2results about How to "Increase the encounter rate" patented technology

The application discloses a dynamic shale gas horizontal well stratum dip angle prediction method, which comprises the following steps: establishing a shale reservoir velocity model; preparing a shale reservoir structure map, and designing depths of target points A and B of a shale gas horizontal well, wherein the target point A is a starting position of a horizontal section of the shale gas horizontal well, and the target point B is an ending position of the horizontal section of the shale gas horizontal well; calculating a stratum dip angle alpha of the whole horizontal section according to a horizontal distance and a longitudinal distance between the target points A and B; after entering the target point A, a stratum dip angle beta is predicted by using depth data of first and last points of a preset distance drilled this time, the velocity model is updated by using the depth data of the first and last points of the preset distance drilled this time, the structure map is prepared again, a stratum dip angle gamma of a next drilling distance of the horizontal section is predicted by using the prepared structure map again, and a reference stratum dip angle theta of the next drilling distance of the horizontal section is determined according to the three stratum dip angles alpha, beta and gamma, so as to serve as a guide for drilling of the horizontal well. The method can effectively improve a high-quality shale drilling ratio of the shale gas horizontal well, improve drilling efficiency of the horizontal well and save drilling cost.

The application discloses a method and device for adjusting a drilling trajectory of a horizontal well. First, a standard well used for stratum comparison with a well to be drilled is determined, and a horizontal well geosteering model is established in combination with geological data and drilling engineering data. A current well resistivity while drilling and a while drilling gamma curve are compared with a standard well logging curve, and a target point vertical depth is calculated. In combination with a real-time response of a while drilling azimuthal resistivity boundary detection curve, a landing point of a target layer is determined, and a suitable hole inclination angle is used to enter the layer. A drilling trajectory and a relative position relationship with a stratum interface are determined by fitting a while drilling simulation curve of the horizontal well geosteering model with a current well actual drilling curve. A stratum interface azimuth and a distance from the trajectory to the interface are determined in real time by developing a while drilling azimuthal resistivity boundary detection rapid inversion, and the horizontal section drilling trajectory is adjusted. In combination with logging data and directional actual drilling characteristics, a layer position where the trajectory is located is judged, and a sand body distribution and a stratum change trend are predicted in combination with a regional seismic profile, so that the drilling trajectory is pre-adjusted.