With the needs of oil and gas field producers and constructors in the secondary potential excavation of old wells, the casing window sidetracking ultra-short radius horizontal well engineering service technology came into being. This technology can effectively improve the well pattern layout and develop various types of oil reservoirs reasonably and effectively. It can not only save the comprehensive cost of drilling and oilfield development, but also greatly improve the recovery rate and economic benefits, especially for the thin oil and gas layers that are difficult to develop.

The ultra-short radius sidetracking horizontal well technology can be used to develop the unproduced oil layer outside the original well surface, expand the oil drainage area of the developed oil layer, and drill through the interlayer to make the adjacent well drilled on the basis of the structure of the old well. Reservoir connectivity, thereby increasing old well production.
During the operation, the fiber optic gyro inclinometer is used together with the inclinometer to measure the positioning in the casing, and then the milling cone is used to open the window for side drilling; the short-radius inclinometer is used for the measurement while drilling, the short-radius screw is used to build the inclination, and the high-performance composite Salt drilling fluid reduces friction. Among them, the fiber optic gyro inclinometer and the short radius inclinometer are two of the indispensable measurement equipment.