Sliding sleeve nozzle for open hole fracturing

Abstract

The invention discloses a sliding sleeve spray nozzle for open hole fracturing. The sliding sleeve comprises a spray nozzle outer drum, a spray nozzle middle drum and a spray nozzle inner drum, which are sleeved together in sequence; external threads are formed at the outer peripheral surface of one end, far away from the spray nozzle middle drum, of the spray nozzle outer drum; the outer peripheral surface sleeved at one end of the spray nozzle middle drum is hexagonal to be conveniently mounted with a spanner; limiting structures for preventing the stripping from one another and sealing structures for preventing leaking are formed at the corresponding sleeving positions; the spray nozzle middle drum and the spray nozzle inner drum can be contracted into or extend out from the spray nozzle outer drum under the action of external force. The spray nozzle outer drum is mounted in the sliding sleeve and the length, extending out of a sliding sleeve, of the sliding sleeve spray nozzle is equal to the annular space gap between the sliding sleeve and a stratum. The sliding sleeve spray nozzle is good in fracturing point fixing property and can be prevented from accidentally extending when entering an open hole, the gap between the annular space and the sliding sleeve can be automatically adjusted and the sliding sleeve spray nozzle is prevented from being extruded back by a well wall due to shaking during construction.

Description

technical field [0001] The invention relates to the technical field of oil and gas field exploitation, in particular to a sliding sleeve nozzle for open hole fracturing which is matched with a well sliding sleeve in the fracturing technology. Background technique [0002] The use of sliding sleeve packers to implement fracturing stimulation is a common process for multi-stage stimulation of open-hole horizontal wells in oil and gas fields. The sliding sleeve completes the connection and isolation between the wellbore and the oil layer through switching actions. After the sliding sleeve is opened, the fracturing fluid enters the formation through the outlet on the sliding sleeve, thereby forming formation fractures near the position of the sliding sleeve. [0003] The current open-hole fracturing technology is poor in positioning, which is mainly manifested in the fact that the fracture position does not correspond to the fluid outlet position of the sliding sleeve. At the s...

AI Technical Summary

Problems solved by technology

[0003] The current open-hole fracturing technology is poor in positioning, mainly because the fracture position does not correspond to the fluid outlet position of the sliding sleeve

At the same time, due to the annulus between the casing and the wellbore, the fracturing fluid will lose a considerable amount of hydraulic energy when passing through the annulus, and the high-pressure fluid ejected from the fluid outlet cannot be used to assist in the formation of fractures.

The hydraulic jet fracturing tool can improve the fixed point of fracturing to a certain extent, but because it needs to be taken out from the wellbore after construction, the nozzle is relatively short to ensure that it is consistent with the outer diameter of the tool, so that it cannot directly contact the formation. Large loss of hydraulic capacity

Therefore, the nozzles of hydraulic jet fracturing tools are not suitable for sliding sleeve fracturing

[0004] There is no damping self-locking structure between the traditional retractable nozzle components, which may cause the nozzle to accidentally protrude due to vibration during the stringing of the pipe into the well, resulting in accidents

On the other hand, the undamped nozzle assembly may retract due to the vibration of the pipe string and be squeezed by the well wall during normal work after extension, thus losing the energy-gathering effect of the nozzle

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