Description of Well Condition:
Chengu-H303, program borehole size 215.9mm, program depth is 5817.25m, vertical is 4630m, kick off point is 4250m, and horizontal section is 1100m. Chengu-H303 is the first horizontal well with deepest program in Liaohe Oilfield. The estimated bottom static temperature is between 145℃ to 155℃. It is very difficult for construction and brings great challenge to engineering and measurement.
Operating Situation of HT-MWD650:
1. On 20:00 April 15 2011, the instrument was descended into well. The initial well depth was 4180m. Till 09:30 June 11 2011, the well depth was 5730m. The instrument operated 1320 hours without any failure.
2. The instrument was descended into well, operated smoothly. The well depth was 5730m. The pulse signal was strong, transmission speed was fast and error rate was low.
3. After the down-hole instrument was taken out, disassembled and checked, the pulser and probe’s ground tests showed normal. Spare parts was normal without any erosion. The spare parts were assembled again without exchange, waiting for next descending.
4. After descending instrument into well, pump pressure was 15-25 MPa. There were 16 trips done when well depth is from 4180m to 5730m. The instruments worked downhole 1320 hours. During assembling on surface and operating downhole, there was any fault due to instrument’s failure.
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