Background technique
Oil well paraffinication is there are problems that in oilfield development process for a long time, when crude oil is extracted into ground from underground, due to moltenSolve gas evolution and expansion and gradually decrease crude oil temperature, wax just from crude oil by molecular weight size order crystallization analyseOut, and then it is deposited on tube inner wall, pit shaft is caused to narrow, oil well output reduces, and oil pipe can be also blocked when serious and causes oilWell stops production.Hot-washing wax remover technology is to pass through the circulation of hot fluid in the wellbore using the flowing material after heating, such as water or oilWellbore fluids are delivered heat to, the temperature of wellbore fluids is improved, so that after wax deposit fusing in being dissolved in crude oil, to reach wax removalPurpose.
When carrying out hot-washing wax remover, hot wash liquid, which is directly injected into oil reservoir, in order to prevent causes oil layer pollution, needs in oil pipeIn be connected into packer, for oil jacket annulus to be shut.The Chinese invention patent of Publication No. CN1077514A discloses a kind of oilThe dewaxing method of well conduit and a kind of packer for C and WK, it is packer for C and WK of connecting in the oil pick-up tube of wax deposition pars infrasegmentalis, soHot wash liquid is injected into oil jacket annulus from well head afterwards, when the higher wash liquid stream of temperature is into packer, in the temperature of cleaning solutionAnd pressure insulates oil jacket annulus while act on lower unlatching by-passing valve, so that hot wash fluid-tight be made to be interposed between a certain position of oil wellOn, and the wax deposition section in oil pick-up tube is flowed directly by the by-passing valve of packer, hot wash liquid is molten by the wax of condensation along tube inner wallIt solves and well head is discharged.
When the dewaxing method realizes injection hot wash liquid, hot wash liquid is directly entered wax deposition section in oil pipe without shaft bottom, contractingThe short process of hot wash liquid, improves wax removal effect.The principle that sets of its packer for C and WK is: list is provided on packer for C and WKThermostat valve and expander are flowed, hot wash liquid makes single temperature-sensitive element expanded by heating flowed in thermostat valve open ball-and-seat first, works as hot washLiquid by it is single flow thermostat valve and flow through expander when, the inflating medium expanded by heating in expander to make gum cover expand, finally byGum cover seals oil jacket annulus.
However, due to above-mentioned packer by temperature realization set, practice discovery, the temperature need to reach 60 DEG C withOn, and packer need to just be able to achieve and finally set by double expansion, and it is swollen to be first that the temperature-sensitive element for singly flowing in thermostat valve is heatedSingle stream thermostat valve could be opened after swollen to make hot wash liquid flow thermostat valve by single, then hot wash liquid makes the expansion in expander againMedium expanded by heating realizes setting for packer.Therefore, it is warming up to before double expansion is set this period in hot wash, will had veryBig a part of hot wash liquid enters in oil reservoir, to cause oil layer pollution, the production well production after making hot wash declines to a great extent.
Summary of the invention
The purpose of the present invention is to provide a kind of pumping pipe strings with hot-washing wax remover function, to solve to exist in the prior artThe problem of hot wash liquid enters oil reservoir and causes oil layer pollution when carrying out hot-washing wax remover.
In order to solve the above-mentioned technical problem, it is adopted the following technical scheme that in the present invention
A kind of pumping pipe string with hot-washing wax remover function, including the oil pipe vertically extended, the wax deposition section of oil pipeLower part string is equipped with packer, and the bottom of oil pipe is connected with oil well pump, realization when building the pressure in oil pipe is provided on the packerWhat is set sets structure.
The packer includes central tube, and the structure that sets includes top inlet opening on centrally disposed pipe and setsIt is placed in outside central tube in setting piston on the inlet opening corresponding position of top, above sets and be provided with compression packing element below piston, instituteIt states and sets piston with oil liquid makes to compress what packing element was not compressed after the entrance of top inlet opening during normal production in oil well pumpBalance position and while building the pressure in oil pipe, break balance and to compression packing element pressure to realize the position that sets set, the packingDevice further includes the holding structure for making its holding set state after compression packing element is realized and set.
It is described to set that structure further includes lower part inlet opening on centrally disposed pipe and to be set to central tube outer in lower partPiston is set under inlet opening corresponding position, set under described piston have oil well pump during normal production oil liquid from lower part inlet openingThe holding position that piston is maintained at the balance position is set on making after.
The holding structure includes the lock ring being connected to outside the lock tube for setting piston lower portion and centrally disposed pipe, lockIt is directed downwardly to realize the stuck lock tooth of interlocking with cusp upward that cusp is respectively arranged on set and lock ring.
The packer further includes the unlocking structure for being unlocked to lock tube and lock ring.
The unlocking structure includes the gap for can be compressed lock ring being set on lock ring and is set to centerThe opposite end of deblocking piston below lock ring outside pipe, deblocking piston and lock ring is provided with works in coordination when unsealing piston stroking upwardSo that the compressed tapered surface of lock ring.
The lower end of lock tube is provided with adjusting set, and the compression packing element is arranged in the lower section of adjusting set, central tube, lock tube, onIt sets piston and adjusting set constitutes ring cavity, the deblocking piston and lock ring are respectively positioned in ring cavity, and oil supplying sleeve is offered on lock tubeHot wash liquid in annular space enters the hot wash liquid inlet in ring cavity, and the deblocking piston, which has, to be passed through in hot wash liquid by oil jacket annulusUplink after hot wash liquid inlet enters in ring cavity is so that lock ring and lock tube realize the solution lock-bit of unlock.
Under set the top of piston and be fixedly connected with adjusting set, under set and be provided with hot wash liquid between piston and central tubeChamber, hot wash sap cavity are connected to the ring cavity, the lower part of the compression packing element, under set the outside of piston and be provided with expansion packing element,Expansion packing element and under set and be provided with expansion cavity between piston, under set and offer connection hot wash sap cavity and expansion cavity on pistonPass through mouth.
Spring is provided in the ring cavity above lock ring, there is the support for being supported to spring on lock ringFace.
The upper end of the packer is connected with well washing switch, and the bottom of the oil well pump is linked in sequence and has screen casing and silk plug.
The beneficial effects of the present invention are: it is provided on packer when building the pressure in oil pipe and realizes that is set sets structure,Thus by way of building the pressure in oil pipe, packer premature setting can be made before injecting hot wash liquid into oil jacket annulus,It after packer setting is good, reinjects hot wash liquid and carries out hot-washing wax remover, at this moment there will be no any hot wash liquid to enter in oil reservoir, realShow no pollution, protects oil reservoir.Simultaneously because packer string is located at wax deposition pars infrasegmentalis, such hot wash liquid can be directly enteredWax deposition section, therefore heat loss is seldom, thermal energy is fully utilized, and improves the effect of hot-washing wax remover, and hot wash liquid measure used is few, hotIt is high-efficient to wash down wax.
Specific embodiment
A kind of implementation of the pumping pipe string with hot-washing wax remover function is for example shown in Fig. 1 ~ Fig. 2 in the present invention, including along upper26 lower part of the wax deposition section string of the oil pipe 19 that lower direction extends, oil pipe 19 is equipped with packer 21, and the upper end of packer 21, which is connected with, to be washedWell switch 20, the bottom of oil pipe 19 are connected with oil well pump 23, and the bottom of oil well pump 23 is linked in sequence and has screen casing 24 and silk plug 25.
Packer 21 includes central tube 3, is provided with when building the pressure in oil pipe 19 on packer and realizes that is set sets structure,It is described to set that structure includes top inlet opening 15 on centrally disposed pipe 3 and to be set to central tube 3 outer in top inlet openingPiston 2 is set on 15 corresponding positions, above sets the internal diameter of piston 2 for two up big and down small different diameters, in two diametersThere are two sealing rings for each dress, above set and are formed with plunger shaft one between piston 2 and central tube 3, the top inlet opening 15 is located atIt is connected between upper-lower seal circle and with plunger shaft one.On set the lower part of piston 2 and be fixedly connected with lock tube 5, the lower end of lock tube 5 is setIt is equipped with adjusting set 10, adjusting set 10 is L-shaped, and the vertical edge of L-type adjusting set 10 is located at the inside of lock tube 5, horizontal sides and lock tube 5Block cooperation, the moving limit moved down for limiting lock tube 5, lock tube 5, central tube 3, on set piston 2 and adjusting set10 constitute ring cavity.
The lower section of adjusting set 10 be provided with compression packing element 11, it is described on set piston 2 have oil well pump during normal productionOil liquid enters after plunger shaft one balance position and build the pressure in oil pipe for making to compress that packing element 11 is not compressed from top inlet opening 15When break balance and to compression packing element 11 pressure to realize that is set sets position.The structure that sets further includes centrally disposed pipeLower part inlet opening 17 on 3 and be set to that central tube 3 is outer to set piston 13 under 17 corresponding position of lower part inlet opening, under setPiston 13 is the longer round body of a length, and the upper end is threadedly coupled with the vertical edge of adjusting set 10, lower end be located at lower part intoThe top of fluid apertures 17, and it is provided with sealing ring on the inner headed face of lower end, it is sealed with the upper surface of lower part inlet opening 17 formation.CenterThe outer lower thread in lower part inlet opening 17 of pipe 3 is connected with lower contact 14, under set and be formed between piston 13 and lower contact 14Plunger shaft two, lower part inlet opening 17 are connected to plunger shaft two, and piston 13 is set under described with oily during normal production in oil well pumpLiquid enters after plunger shaft two holding position for making to set piston 2 and being maintained at the balance position from lower part inlet opening 17.Central tube 3Threaded upper ends are connected with top connection 1, and packer is located in oil pipe by top connection 1 and the string of lower contact 14.
Packer further includes the holding structure that the state of setting is kept it in after compression packing element 11 is realized and set, the guarantorHolding structure includes lock tube 5 and the lock ring being fixed at outside central tube 6, and lock ring 6 is located in ring cavity, is divided on lock tube 5 and lock ring 6It is directed downwardly to realize the stuck lock tooth of interlocking with cusp upward that it is not provided with cusp.It is arranged in the ring cavity in the top of lock ring 6There is spring 4, there is the supporting surface for being supported to spring 4, which is the upper surface of lock ring 6, spring on lock ring 64 withstand on its lower end on the supporting surface of lock ring 6 and in pre-compressed state.
Packer further includes the unlocking structure for being unlocked to lock tube 5 and lock ring 6, and the unlocking structure includes settingIn the gap 29 on lock ring 6 for can be compressed lock ring 6 and the solution for being located at 6 lower section of lock ring being set to outside central tube 3The opposite end of envelope piston 8, deblocking piston 8 and lock ring 6, which is respectively arranged with, works in coordination when unsealing 8 uplink of piston so that lock ring 6Compressed inner conical surface 30 and male cone (strobilus masculinus) 31, after gap 29 is compressed, the outer diameter of lock ring 6 becomes smaller, between lock tube 5 and lock ring 6Lock tooth release it is stuck, to realize unlock.The internal diameter for unsealing piston 8 is two up big and down small different diameters, and deblocking is livedIt is formed with plunger shaft three between plug 8 and central tube 3, is provided with sealing on deblocking piston 8 and the binding face up and down of central tube 3It encloses, the middle part inlet opening 16 between upper-lower seal circle with plunger shaft tee joint is offered on central tube 3.It is opened on lock tube 5Enter the hot wash liquid inlet 7 in ring cavity equipped with the hot wash liquid in oil supplying sleeve annular space, deblocking piston 8 has in hot wash liquid by oil jacketUplink after annular space is entered in ring cavity by hot wash liquid inlet 7 is so that lock ring 6 and lock tube 5 realize the solution lock-bit of unlock.
Under set and be provided with hot wash sap cavity between piston 13 and central tube 3, hot wash sap cavity is connected to the ring cavity, under setThe upper end of piston 13 is provided with communication port 9, the lower part of the compression packing element 11, under set the outside of piston 13 and be provided with expansion glueCylinder 12, expand packing element 12 and under set and be provided with expansion cavity between piston 13, under set and offer connection hot wash liquid on piston 13Chamber and expansion cavity pass through mouth 28.
The working principle of pumping pipe string is: during normal production, oil well pump 23 works, and oily liquid in pipe is upper by packerPortion's inlet opening 15 enters in plunger shaft one, and oil liquid applies downward active force to piston 2 is above set, and above sets piston 2 and drives lockSet 5 has the tendency that moving downward, meanwhile, oily liquid in pipe is entered in plunger shaft two by the lower part inlet opening 17 of packer, oilLiquid sets piston 13 under and applies upward active force.In this process, active force etc. downward suffered by piston 2 is above setActive force upward suffered by piston 13 is set under plus upward the sum of the elastic force of spring 4, thus on set piston 2 and be in flatWeighing apparatus position, under set piston 13 and be in holding position, compress packing element 11 and be uncompressed, i.e., packer is in unset state.Oil pipe at this timeOil jacket annulus 18 between 19 and casing 22 is connected to oil reservoir 27, can carry out normally surveying the techniques such as liquid level.
When production a period of time, due to being influenced by factors such as temperature, wax deposition section 26, root will form on the inner wall of oil pipe 19It finds according to actual production, more than which is typically incorporated at 800 meters of well depths, therefore packer is removed with tubing string oneEnter in well, packer is connected directly between below the wax deposition section of oil pipe.Wax deposition section 26 will will affect the yield of oil well after being formed, at this timeIt needs to carry out the operation of hot-washing wax remover, turns down well head production gate first, improve oily overpressure, i.e., build the pressure in realization oil pipe,At this moment oil liquid acts on to set active force downward on piston 2 and will be greater than and acts on down and set effect upward on piston 13Power above sets piston 2 and will will push lock tube 5 and move downward plus upward the sum of the elastic force of spring 4.The lower end of lock tube 5 withstands on tuneIn the horizontal sides of section set 10, when lock tube 5 continues to move downward, compression packing element 11 is compressed, and packer is in and sets state, fromAnd insulate oil jacket annulus 18.When lock tube 5 moves downward to a certain extent, the lock tooth on lock tube 5 and lock ring 6 is mutually buckled, realIt now locks, so that compression packing element 11 is sprung back after preventing the oily overpressure of next step from laying down, packer is made to be maintained at the state of setting.TogetherWhen in this process, oil liquid from middle part inlet opening 16 enter plunger shaft three in, and push deblocking 8 downlink of piston, unseal piston 8It is maintained a certain distance with lock ring 6, preventing deblocking piston 8 from compressing lock ring 6 unlocks lock tube 5 and lock ring 6.
It after compression packing element 11 is set, opens well head and produces gate, keep normal production.Then into oil jacket annulus 18Hot wash liquid is injected, before opening well washing switch 20 and hot wash liquid is made to enter the wax deposition section 26 of oil pipe, hot wash liquid can pass through envelope firstEnter in ring cavity every the hot wash liquid inlet 7 on device, hot high pressure washing lotion applies adjusting set 10 after entering in ring cavity downwardActive force makes to compress packing element 11 and continues to keep setting state, and sets piston 13 under making to be maintained at lower dead point position motionless.TogetherWhen, hot wash liquid is entered in hot wash sap cavity by communication port 9, and the hot wash liquid in hot wash sap cavity enters expansion cavity using by mouth 28 againIn, under the pressure effect of hot wash liquid, expansion packing element 12, which is expanded and realized, to be set, to realize the dual seat of packerEnvelope, further enhances the isolation of oil jacket annulus, prevents hot wash liquid polluted reservoir.Simultaneously in this process, the heat in ring cavityWashing lotion also acts against on deblocking piston 8 and makes to unseal 8 uplink of piston, when the inner conical surface 30 of deblocking piston 8 and the male cone (strobilus masculinus) of lock ring 6After 31 cooperations, under the action of unsealing piston 8, the gap 29 on lock ring 6 is compressed, and the outer diameter of lock ring 6 becomes smaller, lock tube 5 and lockLock tooth between ring 6 releases stuck, lock tube 5 and the realization unlock of lock ring 6.Meanwhile hot wash liquid also passes through the gap 29 on lock ring 6 and arrivesApply upward active force up to the top in ring cavity, and to piston 2 is above set, after lock tube 5 and the unlock of lock ring 6, in 4 He of springUnder the double action of hot wash hydraulic coupling, above set piston 2 and drive 5 uplink of lock tube, it is final on set piston 2, lock tube 5 and spring4 are restored to original position, and packing element 11 is compressed after laying down for lower step well-flushing pressure and the expansion deblocking of packing element 12 is ready.
After compression packing element 11 and expansion packing element 12 realize double-sealing, the well washing switch 20 on packer top is opened, thisWhen hot wash liquid by well washing switch 20 enter oil pipe 19 wax deposition section 26 in, to carry out the operation of hot-washing wax remover.Due to hot washLiquid is directly entered wax deposition section, and when compared to packer being connected in oil pipe bottom, hot wash liquid does not have to get to by long pipelineWax deposition section, therefore heat loss is seldom, thermal energy is fully utilized, and improves the effect of hot-washing wax remover, and hot wash liquid measure used is few, hotIt is high-efficient to wash down wax.Packer is set by building the pressure to realize in advance in oil pipe simultaneously, when hot wash liquid injects oil jacket annulus, noIt has any hot wash liquid to enter in oil reservoir, realizes no pollution, protect oil reservoir.
After the completion of hot-washing wax remover, stop injection hot wash liquid, at this moment acts on adjusting set 10 and set 13 top of piston underPressure disappear, and act on down set 13 lower part of piston oily overpressure be greater than oil jacket annulus in pressure, under set workPlug 13 will push 10 uplink of adjusting set, so that discharging compression packing element 11 and expansion packing element 12 realizes automatic deblocking, oil jacket annulus is againBefore being restored to well-flushing with oil reservoir connected state.In this process, quick for the ease of compression packing element 11 and expansion packing element 12Rebound, the lower part that piston 13 is set under are additionally provided with another through hole being connected to hot wash sap cavity, and in packerLower part is provided with the through-hole being connected to the through hole, and when packer, which is in, sets state, 13 downlink of piston is set due under, leads toVia hole and through-hole are staggered, when hot wash liquid, which stops injection packer, to be unsealed, under set 13 uplink of piston, through hole and logicalHole just centering, therefore packer can also be discharged from through hole and through-hole in a part of hot wash liquid in hot wash sap cavity, to makeTwo-way pressure quickly restores balance in packer, to realize that compression packing element 11 and expansion packing element 12 are quickly sprung back.
During entirely injection hot wash liquid carries out hot-washing wax remover, expansion packing element 12 is either further set, stillCompression packing element 11 and expansion packing element 12 unseal simultaneously, and oil well pump 23 remains normal production, without appointing to pumping pipe stringWhat additional operation, therefore oil pumping operation will not be impacted, it ensure that the normal of oil well while completing hot-washing wax removerProduction.
In the other embodiments of pumping pipe string: spring can be not provided in ring cavity, when above setting piston and being in balance position,Oil liquid to above set the downward active force of piston be equal to the upward active force of piston is set under；Under set the outside of piston can be withIt is not provided with expansion packing element, packer relies only on compression packing element realization and sets, at this time without hot wash sap cavity is arranged again, only oneRing cavity；Unlocking structure can not include deblocking piston, and unlocking structure, which can be, is arranged in cutting between lock ring and central tubeDisconnected pin, when lock tube and locked lock ring, the screen resilience for compressing packing element, which is insufficient to allow, cuts pin cutting, so as to so that compressionPacking element holding sets state, and after hot high pressure washing lotion enters in ring cavity, the hot wash liquid active force upward to lock ring makes break pinNail is cut, and lock tube and lock ring unlock；It keeps structure to can not be lock tooth and interlocks stuck lock tube and lock ring, keep structure can alsoTo be the ball-and-seat being arranged at the inlet opening of top, oil liquid can only enter in plunger shaft one inside central tube and can not be discharged,At this moment a common connector sleeve is connected in the upper lower part for setting piston, when above setting piston downlink, by under connector sleeveIt exercises compression packing element to set, since oil liquid can not be discharged in plunger shaft one, compression packing element may remain in the state of setting, i.e.,On set piston be in set position；Set structure can not include lower part inlet opening and under set piston, at this moment can be upperSet between piston and central tube setting and cut pin, when oil well pump during normal production, it is insufficient into the oil liquid in plunger shaft oneSo that cut pin cut, above set piston be in balance position will not downlink, when building the pressure in oil pipe, cutting pin cut,Balance is broken, and is above set piston downlink and is set to compression packing element pressure with realizing, at this time on set piston and be in and set position.