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Drilling-plug-free pumping-in hydraulic bridge plug staged fracturing method

A technology of staged fracturing and no drilling plug, which is applied in pump-in hydraulic bridge plug staged fracturing, horizontal well volume fracturing stimulation technology in low permeability and tight reservoirs, and horizontal well volume fracturing stimulation field, which can solve the problem. The problem of high operating costs can achieve the effect of reducing labor intensity, high construction efficiency, and reducing the frequent tripping of the pipe string and the time of blowing.

Inactive Publication Date: 2015-04-29
PETROCHINA CO LTD
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AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problem of high operating costs that require the use of coiled tubing equipment to drill and grind bridge plugs in the prior art

Method used

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Embodiment Construction

[0026] In order to solve the problem of high operating costs due to the need to use coiled tubing equipment to drill and grind bridge plugs in the prior art. This embodiment provides a drilling plug-free pump-in hydraulic bridge plug staged fracturing method, including the following steps:

[0027] Step 1) Drilling the well: Use the drilling gauge to drill the well to the bottom of the artificial well to ensure that the shaft is clean;

[0028] Step 2) The first stage of perforation and fracturing: use tubing to carry out the first stage of perforation, pull out the perforating gun, and perform bare casing fracturing on the first stage without blowout, and shut down the well;

[0029] Step 3) Lower the enlarged bore bridge plug and perforation tool string:

[0030] The large-diameter bridge plug and perforation tool string are run in the cable operation. After reaching the 30° well deviation, the large-diameter bridge plug and perforation tool string are pumped to the predete...

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Abstract

The invention belongs to the technical field of oil production engineering, and particularly relates to a drilling-plug-free pumping-in hydraulic bridge plug staged fracturing method. The method comprises the following steps of (1) drifting; (2) first-stage perforation and fracturing; (3) large-drift-diameter bridge plug and perforation tool string pumping; (4) ground ignition setting on a large-drift-diameter bridge plug; (5) gradual and upward lifting of cables according to the second-stage perforation section position, and grading ignition perforation; (6) perforation tool string pulling out; (7) fracturing; (8) repeated and sequential bridge plug installation, perforation and ball fracturing on the rest layer sections until the completion of all layer section fracturing operation; (9) soluble ball dissolution (at the moment, the drift diameter of a pitshaft is identical to that of a center pipe of the bridge plug); (10) open flow, finding production and well completion. The method provided by the invention has the characteristics that the packing is reliable, the partial pressure stage number is not limited, the grading perforation positioning is accurate, the bridge plug drilling and grinding is not needed, the construction efficiency is high, the cost is low, and the goal of staged fracturing of a horizontal well can be achieved.

Description

technical field [0001] The invention belongs to the technical field of oil production engineering, and in particular relates to a drilling plug-free pump-in hydraulic bridge plug staged fracturing method, relates to a volumetric fracturing reconstruction process for horizontal wells in low-permeability and tight reservoirs, and is suitable for casing well completion Volumetric fracturing of horizontal wells. Background technique [0002] In recent years, conventional fracturing bridge plugs have been widely used in layered fracturing of oil and gas wells. Horizontal well stimulation in oil and gas fields mainly includes hydraulic jet staged fracturing, open hole packer staged fracturing, and hydraulic bridge plugs. [0003] The hydraulic bridge plug technology has the characteristics of reliable isolation, light casing fracturing, unlimited fracturing stages and high efficiency of continuous hot work. The tool string is sent to the predetermined position, multi-cluster perf...

Claims

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Application Information

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IPC IPC(8): E21B43/26E21B23/00
CPCE21B43/261E21B33/12
Inventor 徐创朝慕立俊赵振峰李宪文郭小勇吴顺林王广涛江智强王蓓刘汉斌
Owner PETROCHINA CO LTD
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