screen tube

Abstract

The invention discloses a screen pipe, which relates to the technical field of oil and gas well sand control. The screen pipe comprises: a base pipe, the side wall of which has a first opening; The shell has a second opening on the side wall of the protective shell, and an annular accommodation cavity is formed between the base pipe and the protective shell; the pre-filled particle unit filled in the accommodation cavity, the pre-filled particle The unit includes ceramsite and soluble particles that can be dissolved in contact with oil or water or acid or alkali or salt or natural gas. The application can achieve the function of self-blocking removal, thereby prolonging the period of high and stable production of sand producing oil wells.

Description

technical field [0001] The invention relates to the technical field of oil and gas well sand control, in particular to a screen pipe. Background technique [0002] For unconsolidated sandstone reservoirs, sand control is an indispensable link in the exploitation process of such reservoirs, and plays an important role in the stable exploitation of crude oil. Since the 1990s, on the basis of the continuous improvement of the old sand control technology, technicians in this field have actively researched and developed new sand control technology and new methods, especially in the field of mechanical sand control. Rapid development has been achieved. At present, mechanical sand control technology exists as the main sand control method. [0003] However, from the perspective of field use, there are still two major problems in the sand control process of mechanical screens: 1. On the one hand, sand control mining in unconsolidated sandstone reservoirs causes screen clogging, whic...

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Problems solved by technology

[0003] However, from the perspective of field use, there are still two major problems in the sand control process of mechanical screens: 1. On the one hand, sand control mining in unconsolidated sandstone reservoirs causes screen clogging, which greatly reduces production capacity, and the mechanism of various screen clogging is not clear , no reasonable solution has been found for slowing down the blockage of the screen; 2. On the other hand, the partial blockage of the screen will lead to a decrease in the flow area of ​​the screen, and an increase in the pressure difference and local flow velocity, resulting in erosion damage to the screen , causing screen sand control failure, which is not uncommon in the current offshore oilfield production process

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