Swabbing device for well logging of rod pumped well and well logging method based on device

Abstract

The invention aims to provide a well logging device which is suitable for well logging of the fluid producing profile of a rod pumped well. The well logging device comprises a pump body and a variable-diameter piston body, wherein a joint which is used for connecting an oil pipe is arranged on the lower end of the pump body, a fluid inlet and a fluid outlet with check valves are formed in the pump body, the variable-diameter piston body is arranged in the pump body, and a coupling which is used for connecting the oil pipe with a well logging instrument is arranged on the upper end of the variable-diameter piston body. The invention further discloses a well logging method based on the device. The well logging method comprises a series of steps of installing the device and pipe columns, setting a packer after the installed device and the pipe columns are lowered to a preset depth, disconnecting, swabbing and logging a well. According to the well logging device and the well logging method, a continuous swabbing test process of a small-diameter test instrument through a swabbing pump plunger is realized, the problem that an annulus test on the fluid producing profile of an oil well cannot be adopted is solved, and additionally, the well logging device and the well logging method can be used for exploring water in a low-inclination well.

Description

technical field [0001] The invention relates to downhole equipment for oil wells, and belongs to the technical field of testing devices for fluid production profiles of oilfield production wells, in particular to a pumping device suitable for use in the measurement of fluid production profiles of pumping wells and a new well logging method based on the device. Background technique [0002] After the oilfield enters the mid-to-late development stage with medium and high water cut, the oil wells are mainly pumping wells. The liquid production profile of the pumping wells is measured and relevant data are obtained. At the same time, a reasonable plan, Production increase measures and working system provide accurate and reliable analysis basis for fine and efficient development and analysis of oilfields. [0003] The existing liquid production profile logging technology and defects of pumping wells are mainly as follows: [0004] 1. Annulus delamination testing technology: The ...

AI Technical Summary

Problems solved by technology

[0009] In order to solve the above-mentioned problems in the prior art, the object of the present invention is to provide a swabbing device suitable for logging the fluid production profile of a pumping well, and provide a logging method based on the device at the same time, so as to realize that the device can be After the pipe string is lowered to the designed position, the packer is set in sequence, the anchoring slips are anchored, and the pipe string is disconnected. The pipe string is driven to reciprocate up and down by the drilling machine to simulate the pumping of the kowtow machine well. A small-diameter flow rate water-bearing logging instrument is lowered into the tubing string to the production zone for layered testing, thereby overcoming the problems of low success rate, low instrument requirements, and high cost of the existing pumping wells’ fluid production profile logging technology

Images