Radial well fracture testing device

Abstract

The invention relates to a radial well fracture testing device. The radial well fracture testing device comprises a pumping unit, a transparent wellbore hole simulator, a stratum simulation pipeline and a transversely-cut seam simulation device. The pumping unit is used for pumping sand-carrying fluid. The inlet of the transparent wellbore hole simulator is connected with the outlet of the pumping unit, and the transparent wellbore hole simulator is used for allowing a user to observe the sand setting rule. The inlet of the stratum simulation pipeline is connected with the outlet of the transparent wellbore hole simulator, and the stratum simulation pipeline is used for simulating and testing radial wellhole or tubular column friction drag under different reservoir stratum conditions. The inlet of the transversely-cut seam simulation device is connected with the outlet of the stratum simulation pipeline, and the transversely-cut seam simulation device is used for simulating and testing the propping agent setting rule of a transversely-cut seam formed by fracture of a radial well. The sand-carrying fluid can be used when the friction drag of the radial well is tested, the roughness of the wall of the well and the leak-off process of fracturing fluid are simulated, and accuracy and practicability of a friction drag test are improved; meanwhile, the sand setting rule can be observed through the transparent wellbore hole simulator and the propping agent setting rule of the transversely-cut seam under the leak-off condition can be tested through the transversely-cut seam simulation device.

Description

technical field [0001] The invention relates to the field of petroleum engineering, in particular to a radial well fracturing testing device. Background technique [0002] Radial well refers to a horizontal well whose curvature radius is much shorter than that of conventional drilling. Through high-pressure hydraulic jet drilling, the borehole diameter can be 2-5cm and the length can reach 80-150m. Radial wells are suitable for the development of low-permeability oil layers, thin oil layers, fractured oil and gas layers, "dead oil zones" after water injection, lithologic trap reservoirs, and exploration wells with poor fracturing effects or severely polluted / blocked near-wellbore areas. development well. However, in low-permeability oil and gas reservoirs, only a few radial boreholes are used to communicate, the oil drainage area is insufficient, and the increase in oil and gas production is not obvious. It is necessary to use stimulation methods to increase the productivit...

AI Technical Summary

Problems solved by technology

[0005] In the prior art, there is no friction test device specifically for radial wells, and most of them measure a single liquid. Due to the use of sand-carrying fluid in the fracturing process of radial wells, the accuracy and practicability of measuring the friction of a single liquid are low.

In addition, the existing devices do not have the function of changing diameter and curves, and cannot better simulate the formation conditions; the existing technology does not have a transparent wellbore, and cannot observe the shape of the fluid inlet channel and the law of sand settling; The cross-cut slit simulation device of the hole cannot simulate the proppant settlement law in the cross-cut slit under the condition of fluid loss test

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