Test device and method for simulating acid etching crack flow guide capability

Abstract

The invention relates to a test device and a method for simulating acid etching crack flow guide capability. The test device consists of a liquid storage tank, a diaphragm pump, a pipeline electric heating sleeve, a flow meter, a flat plate clamping device, a pressure return valve, a condensing pipe, a waste liquid tank, a data collection and control panel and the like, wherein the inner side of the clamping device is provided with a temperature sensor and a pressure sensor, both ends of the lamping device are provided with small liquid inlet holes and small liquid outlet holes, the inside of the clamping device is provided with a liquid inlet piston and a liquid outlet piston, a rock core chamber is arranged between the liquid inlet piston and the liquid outlet piston, the clamping device is connected with a pressure machine, and the diaphragm pump, the pipeline electric heating sleeve, the flow meter, the temperature sensor and the pressure sensor are all connected with the data collection and control panel and a computer. The test method comprises the following steps; cutting the rock into rock core samples conforming to the standard flow guide chamber, and sealing and curing the rock core samples; placing the rock core samples into the rock core chamber; adopting a gasket for simulating the crack width; sequentially opening a clear water storage tank and an acid liquid storage tank; starting the computer, and inputting experiment parameters; and calculating the flow guide capability of the acid etching cracks of the rock core samples. The invention can simulate the real conditions of the underground acid etching crack forms, and can meet the requirements of the acid etching crack flow guide capability test under different environment conditions.

Description

technical field [0001] The invention relates to a test device and method for simulating the conductivity of acid-etched fractures in the development process of oil and gas fields. Background technique [0002] Fracturing and acidizing (acid fracturing) is an effective measure to increase oil and gas well production and ultimate recovery. It uses acid liquid to etch the artificial or natural fracture surface non-uniformly. When the fracture is closed, due to the groove or unevenness of the fracture wall, it still has a certain acid-etched fracture conductivity, thereby improving the seepage status of oil and gas wells. , to increase production of oil and gas wells. Fracture conductivity is one of the key factors affecting the effect of acid fracturing. The dissolution amount and dissolution mode of the rock on the fracture surface are the two main factors affecting the acid erosion conductivity, which are mainly related to the physical properties of the formation rock, rock...

AI Technical Summary

Problems solved by technology

[0008] (1) The indoor simulation parameters are not determined according to the principle of similarity

[0009] (2) By changing the thickness of the rock sample to simulate the change of the fracture width, the fracture width cannot be adjusted automatically

[0010] (3) The influence of acid fluid loss on the conductivity of acid-etched fractures cannot be simulated

[0011] (4) The plate holder adopts self-sealing or interactive sealing between the holder and the rock sample to seal the rock sample, which may easily cause the acid liquid to leak from the side of the rock sample

[0012] (5) The size of the rock sample is too long (generally 18-40cm). In most cases, the actual coring cannot meet the size requirement, and only the outcrop can be used for simulation. The test results cannot fully represent the actual reservoir conditions.

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