Plugging material

Abstract

The invention discloses a novel plugging material, comprising the following components in percentage by weight: 0.1-0.4 parts of fiber, 0.5-2.5 parts of shell, 2-4 parts of saw dust, 3-6 parts of rubber powder, 1-5 parts of mica, and 1-5 parts of roseite. The plugging material has the advantages that the plugging effect is obvious, the plugging material is made without other complex process; the cement slurry with the plugging material is good in liquidity and easy to confect in the field without other rigorous requirements to ground construction apparatus; the cement strength is developed fast and is proper, so as to avoid new borehole in drilling and plugging processes, thus completely satisfying the field needs.

Description

technical field [0001] The invention relates to the field of oil field drilling, in particular to a novel plugging material. Background technique [0002] At present, the leakage plugging technology of Tahe Oilfield has undergone continuous development, and has formed bridge slurry plugging, cement extrusion plugging, bridge slurry and cement fluid plugging, fiber cement slurry plugging and other technologies, which can basically solve the problem of Permian leakage. , but it cannot completely solve the plugging problem of the Permian system. Bridging slurry plugging can deal with partial leakage or lost-return leakage caused by pores and cracks, but this method must fully understand the size of the leakage pores or the opening of cracks, so that materials of different shapes and sizes can be used to form bridge plugging. Due to the current lack of understanding of the formation where lost circulation occurs, the combination of bridge slurry plugging particles used is based...

AI Technical Summary

Problems solved by technology

[0002] At present, the leakage plugging technology of Tahe Oilfield has undergone continuous development, and has formed bridge slurry plugging, cement extrusion plugging, bridge slurry and cement fluid plugging, fiber cement slurry plugging and other technologies, which can basically solve the problem of Permian leakage. , but cannot completely solve the plugging problem of the Permian

Bridge grout plugging can deal with partial leakage or loss-return leakage caused by pores and cracks, but this method must fully understand the size of the leakage pores or the opening degree of cracks, so that materials of different shapes and sizes can be used to form bridge plugging

Due to the current lack of understanding of the formation where lost circulation occurs, the combination of bridge slurry plugging particles used is based on experience, and the success rate of one-time plugging is low, which has a serious impact on subsequent cementing operations; the success rate of conventional cement slurry plugging is low. The pumped cement slurry often all enters the stratum crevices and causes plugging failure. It must cooperate with the bridge grout to bear the pressure to plug the leakage; the fiber plugging cement slurry can plug the leakage of medium and small cracks with clear positions, and the effect can be seen from the application situation Good, achieved certain results, but because the strength of the formed cement is too high, when it is higher than the strength of the formation rock, it is easy to drill a new wellbore when drilling a plugging cement plug, and a new lost zone appears, resulting in footage loss and affecting drilling speed up

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