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General Information

The RDT reservoir dynamic logging instrument is based on the oxygen activation logging instrument and the full spectrum saturation logging instrument, combined with the latest logging instrument technology at home and abroad, and a set of combined oxygen activation logging, neutron lifetime log and full spectrum saturation well in the domestic complex gas field, in order to solve the medium content and formation in the wellbore. A comprehensive logging tool with gas saturation and oil saturation.

Specifications：

Pressure of the shell of the instrument: 80Mpa

Working temperature: -25 C - +175 C

Instrument diameter: [Phi] 43mm

Instrument length: < 5m

Sigma measurement range: 7.6c.u - 91c.u

Sigma measurement accuracy:

Energy measurement range: 0.52-9.3MeV;

Energy resolution: better than 9% (to 137Cs)

Recommended speed: 60-180 m/h

After 20-40 hours, we will provide detailed explanation results.

According to the single layer production conclusion, the explanation of the coincidence rate is 80%

Benefits and Features 

The full spectrum logging is carried out through the oil pipe, avoiding the risk, cost and additional error caused by the oil pipe.

- multiple downhole parameters can be obtained at once, and the interpretation coincidence rate of remaining oil saturation is increased.

- based on new detector and spectral data processing technology, the dynamic range of the instrument is large, and the reservoir water layer can be determined qualitatively under the condition of less than 10% porosity, and the porosity is more than 15% for quantitative interpretation and evaluation.

Under certain conditions, quantitative interpretation and evaluation of oil saturation, gas saturation and water saturation are carried out.

The optimization control of the parameters of the neutron generator has the advantages of high neutron yield, good neutron yield stability and long service life, which is beneficial to improving the measuring precision of the instrument.

- the measurement of activated oxygen, well temperature and natural gamma, so as to make the dynamic evaluation of each reservoir into reality, and tell people how the layer is absorbing water in the water and that layer, and what measures should be taken for the production;

Equipped with a complete spectrum processing and interpretation software, the coincidence rate of comprehensive evaluation and interpretation is over 80%. Provide an overall solution for on-site well logging and post measures recommendations.

Example

- lateral drilling and vertical wells are used to measure the residual oil saturation in different porosity conditions, and the porosity is more than 15% for quantitative analysis. The porosity 15%-10% is semi quantified and the porosity is less than 10%.

- Exploration and evaluation of lost oil and gas reservoirs in abandoned wells or overhauls.

- Detection and evaluation of oil and gas reservoirs and oil-water interfaces in freshwater, low-salinity or unknown-salinity water migmatics and complex lithologic formations.

- in the water drive project, the distribution of the oil saturation and the fresh water migration in the oil field block are evaluated.

- using logging data to find water layer and potential layer, evaluate the level of water flooding in the production layer, recognize the law of reservoir, find out the water level of the water, and provide the basis for controlling the water and increasing the oil.

- quantitative measurement of gas saturation.

XXX well, perforation No. 33-38, which is very high watered out before logging. After logging, it is found that the No. 33-34 layer is not used, carbon oxygen ratio is explained as oil layer, and the carbon and oxygen ratio of No. 35-38 layer is extremely high flooding characteristics, among which the 35, 37 and 38 layers of natural gamma are abnormal, indicating that the three layers are the main producing layers, and the natural gamma after layer 36 shows that the layer is not used, so the layer of water flooded is explained. It is caused by backflow; activated oxygen shows that there is water overflow in layer 37, indicating that No. 37 is the main production layer. The comprehensive interpretation and determination of the main aquifers in the No. 37 layer, 35 and 38 level to produce water layer, the 36 layer is the low pressure inversion layer, because of inverted irrigation can not be measured in the water flooded layer; No. 33-34 layer no water flooded layer. It is suggested that the No. 35-38 layer be blocked and the No. 33-34 layer is produced. As a result, geological recognition and actual production proved that the water cut was greatly reduced, which was the low water flooded reservoir with low production.

The well logging interpretation is interpreted as the Qingshui River formation system of the dry layer (10-13), which has high oil saturation and is suitable for industrial exploitation. Through the trial production, the oil production is 10-15m, and the oil and gas response is obvious in the block Qingshui River formation.