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Thermal insulation straight hole injection-production Y joint and using method thereof

A technology of straight holes and inner holes, which is applied in the field of heat insulation, allowing steel wire or cable operation devices, and can solve problems such as lack of heat insulation function, lack of heat insulation function, failure of electric submersible pump cables, etc.

Active Publication Date: 2021-09-07
CNOOC ENERGY TECH & SERVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the electric submersible pump cable cannot reach the steam temperature resistance of 370°C, the electric submersible pump cable will fail
At present, there is no Y joint with thermal insulation function for heavy oil steam huff and puff production, which brings difficulties to the realization of integrated steam huff and puff injection and production strings
[0003] Patent document CN201915930U, a special tee for thermal recovery, discloses an injection-production Y joint used in the integrated technology of offshore heavy oil thermal recovery injection-production, but does not have the function of heat insulation; patent document CN102364044A, dual-channel injection-production The switching device discloses the injection-production Y joint used in the integrated process technology of heavy oil thermal recovery injection and production, and does not have the function of heat insulation; patent document CN201265368Y, an integral Y joint, patent document CN101324176B, a spring self-switching Y Joint, and patent document CN100537998C spring-type "Y" joint for wells, have all mentioned the structure of downhole Y joint, but also do not possess heat insulation function

Method used

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  • Thermal insulation straight hole injection-production Y joint and using method thereof
  • Thermal insulation straight hole injection-production Y joint and using method thereof
  • Thermal insulation straight hole injection-production Y joint and using method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A heat-insulating straight-hole injection-production Y joint, including a lifting sub-section 1, an outer shell 2, an inner core 3, an upper guide shoe 5 and an inner guide shoe 6, the inner core 3 is set in the outer shell 2, and the tail end of the lifting sub-joint 1 extends into the The shell 2 is threadedly connected to the inner wall of the head end of the inner core 3, and the upper guide shoe 5 is installed on the head end of the outer shell 2, and the tail end of the upper guide shoe 5 is welded and fixed to the head end of the inner core 3, and the tail end of the outer shell 2 is connected to the inner core 3. The tail end is welded and fixed, and a packing cavity is formed between the inner wall of the shell 2 and the outer wall of the inner core 3, and the packing cavity is filled with filler 4;

[0041] The inner core 3 is a "Bu"-shaped structure, and an upper boss 3-11 and a lower boss 3-10 are integrally provided at both ends of the inner core 3 respectiv...

Embodiment 2

[0043] On the basis of Embodiment 1, the head end of the inner guide shoe 6 forms an inner guide shoe guide slope 6-1, and an inner guide shoe inner cylindrical surface 6-4 is formed below the inner guide shoe guide slope 6-1. The guide inclined surface 6-1 and the outer wall of the inner cylindrical surface 6-4 of the inner guide jointly form an outer cylindrical surface 6-6 of the inner guide shoe, and an upper circle of the inner guide shoe is provided on the outer cylindrical surface 6-6 of the inner guide shoe. The holes 6-7 and the round holes 6-8 under the inner guide shoe are used to pass part of the production liquid to prevent impurities from settling on the top of the production plug 12 during the production process, which will cause difficulties in salvaging the production plug 12. The inner cylinder of the inner guide shoe An inner shoe inner hole 6-2 is formed below the surface 6-4, and an inner shoe connecting thread 6-1 is formed on the outer wall of the inner s...

Embodiment 3

[0045] On the basis of Embodiment 2, the shell 2 adopts a hollow tubular structure, and the upper surface of the head end of the shell 2 is provided with an internal threaded hole 2-1 and an external threaded hole 2-2 of the shell, and the inner wall of the shell 2 is sequentially arranged from top to bottom. The upper inner surface 2-7 of the housing and the lower inner surface 2-6 of the housing are formed, and the outer wall of the housing 2 is symmetrically provided with cable grooves 2-5, and the side wall of the lower inner surface 2-6 of the housing is symmetrically provided with exhaust screw holes 2-6. 3 and the filler injection screw hole 2-4, the exhaust screw hole 2-3 is connected with the exhaust joint 8, the filler injection screw hole 2-4 is connected with the filler injection joint 7, and the filler 4 is injected into the filler cavity through the filler injection joint 7 , Then, the filling cavity between the inner core 3 and the outer shell 2 is evacuated thro...

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Abstract

The invention provides a thermal insulation straight hole injection-production Y joint and a using method thereof. An inner core is arranged in a shell; the tail end of a lifting nipple extends into the shell and is in threaded connection with the inner wall of the head end of the inner core; an upper guiding shoe is installed at the head end of the shell, the tail end of the upper guiding shoe is fixedly welded to the head end of the inner core, and the tail end of the shell is fixedly welded to the tail end of the inner core; a filler cavity is formed between the inner wall of the shell and the outer wall of the inner core, and a filler is filled in the filler cavity. The tool can realize internal and external heat insulation in a steam injection process, provides an internal steel wire or cable operation channel, and can be matched with a production blanking plug to carry out oil extraction production.

Description

technical field [0001] The present invention relates to the technical field of heat insulation and allowing steel wire or cable operation devices, in particular to a heat insulation straight hole injection-production Y joint and its application method. Background technique [0002] In the steam huff and puff production of heavy oil in the oilfield, generally in the same well, the steam injection and oil production stages are respectively lowered into two strings for injection and oil production. If it is designed as an integrated steam injection and oil production string, the temperature inside the tubing will be very high during the steam injection process, generally around 370°C. Offshore oil fields generally use a Y-shaped string structure, even if the upper and lower sides of the Y joint have been insulated. , but if the Y joint does not have the heat insulation function, then during the steam injection process, the outside of the Y joint will be very close to or reach t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/24E21B17/02
CPCE21B43/24E21B17/02Y02E10/10
Inventor 张成富柳沣洵刘全刚刘海英刘志龙邹琦董世超焦俊青张凤辉沈琼
Owner CNOOC ENERGY TECH & SERVICES
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