Mechanical water plugging pipe column for multi-point discharge of cased hole completion multi-section fractured horizontal well and method

Abstract

The invention discloses a mechanical plug pipe column for multi-point discharge of a cased hole completion multi-section fractured horizontal well and a water plugging method. The water plugging pipe column comprises a pipe plug and a Y445-type releasing packer, wherein at least three Y441-type packers are arranged between the pipe plug and the Y445-type releasing packer at intervals; sealed oil layer packing sections and water outlet layer packing sections are formed between two adjacent Y441-type packers and the inner wall of a horizontal well sleeve; a security joint and a control switch are orderly connected between the two Y441-type packers on each oil layer packing section through oil pipes in series; the security joint is serially connected between the two Y441-type packers on each water outlet layer packing section through the oil pipe; and the oil layer packing sections and the water outlet layer packing sections are connected in series through the oil pipes. According to the mechanical plug pipe column for multi-point discharge of the cased hole completion multi-section fractured horizontal well and the water plugging method, a plurality of Y441-type packers are adopted to be in multi-stage combination with the control switch, so that effective plugging of multi-point discharge of the multi-section fractured horizontal well or any point discharge is achieved; effective production of a major reservoir section is achieved, and the effects of controlling water and increasing oil are achieved.

Description

technical field [0001] The invention relates to a water plugging string and a water plugging method in the technical field of oil production in oil fields, in particular to a mechanical water plugging string and a water plugging method for multi-point water outlet of a multi-stage fracturing horizontal well with casing completion. Background technique [0002] In the field of petroleum exploitation, due to the complex and changeable wellbore trajectory of the horizontal well itself, the injection-production well pattern, and the different lithology, physical properties, and reservoir fluid properties of each oil layer, it is easy to cause multiple points of water production after the horizontal well is put into production, affecting Horizontal well development effect. In order to better exploit the development potential of horizontal wells, petroleum workers at home and abroad have carried out research on the water shutoff technology of horizontal wells; Water technology is...

AI Technical Summary

Problems solved by technology

Among them, the "fishable and drillable horizontal well water plugging process string" can only achieve two-stage sealing, that is, it can only be applied to the plugging of single-point water outlet, and cannot realize the plugging of multi-point water outlet; Annulus chemical packer material" is applied to screen completion horizontal wells; "51 / 2" casing perforation completion horizontal well mechanical layered composite pipe string for finding plugging water" is an integrated string for plugging detection, That is to say, the water plugging string is connected with the production string, and the peristalsis of the string during the production process will easily cause the failure of the packer, and the validity period of the water plugging will be short. At the same time, the pressure control switch is used, which will easily cause pressure confusion when pressing, and easily lead to the failure of the water plugging

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