靖边气田压降曲线偏转特征及原因分析

Deflection Characteristics and Cause Analysis of Pressure Drop Curve of Jingbian Gasfleld

利用压力测试资料建立了靖边气田气井的压降曲线，用以追踪动储量的变化特征。根据气井不同开发时刻的p／Z和Gp数据作图，得到3种类型的压降曲线，分别是直线型、后期下偏型和后期上翘型。其中，直线型气井生产较平稳．具有相对独立的控制区域，且控制区内储层物性较均匀；后期下偏型主要是由井问干扰和边界效应所致；后期上翘型主要由于地层能量损耗减少、外围低渗带补给或增压开采所致。对于下偏型和上翘型压降曲线应选取后期直线段外推得到其动态储量。靖边气田以直线型压降曲线为主，井网系统的适用性较强。

The use of stress testing data to huild a gas pressure drop curve Jingbian field to track changes in dynamic characteristics of reserves. Aceonting to different development wells moments P / Z and Gp data mapping, to be three kinds of types of pressure drop curves are linear, the latter part of the next partial-and post-warping model. Among them, linear gas production of more stable, with relatively independent control area, and the control of the region more uniform reservoir properties： the latter part of the next partial model mainly by the hole due to interference and boundaL＇y effects： late upturned- type energy loss mainly due to formation decrease in permeability with the external supply or pressurization caused by mining. Upturned for the next partial-and late-type pressure drop curve of a straight-line segmenl should be selected by their extrapolation dyuamic reserves. Jingbian gas field to a linear pressure, drop curve of the main, well the applicability of a strong network system.