An Integration Technology Of Underbalanced Perforating And Testing Research And Application In Development Wells

Perforation is a technology which shooting through casing,cement mantle and target stratum to establish the connected passageway between oil-gas-water. Perforation completion construction is the essential link of exploration and development of oil and gas field, Perforation effect has a direct influence on oil and gas well productivity, also has a major influence on the late increasing production and efficiency reconstruction measure. With the ever additional exploration and development of oil and gas well, the single well production improvement is becoming an importance aspect of the oil field increasing production and efficiency. However, the low porosity and low permeability reservoir widely distributed in development well in oil field, badness of the performance in conventional perforation and the long cycle, low inefficiency, little precision during in conventional development well testing, so many perforation techniques were researched and development by oil and gas company and field, and obvious results have been achieved. Among which, underbalanced perforation technology have become more widely used because of practicability for application, simply operated and remarkable result of promoting the capability of producing. Underbalanced perforation means keeping fluid column pressure in well lower reservoir pressure. Between underbalanced perforation instants formation fluid products a reverse flow, flushes bullet hole, lower the influence of the perforation compaction zones, thus avoids eyehole blocked up by Perforating residuum, and removes reservoir damage by perforating fluid. So the underbalanced perforation is a technique which can protect reservoir and improve the yield of single well.At present, the joint technology of perforation and formation testing is mostly applied in the exploratory well, the formation testing technology less used in the development wells, Shengli logging company combined underbalanced perforating operations with formation pressure testing operations, and successfully develop the integration technology of underbalanced perforating and testing. The instantaneous flow produced by underbalanced perforating cleaned perforation tunnels, reducing formation damage and improving reservoir capacity. During the fluid flowing into the wellbore the information test carried out. Under the ideal condition it carried out the test of formation pressure and temperature, the measurement of the reservoir pressure, temperature changes and formation fluid output before and after perforating, the analysis of the formation fluid supply capacity, and calculating reservoir capacity. The original formation pressure, formation permeability, skin factor and other reservoir parameters is obtained after interpretation for the measured pressure recovery curve, providing the study basis for reservoir characteristics, oil reservoir production dynamic control. Through the application in the development wells at Xianhe, Chunliang and other multiple blocks in Shengli Oilfield, it improved oil and gas production capacity, reduced the cost of development, and provided technical support for guiding the oil and gas reservoir reforming measure and production design developed.