Filling and leakage blocking process for cracking leak gravel

Abstract

The invention relates to a plugging technology, especially plugging technology with gravel for cracking leakage. First 2-5t gravel with the uneven grain size is poured and entered gravel with different grade blocks relative crack. Then one drill extends to pull gravel out so that gravel enters into relative crack at the greatest level. Naked drill-stem extends to the position in 20-60m to the top layer of leakage layer and cement is injected. Because gravel is resorted in crack and cement paste flowing further is hindered cement plug is formed. The technology is used to solve extra crack leakage in Luohe formation of Longdong area, especially extra malignancy leakage with leakage amount more than 130 stere per hour, still fluid face less than 150m and bridge plug leakage stoppage so on.

Description

technical field

[0001] The invention relates to a plugging technology, in particular to a plugging technology of fracture leakage gravel filling. Background technique

[0002] The Luohe layer in the Longdong area belongs to the large-pore high-permeability low-pressure sand-water layer, and the well depth is between 750 meters and 1200 meters. The sand particles in the Luohe Formation are medium sand, fine sand, and silt sand, and most of the particle diameters are below 250um. The leakage of the Luohe Formation constitutes the main force of large-scale leakage in the Longdong area, accounting for more than 80% of the large-scale leakage every year on average. The catastrophic leakages all occurred in the Luohe Formation. There are abnormal pressure zones in the Luohe formation in some areas of the Longdong block, and the formation pressure coefficient is only between 0.76 and 0.86. By taking 3-meter cores from the leaky layer in the Luohe section of Well Xi 29-02, the nak...

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