An Experimental Method for Simulating Injection-production Plane Contradiction in a Well Group

Abstract

The invention relates to an experimental method for simulating an injection production plane conflict in a well group. The experimental method comprises three main steps of experimental sand preparation, physical model device preparation and plane conflict simulation. The plane conflict simulation stage comprises the following steps that a whole device is in a water saturated state; oil production wells in the other directions are closed, only an injection well and a production well are opened, hot water is introduced, special temperature-sensitive materials in the direction are corroded, and a certain corrosion time is set in each direction according to the effect ratio of the actually-simulated plane conflict in each water injection direction; and all the oil production wells are opened, water is introduced, the water injection effect situation in each direction after corrosion treatment is verified, and corrosion can be repeated if a deviation exists till a satisfactory effect is achieved. According to the experimental method for simulating the injection production plane conflict in the well group, a highly permeable strip and a large pore path formed by injected water erosion can be rapidly established in a room, and simulation of the different water injection effect situations in the different directions in a single well group or multiple well groups is achieved.

Description

technical field [0001] The invention belongs to the field of oil and gas field development, and in particular relates to a physical modeling method for oil well collection. Background technique [0002] At present, most oilfields in China use water flooding as the main development method. After long-term water injection in these oilfields, the primary and secondary heterogeneity of the reservoir is more prominent, which is specifically manifested in some relatively high-permeability layers in the vertical direction. The problem of water channeling is becoming more and more serious. The local high permeability area in the reservoir forms a dominant channel for water injection. The direction of water flooding on the injection-production plane is obvious, and the swept volume of water flooding is gradually fixed or reduced. Profile control technology is an effective means to solve interlayer, intralayer, and plane conflicts, realize vertical and plane liquid flow diversion, and...

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Problems solved by technology

However, there are few physical modeling instruments for the simulation of plane contradictions and the evaluation of the overall profile control laboratory. Realize the dewatering intensity of the injected water in different directions (that is, the water injection level is contradictory). The defect of this scheme is that the simulated water flooding directions are only connected at the wellbore of the water injection well, and are not connected at other places, so it cannot be simulated Real planar injection-production contradiction between well groups exploited in the same layer; 2. Glass etched plate model, which mainly uses laser to etch the permeability difference or large pore distribution of water injection wells in different directions on the glass plate, so as to realize injection The main advantage of the simulation of mining plane contradiction and post-stage profile control is visualization, but the disadvantage is that the device is not pressure-resistant, and the simulated environment is quite different from the real reservoir situation; 3. The three-dimensional physical model, which can be customized in advance The heterogeneous core or the artificial sand filling method can be directly used to achieve the plane contradiction, but both of them are made in advance with different permeability areas or large pores, which are different from the real water erosion pores, and the physical model cannot simulate Dewatering strength in multiple different directions (that is, more complex plane contradictions)

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