Two-way extruding type packing mechanism

Abstract

The invention discloses a two-way extruding type packing mechanism. The packing mechanism comprises a central tube, a rubber barrel, and further comprises an upper compression sleeve, a supporting sleeve and a lower compression ring, wherein the supporting sleeve tightly sleeves the outer wall of the central tube, the rubber barrel sleeves the outer side of the supporting sleeve, the upper and lower ends of the rubber barrel are respectively provided with the upper compression sleeve and the lower compression ring, wherein the lower end of the upper compression sleeve is in a wedge shape and is inserted downwards directly into an annular space between the supporting sleeve and the rubber barrel, the upper end of the lower compression ring is also in a wedge shape and is inserted upwards directly between the upper compression sleeve and the rubber barrel. The upper and lower ends of the central tube are respectively connected with an upper connector and a lower connector, a piston cavity is formed between the central tube and the lower connector and is provided with a set packing piston, an inner cavity of the central tube is communicated with the piston cavity, the upper end of the set packing piston is butted against the lower end face of a regulating ring. The packing mechanism adopts a wedge-shaped compression structure, and the rubber barrel is not only subjected to the axial compressive force of the upper and lower compression sleeves, but also subjected to the wedge-shaped circumferential radial compressive force when the rubber barrel is set packed, so that higher annular space sealing capacity and pressure capacity are obtained.

Description

technical field [0001] The invention relates to a sealing mechanism for an oil field, in particular to a two-way extrusion type sealing mechanism. Background technique [0002] Most of my country's oilfields are heterogeneous multi-layer reservoirs with prominent conflicts between layers. In order to achieve balanced oil recovery in each layer, the injection-production process often adopts layered systems for development, and the isolation mechanism is a key tool for layered development. Since most of the oil reservoirs in the developed oilfield are loose sandstone reservoirs, it is necessary to leave a large-diameter wellbore after layered sand control to realize the control of subsequent layered water injection or layered oil recovery, but the conventional one-way compression seal Isolation mechanism, when the isolation mechanism is required to isolate the layered seal of the oil casing annulus, and the axial pressure resistance is higher, such as extrusion packing or frac...

AI Technical Summary

Problems solved by technology

Since most of the oil reservoirs in the developed oilfield are loose sandstone reservoirs, it is necessary to leave a large-diameter wellbore after layered sand control to realize the control of subsequent layered water injection or layered oil recovery, but the conventional one-way compression seal Isolation mechanism, when the isolation mechanism is required to isolate the layered seal of the oil casing annulus, and the axial pressure resistance is higher, such as extrusion packing or fracturing packing sand control technology, due to the limitation of the size of the drilling wellbore and the production casing , under the condition of small piston area, the sealing mechanism rubber tube is squeezed axially and unidirectionally by the setting piston, and the pressure to realize the sealing of the oil sleeve annulus is limited, and the effect of layered sealing is not good

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