CN104818961B - Thick oil thermal extraction temperature control heating power well washing switch - Google Patents

Abstract

The invention belongs to Petroleum Down-hole Tool, more particularly to a kind of thick oil thermal extraction temperature control heating power well washing switch, central tube（1）On be respectively equipped with multiple well-flushing passages one（8）, multiple well-flushing passages two（9）, multiple well-flushing passages three（12）, central tube（1）Anti-skidding decylization is set with the keyway of upper end（13）, central tube（1）Outside suit sealing shroud（4）, sealing shroud（4）Outside suit temperature control body（3）, well-flushing passage two（9）Upper end, which is provided with starting taper sealing surface, starting taper sealing surface, is equipped with ball sealer（10）, ball sealer（10）Press-fit high temperature stage clip above（11）, high temperature stage clip（11）It is placed in sealing shroud（4）And central tube（1）In the cavity that top is formed, sealing shroud（4）Upper end inner side and central tube（1）Between, central tube（1）Outside and sealing shroud（4）Between use high-temperature seal ring two（7）Sealing, hot wash liquid will not get into stratum, particularly miss serious oil reservoir during thick oil thermal extraction temperature control heating power well washing switch low-pressure opening, effectively prevent oil layer pollution, be not turned on during steam injection, reduce heat-energy losses, improve steam injection efficiency.

Description

Thick oil thermal extraction temperature control heating power well washing switch

Technical field

The invention belongs to Petroleum Down-hole Tool, more particularly to a kind of thick oil thermal extraction temperature control heating power well washing switch.

Background technology

Thick oil thermal extraction is in production process is handled up in steam injection, it is necessary to which supporting well washing switch, carries out daily well-washing wax-cleaning, removes Dirt and sand washing work, to ensure being smoothed out for thermal production well production, well washing switch is one of indispensable instrument.At present on scene Well washing switch mainly has two kinds, and one is differential unfolding mode, and using can only be opened during well-flushing with the well-flushing hydraulic pressure difference of restriction, pressure Difference is too high, starts pressure and is sometime up to 25Mpa, and to the serious thermal production well of formation leakage, hot wash liquid easily enters stratum during hot wash, causes Oil layer pollution, for low pressure and low permeability geological conditions, the high pressure of washing well process causes water filling and kill-job effect, and hydrothermal solution pours in down a chimney stratum, Venturi is blocked, stratum is polluted, reduces oil well output, cause to repair on oil well when serious so that yield convalescence after thermal well flushing It is long, influence crude output；Pressure difference is low, and well washing switch will not be opened, it is difficult to realize well-flushing process；Oil jacket annulus pressure mistake during production Greatly, well washing switch can be caused to be opened accidentally, influences normal production and the plugging effect of oil well.Another is temperature when depending merely on well-flushing Degree is opened, although is overcome the drawbacks of pressure difference is opened, but also understanding outer unlatching during oil well stream-injection, is caused steam to be lost to oil jacket ring Sky, influences steam injection throughput prediction, aggravates vapour losses, and long-term hot wash makes sleeve pipe bear HTHP, influences set tube lifetime.

The content of the invention

It is an object of the invention to overcome above-mentioned technical deficiency there is provided a kind of smooth realization that both can guarantee that well-flushing process, Pollution of the hot wash to stratum is reduced again, and the thick oil thermal extraction temperature control heating power that can shorten the yield convalescence after thermal well flushing is washed Well is switched.

The present invention solve technical problem use technical scheme be：Thick oil thermal extraction temperature control heating power well washing switch includes center Pipe, high-temperature seal ring one, high-temperature seal ring two, fixing pin, be characterized in being respectively equipped with central tube multiple well-flushing passages one, Multiple well-flushing passages two, multiple well-flushing passages three, multiple well-flushing passages three are in central tube radial equipartition, multiple Hes of well-flushing passage two Multiple well-flushing passages one are in center pipe axle to uniform, and between well-flushing passage three and well-flushing passage one, well-flushing passage two leads to well-flushing Corresponded respectively between road one and anti-skidding decylization is set with connection, the keyway of central tube upper end, the outside suit of central tube is close Big envelope, is welded to connect between the upper surface of sealing shroud and anti-skidding decylization, the outside suit temperature control body of sealing shroud, sealing shroud and temperature control Fixed between body with fixing pin, the bottom of well-flushing passage one is blocked with blockage body and sealed, and the outer end of blockage body is placed in sealing shroud It is welded to connect in hole and with wall in temperature control body, the upper end of well-flushing passage two is provided with starting taper sealing surface, starting taper sealing surface equipped with sealing Press-fit high temperature stage clip above ball, ball sealer, high temperature stage clip is placed in the cavity that sealing shroud and central tube top are formed, high temperature stage clip Upper end be placed on the interior shoulder of sealing shroud, sealed between central tube and blockage body with high-temperature seal ring one, sealing set upper side in Sealed between side and central tube, on the outside of central tube between sealing shroud with high-temperature seal ring two.

The beneficial effects of the invention are as follows：Hot wash liquid will not be got into during thick oil thermal extraction temperature control heating power well washing switch low-pressure opening Stratum, particularly miss serious oil reservoir, effectively prevent oil layer pollution, efficiently solve the nothing because of stratum severe leakage The problem of method carries out normal hot-washing wax remover, it is ensured that oil well is normally produced, realizes high and stable yields；It is not turned on during steam injection, reduces heat energy Loss, improves steam injection efficiency, extends set tube lifetime, reduces production cost；Well-flushing temperature is opened, it is ensured that well-flushing temperature, is improved Well-flushing efficiency.

Brief description of the drawings

Illustrated below in conjunction with accompanying drawing with embodiment.

Fig. 1 is thick oil thermal extraction temperature control heating power well washing switch structure chart.

View when Fig. 2 is Fig. 1 well-flushing.

View when Fig. 3 is Fig. 1 steam injections.

Fig. 4 is Fig. 1 concrete application schematic diagrames.

In figure, 1- central tubes；2- fixing pins；3- temperature control bodies；4- sealing shrouds；5- high-temperature seal rings one；6- blockage bodies；7- High-temperature seal ring two；8- well-flushing passages one；9- well-flushing passages two；10- ball sealers；11- high temperature stage clips；12- well-flushing passages three； The anti-skidding decylizations of 13-；14- sleeve pipes；15- suction pumps；16- oil pipes；17- packer for high-temp thermal recovery.

Embodiment

Embodiment, referring to the drawings 1 ~ 4, four are respectively equipped with the central tube 1 of thick oil thermal extraction temperature control heating power well washing switch Well-flushing passage 1, four well-flushing passages 29, four well-flushing passages 3 12, radial direction of four well-flushing passages 3 12 in central tube 1 Uniformly, four well-flushing passages 29 and four well-flushing passages 1 are in the axially uniform of central tube 1, and well-flushing passage 3 12 is led to well-flushing Between road 9, correspond and connect respectively between well-flushing passage 29 and well-flushing passage 1.It is equipped with the keyway of the upper end of central tube 1 Anti-skidding decylization 13, anti-skidding decylization 13 is sleeved on central tube 1, the outside suit sealing shroud 4 of central tube 1, the upper surface of sealing shroud 4 It is welded to connect between anti-skidding decylization 13.The outside suit temperature control body 3 of sealing shroud 4, with fixation between sealing shroud 4 and temperature control body 3 Pin 2 is fixed, the bottom of well-flushing passage 1 with blockage body 6 block seal, the outer end of blockage body 6 be placed in the hole of sealing shroud 4 and with The inwall of temperature control body 3 is welded to connect.The upper end of well-flushing passage 29, which is provided with starting taper sealing surface, starting taper sealing surface, is equipped with ball sealer 10, Ball sealer 10 press-fits high temperature stage clip 11 above, and high temperature stage clip 11 is placed in the cavity that sealing shroud 4 and the top of central tube 1 are formed, high The upper end of temperature and pressure spring 11 is placed in the upper end of sealing shroud 4 on shoulder.It is close with high-temperature seal ring 1 between central tube 1 and blockage body 6 Envelope, using high-temperature seal ring 27 close between sealing shroud 4 between the upper end of sealing shroud 4 inner side and center heart pipe 1, on the outside of central tube 1 Envelope.

The course of work of thick oil thermal extraction temperature control heating power well washing switch is：In use, thick oil thermal extraction temperature control heating power well-flushing Switch is placed in the middle of oil pipe 16, and the top of the switch is connected by oil pipe 16 with suction pump 15, and packer for high-temp thermal recovery 17 is set The space between sleeve pipe 14 and oil pipe 16 is blocked afterwards, and oil reservoir up and down is separated.During well-flushing, flushing fluid is from oil pipe 16 and covers Annular space injection between pipe 14, when reaching the switch, temperature rise, the radial and outward deformation of temperature control body 3 bending drives blockage body 6 Outer to move, well-flushing passage 1 is opened wide, and flushing fluid is made after well-flushing passage 1 enters well-flushing passage 29 in the pressure of flushing fluid Under, ball sealer 10 moves up compression high temperature stage clip 11, opens well-flushing passage 29, and flushing fluid continues through well-flushing passage 3 12 and entered Enter in central tube 1, implement well-flushing；At the end of well-flushing, stop feed flushing fluid, temperature in wellbore reduction, temperature control body 3 radially-inwardly becomes Shape is simultaneously restored, and is driven in blockage body 6 and is moved, and well-flushing passage 1 is closed, the resilience of high temperature stage clip 11, and compressing ball sealer 10 resets, well-flushing Passage 29 is closed, and completes well-flushing process.During steam injection, high-temperature steam enters sealing shroud 4 and central tube 1 by well-flushing passage 3 12 Formed in annular space, under steam injection pressure and the elastic force collective effect of high temperature stage clip 11, ball sealer 10 is pressed on starting taper sealing surface, really Protect well-flushing passage 29 close, prevent vapours from missing, improve steam injection efficiency, steam injecting temperature effect under, the radial direction of temperature control body 3 to Outer bending, drives blockage body 6 is outer to move, well-flushing passage 1 is opened wide, but because well-flushing passage 29 is closed, do not interfere with steam Leakage and reduction steam injection efficiency, after steam injection, temperature reduction, temperature control body 3 is deformed radially inwardly recoverys, drives shifting in blockage body 6, Well-flushing passage 1 is closed, and well-flushing passage 29 is also closed under the effect of high temperature stage clip 11, it is ensured that normal production.

Claims (1)

1. a kind of thick oil thermal extraction temperature control heating power well washing switch, including central tube（1）, high-temperature seal ring one（5）, high-temperature seal ring Two（7）, fixing pin（2）, it is characterised in that central tube（1）On be respectively equipped with multiple well-flushing passages one（8）, multiple well-flushing passages Two（9）, multiple well-flushing passages three（12）, multiple well-flushing passages three（12）In central tube（1）Radial equipartition, multiple well-flushing passages two （9）With multiple well-flushing passages one（8）In central tube（1）It is axially uniform, well-flushing passage three（12）With well-flushing passage one（8）Between, Well-flushing passage two（9）With well-flushing passage one（8）Between respectively correspond connection, central tube（1）It is set with the keyway of upper end Anti-skidding decylization（13）, central tube（1）Outside suit sealing shroud（4）, sealing shroud（4）Upper surface and anti-skidding decylization（13）Between It is welded to connect, sealing shroud（4）Outside suit temperature control body（3）, sealing shroud（4）With temperature control body（3）Between use fixing pin（2）Gu It is fixed, well-flushing passage one（8）Bottom blockage body（6）Closure sealing, blockage body（6）Outer end be placed in sealing shroud（4）Hole in simultaneously With temperature control body（3）Inwall is welded to connect, well-flushing passage two（9）Upper end is provided with starting taper sealing surface, starting taper sealing surface equipped with sealing Ball（10）, ball sealer（10）Press-fit high temperature stage clip above（11）, high temperature stage clip（11）It is placed in sealing shroud（4）And central tube（1）On In the cavity that portion is formed, high temperature stage clip（11）Upper end be placed in sealing shroud（4）Interior shoulder on, central tube（1）With blockage body（6） Between use high-temperature seal ring one（5）Sealing, sealing shroud（4）Upper end inner side and central tube（1）Between, central tube（1）Outside with it is close Big envelope（4）Between use high-temperature seal ring two（7）Sealing.