abstract

The invention relates to the technical field of well drilling, and discloses a control method and system for drilling a horizontal well and a drilling system of the horizontal well. The control method comprises the steps that for a sweet spot area of a pilot hole well and each target adjacent well, the depths of preset marks at preset number of feature points on a preset feature curve of a stratum within a preset range are determined; for the pilot hole well and each target adjacent well, the relation between the time when seismic waves return to the ground and the well depth is calibrated, and according to the depths of the preset marks, the positions of seismic events corresponding to the preset marks on a seismic section are calibrated; according to the calibrated relation between the time and the well depth, position data and a seismic velocity body, a velocity field model is built; according to the positions of the preset marks of the pilot hole well and the velocity field model, the first predicted depths of the preset number of preset marks of the horizontal well are predicted; and according to first predicted depth data, the horizontal well is controlled to be drilled through an element determination method and a rotation guiding method. The reservoir drilling rate of the continental shale gas horizontal well is greatly increased.

Description

technical field [0001] The invention relates to the technical field of drilling, in particular to a control method for drilling a horizontal well, a control system and a drilling system for the horizontal well. Background technique [0002] The Lishu fault depression is located in the southeast uplift area of ​​the Songliao Basin, and is a single-faulted dustpan-shaped fault depression. Among them, the sub-member I of the first member of the Yingcheng Formation is a continental semi-deep lacustrine-deep lacustrine depositional environment, dominated by thick black mud shale interspersed with thin dark gray siltstone at the fan delta front (siltstone thickness 1-2m , sandstone accounts for less than 10% of the formation). The mud shale is rich in organic matter, with well-developed laminae (developing nano-pores), and it is both a gas source rock and a reservoir rock. Since the mineral composition of mud shale generally contains carbonate rocks and has a high brittleness in...

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Problems solved by technology

[0004] The object of the present invention is to provide a kind of control method, control system and the drilling system of horizontal well that are used for drilling horizontal well, it can solve the problem when the longitudinal mark layer of continental mud shale is not obvious and the lateral lithology changes quickly. Tracking of continental shale gas horizontal wells, thus greatly improving the reservoir drilling rate of continental shale gas horizontal wells

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