Packer for complicated small pit shaft and setting method thereof

Abstract

The invention provides a packer for a complicated small pit shaft and a setting method thereof. The packer comprises a center pipe, an upper connector, a lower connector and a rubber tube, wherein a pressure transfer hole is formed in the center pipe; the first end of the upper connector is connected with the first end of the enter pipe; the first end of the lower connector is connected with the second end of the center pipe; the rubber tube sleeves the center pipe; one end of the rubber tube is connected with the first end of the upper connector through an upper rubber tube seat; and the other end of the rubber tube is connected with the first end of the lower connector through a lower rubber tube seat. The packer for the complicated small pit shaft provided by the invention has the advantages that the structure is simple; the setting method is simple; and the requirement of multi-stage segmented well completion in a complicated small well of a compact gas reservoir horizontal well can be met.

Description

technical field [0001] The invention belongs to the field of oil and gas field development engineering, and in particular relates to a packer used in complex small well bores, which is mainly used for interval isolation in small-diameter horizontal well bores with multiple steps. Background technique [0002] With the expansion of the exploration and development scale of tight oil and gas in my country, only 583 horizontal wells were completed by staged fracturing in a certain block of Sinopec by the end of 2014. As many as 65% of the wells; 80% of the horizontal wells are completed by "multi-level sliding sleeve preset string", which has a long horizontal section, small borehole diameter, and steps There are many stages, which brings difficulties to the realization of workover, water plugging or secondary completion of fracturing in the later stage. Therefore, based on the research on the secondary completion technology under the open hole sliding sleeve completion method, i...

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Problems solved by technology

[0003] At present, domestic development of tight sandstone gas mostly adopts 51 / 2" casing completion or open hole preset sliding sleeve completion (using 41 / 2" base pipe). When the production stage is low, low liquid and low efficiency, secondary completion is required The pipe string is run in sections to measure, requiring the use of small diameter packers (outer diameter smaller than ) smoothly into the wellbore with ball seat steps and other irregularities. The inner diameter of the seal is However, the packers in the prior art have different limitations and cannot meet the requirements of running and sealing irregular slim holes.

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