Research On Development Character Of Condensate Gas Reservoirs With Edge And Bottom Water Of Tahe Oil Field

Proportion of the continuous development of the petroleum industry as well as the growing demand for clean energy, and greatly accelerate the development of the natural gas industry, a series of gas fields have been developed, the rapid increase in production, the world’s total energy, has become one of the main source of energy in the world.With the in-depth exploration and development of gas fields, gas condensate field in the world gas field development plays a very important position, and a large proportion of reserves in the world, China has been discovered a lot of complex condensate side of the end of Condensate Gas Reservoiris a very complex condensate gas reservoir, is also an increasingly important position in the gas condensate field development.CoMPared with the conventional oil and gas reservoirs, oil and gas condensate system seepage, and accoMPanied by a complex phase change in the mining process. When the flowing bottom hole pressure is lower than the dew point pressure, the bottom of the well near the precipitation of condensate and the formation of condensate saturation region, resulting in the bottom of the well near the gas effective permeability decreases, the gas well production decline rapidly, the yield lower than the minimum gas wells with liquid will effusion within the wellbore. Condensate gas reservoir development process in the edge and bottom edge and bottom water is present, resulting in edge water onrush and bottom water coning, fleeing into the wellboreThe gas reservoir development features throughout the oil and gas development has always been, the gas reservoir of scientific development, management, the need for timely and accurately grasp the dynamic analysis of the gas reservoir development of the dynamic characteristics of the system.Tahe Oilfield has developed and the data over the full three main edge and bottom Condensate Gas Reservoir (of AT1, THN1dalaoba) study, structural characteristics to describe the gas reservoir and fluid characteristics, improve the recovery of the gas reservoirgoal, the use of the gas reservoir dynamic analysis methods, static and dynamic characteristics of the starting gas condensate reservoir, and a detailed analysis of the development of dynamic characteristics of gas wells and gas reservoirs, reservoir engineering and numerical simulation methods to evaluate the size of the edge and bottom water energythe iMPact of the development. Flooding, and to delay the see water gas well on the1st block of dalaoba, for example, the use of numerical simulation software simulation of the gas reservoir development methods preferred, and the optimization of work systems and production methods using liquid discharge. On the basis of the above study, this article follows some research results and understanding of:1. ATI blocks of Tahe Oilfield Petroleum group is higher in the hypertonic sandstone bottom water with condensate faulted anticline gas condensate reservoir. Put into the beginning of the trial mining stage by stage development characteristics is broadly divided into three development phases:production stage, stable stage, descending phase of development has access to high-water period. Petroleum group gas well productivity higher, block the initial production average daily gas production capacity of8.1×104m3.The current pressure to maintain a level of92.3%, with the downward trend of gas production slows, continuous bottom water coning to replenish their energy, block anti-condensate is not serious.Anhydrous phase and to avoid the water height and the gas layer thickness has a good correlation, namely, to avoid the water height is higher, the gas layer with increasing thickness, anhydrous longer the period. Gas wells anhydrous and mezzanine development is not clear. Well most of the early production were higher than the bottom water coning critical production, bottom water is easy to breakthrough to the bottom of the well block the initial production gas can produce large pressure difference, easily lead to bottom water coning.the bottom water coning exacerbate the ridge into the bottom of the well-invasive high position in the production layer, gas and be more serious closed can not be effectively adopted out, the gas production declined sharply cause gas condensate closed mining, condensate production also showed a decreasing trend.2. Tahe Oilfield THN1block Triassic Petroleum Group is in the hole in the hypertonic sandstone edge water with the oil ring higher condensate faulted anticline traps gas condensate reservoir. Gas well, the static pressure recovery to replenish their energy mainly through the edge of water coning and gas wells static pressure changes to reflect the edge water promote the supplement and gas well gas wells complement to the higher parts of the fluid to replenish their energy situation. The high parts of the gas well energy supplement in a timely manner, resulting in the high parts of the gas reservoir formation pressure fell to the edge of the well is flooded, the gas reservoir of natural gas energy shortage. Block the initial presentation of the constant volume gas reservoir pressure drop characteristics of the water flooding the energy supplement late, late curve upturned water influx. Aquifer characteristics is realized increased speed for the gas well, water content,, resulting in rapid increase of water content; gas reservoir transition zone spotty flooding, and the pure gas zone linearly flooding, and no large-scale flooding. Anti-condensate feature realized for the gas well production, well weeks retrograde condensation occurs; pure gas zone gas well anti-condensate is more severe than the degree of edge wells anti-condensate, the condensate caused by the decline in the range of22-98%; gas reservoir has not yet been to the largest anti-condensate fluid volume, with the development of further exacerbated the extent of anti-condensate.3. Dynamic analysis method on the1,2dalaoba construct water sources judgment, the majority of gas wells producing water from the edge and bottom water, but also lead to gas well the Minting effusion of reasons. DLK4, DLK10X only output a small amount of condensate water, no formation water. Structure dalaoba Condensate massive underground gas reservoir and gas wells in the water situation in the performance of the bottom water coning.2dalaoba the constructor Suweiyi group gas reservoir side Condensate gas reservoir and gas wells in water form of the potential performance edge water propulsion. Suweiyi gas reservoir under the groups of and Condensate edge of the layered gas reservoirs, northeastern well see water performance edge water propulsion by the artment development, part of the well performance of the characteristics of the bottom water coning see water in the form. The Structure dalaoba2Bashijiqike Condensate gas reservoir in the layered side coMPartment development, the most well performance, see water characteristics for water coning. Dalaoba gas reservoir gas reservoir, the main production water invasion characterized by the advance in the gas area of the edge region in the north of the gas well is easy to see the water.4.The block dalaoba2006invasion of water, with the development of faster and faster, formation water influx rate, the production process in the gas reservoir pressure drops rapidly, the description of the gas reservoir natural gas energy. Reservoir engineering and numerical simulation method for evaluation of the size of the water body dalaoba on the1st block a multiple of the water about eight times less energy of edge water. The2constructor of the dalaoba a multiple of the water about10to17, the water edge and strong energy.5.The production of the gas reservoir of dalaoba drain optimization of work systems,the preferred orientation of the liquid volume of700m3/d development effect of the best, to increase the recovery level more than20%.