METHOD OF DRILLING OF INCLINED AND HORIZONTAL WELLS Russian patent published in 1999 - IPC

FIELD: methods of drilling and measurement of current coordinates of bottom of inclined and horizontal wells in drilling process. SUBSTANCE: method includes drilling of vertical well bore and installation in drilling assembly from the depth of crookedness increase of downhole motor, bent sub and landing device. Drilling of inclined and horizontal parts of well is accomplished by alternating use of rotary drilling and drilling by downhole motor, and current coordinates of well bottom are controlled by indications of inclinometer. After lowering and fixing of inclinometer in landing device, mounted into drilling assembly is lower guide accommodating electronic unit. Unit lower input is connected to upper cable connector running from inclinometer, and upper input, to system of cableless transmission of information to surface. Used in the latter are drill pipes and ball cock with chokes installed in nipples and tool joint boxes and interconnected with wire laid over pipe bodies and ball cock. Upper sub is mounted above ball cock and accommodating electronic unit. Its lower input in connected to system of cableless transmission of information, and upper input is connected with cable running inside kelly. installed above kelly is outlet pipe sub accommodating electronic block. lower input of unit is connected with upper connector of cable running inside kelly, and upper input is connected with cableless system of information transmission mounted on swivel. EFFECT: higher reliability of drilling. 3 cl, 1 dwg