CN102926677A

CN102926677A - Long-tail-pipe oil pumping pipe column for preventing corrosion of casing

Info

Publication number: CN102926677A
Application number: CN2012105038364A
Authority: CN
Inventors: 邢景宝; 靳宝军; 吴家松; 吉树鹏; 李喜平; 李树军; 方彦春; 李臣; 吴妍
Original assignee: China Petroleum and Chemical Corp; Sinopec Northeast Oil and Gas Co
Current assignee: China Petroleum and Chemical Corp; Sinopec Northeast Oil and Gas Co
Priority date: 2012-12-02
Filing date: 2012-12-02
Publication date: 2013-02-13

Abstract

The invention relates to a long-tail-pipe oil pumping pipe column for preventing corrosion of a casing. After a pump upper oil pipe and an oil well pump are connected, the pump upper oil pipe and the oil well pump are arranged into the casing downwards, an oil layer is communicated with the casing, the oil well pump is located below a working fluid level, a lengthening tail pipe is connected below the oil well pump, and an oil well pump suction inlet is formed below the lengthening tail pipe and located below the oil layer; and after water-contained well liquid flows into the casing from the oil layer, the water-contained well liquid downward flows to the oil well pump suction inlet and is pumped out by the oil well pump, when the water-contained well liquid flows downwards, oil water separation is generated, and a segment of the casing from the oil layer to the working fluid level is full of crude oil, so that the segment of the casing can not be corroded, and the purpose of preventing corrosion of the casing is achieved; and thus, according to the long-tail-pipe oil pumping pipe column for preventing corrosion of the casing, the service life of the casing can be prolonged, the benefit of oilfield development can be improved, and the long-tail-pipe oil pumping pipe column for preventing corrosion of the casing has a remarkable economic benefit.

Description

The long-tail pipe is prevented the casing corrosion pumping pipe string

Technical field

The present invention is the flow string that petroleum industry is used, and is the anti-casing corrosion pumping pipe string of a kind of long-tail pipe.

Background technology

Present pumping pipe string generally be with the oil pumping pump intake on oil reservoir, during oil pumping, well liquid flow in the sleeve pipe from the stratum, upwards to moving, flows in the oil well pump through the oil pumping pump intake again.Well liquid is in flowing to this section of oil pumping pump intake distance, the well liquid that flows will contact with internal surface of sleeve pipe, owing to containing certain water yield in the well liquid, be dissolved with the corrosivity mineral in the water, can produce corrosion to this section sleeve pipe that flows through, affect oil field development production the application life of reentrant bushing, makes the oil field produce heavy economic losses.

Summary of the invention

The objective of the invention is to design the anti-casing corrosion pumping pipe string of a kind of long-tail pipe, reduce the contact length that contains well liquid and sleeve pipe that flows, prevent casing corrosion.

The object of the present invention is achieved like this: oil pipe, oil well pump are lowered in the sleeve pipe after connecting on the pump, oil reservoir communicates with sleeve pipe, and oil well pump is under the producing fluid level, connects under the oil well pump to lengthen tail pipe, lengthen the oil well pump intake is installed under the tail pipe, the oil well pump intake is under the oil reservoir.

The invention has the beneficial effects as follows: contain well liquid and flow to from oil reservoir and flow to oil well pump under backward in the sleeve pipe and suck eloquence and extracted out by oil well pump, when containing well liquid and flowing downward, can produce water-oil separating, oil reservoir has been full of crude oil to this section of producing fluid level sleeve pipe, this section sleeve pipe can be corroded, thereby reaches the purpose that prevents casing corrosion, therefore, the present invention can prolong the application life of sleeve pipe, improves the oil field development benefit, has significant economic benefit.

Description of drawings

Fig. 1 is the tubing string schematic diagram of the embodiment of the invention.

The specific embodiment

Below in conjunction with accompanying drawing embodiments of the invention are described.

As shown in the figure, oil pipe 2, oil well pump 3 are lowered in the sleeve pipe 1 after connecting on the pump, and oil reservoir 5 communicates with sleeve pipe 1, oil well pump 3 is under the producing fluid level 6, connect lengthening tail pipe 4 under the oil well pump 3, lengthen oil well pump intake 7 is installed under the tail pipe 4, oil well pump intake 7 is under the oil reservoir 5.

Containing well liquid flows to sleeve pipe 1 from oil reservoir 5 and can only flow to oil well pump intake 7 after interior downwards and enter and lengthen tail pipe 4, then extracted out by oil well pump, contact few when containing well liquid and flowing downward with sleeve pipe 1, and when flowing downward, can produce water-oil separating, make oil reservoir be full of crude oil to this section of producing fluid level sleeve pipe, the sleeve pipe that contacts with crude oil can not be corroded.

The present invention is particularly useful for the dark well of oil reservoir, because distance is large between the dark well oil reservoir of oil reservoir and the oil well pump, the length of protective casing is large, more remarkable effect.

Claims

1. a long-tail pipe is prevented the casing corrosion pumping pipe string, oil pipe on the pump (2), oil well pump (3) are lowered in the sleeve pipe (1) after connecting, oil reservoir (5) communicates with sleeve pipe (1), oil well pump (3) is under the producing fluid level (6), it is characterized in that: connect lengthening tail pipe (4) under the oil well pump (3), lengthen oil well pump intake (7) is installed under the tail pipe (4), oil well pump intake (7) is under the oil reservoir (5).