Boring or penetrating the earth – With signaling – indicating – testing or measuring – Tool position direction or inclination measuring or...
Patent
1981-08-21
1983-07-05
Purser, Ernest R.
Boring or penetrating the earth
With signaling, indicating, testing or measuring
Tool position direction or inclination measuring or...
181104, 299 1, E21B 4709
Patent
active
043913369
DESCRIPTION:
BRIEF SUMMARY
DISCUSSION OF PRIOR ART
Several patents discuss the problems related with the boring of a hole parallel to a previously bored hole. U.S. Pat. No. 3,907,045 is one such patent which discusses an apparatus for boring an elongated bore hole with a drilling apparatus which contains a flux sensitive coil and directional drill apparatus. An antenna is inserted through a previously drilled bore hole and is connected between the ground and a sectional generating apparatus. Flux generated by the antenna will be picked up by the flux sensitive coil. Readout apparatus is connected to the coil and an indication of the magnitude of the flux being cut by the coil is determined. A control system coupled to the horizontal drill is then actuated to maintain the horizontal drill along a predetermined path which is substantially parallel to the bore hole previously drilled.
U.S. Pat. No. 3,853,185 discloses a drilling apparatus, likewise, used for forming a horizontal bore hole substantially parallel to a first-drilled horizontal bore hole. The previously drilled bore hole has a signal generating apparatus inserted into it. A horizontal drill is inserted into the subterranean stratum adjacent the first-drilled bore hole and operated until it is in the formation. The signal receiver contained in the horizontal drill apparatus will then receive a signal generated by the signal generating apparatus. The signal generating apparatus will always be maintained a fixed distance behind or in front of the horizontal drilling apparatus. The signal receiver in the horizontal drill will include an antenna sensitive to direction which can orient itself with the signal generating apparatus. Knowing the angle between the horizontal drill and the signal generating apparatus along with the distance along the first bore hole between the first bore hole and the signal generating apparatus will provide sufficient data to calculate the distance between the first horizontal bore hole and the drilling apparatus.
An application depending concurrent with this application, Ser. No. 104,627, filed Dec. 17, 1979, by Julian B. Coon and Bobby Thomas entitled "Coal Auger Guidance System" discloses another method for drilling two bore holes parallel to each other. The application, however, deals specifically with the drilling of auger holes which is also the subject matter of this specification. In the invention disclosed in the application an apparatus is described for drilling a bore hole parallel to a previously drilled bore hole and constructing a cart which has a rearward and forward steerable wheel with a detector mount attached to the cart. The detector mount will move the detector perpendicular to the axis of the bore hole and adjacent the wall of the bore hole. The detector includes apparatus for precisely orienting the detector a fixed distance from the wall to maintain a constant coupling which can be repeated each time the detector is moved. Apparatus is also provided in the cart to keep the detector mounting platform always parallel to a plan which passes along the gravitation of the bore hole wall.
Equipment outside the bore hole can determine the position of the cart and the detector for determining the distance between the bore hole. A seismic signal is positioned in the other bore hole to create a signal which can be received by the detection.
BRIEF DESCRIPTION OF THE INVENTION
This invention, like the former invention is a method for boring a second hole substantially parallel with another hole previously drilled. Unlike the previous concept this concept permits a more reliable determination of the variation distance between the bore hole and permits these readings to be taken without the addition of equipment into the formerly driven bore hole. The measuring equipment will be carried by the drilling apparatus and can be used during the quiet periods while additional augers are being added or removed to take the readings. The apparatus for performing the method essentially comprises a three-foot section of auger which contains a transm
REFERENCES:
patent: 3578807 (1971-05-01), Barrett
patent: 3853185 (1974-12-01), Dahl et al.
patent: 3907045 (1975-09-01), Dahl et al.
patent: 4184562 (1980-01-01), Bakamjian
Coon Julian B.
Fowler James C.
Payton Charles E.
Waters Kenneth H.
Conoco Inc.
Miller William J.
Purser Ernest R.
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