CN106703744B - A kind of high pressure-bearing method for blocking of pressure break pit shaft - Google Patents
A kind of high pressure-bearing method for blocking of pressure break pit shaft Download PDFInfo
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- CN106703744B CN106703744B CN201611113041.7A CN201611113041A CN106703744B CN 106703744 B CN106703744 B CN 106703744B CN 201611113041 A CN201611113041 A CN 201611113041A CN 106703744 B CN106703744 B CN 106703744B
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- insulating liquid
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- 238000000034 method Methods 0.000 title claims abstract description 38
- 230000000903 blocking effect Effects 0.000 title claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 108
- 239000007788 liquid Substances 0.000 claims abstract description 71
- 239000003292 glue Substances 0.000 claims abstract description 42
- 239000000126 substance Substances 0.000 claims abstract description 40
- 238000012360 testing method Methods 0.000 claims abstract description 34
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 15
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 14
- 229910052710 silicon Inorganic materials 0.000 claims description 8
- 239000010703 silicon Substances 0.000 claims description 8
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 7
- 239000004568 cement Substances 0.000 claims description 7
- 239000003822 epoxy resin Substances 0.000 claims description 7
- 235000019441 ethanol Nutrition 0.000 claims description 7
- 239000003129 oil well Substances 0.000 claims description 7
- 229920000647 polyepoxide Polymers 0.000 claims description 7
- 235000010493 xanthan gum Nutrition 0.000 claims description 7
- 229920001285 xanthan gum Polymers 0.000 claims description 7
- 239000000230 xanthan gum Substances 0.000 claims description 7
- 229940082509 xanthan gum Drugs 0.000 claims description 7
- 239000004952 Polyamide Substances 0.000 claims description 6
- 239000005543 nano-size silicon particle Substances 0.000 claims description 6
- 229920002647 polyamide Polymers 0.000 claims description 6
- 229920002401 polyacrylamide Polymers 0.000 claims description 5
- 239000004615 ingredient Substances 0.000 claims description 4
- 150000001412 amines Chemical class 0.000 claims description 2
- 241000219112 Cucumis Species 0.000 claims 1
- 235000015510 Cucumis melo subsp melo Nutrition 0.000 claims 1
- FJJCIZWZNKZHII-UHFFFAOYSA-N [4,6-bis(cyanoamino)-1,3,5-triazin-2-yl]cyanamide Chemical compound N#CNC1=NC(NC#N)=NC(NC#N)=N1 FJJCIZWZNKZHII-UHFFFAOYSA-N 0.000 claims 1
- 238000010521 absorption reaction Methods 0.000 abstract description 3
- 238000011010 flushing procedure Methods 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 10
- 229920002907 Guar gum Polymers 0.000 description 5
- 235000010417 guar gum Nutrition 0.000 description 5
- 239000000665 guar gum Substances 0.000 description 5
- 229960002154 guar gum Drugs 0.000 description 5
- 239000003921 oil Substances 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 150000001408 amides Chemical class 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000001112 coagulating effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/424—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells using "spacer" compositions
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/426—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells for plugging
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/46—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement
- C09K8/467—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement containing additives for specific purposes
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/10—Nanoparticle-containing well treatment fluids
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- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Inorganic Chemistry (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- Geochemistry & Mineralogy (AREA)
- Sealing Material Composition (AREA)
Abstract
The present invention provides a kind of high pressure-bearing method for blocking of pressure break pit shaft, full envelope bridge plug tripping in borehole lower part is set first, clear water pressure testing determines leakage pressure and water absorption, later by coiled tubing down toward full envelope bridge plug plug face, just replace insulating liquid, inorganic gel, it is positive to replace clear water, inorganic gel is set to fill up the above well section in bridge plug plug face, coiled tubing is above mentioned later, carry out circulation well cleanup, clear water is just squeezed after the completion of well-flushing, by part inorganic gel squeeze into stratum build the pressure wait it is solidifying, then it plays out coiled tubing and carries out clear water pressure testing, if 30min internal drop is less than 0.5MPa, then block success, if 30min internal drop is more than or equal to 0.5MPa, then carry out the closure of chemical seal glue.The high pressure-bearing method for blocking of pressure break pit shaft provided by the invention can effectively block the mistake perforation holes in shale gas well fracturing process, while bearing capacity is strong, can satisfy the requirement of multistage pressure break under high pressure after closure.
Description
Technical field
The present invention relates to a kind of well fracturing technical field, in particular to the high pressure-bearing closure side of a kind of pressure break pit shaft
Method.
Background technique
The exploration and development of shale gas is gradually risen in China, and certain exploration and development scale is formd, and is entered fast
The stage of speed development.Need to carry out perforation, fracturing work after oil/gas well finishing drilling effectively to exploit shale gas, perforation has sometimes
The case where accidentally penetrating leads to borehole positional fault, cannot effectively carry out fracturing work, need to block borehole at this time,
And at this stage in the development process of Chinese shale gas field, the maximum pressure of pressure break has reached 95MPa, to the pressure-bearing energy of embrasure plugging
Force request is very high.
Method for blocking commonly used in the art is blocked using plugging material, will block material by operating tool string when construction
At material injection perforation holes, common plugging material has bridge joint plugging material, high worry to lose plugging material, chemical plugging material and nothing
Machine gel plugging material etc., but plugging material in the prior art is all in the oil/gas well for coming into the productive life
Use, for blocking high aquifer formation or high permeability zone, be not related to multistage fracturing work after the completion of blocking, thus to closure after
Bearing capacity is of less demanding, and the bearing capacity after in general the above method blocks is only 10~20MPa, is not able to satisfy multistage pressure
The high bearing requirements split, thus may not apply to the closure that perforation holes are missed in fracturing process.
Summary of the invention
In view of this, the high pressure-bearing of pressure break pit shaft that it is an object of that present invention to provide a kind of plugging effects is good, bearing capacity is strong
Method for blocking.
In order to achieve the above-mentioned object of the invention, the present invention the following technical schemes are provided:
The present invention provides a kind of high pressure-bearing method for blocking of pressure break pit shaft, comprising the following steps:
(1) it will be set at full envelope bridge plug tripping in perforation holes 20~50m of lower part, clear water determines leakage pressure to wellbore pressure test
Power and water suction volume；
(2) coiled tubing successively just replaces upper layer insulating liquid, inorganic gel, lower layer's insulating liquid, just down toward full envelope bridge plug plug face
Clear water is replaced, inorganic gel is made all to go out coiled tubing；
(3) it is mentioned on coiled tubing to circulation well cleanup at more than upper layer insulating liquid liquid level 40~60m；
(4) clear water is just squeezed, makes the well section between 10~30m of the full envelope bridge plug plug face to borehole of inorganic gel filling or more, closes
Well build the pressure wait it is solidifying；
(5) after the completion of the time is solidifying, act coiled tubing, clear water pressure testing measures water suction volume, in required pressure condition
Under, 30min internal drop is less than 0.5MPa, then blocks success；If 30min internal drop is more than or equal to 0.5MPa, it is close to carry out chemistry
The closure of sealing；
Preferred lower layer's insulating liquid and upper layer insulating liquid are independent including consisting of ingredient: 0.5~1 weight of tackifier
Part, 90~99 parts by weight of water；
Preferred tackifier include consisting of ingredient: 1~10 parts by weight of polyacrylamide, 60~100 weight of xanthan gum
Part and 0~20 parts by weight of guar gum；
The squeezing volume of preferred lower layer's insulating liquid and upper layer insulating liquid is independently 0.5~1m3。
Preferred inorganic gel includes following components: 65~100 parts by weight of G oil well class g cement, 5~8.3 weight of nano-silicon
Part, 5~20 parts by weight of liquid silicon, 1~5 parts by weight of citric acid, 20~40 parts by weight of water.
The volume of preferred inorganic gel is 1.5~2 times of water suction volume during step (1) clear water pressure testing.
It preferably builds the pressure and waits the solidifying time as 12~48h.
Preferred chemical seal glue block the following steps are included:
Upper layer insulating liquid, chemical seal glue and lower layer's insulating liquid are successively just replaced on inorganic gel plug face top, it is positive to replace clearly
Water makes chemical seal glue fill the above well section in inorganic gel plug face；
Clear water is just being squeezed to pressure is required, building the pressure, it is solidifying to wait；
It is described build the pressure wait it is solidifying after the completion of, act coiled tubing, clear water pressure testing, under the conditions of required pressure, 30min internal pressure
Drop is less than 0.5MPa, then blocks success；If 30min internal drop is more than or equal to 0.5MPa, repeatedly chemical seal glue blocks process,
Until blocking successfully；
Preferred chemical seal glue includes following components: 60~70 parts by weight of epoxy resin, are gathered at 10~15 parts by weight of ethyl alcohol
15~20 parts by weight of amide, 0.1~1 parts by weight of triethanolamine.
The volume of preferred chemical seal glue is 1.5~2 times of water suction volume during step (5) clear water pressure testing.
Preferred chemical seal glue builds the pressure during blocking waits the solidifying time as 24~72h.
The present invention provides a kind of high pressure-bearing method for blocking of pressure break pit shaft, will seal entirely under bridge plug tripping in perforation holes first
It is set at 20~50m of portion, clear water determines leakage pressure and water suction volume to wellbore pressure test；By coiled tubing down toward full envelope bridge plug
Plug face successively just replaces upper layer insulating liquid, inorganic gel, lower layer's insulating liquid, just replaces clear water, and inorganic gel is made all to go out continuous oil
Pipe；Coiled tubing is above mentioned to circulation well cleanup at more than upper layer insulating liquid liquid level 40~60m；Clear water is just squeezed, inorganic gel is filled out
Fill the well section between 10~30m of full envelope bridge plug plug face to borehole or more, closing well build the pressure wait it is solidifying；It waits after the completion of coagulating, acts continuous oil
Pipe, clear water pressure testing measure water suction volume, and under the conditions of required pressure, 30min internal drop is less than or equal to 0.5MPa, then block
Success；If 30min internal drop is more than or equal to 0.5MPa, the closure of chemical seal glue is carried out.Perforation holes provided by the invention
High pressure-bearing method for blocking can be blocked effectively and miss the borehole that perforation is formed in fracturing process, and strong operability, construction is simple, and
Work progress safety, bearing capacity can achieve 120MPa or more after closure, can satisfy multistage pressure break under high pressure after closure
It is required that.
Specific embodiment
The present invention provides a kind of high pressure-bearing method for blocking of pressure break pit shaft, comprising the following steps:
(1) it will be set at full envelope bridge plug tripping in perforation holes 20~50m of lower part, clear water determines leakage pressure to wellbore pressure test
Power and water suction volume；
(2) coiled tubing successively just replaces upper layer insulating liquid, inorganic gel, lower layer's insulating liquid, just down toward full envelope bridge plug plug face
Clear water is replaced, inorganic gel is made all to go out coiled tubing；
(3) it is mentioned on coiled tubing to circulation well cleanup at more than upper layer insulating liquid liquid level 40~60m；
(4) clear water is just squeezed, makes the well section between 10~30m of the full envelope bridge plug plug face to borehole of inorganic gel filling or more, closes
Well build the pressure wait it is solidifying；
(5) after the completion of the time is solidifying, act coiled tubing, clear water pressure testing measures water suction volume, in required pressure condition
Under, 30min internal drop is less than 0.5MPa, then blocks success；If 30min internal drop is more than or equal to 0.5MPa, it is close to carry out chemistry
The closure of sealing.
The present invention will be set at full envelope bridge plug tripping in perforation holes 20~50m of lower part, and clear water determines leakage to wellbore pressure test
Pressure and water suction volume.In the present invention, it is preferably to leak at 20~50m of leak source lower part that the running seals the position of bridge plug entirely
At point 25~55m of lower part；The number of the full envelope bridge plug is preferably 1~3, and more preferably 2, the pressure-bearing of each full envelope bridge plug
Ability is about 60~80MPa, and the full bridge plug that seals is more using number, and the bearing capacity of pit shaft is stronger, in the particular embodiment, can
To determine the number of full envelope bridge plug according to the specific requirement to pressure-bearing, it is ensured that the bearing capacity of pit shaft in the construction process.
After the completion of clear water pressure testing, coiled tubing down toward full envelope bridge plug plug face, is successively just replaced upper layer insulating liquid, nothing by the present invention
Machine gel, lower layer's insulating liquid, just replace clear water, and inorganic gel is made all to go out coiled tubing.In the present invention, lower layer's isolation
Liquid and upper layer insulating liquid are preferably independent including following components: 0.5~1 parts by weight of tackifier, 90~99 parts by weight of water；More preferably
For 0.6~0.8 parts by weight of tackifier, 95~98 parts by weight of water；The tackifier preferably include to include following components: polyacrylamide
0~20 parts by weight of 1~10 parts by weight of amine, 60~100 parts by weight of xanthan gum and guar gum；More preferably 3~8 weight of polyacrylamide
Part, 5~15 parts by weight of 70~90 parts by weight of xanthan gum and guar gum；The squeezing volume of lower layer's insulating liquid and upper layer insulating liquid is only
That vertical is preferably 0.5~1m3；More preferably 0.6~0.8m3。
Inorganic gel is placed between two sections of insulating liquids by the present invention, can be good at inorganic gel is avoided to contact with water causing
Performance decline, and it is too fast to prevent inorganic gel from missing in leak source, improves leak stopping success rate, while playing in high pressure
The effect of the lower steady conveying inorganic gel of difference, postposition insulating liquid can guarantee that insulating liquid rear end does not have remaining sealing leakage glue, avoid
The cementing not easy cleaning on the shaft in wall and coiled tubing outer wall of inorganic gel.
In the present invention, the inorganic gel preferably includes following components: 65~100 parts by weight of G oil well class g cement, nanometer
5~8.3 parts by weight of silicon, 5~20 parts by weight of liquid silicon, 1~5 parts by weight of citric acid, 20~40 parts by weight of water；More preferably G oil well
70~90 parts by weight of class g cement, 6~7 parts by weight of nano-silicon, 10~15 parts by weight of liquid silicon, 2~4 parts by weight of citric acid, water 25~
35 parts by weight；1.5~2 times for being pumped into volume and being preferably water suction volume during step (1) clear water pressure testing of the inorganic gel,
More preferably 1.6~1.8 times.
Inorganic gel materials formula in the present invention is simple, low in cost, and thermal adaptability is strong, and heat-resisting property can reach
To 130 DEG C, bearing capacity is strong, can bear the high pressure of 120MPa, can satisfy the requirement of multistage pressure break after closure.
The present invention by just replace clear water make inorganic gel all go out coiled tubings, make inorganic gel full of bridge plug plug face with
On well section, and come into full contact with bridge plug plug face.In the present invention, the positive volume for replacing clear water is coiled tubing content
The long-pending difference with upper layer insulating liquid in a specific embodiment of the present invention can be according in upper layer insulating liquid and coiled tubing
Volume determines the positive volume for replacing clear water.
After inorganic gel all goes out coiled tubings, the present invention above mentioned coiled tubing to more than upper layer insulating liquid liquid level 40~
Circulation well cleanup at 60m.In the present invention, it is preferable to use clear water to recycle 2~3 weeks for the circulation well cleanup, is cleaned by circulation well cleanup
Impurity in pit shaft, and cool down to pit shaft, prevent temperature in wellbore is excessively high from inorganic glue being caused to enter in borehole too early；The circulation
The volume of well-flushing clear water is preferably 20~30m3, more preferably 25~28m3。
After the completion of circulation well cleanup, the present invention just squeezes clear water, makes the full envelope bridge plug plug face to borehole of inorganic gel filling or more 10
Well section between~30m, closing well build the pressure wait it is solidifying.In the present invention, described to build the pressure that wait the solidifying time be preferably 12~48h, it is more excellent
It is selected as 24~36h；The pressure for just squeezing clear water is the pressure for opening stratum of measurement during step (1) clear water pressure testing；?
In specific embodiments of the present invention, the body for just squeezing clear water can be determined according to the volume of inorganic gel and the internal volume of coiled tubing
Product.
It is described build the pressure wait it is solidifying after the completion of, the present invention acts coiled tubing, and clear water pressure testing measures water suction volume, what is required
Under pressure condition, 30min internal drop is less than 0.5MPa, then blocks success；If 30min internal drop is more than or equal to 0.5MPa, into
The closure of row chemical seal glue.
In the present invention, the chemical seal glue closure preferably includes following steps:
Upper layer insulating liquid, chemical seal glue and lower layer's insulating liquid are successively just replaced on inorganic gel plug face top, it is positive to replace clearly
Water makes chemical seal glue fill the above well section in inorganic gel plug face；
Clear water is just being squeezed to pressure is required, building the pressure, it is solidifying to wait；
It is described build the pressure wait it is solidifying after the completion of, act coiled tubing, clear water pressure testing, under the conditions of required pressure, 30min internal pressure
Drop is less than 0.5MPa, then blocks success；If 30min internal drop is more than or equal to 0.5MPa, repeatedly chemical seal glue blocks process,
Until blocking successfully.
The present invention successively just replaces upper layer insulating liquid, chemical seal glue and lower layer's insulating liquid on inorganic gel plug face top, just
Clear water is replaced, chemical seal glue is made to fill the above well section in inorganic gel plug face.In the present invention, the chemical seal glue preferably wraps
Include following components: 60~70 parts by weight of epoxy resin, 10~15 parts by weight of ethyl alcohol, 15~20 parts by weight of polyamide, triethanolamine
0.1~1 parts by weight are more preferably 62~68 parts by weight of epoxy resin, 12~14 parts by weight of ethyl alcohol, 16~18 weight of polyamide
Part, 0.2~0.8 parts by weight of triethanolamine；The volume of the chemical seal glue is preferably water suction during step (5) clear water pressure testing
1.5~2 times of volume, more preferably 1.6~1.8 times；The component and volume of lower layer's insulating liquid and upper layer insulating liquid with it is upper
It is consistent to state scheme, details are not described herein.
Chemical seal glue formula in the present invention is simple, at low cost, is easy to construct, and thermal adaptability is strong, heat-resisting property
It can achieve 150 DEG C, bearing capacity is strong, can bear the high pressure of 160MPa, can satisfy multistage pressure break under high pressure after closure
It is required that.
After so that chemical seal glue is filled the above well section in inorganic gel plug face, the present invention is just squeezing clear water to pressure is required, and builds the pressure
Hou Ning.In the present invention, the curing time that builds the pressure that the chemical seal glue blocks process is preferably 24~72h, and more preferably 36
~60h, most preferably 48~55h；In a specific embodiment of the present invention, it can be determined according to the specific requirement to pressure and just squeezed
The volume of clear water.
It is described build the pressure wait it is solidifying after the completion of, the present invention acts coiled tubing, clear water pressure testing, under the conditions of required pressure,
30min internal drop is less than 0.5MPa, then blocks success；If 30min internal drop is more than or equal to 0.5MPa, repeatedly chemical seal glue
Closure process, until blocking successfully.
It is described in detail below with reference to high pressure-bearing method for blocking of the embodiment to pressure break pit shaft provided by the invention, but
It is that they cannot be interpreted as limiting the scope of the present invention.
Embodiment 1
Accidentally perforation holes block during certain oil field fracturing, 10 boreholes, between 3728~3729m of borehole well section, pressure testing feelings
Accumulation liquid measure under condition is 40MPa is 2.5m3, the pressure break requirement of pressure-bearing 90MPa is met after closure, borehole position temperature is
100℃。
Coiled tubing outer diameter 50.8mm, length 5200m, grade of steel 110, internal volume 7.6m3。
Implementation process is as follows:
Bridge plug will be sealed entirely at 3759m and 3760m, will be set, and act tool；
By coiled tubing at 3759m, 1m is just replaced3Insulating liquid, 3.75m3Inorganic gel, 1m3Insulating liquid；
It is positive to replace clear water 6.6m3, so that inorganic gel is all gone out coiled tubing, above mention coiled tubing to 3109m, just replace clear water
Circulation two weeks；
Clear water 3m is just squeezed under 40MP3, closing well builds the pressure 48h；
Pressure release acts coiled tubing, and plug tool is bored in tripping in, bores plug to 3739m, rises and to bore plug tool；
Clear water pressure testing 50MPa, 30min internal drop 5MPa, water absorption 1.5m3；It blocks not successfully, carries out chemical seal glue
It blocks；
By coiled tubing at 3739m, 0.5m is successively just replaced3Insulating liquid, 2.25m3Chemical seal glue, 0.5m3Insulating liquid
And 7.1m3Clear water makes chemical seal glue fill the above well section in inorganic gel plug face；
Coiled tubing is above mentioned to 3189m, is just recycled two weeks for clear water；
Clear water 1.5m is just squeezed under 50MPa3, closing well builds the pressure 48h；
Pressure release acts coiled tubing, and tripping in, which is bored plug tool and visited, fills in and bore plug to 3739m, rises and to bore plug tool；
Clear water pressure testing 90MPa, 30min internal drop 0.34MPa, blocks successfully；
Plug tool is bored in tripping in, bores Liu Sai and full envelope bridge plug, hands over well.
After the completion of closure, which is completed smooth 15 sections of pressure breaks, and highest frac pressure is 90MPa.
In the present embodiment, xanthan gum of the insulating liquid for 0.7 parts by weight, the polyacrylamide of 0.3 parts by weight, 99 parts by weight
Water；
Inorganic gel is 100 parts by weight of G oil well class g cement, 5 parts by weight of nano-silicon, 10 parts by weight of liquid silicon, 1 weight of citric acid
Part, 20 parts by weight of water；
Chemical seal glue is 70 parts by weight of epoxy resin, 14 parts by weight of ethyl alcohol, 15 parts by weight of polyamide, 1 weight of triethanolamine
Measure part.
Embodiment 2
Miss 1 section of perforation in certain shale gas well fracturing process, 30 boreholes, between 3152.3~3153.3m of borehole well section, borehole
Position temperature is 80 DEG C；
Bridge plug, clear water pressure testing are sealed in tripping in entirely respectively at 3184m and 3183m, and pressure testing situation is the accumulation liquid measure under 50MPa
For 3.5m3, it is desirable that after closure under 95MPa pressure, 30min internal drop is less than 0.5MPa.
Coiled tubing outer diameter 50.8mm, length 5200m, grade of steel 110, internal volume 7.6m3。
Implementation process is as follows:
Coiled tubing just replaces 1m at 3183m3Insulating liquid, 5.25m3Low viscous high-strength inorganic gel, 1m3 insulating liquid；
It is positive to replace clear water 6.6m3, so that inorganic gel is all gone out coiled tubing, above mention coiled tubing to 2383m, just replace clear water
Circulation two weeks；
Clear water 3m is just squeezed under 50MP3, closing well builds the pressure 48h；
Pressure release acts coiled tubing, and plug tool is bored in tripping in, bores plug to 3163m, rises and to bore plug tool；
Clear water pressure testing 70MPa, 30min internal drop 3.5MPa, water absorption 1.8m3；Block failed, progress chemical seal glue
It blocks；
Coiled tubing just replaces 0.5m at 3163m3Insulating liquid, 2.7m3Chemical seal glue, 0.5m3Insulating liquid and 7.1m3
Clear water makes chemical seal glue fill the above well section in inorganic gel plug face；
Coiled tubing is above mentioned to 2533m, is just recycled two weeks for clear water；
Clear water 1.8m is just squeezed under 70MPa3, closing well builds the pressure 48h；
Pressure release acts coiled tubing, and tripping in, which is bored plug tool and visited, fills in and bore plug to 3163m, rises and to bore plug tool；
Clear water pressure testing 95MPa, 30min internal drop 0.28MPa, blocks successfully；
Plug tool is bored in tripping in, bores Liu Sai and full envelope bridge plug, hands over well.
After the completion of closure, which is completed smooth 20 sections of pressure breaks, and highest frac pressure is 95MPa.
In examples detailed above, xanthan gum of the insulating liquid for 0.8 parts by weight, the guar gum of 0.1 parts by weight, poly- the third of 0.1 parts by weight
Acrylamide, the water of 99 parts by weight.
Inorganic gel is 100 parts by weight of G oil well class g cement, 8 parts by weight of nano-silicon, 15 parts by weight of liquid silicon, 5 weight of citric acid
Part, 30 parts by weight of water；
Chemical seal glue is 65 parts by weight of epoxy resin, 14.5 parts by weight of ethyl alcohol, 20 parts by weight of polyamide, triethanolamine
0.5 parts by weight.
Found by field experiment, which has good repairing effect, in different temperature and
To the repairing effect of perforation holes all it is obvious that can satisfy the requirement of construction condition under pressure condition.
Embodiment 3
Miss 1 section of perforation in certain shale gas well fracturing process, 20 boreholes, between 3725~3726m of borehole well section, borehole position
Temperature is 90 DEG C；
Bridge plug, clear water pressure testing are sealed in tripping in entirely respectively at 3756m and 3755m, and pressure testing situation is the accumulation liquid measure under 40MPa
For 3.0m3, it is desirable that after closure under 90MPa pressure, 30min internal drop is less than 0.5MPa.
Coiled tubing outer diameter 50.8mm, length 5200m, grade of steel 110, internal volume 7.6m3。
Implementation process is as follows:
Coiled tubing just replaces 1m at 3755m3Insulating liquid, 4.5m3Low viscous high-strength inorganic gel, 1m3Insulating liquid；
It is positive to replace clear water 6.6m3, so that inorganic gel is all gone out coiled tubing, above mention coiled tubing to 3383m, just replace clear water
Circulation two weeks；
Clear water 3m is just squeezed under 50MP3, closing well builds the pressure for 24 hours；
Pressure release acts coiled tubing, and plug tool is bored in tripping in, bores plug to 3755m, rises and to bore plug tool；
Clear water pressure testing 90MPa, 30min internal drop 0.45MPa, blocks successfully.
In examples detailed above, xanthan gum of the insulating liquid for 0.7 parts by weight, the guar gum of 0.2 parts by weight, poly- the third of 0.1 parts by weight
Acrylamide, the water of 99 parts by weight.
Inorganic gel is 100 parts by weight of G oil well class g cement, 6 parts by weight of nano-silicon, 10 parts by weight of liquid silicon, 1 weight of citric acid
Part, 20 parts by weight of water；
Chemical seal glue is 67 parts by weight of epoxy resin, 15 parts by weight of ethyl alcohol, 17 parts by weight of polyamide, 1 weight of triethanolamine
Measure part.
As seen from the above embodiment, the high pressure-bearing method for blocking of pressure break pit shaft provided by the invention, which can be blocked effectively, accidentally penetrates
Borehole, and bearing capacity is strong after the completion of closure, can satisfy the requirement of subsequent multistage fracturing work, and work progress is simple, peace
Entirely, leak stopping success rate is high.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (8)
1. a kind of high pressure-bearing method for blocking of pressure break pit shaft, which comprises the following steps:
(1) will be set at full envelope bridge plug tripping in perforation holes 20~50m of lower part, clear water to wellbore pressure test, determine leakage pressure and
Water suction volume；
(2) coiled tubing successively just replaces upper layer insulating liquid, inorganic gel, lower layer's insulating liquid down toward full envelope bridge plug plug face, positive to replace
Clear water makes inorganic gel all go out coiled tubing；The inorganic gel includes following components: 65~100 weight of G oil well class g cement
Part, 5~8.3 parts by weight of nano-silicon, 5~20 parts by weight of liquid silicon, 1~5 parts by weight of citric acid, 20~40 parts by weight of water；
(3) it is mentioned on coiled tubing to circulation well cleanup at more than upper layer insulating liquid liquid level 40~60m；
(4) clear water is just squeezed, the well section between 10~30m of the full envelope bridge plug plug face to borehole of inorganic gel filling or more is made, closing well is suppressed
Pressure is waited solidifying；
(5) after the completion of the time is solidifying, acting coiled tubing, clear water pressure testing measures water suction volume, under the conditions of required pressure,
30min internal drop is less than 0.5MPa, then blocks success；If 30min internal drop is more than or equal to 0.5MPa, chemical seal glue is carried out
Closure；The chemical seal glue includes following components: 60~70 parts by weight of epoxy resin, 10~15 parts by weight of ethyl alcohol, polyamides
15~20 parts by weight of amine, 0.1~1 parts by weight of triethanolamine.
2. method for blocking according to claim 1, which is characterized in that lower layer's insulating liquid and upper layer insulating liquid are independent
Including consisting of ingredient: 0.5~1 parts by weight of tackifier, 90~99 parts by weight of water；
The tackifier include consisting of ingredient: 1~10 parts by weight of polyacrylamide, 60~100 parts by weight of xanthan gum and melon
0~20 parts by weight of glue.
3. method for blocking according to claim 1, which is characterized in that the squeezing of lower layer's insulating liquid and upper layer insulating liquid
Volume is independently 0.5~1m3。
4. method for blocking according to claim 1, which is characterized in that the volume of the inorganic gel is step (1) clear water
1.5~2 times of water suction volume during pressure testing.
5. method for blocking according to claim 1, which is characterized in that described build the pressure waits the solidifying time as 12~48h.
6. method for blocking according to claim 1, which is characterized in that the chemical seal glue block the following steps are included:
Upper layer insulating liquid, chemical seal glue and lower layer's insulating liquid are successively just replaced on inorganic gel plug face top, clear water is just replaced, makes
Chemical seal glue fills the above well section in inorganic gel plug face；
Clear water is just being squeezed to pressure is required, building the pressure, it is solidifying to wait；
It is described build the pressure wait it is solidifying after the completion of, act coiled tubing, clear water pressure testing, under the conditions of required pressure, 30min internal drop is small
In 0.5MPa, then success is blocked；If 30min internal drop is more than or equal to 0.5MPa, repeatedly chemical seal glue blocks process, until
It blocks successfully.
7. method for blocking according to claim 1 or 6, which is characterized in that the volume of the chemical seal glue is step (5)
1.5~2 times of water suction volume during clear water pressure testing.
8. method for blocking according to claim 6, which is characterized in that building the pressure during the chemical seal glue closure, it is solidifying to wait
Time be 24~72h.
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| CN109083631B (en) * | 2018-09-14 | 2019-07-19 | 东北石油大学 | Utilize the device and method for repairing and mending in coiled tubing repairing cementing concrete crack |
| CN109630804B (en) * | 2018-12-05 | 2021-03-09 | 中煤第三建设集团机电安装工程有限责任公司 | Method for quickly plugging vertical shaft bobbin leakage point |
| CN111648740B (en) * | 2019-03-04 | 2022-07-05 | 中国石油天然气股份有限公司 | Oil pipe leakage stopping method |
| CN111720091B (en) * | 2019-03-21 | 2022-07-05 | 中国石油天然气股份有限公司 | Method for plugging stratum |
| CN112814612A (en) * | 2019-11-18 | 2021-05-18 | 中国石油天然气股份有限公司 | Sealing layer plugging method for oil well |
| CN112855070A (en) * | 2021-01-29 | 2021-05-28 | 北京永源思科技发展有限公司 | Method for treating integrity of shaft |
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| US7757765B2 (en) * | 2007-01-26 | 2010-07-20 | Schlumberger Technology Corporation | Downhole preparation and use of thixotropic cement slurries |
| CN102434125A (en) * | 2010-09-29 | 2012-05-02 | 中国石油化工股份有限公司 | Two-fluid-process based plugging construction method for well drilling |
| CN102838860A (en) * | 2011-06-23 | 2012-12-26 | 广东晨宝复合材料有限公司 | Formula and preparation method of wood-plastic composite material |
| CN104632124B (en) * | 2013-11-15 | 2017-06-06 | 中国石油天然气股份有限公司 | A kind of with serious pollution deep-well sandstone reservoir method for blocking |
| CN105038740A (en) * | 2015-07-23 | 2015-11-11 | 长江大学 | Solid-free water-base thermal insulation packer fluid suitable for deep water |
| CN105257241B (en) * | 2015-09-24 | 2018-03-09 | 中国石油天然气股份有限公司 | A kind of method of horizontal well cementing plug |
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