Dynamic Analysis Of Single Well In Jingbian Gas Field Reserves Evaluation And Its Variation Characteristics

Jingbian gas field across Shaanxi province and the Inner Mongolia Autonomous Region two provinces, Yuyang District, Jingbian County, Hengshan County, Yulin City, Shaanxi Province, mainly located in the Yanan City, Ansai county and Zhidan county and the Inner Mongolia Autonomous Region Wushen territory. Gas field is about 370km long from north to south, east-west width of about 90km, were long and narrow distribution, gas fields in the south is located in the Loess Plateau, located in the northern part of the south margin of Maowusu Desert, the altitude of 1096～1823m. Development has experienced four stages: pre evaluation test (1991～1996), well in pre production stage (1997～1998), the scale of the development stage(1999～2003), the stable production stage (2004～present). Is the domestic first large-scale gas field found in one of the large and medium-sized city, shoulder the task to Beijing, Shanghai, Xi’an, Hohhot etc..Dynamic reserves of gas reservoir percolation refers to flow or is that part of the natural gas geological reserves, set size and supply layer volume boundary distance underground storage reaction gas well control, related to geological reserves, the degree of control of production wells and sweep coefficient. Jingbian gas field development time is long, has been in the stage of steady production of gas field, the well pattern is perfect, lift something on the side is the year rolling development, further verification of gas well dynamic reserves (reservoirs), to improve the well network area is the geological reserves producing degree and distribution of remaining reserves in the important symbol of one of the later development of regional. The dynamic reserves of gas reservoir, gas well production system, and can be a potential capacity, stable production period and the reasonable well spacing and provide a scientific basis for potential can encrypt area. In a word, in different stage of gas field development, determine the dynamic reserves has important guiding significance to development of gas fields.For the idealized infinite reservoir dynamic reserves, single well control should be a constant value, but some gas wells in Jingbian gas field production process is affected by environment, verify the dynamic reserves compared with previous years changed significantly, also built in recent years due to technical limitations, such as type parameter causes less without verification, this study focuses on the analysis of law and Countermeasures gas reserves, reserves of dynamic changes cause changes, new type of well dynamic reserves calculation, analysis of the characteristics of reservoir geology and exploitation, and puts forward the reasonable suggestion for the later development of gas field.In the process of gas field development, master the gas well dynamic reserves (gas) is one of the important sign of reserves, productivity evaluation, well pattern and well spacing, both at home and abroad there are many ways to calculate the dynamic reserves, Jingbian gas field through calculation comparison of many years, strong applicability of unstable method to determine the pressure drop method, yield, the calculation results more accurate, by calculating the master Jingbian gas field dynamic reserves. The calculation part well in previous years the process, dynamic reserves obviously change, change the factors analysis of variation characteristics of the influence of dynamic reserves reserves, and what measures to take to improve the producing degree of reserves later.