Abstract: With the wide application of steam flooding, SAGD and fire-flooding in heavy oil reservoir, the bottomhole temperature of oil production wells gradually increases, and the maximum temperature could reach 260 ℃, which greatly limits the long-term bottomhole temperature and pressure direct reading monitoring with available cables and high temperature testing instruments. A acoustic direct reading monitoring technology of bottomhole temperature and pressure was developed by encoding the bottomhole temperature and pressure data. Acoustic transmission was adopted to transmits the signal to wellhead through production string. The wellhead signal collector receives the signal and obtains the bottomhole temperature and pressure data by decoding and calculation. 5 wells application indicate that the recorded temperature and pressure data on the surface are consistent with that stored in the instrument, which could also provide certain real-time guidance for the well production system adjustment. This technology realizes the long-term temperature and pressure direct reading monitoring in heavy oil well with thermal recovery treatment and could provide certain guidance for the well production performance analysis and production system adjustment, which can significantly improve the well production performance.

Key words: thermal recovery of heavy oil, direct reading monitoring, temperature and pressure data, acoustic transmission, high temperature monitoring, high pressure monitoring