CN107939383A - A kind of method for expanding narrow ' Safe Density Windows - Google Patents
A kind of method for expanding narrow ' Safe Density Windows Download PDFInfo
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- CN107939383A CN107939383A CN201711124146.7A CN201711124146A CN107939383A CN 107939383 A CN107939383 A CN 107939383A CN 201711124146 A CN201711124146 A CN 201711124146A CN 107939383 A CN107939383 A CN 107939383A
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- 238000000034 method Methods 0.000 title claims abstract description 76
- 239000000463 material Substances 0.000 claims abstract description 90
- 239000000203 mixture Substances 0.000 claims abstract description 58
- 238000005553 drilling Methods 0.000 claims abstract description 52
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 49
- 239000012530 fluid Substances 0.000 claims abstract description 39
- 239000006004 Quartz sand Substances 0.000 claims abstract description 35
- 238000012856 packing Methods 0.000 claims abstract description 30
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 10
- 239000002245 particle Substances 0.000 claims description 70
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 38
- 239000003795 chemical substances by application Substances 0.000 claims description 31
- 238000007789 sealing Methods 0.000 claims description 30
- 239000003112 inhibitor Substances 0.000 claims description 21
- 230000009545 invasion Effects 0.000 claims description 21
- 238000003756 stirring Methods 0.000 claims description 20
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 19
- 125000000449 nitro group Chemical group [O-][N+](*)=O 0.000 claims description 16
- FQLQNUZHYYPPBT-UHFFFAOYSA-N potassium;azane Chemical group N.[K+] FQLQNUZHYYPPBT-UHFFFAOYSA-N 0.000 claims description 16
- 238000006277 sulfonation reaction Methods 0.000 claims description 16
- 229920002239 polyacrylonitrile Polymers 0.000 claims description 14
- 229920005989 resin Polymers 0.000 claims description 13
- 239000011347 resin Substances 0.000 claims description 13
- 229920000742 Cotton Polymers 0.000 claims description 12
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 12
- 244000144730 Amygdalus persica Species 0.000 claims description 11
- 235000006040 Prunus persica var persica Nutrition 0.000 claims description 11
- 239000000835 fiber Substances 0.000 claims description 11
- 241000196324 Embryophyta Species 0.000 claims description 9
- 239000002131 composite material Substances 0.000 claims description 9
- 239000000843 powder Substances 0.000 claims description 9
- 241000758789 Juglans Species 0.000 claims description 7
- 235000009496 Juglans regia Nutrition 0.000 claims description 7
- 235000020234 walnut Nutrition 0.000 claims description 7
- 239000004698 Polyethylene Substances 0.000 claims description 3
- 241000209140 Triticum Species 0.000 claims description 3
- 235000021307 Triticum Nutrition 0.000 claims description 3
- 229920002522 Wood fibre Polymers 0.000 claims description 3
- 235000013339 cereals Nutrition 0.000 claims description 3
- 239000008187 granular material Substances 0.000 claims description 3
- -1 polyethylene Polymers 0.000 claims description 3
- 229920000573 polyethylene Polymers 0.000 claims description 3
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 3
- 239000004800 polyvinyl chloride Substances 0.000 claims description 3
- 239000010902 straw Substances 0.000 claims description 3
- 239000002025 wood fiber Substances 0.000 claims description 3
- 239000002023 wood Substances 0.000 claims 1
- 238000012360 testing method Methods 0.000 abstract description 13
- 230000000694 effects Effects 0.000 abstract description 10
- 238000012545 processing Methods 0.000 abstract description 6
- 239000003153 chemical reaction reagent Substances 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 16
- 230000000052 comparative effect Effects 0.000 description 9
- 239000010453 quartz Substances 0.000 description 7
- 230000000903 blocking effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 239000007789 gas Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 239000007921 spray Substances 0.000 description 3
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- XQCFHQBGMWUEMY-ZPUQHVIOSA-N Nitrovin Chemical compound C=1C=C([N+]([O-])=O)OC=1\C=C\C(=NNC(=N)N)\C=C\C1=CC=C([N+]([O-])=O)O1 XQCFHQBGMWUEMY-ZPUQHVIOSA-N 0.000 description 2
- 238000013459 approach Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 229910052681 coesite Inorganic materials 0.000 description 2
- 229910052906 cristobalite Inorganic materials 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000007062 hydrolysis Effects 0.000 description 2
- 238000006460 hydrolysis reaction Methods 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 229910052682 stishovite Inorganic materials 0.000 description 2
- 229910052905 tridymite Inorganic materials 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- 241001074085 Scophthalmus aquosus Species 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 239000002981 blocking agent Substances 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000005713 exacerbation Effects 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000011085 pressure filtration Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229910052604 silicate mineral Inorganic materials 0.000 description 1
- 239000002210 silicon-based material Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910001868 water Inorganic materials 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
- E21B47/00—Survey of boreholes or wells
- E21B47/10—Locating fluid leaks, intrusions or movements
-
- 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
- C09K8/02—Well-drilling compositions
- C09K8/03—Specific additives for general use in well-drilling 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
- C09K8/02—Well-drilling compositions
- C09K8/03—Specific additives for general use in well-drilling compositions
- C09K8/035—Organic additives
-
- 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
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/04—Hulls, shells or bark containing well drilling or treatment fluids
-
- 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
- C09K2208/08—Fiber-containing well treatment fluids
-
- 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
- C09K2208/18—Bridging agents, i.e. particles for temporarily filling the pores of a formation; Graded salts
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Geophysics (AREA)
- Sealing Material Composition (AREA)
Abstract
The present invention relates to oil/gas well reagent field, discloses a kind of method for expanding narrow ' Safe Density Windows, wherein, this method comprises the following steps：(1) injected after drilling fluid is aggravated in shale formation and survey its leakage situation；(2) mixture of step (1) is mixed, stirred and surveyed its leakage situation with bridging materials；(3) mixture of step (2) is mixed, stirred and surveyed its leakage situation with quartz sand；(4) mixture of step (3) is mixed, stirred and surveyed its leakage situation with swollen material；(5) mixture of step (4) is mixed with packing material, stirred.This method can simplify live complex operations, and effect fast understands, while substep real-time testing leakage situation, specific processing in light of the circumstances, realize the controllableization operation that pressure-bearing closure expands narrow ' Safe Density Windows.
Description
Technical field
The present invention relates to oil/gas well reagent field, and in particular to a kind of method for expanding narrow ' Safe Density Windows.
Background technology
The drilling liquid technology of narrow mud ' Safe Density Windows (including window width is zero or is negative) safety drilling is to ensure
High pressure, high yield, high sour gas well prevent blowout out of control, the necessary technology of safety drilling.And current drilling engineering circle both at home and abroad
Common concern, be badly in need of solving and failing the significant technology issues being fully solved.It is one
System engineering, this special topic pertain only to ensure safe drilling liquid technology in itself.It is narrow mud ' Safe Density Windows safety drilling skill
The important foundation of art and necessary component part, particularly project propose to expand the theory of ' Safe Density Windows and it is corresponding in fact
Existing technology is even more to provide important technical support to solving this significant technology issues for seriously affecting drilling safety.
According to the research to it and field engineering practice analysis, such issues that can be divided into three kinds of situations：
Δ P 1. (narrow) ＞ 0, and numerical value is smaller (narrow)：At this time, the approach of solution is to try to reduce the annular space pressure of mud circulation
Drop, is less than Δ P (narrow)；This is to reduce the series matching technology that mud Cyclic Rings pneumatics is reduced to core, is in recent years
The series technique tackled problems and be attended by the most momentous results always；That is Δ P (narrow) ＞ 0 and Mud Technology can make Δ P (mud follows) ＜
Δ P (narrow).
Δ P 2. (narrow) ＞ 0, but it is too small, so that being always less than Δ P (mud follows) (i.e. since Δ P (mud follows) cannot be unlimited
Make small, then Δ P (mud follows) ＞ Δs P (narrow) ＞ 0 occur).
This is the significant technology issues currently run into, it is most common when boring chance high pressure, high yield, low pressure-bearing gas-bearing formation.Into
For the advanced subject of the existing tackling key problem of emphasis both at home and abroad.It has formed clear and definite technology path：I.e. " to drop low delta p (mud to greatest extent
Follow) based on controlled pressure drilling technology ".At present, all also great tackling key problem is being organized both at home and abroad.
The problem of Δ P 3. (narrow) ＜ 0, i.e. negative ' Safe Density Windows：
This is the produced problem when brill chance " spray, leak same layer ", " spray, leak same deposit " and leakage pressure are less than strata pressure.
This problem is met when boring, drilling engineering can not be successfully progress, often：Want well not leak, blowout will necessarily be caused,
And can not kill-job control if blowout；Otherwise spray will necessarily then leak, a leakage will necessarily induce blowout again, can not if blowout
Kill-job controls, so that great engineering accident is caused, and when payzone will likely cause great public safety accident for oil, gas.
Particularly when payzone is three HI ALT High Altitude, by the great dangerous matter sources as critical public safety.
The reliable approach for solving the problems, such as this is effectively blocking and make the leakage pressure of its drop ply bring up to greatly to drop ply
In strata pressure, even if its ' Safe Density Windows is just, and it is more than the well mud annular circulation pressure drop.
The situation of leakage is sufficiently complex, and existing technical merit can be blocked for most of leakages, and most difficult is tight
Weight situation may also pass through plugging operations repeatedly, finally always can effectively block it, but for large fracture severe mud losses extremely
The present has no effective method.
Moreover, under negative ' Safe Density Windows by leak stopping come expand ' Safe Density Windows on the occasion of and be more than Δ P (mud follows),
Leak stopping with ordinary circumstance is very different the requirement with higher.It is required in the process that well control pushes down gas-bearing formation or kill-job is speedily carried out rescue work
In fast and effectively block drop ply, otherwise security incident and engineering accident can not avoid.
Do not reach a standard completely the situation substantially unqualified with the leakage stopping technology of fractured reservoir severe mud losses in leakage stopping technology
Under, it can effectively solve the problems, such as that this is current maximum technological difficulties and bores one of risk of three HI ALT High Altitudes maximum.
The content of the invention
The purpose of the invention is to overcome the above problem existing in the prior art, there is provided one kind expands narrow Safe Density window
The method of mouth, this method can simplify live complex operations, and effect fast understands, while substep real-time testing leakage situation,
Specific processing in light of the circumstances, realizes the controllableization operation that pressure-bearing closure expands narrow ' Safe Density Windows.
To achieve these goals, the present invention provides a kind of method for expanding narrow ' Safe Density Windows, wherein, this method
Comprise the following steps：
(1) injected after drilling fluid is aggravated in shale formation and survey its leakage situation；
(2) mixture of 20-100mL steps (1) is invaded in 28-32min, in the condition that depth of invasion is 0.5-1cm
Under, the mixture of step (1) is mixed, stirred and surveyed its leakage situation with bridging materials；
(3) mixture of 20-100mL steps (2) is invaded in 28-32min, in the condition that depth of invasion is 0.5-1cm
Under, the mixture of step (2) is mixed, stirred and surveyed its leakage situation with quartz sand；
(4) mixture of 20-100mL steps (3) is invaded in 28-32min, in the condition that depth of invasion is 0.5-1cm
Under, the mixture of step (3) is mixed, stirred and surveyed its leakage situation with swollen material；
(5) mixture of 20-100mL steps (4) is invaded in 28-32min, in the condition that depth of invasion is 0.5-1cm
Under, the mixture of step (4) is mixed with packing material, is stirred.
Preferably, on the basis of the drilling fluid of 100 parts by weight, the dosage of the bridging materials is 0.5-5 parts by weight,
The dosage of the quartz sand is 4-19 parts by weight, and the dosage of the swellable material is 1-7 parts by weight, the use of the packing material
Measure as 0.5-5 parts by weight.
Preferably, on the basis of the drilling fluid of 100 parts by weight, the dosages of the bridging materials is 1-4 parts by weight, institute
The dosage for stating quartz sand is 8-16 parts by weight, and the dosage of the swellable material is 2-6 parts by weight, the dosage of the packing material
For 1-4 parts by weight；
Preferably, on the basis of the drilling fluid of 100 parts by weight, the dosage of the bridging materials is 1.5-3 parts by weight,
The dosage of the quartz sand is 10-12 parts by weight, and the dosage of the swellable material is 3-4 parts by weight, the packing material
Dosage is 1.5-3 parts by weight.
Preferably, the bridging materials are the one or more in Paris white A, Paris white B and rigid sealing agent；
Preferably, the bridging materials are Paris white A, Paris white B and the mixture of rigid sealing agent, and the carbon
The weight ratio of the dosage of sour calcium powder A, Paris white B and rigid sealing agent is (0.5-0.7)：(0.1-0.3)：1；
It is highly preferred that the particle diameter of the Paris white A is 0.300-0.450mm；The particle diameter of the calcium carbonate B is 0.150-
0.200mm。
Preferably, the rigid sealing agent is walnut shell and the mixture of shell, and the dosage of the walnut shell and shell
Weight ratio be 1：(0.4-0.6)；
Preferably, the particle diameter of the rigid sealing agent is 0.5-1mm.
Preferably, the quartz sand is silica dioxide granule；
Preferably, the quartz sand particle size is 0.425-0.850mm.
Preferably, the swellable material is the one or more in nanmu silver powder, cotton peach and resin, and the resin is
Polyethylene and/or polyvinyl chloride；
Preferably, the particle diameter of the nanmu silver powder is 0.15-0.26mm, and the particle diameter of the cotton peach is 0.2-0.29mm,
The grain diameter of the resin is 0.09-0.15mm.
Preferably, the packing material is composite material of plant fiber；
Preferably, the composite material of plant fiber is wood fiber and/or wheat straw fiber；
It is highly preferred that the particle diameter of the packing material is 0.02-0.3mm.
Preferably, this method further includes the mixture of step (5) and macromolecular inhibitor mixed, stirring and surveys its leakage
Situation；
Preferably, the macromolecular inhibitor is potassium ammonium hydrolyzed polyacrylonitrile and/or sulfonation nitro khm；
It is further preferred that the macromolecular inhibitor is potassium ammonium hydrolyzed polyacrylonitrile and sulfonation nitro khm
Mixture, and the weight ratio of the dosage of the potassium ammonium hydrolyzed polyacrylonitrile and the sulfonation nitro khm is (0.38-
0.61)：1；
It is highly preferred that on the basis of the drilling fluid of 100 parts by weight, the dosage of the macromolecular inhibitor is 2-6 weights
Measure part；
It is further preferred that the dosage of the macromolecular inhibitor is 3-5 parts by weight.
Preferably, the stirring condition includes：Stir speed (S.S.) is 7000-10000 revs/min, is preferably 8000-9000
Rev/min.
Through the above technical solutions, the beneficial effects of the present invention are：This method can simplify live complex operations, effect
Fruit fast understands, while substep real-time testing leakage situation, and specific processing in light of the circumstances, realizes pressure-bearing closure and expand
The controllableization operation of narrow ' Safe Density Windows.
Brief description of the drawings
Fig. 1 is the flow diagram of the method for the narrow ' Safe Density Windows of expansion of the present invention；
Fig. 2 is the schematic diagram of the device of the leakage method of present invention test drilling fluid.
Embodiment
The endpoint of disclosed scope and any value are not limited to the accurate scope or value herein, these scopes or
Value should be understood to comprising the value close to these scopes or value.For number range, between the endpoint value of each scope, respectively
It can be combined with each other between the endpoint value of a scope and single point value, and individually between point value and obtain one or more
New number range, these number ranges should be considered as specific open herein.
The present invention provides a kind of method for expanding narrow ' Safe Density Windows, wherein, this method comprises the following steps：
(1) injected after drilling fluid is aggravated in shale formation and survey its leakage situation；
(2) mixture of 20-100mL steps (1) is invaded in 28-32min, in the condition that depth of invasion is 0.5-1cm
Under, the mixture of step (1) is mixed, stirred and surveyed its leakage situation with bridging materials；
(3) mixture of 20-100mL steps (2) is invaded in 28-32min, in the condition that depth of invasion is 0.5-1cm
Under, the mixture of step (2) is mixed, stirred and surveyed its leakage situation with quartz sand；
(4) mixture of 20-100mL steps (3) is invaded in 28-32min, in the condition that depth of invasion is 0.5-1cm
Under, the mixture of step (3) is mixed, stirred and surveyed its leakage situation with swollen material；
(5) mixture of 20-100mL steps (4) is invaded in 28-32min, in the condition that depth of invasion is 0.5-1cm
Under, the mixture of step (4) is mixed with packing material, is stirred.
The method according to the invention, on the basis of the drilling fluid of 100 parts by weight, the dosages of the bridging materials can be with
For 0.5-5 parts by weight, the dosage of the quartz sand can be 4-19 parts by weight, and the dosage of the swellable material can be 1-7
Parts by weight, the dosage of the packing material can be 0.5-5 parts by weight.In the present invention, this method can be according to live complicated
Situation, according to the leakage situation of test, as long as bridging materials, quartz sand, swellable material and packing material meet above-mentioned ratio
Example relation can achieve the object of the present invention to a certain extent.
The present inventor has found under study for action, although as long as bridging materials, quartz sand, swellable material and filling material
Material, which meets aforementioned proportion relation, to be achieved the object of the present invention to a certain extent, but under preferable case, with 100 parts by weight
On the basis of the drilling fluid, the dosage of the bridging materials is 1-4 parts by weight, and the dosage of the quartz sand is 8-16 parts by weight,
The dosage of the swellable material is 2-6 parts by weight, and when the dosage of the packing material is 1-4 parts by weight, effect is more preferable；With
On the basis of the drilling fluid of 100 parts by weight, the dosages of the bridging materials is 1.5-3 parts by weight, the dosage of the quartz sand
For 10-12 parts by weight, the dosage of the swellable material is 3-4 parts by weight, and the dosage of the packing material is 1.5-3 parts by weight
When, effect is more preferable.
The method according to the invention, in step (1), the drilling fluid is not particularly limited, for example, can be arbitrarily to take
The drilling fluid for shale formation from scene, the component of the drilling fluid can include bentonite, water, calcium carbonate, extracting and cutting agent, drop
One or more in fluid loss agents, inhibitor, lubricant and heavy weight additive.
The method according to the invention, in step (1), the method that drilling fluid aggravates is not particularly limited, for example, can be with
Quantitative drilling fluid is added to required proportion, referred to as quantitatively drilling fluid aggravates, wherein, by needed for the exacerbation of quantitative drilling fluid
The quality W of weighting material can be obtained according to following formula：
W=V slurry * ρ3*(ρ2-ρ1)/(ρ3-ρ2)；
V slurries-magma volume,
ρ1- magma density；
ρ2(it is ρ that drilling fluid is weighed out to density to-drilling fluid density to be matched somebody with somebody2)；
ρ3- weighting material density.
Wherein, weighting material is not particularly limited, as long as the density of the weighting material meets above-mentioned requirements.
In addition, in the present invention, it is ρ that drilling fluid is weighed out to density2, that is to say, that drilling fluid density ρ to be matched somebody with somebody2Can be
1.6-2.2g/cm3, it is preferably 1.8-2.0g/cm3。
The method according to the invention, the bridging materials can be in Paris white A, Paris white B and rigid sealing agent
One or more；
Preferably, the bridging materials are Paris white A, Paris white B and the mixture of rigid sealing agent, and the carbon
The weight ratio of the dosage of sour calcium powder A, Paris white B and rigid sealing agent can be (0.5-0.7)：(0.1-0.3)：1；More preferably
The weight ratio of the dosage of ground, the Paris white A, Paris white B and rigid sealing agent is (0.55-0.65)：(0.15-
0.25)：1.
In the method for the invention, the particle diameter of the Paris white A can be 0.300-0.450mm；The calcium carbonate B's
Particle diameter can be 0.150-0.200mm；Preferably, the particle diameter of the Paris white A is 0.34-0.4mm；The calcium carbonate B's
Particle diameter is 0.16-0.18mm.
In the method for the invention, the rigid sealing agent can be the mixture of walnut shell and shell, and the walnut
The weight ratio of the dosage of shell and shell can be 1：(0.4-0.6)；Preferably, the weight ratio of the dosage of the walnut shell and shell
For 1：(0.45-0.55).
In the method for the invention, the particle diameter of the rigid sealing agent can be 0.5-1mm, it is preferable that the rigidity envelope
The particle diameter of blocking agent can be 0.6-0.8mm.
In the method for the invention, the component of the bridging structure, that is, Paris white A, Paris white B and rigid sealing agent,
Dosage and particle diameter are defined to above range, can form the small hole of net structure, have efficient, quick blocking performance, and
And the controllableization operation that pressure-bearing closure expands narrow ' Safe Density Windows can be realized.
The method according to the invention, the quartz sand can be silica dioxide granule；Preferably, the quartz sand particle size can
Think 0.425-0.850mm；It is highly preferred that the quartz sand particle size is 0.5-0.7mm.
In the method for the invention, quartz sand is the broken quartz particles being process of quartz warp, and quartz sand is a kind of
Hard, wear-resisting, stable chemical performance silicate mineral, its main mineral constituent are SiO2, the color of quartz sand is milky
Or semi-transparent clear shape, hardness 7 are acidproof mixed for producing under construction using the very strong acid-resisting medium etch ability of quartz
Solidifying soil and acid resisting mortar, have preferable plugging effect, are good plugging materials.
In the method for the invention, the particle diameter of the quartz sand is defined to above range, can fill in bridging structure
Small hole, forms one layer of fine and close leak stopping thin layer, has efficient, quick blocking performance, and can realize pressure-bearing closure
Expand the controllableization operation of narrow ' Safe Density Windows.
The method according to the invention, the swellable material can be nanmu silver powder, cotton peach and one kind in resin or
A variety of, the resin can be polyethylene and/or polyvinyl chloride；Preferably, the particle diameter of the nanmu silver powder can be 0.15-
0.26mm, the particle diameter of the cotton peach can be 0.2-0.29mm, and the grain diameter of the resin can be 0.09-0.15mm.
In the method for the invention, the component of the swollen material and particle diameter are defined to above range, can be preferably molten
It is swollen, and then the small hole that bridging structure is formed with quartz sand can be filled, there is efficient, quick blocking performance, and can
Realize the controllableization operation that pressure-bearing closure expands narrow ' Safe Density Windows.
The method according to the invention, the packing material can be composite material of plant fiber；Preferably, the plant is fine
It can be wood fiber and/or wheat straw fiber to tie up composite material；It is highly preferred that the particle diameter of the packing material can be 0.02-
0.3mm。
In the method for the invention, the component of the packing material and particle diameter are defined to above range, can further capture
Bridge formation particle, quartz sand and the swellable material obtained in suspension forms rock-steady structure, is then mutually wound in leakage channel
Netted bridging structure is formed, and certain pressure can be born, there is efficient, quick blocking performance, and can realize and hold
Press seal blocks up the controllableization operation for expanding narrow ' Safe Density Windows.
The method according to the invention, this method are further included the mixture of step (5) and macromolecular inhibitor mixed, stirring
And survey its leakage situation；
Preferably, the macromolecular inhibitor is potassium ammonium hydrolyzed polyacrylonitrile and/or sulfonation nitro khm；
It is further preferred that the macromolecular inhibitor is potassium ammonium hydrolyzed polyacrylonitrile and sulfonation nitro khm
Mixture, and the weight ratio of the dosage of the potassium ammonium hydrolyzed polyacrylonitrile and the sulfonation nitro khm can be
(0.38-0.61)：1；
It is highly preferred that on the basis of the drilling fluid of 100 parts by weight, the dosage of the macromolecular inhibitor can be 2-
6 parts by weight；
It is further preferred that the dosage of the macromolecular inhibitor is 3-5 parts by weight.
In the method for the invention, the macromolecular inhibitor can effectively prevent formation rock aquation from causing crack into one
The characteristics of step development, there is more excellent plugging effect, and pressure-bearing closure can be realized and expand narrow ' Safe Density Windows
Controllableization operation.
The method according to the invention, the stirring condition can include：Stir speed (S.S.) can be 7000-10000 revs/min
Clock, is preferably 8000-9000 revs/min；Wherein, the equipment of stirring is not particularly limited, and can be the conventional selection of this area.
The method according to the invention, with reference to the schematic diagram of the device of the leakage method of such as Fig. 2 present invention test drilling fluids, is surveyed
The leakage method of test drilling well liquid is：Site operation situation is simulated, the shale for being derived from situ of drilling well stratum is polished into a diameter of 66
Mm length is 10 millimeters of cylinder, is then embedded within a diameter of 66 millimeters of conventional high temperature high pressure filtration device autoclave body
Portion, from autoclave body top pours into 100ml drilling fluids, screwing upper cover makes whole autoclave body be in sealing state, from upper kettle after sealing lower cover
3.5MPa pressure nitrogen gas is passed through at body air valve and continues 30 minutes, observes and records filtrate port leakage situation and intrusion shale drilling well
The volume of liquid, then upper cover is opened after pressure release and sequentially adds bridging materials, quartz, swollen material, packing material, often add a kind of component
When be sufficiently stirred after repeat aforesaid operations step, observe and record the leakage situation of each step and the body of intrusion shale drilling fluid
Product.
The beneficial effects of the present invention are：This method can simplify live complex operations, and effect fast understands, the same to time-division
Real-time testing leakage situation is walked, in light of the circumstances specific processing, realize pressure-bearing closure and expand narrow ' Safe Density Windows
Controllableization operates.
The present invention will be described in detail by way of examples below.
Drilling fluid is the drilling fluid for shale formation for being arbitrarily derived from scene.
Quartz sand is purchased from Jiangsu Zhong Sheng silicon materials Science and Technology Ltd., main component SiO2。
Fibrous material is purchased from Shandong gold Nore building materials Science and Technology Ltd., model PPF.
Potassium ammonium hydrolyzed polyacrylonitrile and sulfonation nitro khm are purchased from Renqiu City Peng Yu Chemical Co., Ltd.s, model
KNPAN and SNK-2.
Calcium carbonate A and calcium carbonate B is purchased from Guizhou millimicro powder industry Co., Ltd, main component CaCO3。
Embodiment 1
The present embodiment indicates that method using the present invention expands narrow ' Safe Density Windows, and with reference to the present invention of figure 1
The flow diagrams of method of the narrow ' Safe Density Windows of expansion carry out：
(1) drilling fluid is weighed out to ρ2For 1.9g/cm3, observe and record its leakage situation；
(2) mixture of 80mL (1) is invaded in 30min, depth of invasion 0.8cm, is 8500 revs/min in stir speed (S.S.)
Under conditions of clock, the calcium carbonate B for being 0.18mm by calcium carbonate A that 0.7 parts by weight particle diameter is 0.4mm, 0.3 parts by weight particle diameter, 1 weight
The rigid sealing agent that amount part particle diameter is 0.7mm is added in the mixture of step (1), observes and records its leakage situation；
(3) mixture of 60mL (2) is invaded in 30min, depth of invasion 0.7cm, is 8500 revs/min in stir speed (S.S.)
Under conditions of clock, the quartz sand that 11 parts by weight particle diameters are 0.6mm is added in the mixture of step (2), observes and records it
Leakage situation；
(4) mixture of 40mL (3) is invaded in 30min, depth of invasion 0.6cm, is 8500 revs/min in stir speed (S.S.)
Under conditions of clock, the cotton peach and 1.3 for being 0.25mm by nanmu silver powder that 1.2 parts by weight particle diameters are 0.2mm, 1 parts by weight particle diameter
Parts by weight particle diameter is that the Corvic of 0.12mm is added in the mixture of step (3), observes and records its leakage situation；
(5) mixture of 30mL (4) is invaded in 30min, depth of invasion 0.6cm, is 8500 revs/min in stir speed (S.S.)
Under conditions of clock, the composite material of plant fiber that 3 parts by weight particle diameters are 0.13mm is added in the mixture of step (4).
As a result the leakage situation measured is as shown in table 1, labeled as S1.
Embodiment 2
Expand narrow ' Safe Density Windows in the same manner as shown in Example 1, the difference is that being 8500 in stir speed (S.S.)
Under conditions of rev/min, 2 parts by weight potassium ammonium hydrolyzed polyacrylonitriles and 4 parts by weight sulfonation nitro khms are added to step
Suddenly in the mixture of (5).
As a result the leakage situation measured is as shown in table 1, labeled as S2.
Embodiment 3
Expand narrow ' Safe Density Windows according to method same as Example 2, the difference is that Paris white A, calcium carbonate
Powder B, rigid sealing agent, quartz sand, packing material, nanmu silver powder, cotton peach are different with the particle diameter of resin, specifically：
The particle diameter of Paris white A is 0.3mm, and the particle diameter of Paris white B is 0.15mm, and the particle diameter of rigid sealing agent is
0.52mm, the particle diameter of quartz sand are 0.43mm, and the particle diameter of packing material is 0.02mm, and the particle diameter of nanmu silver powder is 0.15mm, cotton
The particle diameter of Hua Tao is 0.2mm and the particle diameter of the particle diameter of resin is 0.09mm.
As a result the leakage situation measured is as shown in table 1, labeled as S3.
Embodiment 4
Expand narrow ' Safe Density Windows according to method same as Example 2, the difference is that Paris white A, calcium carbonate
Powder B is different with the weight ratio of the dosage of rigid sealing agent, specifically：
The weight ratio of the dosage of Paris white A, Paris white B and rigid sealing agent is 0.5：0.1：1.
As a result the leakage situation measured is as shown in table 1, labeled as S4.
Embodiment 5
Expand narrow ' Safe Density Windows according to method same as Example 2, the difference is that potassium ammonium hydrolysis is poly-
Acrylonitrile is different with the dosage of the sulfonation nitro khm, specifically：
The weight ratio of the dosage of the potassium ammonium hydrolyzed polyacrylonitrile and the sulfonation nitro khm is 0.4：1.
As a result the leakage situation measured is as shown in table 1, labeled as S5.
Embodiment 6
The present embodiment indicates that method using the present invention expands narrow ' Safe Density Windows, and with reference to the present invention of figure 1
The flow diagrams of method of the narrow ' Safe Density Windows of expansion carry out：
(1) drilling fluid is weighed out to ρ2For 1.9g/cm3, observe and record its leakage situation；
(2) mixture of 90mL (1) is invaded in 30min, depth of invasion 0.9cm, is 8500 revs/min in stir speed (S.S.)
Under conditions of clock, the calcium carbonate B for being 0.18mm by calcium carbonate A that 0.7 parts by weight particle diameter is 0.4mm, 0.3 parts by weight particle diameter, 1 weight
The rigid sealing agent that amount part particle diameter is 0.7mm is added in the mixture of step (1), observes and records its leakage situation；
(3) mixture of 70mL (2) is invaded in 30min, depth of invasion 0.8cm, is 8500 revs/min in stir speed (S.S.)
Under conditions of clock, the quartz sand that 11 parts by weight particle diameters are 0.6mm is added in the mixture of step (2), observes and records it
Leakage situation；
(4) mixture of 50mL steps (3) is invaded in 30min, depth of invasion 0.7cm, is 8500 in stir speed (S.S.)
Under conditions of rev/min, the cotton peach for being 0.25mm by nanmu silver powder that 1.2 parts by weight particle diameters are 0.2mm, 1 parts by weight particle diameter
It is added to 1.3 parts by weight particle diameters for the Corvic of 0.12mm in the mixture of step (3), observes and record its leakage
Situation；
(5) mixture of 35mL steps (4) is invaded in 30min, depth of invasion 0.65cm, is 8500 in stir speed (S.S.)
Under conditions of rev/min, the composite material of plant fiber that 3 parts by weight particle diameters are 0.13mm is added to the mixture of step (4)
In, observe and record its leakage situation；
(6) mixture of 30mL steps (5) is invaded in 30min, depth of invasion 0.6cm, is 8500 in stir speed (S.S.)
Under conditions of rev/min, 2 parts by weight potassium ammonium hydrolyzed polyacrylonitriles and 4 parts by weight sulfonation nitro khms are added to step
Suddenly in the mixture of (5).
As a result the leakage situation measured is as shown in table 1, labeled as S6.
Comparative example 1
Expand narrow ' Safe Density Windows according to method same as Example 2, the difference is that packing material dosage subtracts
It is few, i.e. 0.5 parts by weight composite material of plant fiber.
As a result the leakage situation measured is as shown in table 1, labeled as D1.
Comparative example 2
Expand narrow ' Safe Density Windows according to method same as Example 2, the difference is that bridging materials dosage subtracts
It is few, i.e. 0.3 weight parts of calcium carbonate B, 0.5 parts by weight rigidity sealing agent.
As a result the leakage situation measured is as shown in table 1, labeled as D2.
Comparative example 3
Expand narrow ' Safe Density Windows according to method same as Example 2, the difference is that swollen material dosage subtracts
It is few, i.e. 1 parts by weight swellable material.
As a result the leakage situation measured is as shown in table 1, labeled as D3.
Comparative example 4
Expand narrow ' Safe Density Windows according to method same as Example 2, the difference is that Paris white A, calcium carbonate
Powder B, rigid sealing agent, quartz sand, packing material, nanmu silver powder, the particle diameter of cotton peach and resin are not limited of the invention
Within the scope of, specifically：
The particle diameter of Paris white A is 0.65mm, and the particle diameter of Paris white B is 0.3mm, and the particle diameter of rigid sealing agent is
1.2mm, the particle diameter of quartz sand are 0.8mm, and the particle diameter of packing material is 0.5mm, and the particle diameter of nanmu silver powder is 0.3mm, cotton peach
Particle diameter be 0.35mm and the particle diameter of resin is 0.25mm.
As a result the leakage situation measured is as shown in table 1, labeled as D4.
Comparative example 5
Expand narrow ' Safe Density Windows according to method same as Example 2, the difference is that Paris white A, calcium carbonate
The weight ratio of the dosage of powder B and rigid sealing agent is not within limited range of the present invention, specifically：
The weight ratio of the dosage of Paris white A, Paris white B and rigid sealing agent is 0.1：0.8：1.
As a result the leakage situation measured is as shown in table 1, labeled as D5.
Comparative example 6
Expand narrow ' Safe Density Windows according to method same as Example 2, the difference is that potassium ammonium hydrolysis is poly-
The dosage of acrylonitrile and the sulfonation nitro khm is not within limited range of the present invention, specifically：
The weight ratio of the dosage of the potassium ammonium hydrolyzed polyacrylonitrile and the sulfonation nitro khm is 0.1：1.
As a result the leakage situation measured is as shown in table 1, labeled as D6.
Table 1
It can be seen that by above-described embodiment, comparative example and 1 data of table using the method for the present invention, directly by situ of drilling well
Cylinder is made as experiment condition in the shale on stratum, more close to field condition, live complex operations is simplified, effect is quick
Understand, at the same substep real-time testing leakage situation, specific processing in light of the circumstances, specifically, such as 1 data of table, present invention side
Test is divided into drilling fluid, addition bridging materials, adds quartz, addition swollen material, addition packing material, addition macromolecular by method
Six stage of inhibitor carries out；Data horizontal analysis can be achieveed the purpose that into substep real-time testing, specifically fixed depending on leakage situation
Component particle diameter and dosage needed for one step, specifically, embodiment 2 and embodiment 1 it is different be only macromolecular inhibitor addition,
As can be seen from the data, the drilling fluid experiment slurry intrusion page after bridging materials, quartz, swollen material and packing material is sequentially added
Rock depth is only 1.5 millimeters, and intrusion volume is only 7 milliliters, its performance is very excellent, its property after macromolecular inhibitor is added
Can further be optimized, according to the present invention method, choose whether to add macromolecular inhibitor can according to site operation cost and
From the aspect of specific requirement performance indicator two, embodiment 1-6 for each component particle diameter or dosage limited range of the present invention it
Interior change, comparative example 1-6 changes each component particle diameter or dosage and not within limited range of the present invention, according to this hair
Bright method tests the data obtained, and the property of drilling fluid of comparative example 1-6 cannot reach pressure-bearing closure and require, be obtained most through successive optimization
Excellent scheme is embodiment 2；Data horizontal analysis can be made to the specific place of next step according to specific steps institute produced problem
Reason scheme, realizes the controllableization operation that pressure-bearing closure expands narrow ' Safe Density Windows, data vertical analysis can be contrasted
Optimized particle size, ratio and the dosage of component (bridging materials, quartz, swollen material, packing material, macromolecular inhibitor), make
The shut-off capacity for obtaining drilling fluid is optimal, and thus illustrates the method for the present invention, can simplify live complex operations, effect is quick
Understand, while substep real-time testing leakage situation, specific processing in light of the circumstances, realizes pressure-bearing closure and expands narrow safety
The controllableization operation of Density Window.
The preferred embodiment of the present invention described in detail above, still, the present invention is not limited thereto.In the skill of the present invention
In art concept, technical scheme can be carried out a variety of simple variants, including each technical characteristic with it is any its
Its suitable method is combined, these simple variants and combination should equally be considered as content disclosed in this invention, belong to
Protection scope of the present invention.
Claims (10)
- A kind of 1. method for expanding narrow ' Safe Density Windows, it is characterised in that this method comprises the following steps：(1) injected after drilling fluid is aggravated in shale formation and survey its leakage situation；(2) mixture of 20-100mL steps (1) is invaded in 28-32min, will under conditions of depth of invasion is 0.5-1cm The mixture of step (1) is mixed with bridging materials, stirred and surveys its leakage situation；(3) mixture of 20-100mL steps (2) is invaded in 28-32min, will under conditions of depth of invasion is 0.5-1cm The mixture of step (2) is mixed with quartz sand, stirred and surveys its leakage situation；(4) mixture of 20-100mL steps (3) is invaded in 28-32min, will under conditions of depth of invasion is 0.5-1cm The mixture of step (3) is mixed with swollen material, stirred and surveys its leakage situation；(5) mixture of 20-100mL steps (4) is invaded in 28-32min, will under conditions of depth of invasion is 0.5-1cm The mixture of step (4) is mixed with packing material, stirred.
- 2. according to the method described in claim 1, wherein, on the basis of the drilling fluid of 100 parts by weight, the bridging materials Dosage be 0.5-5 parts by weight, the dosage of the quartz sand is 4-19 parts by weight, and the dosage of the swellable material is 1-7 weights Part is measured, the dosage of the packing material is 0.5-5 parts by weight.
- 3. according to the method described in claim 2, wherein, on the basis of the drilling fluid of 100 parts by weight, the bridging materials Dosage be 1-4 parts by weight, the dosage of the quartz sand is 8-16 parts by weight, and the dosage of the swellable material is 2-6 weight Part, the dosage of the packing material is 1-4 parts by weight；Preferably, on the basis of the drilling fluid of 100 parts by weight, the dosage of the bridging materials is 1.5-3 parts by weight, described The dosage of quartz sand is 10-12 parts by weight, and the dosage of the swellable material is 3-4 parts by weight, the dosage of the packing material For 1.5-3 parts by weight.
- 4. according to the method described in any one in claim 1-3, wherein, the bridging materials are Paris white A, calcium carbonate One or more in powder B and rigid sealing agent；Preferably, the bridging materials are Paris white A, Paris white B and the mixture of rigid sealing agent, and the calcium carbonate The weight ratio of the dosage of powder A, Paris white B and rigid sealing agent is (0.5-0.7)：(0.1-0.3)：1；It is highly preferred that the particle diameter of the Paris white A is 0.300-0.450mm；The particle diameter of the calcium carbonate B is 0.150- 0.200mm。
- 5. according to the method described in claim 4, wherein, the rigidity sealing agent is walnut shell and the mixture of shell, and institute The weight ratio for stating the dosage of walnut shell and shell is 1：(0.4-0.6)；Preferably, the particle diameter of the rigid sealing agent is 0.5-1mm.
- 6. according to the method described in any one in claim 1-3, wherein, the quartz sand is silica dioxide granule；Preferably, the quartz sand particle size is 0.425-0.850mm.
- 7. according to the method described in any one in claim 1-3, wherein, the swellable material is nanmu silver powder, cotton One or more in peach and resin, the resin are polyethylene and/or polyvinyl chloride；Preferably, the particle diameter of the nanmu silver powder is 0.15-0.26mm, and the particle diameter of the cotton peach is 0.20-0.29mm, described The grain diameter of resin is 0.09-0.15mm.
- 8. according to the method described in any one in claim 1-3, wherein, the packing material is plant fiber composite wood Material；Preferably, the composite material of plant fiber is wood fiber and/or wheat straw fiber；It is highly preferred that the particle diameter of the packing material is 0.02-0.3mm.
- 9. according to the method described in claim 1, wherein, this method, which further includes, suppresses the mixture of step (5) and macromolecular Agent mixing, stir and survey its leakage situation；Preferably, the macromolecular inhibitor is potassium ammonium hydrolyzed polyacrylonitrile and/or sulfonation nitro khm；It is further preferred that mixing of the macromolecular inhibitor for potassium ammonium hydrolyzed polyacrylonitrile and sulfonation nitro khm Thing, and the weight ratio of the dosage of the potassium ammonium hydrolyzed polyacrylonitrile and the sulfonation nitro khm is (0.38-0.61)： 1；It is highly preferred that on the basis of the drilling fluid of 100 parts by weight, the dosage of the macromolecular inhibitor is 2-6 parts by weight；It is further preferred that the dosage of the macromolecular inhibitor is 3-5 parts by weight.
- 10. the method according to claim 1 or 9, wherein, the stirring condition includes：Stir speed (S.S.) is 7000-10000 Rev/min, it is preferably 8000-9000 revs/min.
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| CN111073616A (en) * | 2019-12-18 | 2020-04-28 | 中国海洋石油集团有限公司 | Temporary plugging agent and application thereof |
| CN111814115A (en) * | 2020-07-09 | 2020-10-23 | 中国石油大学(华东) | Method for correcting reliability-containing safe drilling fluid density window of fractured lost formation |
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| CN115612465A (en) * | 2022-08-30 | 2023-01-17 | 新疆格瑞迪斯石油技术股份有限公司 | Self-degradation plugging agent for fractured reservoir |
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