CN110903812A - Pretreatment method before reinjection of oil-free or low-oil-content rock debris utilizing depleted well - Google Patents
Pretreatment method before reinjection of oil-free or low-oil-content rock debris utilizing depleted well Download PDFInfo
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- 239000011435 rock Substances 0.000 title claims abstract description 76
- 238000002203 pretreatment Methods 0.000 title claims abstract description 16
- 239000002002 slurry Substances 0.000 claims abstract description 104
- 238000002360 preparation method Methods 0.000 claims abstract description 49
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 35
- 238000000034 method Methods 0.000 claims abstract description 25
- 239000000843 powder Substances 0.000 claims abstract description 19
- 239000002245 particle Substances 0.000 claims abstract description 18
- 239000003112 inhibitor Substances 0.000 claims abstract description 12
- 239000000375 suspending agent Substances 0.000 claims abstract description 12
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 8
- 239000000706 filtrate Substances 0.000 claims abstract description 8
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 46
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 46
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims description 46
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims description 46
- 239000010426 asphalt Substances 0.000 claims description 15
- 238000005520 cutting process Methods 0.000 claims description 14
- 239000000725 suspension Substances 0.000 claims description 14
- 239000008186 active pharmaceutical agent Substances 0.000 claims description 13
- 238000003756 stirring Methods 0.000 claims description 12
- 239000000230 xanthan gum Substances 0.000 claims description 8
- 229920001285 xanthan gum Polymers 0.000 claims description 8
- 235000010493 xanthan gum Nutrition 0.000 claims description 8
- 229940082509 xanthan gum Drugs 0.000 claims description 8
- 150000005846 sugar alcohols Polymers 0.000 claims description 6
- 229920002472 Starch Polymers 0.000 claims description 5
- 125000002057 carboxymethyl group Chemical group [H]OC(=O)C([H])([H])[*] 0.000 claims description 5
- 239000008107 starch Substances 0.000 claims description 5
- 235000019698 starch Nutrition 0.000 claims description 5
- 229920002678 cellulose Polymers 0.000 claims description 3
- 239000001913 cellulose Substances 0.000 claims description 3
- 239000003672 gas field water Substances 0.000 claims description 3
- 229920002907 Guar gum Polymers 0.000 claims description 2
- 239000000654 additive Substances 0.000 claims description 2
- 230000000996 additive effect Effects 0.000 claims description 2
- 238000001914 filtration Methods 0.000 claims description 2
- 239000000665 guar gum Substances 0.000 claims description 2
- 235000010417 guar gum Nutrition 0.000 claims description 2
- 229960002154 guar gum Drugs 0.000 claims description 2
- 239000008399 tap water Substances 0.000 claims description 2
- 235000020679 tap water Nutrition 0.000 claims description 2
- 238000003860 storage Methods 0.000 abstract description 10
- 238000010276 construction Methods 0.000 abstract description 8
- 238000004062 sedimentation Methods 0.000 abstract description 6
- 230000008569 process Effects 0.000 abstract description 5
- 238000013461 design Methods 0.000 abstract description 2
- 230000002349 favourable effect Effects 0.000 abstract 1
- 238000000227 grinding Methods 0.000 description 11
- 238000002474 experimental method Methods 0.000 description 10
- 239000006185 dispersion Substances 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 238000005553 drilling Methods 0.000 description 3
- 230000036571 hydration Effects 0.000 description 3
- 238000006703 hydration reaction Methods 0.000 description 3
- 230000005764 inhibitory process Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 230000003487 anti-permeability effect Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 229920000447 polyanionic polymer Polymers 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
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- 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
- C09K8/04—Aqueous well-drilling compositions
- C09K8/06—Clay-free compositions
- C09K8/08—Clay-free compositions containing natural organic compounds, e.g. polysaccharides, or derivatives thereof
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- 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
- C09K8/04—Aqueous well-drilling compositions
- C09K8/06—Clay-free compositions
- C09K8/08—Clay-free compositions containing natural organic compounds, e.g. polysaccharides, or derivatives thereof
- C09K8/10—Cellulose or derivatives thereof
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- 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
- C09K8/04—Aqueous well-drilling compositions
- C09K8/06—Clay-free compositions
- C09K8/12—Clay-free compositions containing synthetic organic macromolecular compounds or their precursors
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- 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
- C09K8/04—Aqueous well-drilling compositions
- C09K8/26—Oil-in-water emulsions
- C09K8/28—Oil-in-water emulsions containing 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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/01—Arrangements for handling drilling fluids or cuttings outside the borehole, e.g. mud boxes
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Fluid Mechanics (AREA)
- Geochemistry & Mineralogy (AREA)
- Environmental & Geological Engineering (AREA)
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- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention discloses a pretreatment method before reinjection of oil-free or low-oil-content rock debris by using a depleted well, and solves the problems of poor stability, easy sedimentation, easy blockage of a reinjection channel and easy instability and even collapse of a storage space wall in the prior art. The invention relates to a pretreatment method before reinjection of oil-free or low-oil-content rock debris by using a depleted well, which is characterized in that the oil-containing rock debris is ground into fine powder with the particle size of less than or equal to 300 mu m, and then the fine powder is uniformly mixed with slurry preparation water, a suspending agent, a filtrate reducer and an anti-collapse inhibitor to prepare reinjection slurry. The invention has scientific design, simple operation, good stability of the reinjection slurry, difficult sedimentation and no blockage of the reinjection channel. The re-grouting can form a thin and tough mud cake in the re-grouting construction process, so that a layer of film is attached to the originally uneven re-grouting channel wall, and the re-grouting construction method is favorable for reducing the flow resistance of the re-grouting and reducing the re-grouting construction pressure.
Description
Technical Field
The invention belongs to the field of petroleum drilling waste treatment, and aims at a pretreatment method before reinjection of oil-free or low-oil-content rock debris by using a depleted well generated by conventional water-based drilling fluid drilling.
Background
At present, the conventional oil-free or low-oil rock debris disposal technology generally adopts solidification, drying and physical separation, and all the methods have certain limitations. The depleted well is used as a storage space of the oil-containing rock debris, the oil-containing rock debris is intensively transferred, stored, ground and crushed, and then is mixed with water or sewage to form reinjection slurry, and the reinjection slurry is injected into the well for storage, so that the problem of disposal of the oil-free or low-oil-containing rock debris can be effectively solved.
In the prior art, when rock debris is prepared into grouting slurry and injected into a well, the problems of poor stability, easy sedimentation and easy blockage of a grouting channel exist, and meanwhile, as the grouting slurry is a water dispersion system, if the inhibition and filtrate reduction performance are not good, a thick mud cake is easily formed on the wall of the grouting channel, so that the grouting channel is narrowed or even blocked, and the application of the method is greatly limited; in addition, after reinjection of the reinjection slurry into the stratum storage space, the reinjection slurry is soaked for a long time, so that the wall of the storage space is easy to be unstable or even collapse, and the service life of the reinjection well is greatly reduced. Therefore, the method for pretreating the non-oil-containing or low-oil-containing rock debris before reinjection by using the depleted well is provided, so that the reinjection slurry has proper viscosity, static shear force, good rheological property and permeability resistance to meet the reinjection construction requirement; the stability is good, the sedimentation is not easy, the anti-permeability performance is good, the reinjection channel is not blocked, and the stability of the wall of the reservoir space can be kept after the anti-seepage oil enters the reservoir space, so that the problem to be solved by the technical personnel in the field is urgently needed.
Disclosure of Invention
The technical problem solved by the invention is as follows: the method for pretreating the oil-free or low-oil-content rock debris before reinjection by using the depleted well solves the problems that reinjection slurry in the prior art is poor in stability, easy to settle, poor in permeability resistance, easy to block a reinjection channel and easy to cause instability and even collapse of a storage space wall.
The technical scheme adopted by the invention is as follows:
the invention relates to a pretreatment method before reinjection of oil-free or low-oil-content rock debris by using a depleted well, which is characterized in that the oil-containing rock debris is ground into fine powder with the particle size of less than or equal to 300 mu m, and then the fine powder is uniformly mixed with slurry preparation water, a suspending agent, a filtrate reducer and an anti-collapse inhibitor to prepare reinjection slurry.
The reinjection slurry treated by the method has good suspension stability, salt pollution resistance, temperature resistance and permeability resistance, and can meet the requirements of reinjection construction; meanwhile, the re-grouting of the invention has good clay shale hydration dispersion resistance and is beneficial to the stability of the well wall.
The invention is ground into fine powder with the grain diameter less than or equal to 300 mu m, thereby avoiding blocking a reinjection channel and being beneficial to the stability of the reinjection slurry.
As an embodiment of the invention, in the back grouting, the mass-volume ratio of each component to the grout blending water is as follows: 1 to 3 percent of suspending agent, 0.5 to 3 percent of filtrate reducer, 0.5 to 3 percent of anti-collapse inhibitor and 10 to 30 percent of oil-free or low-oil-content rock debris; when the volume is mL, the mass is g.
Specifically, the slurry preparation water is selected from one or more of tap water, river and lake water and gas field water.
In the invention, the gas field water is used as the slurry preparation water, so that the problems of recycling and harmless disposal of oil field wastewater (liquid) can be effectively solved.
The suspending agent is selected from one or more of xanthan gum, guar gum and high-viscosity carboxymethyl cellulose.
The suspending agent is added into the reinjection slurry, so that the reinjection slurry has proper viscosity, and the stability of the reinjection slurry can be improved.
The fluid loss additive is selected from any one or more of low-viscosity carboxymethyl cellulose CMC-LVT, carboxymethyl starch and polyanion cellulose PAC.
Since the reinjection slurry is an aqueous dispersion system, if the fluid loss is not controlled, a thick mud cake is easily formed on the walls of the reinjection channel in the reinjection process, so that the channel is narrowed and even blocked. According to the invention, the fluid loss reducer is added, so that the fluid loss can be effectively controlled, a thin and tough mud cake can be formed on the reinjection channel wall, and a layer of thin film is attached to the original uneven reinjection channel wall, so that the reinjection slurry flow resistance and the reinjection construction pressure are favorably reduced.
The anti-collapse inhibitor is selected from one or more of polyalcohol PEG and white asphalt.
According to the invention, the anti-collapse inhibitor is added into the reinjection slurry, so that the reinjection slurry can always keep the stability of the reinjection channel wall and does not collapse in the reinjection process; after the reinjection slurry enters the stratum storage space, the instability and even collapse of the wall of the storage space can not be caused after the reinjection slurry is soaked for a long time, the long-term effectiveness of the reinjection channel and the storage space is ensured, and the continuity of reinjection production is ensured.
Grinding the oil-containing rock debris into fine powder with the particle size of 150-180 mu m.
As an embodiment of the present invention, a specific preparation method of the slip-back slurry is as follows: adding slurry preparation water into a slurry preparation container, then sequentially adding a suspending agent, oil-free or low-oil rock debris, a filtrate reducer and an anti-collapse inhibitor according to a proportion, and fully stirring.
Specifically, the stirring time is 2-4 h.
Preferably, the performance indexes of the reinjection slurry prepared by the pretreatment method are as follows:
shear rate of 170s-1Then, the apparent viscosity of the grouting slurry is 70-160 mPa.s; shear rate of 1022s-1And the apparent viscosity of the reinjection slurry is 30-55 mPa.s.
Preferably, the funnel viscosity of the back grouting is 64-146 s/946 ml;
or/and the API filtration loss is less than or equal to 10 ml;
preferably, the suspension stability of the back grouting is: standing at 120 deg.C for 24 hr to settle at density difference of 0.05g/cm or less3(ii) a Standing at 120 deg.C for 48 hr to settle at density difference of 0.08g/cm or less3。
The low oil content rock debris in the invention has an oil content of less than 5 wt%.
Compared with the prior art, the invention has the following beneficial effects:
the invention has scientific design, simple operation, good stability of the reinjection slurry, difficult sedimentation and no blockage of the reinjection channel.
The reinjection slurry treated by the method has good shale hydration dispersion resistance, can ensure the stability of a reinjection channel and a stratum storage space wall, and keeps the continuous effectiveness of reinjection.
The re-grouting slurry pretreated by the method has proper viscosity, static shear force, good rheological property and anti-permeability.
The reinjection slurry pretreated by the method of the invention can form a thin and tough mud cake in the reinjection construction process, so that a layer of film is attached to the originally uneven reinjection channel wall, which is beneficial to reducing the flowing resistance of the reinjection slurry and reducing the reinjection construction pressure.
The invention can prevent the blockage of the channel due to the overlarge grain diameter in the reinjection process by grinding the oil-bearing rock debris into fine powder with the grain diameter less than or equal to 300 mu m; meanwhile, the smaller particle size is also beneficial to forming stable back grouting.
In the invention, the re-grouting performance is stable and can resist 15% Na+Saline water pollution, and the temperature resistance reaches 120 ℃; and the re-grouting has stronger suspension stability, can keep rock debris particles (powder) from settling under the condition of long-time stillness, and avoids narrowing or even blocking the channel due to rock debris settling.
Detailed Description
The present invention is further illustrated by the following examples, which include, but are not limited to, the following examples.
1. The technical indexes of the invention are as follows:
the requirements of the re-grouting performance indexes are as follows:
apparent viscosity: shear rate of 170s-1When the viscosity is 70 to 160mPa.s, the shear rate is 1022s-1The apparent viscosity is 30-55 mPa.s;
the particle size of the drill cuttings: less than or equal to 300 mu m
Funnel viscosity: 64-146 s/946ml
Suspension stability: standing at 120 deg.C for 24 hr to settle at density difference of 0.05g/cm or less3(ii) a Standing at 120 deg.C for 48 hr to settle at density difference of 0.08g/cm or less3
API fluid loss: less than or equal to 10ml
2. The technical indexes and the experimental method of the embodiment data of the invention are as follows:
1) apparent viscosity: shear rate of 170s-1Apparent viscosity of70 to 160mPa.s, and the shear rate of 1022s-1The apparent viscosity is 30 to 55mPa.s
The experimental method comprises the following steps: refer to GB/T16783.1-2006 Standard.
2) The particle size of the drill cuttings: 150 to 180 μm
The experimental method comprises the following steps: the screening was performed using a standard 50 mesh screen, requiring full passage.
3) Density: 1.10 to 1.25g/cm3
The experimental method comprises the following steps: refer to GB/T16783.1-2006 Standard.
4) Funnel viscosity: 68-135 s/946ml
The experimental method comprises the following steps: refer to GB/T16783.1-2006 Standard.
5) Suspension stability: standing for 24 hours at the temperature of 120 ℃ for settling density difference of 0.03-0.05 g/cm3(ii) a Standing for 48 hours at the temperature of 120 ℃ for settling density difference of 0.04-0.08 g/cm3。
The experimental method comprises the following steps: placing the prepared reinjection slurry in a constant temperature of 120 ℃ and standing for 24 hours or 48 hours, respectively sucking slurry at 2/5 and 4/5, testing liquid density (the experimental method refers to GB/T16783.1-2006 standard) and respectively recording as rhoOn the upper part、ρLower partDifferential sedimentation density ═ ρLower part-ρOn the upper part。
6) API fluid loss: 4 to 8ml
The experimental method comprises the following steps: refer to GB/T16783.1-2006 Standard.
Example 1
The embodiment discloses a pretreatment method before reinjection of oil-free or low-oil-content rock debris by using a depleted well, which specifically comprises the following steps:
grinding the oil-containing rock debris into fine powder of 150-180 mu m, and then preparing grouting slurry according to the following mass-volume ratio relative to the volume of the slurry preparation water:
1. 1% of xanthan gum;
2. low viscosity carboxymethyl cellulose 0.5%;
3. 10% of oil-free or low-oil-content rock debris;
4. 1% of polymeric alcohol PEG;
in this example, the mass of xanthan gum, low viscosity carboxymethyl cellulose, oil-free or low oil-containing rock debris, and polyalcohol PEG is g when the volume of the slurry is mL.
The concrete preparation method of the grouting slurry comprises the following steps: adding the slurry preparation water into a slurry preparation container, sequentially adding xanthan gum and oil-free or low-oil-content rock debris according to a certain proportion, finally adding low-viscosity carboxymethyl cellulose and polyalcohol PEG, and fully stirring for 1 h.
The performance indexes of the obtained back grouting in the embodiment are as follows:
apparent viscosity: shear rate of 170s-1When the viscosity is 80mPa.s, the shear rate is 1022s-1An apparent viscosity of 35 mpa.s;
the particle size of the drill cuttings: 150-180 μm;
funnel viscosity: 71 s;
suspension stability: standing at 120 deg.C for 24 hr to settle down with density difference of 0.04g/cm3(ii) a Standing at 120 deg.C for 48 hr to settle down with density difference of 0.07g/cm3；
API fluid loss: 7.8 ml.
Example 2
The embodiment discloses a pretreatment method before reinjection of oil-free or low-oil-content rock debris by using a depleted well, which specifically comprises the following steps:
grinding the oil-containing rock debris into fine powder of 150-180 mu m, and then preparing grouting slurry according to the following mass-volume ratio relative to the volume of the slurry preparation water:
1. 1% of xanthan gum;
2. 3% of low-viscosity carboxymethyl cellulose;
3. 10% of oil-free or low-oil-content rock debris;
4. 1% of polymeric alcohol PEG
In this example, the mass of xanthan gum, low viscosity carboxymethyl cellulose, oil-free or low oil-containing rock debris, and polyalcohol PEG is g when the volume of the slurry is mL.
The concrete preparation method of the grouting slurry comprises the following steps: adding the slurry preparation water into a slurry preparation container, sequentially adding xanthan gum and oil-free or low-oil-content rock debris according to a certain proportion, finally adding low-viscosity carboxymethyl cellulose and polyalcohol PEG, and fully stirring for 1 h.
The performance indexes of the obtained back grouting in the embodiment are as follows:
apparent viscosity: shear rate of 170s-1When the viscosity is 80mPa.s, the shear rate is 1022s-1An apparent viscosity of 35 mpa.s;
the particle size of the drill cuttings: 150-180 μm;
funnel viscosity: 71 s;
suspension stability: standing at 120 deg.C for 24 hr to settle down with density difference of 0.04g/cm3(ii) a Standing at 120 deg.C for 48 hr to settle down with density difference of 0.07g/cm3；
API fluid loss: 4.4 ml.
Example 3
The embodiment discloses a pretreatment method before reinjection of oil-free or low-oil-content rock debris by using a depleted well, which specifically comprises the following steps:
grinding the oil-containing rock debris into fine powder of 150-180 mu m, and then preparing grouting slurry according to the following mass-volume ratio relative to the volume of the slurry preparation water:
1. 1% of high-viscosity carboxymethyl cellulose;
2. low viscosity carboxymethyl cellulose 0.5%;
3. 10% of oil-free or low-oil-content rock debris;
4. 1% of white asphalt;
in this example, the mass of the highly viscous carboxymethyl cellulose, the low viscous carboxymethyl cellulose, the oil-free or low-oil-containing rock debris, and the white pitch is g when the volume of the slurry is mL.
The concrete preparation method of the grouting slurry comprises the following steps: adding slurry preparation water into a slurry preparation container, sequentially adding high-viscosity carboxymethyl cellulose and oil-free or low-oil-content rock debris according to a proportion, finally adding low-viscosity carboxymethyl cellulose and white asphalt, and fully stirring for 1 h.
The performance indexes of the obtained back grouting in the embodiment are as follows:
apparent viscosity: shear rate of 170s-1When the viscosity is 88mPa.s, the shear rate is 1022s-1An apparent viscosity of 36 mPa.s;
the particle size of the drill cuttings: 150-180 μm;
funnel viscosity: 72 s;
stable suspensionAnd (3) characterization: standing at 120 deg.C for 24 hr to settle down with density difference of 0.04g/cm3(ii) a Standing at 120 deg.C for 48 hr to settle down with density difference of 0.06g/cm3；
API fluid loss: 5.8 ml.
Example 4
The embodiment discloses a pretreatment method before reinjection of oil-free or low-oil-content rock debris by using a depleted well, which specifically comprises the following steps:
grinding the oil-containing rock debris into fine powder of 150-180 mu m, and then preparing grouting slurry according to the following mass-volume ratio relative to the volume of the slurry preparation water:
1. 1% of high-viscosity carboxymethyl cellulose;
2. low viscosity carboxymethyl cellulose 0.5%;
3. 30% of oil-free or low-oil-content rock debris;
4. 2% of white asphalt;
in this example, the mass of the highly viscous carboxymethyl cellulose, the low viscous carboxymethyl cellulose, the oil-free or low-oil-containing rock debris, and the white pitch is g when the volume of the slurry is mL.
The concrete preparation method of the grouting slurry comprises the following steps: adding slurry preparation water into a slurry preparation container, sequentially adding high-viscosity carboxymethyl cellulose and oil-free or low-oil-content rock debris according to a proportion, finally adding low-viscosity carboxymethyl cellulose and white asphalt, and fully stirring for 1 h.
The performance indexes of the obtained back grouting in the embodiment are as follows:
apparent viscosity: shear rate of 170s-1When the viscosity is 90mPa.s, the shear rate is 1022s-1An apparent viscosity of 38 mpa.s;
the particle size of the drill cuttings: 150-180 μm;
funnel viscosity: 82 s;
suspension stability: standing at 120 deg.C for 24 hr to settle down with density difference of 0.05g/cm3(ii) a Standing at 120 deg.C for 48 hr to settle down with density difference of 0.08g/cm3；
API fluid loss: 5.4 ml.
Example 5
The embodiment discloses a pretreatment method before reinjection of oil-free or low-oil-content rock debris by using a depleted well, which specifically comprises the following steps:
grinding the oil-containing rock debris into fine powder of 150-180 mu m, and then preparing grouting slurry according to the following mass-volume ratio relative to the volume of the slurry preparation water:
1. 3% of high-viscosity carboxymethyl cellulose;
2. low viscosity carboxymethyl cellulose 0.5%;
3. 30% of oil-free or low-oil-content rock debris;
4. 3% of white asphalt;
in this example, the mass of the highly viscous carboxymethyl cellulose, the low viscous carboxymethyl cellulose, the oil-free or low-oil-containing rock debris, and the white pitch is g when the volume of the slurry is mL.
The concrete preparation method of the grouting slurry comprises the following steps: adding slurry preparation water into a slurry preparation container, sequentially adding high-viscosity carboxymethyl cellulose and oil-free or low-oil-content rock debris according to a proportion, finally adding low-viscosity carboxymethyl cellulose and white asphalt, and fully stirring for 2 hours.
The performance indexes of the obtained back grouting in the embodiment are as follows:
apparent viscosity: shear rate of 170s-1When the viscosity is 102mPa.s, the shear rate is 1022s-1An apparent viscosity of 46 mPa.s;
the particle size of the drill cuttings: 150-180 μm;
funnel viscosity: 121 s;
suspension stability: standing at 120 deg.C for 24 hr to settle down with density difference of 0.04g/cm3(ii) a Standing at 120 deg.C for 48 hr to settle down with density difference of 0.03g/cm3；
API fluid loss: 4.2 ml.
Example 6
The embodiment discloses a pretreatment method before reinjection of oil-free or low-oil-content rock debris by using a depleted well, which specifically comprises the following steps:
grinding the oil-containing rock debris into fine powder of 150-180 mu m, and then preparing grouting slurry according to the following mass-volume ratio relative to the volume of the slurry preparation water:
1. 3% of high-viscosity carboxymethyl cellulose;
2. 3% of carboxymethyl starch;
3. 30% of oil-free or low-oil-content rock debris;
4. 3% of white asphalt;
in this example, the mass of the highly viscous carboxymethyl cellulose, the carboxymethyl starch, the oil-free or low-oil content rock debris, and the white pitch is g when the volume of the slurry preparation water is mL.
The concrete preparation method of the grouting slurry comprises the following steps: adding slurry preparation water into a slurry preparation container, sequentially adding high-viscosity carboxymethyl cellulose and oil-free or low-oil-content rock debris according to a certain proportion, finally adding carboxymethyl starch and white asphalt, and fully stirring for 2 hours.
The performance indexes of the obtained back grouting in the embodiment are as follows:
apparent viscosity: shear rate of 170s-1When the viscosity is 100mPa.s, the shear rate is 1022s-1An apparent viscosity of 44 mpa.s;
the particle size of the drill cuttings: 150-180 μm;
funnel viscosity: 118 s;
suspension stability: standing at 120 deg.C for 24 hr to settle at density difference of 0.03g/cm3(ii) a Standing at 120 deg.C for 48 hr to settle down with density difference of 0.05g/cm3；
API fluid loss: 4.0 ml.
Example 7
The embodiment discloses a pretreatment method before reinjection of oil-free or low-oil-content rock debris by using a depleted well, which specifically comprises the following steps:
grinding the oil-containing rock debris into fine powder of 150-180 mu m, and then preparing grouting slurry according to the following mass-volume ratio relative to the volume of the slurry preparation water:
1. 3% of high-viscosity carboxymethyl cellulose;
2. polyanionic cellulose 3%;
3. 30% of oil-free or low-oil-content rock debris;
4. 3% of white asphalt;
in this example, the mass of the highly viscous carboxymethyl cellulose, the polyanionic fiber, the oil-free or low-oil content rock debris, and the white pitch is g when the volume of the slurry is mL.
The concrete preparation method of the grouting slurry comprises the following steps: adding slurry preparation water into a slurry preparation container, sequentially adding high-viscosity carboxymethyl cellulose and oil-free or low-oil-content rock debris according to a certain proportion, finally adding polyanion fiber and white asphalt, and fully stirring for 2 h.
The performance indexes of the obtained back grouting in the embodiment are as follows:
apparent viscosity: shear rate of 170s-1When the viscosity is 102mPa.s, the shear rate is 1022s-1An apparent viscosity of 46 mPa.s;
the particle size of the drill cuttings: 150-180 μm;
funnel viscosity: 116 s;
suspension stability: standing at 120 deg.C for 24 hr to settle at density difference of 0.03g/cm3(ii) a Standing at 120 deg.C for 48 hr to settle down with density difference of 0.04g/cm3；
API fluid loss: 4.6 ml.
Comparative example 1
Compared with example 4, the dosage of the suspending agent is reduced, and the rest conditions are the same; the method specifically comprises the following steps:
grinding the oil-containing rock debris into fine powder of 150-180 mu m, and then preparing grouting slurry according to the following mass-volume ratio relative to the volume of the slurry preparation water:
1. high viscosity carboxymethyl cellulose 0.5%;
2. low viscosity carboxymethyl cellulose 0.5%;
3. 30% of oil-free or low-oil-content rock debris;
4. 2% of white asphalt;
in this example, the mass of the highly viscous carboxymethyl cellulose, the low viscous carboxymethyl cellulose, the oil-free or low-oil-containing rock debris, and the white pitch is g when the volume of the slurry is mL.
The concrete preparation method of the grouting slurry comprises the following steps: adding slurry preparation water into a slurry preparation container, sequentially adding high-viscosity carboxymethyl cellulose and oil-free or low-oil-content rock debris according to a proportion, finally adding low-viscosity carboxymethyl cellulose and white asphalt, and fully stirring for 1 h.
The performance indexes of the obtained back grouting in the embodiment are as follows:
apparent viscosity: shear rate of 170s-1Time, appearanceThe viscosity was 89 mPas, the shear rate was 1022s-1An apparent viscosity of 36 mPa.s;
the particle size of the drill cuttings: 150-180 μm;
funnel viscosity: 81 s;
suspension stability: standing at 120 ℃ for 24 hours to settle the density difference of 0.06g/cm3(ii) a Standing at 120 deg.C for 48 hr to settle down with density difference of 0.11g/cm3；
API fluid loss: 6.6 ml.
The experimental results show that: when the addition amount of the suspending agent is insufficient, the stability of the re-grouting is poor and the suspending capability is poor.
Comparative example 2
Compared with example 4, the comparative example does not use the anti-collapse inhibitor, and the rest conditions are the same; the method specifically comprises the following steps:
grinding the oil-containing rock debris into fine powder of 150-180 mu m, and then preparing grouting slurry according to the following mass-volume ratio relative to the volume of the slurry preparation water:
1. high viscosity carboxymethyl cellulose 0.5%;
2. low viscosity carboxymethyl cellulose 0.5%;
3. 30% of oil-free or low-oil-content rock debris;
4. 0% of white asphalt;
in this example, the mass of the highly viscous carboxymethyl cellulose, the low viscous carboxymethyl cellulose, and the oil-free or low-oil-containing rock debris is g in the volume of the slurry preparation water mL.
The concrete preparation method of the grouting slurry comprises the following steps: adding slurry preparation water into a slurry preparation container, sequentially adding high-viscosity carboxymethyl cellulose and oil-free or low-oil-content rock debris according to a certain proportion, finally adding low-viscosity carboxymethyl cellulose, and fully stirring for 1 h.
The performance indexes of the obtained back grouting in the embodiment are as follows:
apparent viscosity: shear rate of 170s-1When the viscosity is 88mPa.s, the shear rate is 1022s-1An apparent viscosity of 35 mpa.s;
the particle size of the drill cuttings: 150-180 μm;
funnel viscosity: 83 s;
suspension stability: temperature of 120 deg.CStanding for 24h for settling density difference of 0.05g/cm3(ii) a Standing at 120 deg.C for 48 hr to settle down with density difference of 0.07g/cm3；
API fluid loss: 6.6 ml.
The re-grouting inhibition performance was evaluated as follows:
the reinjection slurry of example 4 and the reinjection slurry of comparative example 2 are taken as test liquids respectively to perform a shale rolling dispersion experiment to evaluate the inhibition performance.
Experimental reference standard: SY/T5613-.
Example 4 re-grouting rolling recovery: 40.2 percent;
comparative example 2 re-grouting rolling recovery: 6.4 percent.
Experiments show that: the anti-collapse inhibitor is not added, the mud shale hydration dispersion resistance of the re-grouting is poor, and the stability of the well wall is not facilitated.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The pretreatment method before reinjection of oil-free or low-oil-content rock debris by using a depleted well is characterized in that the oil-free or low-oil-content rock debris is ground into fine powder with the particle size of less than or equal to 300 mu m and then is uniformly mixed with slurry preparation water, a suspending agent, a filtrate reducer and an anti-collapse inhibitor to prepare reinjection slurry.
2. The method for pretreating the non-oil or low-oil rock debris before reinjection by using the depleted well according to claim 1, wherein in the reinjection slurry, the mass-to-volume ratio of each component to the slurry preparation water is as follows: 1 to 3 percent of suspending agent, 0.5 to 3 percent of filtrate reducer, 0.5 to 3 percent of anti-collapse inhibitor and 10 to 30 percent of oil-free or low-oil-content rock debris; when the volume is mL, the mass is g.
3. The method for pretreating oil-free or low-oil-content rock debris before reinjection by using a depleted well according to claim 1 or 2, wherein the slurrying water is selected from any one or more of tap water, river and lake water and gas field water.
4. The method for pretreating oil-free or low-oil cuttings before reinjection by using depleted wells according to claim 1 or 2, wherein the suspending agent is any one or more of xanthan gum, guar gum and high-viscosity carboxymethyl cellulose.
5. The method for pretreating oil-free or low-oil-content rock debris before reinjection into a depleted well according to claim 1 or 2, wherein the fluid loss additive is any one or more of low-viscosity carboxymethyl cellulose CMC-LVT, carboxymethyl starch and polyanionic cellulose PAC.
6. The method for pretreating oil-free or low-oil-content rock debris before reinjection into a depleted well according to claim 1 or 2, wherein the anti-collapse inhibitor is selected from one or more of polyalcohol PEG and white asphalt.
7. The method for pretreating oil-free or low-oil-content rock debris before reinjection into a depleted well according to claim 1 or 2, wherein the oil-free or low-oil-content rock debris is ground into fine powder with the particle size of 150-180 μm.
8. The method for pretreating the non-oil or low-oil rock debris before reinjection into the depleted well according to the claim 1 or 2, wherein the reinjection method is specifically prepared by the following steps: adding slurry preparation water into a slurry preparation container, then sequentially adding a suspending agent, oil-free or low-oil rock debris, a filtrate reducer and an anti-collapse inhibitor according to a proportion, and fully stirring.
9. The method of claim 6, wherein the shear rate is 170s for pre-treatment of oil-free or low-oil cuttings before reinjection into depleted wells-1Then, the apparent viscosity of the grouting slurry is 70-160 mPa.s; shear rate of 1022s-1And the apparent viscosity of the reinjection slurry is 30-55 mPa.s.
10. The method for pretreating oil-free or low-oil cuttings before reinjection by using depleted wells according to claim 6, wherein the funnel viscosity of the reinjection slurry is 64-146 s/946 ml; or/and the API filtration loss is less than or equal to 10 ml; or/and the suspension stability of the back grouting is as follows: standing at 120 deg.C for 24 hr to settle at density difference of 0.05g/cm or less3(ii) a Standing at 120 deg.C for 48 hr to settle at density difference of 0.08g/cm or less3。
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| CN113653452A (en) * | 2021-09-09 | 2021-11-16 | 中国石油大学(北京) | Oil-based drilling mixture reinjection composition, oil-based drilling mixture reinjection slurry, and preparation method and application thereof |
| CN114673483A (en) * | 2022-04-11 | 2022-06-28 | 西南石油大学 | Method for determining limit reinjection space of reinjection well in consideration of seepage pressure drop |
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| CN113653452B (en) * | 2021-09-09 | 2022-10-25 | 中国石油大学(北京) | Oil-based drilling mixture reinjection composition, oil-based drilling mixture reinjection slurry, and preparation method and application thereof |
| CN114673483A (en) * | 2022-04-11 | 2022-06-28 | 西南石油大学 | Method for determining limit reinjection space of reinjection well in consideration of seepage pressure drop |
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