Multistage fracturing and exploitation control method

Abstract

The invention provides a multistage fracturing and exploitation control method. Switch sliding sleeves are arranged on n production layers in the pit respectively, every two adjacent switch sliding sleeves are connected through a packer, and the switch sliding sleeve at topmost end is connected to a well completion pipe sleeve through one packer. When operation needs to be conducted on a certain production layer, the switch sliding sleeve on the production layer is opened, and the sliding sleeve is closed after the operation is completed. Through the multistage fracturing and exploitation control method, production increase operation or exploitation control of the corresponding production layers can be achieved, interaction between all the layer segments can be effectively avoided, productivity of all the layer segments is maximized, the service life of a borehole is prolonged, and well drilling cost is reduced.

Description

technical field [0001] The invention relates to the technical field of drilling, in particular to a multi-stage fracturing and production control method. Background technique [0002] Oil and gas reservoir mining methods at home and abroad mainly include open hole mining, liner perforating mining, and screen + open hole packer mining. The common defect of these mining methods is that they cannot be controlled and operated in sections. Means such as plugs and packers are barely segmented, and the layers always affect each other, and they are all one-off. There is no means to control the production again in the later stage. Once a problem occurs in a certain layer, it usually leads to the failure of the entire well. scrapped, resulting in heavy losses. In addition, especially for oil and gas wells with many production layers, different pressures of each production layer, uncertain productivity, different production cycles, and complex oil and gas reservoirs with their own sep...

AI Technical Summary

Problems solved by technology

[0003] The existing staged fracturing technologies both at home and abroad can only be used for one-time fracturing step by step, and after fracturing, all layers can be exploited together. The disadvantage is that the one-time operation cannot be repeated. Once there is a problem in a certain section due to fracturing and re-completion, it will seriously affect the overall production of the well, and even cause the well to be scrapped and unable to increase production for a long time

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