Tracing flow polymer-injected profile logging device, tracing agent and confection device and logging method

Abstract

The invention discloses a tracer flow polymer injection profile well logging instrument, a tracer, a tracer makeup device and a well logging method. The well logging instrument comprises a remote-sensing nipple equipped with a collar locator CCL, a tracer sprayer equipped with a continuously rotating motor, and a gamma-ray probe equipped with a near probe and a far probe. The tracer makeup device comprises a control box and a makeup box. The makeup box, which is equipped with a lead glass screen and a lead plate, is arranged on the control box. The bottom of the makeup box is equipped with a guide rail and a protection plate. A stirrer and a funnel are arranged above the guide rail. The stirrer is connected with a weight dropper. 4.5 to 3.5 weight shares of solid polymer, 4.5 to 3.5 weight shares of guar gum, and 2.5 to 1.5 weight shares of amylum are mixed with a tracer suspension to make a liquid with the concentration of 2000mg per litter, and then the liquid together with the 0.5mCi 131Ba micro-spherical tracer to make a suspension. The tracer flow well logging method and the isotope tracer water-injection profile well logging method are used for the well logging. The tracer suspension is first evenly sprayed continuously and then is sprayed in a spotting way. The tracer suspension of the invention is even, and is provided with a low lower limit and a high precision. Moreover, the well logging instrument of the invention is low in the cost.

Description

technical field [0001] The invention relates to the technical field of petroleum and natural gas exploitation, in particular to the technical field of measuring polymer injection in injection wells. Background technique [0002] With decades of development of the oil and gas industry, the remaining recoverable reserves of oil fields have been decreasing year by year after years of water injection development. In order to control the rise of water cut and stabilize crude oil production, measures such as polymer injection in injection wells have been taken. Polymer injection in Daqing and other oilfields has become the main measure to enhance recovery and stabilize production. The logging of polymer profile (how much polymer is injected in each layer and the percentage of the total injection in the well) has become an urgent problem to be solved. Although some people have used the mature radioisotope tracer water injection profile logging technology in polymer profile logging...

AI Technical Summary

Problems solved by technology

However, a new problem is encountered, that is, in the well where the polymer is injected, because the viscosity of the polymer is much higher than that of water, the 131 When the Ba microsphere tracer is released, it clusters and piles up, and the one-time released tracer cannot evenly enter each small layer, so that accurate polymer injection profile data that conforms to the downhole situation cannot be obtained

Tracer flow logging (also known as correlation flow logging) in water injection wells can only measure the polymer injection profile of the layered section, and the polymer injection profile of the sub-layers cannot be measured.

Images