Oil well temporary blocking acidizing measurement technological system

Abstract

The invention discloses an oil well temporary blocking acidizing measurement technological system. The oil well temporary blocking acidizing measurement technological system comprises four parts which comprise an acid storage system, a water storage system, a pumping system and a guiding delivering system. The acid storage system and the water storage system are connected to the pumping system through the guiding delivering system, any passageway can be closed in necessity, the pumping system is connected to a wellhead, and thus the whole acidizing measurement system is formed. Each system comprises various novel devices so as to be differentiated from other similar acidizing systems. The series of problems that the permeability max-min ratio is large, acidizing block removal on a low-permeability layer is difficult, and water exudation is serious after acidizing can be effectively solved; blocking of a large-thickness layer or a longitudinal heterogeneous layer can be effectively removed, and the liquid production section can also be recovered and improved; through the technology, contradiction between water injection well layers can be relieved, the hydrophilic section is improved, and the water flooding thickness is increased; and construction is convenient, cost is low, and a reservoir stratum is not damaged.

Description

technical field [0001] The invention is suitable for reforming old oilfields in the petroleum field, especially in the technical field of stratum acidification with large permeability difference and difficult acidification reformation measures. Background technique [0002] The oil industry will take a series of downhole measures to improve the recovery rate. The acidizing and plugging removal measures are to use chemical reagents to acidify and dissolve the plugged parts to remove the plugging when the oil well or water injection well is blocked. The above mentioned are conventional Sexual acidification. [0003] In the early stage of oil well production, due to the heterogeneity of the formation, the poor physical properties of the reservoir, and the existence of oil test fracturing in the early stage, there are many fractures, resulting in extremely uneven water injection and liquid production profiles. It will cause some damage to the reservoir, so that the contradictio...

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Problems solved by technology

[0003] In the early stage of oil well production, due to the heterogeneity of the formation, the poor physical properties of the reservoir, and the existence of oil test fracturing in the early stage, there are many fractures, resulting in extremely uneven water injection and liquid production profiles. Cause certain damage to the reservoir, thus making the contradiction between layers more prominent, seriously affecting the improvement of oilfield development level

If only conventional general acidification is carried out, it will not be able to unblock the severely damaged layer well, but will increase the difference in vertical permeability

This is mainly because the acid liquid enters the zone with the highest permeability and the least damage first during the acidizing process, but little or no acid may enter the low-permeability zone that needs plugging removal or the seriously damaged layer, even in the same layer. Unable to achieve uniform distribution of acid

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