CN102979496A - Coiled tubing multilayer fracture acidizing pipe string and application method thereof - Google Patents
Coiled tubing multilayer fracture acidizing pipe string and application method thereof Download PDFInfo
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- CN102979496A CN102979496A CN2012104582801A CN201210458280A CN102979496A CN 102979496 A CN102979496 A CN 102979496A CN 2012104582801 A CN2012104582801 A CN 2012104582801A CN 201210458280 A CN201210458280 A CN 201210458280A CN 102979496 A CN102979496 A CN 102979496A
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Abstract
The invention discloses a coiled tubing multilayer fracture acidizing pipe string and a application method of the coiled tubing multilayer fracture acidizing pipe string. The coiled tubing multilayer fracture acidizing pipe string comprises a bridge plug, a collar locator, a release sub and a packer. The bridge plug is set in the lower oil layer of an oil well. The bridge plug is positioned on the preset position of the collar locator through the collar locator. The release sub is connected with the upper portion of the bridge plug in a detachable mode. The packer comprises a central tube. A top connection is arranged at the upper end of the central tube. A packer rubber sleeve is arranged on the lower portion of the central tube in a sleeved mode. A slip component is arranged between the packer rubber sleeve and the top connection. The outer wall of the central tube is opened with a spout group in an axial mode, wherein the spout group is fitted with the slip component in a sliding mode. The lifting and down-pass of the central tube is driven by external force, and therefore the track pin of the slip component can slide sequentially along the spout group to limit the lifting and down-pass travel of the central tube and to drive sequentially the collar locator position, the bridge plug setting, the separation of the release sub and the bridge plug and the packer setting. The coiled tubing multilayer fracture acidizing pipe string and the application method of the coiled tubing multilayer fracture acidizing pipe string can achieve the thin interbed oil well layered fracturing and is simple in process, precise in position, and can improve the fracturing construction efficiency, shorten well completion period and save the formation testing and cost.
Description
Technical field
The present invention relates to use process pipe string and the method that coiled tubing is implemented stimulation work in a kind of oil development, relate in particular to a kind of continuous oil pipe multi-layer fracturing acidification technique tubing string and method.
Background technology
At present, in the oil development field, for the demand of low-cost multiple fracturing acid stimulation operation, adopt coiled tubing to carry out stimulation work, have potentiality and advantage.Domestic coiled tubing kit imperfection, multiple fracturing process matching tubing string is in blank, these factor restriction coiled tubing application in the Oil Field stimulation work.
The people such as Yin Congbin write articles " straight well multi-section multi-layer coiled tubing successively back-up sand fracturing technology is explored " (" natural gas technology ", volume Two in 2008, the 6th phase) introduced a kind of successively back-up sand technique, this technology utilization coiled tubing carries the packer that can repeatedly enable (fluid pressure type or expansion type), carries on successively and sets, implements successively pressure break in the cyclic process of deblocking, back-up sand.Its typical process flow is: step 1: coiled tubing band packer is lowered to the bottom of interval to be pressed, utilizing the artificial bottom of a well to survey with coiled tubing accurately locates from tape counter, it is the fracturing fluid base fluid that the interior well killing fluid of oil pipe is replaced in direct circulation, unpacking packer (all upper strata perforated intervals of packing), coiled tubing pressure break first floor; Step 2: removing seal for packer, on carry coiled tubing to the second and wait to press layer (accurately location), open sleeve gate, direct circulation load fluid (containing the back-up sand amount of calculating), base fluid compacting back-up sand section capable of circulation after the sand sedimentation; Step 3: close sleeve gate, direct circulation unpacking packer, the coiled tubing pressure break second layer; Circulation second and third step are until the complete institute of pressure break remains to be pressed interval.
But existing continuous oil pipe multi-layer fracturing acidification technique tubing string and fracturing process still have the some shortcomings part:
1, the accurate orientation problem of unresolved downhole tool;
2, accurate for back-up sand sand amount calculation requirement, and this construction technology operation is loaded down with trivial details;
3, completion period long, the distinctive quick completion advantage of coiled tubing does not obtain embodying.
Summary of the invention
The purpose of this invention is to provide and a kind ofly can realize successively pressure break of thin interbed oil well, operation is simple, the continuous oil pipe multi-layer fracturing acidification technique tubing string of accurate positioning, shortening completion period.
Another object of the present invention provides and a kind ofly can realize successively pressure break of thin interbed oil well, and operation is simple, the using method of the continuous oil pipe multi-layer fracturing of accurate positioning, shortening completion period.
For achieving the above object, the present invention proposes a kind of continuous oil pipe multi-layer fracturing acidification technique tubing string, is used for the oil well multiple fracturing, and described tubing string comprises: bridging plug, have bridging plug slips and the bridging plug packing element that can radially stretch, so that described bridging plug sets in the bottom of oil well oil reservoir; Collar locator, be connected in the bottom of described bridging plug, this collar locator has support claw radially flexible under the elastic force effect, described support claw can fasten in the draw-in groove of down-hole casing and the formation of casing coupling junction, so that described bridging plug is positioned the precalculated position, down-hole by described collar locator; Give up, this give up with the top of described bridging plug can dismounting be connected, when described bridging plug set finish after, described giving up is separated with described bridging plug; Packer, comprise central tube, upper end at described central tube is provided with top connection, be used for connecting coiled tubing, lower end at described central tube is provided with lower contact, be used for connecting described upper end of giving up, bottom at described central tube is arranged with packing element, between described packing element and described top connection, be provided with slip assemblies, described slip assemblies inboard is provided with track pin, this track pin is slidingly matched with the chute group that is opened on the described central tube outer wall vertically, slides along described chute group track thereby drive described slip assemblies; Driving described central tube by external force raises and decentralizes, so that the track pin of described slip assemblies is successively along the displacement that reciprocatingly slides of many parallel slideways in the described chute group, the stroke that raises and decentralizes to limit described central tube, and then drive successively that described collar locator location, described bridging plug set, described giving up separated with described bridging plug, and described packer setting.
Aforesaid continuous oil pipe multi-layer fracturing acidification technique tubing string, wherein, described chute group comprises axially offers many parallel described slideways along described central tube, described slideway comprises long slideway and short slideway, be provided with two described short slideways between adjacent two described long slideways, the upper end of each described slideway is concordant and be connected.
Aforesaid continuous oil pipe multi-layer fracturing acidification technique tubing string, wherein, described bridging plug comprises: bridging plug central tube, the described bridging plug slips that is consisted of by upper slips and lower slips, and be arranged at bridging plug packing element between described upper slips and the described lower slips; Described upper slips joins by a cone and described lower end of giving up, and described giving up radially expanded by the described upper slips of driving of exerting pressure to described cone, so that described bridging plug location; Described lower slips is slidable to be set on the described bridging plug central tube, the inboard of described lower slips is provided with the slide rail pin, on described bridging plug central tube, offer the sliding-rail groove group corresponding to described slide rail pin, described sliding-rail groove group comprises axially offers many parallel described sliding-rail grooves along described bridging plug central tube, described sliding-rail groove comprises long rail groove and short rail groove, between adjacent two described long rail grooves, be provided with a described short rail groove, the lower end of adjacent two described sliding-rail groove is concordant and be connected, described slide rail pin slides along described sliding-rail groove group, when described slide rail pin slides into the upper end of described long rail groove, described lower slips is exerted pressure to described bridging plug packing element, drive described bridging plug packing element and radially expand, so that described bridging plug sets.
Aforesaid continuous oil pipe multi-layer fracturing acidification technique tubing string, wherein, described collar locator comprises: the box cupling central tube; Box cupling top connection and box cupling lower contact are arranged at respectively the two ends of described box cupling central tube; On described box cupling central tube, be arranged with successively described support claw from top to bottom, and spring and positioning sleeve.
Aforesaid continuous oil pipe multi-layer fracturing acidification technique tubing string, wherein, described giving up comprises: the top connection of giving up, inside wall bottom in the described top connection of giving up is plugged with connecting rod, lateral wall bottom in the described top connection of giving up is plugged with sheath, between described connecting rod and described sheath, be provided with spring, the sidewall phase contact of one end of described spring and the described top connection of giving up, its other end and the lower contact phase contact of giving up, in described connecting rod and the described upper slips of the slidable insertion of the described lower contact of giving up, the lower end of described connecting rod can the described cone of butt.
Aforesaid continuous oil pipe multi-layer fracturing acidification technique tubing string, wherein, described slip assemblies comprises: the slips body, towards described packing element setting; Track pin, it is inboard to be located at described slips body; Wiper block is fixedly arranged on the described slips body outer wall.
Aforesaid continuous oil pipe multi-layer fracturing acidification technique tubing string, wherein, described packer is the tension type packer.
Aforesaid continuous oil pipe multi-layer fracturing acidification technique tubing string, wherein, described bridging plug is that leather cup type can drag for bridging plug.
The present invention also provides a kind of using method of aforesaid continuous oil pipe multi-layer fracturing acidification technique tubing string, and wherein, the method may further comprise the steps:
For the first time transfer tubing string to the precalculated position below the bottom fractured layer of multiple fracturing oil well;
Upper lifting pipe post for the first time, the collar locator support claw by radially expansion fastens in the draw-in groove of down-hole casing and the formation of casing coupling junction, so that described bridging plug is positioned the precalculated position, down-hole by described collar locator;
For the second time transfer tubing string, the upper slips of bridging plug and lower slips pushing tow bridging plug packing element so that the expanded radially of bridging plug packing element so that bridging plug sets in the precalculated position, down-hole, applies hydraulic coupling simultaneously to giving up, are tending towards breaking away from bridging plug so that give up gradually;
Upper lifting pipe post for the second time, giving up is separated with bridging plug, so that give up and packer places the following position of the above and adjacent last layer fractured layer of bottom fractured layer;
Transfer for the third time tubing string;
Upper lifting pipe post for the third time, so that the slip assemblies pushing tow packing element of packer, so that the packing element expanded radially, so that packer setting is in more than the bottom fractured layer and the position below the adjacent last layer fractured layer;
The stroke that raises and decentralizes of the length control tubing string of the parallel slideway by the chute group drives the collar locator location, bridging plug sets, gives up and separate with described bridging plug successively, and packer setting, and then packing bottom fractured layer;
After the fracture acidizing operation was finished, deblocking packer was transferred tubing string so that give up and is connected the deblocking bridging plug with bridging plug; The upper lifting pipe post is finished the operation of bottom fractured layer to well head again, repeats above-mentioned steps, the last layer fractured layer is carried out operation, until the superiors' fractured layer is finished whole operations.
The using method of aforesaid continuous oil pipe multi-layer fracturing acidification technique tubing string, wherein, described chute group comprises axially offers many parallel described slideways along described central tube, described slideway comprises long slideway and short slideway, be provided with two described short slideways between adjacent two described long slideways, the upper end of adjacent two described slideway is concordant and be connected; Described bridging plug comprises: the described bridging plug slips that is consisted of by upper slips and lower slips, and be arranged at bridging plug packing element between described upper slips and the described lower slips; Described upper slips joins by a cone and described lower end of giving up, and described giving up radially expanded by the described upper slips of driving of exerting pressure to described cone, so that described bridging plug location; Described bridging plug slip sleeve is fixed on the bridging plug central tube that is connected to described upper slips lower end, described lower slips is slidable to be set on the described bridging plug central tube, the inboard of described lower slips is provided with the slide rail pin, on described bridging plug central tube, offer the sliding-rail groove group corresponding to described slide rail pin, described sliding-rail groove group comprises axially offers many parallel described sliding-rail grooves along described bridging plug central tube, described sliding-rail groove comprises long rail groove and short rail groove, between adjacent two described long rail grooves, be provided with a described short rail groove, the lower end of adjacent two described sliding-rail groove is concordant and be connected
When transferring tubing string for the first time, track pin is positioned at the initial position of chute group upper end; Simultaneously, the slide rail pin is positioned at the upper end of a short rail groove of sliding-rail groove group;
For the first time during the upper lifting pipe post, track pin slides into the bottom of the described short slideway of article one; Simultaneously, the slide rail pin slides into the bottom of this weak point rail groove;
When transferring tubing string for the second time, track pin slides into the upper end of the described short slideway of second; Simultaneously, the slide rail pin slides into the upper end of adjacent long rail groove;
For the second time during the upper lifting pipe post, track pin slides into the bottom of the described short slideway of second;
When transferring tubing string for the third time, track pin slides into the upper end of described long slideway;
During the upper lifting pipe post, track pin slides into the bottom of adjacent described long slideway for the third time.
Compared with prior art, the present invention has following characteristics and advantage:
1, the present invention is directed to thin interbed formation fracturing acidizing treatment and develop, this process pipe string by the tension type packer, give up and the instruments such as bridging plug, collar locator form a cover complete enter well tool, the well that enters that at first adopts collar locator to carry out downhole tool is accurately located, then set bridging plug, packer, the fracture acidizing construction is carried out in packing construction layer position; After this layer construction finished, using gives up picked up bridging plug, repeated above-mentioned operation and carried out upper strata fracture acidizing construction.The present invention can realize successively pressure break of thin interbed oil well, has that operation is simple, the advantage of accurate positioning, shortening completion period.
2, the using method of continuous oil pipe multi-layer fracturing of the present invention is different from conventional oil pipe fracturing work, can implement successively pressure break under not kill-job condition, implements the successively pressure break more than four layers; Repeatedly the tension type packer of Reusability, leather cup type bridging plug are saved the activity duration, are improved the fracture acidizing efficiency of construction, shorten completion period; Formation testing cycle and cost have greatly been saved.
Description of drawings
Accompanying drawing described here only is used for task of explanation, and is not intended to limit by any way scope disclosed by the invention.In addition, the shape of each parts among the figure and proportional sizes etc. only are schematically, be used for helping the understanding of the present invention, and be not shape and the proportional sizes that specifically limits each parts of the present invention.Those skilled in the art can select various possible shapes and proportional sizes to implement the present invention under instruction of the present invention as the case may be.
Fig. 1 is the decomposition texture schematic diagram of the each several part of continuous oil pipe multi-layer fracturing acidification technique tubing string of the present invention when transferring for the first time;
Fig. 2 is the decomposition texture schematic diagram of continuous oil pipe multi-layer fracturing acidification technique tubing string of the present invention each several part when carrying for the first time;
Fig. 3 is the packer construction schematic diagram of continuous oil pipe multi-layer fracturing acidification technique tubing string of the present invention when transferring for the second time;
Fig. 4 is packer when carrying for the second time of continuous oil pipe multi-layer fracturing acidification technique tubing string of the present invention, give up and the decomposition texture schematic diagram of bridging plug;
Fig. 5 is the packer construction schematic diagram of continuous oil pipe multi-layer fracturing acidification technique tubing string of the present invention when transferring for the third time;
Fig. 6 is the packer construction schematic diagram of continuous oil pipe multi-layer fracturing acidification technique tubing string of the present invention when carrying for the third time.
Fig. 7 is the structural representation of the chute group of packer of the present invention;
Fig. 8 is the structural representation of the sliding-rail groove group of bridging plug of the present invention;
Fig. 9 is the in use structural representation of G.I.H of continuous oil pipe multi-layer fracturing acidification technique tubing string of the present invention;
Figure 10 is in use bridging plug and the structural representation of giving up after separating of continuous oil pipe multi-layer fracturing acidification technique tubing string of the present invention;
Figure 11 is continuous oil pipe multi-layer fracturing acidification technique tubing string of the present invention carries out operation in use to the last layer fractured layer structural representation.
Description of reference numerals:
The 1-packer; The 10-track pin; The 11-wiper block; 12-slips body; The 13-central tube; The 14-cone; The 15-packing element; The 16-positioning sleeve; The 17-lower contact; The 18-top connection;
2-gives up; The 20-top connection of giving up; The 21-sheath; The 22-spring; The 23-connecting rod; The 24-lower contact of giving up; The 25-sheath; 26-slips housing; The 27-cone; 28-overcurrent ring; The 29-spheroid;
The 3-bridging plug; The 30-upper slips; The 31-connector; The 32-adapter sleeve; 33-bridging plug packing element; The 34-cone; The 35-lower slips; The 36-wiper block; 37-slide rail pin; 38-bridging plug central tube;
The 4-collar locator; The top connection of 41-box cupling; The 42-body; The 43-support claw; The 44-spring leaf; The 45-staple; 46-box cupling central tube; The 47-spring; The 48-positioning sleeve; The lower contact of 49-box cupling;
5-chute group; The long slideway of 51-; The short slideway of 52-; The short slideway of 521-article one; The short slideway of 522-second;
6-sliding-rail groove group; The long rail groove of 61-; The short rail groove of 62-.
The specific embodiment
With the description of the specific embodiment of the invention, can more be well understood to details of the present invention by reference to the accompanying drawings.But the specific embodiment of the present invention described here only is used for explaining purpose of the present invention, is limitation of the present invention and can not be understood as by any way.Under instruction of the present invention, the technician can conceive based on arbitrarily possible distortion of the present invention, and these all should be regarded as belonging to scope of the present invention.
Please refer to Fig. 1 to Fig. 6, be respectively the decomposition texture schematic diagram of continuous oil pipe multi-layer fracturing acidification technique tubing string of the present invention and repeatedly below and the decomposition texture schematic diagram when promoting.As shown in the figure, the continuous oil pipe multi-layer fracturing acidification technique tubing string that the present invention proposes is used for the oil well multi-layer fracturing operation, and this tubing string comprises: the packer 1 that from top to bottom is linked in sequence, give up 2, bridging plug 3 and collar locator 4.Bridging plug 3 has bridging plug slips (upper slips 30 and lower slips 35) and the bridging plug packing element 33 that can radially stretch, upper slips 30 and lower slips 35 are radially expanded stopper on sleeve under the driving of external force, so that bridging plug 3 location, and clamp bridging plug packing element 33 by upper slips 30 and lower slips 35, so that bridging plug 3 sets in the bottom of oil well oil reservoir, i.e. following position, operation oil reservoir lower surface.Collar locator 4 is connected in the bottom of bridging plug 3, this collar locator 4 has support claw 43 radially flexible under the elastic force effect, support claw 43 can fasten in the draw-in groove of down-hole casing and the formation of casing coupling junction, thereby with collar locator 4 location, and then so that bridging plug 3 is positioned the precalculated position, down-hole by collar locator 4, this precalculated position is collar locator 4 and sets setting position below operation oil reservoir lower surface.Give up 2 with the top of bridging plug 3 can dismounting be connected, when bridging plug 3 set finish after, giving up 2 is separated with bridging plug 3, so that the packer 1 on tubing string top and giving up 2 is separated with bridging plug 3 and the collar locator 4 of tubing string bottom, so that carry on the packer 1 to its predetermined setting position; After a fractured layer operation is finished, give up and 2 transfer and can again join with bridging plug 3, bridging plug 3 and collar locator 4 are salvaged.Packer 1 comprises central tube 13, be provided with top connection 18 in the upper end of central tube 13, be used for connecting coiled tubing, be provided with lower contact 17 in the lower end of central tube 13, be used for to connect 2 the upper end of giving up, be arranged with packing element 15 in the bottom of central tube 13, between packing element 15 and top connection 18, be provided with slip assemblies, slip assemblies comprises: slips body 12 arranges towards packing element 15; Track pin 10 is located at slips body 12 inboards; Wiper block 11 is fixedly arranged on slips body 12 outer walls.The track pin 10 of slip assemblies is slidingly matched with the chute group 5 (as shown in Figure 8) that is opened on central tube 13 outer walls vertically, slides along chute group 5 tracks thereby drive slip assemblies.Driving central tube 13 by external force raises and decentralizes, so that the track pin 10 of slip assemblies is successively along the displacement that reciprocatingly slides of many parallel slideways in the chute group 5, the stroke that raises and decentralizes to limit central tube 10, and then drive successively collar locator 4 location, bridging plug 3 and set, give up and 2 separate with bridging plug 3, and packer 1 sets, realization is to the packing of assignment oil reservoir, realizes thin interbed oil well pressure break successively, has that operation is simple, the beneficial effect of accurate positioning, shortening completion period.
As shown in Figure 7, be the structural representation of the chute group of packer of the present invention.In the present invention, chute group 5 comprises axially offers many parallel slideways along central tube 13, slideway comprises long slideway 51 and short slideway 52, be provided with two short slideways 52 between adjacent two long slideways 51, the upper end of each slideway (comprise long slideway 51 and short slideway 52) is concordant and be connected.Like this, process pipe string carry and below process in, lacking slideway 52 and long slideway 51 interior slips successively by track pin 10, the stroke that restriction central tube 10 raises and decentralizes, and then drive collar locator 4, bridging plug 3, give up 2, the corresponding component action in the packer 1, realize thin interbed oil well pressure break successively.
As shown in Figure 1, bridging plug 3 comprises: bridging plug central tube 38, the bridging plug slips that is consisted of by upper slips 30 and lower slips 35, and be arranged at bridging plug packing element 33 between upper slips 30 and the lower slips 35.Upper slips 30 joins by a cone 27 and 2 the lower end of giving up, and in use, transfers tubing string, track pin 10 is descending along short slideways 52,2 applies hydraulic coupling to giving up, and drives upper slipses 30 by cone 27 and radially expands, upper slips 30 is fastened on the sleeve of down-hole, realize bridging plug 3 location; Lower slips 35 slidable being set on the bridging plug central tube 38; the inboard of lower slips 35 is provided with slide rail pin 37; on bridging plug central tube 38, offer sliding-rail groove group 6 corresponding to slide rail pin 37; as shown in Figure 8; sliding-rail groove group 6 comprises axially offers many parallel sliding-rail grooves along bridging plug central tube 38; sliding-rail groove comprises long rail groove 61 and short rail groove 62; between adjacent two long rail grooves 61, be provided with a short rail groove 62; the lower end of adjacent two sliding-rail groove is concordant and be connected; slide rail pin 37 slides along sliding-rail groove group track; when slide rail pin 37 slides into the upper end of long rail groove 61; lower slips 35 is exerted pressure to bridging plug packing element 33; drive radially expansion of bridging plug packing element 33, so that bridging plug 3 sets.Bridging plug 3 adopts leather cup sealing member, and fluid power sets, and avoids ballast to set, packing bottom oil reservoir.
As shown in Figure 1, collar locator 4 comprises: box cupling central tube 46; Box cupling top connection 41 and box cupling lower contact 49 are arranged at respectively the two ends of box cupling central tube 46; On box cupling central tube 46, be arranged with successively support claw 43 from top to bottom, and spring 47 and positioning sleeve 48.The support claw 43 of collar locator 4 fastens in the draw-in groove of down-hole casing and the formation of casing coupling junction, thereby with collar locator 4 location, collar locator 4 concrete structures and operating principle are prior art, are not described in detail at this.Collar locator 4 cooperates tubing string of the present invention to be lowered to predetermined the transformation below the oil reservoir by coiled tubing, the upper lifting pipe post, the support claw 43 of bottom collar locator 4 enters in the casing coupling space, make oil pipe produce about 3 tons additional tension, by contrasting with log data, take this box cupling degree of depth as benchmark, accurately locate the well depth that enters of downhole tool; Whether simultaneously this instrument indication is given up and is thrown off with tubing string.
Shown in Fig. 1,2,4, of the present invention giving up 2 comprises: the top connection 20 of giving up, inside wall bottom in the top connection 20 of giving up is plugged with connecting rod 23, lateral wall bottom in the top connection 20 of giving up is plugged with sheath 21, between connecting rod 23 and sheath 25, be provided with spring 22, the sidewall phase contact of an end of spring 22 and the top connection 20 of giving up, its other end and the lower contact 24 phase contacts of giving up, in connecting rod 23 and the lower contact 24 slidable insertion upper slipses 30 of giving up, the lower end of connecting rod 23 can butt cone 27.Give up and 2 adopt the hydraulic releasing modes, can insert bridging plug 3 after putting aside and achieve a butt joint, bridging plug 3 is pulled out in well.
Please in the lump with reference to figure 9 to Figure 11, the present invention also provides the using method of above-mentioned continuous oil pipe multi-layer fracturing acidification technique tubing string, this process pipe string by tension type packer 1, give up 2, bridging plug 3, collar locator 4 etc. form.Tubing string is with coiled tubing G.I.H precalculated position below, on carry coiled tubing, collar locator 4 blocks casing coupling, weight indicator produces 2-3 ton suspending weight to be increased, thereby the well that enters that carries out downhole tool is accurately located; Then set bridging plug 3, destroy and give up 2; On carry packer 1 to the precalculated position, set packer 1, fracture acidizing construction is carried out in packing construction layer position; After the construction of this layer finished, using gives up 2 picked up bridging plug 3, repeats above-mentioned operation and carries out upper strata fracture acidizing construction.The concrete steps of the method are as follows:
Step 10: as shown in Figure 1, transfer tubing string to the precalculated position below the bottom fractured layer of multiple fracturing oil well for the first time; At this moment, the track pin 10 of packer 1 is arranged in the initial position (being Fig. 7 A place) of chute group 5 upper ends; Simultaneously, the slide rail pin 37 of bridging plug 3 is arranged in the upper end (being Fig. 8 a place) of a short rail groove of sliding-rail groove group 6;
Step 20: as shown in Figure 2, upper lifting pipe post for the first time, collar locator 4 support claw 43 by radially expansion fastens in the draw-in groove of down-hole casing and the formation of casing coupling junction, so that bridging plug 3 is positioned the precalculated position, down-hole by collar locator 4; At this moment, track pin 10 slides into the bottom (being B place among Fig. 7) of the short slideway 521 of article one along the short slideway 521 of article one; Simultaneously, slide rail pin 37 slides into the bottom (being b place among Fig. 8) of this weak point rail groove 62 along above-mentioned short rail groove 62;
Step 30: as shown in Figure 3, transfer tubing string, the upper slips 30 of bridging plug 3 and lower slips 35 pushing tow bridging plug packing elements 33 for the second time, so that bridging plug packing element 33 expanded radiallys, so that bridging plug 3 sets in the precalculated position, down-hole, 2 apply hydraulic coupling to giving up simultaneously, 2 be tending towards breaking away from bridging plug 3 gradually so that give up; At this moment, track pin 10 slides into the upper end (being C place among Fig. 7) of the short slideway 522 of second along the short slideway 521 of article one; Simultaneously, slide rail pin 37 slides into the upper end (being c place among Fig. 8) of this long rail groove 61 along adjacent long rail groove 61;
Step 40: upper lifting pipe post for the second time, giving up 2 is separated with bridging plug 3 so that give up 2 and packer 1 place the following position of the above and adjacent last layer fractured layer of bottom fractured layer; Track pin 10 slides into the bottom (being D place among Fig. 7) of the short slideway 522 of second along the short slideway 522 of second;
Step 50: transfer for the third time tubing string; At this moment, track pin 10 slides into the upper end (being E place among Fig. 7) of long slideway 51 along the short slideway 522 of second;
Step 60: upper lifting pipe post for the third time, so that the slip assemblies pushing tow packing element 15 of packer 1, so that packing element 15 expanded radiallys, so that packer 1 sets in more than the bottom fractured layer and the position below the adjacent last layer fractured layer; Track pin 10 slides into the bottom (being F place among Fig. 7) of adjacent long slideway 51.
The stroke that raises and decentralizes of the length control tubing string of the parallel slideway by the chute group drives successively collar locator 4 location, bridging plug 3 and sets, gives up and 2 separate with bridging plug 3, and packer 1 sets, and then packing bottom fractured layer; After the fracture acidizing operation was finished, deblocking packer was transferred tubing string so that give up and 2 is connected deblocking bridging plug 3 with bridging plug 3; The upper lifting pipe post is finished the operation of bottom fractured layer to well head again, repeats above-mentioned steps, the last layer fractured layer is carried out operation, until the superiors' fractured layer is finished whole operations.
The present invention utilizes coiled tubing belt tension formula packer, can drag for bridging plug implements successively pressure break, by packer, the bridging plug up and down card layer to fractured interval, utilize coiled tubing fluid transfer and proppant to carry out pressure break, repeat deblocking and set packer, bridging plug and successively on carry coiled tubing, recycling positioner accurately location is treated the pressure break reservoir, thereby realize successively pressure break of thin interbed oil well, give full play to the advantage of continuous oil pipe operation equipment.Use coiled tubing and cooperate this process pipe string, can be to the unrestricted multiple fracturing acidizing treatment that carries out in oil well random layer position.
Detailed explanation for the respective embodiments described above, its purpose only is the present invention is made an explanation, so that can understand better the present invention, but, it is limitation of the present invention that these descriptions can not be construed to any reason, particularly, each feature of describing in different embodiments is mutual any combination also, thereby form other embodiments, except clear and definite opposite description is arranged, these features should be understood to can be applied in any one embodiment, and also not only are confined to described embodiment.
Claims (10)
1. a continuous oil pipe multi-layer fracturing acidification technique tubing string is used for the oil well multiple fracturing, it is characterized in that described tubing string comprises:
Bridging plug has bridging plug slips and the bridging plug packing element that can radially stretch, so that described bridging plug sets in the bottom of oil well oil reservoir;
Collar locator, be connected in the bottom of described bridging plug, this collar locator has support claw radially flexible under the elastic force effect, described support claw can fasten in the draw-in groove of down-hole casing and the formation of casing coupling junction, so that described bridging plug is positioned the precalculated position, down-hole by described collar locator;
Give up, this give up with the top of described bridging plug can dismounting be connected, when described bridging plug set finish after, described giving up is separated with described bridging plug;
Packer, comprise central tube, upper end at described central tube is provided with top connection, be used for connecting coiled tubing, lower end at described central tube is provided with lower contact, be used for connecting described upper end of giving up, bottom at described central tube is arranged with packing element, between described packing element and described top connection, be provided with slip assemblies, described slip assemblies inboard is provided with track pin, this track pin is slidingly matched with the chute group that is opened on the described central tube outer wall vertically, slides along described chute group track thereby drive described slip assemblies;
Driving described central tube by external force raises and decentralizes, so that the track pin of described slip assemblies is successively along the displacement that reciprocatingly slides of many parallel slideways in the described chute group, the stroke that raises and decentralizes to limit described central tube, and then drive successively that described collar locator location, described bridging plug set, described giving up separated with described bridging plug, and described packer setting.
2. continuous oil pipe multi-layer fracturing acidification technique tubing string as claimed in claim 1, it is characterized in that, described chute group comprises axially offers many parallel described slideways along described central tube, described slideway comprises long slideway and short slideway, be provided with two described short slideways between adjacent two described long slideways, the upper end of each described slideway is concordant and be connected.
3. continuous oil pipe multi-layer fracturing acidification technique tubing string as claimed in claim 2, it is characterized in that, described bridging plug comprises: bridging plug central tube, the described bridging plug slips that is consisted of by upper slips and lower slips, and be arranged at bridging plug packing element between described upper slips and the described lower slips; Described upper slips joins by a cone and described lower end of giving up, and described giving up radially expanded by the described upper slips of driving of exerting pressure to described cone, so that described bridging plug location; Described lower slips is slidable to be set on the described bridging plug central tube, the inboard of described lower slips is provided with the slide rail pin, on described bridging plug central tube, offer the sliding-rail groove group corresponding to described slide rail pin, described sliding-rail groove group comprises axially offers many parallel described sliding-rail grooves along described bridging plug central tube, described sliding-rail groove comprises long rail groove and short rail groove, between adjacent two described long rail grooves, be provided with a described short rail groove, the lower end of adjacent two described sliding-rail groove is concordant and be connected, described slide rail pin slides along described sliding-rail groove group, when described slide rail pin slides into the upper end of described long rail groove, described lower slips is exerted pressure to described bridging plug packing element, drive described bridging plug packing element and radially expand, so that described bridging plug sets.
4. continuous oil pipe multi-layer fracturing acidification technique tubing string as claimed in claim 3 is characterized in that described collar locator comprises:
The box cupling central tube;
Box cupling top connection and box cupling lower contact are arranged at respectively the two ends of described box cupling central tube;
On described box cupling central tube, be arranged with successively described support claw from top to bottom, and spring and positioning sleeve.
5. continuous oil pipe multi-layer fracturing acidification technique tubing string as claimed in claim 3, it is characterized in that, described giving up comprises: the top connection of giving up, inside wall bottom in the described top connection of giving up is plugged with connecting rod, lateral wall bottom in the described top connection of giving up is plugged with sheath, between described connecting rod and described sheath, be provided with spring, the sidewall phase contact of one end of described spring and the described top connection of giving up, its other end and the lower contact phase contact of giving up, in described connecting rod and the described upper slips of the slidable insertion of the described lower contact of giving up, the lower end of described connecting rod can the described cone of butt.
6. continuous oil pipe multi-layer fracturing acidification technique tubing string as claimed in claim 1 is characterized in that described slip assemblies comprises:
The slips body is towards described packing element setting;
Track pin, it is inboard to be located at described slips body;
Wiper block is fixedly arranged on the described slips body outer wall.
7. continuous oil pipe multi-layer fracturing acidification technique tubing string as claimed in claim 1 is characterized in that, described packer is the tension type packer.
8. continuous oil pipe multi-layer fracturing acidification technique tubing string as claimed in claim 1 is characterized in that, described bridging plug is that leather cup type can drag for bridging plug.
9. using method such as each described continuous oil pipe multi-layer fracturing acidification technique tubing string in the claim 1 to 8 is characterized in that the method may further comprise the steps:
For the first time transfer tubing string to the precalculated position below the bottom fractured layer of multiple fracturing oil well;
Upper lifting pipe post for the first time, the collar locator support claw by radially expansion fastens in the draw-in groove of down-hole casing and the formation of casing coupling junction, so that described bridging plug is positioned the precalculated position, down-hole by described collar locator;
For the second time transfer tubing string, the upper slips of bridging plug and lower slips pushing tow bridging plug packing element so that the expanded radially of bridging plug packing element so that bridging plug sets in the precalculated position, down-hole, applies hydraulic coupling simultaneously to giving up, are tending towards breaking away from bridging plug so that give up gradually;
Upper lifting pipe post for the second time, giving up is separated with bridging plug, so that give up and packer places the following position of the above and adjacent last layer fractured layer of bottom fractured layer;
Transfer for the third time tubing string;
Upper lifting pipe post for the third time, so that the slip assemblies pushing tow packing element of packer, so that the packing element expanded radially, so that packer setting is in more than the bottom fractured layer and the position below the adjacent last layer fractured layer;
The stroke that raises and decentralizes of the length control tubing string of the parallel slideway by the chute group drives the collar locator location, bridging plug sets, gives up and separate with described bridging plug successively, and packer setting, and then packing bottom fractured layer;
After the fracture acidizing operation was finished, deblocking packer was transferred tubing string so that give up and is connected the deblocking bridging plug with bridging plug; The upper lifting pipe post is finished the operation of bottom fractured layer to well head again, repeats above-mentioned steps, the last layer fractured layer is carried out operation, until the superiors' fractured layer is finished whole operations.
10. the using method of continuous oil pipe multi-layer fracturing acidification technique tubing string as claimed in claim 9, it is characterized in that, described chute group comprises axially offers many parallel described slideways along described central tube, described slideway comprises long slideway and short slideway, be provided with two described short slideways between adjacent two described long slideways, the upper end of adjacent two described slideway is concordant and be connected; Described bridging plug comprises: the described bridging plug slips that is consisted of by upper slips and lower slips, and be arranged at bridging plug packing element between described upper slips and the described lower slips; Described upper slips joins by a cone and described lower end of giving up, and described giving up radially expanded by the described upper slips of driving of exerting pressure to described cone, so that described bridging plug location; Described bridging plug slip sleeve is fixed on the bridging plug central tube that is connected to described upper slips lower end, described lower slips is slidable to be set on the described bridging plug central tube, the inboard of described lower slips is provided with the slide rail pin, on described bridging plug central tube, offer the sliding-rail groove group corresponding to described slide rail pin, described sliding-rail groove group comprises axially offers many parallel described sliding-rail grooves along described bridging plug central tube, described sliding-rail groove comprises long rail groove and short rail groove, between adjacent two described long rail grooves, be provided with a described short rail groove, the lower end of adjacent two described sliding-rail groove is concordant and be connected
When transferring tubing string for the first time, track pin is positioned at the initial position of chute group upper end; Simultaneously, the slide rail pin is positioned at the upper end of a short rail groove of sliding-rail groove group;
For the first time during the upper lifting pipe post, track pin slides into the bottom of the described short slideway of article one; Simultaneously, the slide rail pin slides into the bottom of this weak point rail groove;
When transferring tubing string for the second time, track pin slides into the upper end of the described short slideway of second; Simultaneously, the slide rail pin slides into the upper end of adjacent long rail groove;
For the second time during the upper lifting pipe post, track pin slides into the bottom of the described short slideway of second;
When transferring tubing string for the third time, track pin slides into the upper end of described long slideway;
During the upper lifting pipe post, track pin slides into the bottom of adjacent described long slideway for the third time.
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| CN105626022A (en) * | 2014-11-05 | 2016-06-01 | 中国石油化工股份有限公司 | Tubular column device used for oil-gas well and method used for finding production volume of oil-gas well |
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| CN105545255A (en) * | 2015-12-31 | 2016-05-04 | 中国石油天然气股份有限公司 | Novel oil-field long-acting water-exclusion-oil-exploiting pipe column |
| CN105545255B (en) * | 2015-12-31 | 2018-05-04 | 中国石油天然气股份有限公司 | A kind of novel oilfield is long-acting every adopting tubing string |
| CN108729906A (en) * | 2018-06-07 | 2018-11-02 | 西南石油大学 | A kind of hypotonic tight gas reservoir improvement backward modified isochronal test method |
| CN109736734A (en) * | 2019-01-10 | 2019-05-10 | 中国海洋石油集团有限公司 | It is a kind of to select to push locator by formula |
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