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Motary Steerable System

Motary Steerable System directional control system combined the advantages of two traditional technologies, i.e., the mud motor technology and the rotary steering system (RSS), therefore, the directional drilling is optimized. By introducing the Calibrated Drill Speed Direction (TBS), a new directive technology, the limitations of conventional mud motor such as requiring direction through sliding and resulting a series of drilling problems are overcame. The full rotary steering system is economical and its advantages are obvious in low angle building hole rate drilling, anti-inclination direct application drilling, extended-reach horizontal well drilling, over-length horizontal well drilling and long angle holding section drilling. The system can not only realize an efficient directional control, but also reduce the risk of drilling.

Scope of Application:

(1)Applicable to 6〞-12 1/4〞wells;

(2)Applicable to stratum with less possibility of angle building by rotary steering;

(3)Extended-reach well and over-length horizontal well;

(4)Geological parameters like gamma, resistance and neutron density cannot be loaded during drilling.

Technical Principle：

In nature, the full rotary steering system is an integrated system which is equipped with a steering motor and a dedicated MWD. By controlling drilling rate with adjustable mud, this technology realizes a fully 3D directional control and continuous rotation of drill string with no more need of sliding. In comparison with conventional mud motor steering technology, this technology has a higher drilling efficiency and a better well cleansing performance.

Technical Features：

(1)With a combination of motor and rotary steering, both motor sliding direction and rotary steering can be realized.

(2)At long angle holding section and horizontal section, full rotary steering of drilling tool can be realized and a smooth well can be obtained.

(3)The cost of TBS is lower than that of rotary steering.

Technical Indicators：

Tool sizes (in.)

4-3/4

6-1/2

6-3/4

8-1/2

Dedicated motor model

(ratio of rotor to stator, number of stages)

7:8

5.0

7:8

3.0

7:8

5.0

7:8

4.0

Borehole size (in./mm)

5.875 to 6.750

159 to 172

7.875

200

8.500 to 9.875

216 to 251

10.625 to12.25

270 to 311

Maximum angle building hole rate

(°/100ft,°/30m)

3.0°

2.0°

1.5°

Length of tool (ft/m)

63.94

19.49

64.50

19.66

64.99

19.81

65.42

19.94

Upper buckle type

3-1/2 API IF Box

4-1/2 API IF Box

5-1/2 API IF Box

Lower buckle type

3-1/2 API Reg Bxo

4-1/2 API Reg Box

5-1/2 API Reg BOX

Min. initial deflecting angle

0°

Displacement (gpm/Lpm)

150 to 300

568 to 1136

200 to 600

757 to 2271

300 to 600

1136 to 2271

300 to 900

1136 to 3407

Drill speed (rpm)

50 to 335

40 to 160

45 to 240

300 to 1000

Max. output torque (ft-lb/N.m)

5620

7622

6810

9234

12780

17330

18320

24842

Max. output power (hp/kW)

300

224

175

131

370

276

490

365

Max. differential pressure (psi/KPa)

1200

8274

600

4137

1200

8274

1000

6895

Max. allowable pickup (static condition) (lb./daN)

185000

82000

288000

128000

387000

171000

Max. bit allowable pickup (static condition)

51000

23000

81000

36000

95000

42000

112000

49800

Max. downhole temperature(° F/° C)

356°

180°

Max. downhole pressure (psi/KPa)

30000

206843

25000

172369

Max. allowable sand content

2％

Service Ability and Performance：

In 2013, the company successfully completed the full rotary steering of 3 wells at an oil field in Liaoning Province. Among all the 8.5’’ wells, the highest angle building hole rate is 3.5 ° /30m. Among all the directional drillings of same kind at same block, the sliding ratio of wells using full rotary steering technology is 35% lower.