Continuous cable laying pipe switch sliding sleeve for oil extraction and using method

Abstract

The invention discloses a continuous cable laying pipe switch sliding sleeve for oil extraction and a using method. The continuous cable laying pipe switch sliding sleeve comprises an upper connector,a sliding sleeve outer barrel, a sliding sleeve inner barrel, a high-temperature meltable base, a support, a supporting block and a lower connector. The lower end of the upper connector is connectedwith the upper end of the sliding sleeve outer barrel, the lower end of the sliding sleeve outer barrel is connected with the upper end of the lower connector, the supporting block is arranged on thelower middle side of the inner wall of the sliding sleeve outer barrel, and the support is arranged on the inner side of the sliding sleeve outer barrel and arranged in the supporting block. The innerside of the sliding sleeve outer barrel coaxially sleeve the high-temperature meltable base, the high-temperature meltable base is arranged at the upper end of the supporting block, the inner side ofthe sliding sleeve outer barrel coaxially sleeve the sliding sleeve inner barrel, the sliding sleeve inner barrel is arranged at the upper end of the high-temperature meltable base and can slide along the inner wall of the sliding sleeve outer barrel in an attached mode, and through holes are formed in the corresponding positions of the sliding sleeve outer barrel and the sliding sleeve inner barrel.

Description

technical field [0001] The invention belongs to the technical field of oil production in oil fields, and in particular relates to a switch sliding sleeve for a continuous cable-laying pipe used in oil production and a use method thereof. Background technique [0002] At present, the application of continuous laying cable pipes in the field of oil production is becoming more and more extensive. However, before the continuous cable laying pipe goes into the well, its lower end needs to be connected with oil production pumps such as screw pumps and electric submersible pumps in advance. After the well fluid, because the hollow structure is affected by the buoyancy, the running resistance increases, and even the buoyancy of the upper top is greater than the bending strength of the continuous cable-laying pipe, and the cable-laying pipe is severely bent and deformed in the wellbore and cannot be run in. In addition, when the pump is lifted out of the pipe string, if the liquid i...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art, to provide a kind of continuous cable application switch sliding sleeve for oil production and its use method, which overcomes the problems in the prior art when the continuous cable application tube enters the well fluid if there is no liquid inlet channel. Because the hollow structure is affected by the buoyancy, the running resistance increases, and even the buoyancy of the upper top is greater than the bending strength of the continuous cable-laying pipe, and the cable-laying pipe is severely bent and deformed in the wellbore and cannot be run in; Early discharge will greatly increase the gravity of the pipe string and the difficulty of operation. What is more serious is that the internal pressure generated by the liquid in the pipe string on the continuous cable laying pipe will gradually decrease as the pipe string is pulled out, and the pipe string The combined internal and external hydraulic forces gradually increase. When the force on the pipe string is greater than the pressure limit of the continuous cable-laying pipe, the cable-laying pipe will be cracked and scrapped; The downhole oil flow will be directly discharged into the wellbore from the sub-joint of the liquid inlet channel, and the oil flow cannot be lifted to the wellhead along the continuous cable laying pipe, resulting in production failure and other problems

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