Water regime logging method for oil gas of oil well

Abstract

The invention concerns an oil gas water dynamic logging method adapted for low mineralized stratum. It adopts neutron lifetime well logger to record the state of oil well stratum exploitation, oil extraction by the producing well and remaining oil distribution. The steps are: a. recording the neutron lifetime curve of oil well without injecting the thermal absorption agent by neutron lifetime well logger b. injecting gadolinium solution to the oil well then sealing the canister to pressurize for not less than 30 to 60 minutes c. recording neutron lifetime curve The invention has large neutrino capture cross-section accurate practical data, and small used dosage. It can provide basis for searching the water producer, finding out pending container rock, solving the interlayer interference and increasing the production, it can also provides the basic data for the multi -well remaining oil evaluation.

Description

technical field [0001] The invention relates to a monitoring technology for oil exploration and production oil wells, in particular to a dynamic logging method for oil, gas and water in oil wells that can be applied to formations with low salinity. Background technique [0002] There are two different types of well logging techniques currently used. One is conventional well logging. The technique is relatively simple, and the acquired logging data information has a lot of interference and strong ambiguity. One is the special logging process. In order to improve its information quality, a certain substance (tracer) is applied to the logging formation of the oil well, and the amplitude difference of the logging curve is used as the analysis object. This method Compared with conventional logging techniques, it is more pertinent and has higher accuracy. [0003] There are two commonly used techniques in special logging, one is the nuclear magnetic logging technique using the "i...

AI Technical Summary

Problems solved by technology

Chinese patent application No. 96108617.3 discloses a method of using boron element and neutron lifetime logging tool to find residual oil. The method uses boron element solution as a measurement tracking agent and injects it into oil in low salinity oilfields. In water wells, follow-up measurement is carried out, and at the same time, the remaining oil and the distribution of residual oil in the oil layer are measured with the neutron lifetime logging instrument, which solves the problem that the existing neutron lifetime logging instrument can only measure the remaining oil and residual oil in high salinity oilfields. Insufficient residual oil, a new measurement method and prospect for seeking residual oil and residual oil in low-salinity oilfields, improving the recovery rate of oilfields

However, the neutron capture cross section of this method is small, and it cannot be used in oil well formations with formation porosity less than 15%, and it cannot provide the situation of remaining oil including movable oil and immovable oil, especially in the case of low temperature on site. It is not easy to dissolve and cannot be completely injected into the formation

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