Self-contained compact rotary steerable system
A self-sufficient rotary steerable system configured to provide a bottom hole assembly with a build-up rate of at least 25 degrees per 100 feet of drilling distance. The rotary steerable system has a reduced length without the removal or omission of functional components, including a power module, a control module, a communication module, a filter module, a valve module, and/or a pressure regulation module. The build-up rate is defined as a function of a length between a first contact point on a drill bit of the bottom hole assembly and a second contact point at a piston assembly of the rotary steerable system; length between the second contact point and a third contact point at a stabilizer of the rotary steerable system; the drill bit outer diameter; the piston assembly outer diameter; and the stabilizer outer diameter.
1. A bottom hole assembly, comprising:
a drill bit having a first contact point;
a rotary steerable system including a steering section, a power module, and a stabilizer; wherein the steering section has a second contact point and the stabilizer has a third contact point; wherein the power module is configured to generate power for the rotary steerable system, wherein the power module is disposed between the first contact point and the third contact point;
wherein the bottom hole assembly is configured to achieve a build-up-rate (BUR) of at least 25 degrees per 100 feet of drilling; wherein the BUR is defined as:
BUR
=
216
,
000
π
D
0
2
(
R
1
+
R
2
)
[
PU
R
1
+
PU
R
2
-
SU
R
2
]
Where:
R
1
=
L
1
D
0
R
2
=
L
2
D
0
PU
=
D
0
-
D
P
SU
=
D
0
-
D
S
L 1 =length between the first contact point and the second contact point (inches)
L 2 =length between the second contact point and the third contact point (inches)
D 0 =outer diameter of drill bit (inches)
D P =outer diameter of rotary steerable system at piston assembly (inches)
D S =outer diameter of rotary steerable system at stabilizer (inches).
2. The bottom hole assembly of claim 1 , wherein L 1 is less than 23 inches.
3. The bottom hole assembly of claim 2 , wherein L 1 is less than 21 inches.
4. The bottom hole assembly of claim 3 , wherein L 1 is less than 19 inches.
5. The bottom hole assembly of claim 4 , wherein L 1 is less than 17 inches.
6. The bottom hole assembly of claim 5 , wherein L 1 is less than 15 inches.
7. The bottom hole assembly of claim 6 , wherein L 1 is less than 13 inches.
8. A rotary steerable system, comprising:
a steering section having a second contact point;
a stabilizer having a third contact point;
a power module configured to generate power for the rotary steerable system, wherein the power module is disposed between a downstream end of the rotary steerable system and the third contact point; and
wherein the rotary steerable system is configured to be secured downstream of a flex shaft and upstream of a drill bit in a bottom hole assembly; wherein the drill bit has a first contact point; and wherein the bottom hole assembly is configured to achieve a build-up-rate (BUR) of at least 25 degrees per 100 feet of drilling; wherein the BUR is defined as:
BUR
=
216
,
000
π
D
0
2
(
R
1
+
R
2
)
[
PU
R
1
+
PU
R
2
-
SU
R
2
]
Where:
R
1
=
L
1
D
0
R
2
=
L
2
D
0
PU
=
D
0
-
D
P
SU
=
D
0
-
D
S
L 1 =length between the first contact point and the second contact point (inches)
L 2 =length between the second contact point and the third contact point (inches)
D 0 =outer diameter of drill bit (inches)
D P =outer diameter of rotary steerable system at piston assembly (inches)
D S =outer diameter of rotary steerable system at stabilizer (inches).