Sealing blocking agent for blasthole

Abstract

The invention provides a petroleum recovering embrasure plugging agent, mixed of five materials in percent: cinder (particle size less than 2 mm) 7%-11%, powder coal ashes 36%-44%, calcium-based colloidal clay 16%-22%, wood powder (particle size less than 0.5 mm) 1%-5% and thermosetting Arcolite 18%-20%. It has high strength, adjustable curing time, specific flexibility, good combinability with stratum rocks, low density, ability to fully plug the whole embrasure, good water, oil, acid, alkali and temperature resistance, etc.

Description

Technical field: [0001] The invention relates to an oilfield chemical agent, in particular to a blasthole plugging agent. Background technique: [0002] In the process of oilfield development, most of the oil wells are combined production of oil layers above the second layer. After the oil field enters the high water cut period, the injected water rushes along the high permeability layer, making the high permeability layer become a high pressure layer, affecting the normal fluid production of the middle and low permeability layers. At the same time, due to the long-term water injection development, the remaining oil saturation of the high-permeability layer decreases, and the utilization value decreases. Therefore, some high-permeability layers need to be sealed. At the same time, in the work of repairing holes and changing layers, due to reasons such as electrical measurement interpretation errors and perforation errors, misinjection of water layers also occurs from time ...

AI Technical Summary

Problems solved by technology

Due to the high temperature and high pressure reservoir conditions in Zhuangxi area, the validity period of mechanical sealing is short and the success rate is low

The chemical plugging method is mainly to inject a plugging agent into the target layer to seal off the surrounding area of ​​the blast hole. The currently used plugging agent is mainly cement, but the amount of plugging agent required for cement extrusion is large (average 30m3 per well) 3 ), plugging is required after plugging, the construction is dangerous, the cost is high (the average cost of plugging agent for each well is 60,000 yuan), and the process is complicated.

The resin ball blasthole plugging agent researched by Daqing Petroleum Institute has limited its industrial application due to the need for special equipment for construction and difficulties in on-site operation.