Gravel Pack Strings and Gravel Pack Methods

Abstract

The invention discloses a gravel packing pipe column and a gravel packing method. The gravel packing pipe column comprises an inner pipe column body and an outer pipe column body, the outer pipe column body comprises a top packer, an extension barrel, a packing sliding sleeve, a sealing barrel, a load display coupling, an upper buckling joint, a leakproof valve, a safe joint, a sieve pipe, an O-shaped ring sealing barrel and a floating shoe, and the inner pipe column body comprises a setting tool, a diversion valve, a sealing assembly, a packing turning tool, a reverse-circulation single flow valve, a load displayer, a flushing pipe, a leakproof valve opening and closing tool and an insertion polishing pipe. The gravel packing pipe column and the gravel packing method can be applied to the field of petroleum exploitation; in the process of gravel packing, sand-carrying liquid enters through the inner pipe column body and enters a barefoot section oil layer through the packing turning tool and the packing sliding sleeve, the sand in the sand-carrying liquid is blocked in the oil layer, liquid enters an annular space of the inner pipe column body through the sieve pipe to continue to flowing upwards till flowing back to the ground so as to complete the process of gravel packing from top to bottom, and gravel packing sand-preventive needs of most single-layer barefoot wells or sleeve wells on the sea currently are met.

Description

technical field [0001] The invention relates to oil extraction technology, in particular to a gravel packing string and a gravel packing method. Background technique [0002] At present, most of the oil reservoirs in my country's Bohai Sea block are of unconsolidated sandstone structure, which require sand control completion. Gravel packing for sand control. Most of the gravel packing technologies fix the completion string with the screen in the wellbore, and then use the service tool string to transport the sand-carrying fluid to the annular space between the screen and the wellbore, and filter out the sand and leave it outside the screen to form a packing layer , and the rest of the liquid filtered out of the sand returns to the wellhead through the channel in the service tool string. [0003] Foreign gravel packing sand control technology has been developed for many years, and now it has been very maturely applied. Domestic land oilfields began to use foreign sand contro...

AI Technical Summary

Problems solved by technology

[0003] Foreign gravel packing sand control technology has been developed for many years, and now it has been very maturely applied. Domestic land oilfields began to use foreign sand control technology gradually in the 1980s, but offshore gravel packing sand control technology was rarely involved, resulting in related domestic Autonomous technology is still in its infancy

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