SURVEYING METHOD OF HORIZONTAL WELL Russian patent published in 2014 - IPC E21B47/00 

FIELD: oil and gas industry.

SUBSTANCE: method envisages running-in of the flow string to the well and injection of the working fluid to pipes with measurement of its flow rate and an injection pressure at the well head. Before running-in the flow string is equipped with a multi-set packer with a liner and at running-in of the flow string the packer is set over the roof of the first production interval in the direction of the horizontal well (HW) drilling. The injection pressure for the working fluid is recorded at the well head when it stabilises, then the parker is broken and the flow string is run in further and the parker is set over the roof of the next production interval in the direction of the HW drilling. Then the working fluid is injected again. When the well-head injection pressure stabilises it is maintained equal to the injection pressure for the previous survey and the flow rate of the working fluid is recorded; at that breaking of the packer, running-in of the flow string, setting of the packer over roofs production intervals is repeated several times depending on quantity of production intervals in the horizontal well. At that the injection pressure of the working fluid during each survey is maintained constant and equal to the injection pressure recorded at the first packer setting over the roof of the first production interval in the direction of the HW drilling, then on the basis of recorded flow rate of the working fluid it is necessary to calculate quantity of the fluid absorbed by each production interval per time unit.

EFFECT: receipt of accurate data to issue a quantitative injectivity profile for hot horizontal wells.

2 cl, 1 ex, 3 dwg