Sand protection matching pipe string for high-throughput sand filter pipe

Abstract

The invention relates to a sand protection matching pipe string for a high-throughput sand filter pipe. The sand protection matching pie string comprises a packer, a conversion coupling, a high-throughput sand filter pipe and a time delay self-locking valve or plug, wherein the conversion coupling is connected with the packer and is arranged at the back end of the high-throughput sand filter pipe, and the time delay self-locking valve or plug is arranged at the front end of the high-throughput sand filter pipe; high-throughput sand filter units are sequentially connected by a double-male left-hand coupling end to end to form the high-throughput sand filter pipe, and a high-temperature resistant broken centralizer is arranged on the outer surface of the middle of the double-male left-hand coupling; and a broken bracket is arranged between the high-temperature resistant broken centralizer arranged on the outer surface of the double-male left-hand coupling and the high-throughput sand filter unit. The high-temperature resistant broken centralizer can ensure that the high-throughput sand filter pipe is positioned at the center of a shaft, so that formation fluid evenly supplies fluid to a sand filter from the shaft, and meanwhile, the wear of the shaft to the sand filter in the logging process is reduced, the success rate of logging is ensured, the breaking is easy, and the replacement operation is not affected.

Description

technical field [0001] The invention relates to a high-throughput sand filter pipe sand control supporting string, which belongs to the technical field of oil well sand control equipment. Background technique [0002] Unconsolidated sandstone oil reservoirs in my country are widely distributed and have large reserves. Except for the Sichuan Basin, unconsolidated sandstone oil reservoirs exist in various oil and gas regions across the country, such as Gudao Oilfield, Gudong Oilfield, Dagang Oilfield, Suizhong Oilfield, Qinhuangdao Oilfield in the Eastern Bohai Bay Basin. Oilfield, Liaohe Oilfield in Songliao Basin, Karamay Oilfield and Tuyuk Oilfield in Jungar Basin in the west, etc. Sand production in oil layers is the main obstacle to the low oil recovery rate of these oil reservoirs. [0003] During the production process, due to the loose cementation, low strength and fluid scouring of the reservoir, the sandstone layer structure near the perforation tunnel or the bottom h...

AI Technical Summary

Problems solved by technology

The main forms of heavy oil thermal recovery are steam huff and puff and steam flooding. The injection of steam causes thermal stress and destructive force on the filter sand pipe. Under the action of continuous high temperature and axial tensile stress, fatigue cracks and compression deformation occur. Some filter sand The temperature resistance of ordinary quartz sand filter pipes is far lower than that of thermal recovery. If used in high temperature thermal recovery, the sand filter tube will be damaged. Therefore, ordinary quartz sand filter tubes cannot be used for sand control in thermal recovery wells at all.

[0007] Horizontal well sand control technology: With the continuous development of oilfield development technology, the development of horizontal wells is an important measure to reduce the cost of oilfield development, reduce the area occupied by cultivated land, facilitate centralized management, improve oilfield management level and increase oil production. As an important development measure for offshore oilfields, since the vertical part of the wellbore of the horizontal well is bent by a certain arc after deflection, the perforation casing extends horizontally to the oil layer and crosses the oil layer, and the perforation section is long, so sand control is more difficult. Due to the brittleness of the quartz sand filter tube, it is difficult to bend through the radian of deflection during the downhole process, so it cannot be used for sand control in horizontal wells; other sand filter tubes such as wire-wound sand filter tubes and metal wool The sand is relatively difficult, and it is easy to break when pulled out obliquely or cannot be pulled out at all, resulting in overhaul or scrapping of the oil well; causing huge economic losses to the oil field

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