Study On Water Flow Law Of Gas Well And Water Invasion Mechanism In B-P Reservoir

B-P gas reservoir is located in the central region of Amu Darya right bank.It is a Marine carbonate reservoir.Reservoir types are complex and diverse,Fractures are relatively developed,Water is more active.The gas reservoir type is mainly fractured-pore type.The reservoir matrix is characterized by low porosity and low permeability.At present,some wells are producing water.It affects the long-term stable production of the gas field.It is urgent to put forward effective measures to control water.This paper is based on the practical problems in the development of B-P gas reservoir to clarify gas well the mechanism of producing water and provide technical guidance.The main research results obtained in this paper are as follows:? The gas reservoir is the anticlinal structure,It is an abnormal high pressure fractured-pore type carbonate rock gas reservoir with bottom reservoir under the dual control of structure and lithology.The gas reservoir has 10 strike-slip faults and reverse faults.Formation fracture development is mainly in the middle and high Angle.?A flowchart of producing water of gas well is established.?A set of diagnostic methods can be used to determine the type of water intrusion.In addition,the water-invasion pattern of the fractured bottom water gas reservoir is divided into three types:Bottom water normal coning type,High-guide seam or high permeable layer channeling type,Near wellbore outflow.? The reasons for producing water of the gas well have five types:?P/L is big,Bottom water is active,Fractures are developed,Fault affects result,External layer water inflows.? Experimental results of water invasion mechanism show that bottom water activity,pressure failure rate and fracture dip affect water breakthrough time of wells and recovery degree of gas reservoir.?The numerical simulation results show that different water invasion models have different effects on producing water of gas well.Water breakthrough time of gas wells and recovery degree of gas reservoir are different.stress sensitivity is biger,recovery degree is smaller.? Reasonable production of gas well is about 13.5%of open flow potential.? On the basis of Geological characteristics and technical characteristics.Gas wells reduce producing water by water control,water exploration,water shutoff and drainage.