Pipe column for horizontal well

Abstract

The invention discloses a pipe column for a horizontal well. The pipe column comprises an oil pipe, a first centering guide, a first packer, a constant pressure valve, a second centering guide and a ball seat, wherein the first centering guide, the first packer, the constant pressure valve, the second centering guide and the ball seat are sequentially arranged on the oil pipe in a sleeved mode, and the ball seat is used for blocking off the oil pipe. The first packer comprises a first center pipe and a first rubber sleeve, wherein the first center pipe is communicated with the oil pipe and provided with a first flow guide hole for applying pressure on the first rubber sleeve. The inlet end of the constant pressure valve is communicated with the oil pipe. The inner diameter of the first rubber sleeve of the first packer is 58-62 mm, and the length of the first rubber sleeve of the first packer is 950-1200 mm. According to the pipe column, after pressure is applied on the interior of the oil pipe, the first packer is downed and sealed so that a water exit interval and an oil interval can be effectively separated, and then the constant pressure valve is opened to inject a chemical blocking agent in a set direction to block off the water exit interval. According to the pipe column, water exploration can be carried out, the water exit interval and the oil interval can be effectively separated, the influence of the chemical blocking agent on the oil interval is reduced, and water control and oil increase of the horizontal well are achieved.

Description

technical field [0001] The invention relates to a water plugging pipe string in the field of oil recovery technology, in particular to a pipe string for a horizontal well. Background technique [0002] Horizontal well development technology is an important and complex technology in oilfield development, which has been widely used in major oilfields at home and abroad. Horizontal well development technology has obvious advantages over vertical well development technology in tapping the potential of old areas, producing marginal reserves, and developing thin-bed and bottom-water reservoirs. However, horizontal wells have the characteristics of a large contact area between the permeable section and the water layer, and there will be a water-producing layer in the horizontal well. During production, oil and water in the same layer are likely to occur, which greatly affects the efficiency and quality of oil production. Due to the lack of effective horizontal well water plugging ...

AI Technical Summary

Problems solved by technology

However, due to the large diameter, complex structure and short plugging distance of the mechanical water plugging string, there will be problems such as pipe jamming, difficulty in unblocking, inability to accurately implement long-distance plugging of the water outlet layer of horizontal wells, and easy failure during operation.

Moreover, the mechanical water plugging string can only completely block a certain length of the oil well. There is no way to deal with the phenomenon of water and oil at the same place at the same time. It can only block the water and oil holes at the same place together, and it is impossible to only block the water. plugging

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