水驱气藏气井见水后，产气产水规律复杂，使得水驱气藏开发难度显著增大。就目前水驱气藏而言，缺乏相应成熟有效的动态分析方法。从气、水两相渗流规律和物质平衡方程出发，推导出了水驱气藏的水驱特征曲线，即累计产气量与气水比呈对教关系，在半对数坐标上呈线性关系，矿场可以根据直线的斜率反算见水后气井的动态控制储量，通过某气田气井开发动态检验，该研究成果可以有效预测气井的开发动态和开发过程中动态控制储量的变化，对于水驱气藏开发具有一定指导意义。

Water/gas-yielding rules in the water-drive gas reservoir become complicated after water breakthrough, which results in the increasing dififculty of the water-drive gas reservoir development. At present, there is no mature and effective dynamic analysis method in developing the water-drive gas reservoir. Based on the gas-water two-phase lfow law and the material balance equation, the water-drive characteristic curve of water-drive gas reservoir was developed in this paper, in which the cumulative gas production is in logarithmic relation with gas-water ratio, and in linear relation on semi-logarithmic coordinates. And the dynamic control reserve of gas well after water breakthrough can be inversely calculated by the slope of the line. By the application on a certain gas ifeld, the research results were proved to be able to effectively predict the gas wells development performance and the dynamic control reserve variation during development. And it is of great signiifcance to the develo

气井出水影响气井生产，尽管气井堵水是治理气井出水的有效方法，然而该技术的研究因其操作难度大、风险大而进展缓慢，仍处于实验室研究阶段。文中首先分析了气井堵水难度大、风险大的原因在于选择性堵水的需求，进而在吸收、借鉴国内外已有研究成果的基础上研究形成气井化学堵水新方法，认为遵从三类选择性堵水原理可有效堵水，第一类是堵剂材料本身在注入地层后具有气水选择性；第二类是堵剂进入产水气层后使岩石表面润湿性向憎水方向改变，提高气相相渗，降低水相相渗；第三类是堵剂遇水发生物理、化学反应发生膨胀、聚集、或沉淀，起到堵水作用，遇气则无封堵作用。从全气藏的角度提出了气藏整体治水方法，该研究对气井化学堵水方法研究提供了借鉴。

Water production from gas wells affects gas production. Though water shut-off is an effective method to cure water production on gas wells, the research and development on water shut-off technique has little progress, because of dififculty and risk of the treating operation, and it still locates at indoor research stage. The paper ifrstly analyzed the reason of high dififculty and high risk of gas well water shut-off, which is the demand of selective water shut-off treatment. Furthermore, based on the absorbing and referencing of the current research progress at home and abroad, from the view point of water shut-off principles, three novel types of water shut-off methods are formed. The ifrst principle is that the water shut-off agent itself has gas-water selection capacity after injected into reser-voirs;the second one is that the agent changes wettability of rock surface into more hydrophobic after getting into water beard gas for-mations, resulting in gas relative permeability incre

为得到高煤阶储层煤层气井排采的压力-产气-产水动态平衡关系,揭示不同压力控制下的煤储层煤层气井排采的流体效应及机制,以沁南地区X1和X2煤层气井为研究对象,在X1煤层气井排采阶段划分的基础上,分析了不同压力条件下的煤储层煤层气井排采解吸规律及流体效应;研究了不同排采阶段的套压、动液面高度、井底压力及枯竭压力与产能的关系;数值模拟了X2煤层气井在压力控制前后的产能变化特征。结果表明:煤层气井排采的流体效应取决于是否对排采见气初期套压进行控制,排水阶段结束后采用蹩压、控压的排采制度,可有效提高煤层气井的产能。

In order to obtain the dynamic equilibrium relationship among pressure,gas and water production in coalbed methane well drain-age of high rank coal reservoir,and reveal coalbed methane drainage effect as well as its mechanism under pressure control,taking X1 well and X2 well in southern Qinshui basin as examples,and based on drainage stages classification of X1 well,fluid effect and desorption laws in the two coalbed methane wells drainage were analyzed under changing pressure,relationships among gas production and casing pressure, dynamic liquid level height,pressure of downhose,depletion pressure were discussed and researched,and the variation characteristics of gas production before and after pressure control of X2 well were numerically simulated.The results showed that fluid effect in coalbed methane wells depend on control of casing pressure in the initial stage of drainage,a shutoff pressure and controlling pressure production system could contribute to coalbed methane well produ

气井积液是产水气藏开发设计和气井生产管理面临的重要问题,但目前对气井流动机理与携液预测还存在争议。从气液两相流的基本流动机理出发,建立了考虑液滴变形和井斜影响下气井井筒的流型、温度、压力与携液综合预测模型,并用实际井数据对模型进行了验证。结果表明,所建模型可用于直井、斜井和水平井的产水气井井筒温度压力预测,预测误差小于5%;在环雾状流动情况下,井筒内液体以液滴和液膜的形式被完全带出井口,不会出现井筒积液;对常规垂直气井,利用井口数据便能判断气井积液情况,Turner模型计算气井携液临界值较实际值偏大,李闽模型计算结果明显偏小,建议采用彭朝阳模型计算气井携液临界值;对斜井和水平井,则需要同时考虑液滴变形和井斜的影响,水平井近水平段携液临界流速和流量明显较垂直井段小,而造斜井段携液临界流速和临界流量随井斜角的增大先增大后减小,在井斜角为30°~60°之间达到最大值,因此造斜井段是气井积液判断的重点部位。

Accumulated fluid in gas well is a key issue confronted in development design of water-producing gas pools and pro-duction management of gas wells, but at present, there are controversies on flow mechanism and water carrying prediction in gas wells. From the basic flow mechanism of two-phase flow of gas and liquid, a comprehensive prediction model was built to predict the flow pattern, temperature, pressure and water-carrying in gas wells, and this model was verified using actual well data. The result shows that the model so built can be used to predict the wellbore temperature and pressure of water-producing vertical wells, deviated wells and horizontal wells, and the prediction error is less than 5%. Under condition of annular mist flow, the fluid in the wellbore is carried out of the wellhead completely in the forms of liquid drop and membrane, so no wellbore water shall be accumulated; for conventional vertical gas wells, the wellhead data can be used to determine the accumulated f

应用考虑气液相间滑脱与流体沿井筒截面非均匀分布的漂移模型,结合动量守恒、能量守恒和井筒传热学,建立考虑井斜变化的气井井筒温度、压力耦合预测模型,通过15口实测井数据对模型进行验证.结果表明：所建模型可以准确计算产水气井井筒的温度和压力,计算结果平均绝对误差3.60%,满足工程计算要求.

Based on drift model which copes with gas-liquid phase slippage and non-uniform distribution along section of wellbore, a coupled temperature-pressure prediction model was established for varied angle gas wellbores considering momentum conservation, conservation of energy and wellbore heat transmission. The model was validated with 15 tested gas wells. The calculation showed satisfying results with average absolute error of 3?6% which meets engineering requirements.