CN104564001B - The method of many cluster pressure breaks of horizontal well and many cluster perforating and fracturing tubing strings of implementation the method - Google Patents
The method of many cluster pressure breaks of horizontal well and many cluster perforating and fracturing tubing strings of implementation the method Download PDFInfo
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- CN104564001B CN104564001B CN201410722643.7A CN201410722643A CN104564001B CN 104564001 B CN104564001 B CN 104564001B CN 201410722643 A CN201410722643 A CN 201410722643A CN 104564001 B CN104564001 B CN 104564001B
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/11—Perforators; Permeators
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/267—Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
Abstract
The invention discloses the method and many cluster perforating and fracturing tubing strings of implementation the method for a kind of many cluster pressure breaks of horizontal well.The abrasive perforating stage of the fracturing process, abrasive perforating is carried out to each perforated interval in same fracturing section according to order from the top down, and after last abrasive perforating, load fluid in many cluster perforating and fracturing tubing strings is replaced into the inclination section top to pit shaft by fracturing base fluid, without being replaced out from pit shaft, so when prepad fluid is injected in the annular space between pit shaft and many cluster perforating and fracturing tubing strings, perforation sand in load fluid will be certain to the cracking initiation in preceding unlatching closure, it is beneficial to and is opened in the crack of rear perforated interval, therefore the present invention will cause consistent with the crack opening degree of each shower hole section in section, the reliability and efficiency of construction of many cluster pressure breaks are segmented so as to improve.
Description
Technical field
The present invention relates to the method and many cluster perforating and fracturing tubing strings of implementation the method for a kind of many cluster pressure breaks of horizontal well.
Background technology
At present, the technique of staged fracturing is mainly coiled tubing staged fracturing and can bore bridging plug in domestic horizontal well pit shaft
Staged fracturing.Coiled tubing staged fracturing technique is coiled tubing abrasive perforating, and annular space sand fracturing is capable of achieving fairly large pressure
Split.After one section of pressure break terminates, stay one section of sand plug as isolation in pit shaft, dragging tubing string carries out pressure break to next purpose section, the work
The shortcoming of skill is long construction period, and sand plug rinses difficulty etc..Bridging plug staged fracturing technique can be bored can realize many cluster pressure breaks, using water
Power pumps cable and bridging plug tool string to target zone, and igniting sets bridging plug, above carries perforating gun to after purpose section perforation, a perforation hole
Rifle tool string, wellbore fracture, it has the disadvantage that pumping bridging plug tool string can cause larger crossing to replace to next section, and pit shaft pressure
Split, if it is more difficult construction abnormal conditions treatment occur.
Chinese patent literature 201210517644.9 discloses a kind of " many shower orifice rings of horizontal well coiled tubing hydraulic sand blasting
Sky plus sand multistage fracturing technology ", using entering to spray fracturing tool string under coiled tubing, annular space sand fracturing after perforation, Zhi Houshang
Next section of construction is mentioned, perforation and pressure break can be completed with one-trip string, and realize being segmented many cluster pressure breaks.Defect is that it uses list
, easily there is perforation imperfection and be laminated not open with causing in spray gun, packer used is hydraulic base sealed packer, and every section of pressure break terminates
After must carry out anti-flushing well after could above carry coiled tubing, and easily unsealed when coiled tubing discharge capacity is relatively low.In addition, penetrating
After the completion of hole, load fluid will completely be replaced out from pit shaft, and so in fracturing process, liquid is mainly from the first crack opened
Into, will so be unfavorable for that the crack of follow-up perforated interval is opened, so that the crack opening degree in each shower hole is different in fracturing section,
It is unfavorable for follow-up oil producing operation.
The content of the invention
It is an object of the invention to provide a kind of many clusters of horizontal well improved with the cracking degree in fracturing section middle and later periods shower hole
A kind of method of pressure break, while additionally providing many cluster perforating and fracturing pipes of the method for being exclusively used in and implementing many cluster pressure breaks of the horizontal well
Post.
In order to realize the above object the technical scheme of the method for many cluster pressure breaks of horizontal well is as follows in the present invention：
The method of many cluster pressure breaks of horizontal well, comprises the following steps：
Step one, it is each in the same fracturing section by many cluster perforating and fracturing tubing strings along order from the top down to pit shaft horizontal segment
Shower hole section gradually carries out abrasive perforating, many cluster perforating and fracturing tubing strings include the mechanical packer for concatenating from bottom to top and
Injector, and between adjacent abrasive perforating twice, load fluid fracturing base fluid in many cluster perforating and fracturing tubing strings is replaced out to well
After outside cylinder, above carry mechanical packer again and unsealed；
Step 2, after last time abrasive perforating, by load fluid fracturing base fluid in many cluster perforating and fracturing tubing strings replace into
The inclination section top of pit shaft；
Step 3, after prepad fluid is injected in the annular space between pit shaft and many cluster perforating and fracturing tubing strings, to being beaten in the annular space
Press and pressure break is carried out to each shower hole.
In step 3, while to fluid infusion in many cluster perforating and fracturing tubing strings.
In step 2, load fluid is replaced at inclination section above 200m positions.
In step one, before abrasive perforating is carried out to the first shower hole section, by pit shaft and many cluster perforating and fracturing pipes
Annular space between post is suppressed to carry out testing envelope；Envelope mode of testing before abrasive perforating is carried out to remaining shower hole section is used：By well
The cylinder slow release of gate, until pressure is down to than the last layer section low 5MPa of termination of pumping pressure, it is then rapid to close pit shaft gate, observation
Casing pressure situation of change, if set is pressed in 5min being not changed in, tests sealing lattice.
Before step one, many cluster perforating and fracturing tubing strings with the lower going-into-well of 10-15m/min cylinder, and when lower section is to 100m
Carry out setting test.
The technical scheme of many cluster perforating and fracturing tubing strings is as follows in the present invention：
Many cluster perforating and fracturing tubing strings, including injector and packer on the mouth of pipe of oil pipe lower end are serially connected in, packer is in
The lower section of injector, and packer is mechanical setting type packer.
Injector has two or more and is sequentially connected in series along the vertical direction.
Circulating valve is serially connected between injector and packer.
The lower section of packer has been sequentially connected in series brake pad, locator and target seeker from top to bottom.
The top of injector has been sequentially connected in series centralizer, standing valve, safety and has given up from bottom to top.
In the abrasive perforating stage in the present invention, sandblasting is carried out to each perforated interval in same fracturing section according to order from the top down and is penetrated
Hole, and after last abrasive perforating, replaced into making to pit shaft load fluid in many cluster perforating and fracturing tubing strings by fracturing base fluid
Oblique section top, without being replaced out from pit shaft, so injects preposition in the annular space between pit shaft and many cluster perforating and fracturing tubing strings
During liquid, the closure that the perforation sand in load fluid will be certain to the cracking initiation in preceding unlatching is beneficial to splitting in rear perforated interval
Seam is opened, compared to existing technology in the mode that the crack of perforated interval is opened directly is realized to being suppressed in pit shaft, the present invention will make
Obtain consistent with the crack opening degree of each shower hole section in section, the reliability and construction that many cluster pressure breaks are segmented so as to improve are imitated
Rate.
Brief description of the drawings
Fig. 1 is the structural representation of the embodiment of many cluster perforating and fracturing tubing strings of the invention.
Specific embodiment
The embodiment of the method for many cluster pressure breaks of horizontal well in the present invention：The method is a kind of suitable for fine and close low infiltration sandrock
The many shower orifice ring pneumatics cracking methods of coiled tubing sandblasting of the staged fracturing of the pit shaft well cementation completion horizontal well of oil-gas reservoir, with every section
As a example by two clusters, the implementation process of many shower hole annular fracturing string matching techniques of coiled tubing sandblasting is sketched, comprised the following steps：
1) many cluster perforating and fracturing tubing strings are assembled, and pump pressure testing to 70MPa, 30min internal pressures is walked to pressure break pipeline and well head
Drop is no more than 0.5MPa, and it is qualified that well head and pipeline are stingless, leak, ooze phenomenon, and to relief line pressure testing 35MPa, 30min internal pressure
Drop is no more than 0.5MPa, and it is qualified that pipeline is stingless, leak, ooze phenomenon, as shown in figure 1, many cluster perforating and fracturing tubing strings are included by upper
The coiled tubing 1 that is sequentially connected in series under, oil connection 2, safety give up 3, standing valve 4, the first centralizer 5, the second centralizer 6,
First injector 7, the second injector 8, circulating valve 9, packer 10, brake pad 11, mechanical positioners 12, target seeker 13, wherein
Packer 10 is mechanical setting type packer；
2) according to abrasive perforating and upper lifting pipe post requirement, control back pressure to be not less than with ground and set preceding well head pressure as control
Principle, gets out the oil nozzle of 2-14mm in advance, and starts pump truck, and stabilization pump truck output is in perforation discharge capacity 1.6m3/ min, records this
When oil nozzle gage pressure, the pressure value shown by the pressure gauge is the controllable back pressure of oil nozzle；
3) by many cluster perforating and fracturing tubing string lower going-into-wells cylinder, the running speed of many cluster perforating and fracturing tubing strings is with 10-15m/min
Be advisable, test set during decentralization 100m, and after setting and being completed, by many cluster perforating and fracturing tubing strings transfer to perforating depth with
Under, then at the uniform velocity above carry the coiled tubing 1 of many cluster perforating and fracturing tubing strings, the ripple that observation mechanical positioners 12 are produced by box cupling
It is dynamic, to calibrate the setting depth of packer 10；
4) after school is deeply qualified, set by the technical requirements of packer 10, that is, suppress 30MPa and test envelope, 10min pressure drops are less than
Sealing lattice are tested during 0.5MPa；
5) after testing sealing lattice, well head blowout oil nozzle manifold is opened, while improving perforation pumpage, keeps pit shaft and many showers
Annulus back pressure is not less than setting preceding pressure 2-5MPa in annular space between the fracturing string of hole, and by fracturing blender truck by 40/70 mesh stone
Sand mixes with sandblasting liquid, and the perforation lapping liquid that perforation pump truck stirs fracturing blender truck is by coiled tubing 1 with 1.6m3/min
Discharge capacity pump into well, to purpose of horizon perforation；
6) after the completion of perforation, stop plus sand, continue with 1.6m3The discharge capacity of/min pumps into fracturing base fluid, pumps into a pit shaft
The fracturing base fluid of height, pit shaft is replaced out by the load fluid of residual in coiled tubing 1；
7) after the displacement fluid in the first shower hole has been beaten, pit shaft gate is closed, above carries deblocking packer 10；
8) continue to transfer below many cluster perforating and fracturing tubing strings to fractured interval the second shower hole depth, then at the uniform velocity above carry
The coiled tubing 1 of many cluster perforating and fracturing tubing strings, and the fluctuation that mechanical positioners 12 are produced by box cupling is observed, to calibrate packer
10 setting depths are to design attitude；
9) after school is deeply qualified, set by the technical requirements of packer 10, wherein the first cluster tests envelope directly being beaten by pit shaft
Pressure tests envelope, and the second cluster is tested envelope and used：Can be changed by fracture pressure and operation pressure in the examination crowded stage and judge the second cluster again
Whether packer 10 sets, i.e., by the slow release of pit shaft gate, until pressure is down to than the last layer section low 5MPa of termination of pumping pressure,
Then it is rapid to close pit shaft gate, casing pressure situation of change is observed, if set is pressed in 5min being not changed in, test sealing lattice；
10) after testing sealing lattice, well head blowout oil nozzle manifold is opened, while improving perforation pumpage, keeps annulus back pressure not
Less than setting preceding pressure 2-5MPa, fracturing blender truck is stirred 40/70 mesh quartz sand with sandblasting liquid mixing perforation pump truck for fracturing blender truck work
Uniform perforation lapping liquid is mixed by coiled tubing 1 with 1.6m3The discharge capacity of/min is pumped into well, to purpose of horizon perforation；
11) after the completion of perforation, stop plus sand, continue with 1.6m3The discharge capacity of/min pumps into fracturing base fluid, by many shower pore pressures
The load fluid for splitting residual in tubing string replaces inclination section above 200m；
12) main pressure break flow is opened, is constructed by construction infusion program list, i.e., first beaten again to pumping into prepad fluid in mineshaft annulus
Pressure carries out pressure break, and in work progress, the pressure limiting 60MPa of coiled tubing 1, in mineshaft annulus Stress control pit shaft resistance to compression with
Interior, in fracturing process, coiled tubing 1 continues pump liquid by fluid infusion pump truck, and discharge capacity is 0.2-0.4m3/min；
13) after displacement fluid has been beaten, fluid infusion pumpage to 0.5m is improved3/ min, and above carry deblocking packer 10；
14) coiled tubing 1, more than circulation (5-14) step, to complete each section of construction below are above carried.
Perforation sand is not ejected annular space by fracturing process after the second shower hole is terminated in the present embodiment, and in prepad fluid rank
The certain closure of its cracking initiation to first unlatching of Duan Liyong, is beneficial to the unlatching in the second shower hole section crack, forms two
Crack, realizes the purpose of many cluster pressure breaks of segmentation；Using double spray guns, it is to avoid single spraying rifle perforation imperfection in existing process and cause
The defect that ground is laminated not open：Using mechanical set packer 10, without chock pressure difference, reliability is better than hydraulic base sealed for setting action
Without anti-flushing well after packer 10, and every section of pressure, efficiency of construction and security are substantially increased.
In the above-described embodiments, the fracturing process carries out every section of two cluster pressure breaks, and in other embodiments, each fracturing section is penetrated
The number of clusters in hole can also be more than two.
From above other embodiment, many cluster fracturing process of horizontal well of the invention can be implemented as follows：
Step one, it is each in the same fracturing section by many cluster perforating and fracturing tubing strings along order from the top down to pit shaft horizontal segment
Shower hole section gradually carries out abrasive perforating, many cluster perforating and fracturing tubing strings include the mechanical packer for concatenating from bottom to top and
Injector, and between adjacent abrasive perforating twice, load fluid fracturing base fluid in many cluster perforating and fracturing tubing strings is replaced out to well
After outside cylinder, above carry mechanical packer again and unsealed；
Step 2, after last time abrasive perforating, by load fluid fracturing base fluid in many cluster perforating and fracturing tubing strings replace into
The inclination section top of pit shaft；
Step 3, after prepad fluid is injected in the annular space between pit shaft and many cluster perforating and fracturing tubing strings, to being beaten in the annular space
Press and pressure break is carried out to each shower hole.
The embodiment of many cluster perforating and fracturing tubing strings in the present invention, in the present embodiment the structure of many cluster perforating and fracturing tubing strings with it is upper
The structure for stating many cluster perforating and fracturing tubing strings in embodiment is identical, therefore repeats no more.
Claims (5)
1. the method for many cluster pressure breaks of horizontal well, it is characterised in that comprise the following steps：
Step one, each shower in the same fracturing section by many cluster perforating and fracturing tubing strings along order from the top down to pit shaft horizontal segment
Hole section gradually carries out abrasive perforating, and many cluster perforating and fracturing tubing strings include the mechanical packer and the injection that concatenate from bottom to top
Device, and between adjacent abrasive perforating twice, by load fluid fracturing base fluid in many cluster perforating and fracturing tubing strings replace out to pit shaft it
After outer, above carry mechanical packer again and unsealed；
Step 2, after last time abrasive perforating, load fluid fracturing base fluid in many cluster perforating and fracturing tubing strings is replaced into pit shaft
Inclination section top, without being replaced out from pit shaft；
Step 3, after prepad fluid is injected in the annular space between pit shaft and many cluster perforating and fracturing tubing strings, to being suppressed in the annular space
Pressure break is carried out to each shower hole.
2. the method for many cluster pressure breaks of horizontal well according to claim 1, it is characterised in that in step 3, while to many
Fluid infusion in cluster perforating and fracturing tubing string.
3. the method for many cluster pressure breaks of horizontal well according to claim 1 and 2, it is characterised in that in step 2, load fluid
Replaced at inclination section above 200m positions.
4. the method for many cluster pressure breaks of horizontal well according to claim 1 and 2, it is characterised in that in step one, to
Before cluster perforated interval carries out abrasive perforating, carry out testing envelope by being suppressed to the annular space between pit shaft and many cluster perforating and fracturing tubing strings；
Envelope mode of testing before abrasive perforating is carried out to remaining shower hole section is used：By the slow release of pit shaft gate, until pressure drop
It is then rapid to close pit shaft gate to than the last layer section low 5MPa of termination of pumping pressure, casing pressure situation of change is observed, if set is pressed in 5min
Inside it is not changed in, then tests sealing lattice.
5. the method for many cluster pressure breaks of horizontal well according to claim 1 and 2, it is characterised in that before step one, many clusters
Perforating and fracturing tubing string carries out setting test with the lower going-into-well cylinder of 10-15m/min when lower section is to 100m.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410722643.7A CN104564001B (en) | 2014-12-03 | 2014-12-03 | The method of many cluster pressure breaks of horizontal well and many cluster perforating and fracturing tubing strings of implementation the method |
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| CN201410722643.7A CN104564001B (en) | 2014-12-03 | 2014-12-03 | The method of many cluster pressure breaks of horizontal well and many cluster perforating and fracturing tubing strings of implementation the method |
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| CN104564001A CN104564001A (en) | 2015-04-29 |
| CN104564001B true CN104564001B (en) | 2017-06-13 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105041274A (en) * | 2015-07-10 | 2015-11-11 | 中国石油大学(北京) | Short-range two-layer oil-gas reservoir commingled production technique |
| CN104989393A (en) * | 2015-07-14 | 2015-10-21 | 北京博达瑞恒科技有限公司 | Micro fracturing test method |
| CN105696994B (en) * | 2016-01-20 | 2018-06-12 | 中国石油化工股份有限公司 | The device of envelope pressure is sprayed for multidirectional pressure control type and includes its tubing string |
| CN107476791B (en) * | 2016-06-07 | 2019-05-17 | 中国石油化工股份有限公司 | A kind of shale gas horizontal well fracturing variable density cluster perforating methods and perforating gun |
| CN106761645B (en) * | 2016-12-28 | 2019-06-04 | 北京华晖盛世能源技术股份有限公司 | The structure of oil/gas well prospect pit hydraulic slotted liner technique test technology tubing string |
| CN109751018A (en) * | 2017-11-01 | 2019-05-14 | 中国石油化工股份有限公司 | A kind of construction method for normal pressure shale gas volume fracturing |
| CN109989723B (en) * | 2017-12-29 | 2021-11-02 | 中国石油天然气股份有限公司 | Multi-cluster perforation combined fracturing sealing device for blasting releasing |
| CN109184652A (en) * | 2018-09-25 | 2019-01-11 | 中国石油天然气股份有限公司 | Marmem pit shaft reproduces coiled tubing underseal refracturing 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 |
| CN110130867B (en) * | 2019-04-16 | 2021-08-31 | 中国石油天然气股份有限公司 | Staged multi-cluster fracturing method for slim-hole sidetracking horizontal well |
| CN111456691A (en) * | 2020-05-27 | 2020-07-28 | 中国石油天然气集团有限公司 | Method and device for single-section double-cluster continuous oil pipe bottom seal dragging fracturing |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9121272B2 (en) * | 2011-08-05 | 2015-09-01 | Schlumberger Technology Corporation | Method of fracturing multiple zones within a well |
| CN102691493B (en) * | 2012-06-05 | 2014-11-26 | 中国石油化工股份有限公司 | Continuous oil pipe sectional sand-blasting perforation casing fracturing pipe column and casing fracturing method |
| CN103032060A (en) * | 2012-11-08 | 2013-04-10 | 中国石油天然气股份有限公司 | Continuous oil pipe hydraulic sanding blasting multi-cluster perforation annular sanding staged fracturing process for horizontal well |
| CN104153753B (en) * | 2014-08-26 | 2017-04-19 | 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 | Horizontal well volume fracturing tubular column and method based on conventional oil tube pressure dragging |
| CN204436357U (en) * | 2014-12-03 | 2015-07-01 | 中国石油化工股份有限公司 | A kind of many showers hole fracturing string |
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