Radial horizontal well drilling and sand control completing tool and method

Abstract

The invention belongs to the technical field of well drilling and completing of oil and gas fields, and in particular relates to a radial horizontal well drilling and sand control completing tool andmethod. The tool is characterized by comprising a radial horizontal well drilling auxiliary tubular column, a radial horizontal well drilling tool string and a sand control tool. The radial horizontalwell drilling auxiliary tubular column comprises a depth adjusting tool, a special oil pipe combination, a depth calibrating tool, an orientation measuring auxiliary tool, an axial anchoring tool, anorientation adjusting tool and a drill-in guiding tool connected in series. The radial horizontal well drilling tool string comprises a logging cable, a circular liquid feeding tool, a gravity sealing tool, a peripheral anchoring tool, a power motor, an adapter connector, a flexible drill pipe and a milling and drilling bit tool. A 10-20 m (hard formation) stable drainage channel can be formed between a shaft and an oil layer to replace a conventional perforated hole for deep penetration completion to pass through a near-well pollution zone and penetrate through an invasion zone of an oil well, so that the injection rates of a water injection well, a gas-injection well and a disposing well are improved.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field drilling and completion, and in particular relates to a radial horizontal drilling and sand control completion tool and method. Background technique [0002] In the process of drilling and workover, the formation will inevitably be polluted. According to relevant literature reports: the pollution radius is about 0.6-1.5m, and the pressure drop within 10m from the wellbore accounts for more than 60%. rate will drop as a result. [0003] The penetration depth of commonly used perforation methods is relatively short, only 0.4-1m, and the perforation compaction effect is likely to cause secondary damage to the formation, and the permeability around the blasthole is reduced by 70%-80%. Radial hydrojet drilling technology can successfully penetrate the pollution zone, remove near-well pollution, and increase the drainage area of ​​the wellbore, but it is only applicable to relatively soft for...

AI Technical Summary

Problems solved by technology

[0003] The penetration depth of commonly used perforation methods is relatively short, only 0.4-1m, and the perforation compaction effect is likely to cause secondary damage to the formation, and the permeability around the blasthole is reduced by 70%-80%.

Radial hydrojet drilling technology can successfully penetrate the pollution zone, remove near-well pollution, and increase the drainage area of ​​the wellbore, but it is only suitable for relatively soft formations, and the construction effect in hard formations is limited

In addition, for the strata that are easy to collapse and produce sand, the holes after spraying are unstable and easy to collapse and block, which seriously affects the construction effect

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