超深特高含硫边水气藏气驱水突破压差

在高含硫碳酸盐岩储层有水气藏的开发中,由于边底水沿裂缝或高渗条带突进,造成气井在水侵层位、水侵量等方面差异较大,气井见水后储层水锁情况复杂,导致气井产能和储量受到损失,更有高产水气井近井地带水锁停产,严重影响气藏稳产期和最终采收率;因此,这就需要定量研究气井储层水锁突破压差,明确解除水锁的条件,以针对性地制定水淹气井复产措施。采用多功能驱替系统,进行气驱水突破压差实验,研究了不同储层物性、不同水锁状态下突破压差变化规律。通过幂函数对实验结果进行回归,建立气井突破压差预测模型,定量预测不同渗透率和含水饱和度储层的突破压差。

Gas-driven water breakthrough differential pressure of ultra-deep and high-sulphur edge-water gas reservoir

During the development of high-sulphur carbonate gas reservoir with edge water,the edge-bottom water flows along the high permeability zone or fracture cause great differences of water influx and water invasion horizon of gas wells.The complicated situation of water block of water-producing results in productivity and reserve loss of gas well and the gas wells cut off with high water production,which affect the stable production period and recovery efficiency of gas reservoir.So,it is necessary to study the breakthrough differential pressure of the water lock of the gas reservoir and clarify the condition of removing the water lock to make specific measures.Using a multi-function displacement system and experiments of gas-driven water breakthrough differential pressure,this paper mainly discusses the change rule of breakthrough differential pressure in the different property and water block reservoir.Building breakthrough differential pressure forecasting model of gas well by power function regression,this paper also quantifies the breakthrough differential pressure of different permeability and water saturation.