CN104695927B - A kind of coiled tubing and production tube compound tube string pressure break and completion integral method - Google Patents

A kind of coiled tubing and production tube compound tube string pressure break and completion integral method Download PDF

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Publication number
CN104695927B
CN104695927B CN201510038874.0A CN201510038874A CN104695927B CN 104695927 B CN104695927 B CN 104695927B CN 201510038874 A CN201510038874 A CN 201510038874A CN 104695927 B CN104695927 B CN 104695927B
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CN
China
Prior art keywords
string
pressure break
compound tube
coiled tubing
fracturing
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Application number
CN201510038874.0A
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Chinese (zh)
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CN104695927A (en
Inventor
姜勇
刘再锋
刘锐
张国庆
任国富
王在强
邵媛
蒙鑫
肖元相
李树生
赵倩云
叶亮
Original Assignee
中国石油天然气股份有限公司
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Priority to CN201510038874.0A priority Critical patent/CN104695927B/en
Publication of CN104695927A publication Critical patent/CN104695927A/en
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Publication of CN104695927B publication Critical patent/CN104695927B/en

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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/25Methods for stimulating production
    • E21B43/26Methods for stimulating production by forming crevices or fractures
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00Sealing or packing boreholes or wells
    • E21B33/10Sealing or packing boreholes or wells in the borehole
    • E21B33/12Packers; Plugs
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/11Perforators; Permeators
    • E21B43/114Perforators using direct fluid action on the wall to be perforated, e.g. abrasive jets

Abstract

The invention belongs to oil-gas field fracturing technical field, and in particular to a kind of coiled tubing includes with production tube compound tube string pressure break and completion integral method, specific steps:1)Under enter compound tube string;2)First interval sets;3)First interval abrasive perforating;4)First interval pressure break;5)Note fracturing fluid;6)After pressure break finishes first paragraph, fracturing string is above carried to second segment and design perforating site, repeat 2)‑5), complete the pressing crack construction of follow-up all construction intervals;7)After construction is finished, fracturing string is transferred to artificial bottom of a well position, steel ball is thrown from well head, make hydraulic releasing realize giving up;8)Discharge opeing and operation.After pressure break of the present invention is finished, next time flow string can be lacked, reservoir damage is reduced while shortening duty cycle.

Description

A kind of coiled tubing and production tube compound tube string pressure break and completion integral method
Technical field
The invention belongs to oil-gas field fracturing technical field, and in particular to a kind of coiled tubing and production tube compound tube string pressure Split and completion integral method.
Background technology
Hydraulic sand blasting fracturing technique beam hole, fracturing integrated, the agent technology as exploitation low permeability oil and gas field, with reference to Coiled tubing can dragging with pressure the characteristics of, the number of plies is unrestricted with transformation, pit shaft keeps the conventional skill such as big orifice after pressure break The incomparable advantage of art.
Wherein coiled tubing perforation, annular fracturing, the method for anchoring type mechanical packer packing have that packing is reliable, pressure break The features such as discharge capacity is big, efficiency of construction is high, using relatively broad.But the technique pressure break has finished out fracturing string, on the one hand deposits In larger construction risk, on the other hand, for low-voltage and low-yield gas well, it has hydro carbons condensed liquid or ground in process of production Layer water flows into shaft bottom, and due to Large Diameter Pipeline oil pipe, its fluid-carrying capability is poor(Produced gas can not be reached and continuously take liquid because flow velocity is too small Requirement), cause hydrops in pit shaft to be on the increase, shaft bottom back pressure constantly increases, sometimes even gas well can completely be killed so that Closing well, the interval of severe contamination pressure break, causes the injury to reservoir, directly influences gas well yield and coefficient of mining.
The content of the invention
It is an object of the invention to provide a kind of coiled tubing and production tube compound tube string pressure break and completion integral method, To simplify working procedure, injury of the kill-job to reservoir is reduced.
The technical scheme is that:
A kind of coiled tubing and production tube compound tube string pressure break and completion integral method, comprise the following steps:
Step 1)Under enter compound tube string:Connector, production tube, hydraulic pressure are connected with turn by coiled tubing lower end to lose Hand, mechanical casing collar locator, injector, packer, guiding check valve are combined into compound tube string, in lower going-into-well cylinder;
Step 2)First interval sets:Positioned by casing collar locator (CCL), by injector alignment first paragraph design perforation Then position, set packer carries the m of discharge capacity 1.03/ min, closes annular space gate, when pressure reaches more than 20MPa, termination of pumping 3 ~ 5min, observes casing pressure stable case, if pressure does not drop, illustrates that packer is effective;
Step 3)First interval abrasive perforating:After testing seal about packer is qualified, sleeve gate is opened, from the injection of compound tube string 0.2m3/ min perforating fluids, when perforating fluid to injector nozzle is apart from 200m, improve discharge capacity to 1.0 m3/ min, abrasive perforating, Perforating fluid is returned out from oil jacket annular space;
Step 4)First interval pressure break:After perforation is finished, sleeve gate, the m of control ring idle discharge amount 1.0 are closed3/ min, together When compound tube string injection discharge capacity be maintained at 0.1 m3/ min carries out burst test, and subsequent construction is continued if the layer ruptures, if broken Split it is unsuccessful, then continue perforation or acid filling liquid, until the layer rupture;
Step 5)After first interval formation fracture, fracturing fluid is injected from oil jacket annular space, while keeping the m of compound tube string 0.13/ Min injects base fluid;
Step 6)After pressure break finishes first paragraph, fracturing string is above carried to second segment and design perforating site, repeat step 2)- 5), complete the pressing crack construction of follow-up all construction intervals;
Step 7)After construction is finished, fracturing string is transferred to artificial bottom of a well position, steel ball is thrown from well head, treat that steel ball is dropped down onto After hydraulic releasing, compound tube serially add be depressed into hydraulic releasing realize give up, the tool string below hydraulic releasing falls in artificial bottom of a well, so Steel ball is flushed out pit shaft by oil jacket annular space huge discharge reacting cycle afterwards;
8)Compound tube string is above carried, coiled tubing and connector is unloaded, production tube wellhead assembly is hung on into, for oil gas The discharge opeing of well and operation.
The packer is Y241 packers.
Step 5)The base fluid is guanidine matrix liquid.
The wellhead assembly is made up of boll-weevil hanger, production tree connection.
This coiled tubing that the present invention is provided and production tube compound tube string pressure break and completion integral method, Neng Goushi Existing following effect:
Firstth, after pressure break is finished, underground tool string is given up and stays in artificial bottom of a well, and act coiled tubing and connector, Production tube is suspended on into wellhead assembly directly to be produced, next time flow string can be lacked, shorten duty cycle;
Secondth, after pressure break is finished, it is not necessary to flow string under kill-job, reservoir damage can be reduced.
Brief description of the drawings
Fig. 1 is compound tube string structure schematic diagram.
In figure:1st, coiled tubing;2nd, connector;3rd, production tube;4th, hydraulic releasing;5th, mechanical casing box cupling positioning Device;6th, injector;7th, packer;8th, guiding check valve;9th, wellhead assembly.
Specific embodiment
Embodiment 1:
It is an object of the invention to provide a kind of coiled tubing and production tube compound tube string pressure break and completion integral side Method, to simplify working procedure, reduces injury of the kill-job to reservoir.
Present embodiments provide a kind of coiled tubing as shown in Figure 1 with production tube compound tube string pressure break with completion integrally Change method, comprises the following steps:
Step 1)Under enter compound tube string:Connector 2, production tube 3, hydraulic pressure are connected with turn by the lower end of coiled tubing 1 Give up 4, mechanical casing collar locator 5, injector 6, Y241 packers, guiding check valve 8 is combined into compound tube string, under enter In pit shaft;
Step 2)First interval sets:Positioned by casing collar locator (CCL), injector 6 is directed at first paragraph design perforation Position, sets Y241 packers, then carries the m of discharge capacity 1.03/ min, closes annular space gate, when pressure reaches more than 20MPa, Termination of pumping 3min, observes casing pressure stable case, if pressure does not drop, illustrates that Y241 packers are effective;
Step 3)First interval abrasive perforating:After packer 7 tests sealing lattice, sleeve gate is opened, from the injection of compound tube string 0.2m3/ min perforating fluids, when perforating fluid is to 6 nozzle distance 200m of injector, improve discharge capacity to 1.0 m3/ min, abrasive perforating, Perforating fluid is returned out from oil jacket annular space;
Step 4)First interval pressure break:After perforation is finished, sleeve gate, the m of control ring idle discharge amount 1.0 are closed3/ min, together When compound tube string injection discharge capacity be maintained at 0.1 m3/ min carries out burst test, and subsequent construction is continued if the layer ruptures, if broken Split it is unsuccessful, then continue perforation or acid filling liquid, until the layer rupture;
Step 5)After first interval formation fracture, fracturing fluid is injected from oil jacket annular space, while keeping the m of compound tube string 0.13/ Min injects guanidine matrix liquid;
Step 6)After pressure break finishes first paragraph, fracturing string is above carried to second segment and design perforating site, repeat step 2)- 5), complete the pressing crack construction of follow-up all construction intervals;
Step 7)After construction is finished, fracturing string is transferred to artificial bottom of a well position, steel ball is thrown from well head, treat that steel ball is dropped down onto After hydraulic releasing 4, compound tube serially add be depressed into hydraulic releasing 4 realize give up, the tool string below hydraulic releasing 4 falls in artificial well Bottom, then oil jacket annular space huge discharge reacting cycle steel ball is flushed out into pit shaft;
8)Compound tube string is above carried, coiled tubing 1 and connector 2 is unloaded, production tube 3 is hung on into wellhead assembly 9, be used for The discharge opeing of Oil/gas Well and operation.
Wellhead assembly 9 is made up of boll-weevil hanger, production tree connection, belongs to known technology.
In sum, it is of the invention compared with existing process method, with advantages below:
Firstth, after pressure break is finished, underground tool string is given up and stays in artificial bottom of a well, and act coiled tubing, by production oil Pipe is suspended on wellhead assembly and is directly produced, and can lack next time flow string, shortens duty cycle;
Secondth, after pressure break is finished, it is not necessary to flow string under kill-job, reservoir damage can be reduced.
The method of testing that the present invention is not described in detail is conventional method of testing or existing method in the art, herein not Describe one by one.
It is exemplified as above be only to of the invention for example, do not constitute the limitation to protection scope of the present invention, it is all It is that design same or analogous with the present invention is belonged within protection scope of the present invention.

Claims (1)

1. a kind of coiled tubing and production tube compound tube string pressure break and completion integral method, it is characterised in that including with Lower step:
Step 1)Under enter compound tube string:By coiled tubing(1)Lower end is connected with connector in turn(2), production tube(3), liquid Pressure is given up(4), mechanical casing collar locator(5), injector(6), packer(7), guiding check valve(8)It is combined into combination Pipe string, in lower going-into-well cylinder;
Step 2)First interval sets:Positioned by casing collar locator (CCL), by injector(6)Alignment first paragraph design perforation position Put, set packer(7), then carry the m of discharge capacity 1.03/ min, closes annular space gate, when pressure reaches more than 20MPa, termination of pumping 3min, observes casing pressure stable case, if pressure does not drop, illustrates packer(7)Effectively;
Step 3)First interval abrasive perforating:Packer(7)After testing sealing lattice, sleeve gate is opened, from the injection of compound tube string 0.2m3/ min perforating fluids, when perforating fluid to injector(6)During nozzle distance 200m, discharge capacity to 1.0 m is improved3/ min, sandblasting is penetrated Hole, perforating fluid is returned out from oil jacket annular space;
Step 4)First interval pressure break:After perforation is finished, sleeve gate, the m of control ring idle discharge amount 1.0 are closed3/ min, while combination Pipe string injection discharge capacity is maintained at 0.1 m3/ min carries out burst test, if the layer rupture if continue subsequent construction, if rupture not into Work(, then continue perforation or acid filling liquid, until layer rupture;
Step 5)After first interval formation fracture, fracturing fluid is injected from oil jacket annular space, while keeping the m of compound tube string 0.13/ min is noted Enter base fluid;
Step 6)After pressure break finishes first paragraph, fracturing string is above carried to second segment and design perforating site, repeat step 2)-5), Complete the pressing crack construction of follow-up all construction intervals;
Step 7)After construction is finished, fracturing string is transferred to artificial bottom of a well position, steel ball is thrown from well head, treat that steel ball drops down onto hydraulic pressure Give up(4)Afterwards, compound tube is serially added and is depressed into hydraulic releasing(4)Realization is given up, hydraulic releasing(4)Following tool string falls in artificial well Bottom, then oil jacket annular space huge discharge reacting cycle steel ball is flushed out into pit shaft;
8)Compound tube string is above carried, coiled tubing is unloaded(1)And connector(2), by production tube(3)Hang on wellhead assembly(9), For the discharge opeing and operation of Oil/gas Well;
The packer(7)It is Y241 packers, step 5)The base fluid is guanidine matrix liquid, the wellhead assembly(9)By oil pipe Hanger, production tree connection composition.
CN201510038874.0A 2015-01-27 2015-01-27 A kind of coiled tubing and production tube compound tube string pressure break and completion integral method CN104695927B (en)

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CN107654207B (en) * 2017-11-16 2020-06-26 中国石油集团川庆钻探工程有限公司 Section method for fixed-point preset sand plug of coiled tubing horizontal well
CN107939376A (en) * 2017-11-27 2018-04-20 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 A kind of gas well gas testing operation integrated synthesis completion method
CN108952664A (en) * 2018-08-22 2018-12-07 中国石油集团渤海钻探工程有限公司 A kind of oil/gas well straight well orientation water-jet multistage fracturing method
CN111206878A (en) * 2018-11-21 2020-05-29 中国石油天然气股份有限公司 Well completion method
CN109630083A (en) * 2018-11-22 2019-04-16 西南石油大学 A kind of abrasive perforating annular fracturing ground control system and method
CN109339855B (en) * 2018-11-27 2020-11-24 中煤科工集团西安研究院有限公司 Perforating and staged fracturing method for continuous pipe in long-drill-hole casing for gas extraction in coal mine

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CN102562019A (en) * 2011-12-13 2012-07-11 中国石油集团川庆钻探工程有限公司井下作业公司 Sand jet perforation annular mechanical packing multilayer fracturing tool pipe column and modification process
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