is designed for directional/horizontal wells and sidetracks trajectory monitoring and control while drilling using bottom-hole hydraulic motors.

Description

Features and Advantages

  • can be used for drilling borehole of big and small sizes, and also for sidetrack
  • reduces rig time and improves drilling quality;
  • allows directional/horizontal wells drilling control (with curvature radius up to 12-15 m);
  • static measurement
  • data transmission rate does not depend on the depth of the well
  • it doesn’t raise any requirements to drill mud
  • can be used for underbalanced drilling with deep aeration
  • provides an opportunity to research of horizons by GR method
  • can be run with pressure gauge module and near-bit module for zenith angle/axial, weight on bit, rpm, rock GR, hydraulic pressure, apparent resistivity measurement
  • telemetry software for data communication through “Remote drilling monitoring”
  • telesystem bottom-hole assembly retrievable while stinking.

As a housing of bottom-hole assembling uses standard non-magnetic drill collar, as a housing of relay – standard heavyweight drill pipe (TBT). According to the customer’s choice MWD is completed with a pressure module and a near bit module (NDM). ZTS-42KK Bottom-hole telemetry system is certificated and approved for use.

Specifications

Measurement range:

    zenith angle, grad

0-180 (± 0.2)

    azimuth, grad

0-360 (± 3)

         within zenith angle range 3º -7º; 173º-177º

0-360 (±3)

         within zenith angle range 7º -173º

0-360 (±1.5)

     whipstock angle, grad

0-360 (± 1.5)

         within zenith angle range 3º -7º; 173º-177º

0-360 (± 2)

         within zenith angle range 7º-173º

0-360 (± 1)

Measuring range of natural GR exposure dose power, microrad/h

0-100 (±15%)

Maximum operating temperature, ºC

120

Maximum operating pressure, MPa

60

Minimum internal diameter of drill pipe, mm

53

Telemetry system dimensions, mm:

         diameter

108; 172

         length

up to 6,000/10,000

         module diameter

42

Weight, kg

         retransmitter (without housing)

up to 30

         bottom-hole section (without housing)

up to 40

General view

1 – lap-top,  2 – driller panel,  3 – intercoupler,  4 – antenna,  5 – drill pipe,  6 – electric contact sub,  7 – contact sub,  8 – power supply module,  9 – coupling bars,  10 – heavy-weight drill pipe,  11 – connection module,  12 – electrical rod separator,  13 – housing top separator,  14 – screw nut,  15 – cable joint,  16 – mandrel sub,  17 – cable,  18 – cable head,  19 – downhole tool top,  20 – upper extension stem,  21 – upper centralizer,  22 – measuring transducer module,  23 – lower extension stem,  24 – lower centralizer,  25 – non-magnetic drill pipe,  26 – housing bottom separator,  27 – weight with rod separator,  28 – orienting sub,  29 – fixing wing,  30 – pressure module,  31 – bottom-hole whipstock,  32 – above-bit module,  33 – bit.