Boring or penetrating the earth – Processes – Boring curved or redirected bores
Patent
1986-04-17
1987-07-14
Novosad, Stephen J.
Boring or penetrating the earth
Processes
Boring curved or redirected bores
175 53, 175 67, 175 73, 175231, 175325, 175424, E21B 704, E21B 708
Patent
active
046796371
ABSTRACT:
An apparatus and method for drilling a pilot bore hole (B) along an underground arcuate path (P) between two surface locations (O, E). The pilot bore hole (B) is drilled in one direction with a drill string (10) having a leading pipe section (10A) of a reduced diameter to provide increased flexibility. Upon completion of the pilot bore hole (B), a reamer (48) connected to a product conduit (46) is connected to the drill string (10). Drill string (10) pulls the reamer (48) and product conduit (46) along the pilot bore hole (B) in an opposite direction for enlarging the bore hole (B) to receive the product conduit (46). A spud bit (34) has a flat or blunt leading end portion (34A) with a discharge opening (34D) therein to discharge high velocity drilling fluid into the formation at a location offset from the longitudinal axis of the drill string (10) to assist in guiding the drill string (10). An in-hole hydraulic motor (70) is provided in an embodiment (FIG. 7) for rotating the drill bit (78), and the longitudinal axis of a drive shaft (74) for the drill bit (78) is offset from the longitudinal axis of the drill pipe string (10) to assist in a deviation of the drill bit (78).
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Pet. Ext. Serv./Univ. Texas, 1969--"Controlled Directional Drilling", Unit III, Lesson I, (pp. I-19-I-24).
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Reynolds Metals Co.--Table 1--Properties-Reynolds Aluminum & Steel Drill Pipe (pp. 6-7)/Table 3-Reynolds Aluminum Drill Pipe 41/2' (pp. 10-11)/Table 6-Reed Alstan Tool Joints/Reynolds Aluminum Drill Pipe.
Cherrington Martin D.
Cherrington William D.
Letchford John F.
Novosad Stephen J.
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