CN103277079B - A kind of tubing string of horizontal well fracturing completion and pressing crack construction method thereof - Google Patents
A kind of tubing string of horizontal well fracturing completion and pressing crack construction method thereof Download PDFInfo
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- CN103277079B CN103277079B CN201310218948.XA CN201310218948A CN103277079B CN 103277079 B CN103277079 B CN 103277079B CN 201310218948 A CN201310218948 A CN 201310218948A CN 103277079 B CN103277079 B CN 103277079B
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Abstract
The application provides a kind of tubing string of horizontal well fracturing completion, it is characterized in that, comprise ground hydraulic control device, sleeve pipe, be arranged on the oil pipe of described inside pipe casing, hydraulic line, hanger, the multiple pressing crack construction unit be connected successively at horizontal segment with described oil pipe, and the setting unit of tubing string bottom; Described pressing crack construction unit is disposed with hydraulic packer and hydraulic sliding sleeve; One end of described hydraulic line is connected with described ground hydraulic control device, and the other end is connected with hydraulic sliding sleeve with the hydraulic packer of pressing crack construction unit described in each; Described ground hydraulic control device is provided as the hydraulic pressure of the pressure change of control signal to described hydraulic sliding sleeve by described hydraulic line, to open or close each hydraulic sliding sleeve respectively.A kind of pressing crack construction method of horizontal well fracturing completion is also provided.The tubing string of the embodiment of the present invention need not pitching step by step, just can realize horizontal segment infinite stages staged fracturing; Later stage segmentation can also be realized produce simultaneously, very be applicable to marine staged fracturing.
Description
Technical field
The present invention relates to a kind of equipment of oil-gas field development, particularly relate to a kind of tubing string and pressing crack construction method thereof of horizontal well fracturing completion.
Background technology
The low-permeability oil deposit rich reserves of offshore oilfield, current recovery percent of reserves is lower, very urgent to the demand of staged fracturing of horizontal well technology, but because offshore oilfield production operation requires staged fracturing of horizontal well technology to possess, the operating cost of extreme high reliability and offshore oilfield is high, platform area is little, therefore the domestic staged fracturing of horizontal well also not carrying out offshore oilfield so far.
At present both at home and abroad the staged fracturing of horizontal well technology of field use has kind more than ten, and wherein applying maximum technology has three kinds, is packer-sliding sleeve staged fracturing technology, hydraulic jet perforation fracturing technique respectively and can bores bridging plug staged fracturing technology.
Packer-sliding sleeve multistage fracturing technology is divided into envelope multistage fracturing and pipe covering multistage fracturing in pipe.In pipe, envelope multistage fracturing is applicable to cased hole completion pressure break, general employing fracturing packer segmentation packing; Pipe covering multistage fracturing is applicable to open hole well, the inflatable packer segmentation packing of general employing.No matter be envelope or pipe covering pressure break in pipe, Construction Principle is basically identical, is all the needs according to reservoir exploitation, use packer that net horizontal section is separated into some sections, open sliding sleeve by pitching, pitching step by step from horizontal segment toe-end during fracturing construction, open sliding sleeve step by step and carry out pressure break.There is following problem in applying at the scene in this technology: (1), at barefoot interval, packer is completely setting under can not ensureing high pressure, can affect subsection efect; (2) adopt pitching step by step setting, pressure break hop count is restricted; (3) require high to hole quality, the drifting time is long, needs through 4-5 drifting after general drilling well, but still has the risk that bit freezing and tubing string can not put in place down.(4) the well section between two-stage packer all likely produces crack, and generation position, crack is uncontrollable.
Bridging plug multistage fracturing technology belongs to machine plugging separate stratum fracfturing technology, is applicable to cased well.There are technology and the product of comparative maturity in Oilfields service company, and bridging material is easily bore mill composite material.Bridging plug needs cable setting tool to set, and can realize setting perforating and fracturing connection and do.Its fracturing work process is: pit shaft prepares, and with the drifting of suitable dimension drift size gauge tool, first paragraph perforation, takes out perforating gun, carry out first paragraph pressure break, enter bridging plug and perforating gun under wireline operation, horizontal segment turn on pump pumping bridging plug is to precalculated position, igniting sets bridging plug, above carries perforating gun to precalculated position, perforation, trip out perforating gun and instrument, pitching is to ball seat, and packing presses layer, fracturing work, with the same manner, according to horizontal interval design segments number, descend bridging plug successively, perforation, pressure break.It is long that this technology also exists the engineering time in constructing at the scene, and the later stage cannot realize the shortcoming of selective production.
Jetting staged fracturing know-why is a kind of technology hydraulic jet perforation combined with fracturing, realizes waterpower packing, without the need to packer by high-speed jet.Jetting can realize accurate located perforating, arranges the many cracks of different size as required accurately.Jetting staged fracturing technology is divided into drawing type hydraulic jetting fracturing and fixed tubular column sliding sleeve hydraulic jetting fracturing.Hydraulic jetting fracturing technology can carry out sand fracturing in the horizontal well of bore hole, sieve tube completion, also can carry out in cased well, working security is high, in horizontal well, can press off many cracks with one-trip string quickly and accurately, hydrajet tool can be connected with conventional oil pipe or coiled tubing and access well.Hydraulic jet perforation technology has following limitation: (1) discharge capacity is restricted, pressure break small scale, is difficult to form long crack and map cracking; (2) nozzle easily weares and teares, and limits pressure break hop count; (3) later stage selective production cannot be realized.
As seen through the above analysis, above staged fracturing technology is difficult to the requirement meeting offshore oilfield high reliability and later stage selective production, in the urgent need to a kind of engineering time is short, pressure break segments is unrestricted, can realize the staged fracturing of horizontal well technology of selective production.
Summary of the invention
This application provides a kind of tubing string of horizontal well fracturing completion, comprise ground hydraulic control device, sleeve pipe, be arranged on the oil pipe of described inside pipe casing, hydraulic line, hanger, the multiple pressing crack construction unit be connected successively at horizontal segment with described oil pipe, and the setting unit of tubing string bottom;
Described pressing crack construction unit is disposed with hydraulic packer and hydraulic sliding sleeve;
One end of described hydraulic line is connected with described ground hydraulic control device, and the other end is connected with hydraulic sliding sleeve with the hydraulic packer of pressing crack construction unit described in each;
Described ground hydraulic control device is provided as the hydraulic pressure of the pressure change of control signal to described hydraulic sliding sleeve by described hydraulic line, to open or close hydraulic sliding sleeve described in each respectively.
Preferably, described pressing crack construction unit is provided with TT&C system, drive system and electric power system,
Described TT&C system, for detecting the pressure change of the hydraulic pressure in described hydraulic channel or hydraulic chamber, then sends instruction according to testing result to described drive system, to open and close described hydraulic sliding sleeve respectively;
Described electric power system provides electric energy for described TT&C system and drive system.
Preferably, described TT&C system comprises pressure sensor, clock and microprocessor,
Described pressure sensor changes for the pressure responding to hydraulic pressure and produces pressure sensitive signal, and described pressure sensitive signal is sent to described microprocessor;
Time signal for recording the time of hydraulic pressure change, and is sent to described microprocessor by described clock;
Described microprocessor, according to described pressure sensitive signal and time signal, sends to described drive system and opens or the instruction of hydraulic sliding sleeve described in switch.
Preferably, described drive system comprises motor and transmission mechanism, and described motor opens or closes described hydraulic sliding sleeve by described transmission mechanism.
Preferably, described electric power system comprises lithium battery.
Preferably, described hydraulic sliding sleeve comprises top connection, lower contact, outer cylinder sheath and inner sliding sleeve, described top connection is carried out being connected and forming annular space with the upper end of described outer cylinder sheath, described lower contact is connected with the lower end of described outer cylinder sheath, and described inner sliding sleeve is in the inside of described outer cylinder sheath and between described top connection and described lower contact;
Described top connection is provided with the first hydraulic channel or hydraulic chamber that are connected with described hydraulic line;
Described TT&C system, drive system and electric power system are positioned at annular space;
Described TT&C system drives described inner sliding sleeve to rotate according to described control signal control-driven system, to open or close described hydraulic sliding sleeve.
Preferably, described outer cylinder sheath is connected by the first shear pin with described inner sliding sleeve.
Preferably, described hydraulic packer comprises central tube, and the upper cartridge, hydraulic locking mechanism and the lower seal packing element that set gradually up and down in the periphery of described central tube;
The two ends of described central tube are respectively arranged with described baffle ring or annular flange flange, and described baffle ring or annular flange flange are for stopping described upper cartridge or lower seal packing element;
Described central tube arranges described second hydraulic channel that promising described hydraulic locking mechanism provides hydraulic power, and described hydraulic locking mechanism is used for upwards compressing described upper cartridge and compressing described lower seal packing element downwards.
Preferably, described hydraulic locking mechanism comprises upper piston, lower piston, the second shear pin and seal cylinder sleeve,
Described upper piston and lower piston are arranged on the periphery of described central tube, the periphery of described upper piston and lower piston is arranged in described seal cylinder sleeve, the upper end of described seal cylinder sleeve is fixedly connected with described upper piston, and its lower end is connected with described lower piston by described second shear pin
Described central tube is provided with hydraulic pressure hole, and one end, described hydraulic pressure hole is connected with the second hydraulic channel, and the other end is connected with the annular housing between described upper piston and lower piston.
Preferably, the periphery of described lower piston is provided with lock ring, the inwall of described seal cylinder sleeve is provided with the annular groove matched with described lock ring.
Preferably, described ground hydraulic control device comprises Hydrautic pulse generator and master control panel,
The hydraulic pressure that described Hydrautic pulse generator provides described pressure to change in the mode of hydraulic impulse;
Described master control panel controls described Hydrautic pulse generator and produces the hydraulic impulse corresponding with hydraulic sliding sleeve described in each.
Preferably, described sleeve pipe is provided with eyelet pockety at horizontal segment.
The application also provides a kind of pressing crack construction method of above-mentioned tubing string, and this pressing crack construction method comprises:
The hydraulic pressure that described ground hydraulic control device provides pressure to change by described hydraulic line to described hydraulic sliding sleeve, TT&C system in described pressing crack construction unit detects the hydraulic pressure that pressure changes respectively, then instruction is sent according to testing result to the described drive system of control, to open and close described hydraulic sliding sleeve respectively, thus realize sleective fracturing stratum.
Preferably, this pressing crack construction method also comprises:
Described ground hydraulic control device provides hydraulic pressure by hydraulic line to hydraulic packer, sets described hydraulic packer.
Preferably, before described ground hydraulic control device provides the hydraulic pressure of hydraulic pressure or pressure change, perforation is carried out to needing the interval of pressure break, by described tubing string G.I.H, described hydraulic sliding sleeve is aimed at the perforated interval in described sleeve pipe, and described hydraulic packer aims at the non-perforated interval in described sleeve pipe, pitching in well, with pressure, described ball is sent into bottom horizontal segment, then setting described oil pipe.
Preferably, the hydraulic pressure of described pressure change is pulse hydraulic.
Preferably, after pressure break terminates, under enter flow string, selectively control the opening and closing of the hydraulic sliding sleeve in described pressing crack construction unit, realize selective production.
Compared with relevant technologies, the beneficial effect of the embodiment of the present invention is as follows:
(1) tubing string of the embodiment of the present invention, a ground hydraulic control device is provided with at well head place, impulse generator and master control panel, detection system and drive system is provided with in underground sliding sleeve, the hydraulic pressure (as control signal) of pressure change is produced by ground hydraulic control device, pass to the pressure sensor in each pressing crack construction unit of down-hole horizontal section, pressure sensor produces signal to clock and microprocessor, after clock and microprocessor receive respective pressure signal, by the closedown of drive system hydraulic control sliding sleeve with open, just can open after hydraulic sliding sleeve in each pressing crack construction unit of i.e. horizontal segment receives respective pressure signal, thus reach the object on a certain stratum of pressure break.
After pressure break terminates, pitching can also to give up tieback hanger, close hydraulic line simultaneously, when entering flow string down afterwards, sealing plug can dock with hanger, realizing selective control the opening or closing of individual hydraulic sliding sleeve separately, realizing selective production when producing.
The tubing string of the embodiment of the present invention, can realize completion tubular column and the process of infinite stages staged fracturing, and especially adopt ground pulse hydraulic to control, the engineering time is short, and reliability is high; This fracturing string can also realize later stage segmentation production simultaneously, is very applicable to marine staged fracturing.
(2) because the tubing string of the embodiment of the present invention and the hydraulic pressure (pulse hydraulic) of hydraulic sliding sleeve employing pressure change are as control signal, can pitching step by step, just horizontal segment infinite stages staged fracturing can be realized, therefore pressing crack construction unit number is unrestricted, can arrange multiple construction cell number.
(3) concerning offshore oilfield, the horizontal segment of the embodiment of the present invention adopts casing cementing and variable density perforation pockety, the reliability entered under improve tubing string.
(4) compared with bore hole staged fracturing technology, fracturing fluid can enter stratum from the multi-openings eyelet of each pressing crack construction unit, combine and can form map cracking, and fracture initiation position is controlled with fracturing technology.
(5) compared with hydraulic jet perforation fracturing technique, discharge capacity can from 2m
3/ min brings up to 6-8m
3/ min, improves pressure break scale, can realize the selective production in later stage simultaneously.
(6) with bores soon compared with bridging plug staged fracturing, for the horizontal well dividing 15 sections of pressure breaks, by from 15 days near 5 days engineering time, greatly can save the engineering time, and later stage selective production can be realized by fixed tubular column.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the tubing string of the horizontal well fracturing completion technique of the embodiment of the present invention;
Fig. 2 is the schematic diagram of the hydraulic sliding sleeve of the embodiment of the present invention;
Fig. 3 is the schematic diagram of the operating process of the hydraulic sliding sleeve of the embodiment of the present invention;
Fig. 4 is the schematic diagram of the hydraulic packer of the embodiment of the present invention;
Reference numeral: 1-ground hydraulic control device, 2-sleeve pipe, 3-oil pipe, 4-tieback hanger, 5-hydraulic line, 6-hydraulic sliding sleeve, 601-top connection, 602-lower contact, 603-outer cylinder sheath, 604-inner sliding sleeve, 605-first hydraulic channel, 606-pressure sensor, 607-clock and microprocessor, 608-motor, 609-spline, 610-first shear pin, 611-first sealing ring, 612-oversheath, 7-packer, 701-central tube, 702-annular flange flange, 703-baffle ring, the upper cartridge of 704-, 705-lower seal packing element, 706-upper piston, 707-lower piston, 708-seal cylinder sleeve, 709-second shear pin, 710-lock ring, 711-second sealing ring, 712-hydraulic pressure hole, 713-second hydraulic channel, 714-hydraulic line connector, 8-ball seat,
Detailed description of the invention
Hereinafter will be described in detail to embodiments of the invention by reference to the accompanying drawings.It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can be combined mutually.
As shown in Figure 1, the completion tubular column of the embodiment of the present invention comprises ground hydraulic control device, sleeve pipe 2, be arranged on the oil pipe 3 of sleeve pipe 2 inside, hydraulic line 5, tieback hanger 4, the multiple pressing crack construction unit be connected successively at horizontal segment with oil pipe 3, and the setting unit of tubing string bottom;
Pressing crack construction unit is disposed with hydraulic packer 7 and hydraulic sliding sleeve 6; The setting unit of tubing string bottom is disposed with the hydraulic packer 7 and ball seat 8 that are connected with oil pipe; Ball seat 8, hydraulic packer 7, hydraulic sliding sleeve 6, tieback hanger 4 are all threaded with oil pipe 3.
One end of hydraulic line 5 is connected with ground hydraulic control device 1, and the other end through the hydraulic packer 7 of each pressing crack construction unit, and is connected with the hydraulic sliding sleeve 6 of each pressing crack construction unit respectively by the arm of hydraulic line 5; In order to fixed hydraulic pipeline 5, can by hydraulic line 5 colligation on the outer wall of oil pipe 3.
Ground hydraulic control device 1 comprises Hydrautic pulse generator and master control panel.The hydraulic pressure that Hydrautic pulse generator provides pressure to change in the mode of hydraulic impulse, master control panel is by the packing of hydraulic control hydraulic packer 7; Master control panel hydraulic control impulse generator produces the hydraulic impulse corresponding with each hydraulic sliding sleeve, and hydraulic sliding sleeve produces corresponding switch motion after receiving corresponding hydraulic pressure, thus realizes the switch of hydraulic sliding sleeve.
As shown in Figure 2, hydraulic sliding sleeve 6 comprises top connection 601, lower contact 602, outer cylinder sheath 603 and inner sliding sleeve 604, top connection 601 is carried out being connected and forming annular space with the upper end of outer cylinder sheath 603, top connection 601 is provided with the first hydraulic channel 605 or the hydraulic chamber be connected with hydraulic line 5, lower contact 602 is threaded connection with the lower end of outer cylinder sheath 603, and inner sliding sleeve 604 is positioned at the inside of outer cylinder sheath 603 and is positioned at the bottom of top connection 601.Inner sliding sleeve 604 is provided with the through hole matched with outer cylinder sheath 603, and when rotation inner sliding sleeve 604, when making its through hole relative with the through hole of outer cylinder sheath 603, the pipeline space in inner sliding sleeve 604 is connected with the space outerpace of outer cylinder sheath 603, and namely hydraulic pressure is in open mode; When rotation inner sliding sleeve 604, when the through hole of its through hole and outer cylinder sheath 603 is staggered, the pipeline space in inner sliding sleeve 604 and outer cylinder sheath 603 space outerpace isolated, namely hydraulic sliding sleeve is in closed condition.Inner sliding sleeve 604 is connected with outer cylinder sheath 603 by the first shear pin 610, in order to make hydraulic sliding sleeve 6 possess stronger sealing performance, can arrange oversheath 612, be screwed in the periphery of outer cylinder sheath 603.In top connection 601 and the junction of outer cylinder sheath 603, the junction at lower contact 602 and outer cylinder sheath 603, seal can also be provided with between inner sliding sleeve 604 and outer cylinder sheath 603, as the first sealing ring 611.
The parts such as pressure sensor 606, clock and microprocessor 607, motor 608 and spline 609 are disposed with, visible Fig. 3 of concrete manipulation flow process of the correlation of parts, function and sliding sleeve switch in annular space.
Correlation and function: pressure sensor 606, clock and microprocessor 607 is the TT&C system of hydraulic sliding sleeve, pressure sensitive signal for detecting the pressure change of hydraulic pressure in the first hydraulic channel 605 or hydraulic chamber, and is sent to clock and microprocessor 607 by pressure sensor 606; The time that clock changes for recording hydraulic pressure, and by time signal tranmitting data register and microprocessor 607; Clock and microprocessor 607 open or close hydraulic sliding sleeve 6 according to pressure sensitive signal and time signal control-driven system.Motor 608 and spline 609 are the drive system of hydraulic sliding sleeve, and motor 608 can drive inner sliding sleeve 604 to rotate by spline 609, thus realizes the opening and closing of hydraulic sliding sleeve 6.Lithium battery is the electric power system of hydraulic sliding sleeve, and lithium battery is connected with motor 608 with microprocessor 607 with pressure sensor 606, clock respectively, and is provided electric energy for it.
Operating process concrete at work: ground hydraulic control device produces pulse hydraulic, the hydraulic sliding sleeve 6 to down-hole is transported to from well head, pressure sensor 606 and sense clock should after by signal transmission to clock and microprocessor 607, then instruction is sent to drive system again by clock and microprocessor 607, inner sliding sleeve 604 is driven to rotate by spline 609 after drive system receives instruction, first shear pin 610 is cut off, inner sliding sleeve 604 rotates to open position, then the passage of oil pipe 3 and combination of zones, can carry out the pressure break on this stratum.If inner sliding sleeve 604 opposite spin, inner sliding sleeve 604 can rotate to fastening position, makes hydraulic sliding sleeve be in off status.
Accompanying drawing 4 is structure elevations of packer, and the two ends that central tube 701 is provided with second hydraulic channel 713, second hydraulic channel 713 that can pass through for hydraulic pressure respectively hydraulic line 5 are connected.Conveniently hydraulic line is connected with hydraulic packer 7, the two ends of the second hydraulic channel 713 can be provided with hydraulic line connector 714.The periphery of central tube 701 be disposed with annular flange flange 702, on cartridge 704, hydraulic locking mechanism, lower seal packing element 705 and baffle ring 703.Annular flange flange 702 is one-body molded with central tube 701, for stopping upper cartridge 704; Baffle ring 703 is threaded with central tube 701, for stopping lower seal packing element 705.Hydraulic locking mechanism comprises upper piston 706, lower piston 707, second shear pin 709, seal cylinder sleeve 708 and lock ring 710.Upper piston 706 and lower piston 707 are arranged on the periphery of central tube 701, and the annular housing between upper piston 706 with lower piston 707 is connected with the second hydraulic channel 713 of central tube 701 by hydraulic pressure hole 712.The upper end of seal cylinder sleeve 708 is fixed on upper piston 706, and its lower end is connected with lower piston 707 by the second shear pin 709.Lock ring is arranged on the periphery of piston for 710 times, and seal cylinder sleeve 708 also arranges the annular groove matched with lock ring 710.For increasing the sealing performance of packing, between upper piston 706 and seal cylinder sleeve 708, between upper piston 706 and central tube 701, between lower piston 707 and seal cylinder sleeve 708, between lower piston 707 and central tube 701, be provided with seal, as the second sealing ring 711.
When hydraulic sliding sleeve 7 works; hydraulic pressure in central tube is delivered to the cavity between upper piston 706 and lower piston 707 through hydraulic pressure hole 712; when pressure reaches certain value; second shear pin 709 is cut off; upper piston 706 moves upward and upwards compresses upper cartridge 704; lower piston 707 moves downward and compresses lower rubber cylinder downwards; seal cylinder sleeve 708 drives lock ring 710 to move up simultaneously; after setting; lock ring 710 locks lower piston 707; the guarded by location of upper piston 706 and lower piston 707 is constant, and hydraulic packer 7 can keep sealing state, oil reservoir packing is opened.
Below to have the fractured horizontal well tubing string of three pressing crack construction unit, tubing string construction and control program is as follows:
During field conduct, first to needing the interval of pressure break to carry out perforation, then by tubing string G.I.H as shown in Figure 1, by the perforated interval in hydraulic sliding sleeve 6 alignment sleeve 2, hydraulic packer 7 is seated in the non-perforated interval in sleeve pipe 2, hydraulic line 5 is fixed on the outer wall of oil pipe 3, and upper end is connected with ground hydraulic control device 1, and lower end is connected to top connection 601 place of the hydraulic sliding sleeve 6 in each pressing crack construction unit through hydraulic packer 7.In the process of going into the well, in hydraulic line 5, keep certain pressure, to monitor the sealing of each joint of hydraulic line 5 always.
After tubing string G.I.H, drop into a ball, with pressure, ball is sent into bottom horizontal segment, well mouth oil pipe 3 is suppressed, and each hydraulic packer 7 sets, and sits simultaneously and hangs tieback hanger 4, horizontal well stratum is divided into several sections by hydraulic packer 7, and each self-sustaining is independent sealed.Then ground hydraulic control device 1 dozen of hydraulic pressure, suppress 10MPa, keep 10-20 minute, this pressure reaches three, down-hole hydraulic sliding sleeve, the TT&C system of 3# hydraulic sliding sleeve receives this instruction, drive systems hydraulic sliding sleeve 6 keeps "open" state, then now can start pressure break, when pressure break terminates, from ground hydraulic control device 1 dozen of hydraulic pressure to the 3rd section, suppress 6MPa, keep 5 minutes, suppress 10MPa, keep 5 minutes, the TT&C system of 3# hydraulic sliding sleeve receives this instruction, and drive systems hydraulic sliding sleeve keeps the state of closing.In like manner according to the program option that table 1 sets, open 2# hydraulic sliding sleeve successively and carry out pressure break, after pressure break, follow procedure is closed, and the opening and closing of 1# hydraulic sliding sleeve also carry out pressure break according to the program option of setting in advance.When three interval pressure breaks all terminate, when needing to return discharge fracturing fluid, suppress 25MPa from ground hydraulic control device 1, keep 10-20 minute, three sliding sleeves are all opened, and can carry out the row of returning or produce.
After pressure break terminates, can also pitching to give up tieback hanger 4, close hydraulic line 5, when entering flow string down afterwards, sealing plug can dock with hanger, just can produce simultaneously.When producing, the opening and closing of the hydraulic sliding sleeve 6 selectively in control fracturing construction cell, realize selective production.
After flush stage terminates, if need to carry out changing pump to produce, can suppress 20MPa from ground hydraulic control device 1, the time is greater than 5 minutes, then three hydraulic sliding sleeves are all closed, kill job is exempted from realization, now hanger can be given up, under enter machine and adopt pump, enter the artificial lift stage, machine is adopted tubing string and is docked the switch that can continue to control sliding sleeve at different levels with ground hydraulic impulse with bottom fracturing string, realizes selective production.
In addition, as backup means, the hydraulic sliding sleeve 6 of above-described embodiment can also be opened or closed by alternate manner, enter hydraulic open instrument or mechanical switch instrument as follows, at the elastic ratchet of the external surface of switching tools, ratchet can stretch out under action of hydraulic force, when certain sliding sleeve opened by needs, switching tools is connected on tubing string, under enter stepped locations in sliding sleeve, suppress from oil pipe, the ratchet of switching tools stretches out, be stuck on the interior step of sliding sleeve, then transfer tubing string and can open sliding sleeve, in like manner, upper lifting pipe post can close sliding sleeve, realize selective production.
Table 1
The control program of hydraulic sliding sleeve according to hydraulic pressure and the difference in control time, can have many kinds of permutation and combination, and the present invention only enumerates above-mentioned a kind of situation, and the assembled scheme of other pressure and time is also considered as embodiments of the invention.
Because above-described embodiment adopts the hydraulic pressure (pulse hydraulic) of pressure change as control signal, can pitching step by step, just can realize horizontal segment infinite stages staged fracturing, therefore pressing crack construction unit number is unrestricted, can arrange multiple construction cell number.Concerning offshore oilfield, horizontal segment adopts casing cementing and variable density perforation pockety, the reliability entered under improve tubing string.
Compared with bore hole staged fracturing technology, fracturing fluid can enter stratum from the multi-openings eyelet of each pressing crack construction unit, combine and can form map cracking, and fracture initiation position is controlled with fracturing technology.
Compared with hydraulic jet perforation fracturing technique, discharge capacity can from 2m
3/ min brings up to 6-8m
3/ min, improves pressure break scale, can realize the selective production in later stage simultaneously.
With bores soon compared with bridging plug staged fracturing, for the horizontal well dividing 15 sections of pressure breaks, by from 15 days near 5 days engineering time, greatly can save the engineering time, and later stage selective production can be realized by fixed tubular column.
Although the embodiment disclosed by the present invention is as above, the embodiment that described content just adopts for the ease of understanding the present invention, and be not used to limit the present invention.Technician in any the technical field of the invention; under the prerequisite not departing from the spirit and scope disclosed by the present invention; any amendment and change can be done what implement in form and in details; but scope of patent protection of the present invention, the scope that still must define with appending claims is as the criterion.
Claims (18)
1. a tubing string for horizontal well fracturing completion, is characterized in that, comprises ground hydraulic control device, sleeve pipe, is arranged on the oil pipe of described inside pipe casing, hydraulic line, hanger, the multiple pressing crack construction unit be connected successively at horizontal segment with described oil pipe, and the setting unit of tubing string bottom;
Described pressing crack construction unit is disposed with hydraulic packer and hydraulic sliding sleeve;
One end of described hydraulic line is connected with described ground hydraulic control device, and the other end is connected with hydraulic sliding sleeve with the hydraulic packer of pressing crack construction unit described in each;
Described ground hydraulic control device is provided as the hydraulic pressure of the pressure change of control signal to described hydraulic sliding sleeve by described hydraulic line, to open or close hydraulic sliding sleeve described in each respectively;
Wherein, described pressing crack construction unit is provided with TT&C system, drive system and electric power system,
Described TT&C system, for detecting the pressure change of the hydraulic pressure in described hydraulic channel or hydraulic chamber, then sends instruction according to testing result to described drive system, to open and close described hydraulic sliding sleeve respectively;
Described electric power system provides electric energy for described TT&C system and drive system;
Wherein, described TT&C system comprises pressure sensor, clock and microprocessor,
Described pressure sensor changes for the pressure responding to hydraulic pressure and produces pressure sensitive signal, and described pressure sensitive signal is sent to described microprocessor;
Time signal for recording the time of hydraulic pressure change, and is sent to described microprocessor by described clock;
Described microprocessor, according to described pressure sensitive signal and time signal, sends to described drive system and opens or the instruction of hydraulic sliding sleeve described in switch.
2. tubing string according to claim 1, wherein, described drive system comprises motor and transmission mechanism, and described motor opens or closes described hydraulic sliding sleeve by described transmission mechanism.
3. tubing string according to claim 1, wherein, described electric power system comprises lithium battery.
4. according to the tubing string in claim 1-3 described in any one, wherein, described hydraulic sliding sleeve comprises top connection, lower contact, outer cylinder sheath and inner sliding sleeve, described top connection is carried out being connected and forming annular space with the upper end of described outer cylinder sheath, described lower contact is connected with the lower end of described outer cylinder sheath, and described inner sliding sleeve is in the inside of described outer cylinder sheath and between described top connection and described lower contact;
Described top connection is provided with the first hydraulic channel or hydraulic chamber that are connected with described hydraulic line;
Described TT&C system, drive system and electric power system are positioned at annular space;
Described TT&C system drives described inner sliding sleeve to rotate according to described control signal control-driven system, to open or close described hydraulic sliding sleeve.
5. tubing string according to claim 4, wherein, described outer cylinder sheath is connected by the first shear pin with described inner sliding sleeve.
6. according to the tubing string in claim 1-3 described in any one, wherein, described hydraulic packer comprises central tube, and the upper cartridge, hydraulic locking mechanism and the lower seal packing element that set gradually up and down in the periphery of described central tube;
The two ends of described central tube are respectively arranged with baffle ring or annular flange flange, and described baffle ring or annular flange flange are for stopping described upper cartridge or lower seal packing element;
Described central tube arranges the second hydraulic channel that promising described hydraulic locking mechanism provides hydraulic power, and described hydraulic locking mechanism is used for upwards compressing described upper cartridge and compressing described lower seal packing element downwards.
7. tubing string according to claim 6, wherein, described hydraulic locking mechanism comprises upper piston, lower piston, the second shear pin and seal cylinder sleeve,
Described upper piston and lower piston are arranged on the periphery of described central tube, the periphery of described upper piston and lower piston is arranged in described seal cylinder sleeve, the upper end of described seal cylinder sleeve is fixedly connected with described upper piston, and its lower end is connected with described lower piston by described second shear pin
Described central tube is provided with hydraulic pressure hole, and one end, described hydraulic pressure hole is connected with the second hydraulic channel, and the other end is connected with the annular housing between described upper piston and lower piston.
8. tubing string according to claim 7, wherein, is provided with lock ring in the periphery of described lower piston, and the inwall of described seal cylinder sleeve is provided with the annular groove matched with described lock ring.
9. according to the tubing string in claim 1-3 described in any one, wherein, described ground hydraulic control device comprises Hydrautic pulse generator and master control panel,
The hydraulic pressure that described Hydrautic pulse generator provides described pressure to change in the mode of hydraulic impulse;
Described master control panel controls described Hydrautic pulse generator and produces the hydraulic impulse corresponding with hydraulic sliding sleeve described in each.
10. according to the tubing string in claim 1-3 described in any one, wherein, described sleeve pipe is provided with eyelet pockety at horizontal segment.
11. 1 kinds, as the pressing crack construction method of the tubing string in claim 1-3 as described in any one, is characterized in that, this pressing crack construction method comprises:
The hydraulic pressure that described ground hydraulic control device provides pressure to change by described hydraulic line to described hydraulic sliding sleeve, TT&C system in described pressing crack construction unit detects the hydraulic pressure that pressure changes respectively, then instruction is sent according to testing result to the described drive system of control, to open and close described hydraulic sliding sleeve respectively, thus realize sleective fracturing stratum.
12. pressing crack construction methods according to claim 11, wherein, this pressing crack construction method also comprises:
Described ground hydraulic control device provides hydraulic pressure by hydraulic line to hydraulic packer, sets described hydraulic packer.
13. pressing crack construction methods according to claim 11, wherein, before described ground hydraulic control device provides the hydraulic pressure of hydraulic pressure or pressure change, to needing the interval of pressure break to carry out perforation, by described tubing string G.I.H, described hydraulic sliding sleeve is aimed at the perforated interval in described sleeve pipe, described hydraulic packer aims at the non-perforated interval in described sleeve pipe, pitching in well, sends into bottom horizontal segment with pressure by described ball, then setting described oil pipe.
14. pressing crack construction methods according to claim 12, wherein, before described ground hydraulic control device provides the hydraulic pressure of hydraulic pressure or pressure change, to needing the interval of pressure break to carry out perforation, by described tubing string G.I.H, described hydraulic sliding sleeve is aimed at the perforated interval in described sleeve pipe, described hydraulic packer aims at the non-perforated interval in described sleeve pipe, pitching in well, sends into bottom horizontal segment with pressure by described ball, then setting described oil pipe.
15. pressing crack construction methods according to claim 11, wherein, the hydraulic pressure of described pressure change is pulse hydraulic.
16. pressing crack construction methods according to claim 12, wherein, the hydraulic pressure of described pressure change is pulse hydraulic.
17. pressing crack construction methods according to claim 11, wherein, after pressure break terminates, under enter flow string, selectively control the opening and closing of the hydraulic sliding sleeve in described pressing crack construction unit, realize selective production.
18. pressing crack construction methods according to claim 12, wherein, after pressure break terminates, under enter flow string, selectively control the opening and closing of the hydraulic sliding sleeve in described pressing crack construction unit, realize selective production.
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