CN2410410Y - High efficient injection-production dual-purpose energy-saving oil pipe for thickened oil - Google Patents

Abstract

The utility model relates to an injection-production dual-purpose and energy-saving oil pipe with high efficiency for thick oil, which is suitable for dual-purpose downhole oil pipes used for injecting and producing the thick oil and the super thick oil or downhole oil pipes only used for producing the oil. An outer pipe is fixedly connected with an inner pipe through a baffle ring, heat insulation shields are arranged at annular space between two pipes and the outer side of the inner pipe and the inner side of the outer pipe, and the heat insulation shields are separated by a stepped ring which nears an outer heat insulation shield of the inner pipe. The contacting part of the stepped ring and the inner pipe is provided with a spacing circular recess, the vacuum among the heat insulation shields is pumped, and both ends of the outer pipe are provided with taper external screw-threads. The utility model has the advantages that the operation cost and the environmental pollution are reduced, the oil production of an oil well is increased, the service life of the oil well is prolonged, the electric energy is saved greatly, the inner pipe area is increased by 50 percents, and the heat loss rate with 350 DEG C is 20 percents of a light oil pipe.

Description

Viscous crude is adopted the double-purpose energy-saving oil pipe with efficient the notes

The utility model relates to a kind of viscous crude and adopts the double-purpose energy-saving oil pipe with efficient the notes, is applicable to make viscous crude, special thick oil filling steam, the dual-purpose down-hole oil tube of oil recovery, also is applicable to the down-hole oil tube of only making oil recovery usefulness.

The present insulated tubing internal diameter maximum specification of using is 62mm only, and interior latus rectum is little, and oil flow resistance is big, can not satisfy the production needs of heavy crude producing process matched therewith, so can only be used for the heavy oil wells steam injection; Owing to need when adopting viscous crude to convert the steam injection operation to oil producing operation, cause operating cost to increase, production efficiency is low; Because the isolation layer of existing insulated tubing adopts laminated aluminium foil to twine, closely connect with the silicate fiber felt between the name aluminium foil, both increased processing cost, increased the heat conduction heat exchange amount between the isolation layer again.

The purpose of this utility model is to provide low, the energy-conservation good viscous crude of a kind of heat loss rate to adopt the double-purpose energy-saving oil pipe with efficient the notes.

The purpose of this utility model is achieved through the following technical measures: this oil pipe is constructed as follows: circular outer pipe is connected with interior pipe through the shelves ring at two ends, in the annular space between two-layer oil pipe and interior tube outside, outer tube wall is provided with the screening heat shielding, between two-layer oil pipe, be provided with the step connecting ring, the compartment of terrain is provided with circular ring slot with the contact surface of minimizing with interior tube outside on the interior annulus surface of each step connecting ring, thereby reduced heat waste, the step connecting ring and the baffle ring at two ends are abutted against, the outer aluminium foil of the interior anchor ring of step connecting ring and interior pipe is abutted against, the screening heat shielding is arranged at the corresponding step place of adjacent step ring, hide heat shielding adopt coefficient of blackness be 0.02～0.04 cylindrical shape aluminium foil or red copper foil to reduce the hyperthermia radiation heat exchange, each hides and vacuumizes between the heat shielding to stop conduction of heat and heat convection; The outer tube two ends are provided with conical external screw thread and are used for linking to each other with down-hole oil tube, box cupling or flowline respectively.

Advantage of the present utility model: the one, reduce the environment pollution that workover treatment expense and operation cause; The 2nd, rate when increasing oil well production increases well oil output; The 3rd, to eliminate packer and the telescoping tube that easily breaks down the down-hole and saved the downhole tool cost of use, the oil jacket annular space can adopt nitrogen to isolate steam source, makes oil well casing avoid thermal stress damage under hot conditions, and then has prolonged the oil well life-span; The 4th, its heat-insulating property is good when recovering the oil with this oil pipe, saves electric energy significantly, and its fractional energy savings reaches 78-83%.The 5th, the former instlated tubular area of this pipe aperture section ratio increases more than 50%, and pressure is low during the oil well steam injection, and oil stream flow resistance is little during oil recovery, has certain energy-saving effect.

Fig. 1 be the utility model structure axially partly cut open schematic diagram,

Accompanying drawings structure of the present utility model and embodiment, of the present utility model being constructed as follows: circular outer pipe 4 external diameter φ 127, internal diameter φ 114.6, through the baffle ring (2,8) and the external diameter φ 89 at two ends, the interior pipe 6 of internal diameter φ 79 is connected; Two pipe ranges, 9.5～9.7m, in the annular space between two-layer oil pipe and interior tube outside, outer tube wall equally spaced are provided with and hide heat shielding 5, between two-layer oil pipe, be provided with step connecting ring (3,7), the compartment of terrain is provided with annular groove on its interior anchor ring, the step connecting ring and the baffle ring at two ends are abutted against, the interior anchor ring of step connecting ring and interior pipe hide heat shielding outward and are abutted against, and hide the corresponding step place that heat shielding 5 is arranged at adjacent step connecting ring; Each hides between the heat shielding and vacuumizes, and its absolute pressure value is 1000Pa; The outer tube two ends are provided with conical external screw thread and are connected with the internal thread of down-hole oil tube, box cupling 1 or flowline respectively, heat loss rate is original 1/3 when adopting two-layer screening heat shielding as calculated, through repeatedly test, 350 ℃ of heat loss rates have only 20% of blank tubing, with existing insulated tubing ratio, heat loss rate descends 10% at least.

Claims (3)

1, a kind of viscous crude is adopted the double-purpose energy-saving oil pipe with efficient the notes, it is characterized in that this oil pipe is constructed as follows: circular outer pipe (4) is connected with interior pipe (6) through the baffle ring (2,8) at two ends; In the annular space between two-layer oil pipe and interior tube outside, outer tube wall equally spaced is provided with and hides heat shielding (5), between two-layer oil pipe, be provided with step connecting ring (3,7), the compartment of terrain is provided with annular groove on its interior anchor ring, the step connecting ring (3) at two ends is abutted against with baffle ring, and the interior anchor ring of step connecting ring and interior pipe hide heat shielding outward and be abutted against; The screening heat shielding is arranged at the corresponding step place of adjacent step connecting ring; Each hides between the heat shielding and vacuumizes; The outer tube two ends are provided with conical external screw thread and are connected with the internal thread of down-hole oil tube, box cupling (1) or flowline respectively.

2, by the described double-purpose energy-saving oil pipe of claim 1, it is characterized in that the external diameter of outer tube (4) is φ 127, internal diameter is φ 114.6; The external diameter of interior pipe (6) is φ 89, and internal diameter is that the length of φ 79, two pipes (4,6) is 9.5～9.7m.

By claim 1 or 2 described double-purpose energy-saving oil pipes, it is characterized in that 3, hiding heat shielding (5) is four layers.

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