Study of reducing method for static bottom-hole pressure in deep gas wells

The deep gas wells of Qingshen gas field in Daqing are characterized by the great well depth,high bottom temperature,high bottom pressure and gas production with water.The bottom hole pressure's reducing formula that predecessors had used cannot meet production's need.In view of the above situation,according to the pumping data developed from production of Daqing Oil Field,we predict that there is fluid column at the bottom of gas production well with water when the well is shut in.According to the flow behavior of gas and water in the bore hole,we finally confirm the fact that fluid column exists,and derive a formula for calculating the height of fluid column.We also arry on the suitable merge Cullender and Smith's bottom hole pressure formulation and pressure intensity caused by fluid column,finally obtain the suitable method for calculating the bottom hole pressure of deep gas well computation suitable method.The improved formula has been tested on Well Xushen-7's KYC107Ⅰlayer,and convert accuracy degrees are all smaller than 1 MPa.The result can conform to the actual production need.