Abradant jet downhole perforation, and kerf multiple fracturing method

Abstract

The invention relates to a method for abrasive material shooting flow underground perforation and kerf multiple fracturing and a device thereof. The method includes the following steps: 1. an abrasive material shooting flow ejector device is led into an appointed layer in the well through an oil pipe; 2. pressurized perforation fluid is supplied for the abrasive material shooting flow ejector device through the oil pipe, the injection nozzle of the ejector device is used for injecting the perforation fluid into the side wall of the sleeve pipe and the stratum at a high speed, and eyelets are formed in the stratum; 3. fracturing fluid is pumped into the eyelets so as to form fracturing cracks in the stratum in the eyelets; and 4. after one layer is fractured, the abrasive material shootingflow ejector device is moved into another appointed layer, and the three steps from 1 to 3 are repeated. The abrasive material shooting flow ejector device is provided with an ejection gun for injecting abrasive material shooting flows, wherein, at least two injecting nozzles are arranged on the ejection gun; and the ejection gun is connected with the oil pipe. The method and the device overcome the disadvantages of the commonly known technology, combines the abrasive material shooting flow pore-forming with the fracturing, and can carry out the comparatively precise operation of layered fracturing in a vertical shaft section fracturing in a horizontal shaft section.

Description

technical field [0001] The present invention relates to a method for staged fracturing in vertical wells or staged fracturing in horizontal wells, in particular to a method for downhole perforation and slotted staged fracturing using abrasive jets. The invention is especially suitable for the fields of oil and natural gas exploitation. Background technique [0002] In 1947, hydraulic fracturing stimulation technology was first implemented in a vertical well in the HUGOTON gas field in the southwest of KANSAS, USA. Rapid development of hydraulic fracturing technology, additives, proppants, fracturing equipment and monitoring instruments, and fracture monitoring have made hydraulic fracturing technology useful in fracture height control technology, sand control fracturing in high-permeability layers, refracturing, deep penetration fracturing, etc. New breakthroughs have been made in fracturing and multi-stage fracturing with large sand volume. At present, hydraulic fracturin...

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Problems solved by technology

[0004] 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

In addition, it is difficult to operate on-site construction by analyzing the frictional resistance of the holes and judging the number of liquid inlet holes through the step-down discharge, which leads to inaccurate amounts of temporary plugging agents and cannot effectively plug the cracks that have been opened; Otherwise, the working reliability of the plugging agent will also seriously affect the plugging effect on the fractures that have been opened.

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