CN111305777A - Method for pretreating cuttings treated by quicklime before reinjection by using depleted well - Google Patents
Method for pretreating cuttings treated by quicklime before reinjection by using depleted well Download PDFInfo
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- CN111305777A CN111305777A CN201911226671.9A CN201911226671A CN111305777A CN 111305777 A CN111305777 A CN 111305777A CN 201911226671 A CN201911226671 A CN 201911226671A CN 111305777 A CN111305777 A CN 111305777A
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- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 title claims abstract description 151
- 239000000292 calcium oxide Substances 0.000 title claims abstract description 76
- 235000012255 calcium oxide Nutrition 0.000 title claims abstract description 75
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000005520 cutting process Methods 0.000 title claims description 28
- 239000002002 slurry Substances 0.000 claims abstract description 102
- 239000011435 rock Substances 0.000 claims abstract description 53
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 42
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000011575 calcium Substances 0.000 claims abstract description 19
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 19
- 239000000843 powder Substances 0.000 claims abstract description 19
- 239000002245 particle Substances 0.000 claims abstract description 18
- 238000002203 pretreatment Methods 0.000 claims abstract description 13
- 239000000375 suspending agent Substances 0.000 claims abstract description 10
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 7
- 239000000706 filtrate Substances 0.000 claims abstract description 7
- 238000002360 preparation method Methods 0.000 claims description 54
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 42
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 34
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 34
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims description 34
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims description 34
- 239000000230 xanthan gum Substances 0.000 claims description 17
- 229920001285 xanthan gum Polymers 0.000 claims description 17
- 235000010493 xanthan gum Nutrition 0.000 claims description 17
- 229940082509 xanthan gum Drugs 0.000 claims description 17
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 16
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 16
- 239000000725 suspension Substances 0.000 claims description 15
- 238000003756 stirring Methods 0.000 claims description 12
- 239000004567 concrete Substances 0.000 claims description 11
- 235000017557 sodium bicarbonate Nutrition 0.000 claims description 8
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 8
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 8
- 229920002907 Guar gum Polymers 0.000 claims description 5
- 229920002472 Starch Polymers 0.000 claims description 5
- 125000002057 carboxymethyl group Chemical group [H]OC(=O)C([H])([H])[*] 0.000 claims description 5
- 229920002678 cellulose Polymers 0.000 claims description 5
- 239000001913 cellulose Substances 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 5
- 239000000665 guar gum Substances 0.000 claims description 5
- 235000010417 guar gum Nutrition 0.000 claims description 5
- 229960002154 guar gum Drugs 0.000 claims description 5
- 239000008107 starch Substances 0.000 claims description 5
- 235000019698 starch Nutrition 0.000 claims description 5
- 239000000654 additive Substances 0.000 claims description 3
- 230000000996 additive effect Effects 0.000 claims description 3
- 239000003672 gas field water Substances 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 2
- 239000008399 tap water Substances 0.000 claims description 2
- 235000020679 tap water Nutrition 0.000 claims description 2
- 239000008186 active pharmaceutical agent Substances 0.000 claims 1
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 abstract description 9
- 229910001424 calcium ion Inorganic materials 0.000 abstract description 9
- 230000002411 adverse Effects 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 6
- 238000004062 sedimentation Methods 0.000 abstract description 5
- 230000035699 permeability Effects 0.000 abstract description 3
- 238000013461 design Methods 0.000 abstract description 2
- 230000008030 elimination Effects 0.000 abstract 1
- 238000003379 elimination reaction Methods 0.000 abstract 1
- 235000011121 sodium hydroxide Nutrition 0.000 description 13
- 238000000227 grinding Methods 0.000 description 10
- 238000002474 experimental method Methods 0.000 description 8
- 238000010276 construction Methods 0.000 description 7
- 235000017550 sodium carbonate Nutrition 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000005553 drilling Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 244000046052 Phaseolus vulgaris Species 0.000 description 1
- 235000010627 Phaseolus vulgaris Nutrition 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 230000003487 anti-permeability effect Effects 0.000 description 1
- 238000010170 biological method Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000001804 emulsifying effect Effects 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 230000005764 inhibitory process Effects 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
- 229920000447 polyanionic polymer Polymers 0.000 description 1
- 238000000197 pyrolysis Methods 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
- 238000012360 testing method Methods 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
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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/06—Arrangements for treating drilling fluids outside the borehole
- E21B21/068—Arrangements for treating drilling fluids outside the borehole using chemical treatment
-
- 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
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Geochemistry & Mineralogy (AREA)
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Abstract
The invention discloses a pretreatment method before reinjection of detritus treated by quicklime by using a depleted well, which solves the problems that the stability of reinjection slurry is poor, sedimentation is easy, permeability resistance is poor, a reinjection channel is easy to block, and divalent calcium ions have adverse effects on the performance of the reinjection slurry in the prior art. The invention relates to a pretreatment method before reinjection of rock debris treated by quicklime, which is characterized in that the rock debris treated by the quicklime is ground into fine powder with the particle size of less than or equal to 300 mu m, and then is uniformly mixed with slurrying water, a suspending agent, a filtrate reducer and a calcium remover to prepare reinjection slurry. The method has the advantages of scientific design, simple operation, good stability of the reinjection slurry, difficult sedimentation, no blockage of the reinjection channel and elimination of the adverse effect of divalent calcium ions on the performance of the reinjection slurry.
Description
Technical Field
The invention belongs to the field of petroleum drilling waste treatment, and particularly relates to a pretreatment method before reinjection of cuttings treated by quicklime by a depleted well, wherein the cuttings are subjected to quicklime gel breaking and drying treatment aiming at cuttings treated by quicklime generated when oil-based drilling fluid is used for drilling operation of shale gas wells and horizontal wells.
Background
At present, the disposal technology of the detritus after quicklime treatment generally adopts solidification, drying, physical separation, incineration, pyrolysis and biological method technology. Each of the above methods has certain limitations. The depleted well is used as a storage space of the detritus treated by the quicklime, the detritus treated by the quicklime 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 through a reinjection pump for storage, so that the problem of disposal of the detritus treated by the high quicklime can be effectively solved.
In the prior art, when rock debris is prepared into grouting slurry and injected into a well, the stability is poor, the rock debris is easy to settle and a grouting channel is easy to block, and meanwhile, as the grouting slurry is a water dispersion system, if the inhibition and the filtrate loss reduction performance are poor, a thick mud cake is easy to form 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, because the quick lime contains a large amount of divalent calcium ions, the performance of back grouting is greatly influenced, and the concrete expression is as follows: the drilling fluid is remarkably increased in water loss, viscosity and shearing force, poor in fluidity and incapable of meeting construction requirements. Therefore, the problem to be solved by the technical personnel in the field is to provide a pretreatment method before reinjection of the cuttings treated by quick lime by using the depleted well, and to add a proper amount of calcium remover to ensure that the reinjection slurry has proper viscosity, static shearing force and good rheological property so as to meet the reinjection construction requirement.
Disclosure of Invention
The technical problem solved by the invention is as follows: the method for pretreating the cuttings treated by quick lime before reinjection by using the depleted well solves the problems that in the prior art, reinjection slurry is poor in stability, easy to settle, poor in permeability resistance, easy to block a reinjection channel and divalent calcium ions have adverse effects on the performance of the reinjection slurry.
The technical scheme adopted by the invention is as follows:
the invention relates to a pretreatment method before reinjection of quicklime-treated rock debris by using a depleted well, which is characterized in that the quicklime-treated 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 a calcium remover to prepare reinjection slurry.
The reinjection slurry treated by the method has good suspension stability, salt pollution resistance, temperature resistance and permeability resistance, can meet the requirements of reinjection construction, and eliminates the adverse effect of divalent calcium ions on the performance of the reinjection slurry.
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 an emulsion system.
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: 1-3% of suspending agent, 0.5-3% of filtrate reducer, 3-5% of calcium remover and 10-30% of rock debris treated by quicklime; 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, and a thin and tough mud cake can be formed on the reinjection channel wall, so that a thin film is attached to the original uneven reinjection channel wall, and the reinjection method is favorable for reducing the flowing resistance of reinjection slurry and reducing the pressure of reinjection construction.
The calcium remover is any one or more of sodium hydroxide, sodium carbonate and sodium bicarbonate.
According to the invention, the calcium remover is added into the reinjection slurry, so that free divalent calcium ions in the reinjection slurry can be effectively removed, and the huge adverse effect of the divalent calcium ions on the performance of the reinjection slurry is avoided.
Grinding the rock debris treated by the quicklime 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, a calcium removing agent, oil-free or low-quicklime-treated rock debris and a filtrate reducer 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;
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。
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 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 re-grouting performance after the pretreatment by the method is stable, and the adverse effect of divalent calcium ions on the re-grouting performance is eliminated.
According to the invention, rock debris treated by quicklime is ground into fine powder with the particle size of less than or equal to 300 microns, so that a channel cannot be blocked due to overlarge particle size in the reinjection process; meanwhile, the smaller particle size is also beneficial to forming a stable emulsifying system.
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-1When the viscosity is 70 to 160mPa.s, the shear rate is 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 rock debris treated by quicklime by using a depleted well, which specifically comprises the following steps:
grinding the rock debris treated by the quicklime 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 rock debris treated by quicklime;
4. 3 percent of sodium hydroxide
In this example, when the volume of the slurry preparation water is mL, the mass of the rock debris treated with xanthan gum, low viscosity carboxymethyl cellulose, sodium hydroxide, and quicklime is g.
The concrete preparation method of the grouting slurry comprises the following steps: adding slurry preparation water into a slurry preparation container, sequentially adding rock debris treated by xanthan gum, sodium hydroxide and quicklime 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 rateIs 170s-1When the viscosity is 81mPa.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: 70 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 0.06g/cm3；
API fluid loss: 7.8 ml.
Example 2
The embodiment discloses a pretreatment method before reinjection of rock debris treated by quicklime by using a depleted well, which specifically comprises the following steps:
grinding the rock debris treated by the quicklime 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 rock debris treated by quicklime;
4. 3 percent of sodium hydroxide
In this example, when the volume of the slurry preparation water is mL, the mass of the rock debris treated with xanthan gum, low viscosity carboxymethyl cellulose, sodium hydroxide, and quicklime is g.
The concrete preparation method of the grouting slurry comprises the following steps: adding slurry preparation water into a slurry preparation container, sequentially adding rock debris treated by xanthan gum, sodium hydroxide and quicklime 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 82mPa.s, the shear rate is 1022s-1An apparent viscosity of 33 mpa.s;
the particle size of the drill cuttings: 150-180 μm;
funnel viscosity: 75 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.CThe sedimentation density difference is 0.07g/cm in 48h3；
API fluid loss: 4.4 ml.
Example 3
The embodiment discloses a pretreatment method before reinjection of rock debris treated by quicklime by using a depleted well, which specifically comprises the following steps:
grinding the rock debris treated by the quicklime 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 rock debris treated by quicklime;
4. 3 percent of sodium carbonate
In this example, when the volume of the slurry preparation water is mL, the mass of the detritus after the treatment of the high-viscosity carboxymethyl cellulose, the low-viscosity carboxymethyl cellulose, the sodium carbonate, and the quicklime is g.
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, sodium carbonate and quicklime treated 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 36 mPa.s;
the particle size of the drill cuttings: 150-180 μm;
funnel viscosity: 72 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 0.06g/cm3；
API fluid loss: 5.8 ml.
Example 4
The embodiment discloses a pretreatment method before reinjection of rock debris treated by quicklime by using a depleted well, which specifically comprises the following steps:
grinding the rock debris treated by the quicklime 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. 1.5% of guar gum;
2. polyanionic cellulose 0.5%;
3. 30% of rock debris treated by quicklime;
4. 5% of sodium carbonate;
in this example, when the volume of the slurry preparation water is mL, the mass of the rock debris treated with guar gum, polyanionic cellulose, sodium carbonate, and quicklime is g.
The concrete preparation method of the grouting slurry comprises the following steps: adding prepared slurry water into a slurry preparation container, then sequentially adding guar gum, sodium carbonate and rock debris treated by quick lime according to a certain proportion, finally adding polyanionic 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 90mPa.s, the shear rate is 1022s-1An apparent viscosity of 37 mPa.s;
the particle size of the drill cuttings: 150-180 μm;
funnel viscosity: 81 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 rock debris treated by quicklime by using a depleted well, which specifically comprises the following steps:
grinding the rock debris treated by the quicklime 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 rock debris treated by quicklime;
4. sodium bicarbonate 3%
In this example, when the volume of the slurry preparation water is mL, the mass of the detritus after the treatment of the high-viscosity carboxymethyl cellulose, the low-viscosity carboxymethyl cellulose, the sodium bicarbonate and the quicklime is g.
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, sodium bicarbonate and quicklime treated rock debris according to a certain proportion, finally adding low-viscosity carboxymethyl cellulose, 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: 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: 4.0 ml.
Example 6
The embodiment discloses a pretreatment method before reinjection of rock debris treated by quicklime by using a depleted well, which specifically comprises the following steps:
grinding the rock debris treated by the quicklime 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 rock debris treated by quicklime;
4. sodium bicarbonate 5%
In this example, when the volume of the slurry preparation water is mL, the mass of the detritus after the treatment of the high-viscosity carboxymethyl cellulose, the carboxymethyl starch, the sodium bicarbonate and the quicklime is g.
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, sodium bicarbonate and rock debris treated by quick lime according to a certain proportion, finally adding carboxymethyl starch, 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 100mPa.s, the shear rate is 1022s-1An apparent viscosity of 45 mpa.s;
the particle size of the drill cuttings: 150-180 μm;
funnel viscosity: 109 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: 4.4 ml.
Comparative example 1
Compared with the embodiment 1, the comparative example does not add the calcium remover, and the other conditions are the same; the method specifically comprises the following steps:
grinding the rock debris treated by the quicklime 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 rock debris treated by quicklime;
in this example, when the volume of the slurry preparation water is mL, the mass of the rock debris treated with xanthan gum, low viscosity carboxymethyl cellulose, and quicklime is g.
The concrete preparation method of the grouting slurry comprises the following steps: adding slurry preparation water into a slurry preparation container, sequentially adding rock debris treated by xanthan gum and quicklime 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:
the re-grouting is observed to be bean curd-shaped, and the fluidity is lost, so that the re-grouting construction requirement is not met. So no other performance is tested.
The experimental results show that: the re-grouting performance is seriously deteriorated without adding a calcium remover.
Comparative example 2
Compared with the embodiment 1, the comparative example reduces the dosage of the calcium removing agent, and the other conditions are the same; the method specifically comprises the following steps:
grinding the rock debris treated by the quicklime 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 rock debris treated by quicklime;
4. 2 percent of sodium hydroxide
In this example, when the volume of the slurry preparation water is mL, the mass of the rock debris treated with xanthan gum, low viscosity carboxymethyl cellulose, sodium hydroxide, and quicklime is g.
The concrete preparation method of the grouting slurry comprises the following steps: adding slurry preparation water into a slurry preparation container, sequentially adding rock debris treated by xanthan gum, sodium hydroxide and quicklime 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 198mPa.s, the shear rate is 1022s-1The apparent viscosity is 76 mPa.s;
the particle size of the drill cuttings: 150-180 μm;
funnel viscosity: 144 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 0.12g/cm3；
API fluid loss: 33.4 ml.
The experimental results show that: the dosage of the calcium removing agent is insufficient, and the re-grouting performance is greatly influenced by divalent calcium ions. Compared with example 1, the apparent viscosity and funnel viscosity of the composite material are obviously higher than those of example 1, the suspension stability of the composite material is not as good as that of example 1, and the API (American Petroleum institute) fluid loss is obviously higher than that of example 1.
Comparative example 3
Compared with the example 1, the calcium removing agent is added to be excessive, and the other conditions are the same; the method specifically comprises the following steps:
grinding the rock debris treated by the quicklime 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 rock debris treated by quicklime;
4. 6 percent of sodium hydroxide
In this example, when the volume of the slurry preparation water is mL, the mass of the rock debris treated with xanthan gum, low viscosity carboxymethyl cellulose, sodium hydroxide, and quicklime is g.
The concrete preparation method of the grouting slurry comprises the following steps: adding slurry preparation water into a slurry preparation container, sequentially adding rock debris treated by xanthan gum, sodium hydroxide and quicklime 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 80mPa.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: 69 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 0.06g/cm3；
API fluid loss: 7.6 ml.
The experimental results show that: excessive calcium remover has little influence on the performance, but considering that the excessive calcium remover can cause the alkalinity of the re-grouting to be too high and easily cause the corrosion of equipment and pipelines, the excessive addition of the calcium remover is not recommended.
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. A pre-treatment method for the cuttings treated by quicklime before reinjection by using a depleted well is characterized in that the cuttings treated by the quicklime are ground into fine powder with the grain size of less than or equal to 300 mu m, and then the fine powder is uniformly mixed with prepared slurry water, a suspending agent, a filtrate reducer and a calcium remover to prepare reinjection slurry.
2. The method for pretreating cuttings treated by quicklime before reinjection by using depleted wells according to claim 1, wherein in the reinjection slurry, the mass-to-volume ratio of each component to slurry preparation water is as follows: 1-3% of suspending agent, 0.5-3% of filtrate reducer, 3-5% of calcium remover and 10-30% of rock debris treated by quicklime; when the volume is mL, the mass is g.
3. The method for pretreating the cuttings treated by the quick lime before reinjection by using the depleted well as claimed in 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 the cuttings treated by the quicklime before reinjection by using the depleted well as in 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 cuttings treated by quick lime before reinjection by using a depleted well as claimed in claim 1 or 2, wherein the fluid loss additive is any one or more selected from low-viscosity carboxymethyl cellulose, carboxymethyl starch and polyanionic cellulose.
6. The method for pretreating the cuttings treated by the quicklime before reinjection by using the depleted well as in claim 1 or 2, wherein the calcium remover is any one or more of sodium hydroxide, sodium carbonate and sodium bicarbonate.
7. The method for pretreating the cuttings treated by the quicklime before reinjection by using the depleted well as claimed in claim 1 or 2, wherein the cuttings treated by the quicklime are ground into fine powder with the particle size of 150-180 μm.
8. The method for pretreating the cuttings treated by the quicklime before reinjection by using the depleted well according to claim 1 or 2, wherein the concrete preparation method of the reinjection slurry comprises the following steps: adding the slurry preparation water into a slurry preparation container, then sequentially adding the suspending agent, the calcium removing agent, the rock debris treated by the quicklime and the fluid loss additive according to the proportion, and fully stirring.
9. The method of claim 6, wherein the shear rate is 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.
10. The method for pretreating cuttings treated by quicklime 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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