Abstract

Drilling systems that use downhole rotation must react torque either through the drill-string or near the motor to achieve effective drilling performance. Problems with drill-string loading such as buckling, friction, and twist become more severe as hole diameter decreases. Therefore, for small holes, reacting torque downhole without interfering with the application of weight-on-bit, is preferred. In this paper, we present a novel mechanism that enables effective and controllable downhole weight on bit transmission and torque reaction. This scalable design achieves its unique performance through four key features: (1) mechanical advantage based on geometry, (2) direction dependent behavior using rolling and sliding contact, (3) modular scalability by combining modules in series, and (4) torque reaction and weight on bit that are proportional to applied axial force. As a result, simple mechanical devices can be used to react large torques while allowing controlled force to be transmitted to the drill bit. We outline our design, provide theoretical predictions of performance, and validate the results using full-scale testing. The experimental results include laboratory studies as well as limited field testing using a percussive hammer. These results demonstrate effective torque reaction, axial force transmission, favorable scaling with multiple modules, and predictable performance that is proportional to applied force.

References

1.
Zhang
,
Y.
,
Pan
,
L.
,
Dobson
,
P.
,
Oglesby
,
K.
, and
Finsterle
,
S.
,
2012
, “
Microholes for Improved Heat Extraction From EGS Reservoirs: Numerical Evaluation
,”
Proceedings of the Thirty-Seventh Workshop on Geothermal Reservoir Engineering
,
Stanford University
,
Stanford, CA
, pp.
1
6
.
2.
Albright
,
J.
,
Dreesen
,
D.
,
Anderson
,
D.
,
Blacic
,
J.
,
Thomson
,
J.
, and
Fairbanks
,
T.
,
2003
, “
Road Map for a 5000-ft Microborehole
,” Technical Report, Los Alamos National Laboratories, Los Alamos, NM.
3.
Pritchett
,
J.
,
1995
, “
Preliminary Estimates of Electrical Generating Capacity of Slim Holes - a Theoretical Approach
,”
Proceedings of the Twentieth Workshop on Geothermal Reservoir Engineering
,
Stanford University
,
Stanford, CA
, pp.
41
46
.
4.
Randolph
,
S.
,
Bosio
,
J.
, and
Boyington
,
B.
,
1991
, “
Slimhole Drilling: The Story So Far…
,”
Oilfield Rev.
,
1
(
1
), pp.
46
54
.
5.
Talalay
,
P.
,
2014
, “
Drill Heads of the Deep Ice Electromechanical Drills
,”
Cold Regions Sci. Technol.
,
97
(
1
), pp.
41
56
.
6.
Liu
,
B.
,
Wang
,
R.
,
Talalay
,
P.
,
Wang
,
Q.
, and
Liu
,
A.
,
2016
, “
Circulation System of An Antarctic Electromechanical Bedrock Drill
,”
Polar Sci.
,
10
(
Aug.
), pp.
463
469
.
7.
Talalay
,
P.
,
Fan
,
X.
,
Zheng
,
Z.
,
Xue
,
J.
,
Cao
,
P.
,
Zhang
,
N.
,
Wang
,
R.
,
Yu
,
D.
,
Yu
,
C.
,
Zhang
,
Y.
,
Zhang
,
Q.
,
Su
,
K.
,
Yang
,
D.
, and
Zhan
,
J.
,
2014
, “
Anti-Torque Systems of Electromechanical Cable-Suspended Drills and Test Results
,”
Ann. Glaciolog.
,
55
(
68
), pp.
207
218
.
8.
Wumkes
,
M.
,
1994
, “
Development of the U.S. Deep Coring Ice Drill
,”
Memoirs Nat. Inst. Polar Res.
,
49
, pp.
41
51
.
9.
Johnson
,
J.
,
Shturmakov
,
A.
,
Kuhl
,
T.
, and
Mortensen
,
N.
,
2014
, “
Next Generation of an Intermediate Depth Drill
,”
Ann. Glaciolog.
,
55
(
68
), pp.
27
33
.
10.
Suzuki
,
Y.
,
1979
, “
New Counter-Torque Devices of a Cable-Suspended Electromechanical Drill
,”
Low Temp. Sci. Ser. A
,
37
(
1
),, pp.
163
166
.
11.
Zagorodnov
,
V.
,
Thompson
,
L.
, and
Mosley-Thompson
,
E.
,
2000
, “
Portable System for Intermediate-Depth Ice-Core Drilling
,”
J. Glaciol.
,
46
(
152
), pp.
167
172
.
12.
Alden
,
M.
,
Arif
,
F.
,
Billingham
,
M.
,
Gronnerod
,
N.
,
Harvey
,
S.
,
Richards
,
M.
, and
West
,
C.
,
2004
, “
Advancing Downhole Conveyance
,”
Oilfield Rev.
,
16
(
3
), pp.
30
43
.
13.
Billingham
,
M.
,
El-Toukhy
,
A.
,
Hashem
,
M.
,
Hassaan
,
M.
,
Lorente
,
M.
,
Sheiretov
,
T.
, and
Loth
,
M.
,
2011
, “
Conveyance- Down and Out in the Oil Field
,”
Oilfield Rev.
,
23
(
2
), pp.
18
31
.
14.
Sheiretov
,
T.
,
2016
, “
Wireline Tractors and Mechanical Services Tools: Comparative Study of Technical Solutions
,”
Proceedings of the SPE/ICoTA Coiled Tubing and Well Intervention Conference and Exhibition
,
Houston, TX, Society of Petroleum Engineers
, pp.
1
21
.
15.
Maidla
,
E.
, and
Haci
,
M.
,
2004
, “
Understanding Torque: The Key to Slide-Drilling Directional Wells
,”
Proceedings of the IADC/SPE Drilling Conference
,
Society of Petroleum Engineers
,
Dallas, TX
, pp.
1
7
.
16.
Pink
,
T.
,
Koederitz
,
W.
,
Barrie
,
A.
,
Bert
,
D.
, and
Overgaard
,
D.
,
2013
, “
Closed Loop Automation of Downhole Weight on Bit Improves Sliding Performance and Reduces Conservatism in Unconventional Horizontal Well Development
,”
Proceedings of the SPE Annual Technical Conference and Exhibition
,
New Orleans, LA, Society of Petroleum Engineers
, pp.
1
14
.
You do not currently have access to this content.