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 ; 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 ; 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 . <EOS>