Utility model content
In view of this, the purpose of this utility model is to provide a kind of coiled tubing multistage fracturing tool tubing string, to realize the object of the time shortening fracture acidizing.
For achieving the above object, the utility model provides following technical scheme:
A kind of coiled tubing multistage fracturing tool tubing string, comprise joint, give up, centralizer, spray gun, equalizing valve, bottom packer, friction pipe nipple, collar locator and guide shoe, wherein, described joint, described in give up, centralizer, spray gun, equalizing valve, bottom packer, friction pipe nipple, collar locator, guide shoe connect to form tool tubular column, wherein, described joint is connected with connected pipes and is positioned at the top of whole tool tubular column, and described spray gun and described equalizing valve are positioned on the packer of described bottom; When described tool tubular column sets, the bottom upper tubing string of packer and the inner passage of lower tubular column described in described equalizing valve packing; When described tool tubular column is carried, described equalizing valve is communicated with the upper tubing string of described bottom packer and the inner passage of lower tubular column.
Preferably, in above-mentioned coiled tubing multistage fracturing tool tubing string, described friction pipe nipple comprises the first noumenon, some brake pads and the first spring, described brake pad is arranged on described the first noumenon, and internal surface of sleeve pipe is close under the effect of described first spring, the length at described brake pad maximum outside diameter place is greater than 1 inch.
Preferably, in above-mentioned coiled tubing multistage fracturing tool tubing string, described collar locator comprises the second body, some fixture blocks and the second spring, described fixture block to be arranged on described second body and to be close to internal surface of sleeve pipe under the effect of described second spring, and the length at described fixture block maximum outside diameter place is not more than 1 inch.
Preferably, in above-mentioned coiled tubing multistage fracturing tool tubing string, described joint is CT joint.
Preferably, in above-mentioned coiled tubing multistage fracturing tool tubing string, describedly give up as machinery is given up, described machinery is given up and is comprised top connection, some shear pins and lower contact, wherein, connected by described shear pin between described top connection and described lower contact, when the axial load being applied to described shear pin reaches rated value, described shear pin is cut off, and described top connection is separated with described lower contact.
Preferably, in above-mentioned coiled tubing multistage fracturing tool tubing string, described centralizer has at least 2 righting strips, and its external diameter is than casing inner diameter extremely when young 3mm.
Preferably, in above-mentioned coiled tubing multistage fracturing tool tubing string, described spray gun comprises the 3rd body and some nozzles, and wherein, described nozzle is arranged on described 3rd body with certain phase angle, and with the inner space of described 3rd body.
Preferably, in above-mentioned coiled tubing multistage fracturing tool tubing string, described equalizing valve comprises urceolus, containment member and bottom tubing string, and sealing component is reciprocable under Axial Loads, when containment member is in an open position, described urceolus and the tubing string conducting of described bottom; When containment member is in sealing station, described urceolus and described bottom tubing string non-conduction.
Preferably, in above-mentioned coiled tubing multistage fracturing tool tubing string, described bottom packer is compression packer, described compression packer comprises tubing string, cone, seal, anchoring device, central tube, pin ring, guide finger and lower tubular column, wherein, described upper tubing string, cone, seal, anchoring device, pin ring, guide finger and lower tubular column are set in sequence on described central tube, when described tool tubular column sets, described seal compression, described cone contacts with anchoring device, and the external channel of upper tubing string and described lower tubular column described in packing; When described tool tubular column is carried, described seal shrinks, described anchoring device slip, and seal shrinks, the external channel conducting of described upper tubing string and described lower tubular column.
Coiled tubing multistage fracturing tool tubing string in the utility model, owing to being provided with equalizing valve and bottom packer, therefore, when after the transformation completing a target zone, when upper pressure-raising splits tool tubular column, the containment member of equalizing valve is in an open position, and on the packer of bottom, tubing string is communicated with lower tubular column, pressure balance; Therefore, compared with prior art, owing to not needing the internal pressure of adjustment means tubing string in the utility model, therefore, the time of construction is shortened.
Detailed description of the invention
Core of the present utility model is exactly disclose a kind of coiled tubing multistage fracturing tool tubing string, to realize the object of the time shortening fracture acidizing.Below, with reference to accompanying drawing, embodiment is described.In addition, the embodiment shown in below does not play any restriction effect to the utility model content described in claim.In addition, the solution that the full content of the formation below represented by embodiment is not limited to as the utility model described in claim is necessary.
As depicted in figs. 1 and 2, this coiled tubing multistage fracturing tool tubing string, comprise joint 1, give up 2, centralizer 3, spray gun 4, equalizing valve 5, bottom packer 6, friction pipe nipple 7, collar locator 8 and guide shoe 9, wherein, catcher 1, give up 2, centralizer 3, spray gun 4, equalizing valve 5, bottom packer 6, friction pipe nipple 7, collar locator 8 and guide shoe 9 connect to form tool tubular column, wherein, joint 1 is connected with connected pipes and is positioned at the top of whole tool tubular column, and spray gun 4 and equalizing valve 5 are positioned on the packer 6 of bottom; When tool tubular column sets, the upper tubing string 601 of packer 6 and the inner passage of lower tubular column 611 bottom equalizing valve 5 packing; When tool tubular column is carried, equalizing valve 5 is communicated with the bottom upper tubing string 601 of packer 6 and the inner passage of lower tubular column 611.
Coiled tubing multistage fracturing tool tubing string in the utility model, owing to being provided with equalizing valve 5 and bottom packer 6, therefore, when after the transformation completing a target zone, when upper pressure-raising splits tool tubular column, the containment member of equalizing valve 5 is in an open position, and on bottom packer 6, tubing string 601 is communicated with lower tubular column 611, pressure balance; Therefore, compared with prior art, owing to not needing the internal pressure of adjustment means tubing string in the utility model, therefore, the time of construction is shortened.
It should be noted that, joint 1, machinery give up 2, centralizer 3, spray gun 4, equalizing valve 5, bottom packer 6, friction pipe nipple 7, collar locator 8 and guide shoe 9 are linked in sequence composition coiled tubing multistage fracturing tool tubing string.Also can not according to being linked in sequence like this, as long as ensure that spray gun 4 and equalizing valve 5 can realize this tubing string function at bottom packer more than 6, but CT joint 1 need in the top of tubing string, and giving up 2 needs to be connected on above spray gun 4.
Coiled tubing multistage fracturing tool tubing string center tap 1 shown in Fig. 1 is in tool tubular column topmost, plays a part to connect coiled tubing 0 and bottom tubing string; Give up and 2 be configured in below joint 1, rated load can be realized and give up, particularly when tool tubular column meets card, make to give up 2 to slip out of the hand by applying axial load; Centralizer 3 is configured in gives up below 2, makes whole tool tubular column placed in the middle; Spray gun 4 is configured in below centralizer 3, has good Anti-erosion and backwash, takes at a high speed sand flow body penetrate sleeve-penetrating and inject construction liquid to stratum by injection; Equalizing valve 5 is configured in below spray gun 4, the inner passage of tubing string 601 and lower tubular column 611 on the packer 6 of packing bottom when tool tubular column sets; Upper carry tool tubular column time be communicated with lower tubular column 611 internal and external channel on packer, balance bottom packer 6 two-way pressure, be convenient to bottom packer 6 deblocking.Equalizing valve 5 additionally provides reacting cycle passage simultaneously, makes tool tubular column possess self-cleaning function.Bottom packer 6 is configured in below equalizing valve 5, and transfer tool tubular column and bottom packer 6 can be made to set, upper lifting pipe post can make bottom packer 6 deblocking, thus packing payzone is constructed.Friction pipe nipple 7 is arranged in below the packer 6 of bottom, reliable frictional force can be provided to carry out minor bottom packer 6 commutation and set.Collar locator 8 is arranged in below friction pipe nipple 7, accurately judges perforated zone depth by signal fluctuation obvious during casing coupling.Guide shoe 9 is arranged in tubing string bottom, guides tubing string to enter well.
In order to optimize such scheme, friction pipe nipple 7 comprises the first noumenon, some brake pads and the first spring, and brake pad is arranged on the first noumenon, and is close to internal surface of sleeve pipe under the effect of the first spring, and the length of brake pad is greater than 1 inch.The brake pad surface of the friction pipe nipple 7 in the utility model in embodiment is by specially treated, and rubbing surface tungsten carbide button or other similar high abrasion resisting materials, and abrasion resistance is extremely strong, and bottom packer 6 can be provided to set required stable frictional force.
Collar locator 8 comprises the second body, some fixture blocks and the second spring, and fixture block to be arranged on the second body and to be close to internal surface of sleeve pipe under the effect of the second spring, and the length of fixture block is greater than 1 inch.The claw of the collar locator 8 in the utility model embodiment passes through specially treated, and rubbing surface tungsten carbide button or other similar high abrasion resisting materials, abrasion resistance is extremely strong, can not only set by minor bottom packer 6, and by there being obvious signal fluctuation during casing coupling, the degree of depth of perforation layer position fragment position accurately can be detected.The utility model, by collar locator 8 accurately location and spray gun 4 perforation, can realize the meticulous pressure break to horizontal Thin oil sandwich.The main pressure break of oil pipe abrasive perforating rear sleeve, can realize fairly large pressure break.
In order to optimize such scheme, in above-mentioned coiled tubing multistage fracturing tool tubing string, joint 1 is CT joint 1.The CT joint 1 configured in the utility model can effectively connect coiled tubing 0 and tool tubular column, and slip-type designs, and has auto-lock function, and connect reliable, bearing load is high.
Giving up in the utility model 2 can be given up 2 or hydraulic releasing 2 for machinery, 2 to give up for machinery when giving up, machinery is given up and is comprised top connection, some shear pins and lower contact, wherein, connected by shear pin between top connection and lower contact, when the axial load being applied to shear pin reaches rated value, shear pin is cut off, and top connection is separated with lower contact.The machinery configured in the utility model is given up can when tubing string meets card, and by applying axial load, bottom tubing string is thrown off with coiled tubing 0 and is separated, reduce the loss, 2 load of giving up are adjustable flexibly.
Centralizer 3 has at least 2 righting strips, and its external diameter is than casing inner diameter extremely when young 3mm.The centralizer 3 configured in the utility model can ensure that tool tubular column is placed in the middle, makes spray gun 4 preforation tunnel rule.Maximum slotted density design simultaneously, meets maximum pump discharge sand fracturing requirement.
Spray gun 4 comprises the 3rd body and some nozzles, and wherein, nozzle is arranged on the 3rd body with certain phase angle, and with the inner space of the 3rd body.High pressure perforating fluid in oil pipe, by nozzle throttling, can be transformed into high-speed jet and be penetrated by sleeve pipe and wear by the spray gun 4 configured in the utility model.In order to extend application life tungsten carbide button's plate or other similar high abrasion resisting materials on spray gun 4 body of tool tubular column.
Equalizing valve 5 comprises urceolus, containment member and bottom tubing string, and sealing component is reciprocable under Axial Loads, when containment member is in an open position, and urceolus and bottom tubing string conducting; When containment member is in sealing station, urceolus and bottom tubing string non-conduction.The equalizing valve 5 that configures in the utility model inner passage of tubing string 601 and lower tubular column 611 on the packer 6 of packing bottom when bottom packer 6 sets, upper carry tool tubular column time be communicated with the internal and external channel of tubing string 601 and lower tubular column 611 on packer, balance bottom packer 6 two-way pressure.
Bottom packer 6 is compression packer, compression packer comprises tubing string 601, cone 605, seal 604, anchoring device 606, central tube 602, pin ring 609, guide finger 610 and lower tubular column 611, wherein, upper tubing string 601, cone 605, seal 604, anchoring device 606, pin ring 609, guide finger 610 and lower tubular column 611 are set in sequence on central tube 602, when tool tubular column sets, seal 604 compresses, cone 605 contacts with anchoring device 606, and the external channel of tubing string 601 and lower tubular column 611 in packing; When tool tubular column is carried, seal 604 shrinks, anchoring device 606 slip, and seal 604 shrinks, the external channel conducting of upper tubing string 601 and lower tubular column 611.
Central tube 602 is with length rail groove, the seal 604 is reciprocally repeatedly compressed, pressing down tubing string by mechanical force can make cone 605 contact with anchoring device 606, thus make anchoring device 606 grappling, continuing to strengthen downforce can make seal 604 compress, the external channel of tubing string 601 and lower tubular column 611 in packing; And on carry workpiece seal 604 can be made to shrink, anchoring device 606 slip, seal 604 shrinks, the external channel of tubing string 601 and lower tubular column 611 in connection.By applying axial load, be arranged on guide finger 610 on pin ring 609 can between length rail groove cyclic switching.Have hole or groove in length rail groove, sand setting can be made to be discharged into outside central tube 602 inner chamber or tool tubular column.
The bottom packer 6 configured in the utility model commutates flexibly, above puts to put can realize repeatedly repeatedly setting deblocking, and the seal 604 of high withstand voltage high abrasion ensure that and sets reliably.Especially the sands-proof check design of central tube 602 uniqueness, has extremely strong sediment outflow ability.The utility model is by coiled tubing 0 Drag tool tubing string, and bottom packer 6 can set the feature of deblocking repeatedly, can realize once entering well repeatedly running fix packing different layers position, and one time tool tubular column completes multistage transformation, and construction rapidly and efficiently.
Guide shoe 9 enters in well process to play guiding function at tool tubular column, and it is airflow design, possesses good guided bone.
The invention also discloses a kind of coiled tubing multistage fracturing tool tubing string construction method, adopt the coiled tubing multistage fracturing tool tubing string described in above-mentioned arbitrary technical scheme, described construction method comprises:
Step 10: internal surface of sleeve pipe, well-flushing are scraped in jack rabbit drifting, pipeline scraper, clean pit shaft;
Step 11: install coiled tubing 0;
Step 12: tool tubular column enters well, walk pump pressure testing qualified after tool tubular column is lowered into below the target zone degree of depth, then coiled tubing 0 is carried on, the signal fluctuation that the collar locator 8 in viewing tool tubing string produces through box cupling, calibration bottom packer 6 setting depth;
Step 13: above put put tool tubular column set bottom packer 6, now equalizing valve 5 closes the inner passage of its underpart tubing string, and the spray gun 4 on bottom packer 6 top targeted by the layer position that will transform, and suppresses and test envelope after bottom packer 6 sets;
Step 14: after testing involution lattice, pumps into load fluid by coiled tubing 0, to target zone position perforation, penetrates sleeve-penetrating, the order number of perforation basis of time perforation sand and concentration and determine;
Step 15: after perforation completes, stops adding sand, pumps into fracturing base fluid, replace into annular space by load fluid residual in coiled tubing 0;
Step 16: respectively to annular space and the low discharge capacity pumping liquid of coiled tubing, carries out examination and squeezes, squeeze stratum; If examination is squeezed unsuccessfully, pump into a certain amount of acid solution by coiled tubing, to target zone corrosion, reduce formation fracture pressure;
Step 17: after stratum squeezes, pumps into fracturing fluid from annular space huge discharge, transforms target zone;
Step 18: after transformation, upper lifting pipe post, now the containment member of equalizing valve is in an open position, and on the packer of bottom, lower tubular column is communicated with, pressure balance, bottom packer anchoring device slip, and seal shrinks, and packing removed by bottom packer;
Step 19: upper lifting pipe post, to next target zone, repeats above-mentioned steps 10 to 18, until complete the transformation of the multiple target zones to a bite Oil/gas Well.
Because above-mentioned coiled tubing multistage fracturing tool tubing string has above-mentioned beneficial effect, the construction method of above-mentioned coiled tubing multistage fracturing tool tubing string is adopted also to have corresponding effect.Repeat no more herein.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the utility model.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein when not departing from spirit or scope of the present utility model, can realize in other embodiments.Therefore, the utility model can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.