Study On Gas Reservoir Engineering Of Low Concentration And Production Of Carbon Dioxide Gas

Carbon dioxide, gas with high commercial value, drawing more attention with the development of industry and increaseingly demand of petroleum and gas. At present, few overseas reference have been published about this territory of carbon dioxide gas reservoir, interiorly, the knowledge and development of carbon dioxide gas reservoir is also finite.Shurennouer gas reservoir in Hailer basin of Daqing oil field, classified into structural-fault block reservoir formed by opposite direction downslip fault. The gas reservoir’s structure including six light block, which under the control of WU-xi block, and the features of these block in gaseous section are exhibited as below:light tectonic scale; high downthrow; low reserves abundance and permeable sublayer; high content of carbon dioxide, about 90.61%～98.81%, similar to the pure gas of carbon dioxide; fringe water and bottom water exist, for the above, it is significant for exploitation of Shurennouer gas reservoir to probe into the development technique of this kind of carbon dioxide gas reservoir.This theme select the layer of number 1 of Nan formation in Su2 and Su3 block of Shurennouer gas reservoir as objective, based on the investigation of relevant reference including exploitation case and theory research, combine with geology and reservoir geology, gas reservoir engineering and numerical simulation technique, acquire effort through polytropical research involve geological model, features of production test, fluids rate evaluation, exploitation system analysis, demarcation on layer series of development, well pattern disposition, exploitation plan preference and development index prediction.(1) By analyse well test data, account that the gas reservoir can be classified into low permeable gas reservoir, fracturing obtained remarkable effect in majority wells, and gained valuable carbon dioxide gas current.(2) Place stress on reservoir protection is indispensable to advance gas well’s deliverability for the reservoir had been damaged. As for water breakthrough from some gas wells, monitoring on production performance is also necessarily.(3) Based on the pressure build up test and pressure fall off test, calculate the individual well estimated reserves, which bases on the method of pressure recover and elasticity two-phase. The result shows the increasing of individual well estimated reserves.(4) Preliminary analysis on the geological information, detect the gaseous section has not developed interbedded stratum in Nantu group. Design a depleted development of well pattern that avert the production from separate zones, under the condition of the features of carbon dioxide are considered and the results of geologic research are banded(5) Based on combination of gas reservoir engineering and numerical simulation, number of development wells, well spacing, productivity index and production scale have been worked out, ultimately,4 development plans are been established, the simulation of the development index from the 4 plans proceed at the same time, for preference the best plan to offer technical assistance and theory evidence to fit the exploitation of gas reservoir in the early stage.