Vertical well orientated hydraulic jet multi-stage fracturing method for oil and gas well

Abstract

The invention discloses a vertical well orientated hydraulic jet multi-stage fracturing method for an oil and gas well. The method includes the following steps of well flushing, well killing and drifting scrapping. A guiding head, a rotatable casing collar locator, a repeatable-setting packer, an oriented hydraulic jet gun, a safety joint, an oriented pup joint and an oil tube oriented hydraulic jet multi-stage fracturing string are sequentially connected to the tail end of an oil tube; after the string enters the well, the position of the jetting tool is localized accurately through the rotatable casing collar locator; the string is rotated at the mouth of the well to determine the orientation corresponding to a spray nozzle of the oriented hydraulic jet gun; after orientation is determined, setting of the repeatable-setting packer is performed, perforating fluid enters from an oil tube pump to perform sand blasting perforation, and oil jacket annular space sand fracturing is performed; after fracturing construction is ended, the oil tube is lifted to unpack the repeatable-setting packer. With the method, the operation period is short, the demand that during fracturing, crack initiation is performed in the minimum main stress direction can be met, construction pressure is decreased, and the recovery efficiency of the oil and gas well is substantially improved.

Description

technical field [0001] The present invention relates to the field of oil drilling, in particular to a multi-stage fracturing method of directional hydraulic injection for oil and gas well vertical wells, which is suitable for casing completion of oil and gas wells, and is suitable for unconventional oil and gas reservoirs such as tight sandstone gas, shale gas, and coalbed methane. effective means of increasing production. Background technique [0002] The commonly used hydraulic sandblasting perforation method in oil and gas fields is mainly spiral perforation. Due to the randomness of the sandblasting perforation direction, the perforation may not coincide with the ideal orientation, resulting in complex fractures such as steering fractures and multiple fractures, which is not conducive to reservoir formation. remodel. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a multi-stage fracturing method of direction...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a multi-stage fracturing method of directional hydraulic injection for oil and gas well vertical wells, accurately locate the perforation position before perforation, adjust the perforation angle, and align it with the most favorable perforation orientation. During fracturing, it can effectively reduce formation fracture pressure and near-wellbore effect during fracturing of oil and gas wells, form a wide flat fracture in the reservoir, and solve the problems of low perforation efficiency and large bending friction of conventional hydraulic sand blasting perforation Problems, reduce formation fracture pressure, improve oil and gas well fracturing effect

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