Open hole packer

Abstract

The invention provides an open hole packer. The open hole packer comprises an inner sleeve, a hydraulic cylinder, a rubber barrel and an end ring, and the hydraulic cylinder, the rubber barrel and the end ring are sequentially arranged on the outer wall of the inner sleeve in series. An annular space is formed between the hydraulic cylinder and the inner sleeve in an enclosed mode. An overflowing hole which can be aligned to the annular space is formed in the wall of a casing pipe and the wall of the inner sleeve. Melting retainer rings are arranged at the two ends of the inner sleeve. The two ends of the inner sleeve are provided with fixing rings matched with the casing pipe. The melting retainer rings are arranged between the fixing rings and the casing pipe. According to the open hole packer, the effects that during casing pipe thermal expansion, the melting retainer rings on the two sides of the packer are melted, and the axial constraint between the casing pipe and the inner sleeve disappears can be ensured, thus, the casing pipe and the inner sleeve can move relatively, and then the effect that the sealing effect of the packer is not affected is ensured.

Description

technical field [0001] The invention relates to the technical field of petroleum and natural gas development, in particular to an open hole packer used in the open hole staged fracturing process. Background technique [0002] At present, in the process of oil and gas field development, especially in the open-hole staged fracturing process of vertical wells or horizontal wells, open-hole packers are generally used for staged completion and stimulation. The use of open-hole packers can take targeted stimulation measures for each production layer of the oil and gas field, for example, increasing the acid strength or increasing the scale of sand fracturing, so as to truly achieve the effective release of near-wellbore plugging in all production layers , communicate the purpose of the reservoir. [0003] Open hole packer, as one of the important tools in the staged reconstruction process of open hole completion, can mainly play the role of sealing the open hole reservoir section...

AI Technical Summary

Problems solved by technology

However, most of the existing open-hole packers are fixed on the casing. After setting, the thermal expansion of the casing will cause displacement with the open-hole wall, which will affect the isolation effect and even cause isolation failure.

At the same time, due to the inevitable occurrence of various problems downhole during the oil production stage, well washing and workover operations are required, and the packer in the setting state will affect the lifting operation of the casing

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