CN208619095U

CN208619095U - A kind of coating insulated tubing

Info

Publication number: CN208619095U
Application number: CN201821068008.1U
Authority: CN
Inventors: 魏祎博
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-07-06
Filing date: 2018-07-06
Publication date: 2019-03-19
Anticipated expiration: 2028-07-06

Abstract

The utility model discloses a kind of coating insulated tubings, including box cupling, oil pipe, box cupling to be connected with oil pipe；The box cupling outer wall is coated with box cupling outer wall coating, and box cupling inner wall is coated with box cupling inside coating, and the oil-pipe external wall is coated with oil-pipe external wall coating, and tube inner wall is coated with tube inner wall coating.Utility model has the advantages that having excellent thermal insulation, heat insulation is significant, and ablation resistance is good.

Description

A kind of coating insulated tubing

Technical field

The utility model relates to oil field heat-insulating technique field, in particular to a kind of coating insulated tubing.

Background technique

Field of heavy oil thermal recovery in oil field, in order to reduce the heat loss of steam injection well, traditional double-layer vacuum heat insulated oil pipe is obtained

To extensive use.Steamed well use insulated tubing at least following two reason: (1) safety: steam injection well by Casing and oil pipe composition, are fixed between casing and stratum with cement.Oil pipe among casing, infuse out of oil pipe by high temperature and high pressure steam Enter and flows to oil reservoir.If oil pipe does not have good heat-insulation and heat-preservation measure, steam amount of heat can be transmitted to casing, bushing temperature liter The expansion that height generates will be such that the cement sheath outside casing damage or casing is destroyed, so that the well be made not to be available.(2) economical Property: steam is injected according to common blank tubing, it is dry when steam will be made to arrive at oil reservoir entrance along the thermal loss of entire pit shaft Degree sharply becomes smaller, or even becomes hot water, and thermal recovery significant effect reduces.The common feature of heat-insulated oil reservoir is: by steel inner tube and Outer tube is composed, and has heat-barrier material of good performance between inner and outer pipes, heat-barrier material not will receive brokenly during lower oil tube Bad and influence.Inner and outer pipes cause greatly different axial elongations because of temperature difference at runtime, and preceding two class compensates work by bellows With prestressing force insulated tubing is then compensated by the prestressing force of inner and outer pipes.By the actual use of many years, prestressing force insulated tubing It is widely used, inside and outside ripple insulated tubing is then rarely employed.Traditional double-layer vacuum heat insulated oil pipe is at high cost, applies Work difficulty is big, vacuum keeps difficult and difficult in maintenance for a long time, with the extension in oil well production period, the thermal insulation of insulated tubing It can decline, wellbore heat loss increases.

Current common vacuum heat-insulation oil pipe primary structure is first to twine one layer of aluminium foil in insulated tubing outer wall of inner tube first, so One layer of glass wool cloth is twined on aluminium foil afterwards, then twines second layer aluminium foil, second layer glass cloth, is twined until by design requirement to required The number of plies.After winding, centre is vacuumized, with reduce because heat convection caused by air and it is thermally conductive caused by heat transfer, Make the reduction of steam injection heat loss, improves the quality of steam that can be injected depth and inject oil reservoir.

But above-mentioned vacuum heat-insulation is related to be had the disadvantage that

1. at high cost.Vacuum heat-insulation oil pipe needs for the air in thermal insulation layer to be evacuated, and the required length of insulated tubing Degree is very long, thus cost is very high.

2. service life is short.It has relevant gas in steam injection process to generate and discharge, this reduces vacuum heat-insulation oil The vacuum degree of pipe thermal insulation layer reduces the service life of vacuum heat-insulation oil pipe to a certain extent.

3. lower oil well is difficult.The thermal insulation layer of vacuum heat-insulation oil pipe is evacuated, and oil well depth is mostly left in several kms The right side, by under vacuum heat-insulation oil pipe into oil well it is relatively difficult.

Utility model content

The utility model in view of the drawbacks of the prior art, provides a kind of coating insulated tubing, can effectively solve above-mentioned Problem of the existing technology.

In order to realize that the above purpose of utility model, the technical solution that the utility model is taken are as follows:

A kind of coating insulated tubing, including box cupling 2, oil pipe 7, box cupling 2 are connected with oil pipe 7；

2 outer wall of box cupling is coated with box cupling outer wall coating 1, and 2 inner wall of box cupling is coated with box cupling inside coating 3

7 outer wall of oil pipe is coated with oil-pipe external wall coating 6, and 7 inner wall of oil pipe is coated with tube inner wall coating 10.

Further, binder course A4,2 inner wall of box cupling and box cupling are equipped between 2 outer wall of box cupling and box cupling outer wall coating 1 Binder course B5 is equipped between inside coating 3.

Further, binder course C8,7 inner wall of oil pipe and oil pipe are equipped between 7 outer wall of oil pipe and oil-pipe external wall coating 6 Binder course D9 is equipped between inside coating 10.

Further, binder course A4, binder course B5, binder course C8 and binder course D9 material are Al/Ni metal powder.

Further, the box cupling outer wall coating 1, box cupling inside coating 3, oil-pipe external wall coating 6 and tube inner wall coating 10 coating materials selected are ZrO2 ceramic material.

Further, binder course A4, binder course B5, binder course C8, binder course D9 with a thickness of all be 0.8mm.

Further, the box cupling outer wall coating 1, box cupling inside coating 3, oil-pipe external wall coating 6 and tube inner wall coating 10 with a thickness of all be 0.8mm.

Compared with prior art utility model has the advantages that Coating combination is close, coating density is high, with higher Bond strength.Hard, fine and close, the resistant to high temperatures combustion gas of coating is washed away excellent with thermal shock resistance.With excellent thermal insulation, heat-insulated effect Fruit is significant, and ablation resistance is good.Apparent heat conductivity 0.02≤λ≤0.04 of oil pipe, heat-proof quality grade reach C grades.

Detailed description of the invention

Fig. 1 is the utility model embodiment structural schematic diagram；

Fig. 2 is the utility model embodiment A-A sectional view.

Specific embodiment

For the purpose of this utility model, technical solution and advantage is more clearly understood, develop simultaneously implementation referring to the drawings Example, is described in further details the utility model.

As shown in Figure 1, 2, a kind of coating insulated tubing, including box cupling 2, oil pipe 7, box cupling 2 are connected with oil pipe 7.

2 outer wall of box cupling is coated with box cupling outer wall coating 1, and 2 inner wall of box cupling is coated with box cupling inside coating 3.

Binder course A4,2 inner wall of box cupling and box cupling inside coating 3 are equipped between 2 outer wall of box cupling and box cupling outer wall coating 1 Between be equipped with binder course B5.

Binder course C8,7 inner wall of oil pipe and tube inner wall coating are equipped between 7 outer wall of oil pipe and oil-pipe external wall coating 6 Binder course D9 is equipped between 10.

The painting that the box cupling outer wall coating 1, box cupling inside coating 3, oil-pipe external wall coating 6 and tube inner wall coating 10 are selected Layer material is ZrO2 ceramic material, is all Al/Ni metal powder in conjunction with layer material, above-mentioned coating with a thickness of 0.8mm, coating In the thickness, Coating combination is close, and coating density is high, bond strength with higher.Hard, fine and close, the resistant to high temperatures combustion of coating Gas washes away excellent with thermal shock resistance.Prepared ZrO2 heat insulating coat has excellent thermal insulation, and heat insulation is significant.And The ablation resistance of ZrO2 ceramic coating is fairly good.After outer wall of inner tube plates the coating respectively, the apparent heat conductivity 0.02 of oil pipe ≤ λ≤0.04, heat-proof quality grade reach C grades, have excellent thermal insulation, and heat insulation is obvious.

Those of ordinary skill in the art will understand that the embodiments described herein, which is to help reader, understands this reality With novel implementation method, it should be understood that the protection scope of the utility model is not limited to such special statement and implementation Example.Those skilled in the art can make according to the technical disclosures disclosed by the utility model various does not depart from this reality With novel substantive various other specific variations and combinations, these variations and combinations are still in the protection scope of the utility model It is interior.

Claims

1. a kind of coating insulated tubing, including box cupling 2, oil pipe 7, box cupling 2 are connected with oil pipe 7；It is characterized by: the box cupling 2 outer walls are coated with box cupling outer wall coating 1, and 2 inner wall of box cupling is coated with box cupling inside coating 3, and 7 outer wall of oil pipe is coated with oil-pipe external wall painting Layer 6,7 inner wall of oil pipe is coated with tube inner wall coating 10；

Binder course A4 is equipped between 2 outer wall of box cupling and box cupling outer wall coating 1, between 2 inner wall of box cupling and box cupling inside coating 3 Equipped with binder course B5；

Be equipped with binder course C8 between 7 outer wall of oil pipe and oil-pipe external wall coating 6,7 inner wall of oil pipe and tube inner wall coating 10 it Between be equipped with binder course D9.

2. a kind of coating insulated tubing according to claim 1, it is characterised in that: binder course A4, binder course B5, binder course C8 and binder course D9 material are Al/Ni metal powder.

3. a kind of coating insulated tubing according to claim 2, it is characterised in that: in the box cupling outer wall coating 1, box cupling The coating material that wall coating 3, oil-pipe external wall coating 6 and tube inner wall coating 10 are selected is ZrO2 ceramic material.

4. a kind of coating insulated tubing according to claim 3, it is characterised in that: binder course A4, binder course B5, binder course C8, binder course D9 with a thickness of all be 0.8mm.

5. a kind of coating insulated tubing according to claim 4, it is characterised in that: in the box cupling outer wall coating 1, box cupling Wall coating 3, oil-pipe external wall coating 6 and tube inner wall coating 10 with a thickness of being all 0.8mm.