CN2688893Y - Two-purpose thermal insulative pipe for injecting steam and extracting oil - Google Patents

Abstract

A two-purpose thermal insulative pipe for injecting steam and extracting oil is applied to the underground oil pipe which is used for the steam injection oil extraction process of thick oil. The two-purpose thermal insulative pipe for injecting steam and extracting oil comprises an inner pipe, an outer pipe, counter radiation heat shielding screens, a supporter, and a correction body, and the hollow chamber between the inner pipe and the outer pipe is pumped into vacuum; both end parts of the inner pipe is formed into shape of bellmouthing by thickening and expending processes, and the outer edge is welded with the inner wall of the outer pipe; three layers of counter radiation heat shielding screens are uniformly distributed in the space formed between the inner pipe and the outer pipe; helical supporters make of high temperature-resistant material are arranged between every two layers and between the inner layer and the inner pipe along the axial direction; circular hoops which perform functions of stabilisation are arranged respectively on the upper and the lower ends of the outer layer of the heat shielding screen; the tubular correction bodies and the pad heads which are made of flame-proof sintered clay sheathed in the pipe are uniformly distrubuted between the inner and the outer pipe, at the height of the straight part of the inner pipe and along the radical direction. The damage of the pipe body intensity is reduced, and the damage of the heat conduction is reduced too; both ends of the outer pipe chooses trapezoidal threads, so that the pipe end intensity is improved, and the service life of the pipe is prolonged too.

Description

The steam injection dual-purpose insulating tube that recovers the oil

Technical field

The utility model relates to a kind of steam injection dual-purpose insulating tube that recovers the oil, and is a kind of vitals of oil production equipment, is applicable to and makes the down-hole oil tube that the thick oil filling steam-assisted recovery is used.

Background technology

Existing insulating tube is annealed so the junction is a surrounding structure because inner and outer pipe is connected through the connecting ring multiple welding, causes the strength of materials, hardness obviously to descend, the also corresponding decline of intensity that is threaded of this place; Because inner and outer pipe connects and fix through end metal supporting rings and connecting ring, thus heat transfer soon, heat waste is big; Because it is to fix by support ring that antiradiation hides heat shielding, insulating tube is vertical duty, and when interior pipe was subjected to thermal stretching, this screenings heat shielding then deformed, and causes it with other layer or directly contact with outer tube, and has formed the path that conducts heat, and thermal loss is increased.

Summary of the invention

At the technical problem of above-mentioned existence, the utility model provides a kind of steam injection dual-purpose insulating tube that recovers the oil;

Solving the problems of the technologies described above the technical measures of being taked is: the utility model is by interior pipe, outer tube, antiradiation hides heat shielding, supporter, centralizer body, internally, cavity between outer tube vacuumizes formation, horn mouth is arranged at interior pipe both ends, its outer directly and outer tube be connected, be provided with uniform antiradiation in the space that both form and hide heat shielding, per two interlayers, be provided with low heat conduction vertically between nexine and interior pipe, the helical form supporter that exotic material is made, on the outer screening heat shielding, following two ends have been respectively equipped with the circumferential band of stabilization, interior, between outer tube, on the height of interior pipe straightway and radially be laid with the tubulose centralizer body and be socketed on nonmetal margin in the pipe, in, vacuumize in the outer lumen to stop conduction of heat; The outer tube two ends are provided with trapezoidal external screw thread and link to each other with down-hole oil tube, box cupling or flowline respectively;

The utility model has the advantages that:, obviously reduced the loss of body intensity because interior pipe outer is direct and the disposable welding of outer tube is connected; Owing to be provided with helical form supporter and nonmetal margin, reduced heat conduction loss, a joint insulating tube can reduce heat waste 12%-15% as calculated; Because trapezoidal thread has been selected at the outer tube two ends for use, and pipe end intensity is increased than the canine tooth screw thread, has also improved the application life of pipe;

Description of drawings

Fig. 1 be the utility model structure axially partly cut open schematic diagram, Fig. 2 is the enlarged drawing of I among Fig. 1, Fig. 3 is the C-C sectional view of Fig. 1, Fig. 4 is the D-D sectional view of Fig. 1.

The specific embodiment

In conjunction with the accompanying drawings the utility model formation and embodiment are described as follows, the formation of this insulating tube is: the interior pipe 7 both ends thick support bulging of 150mm place pier becomes horn mouth 9, its outer and outer tube 2 inwall welds 11, in, be evenly equipped with three layers of antiradiation in the space that outer tube forms and hide heat shielding 3, per two interlayers, be provided with low heat conduction vertically between nexine and interior pipe, the helical form supporter 4 that exotic material is made, on the outer screening heat shielding 3, following two ends have been respectively equipped with the circumferential band 10 of stabilization, interior, between outer tube, on the height of interior pipe straightway and radially be laid with tubulose centralizer body 6 and be socketed on the margin 5 (radially being provided with 3) that the fire-resistant sintered clay in the pipe is made, in, vacuumize in the outer lumen to stop conduction of heat; The outer tube two ends are provided with trapezoidal external screw thread 8 and link to each other with down-hole oil tube, box cupling 1 or flowline respectively; The projection 1a that the middle part of box cupling 1 inwall is provided with the twice annular seals;

The external diameter of outer tube 2 is φ 127.3, wall thickness 6.43, outer pipe range 9.6m, interior Guan Jun is than the short 60-80mm of outer tube, and the external diameter of interior pipe 7 is φ 88.9, wall thickness 5.4, and it is red copper foil or the aluminium foil of coefficient of blackness≤0.02-0.04 that antiradiation hides heat shielding 3, wall thickness is 0.05-0.08mm, its effect is to reduce conduction of heat, reduces heat waste, and the gap that antiradiation hides heat shielding layer and interlayer is 3-4mm; Supporter 4 is φ 3-4 for its diameter of multiply super glass wool, and pitch: promptly the bundle of superfine glass cotton cord is around spacing 150mm;

Approximate formula according to apparent heat conductivity in the SY/T5324-94 appendix A $\mathrm{\λ}=\frac{Q\ln \frac{D_3}{D_2}}{2\mathrm{\πL}(t_1-t_4)}$

In the formula: λ-apparent heat conductivity, W/ (m ℃);

The effective stable state heating power of Q-test section, W;

External diameter of pipe in the D2-, mm;

The D3-outer tube diameter, mm;

The effective heated length of L-test section, m;

t ₁-inner tube wall temperature, ℃;

t ₄-outer tube outer wall temperature, ℃;

According to: heat in the interior tube chamber to 350 ℃, recorded relevant data in constant temperature 2-4 hour:

t ₁：350℃，t ₄：45℃，Q＝IV?I＝3.2?V＝170，D3＝114.44mm?D2＝88.9mm

The substitution approximate formula calculates: λ=0.0032 (W/m ℃); Through repeatedly test, data 0.006＞λ 〉=0.002 of λ, promptly E level level has 80%, has reached the requirement of SY/T5324-94 standard.

Claims (5)

1, a kind of steam injection dual-purpose insulating tube that recovers the oil, by interior pipe, outer tube, antiradiation hides heat shielding, supporter, centralizer body, internally, cavity between outer tube vacuumizes formation, it is characterized in that, the thick support bulging of interior pipe both ends pier becomes horn mouth, its outer and outer tube wall welding, in, be evenly equipped with three layers of antiradiation in the space that outer tube forms and hide heat shielding, per two interlayers, be provided with low heat conduction vertically between nexine and interior pipe, the helical form supporter that exotic material is made, on the outer screening heat shielding, following two ends have been respectively equipped with the circumferential band of stabilization, interior, between outer tube, on the height of interior pipe straightway and radially be laid with the tubulose centralizer body and be socketed on the margin that the fire-resistant sintered clay in the pipe is made.

2, the steam injection according to claim 1 dual-purpose insulating tube that recovers the oil is characterized in that the outer tube two ends are provided with trapezoidal external screw thread and link to each other with down-hole oil tube, box cupling or flowline respectively.

3, the steam injection according to claim 1 dual-purpose insulating tube that recovers the oil is characterized in that the middle part of box cupling inwall is provided with the projection of twice annular.

According to claim 1, the 2 or 3 described steam injections dual-purpose insulating tube that recovers the oil, it is characterized in that 4, outer external diameter of pipe is that φ 127.3, wall thickness are 6.43, pipe range is 9.6m; Interior external diameter of pipe is that φ 88.9, wall thickness are 5.4, interior length of tube is than the short 60-80mm of outer tube.

According to claim 1, the 2 or 3 described steam injections dual-purpose insulating tube that recovers the oil, it is characterized in that 5, the thickness that antiradiation hides heat shielding is 0.05-0.08mm.

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