Radial hydrojet perforation string with pre-tooled

Abstract

The invention discloses a radial hydraulic spraying perforating pipe column for a preset tool. A pipe column body is divided into three interrelated inner and outer layers, the outer layer pipe columnincludes a hanger and a positioning rail pipe, a preset rail is formed in the inner wall of the positioning rail pipe, and a plurality of horizontal preset holes are formed in the side wall of the positioning rail pipe in the length direction of the positioning rail pipe at different heights; the middle layer pipe column includes oil pipes, a guiding device and a positioning pin, the guiding device is internally provided with a steering groove, an inlet of the steering groove is in the vertical direction, an outlet of the steering groove is in the horizontal direction, the positioning pin isinternally installed on the guiding device, a limiting device matched with the positioning pin is designed on a positioning rail, the positioning pin reaches the limiting device of the positioning rail pipe, and the middle layer pipe column reaches the lowest end of the positioning rail pipe; and the inner layer pipe column includes a high-pressure hose and a nozzle, the high-pressure hose passesthrough the oil pipes and the steering groove in the guiding device to make the nozzle passes through the outlet of the steering groove and penetrates out of the preset holes to spray. Ground equipment is simple, drilling construction operation is convenient, the drilling rate is high, the well construction period is short, and the economic benefit is remarkable.

Description

technical field [0001] The invention relates to the field of well completion engineering of unconventional oil and gas reservoirs such as petroleum and natural gas, in particular to a radial hydraulic jet perforating string with preset tools. Background technique [0002] Pre-tooled radial hydrojet perforation can be used in single reservoirs with low permeability, or in reservoirs where multiple sublayers exist. Use the hanger to hang the positioning track pipe at the designed position, and use high-pressure water jet instead of the mechanical drill bit to break the rock and drill the horizontal wellbore; drilling does not require the rotation of the drill string and the drill bit, which reduces the occurrence of complex accidents downhole; relying on hydrostatic pressure Propulsion does not need to apply “weight-on-bit” to the drill bit to break the rock through the drill pipe, thus completely solving the difficulty in applying pressure on bit encountered in conventional h...

AI Technical Summary

Problems solved by technology

The positioning of the string in this process is difficult, and the injection string cannot be accurately inserted into the oil layer, and only a single reservoir can be exploited

The construction cost of the pipe string using this technology is high, the mining layer is single, and the construction benefit and economic benefit are low

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