Firstly, the horizontal trajectory tracking guidance laws are established by the virtual vehicle method, where the tracking error equations are derived.
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Fluoroscopic guidance with a horizontal anteroposterior x-ray beam was used to properly visualise the joint space.
They also gave valuable guidance for engineering design of horizontal porous plates.
Based on the requirements, we design a 2D suboptimal guidance law used in the horizontal plane; combining the 2D vertical suboptimal guidance law, we create a whole ballistic simulation of six degree-of-freedom.
By independent application of this planar law for homing guidance on the vertical and the horizontal plane, three-dimensional evasive guidance is easily synthesized.
When the proportional navigation guidance (PNG) law is used in the horizontal planes, the landing angle will obviously decrease.
Affected by mutual interference from guidance of radial slim holes and controlling of horizontal in-situ stress, fractures tend to distort along fracture length and fracture height.
The model in this paper provides a theoretical guidance for the optimization design method and operating parameters of horizontal ERW in shales to achieve a longer horizontal-section limit, which is significant for the use of shale gas.
This study simultaneously investigates the effects of anisotropic seepage and weak bedding planes on wellbore stability during drilling horizontal wells, it is promising to provide a theoretical basis and practical guidance for the further researches on wellbore stability in future.
