Packer packing multi-layer hydropower abrasive perforating and fracturing integrated technique

A process method and technology of hydraulic ejector are applied in the fields of multi-layer perforation and fracturing of oil and gas wells, which can solve the problems of large physical property difference, leakage, and insufficient fracturing of the upper layer, so as to achieve convenient and simple construction, short cycle effect

Inactive Publication Date: 2008-09-24
PETROCHINA CO LTD
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Problems solved by technology

[0002] For oil and gas wells with multiple layers in one well, due to the large difference in physical properties and strong heterogeneity among the reservoirs, when hydraulic sand blasting technology is used for layered fracturing, after the fracturing of the lower layer is completed, the pipe string is lifted , when fracturing the upper layer, if the fracture pressure of the upper layer is higher than that of the lower layer, the fracturing fluid entering the upper layer may “leak” into the lower layer. On the one hand, the upper layer cannot be fully fractured; "has been reformed, resulting in the failure of effective reformation of the upper and lower layers, seriously affecting the production of oil and gas wells

Method used

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  • Packer packing multi-layer hydropower abrasive perforating and fracturing integrated technique

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Embodiment 1

[0021] Embodiment 1: Taking an oil well with upper and lower oil layers as an example, the integrated process of hydraulic sand blasting perforation and fracturing with a packer for sealing multiple layers is described in detail.

[0022] For example, in a directional oil well, there are two different types of sandstone reservoirs at the upper and lower layers, the interval between layers is 20m, the fracture pressure of the upper formation is 38MPa, and the reservoir is dense and the fracture pressure is high; the fracture pressure of the lower formation is 30MPa, and the reservoir fracture pressure is relatively low.

[0023] refer to figure 1 . The process string is composed from top to bottom: oil pipe 1, safety joint 2, hydraulic injector 3, K344 packer 4, check valve 5, screen pipe 6, and plug 7. The nozzle aperture of the water jet 3 is 6 millimeters, and the number of nozzles is 6. The arrangement relationship of the nozzles is a symmetrical arrangement, and the uppe...

Embodiment 2

[0031] Embodiment 2: It is basically the same as Embodiment 1, except that the packer used is the Y344 packer. Another difference is the nozzle, the nozzle aperture is 5 mm; the number of nozzles is 16; the arrangement of the nozzles is symmetrically distributed, and the 16 nozzles are divided into 4 rows, and each row is distributed in a spiral form from bottom to top.

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Abstract

An integrative method for a packer to pack off a multi-layer hydraulic sand-spraying perforation and pressure fracture is used in the multi-layer perforation and the pressure fracture of a well of well completion of a petroleum casing. A pipe column comprises an oil pipe, a safety joint, a hydraulic ejector, a K34 or a Y34 packer, a uniflow valve, a sieve vessel and an end cap, wherein, the lower layer of a hydraulic ejector position requires perforation depth. With the completion of perforation, the hydraulic sand-spraying fractures the lower layer by actively circulating the lower layer of the hydraulic sand-spraying perforation. When the hydraulic sand-spraying pressure fracture for the lower layer is completed, a reverse circulation surge tank is processed and the pipe column is leveled up and dragged to the upper layer of perforation pressure fracture to continue to fracture the upper layer by hydraulic sand-spraying perforation. After completion, the pipe column is lifted to be put into the well-completion pipe column to discharge liquid and finish production. The perforation is not required by each layer because only an oil pipe needs to be dragged to finish the multiple fracturing of multiple layers of the well. The integrative method integrating the perforation, the fracture and the packing-off together is new stimulation treatment technology. In addition, the fracture is reliable, construction is easy and convenient and period is short.

Description

technical field [0001] The invention discloses a novel packer used in the petroleum industry to seal off multi-layer hydraulic sand blasting perforation and fracturing integrated process method, which is suitable for multi-layer perforation and fracturing reconstruction of oil and gas wells in casing completion mode. Background technique [0002] For oil and gas wells with multiple layers in one well, due to the large difference in physical properties and strong heterogeneity among the reservoirs, when hydraulic sand blasting technology is used for layered fracturing, after the fracturing of the lower layer is completed, the pipe string is lifted , when fracturing the upper layer, if the fracture pressure of the upper layer is higher than that of the lower layer, the fracturing fluid that entered the upper layer may "leak" into the lower layer. On the one hand, the upper layer cannot be fully fractured; "has been reformed, resulting in the failure of effective reformation of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/00E21B43/114E21B43/267
Inventor 王道富周宗强徐永高赵振峰付钢旦李宪文赵粉霞桂捷
Owner PETROCHINA CO LTD
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