A steerable well drilling apparatus comprising: a tubular housing having a cylindrical inner peripheral surface; a first orienting assembly and a second orienting assembly spaced apart along the inner peripheral surface of the housing; an orienting sleeve rotatably supported between the first orienting assembly and the second orienting assembly, the orienting sleeve having an angled bore wherein a first longitudinal axis of the angled bore is inclined by a predetermined angle to a second longitudinal axis referenced to a cylindrical outer peripheral surface of the orienting sleeve; a rotatable steering shaft extending axially through and rotatably supported along the angled bore to control rotatable steering shaft bending, the rotatable steering shaft operably coupled to a drill bit for drilling a well; the first orienting assembly and second orienting assembly are disposed within the housing to control the orienting sleeve which can be oriented to change the direction of steering shaft; an orienting sleeve actuator operably coupled to the orienting sleeve to controllably rotate the orienting sleeve with respect to the housing and the first and second orienting assemblies (220A, 220B); and a controller operatively coupled to the first orienting assembly, the second orienting assembly, and the orienting sleeve actuator to controllably adjust the steering direction of the rotatable steering shaft by actuation of the first orienting assembly, second orienting assembly, and orienting sleeve actuator to thereby orient the steering shaft and bit in a desired three dimensional direction to control the path of borehole. a tubular housing having a cylindrical inner peripheral surface; a first orienting assembly and a second orienting assembly spaced apart along the inner peripheral surface of the housing; an orienting sleeve rotatably supported between the first orienting assembly and the second orienting assembly, the orienting sleeve having an angled bore wherein a first longitudinal axis of the angled bore is inclined by a predetermined angle to a second longitudinal axis referenced to a cylindrical outer peripheral surface of the orienting sleeve; a rotatable steering shaft extending axially through and rotatably supported along the angled bore to control rotatable steering shaft bending, the rotatable steering shaft operably coupled to a drill bit for drilling a well; the first orienting assembly and second orienting assembly are disposed within the housing to control the orienting sleeve which can be oriented to change the direction of steering shaft; an orienting sleeve actuator operably coupled to the orienting sleeve to controllably rotate the orienting sleeve with respect to the housing and the first and second orienting assemblies (220A, 220B); and a controller operatively coupled to the first orienting assembly, the second orienting assembly, and the orienting sleeve actuator to controllably adjust the steering direction of the rotatable steering shaft by actuation of the first orienting assembly, second orienting assembly, and orienting sleeve actuator to thereby orient the steering shaft and bit in a desired three dimensional direction to control the path of borehole.