High-temperature resisting and high-pressure resisting injecting and extracting integrated double-layer hollow sucker rod

Abstract

The invention relates to a high-temperature resisting and high-pressure resisting injecting and extracting integrated double-layer hollow sucker rod. In order to overcome the defects that the gas-injecting and oil-extracting two sets of tubular columns are required by the present steam injection oil extracting technology and the sealing effect cannot meet the requirement of a steam injection operation, an upper joint, a rod body and a lower joint of the hollow rod provided by the invention are fixedly connected in turn from up to down; a central pipe is located in the hollow rod; a space between an outer pipe and an inner pipe of the central pipe is hollow and annular; a metal sealing ring I is mounted in an annular slot at an upper end of a connecting thread of the lower joint; a metal sealing gasket is mounted on an upper end face of the connecting thread of the lower joint; and a metal sealing ring II is mounted between a lower end part of the inner pipe of the central pipe and a lower fixing sleeve. The high-temperature resisting and high-pressure resisting injecting and extracting integrated double-layer hollow sucker rod has the beneficial effects that the structure is reasonable; the metal sealing rings are adopted, so that the hollow sucker rod has high-temperature and high-pressure resisting properties and can meet the requirement of the steam injection oil extracting technology; the steam injection and oil extraction producing operation is finished by the next tubular column; and the technical blank of a super heavy oil steam-injecting oil-extracting integrated tubular column is filled up.

Description

technical field [0001] The invention relates to a vacuum double-layer hollow sucker rod, in particular to a high-temperature and high-pressure resistant integrated double-layer hollow sucker rod for injection and production, which is especially suitable for gas injection and oil production operations in super-heavy oil steam injection wells. Background technique [0002] With the continuous deepening of petroleum development, the proportion of super heavy oil and high pour point oil is increasing. At present, steam injection technology is mostly used for super heavy oil and high pour point oil. The steam injection process usually requires two sets of process strings for gas injection and production. First, the gas injection string is lowered for steam injection operation. After the gas injection, the gas injection string is lifted out of the wellbore, and then the gas injection string is lowered for oil recovery and production operations. Since the temperature of the injecte...

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Problems solved by technology

[0004] In order to overcome the deficiency that the existing steam injection oil production process needs to use two sets of pipe strings for gas injection and oil production, and the vacuum double-layer hollow sucker rod

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