Method for detecting water outflow layer and water incoming direction of oil well by using radioactive hydrophilic particles

Abstract

The invention discloses a method for detecting a water outflow layer and a water incoming direction of an oil well by using radioactive hydrophilic particles. The method comprises the following stepsthat a detection solution is mixed in a water injection exploitation process of a water injection well for reservoir oil displacement production, wherein the detection solution comprises the radioactive hydrophilic particles; if the condition of oil well water outflow occurs in the production process, specific radioactivity around a shaft is measured; and detection cloud charts of the water outflow layer and the water incoming direction of the oil well are drawn according to the radioactivity measurement result, and the well depth position of the water outflow layer and the water incoming direction are judged. The method is simple, convenient, feasible, low in cost, accurate and reliable, and can help oil field workers to accurately master the position of the water outflow layer of the oilwell and the water incoming direction, so that targeted profile control and water plugging measures are taken, the water injection development effect is improved, and the crude oil recovery ratio isincreased.

Description

technical field [0001] The invention belongs to the field of petroleum engineering, and in particular relates to a method for detecting the water outlet layer of an oil well and the orientation of incoming water by using radioactive hydrophilic particles during the water injection development process of an oil field. Background technique [0002] After the oil field is put into development, with the increase of production time, the energy of the oil layer itself will be continuously consumed, resulting in a continuous drop in the pressure of the oil layer, the production of the oil well will be greatly reduced or even stop the injection and production, resulting in a large amount of remaining underground oil that cannot be recovered. Most oilfields in my country are low-porosity and low-permeability reservoirs, and the natural energy of most oilfields is not sufficient. In order to maintain the reservoir pressure and increase the recovery, water injection is usually used for ...

AI Technical Summary

Problems solved by technology

However, there are two problems with this type of method. One is that the operation procedure is complicated, and corresponding devices and tools need to be equipped at the same time, which increases the implementation cost; the other is that it can only determine the water outlet level but cannot determine the direction of the incoming water and the water outlet. Usually, full-layer mechanical isolation is performed. , the production capacity of the water-producing oil layer has not been brought into play

Images