A kind of method of cable built in coiled tubingTechnical field
The present invention relates to technical field of mechanical oil extraction, the method for cable built in more particularly to a kind of coiled tubing.
Background technology
In oilfield production, operation can be lifted by electric submersible pump and the liquid in oil well is given rise into ground.Wherein, in oil wellIn need to carry out the operations such as drifting scraping, well-flushing to oil well before lower electric submersible pump, meet the job requirements of oil well.And in oil wellElectric submersible pump, which needs motor to provide electric energy for it, could carry out lifting operation, and electric energy is then needed by cable transmission, it is therefore desirable toOne section of cable is connected between the motor of ground control cabinet and electric submersible pump lower end, and needs to fix on cable, otherwise can not be realizedConstruction operation.
The detailed process of the drifting scraping of prior art, well-flushing and lower electric submersible pump operation is：First by first oil pipeLower end is connected with drifting scraping well-washing device, then connects second oil pipe in the upper end of first oil pipe by screw thread, in repetitionOperation is stated, until drifting scraping well-washing device reaches the specified location in well, then carries out drifting scraping and clean-out service；SoMotor, electric submersible pump, solid paraffin control device are sequentially connected with the ground afterwards, and solid paraffin control device is connected with first oil pipe, andAnd by one end of cable and motor connection, motor and its equipment of connection and first oil pipe are placed in well using crane, andMake motor in bottom, stretch cable, and cable is fixed on first oil pipe using strain relief clamp, then passing through screw thread willThe upper end of first oil pipe is connected with the lower end of second oil pipe, and the cable stretched is fixed on into connection oil by strain relief clampOn pipe joint or second oil pipe, aforesaid operations are repeated, until motor reaches the precalculated position in oil well well；Finally set wellMouthful, and the power supply in the other end and ground control cabinet of cable is connected.
Inventor has found that prior art at least has problems with：
Prior art provide by using strain relief clamp by cable be fixed on multistage connection oil pipe on method, operationComplex procedures, operating efficiency is low, and cable fault is easily caused in operation process or in motor operation course.
The content of the invention
Technical problem to be solved of the embodiment of the present invention is, there is provided a kind of flow chart is simple, avoid cable byDamage, the method for improving cable built in the coiled tubing of the operating efficiency of equipment in inspection-pit.Concrete technical scheme is as follows：
The embodiments of the invention provide a kind of method of cable built in coiled tubing, methods described is by following equipment come realIt is existing：Coiled tubing, coiled tubing work vehicle, drifting scraping well-washing device, the special elevator of coiled tubing, cable, motor, electric submersible pump,Solid paraffin control device, cable enter oil connection, tubing nipple, switch board.
Step a, determine target oil well, retired oil pipe after a pressure break is selected as the coiled tubing, then by instituteState drifting scraping well-washing device to be connected with the coiled tubing, and sequentially carry out drifting scraping and clean-out service.
Step b, after the completion for the treatment of the clean-out service, the coiled tubing is consolidated using the coiled tubing special elevatorIt is fixed, and cut off the coiled tubing in predeterminated position, then the cable from the incision tripping in of the coiled tubing toThe inner chamber of the coiled tubing, until the lower end of the coiled tubing is extended to, then by the cut-off part weight of the coiled tubingIt is new to connect to form the coiled tubing of built-in cable, the elevator is unloaded, will be described built-in by the coiled tubing work vehicleThe coiled tubing of cable is all taken out to ground, and unloads the drifting scraping well-washing device.
Step c, the motor, the electric submersible pump, the solid paraffin control device, the cable are entered into oil connection on the groundIt is sequentially connected with, the cable then is entered into oil connection is connected with the coiled tubing of the built-in cable, and makes the cableThe through hole that lower end is entered by the cable on oil connection passes, then with the motor connection.
Step d, the motor connected, the electric submersible pump, the solid paraffin control device, the cable are entered into oil connectionAnd the desired depth described in the coiled tubing tripping in of the built-in cable in target oil well well, and will be described interior using the elevatorThe coiled tubing for putting cable is fixed, and then cuts away the coiled tubing of the unnecessary built-in cable in part, will be remaining described interiorPut the upper end of the coiled tubing of cable and be connected with the tubing nipple that the well head of the target oil well is fixed, unloaded described continuousThe special elevator of oil pipe, well head is finally set, and the other end of the cable is connected with the switch board.
Specifically, preferably, in the step a, realized by the first connected pipes joint under the coiled tubingEnd is connected with the drifting scraping well-washing device：The lower end of the first connected pipes joint is upper with the drifting scraping well-washing deviceEnd threaded connection；Snap ring is provided with the inwall of the upper end of the first connected pipes joint, makes described by the snap ringThe upper end of one connected pipes joint and the lower end clamping of the coiled tubing.
Specifically, preferably, in the step a, after the completion for the treatment of the drifting scraping, by the coiled tubingThe interface of upper end and hot car washing connects, and then carries out the clean-out service.
Specifically, preferably, in the step b, will be cut by coiled tubing connector described in the coiled tubingDisconnected place's reconnect is got up.
Specifically, preferably, the coiled tubing connector is cylinder-like structure, connected along close to the coiled tubingThe outer wall at device both ends is circumferentially provided with multi-turn groove, and the groove is engaged with the inwall of the cut-off part of the coiled tubingConnection.
Specifically, preferably, in the step c, the built-in cable is realized by the first connected pipes jointCoiled tubing enter oil connection with the cable and be connected：Card is provided with the inwall of the upper end of the first connected pipes jointRing, the lower end card of the upper end of the first connected pipes joint and the coiled tubing of the built-in cable is made by the snap ringConnect；The threaded upper ends that the lower end of the first connected pipes joint enters oil connection with the cable are connected.
Specifically, preferably, in the step d, the company of the built-in cable is realized by the second connected pipes jointContinuous oil pipe is connected with the tubing nipple：Snap ring is provided with the inwall of the lower end of the second connected pipes joint, passes through instituteStating snap ring makes the upper end clamping of the lower end of the second connected pipes joint and the coiled tubing of the built-in cable；Described secondThe upper end of connected pipes joint is threadedly coupled with the lower end of the tubing nipple.
Specifically, preferably, in the step d, the target oil well well is pointed to using wellhead cable sealing deviceThe cable at mouthful is sealed and fixed.
The beneficial effect that technical scheme provided in an embodiment of the present invention is brought is：
The method of cable built in coiled tubing provided in an embodiment of the present invention, by by cable be placed in pressure break it is retired after companyThe inner chamber of continuous oil pipe, it is therefore prevented that cable is damaged in oilfield exploitation operation, and cable is built in the inner chamber of coiled tubing, is kept awayExempt to block cable when equipment plays oil pipe in inspection-pit, enormously simplify the operation of equipment in inspection-pit.Meanwhile by by electricityCable is placed in the inner chamber of coiled tubing, and cable is heatable when being powered, it reduce the speed of wax deposition on the inwall of coiled tubing,The frequency of regular maintenance well-flushing can be reduced, reduces production cost.Can sequentially it be completed using method provided in an embodiment of the present inventionDrifting scraping, well-flushing, lower electric submersible pump operation, simplify flow chart, the coiled tubing used for pressure break after retired continuous oilPipe, reasonably make use of waste resource, greatly reduces production cost.It can be seen that method provided in an embodiment of the present invention can avoidCable is damaged, and flow chart is simple, it is possible to increase the operating efficiency of equipment in inspection-pit, is reduced production cost, is easy to popularization to makeWith.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, make required in being described below to embodimentAccompanying drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention, forFor those of ordinary skill in the art, on the premise of not paying creative work, other can also be obtained according to these accompanying drawingsAccompanying drawing.
Device connection diagram when Fig. 1 is drifting scraping and clean-out service provided in an embodiment of the present invention；
Device connection diagram when Fig. 2 is the lower electric submersible pump that further embodiment of this invention provides；
Fig. 3 is location diagram when the special elevator of coiled tubing that further embodiment of this invention provides uses；
Fig. 4 is the profile for the coiled tubing connector that further embodiment of this invention provides.
Wherein, reference represents respectively：
1 coiled tubing,
2 coiled tubing work vehicles,
3 drifting scraping well-washing devices,
The special elevator of 4 coiled tubings,
5 cables,
6 motors,
7 electric submersible pumps,
8 solid paraffin control devices,
9 cables enter oil connection,
10 tubing nipples,
11 switch boards,
The coiled tubing of cable built in 12,
13 first connected pipes joints,
14 hot car washings,
15 coiled tubing connectors,
16 second connected pipes joints,
17 wellhead cable sealing devices.
Embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing to embodiment party of the present inventionFormula is described in further detail.
The embodiments of the invention provide a kind of method of cable built in coiled tubing, this method is by following equipment come realIt is existing：Coiled tubing 1, coiled tubing work vehicle 2, drifting scraping well-washing device 3, the special elevator 4 of the special coiled tubing of coiled tubing, electricityCable 5, motor 6, electric submersible pump 7, solid paraffin control device 8, cable enter oil connection 9, tubing nipple 10, switch board 11, each equipment of the aboveReference can be made to accompanying drawing 1, accompanying drawing 2 and accompanying drawing 3, this method comprise the following steps that：
Step 101, determine target oil well, retired oil pipe after a pressure break is selected as coiled tubing 1, then by driftingScraping well-washing device 3 is connected with coiled tubing 1, and sequentially carries out drifting scraping and clean-out service.
Step 102, after the completion for the treatment of clean-out service, coiled tubing 1 is fixed using coiled tubing special elevator 4, and pre-If position cuts off coiled tubing 1, then cable 5 from the incision tripping in of coiled tubing 1 to the inner chamber of coiled tubing 1, directlyTo the lower end for extending to coiled tubing 1, then the cut-off part of coiled tubing 1 is reconnected to form the continuous oil of built-in cablePipe 12, the special elevator 4 of coiled tubing is unloaded, all taken out the coiled tubing 12 of built-in cable by coiled tubing work vehicle 2To ground, and unload drifting scraping well-washing device 3.
Step 103, motor 6, electric submersible pump 7, solid paraffin control device 8, cable entered into oil connection 9 are on the ground sequentially connected with,Then cable is entered into oil connection 9 to be connected with the coiled tubing 12 of built-in cable, and the lower end of cable 5 is entered oil pipe by cable and connectThrough hole on first 9 passes, and is then connected with motor 6.
Step 104, the motor 6 connected, electric submersible pump 7, solid paraffin control device 8, cable entered into oil connection 9 and built-in cableThe tripping in target oil well well of coiled tubing 12 in desired depth, and using the special elevator 4 of coiled tubing by the company of built-in cableContinuous oil pipe 12 is fixed, and the coiled tubing 12 of the unnecessary built-in cable in part is then cut away, by the continuous oil of remaining built-in cableThe tubing nipple 10 that the upper end of pipe 12 is fixed with the well head of target oil well is connected, and is unloaded the special elevator 4 of coiled tubing, is finally setWell head, and the other end of cable 5 is connected with switch board 11.
The method of cable built in coiled tubing provided in an embodiment of the present invention, by by cable 5 be placed in pressure break it is retired afterThe inner chamber of coiled tubing 1, it is therefore prevented that cable 5 is impaired in oilfield exploitation operation, and cable 5 is built in coiled tubing 1In chamber, avoid and block cable 5 when equipment plays oil pipe in inspection-pit, enormously simplify the operation of equipment in inspection-pit.MeanwhileBy the way that cable 5 is placed in the inner chamber of coiled tubing 1, cable 5 is heatable when being powered, and it reduce the inwall of coiled tubing 1The speed of upper wax deposition, the frequency of well-flushing can be reduced, reduces production cost.Can be sequentially using method provided in an embodiment of the present inventionComplete drifting scraping, well-flushing, the operation of lower electric submersible pump 7, simplify flow chart, the coiled tubing 1 used for pressure break after it is retiredCoiled tubing 1, reasonably make use of waste resource, greatly reduce production cost.It can be seen that method provided in an embodiment of the present inventionCable 5 can be avoided impaired, flow chart is simple, it is possible to increase the operating efficiency of equipment in inspection-pit, to reduce production cost, be easy toPromote the use of.
Specifically, in a step 101, it is first determined target oil well, retired oil pipe is made after a piece well workover of selection or pressure breakFor coiled tubing 1, then drifting scraping well-washing device 3 is connected with the lower end of coiled tubing 1, will using coiled tubing work vehicle 2Then the drifting scraping well-washing device 3 and coiled tubing 1 connected carries out dredging, scraping from the well head tripping in designated depth of target oil wellOperation is cut, after the completion for the treatment of drifting scraping, the upper end of coiled tubing 1 is connected with the interface of hot car washing 14, then washedWell operations.Drifting scraping work is carried out by the segmented plain tubing for replacing using at present from the retired coiled tubing 1 of pressure breakIndustry and clean-out service, greatly reduce production cost, and the retired coiled tubing 1 of pressure break is steel oil pipe, compared to combined typeCoiled tubing thermal conductivity is good, and which improve the effect of clean-out service.
Specifically, the lower end and drifting scraping well-washing device 3 that coiled tubing 1 is realized by the first connected pipes joint 13 connectConnect：The lower end of first connected pipes joint 13 is connected with the threaded upper ends of drifting scraping well-washing device 3；First connected pipes joint 13Upper end inwall on be provided with snap ring, the upper end of the first connected pipes joint 13 and the lower end of coiled tubing 1 are made by snap ringClamping.The connected mode of the first connected pipes joint 13 and coiled tubing 1 and drifting scraping well-washing device 3 is arranged such, is easy to theThe connection and dismounting of one connected pipes joint 13 and drifting scraping well-washing device 3, while the first connected pipes joint 13 is set with connectingThe lower end clamping of continuous oil pipe 1, the lower end of coiled tubing 1 can be made to be connected equipment with other and realize threaded connection.
Specifically, in a step 102, will be continuous using the special elevator 4 of coiled tubing on ground after the completion for the treatment of clean-out serviceOil pipe 1 is fixed on the well head of target oil well, and cuts off coiled tubing 1 in predeterminated position, then cable 5 from coiled tubing 1Incision tripping in the inner chamber of coiled tubing 1, and the lower end of cable 5 is extended to the lower end of coiled tubing 1, and in lower electricityDuring cable 5, the inwall tripping in by cable 5 close to coiled tubing 1, after tripping in cable 5, coiled tubing connection is recycledDevice 15, which reconnects the cut-off part of the coiled tubing 1 of cut-out, to get up to form the coiled tubing 12 of built-in cable, unloads continuous oilSpecial elevator 4 is managed, is wound the coiled tubing 12 of built-in cable on coiled tubing work vehicle 2 by coiled tubing work vehicle 2,When the coiled tubing 12 and drifting scraping well-washing device 3 of built-in cable are fetched into ground out of target oil well well, the company of unloadingThe drifting scraping well-washing device 3 being connected on the first connected pipes joint 13.By the way that coiled tubing 1 is cut off, and by cable 5 from otchLocate tripping in the inner chamber of coiled tubing 1, be easy to make cable 5 form similar sinusoidal multiple spot in the inner chamber of coiled tubing 1Adhered state, and then stress of the cable 5 in the production operation of oil field is efficiently avoid, improve cable 5 uses the longevityLife.
Wherein, coiled tubing connector 15 passes through coiled tubing connector it can be appreciated that be a kind of connector of oil pipes of oilThe cut-off part of coiled tubing 1 is reconnected by 15, and this is while cable 5 to be built in the inner chamber of coiled tubing 1, and justOil pipe after cut-out forms coiled tubing 1 again, is easy to the operation of electric submersible pump 7 under the later stage.Specifically, as shown in Figure 4, continuouslyOil pipe connector 15 is cylinder-like structure, along the outer wall close to the both ends of coiled tubing connector 15 to be circumferentially provided with multi-turn recessedGroove, the inwall of groove and the cut-off part of coiled tubing 1 are connected., will continuous oil when the coiled tubing 1 of cut-out is reconnectedThe both ends of tube connector 15 are inserted in the tube wall of the cut-off part of coiled tubing 1 respectively, then by giving cut-off part tube wall pressure,Make the inner chamber for two sections of coiled tubings 1 that the both ends of coiled tubing connector 15 deeply cut off, until the end face of two sections of coiled tubings 1Abutted with the step of the center section of coiled tubing connector 15, the groove of coiled tubing connector 15 and two sections of coiled tubings1 inwall occlusion is tight, to complete the reconnect of the coiled tubing 1 of cut-out.The connected mode is simple, detachable, and can protectThe inner chamber for demonstrate,proving coiled tubing 1 is continuous.
Specifically, in step 103, motor 6, electric submersible pump 7, solid paraffin control device 8, cable are entered into oil connection on the ground9 are sequentially connected with, and cable is entered into oil connection 9 and is connected with the first connected pipes joint 13, while make the continuous oil of built-in cableThe lower end of cable 5 in the inner chamber of pipe 12 passes cable and enters through hole on oil connection 9, and by the lower end of cable 5 and the phase of motor 6Even.Wherein, it can be that electric submersible pump 7 provides electric energy to set motor 6, set cable to enter oil connection 9 and be easy to cable 5 from built-in cableThe lower end of coiled tubing 12 stretch out, and then be connected with motor 6；Solid paraffin control device 8 is set to prevent the continuous oil of built-in cableWax deposition on the inwall of pipe 12, being advantageous to the production in oil field, reduce clean-out service, solid paraffin control device 8 is common for this area, andAnd market is common, such as the present invention can be realized using the solid paraffin control device of commercially available GTFL-4500 models.SpecificallyGround, motor 6, electric submersible pump 7, solid paraffin control device 8, cable are connected between entering oil connection 9 by joint screw thread, the side of threaded connectionFormula is easy to the dismounting and connection of these equipment, and joint easily obtains.
Specifically, the coiled tubing 12 for realizing built-in cable by the first connected pipes joint 13 enters oil connection with cable9 connections：Snap ring is provided with the inwall of the upper end of first connected pipes joint 13, the first connected pipes joint 13 is made by snap ringUpper end and built-in cable coiled tubing 12 lower end clamping；The lower end of first connected pipes joint 13 enters oil pipe with cable and connectFirst 9 threaded upper ends connection.Upper end and the lower end card of the coiled tubing 12 of built-in cable by the first connected pipes joint 13Connect, be easy to implement lower end and the quick connection of the first connected pipes joint 13 of the coiled tubing 12 of crude built-in cableWith dismounting；The threaded upper ends for entering oil connection 9 with cable by the lower end of the first connected pipes joint 13 of setting are connected, and are easy to realityBoth existing connections, and threaded connection power is strong, avoids cable and enters coming off for oil connection 9.
Specifically, at step 104, the motor 6 connected, electric submersible pump 7, solid paraffin control device 8, cable are entered into oil connection9 and built-in cable the tripping in target oil well well of coiled tubing 12 in desired depth, and using the special elevator 4 of coiled tubing will inThe coiled tubing 12 for putting cable is fixed, and first determines to need the length of the coiled tubing 12 of the built-in cable in tripping in target oil well wellDegree, then cuts away the coiled tubing 12 of the unnecessary built-in cable in part, unloads the special elevator 4 of coiled tubing afterwards, will be remainingThe tubing nipple 10 that the upper end of the coiled tubing 12 of built-in cable is fixed with the well head of target oil well is connected, and finally sets well head,And the power supply inside the switch board 11 on the other end and ground of cable 5 is connected.The built-in cable unnecessary by cutting away partCoiled tubing 12, and will the coiled tubing 12 of remaining built-in cable is fixed with well head in target oil well well tubing nipple 10Connection, the length for being adapted to the coiled tubing 12 of built-in cable required in whole target oil well well can be completed.
Specifically, the coiled tubing 12 for realizing built-in cable by the second connected pipes joint 16 connects with tubing nipple 10Connect：Snap ring is provided with the inwall of the lower end of second connected pipes joint 16, the second connected pipes joint 16 is made by snap ringLower end and the upper end clamping of the coiled tubing 12 of built-in cable；Under the upper end of second connected pipes joint 16 and tubing nipple 10End threaded connection.The mode being connected through a screw thread can make between upper end and the tubing nipple 10 of the second connected pipes joint 16Attachment force is strong, and the coiled tubing 12 for avoiding built-in cable is fallen off, and is easy to the second connected pipes to connect by way of clampingFirst 16 lower end and the quick connection and dismounting of the coiled tubing 12 of built-in cable.
Wherein, the cable 5 at target well mouth of oil well is pointed to using wellhead cable sealing device 17 to be sealed and fixed,This prevent oil leakage phenomenon occurs in oilfield production, while cable 5 is fixed on to the well head of target oil well, prevent cable 5 withMovement on a large scale occurs for the flowing for the profit in built-in coiled tubing 1.
Presently preferred embodiments of the present invention is these are only, the protection domain being not intended to limit the invention is all the present invention'sWithin spirit and principle, any modification, equivalent substitution and improvements made etc., it should be included in the scope of the protection.