复合油藏段塞流数学模型的建立及求解

SLUG FLOW MATHEMATICAL MODEL AND ITS SOL, UTION FOR COMPOSITE RESERVOIR

在解释油井的不稳定测试资料时，对井筒中流体流不出地表的段塞流动，采用常规解释方法获得的地居参数不能反映地层的真实特性。通常在钻井和完并过程中，储集居将不可避免地受到损害，形成污染带。针对这种复合油藏特征，建立了井筒流体段塞式流动的数学模型，并求得其拉氏空间的解。同时，研制出了用于分析实测压力历史的理论图版。利用理论图版，对储集层的正、负污染和未污染等情况均可进行分析。通过对实测压力历史的分析，可以得到井底储集层污染程度和污染半径等参数，这对指导开发过程中的增产措施具有重要的意义。该模型的解适用于分析钻井完并过程中的DST测试资料和低渗透油藏非自喷井的不稳定试并资料。

The parameters obtained by using traditional methods to analyze the pressure history of slug flow cannot reflect the real state of formation- Usually, during drilling and well completion, the formation will be damaged unavoidably.Therefore, there will be a damaged region in the formation near the bottom hole. In view of slug flow of the composite reservoir, a mathematical model is developed in this paper and its solution in Laplace Space has also been derived. Two sets of theoretical type curves have been plotted out to analyze pressure history. The type curves are suitable for pressure history analysis of damaged formations as well as undamaged formations. The radius of damaged area and the permeabilities of the damaged area as well as the natural area can be gotten, which are very important for reservoir stimulation. This model is suitable for DST data and pressure transient analysis of lower permeability reservoirs.