CN106321050A - High efficiency fracturing method using coiled tubing water-jet and soluble rubber plugs - Google Patents
High efficiency fracturing method using coiled tubing water-jet and soluble rubber plugs Download PDFInfo
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- CN106321050A CN106321050A CN201510375493.1A CN201510375493A CN106321050A CN 106321050 A CN106321050 A CN 106321050A CN 201510375493 A CN201510375493 A CN 201510375493A CN 106321050 A CN106321050 A CN 106321050A
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Abstract
The invention provides a high efficiency fracturing method using coiled tubing water-jet and soluble rubber plugs. The high efficiency fracturing method includes a sandblast and perforation stage, an annulus sand fracturing stage, a soluble rubber plug injection stage, a replacement stage, a curing and pressure test stage, and a blowout stage. The soluble rubber plugs are used as sealing members, the number of fracturing segments is not limited, the situation that sand blocks pipes can be avoided, gel-breaking of the rubber plugs can be controlled during construction, gel-breaking and rapid flow-back can be achieved at the same, and the construction efficiency and the successful rate can be greatly improved.
Description
Technical field
The present invention relates to unconventionaloil pool and hide staged fracturing of horizontal well technical field, say further, relate to
Efficient fracturing process made by a kind of coiled tubing water-jet and solubility plug connection.
Background technology
Along with domestic and international unconventionaloil pool hides the fast development of development technique, Staged Fracturing Technique In Horizontal Wells technology
Level is further improved, and have also been developed multiple effective pressure break mode for different completion mode.Mesh
Anterior cannula completion staged fracturing of horizontal well mode mainly has packing in pumping bridging plug staged fracturing, well-case perforating pipe
Device staged fracturing, twin packer double envelope single pressure staged fracturing, water-jet staged fracturing and coiled tubing waterpower
Injection annular fracturing etc..
Every kind of pressure break mode all has himself adaptability.Pumping bridging plug staged fracturing is at shale gas horizontal well in segments
Being widely used in pressure, but to sleeve pipe, its construction requires that height, supporting technology are many, efficiency of construction is low, takes
All needed to replace a wellbore fluid with pumping bridging plug after height, and every section of pressure break, had a strong impact on fracture guide energy
Power；In well-case perforating pipe, after packer staged fracturing pressure, tubing string can not trip out, affect the production management in later stage with
Operation；Twin packer double envelope each section of staged fracturing tubing string to be dragged dividing potential drop of single pressure, open flow, tears the operations such as well head open
Affect efficiency of construction.Water-jet staged fracturing includes dragging tubing string water-jet staged fracturing, fixed tubular column
Water-jet staged fracturing.The dragging tubing string water-jet staged fracturing developed the earliest frequently plays down tube because of needs
Post, the engineering time is longer, and because nozzle life is less, adds sand small scale, apply fewer and feweri at home.
Fixed tubular column water-jet staged fracturing repeatedly plays lower tubular column because which obviating, and saves the time, and single hop adds sand
Scale is relatively large, obtains further genralrlization application in each oil field.But also send out in site operation in recent years
Also there is certain problem and shortage in existing single use fixed tubular column hydraulic jetting fracturing, it is the most right to specifically include that
In the well that strata pressure is high, after the preceding paragraph pressing crack construction terminates, it is necessary to long-time closing well diffusion pressure or little spray
Mouth open flow waits that well head pressure just can carry out next section of pressing crack construction after reducing to zero, the most inefficient；2. put
Spray the most too fast danger being i.e. susceptible to stratum or fractures sand sand card tubing string；3. should for net horizontal section
The well that power difference is big, the segmentation effectiveness of each section is also inevitably present some problems.
Coiled tubing water-jet annular fracturing by coiled tubing, hydraulic jet perforation, annular space sand fracturing,
The packing of sand plug or bottom packer packing are every combining, it is possible to increase efficiency of construction, reduce nozzle wear, fall
Low operation pressure, increases in unconventionaloil pool Tibetan fractured horizontal well transformations at home and abroad such as adding sand scale and obtains extensively
General application.On-the-spot application show using sand plug or bottom packer as closure mode still exist some problems and
Not enough.The packing of sand plug is affected by sand feeding equipment, and actual back-up sand amount is difficult to measure；Bigger to surface line abrasion；
For the reservoir that certain distance is less, back-up sand amount is little, and sand plug intensity is difficult to ensure that and controls；Construction needs after terminating
Communications centre washed-out sand plug, 1-2 section of at most can only constructing for a day, extend the activity duration, reduce efficiency of construction.The end
Portion's packer packing is complicated every tool string, and requires higher to sleeve pipe, the well of inapplicable casing deformation；In construction
Repeatedly setting, deblocking, require higher to packer itself, pressure break hop count is limited；Packer top in construction
Easily depositing sand, sand card tubing string risk is big.
Summary of the invention
For solving produced problem in prior art, the invention provides a kind of coiled tubing water-jet and can
Efficient fracturing process made by dissolubility plug connection.To solve existing coiled tubing water-jet annular fracturing construction medium sand
Plug packing and bottom packer packing, every the problem and shortage existed, improve efficiency of construction and success rate.
It is an object of the invention to provide a kind of coiled tubing water-jet and efficient pressure break side made by solubility plug connection
Method, the method includes:
In the abrasive perforating stage: carried abrasive perforating rifle lower going-into-well cylinder by coiled tubing, tubing string is checked and is made spray gun
Nozzle alignment first paragraph pressure break position, opens wellhead casing pipe relief line gate, the low discharge capacity of coiled tubing replace
Activated water, guarantees nozzles clear when coiled tubing injection discharge capacity is consistent with sleeve pipe relief line back flow volume；
Raising coiled tubing discharge capacity, to designing discharge capacity, is injected perforating fluid according to FRACTURING DESIGN and is carried out abrasive perforating；Sandblasting
After perforation terminates, retaining sleeve relief line gate is opened, and all replaces perforation sand to ground；According to this
Invention, the range of choice of described low discharge capacity has been known together by those skilled in the art, and therefore the present invention is to described
Low discharge capacity is not strict with and limits, typically at 0.5-1.0m3About/min.
The annular space sand fracturing stage: coiled tubing discharge capacity is down to 0.1-0.2m3/ min, above carries coiled tubing to
Two-stage nitration pressure break position, closes sleeve pipe relief line gate, oil jacket annular space inject prepad fluid according to design discharge capacity
Sand fracturing is carried out with load fluid；
Solubility plug injects the stage: adding after sand terminates, coiled tubing discharge capacity keeps 0.1-0.2m3/ min, by
Oil jacket annular space injects 2-3m3Reduce oil jacket annular space discharge capacity after displacement fluid and to design discharge capacity and inject solubility plug
Liquid, injection process guarantees that injection rate is accurately measured；
The replacement stage: until solubility plug liquid inject terminate after replace fracturing fluid base fluid, it is ensured that by required entirely
Portion's solubility plug liquid replaces between first paragraph pressure break position and second segment pressure break position；
Wait the solidifying and pressure testing stage: replacing after terminating, termination of pumping waits solubility plug plastic, and the lowest discharge capacity rises
Pump pressure testing, after pressure testing is qualified, opens wellhead casing pipe relief line gate, carries out second segment spray according to design
Sand perforation and pressure break；According to the present invention, the range of choice of described low discharge capacity has been total to by those skilled in the art
Knowing, therefore described low discharge capacity is not strict with and limits, typically at 0.5-1.0m by the present invention3About/min
?.
Repeat the above steps, completes the pressing crack construction of all well sections.
Under preferable case, the method for the invention also includes constructing the open flow stage after terminating until all well sections:
In the open flow stage: closing well carries out pressure diffusion in 40-60 minute, treat that whole solubility plug returns after breaking gel
Row.
Preparatory stage before construction can be carried out by the preparation that this area is conventional, preferably presses in the present invention
Herein below is carried out:
Preparatory stage before construction: according to pressure break hop count, prepare enough base fluid, crosslinked fluid, friendship needed for solubility plug
Joint control preparation and gel breaker etc., it is ensured that plug plastic and the broken glue time is controlled, intensity is reliable；Drifting and well-flushing
Being carried abrasive perforating rifle lower going-into-well cylinder by coiled tubing after qualified, tubing string is checked and is made spray tip alignment first
Section pressure break position；Operating personnel sets fracturing unit truck group and annular space injection manifold, connects high and low pressure pipeline, pipe
Converge；Surface line pressure testing, keep pressure 5min do not sting do not leak qualified.
Method of the present invention is by coiled tubing, hydraulic jet perforation, annular space sand fracturing and solubility
The fracturing process fast and effectively that plug packing step organically combines, it is therefore desirable to solubility plug have to
Ask enter before precalculated position can not plastic, and when entering precalculated position can Rapid gelation, this needs tight
Lattice accurately calculate according to pit shaft length and operational discharge capacity, and consumption must reach comprcssive strength used of constructing.
The broken glue time need to control after next section of pressing crack construction terminates.
Under preferable case, the preparation method of described solubility plug liquid includes: in presence of water,
At 60-90 DEG C, by the first thickening agent, the second thickening agent, cross-linking agent, oxygen scavenger, crosslinking controlling agent and broken
Colloid carries out solution crosslinking polymerization, wherein, the first thickening agent, the second thickening agent, cross-linking agent, oxygen scavenger,
The mass ratio of crosslinking controlling agent and gel breaker is (0.3-1): (6-12): (0.03-005): (0.05): (0.03-0.06):
(0.3-0.8)。
Wherein, described first thickening agent is preferably amphiprotic polyacrylamide, and described second thickening agent is preferably selected from
One or more in cationic monomer thickening agent, described cross-linking agent is preferably selected from PEI resin, C10-C30
Alkyl acrylate and N,N methylene bis acrylamide in one or more, described oxygen scavenger preferably selects
One or more in sodium sulfite, ammonium bisulfite and sodium sulfite, described crosslinking controlling agent is preferred
One or more in sodium thiosulfate, Potassium hyposulfite., Ammonium persulfate. and sodium peroxydisulfate, described broken
Colloid is preferably Ammonium persulfate..Above-mentioned each material all can be commercially available or public according to those skilled in the art
The method known prepares.
According to the method for the present invention, the gelation time of described solubility plug was the scope of 10 minutes-30 minutes
Interior controlled.The consumption of described solubility plug makes its comprcssive strength be more than 15MPa (solubility plug
Concrete consumption can determine according to reservoir temperature and comprcssive strength).Described solubility plug breaks the glue time and is
In the range of 2-48 hour controlled, can according to produced on-site require be adjusted.Generally, pressure
Within latter two hours, glue can be broken completely.
Invention effect:
(1) method of the present invention is by coiled tubing, hydraulic jet perforation, annular space sand fracturing and solubility
The fracturing process fast and effectively that plug packing step organically combines, it is achieved the mutual supplement with each other's advantages of multiple types of tools technique,
Reducing well head pressure, improve operational discharge capacity, increase and add sand scale, after pressure, direct open flow returns row, joint
The about engineering time, the problem that simultaneously solves sand card tubing string.
(2) using the solubility plug of optimal way of the present invention as packing mode, pressure break hop count is unrestricted,
Avoiding sand card tubing string completely, solubility plug described in work progress is in gelation time, broken glue time and resistance to compression
In intensity the most controlled, it is possible to achieve break glue, the quickly row of returning simultaneously, be greatly improved efficiency of construction and success rate；
(3) construction technology advantage of lower cost, contributes to cost efficiency, it is ensured that preferably economic benefit.
Detailed description of the invention
Below in conjunction with embodiment, further illustrate the present invention.
Embodiment:
Coiled tubing water-jet and solubility plug connection is used to make efficient fracturing process.Including:
Preparatory stage before construction: according to pressure break hop count, prepare enough base fluid, crosslinked fluid, friendship needed for solubility plug
Joint control preparation and gel breaker etc., it is ensured that plug plastic and the broken glue time is controlled, intensity is reliable；Drifting and well-flushing
Being carried abrasive perforating rifle lower going-into-well cylinder by coiled tubing after qualified, tubing string is checked and is made spray tip alignment first
Section pressure break position；Operating personnel sets fracturing unit truck group and annular space injection manifold, connects high and low pressure pipeline, pipe
Converge；Surface line pressure testing, keep pressure 5min do not sting do not leak qualified；
In the abrasive perforating stage: carried abrasive perforating rifle lower going-into-well cylinder by coiled tubing, tubing string is checked and is made spray gun
Nozzle alignment first paragraph pressure break position, opens wellhead casing pipe relief line gate, by the low discharge capacity of coiled tubing (0.5
m3/ min) for activated water, guarantee when coiled tubing injection discharge capacity is consistent with sleeve pipe relief line back flow volume
Nozzles clear；Raising coiled tubing discharge capacity, to designing discharge capacity, is injected perforating fluid according to FRACTURING DESIGN and is carried out sandblasting
Perforation；After abrasive perforating terminates, retaining sleeve relief line gate is opened, and all replaces perforation sand to ground
Face；
The annular space sand fracturing stage: coiled tubing discharge capacity is down to 0.1m3/ min, above carries coiled tubing to second segment
Pressure break position, closes sleeve pipe relief line gate, is injected prepad fluid by oil jacket annular space according to design discharge capacity and takes
Sand liquid carries out sand fracturing；
Solubility plug injects the stage: adding after sand terminates, coiled tubing discharge capacity keeps 0.1m3/ min, by oil jacket
Annular space injects 3m3Oil jacket annular space discharge capacity is reduced to 0.5m after displacement fluid3/min-1.0m3/ min also injects solubility
Plug liquid, the liquid capacity injecting solubility plug is the casing volume between two perforated intervals, injects
Journey guarantees that injection rate is accurately measured；The preparation method of described solubility plug liquid is: in the presence of water,
At 70 DEG C, by the first thickening agent non-ionic polyacrylamide (be called for short MC-1, molecular weight 6,500,000), second
Thickening agent crosslinked resin (being called for short JSM-1, molecular weight 5,000,000), cross-linking agent PEI resin, oxygen scavenger sulfurous
Acid sodium, crosslinking controlling agent sodium thiosulfate and gel breaker Ammonium persulfate. carry out solution crosslinking polymerization, wherein,
First thickening agent, the second thickening agent, cross-linking agent, oxygen scavenger, crosslinking controlling agent and the mass ratio of gel breaker
For 0.5:8:0.04:0.05:0.05:0.05.
The replacement stage: until solubility plug liquid inject terminate after replace fracturing fluid base fluid, it is ensured that by required entirely
Portion's solubility plug liquid replaces between first paragraph pressure break position and second segment pressure break position；
Wait the solidifying and pressure testing stage: replacing after terminating, termination of pumping waits 30min, after the complete plastic of solubility plug,
The lowest discharge capacity (0.5m3/ min) play pump pressure testing, pressure testing intensity reaches more than 15MPa, after pressure testing is qualified,
Open wellhead casing pipe relief line gate, carry out second segment abrasive perforating and pressure break according to design；
Repeat the above steps, completes the pressing crack construction of all well sections.
The open flow stage: after the construction of all well sections terminates, closing well carries out pressure diffusion, according to produced on-site need
Want, carry out, after whole solubility plugs thoroughly break glue (can break glue completely in after pressure two hours), the row of returning.
Claims (7)
1. efficient fracturing process made by a coiled tubing water-jet and solubility plug connection, it is characterised in that institute
The method of stating includes:
In the abrasive perforating stage: carried abrasive perforating rifle lower going-into-well cylinder by coiled tubing, tubing string is checked and is made spray gun
Nozzle alignment first paragraph pressure break position, opens wellhead casing pipe relief line gate, the low discharge capacity of coiled tubing replace
Activated water, guarantees nozzles clear when coiled tubing injection discharge capacity is consistent with sleeve pipe relief line back flow volume；
Raising coiled tubing discharge capacity, to designing discharge capacity, is injected perforating fluid according to FRACTURING DESIGN and is carried out abrasive perforating；Sandblasting
After perforation terminates, retaining sleeve relief line gate is opened, and all replaces perforation sand to ground；
The annular space sand fracturing stage: coiled tubing discharge capacity is down to 0.1-0.2m3/ min, above carries coiled tubing to
Two-stage nitration pressure break position, closes sleeve pipe relief line gate, oil jacket annular space inject prepad fluid according to design discharge capacity
Sand fracturing is carried out with load fluid；
Solubility plug injects the stage: adding after sand terminates, coiled tubing discharge capacity keeps 0.1-0.2m3/ min, by
Oil jacket annular space injects 2-3m3Reduce oil jacket annular space discharge capacity after displacement fluid and to design discharge capacity and inject solubility plug
Liquid, injection process guarantees that injection rate is accurately measured；
The replacement stage: until solubility plug liquid inject terminate after replace fracturing fluid base fluid, it is ensured that by required entirely
Portion's solubility plug liquid replaces between first paragraph pressure break position and second segment pressure break position；
Wait the solidifying and pressure testing stage: replacing after terminating, termination of pumping waits solubility plug plastic, and the lowest discharge capacity rises
Pump pressure testing, after pressure testing is qualified, opens wellhead casing pipe relief line gate, carries out second segment spray according to design
Sand perforation and pressure break；
Repeat the above steps, completes the pressing crack construction of all well sections.
Efficient pressure break side made by coiled tubing water-jet the most according to claim 1 and solubility plug connection
Method, it is characterised in that described method also includes constructing the open flow stage after terminating until all well sections:
In the open flow stage: closing well carries out pressure diffusion in 40-60 minute, treat that whole solubility plug returns after breaking gel
Row.
Coiled tubing water-jet the most according to claim 1 and solubility plug make efficient pressure break side
Method, it is characterised in that:
The preparation method of described solubility plug liquid includes: in presence of water, at 60-90 DEG C, by
One thickening agent, the second thickening agent, cross-linking agent, oxygen scavenger, crosslinking controlling agent and gel breaker carry out solution friendship
Connection polymerization, wherein, the first thickening agent, the second thickening agent, cross-linking agent, oxygen scavenger, crosslinking controlling agent and
The mass ratio of gel breaker is (0.3-1): (6-12): (0.03-005): (0.05): (0.03-0.06): (0.3-0.8).
Coiled tubing water-jet the most according to claim 3 and solubility plug make efficient pressure break side
Method, it is characterised in that described first thickening agent is amphiprotic polyacrylamide, described second thickening agent selected from sun from
One or more in sub-monomer, described cross-linking agent selected from PEI resin, the alkyl acrylate of C10-C30 and
One or more in N,N methylene bis acrylamide, described oxygen scavenger is selected from sodium sulfite, bisulfite
One or more in ammonium and sodium sulfite, described crosslinking controlling agent is selected from sodium thiosulfate, thiosulfuric acid
One or more in potassium, Ammonium persulfate. and sodium peroxydisulfate, described gel breaker is Ammonium persulfate..
Coiled tubing water-jet the most according to claim 1 and solubility plug make efficient pressure break side
Method, it is characterised in that the gelation time of described solubility plug is controlled in the range of 10 minutes-30 minutes.
Coiled tubing water-jet the most according to claim 1 and solubility plug make efficient pressure break side
Method, it is characterised in that the consumption of described solubility plug makes its comprcssive strength be more than 15MPa.
Coiled tubing water-jet the most according to claim 2 and solubility plug make efficient pressure break side
Method, it is characterised in that it is 2-48 hour that described solubility plug breaks the glue time.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108301818A (en) * | 2018-01-31 | 2018-07-20 | 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 no tool packing efficient staged fracturing method of horizontal well |
| CN108559467A (en) * | 2018-04-24 | 2018-09-21 | 中国石油天然气股份有限公司 | A kind of selectivityization blocks up displacement fluid and its application |
| CN109944578A (en) * | 2019-02-27 | 2019-06-28 | 中国石油天然气股份有限公司 | A kind of prefabricated pressure break replaces the preparation method and its construction technology of isolator |
| CN112012708A (en) * | 2019-05-29 | 2020-12-01 | 中国石油天然气股份有限公司 | Sand jam prevention soluble bridge plug fracturing process pipe column and construction method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108301818A (en) * | 2018-01-31 | 2018-07-20 | 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 no tool packing efficient staged fracturing method of horizontal well |
| CN108559467A (en) * | 2018-04-24 | 2018-09-21 | 中国石油天然气股份有限公司 | A kind of selectivityization blocks up displacement fluid and its application |
| CN109944578A (en) * | 2019-02-27 | 2019-06-28 | 中国石油天然气股份有限公司 | A kind of prefabricated pressure break replaces the preparation method and its construction technology of isolator |
| CN112012708A (en) * | 2019-05-29 | 2020-12-01 | 中国石油天然气股份有限公司 | Sand jam prevention soluble bridge plug fracturing process pipe column and construction method thereof |
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