Testing device for detecting pressure distribution in hole by simulating hydra-jet fracturing under actual working conditions

Abstract

The invention relates to a testing device for detecting pressure distribution in a hole by simulating hydra-jet fracturing under actual working conditions. The testing device comprises a supporting pipe body and a testing piece, wherein a through hole is formed in the testing piece axially, and the testing piece is fixed in the supporting pipe body; one end of the testing piece is sealed, the other end of the testing piece is provided with a jet plate, and a through hole in the jet plate corresponds to the through hole in the testing piece; a liquid charging pipe stretches into the supporting pipe body, and a nozzle is arranged at the front end of the liquid charging pipe and corresponds to the through hole in the jet plate; and a plurality of pressure testing joints which can be connected with a pressure testing device are arranged outside the testing piece axially, and the pressure testing joints are communicated with the through hole in the testing piece so as to detect the axial pressure change in the through hole. By the testing device, the condition that pressure in simulation perforations changes along with an axial position can be detected, so that reliable testing data are provided for a research on a hydra-jet fracturing mechanism, and theoretical and experimental bases are provided for a process design of on-site construction.

Description

technical field [0001] The present invention relates to an experimental device, in particular to an experimental device for detecting and simulating the pressure distribution in a hydraulic jet fracturing hole. Through the experimental device, the pressure distribution in the formation hole during high-speed jet injection can be truly simulated, and a reliable Experimental data. Background technique [0002] In 1947, the hydraulic fracturing stimulation technology was first implemented in a vertical well in the HUGOTON gas field in the southwest of KANSAS in the United States. After nearly half a century of development, especially since the late 1980s, in fracturing design, fracturing fluid And additives, proppants, fracturing equipment and monitoring instruments, and fracture monitoring have all achieved rapid development, making hydraulic fracturing technology widely used in fracture height control technology, high-permeability sand control fracturing, repeated fracturing,...

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Problems solved by technology

[0005] Chinese patent application No. 200510072121.8 discloses a "horizontal well fracturing method". The main defect of this method is that it cannot control the fracture initiation position in the horizontal well section and cannot realize staged fracturing

[0007] In the current known technology, the research on hydraulic jet fracturing method and downhole tool structure is relatively sufficient, but there is no report on the experimental device for the study of hydraulic jet fracturing mechanism.

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