Study On The Integrative Monitoring Of Remaining Oil For Low Permeability Sand Reservoir

Proved reserves of low permeability reservoirs account for 26.1% of the total OOIP in our country and 87% of which are low permeability sand reservoirs by the end of 2005. With the development strategy transferring to the secondary/ternary reservoir, the development of low permeability reservoirs have became the main field. The characteristics of those reservoirs determine the complex of the distribution rules about remaining oil. According to the singularity and limitation of monitoring technology for remaining oil, the integrative monitoring technologies were applied in bare hole and casing hole to interpret water flooded layer & remaining oil saturation in fault block Wei 81 of zhongyuan oil field. The thesis deals mainly with:Technology method for the integrative monitoring were submitted and applicated. The integrative monitoring study for remaining oil was developed based on using single monitoring technology and integrating the integrative monitoring. The technology built the integrative monitoring system from dot to line & plane and were applied to other 5 blocks.Due to the issues for the platen SP curve of low-permeability or high-salinity reservoir, the difficulty for getting resistivity of mixed liquid, the interpretation technology of high water-cut layer was built depended on relative magnitude of resistivity using the result of lithology & electrical property experiment and analyzing water-cut mechanism of low permeability sand reservoir. The criterion of water flooded degree classification was established on the basis of water production rate.The single monitoring technology was improved according to the characteristic of low permeability sand reservoir. Construction technique of the neuron life logging was improved, and the new C/O quantity interpretation clue was developed on the basis of argillaceous calibration.The ration of separated zone water injection was studied in case of the water injection profile or having no this profile. A new method about dynamic split of cumulative rate of water injection was founded, automatic software was developed on the basis of the experiment research.Aim at having a lot of fracturing and profile controlling for low permeability sand reservoir, adopt the in-phase test between the group of oil & water well group and radial complex intepreted model to study the plane pressure distribution. 3D reservoir resistivity imaging and monitoring technique was used in low permeability sand reservoir. Achieved the monitoring from dot to plane, extend the monitoring range of remaining oil; meanwhile pressure distribution was confirmed using improved numerical well logging technique.