CN110846005A - Pretreatment method before reinjection of depleted well by utilizing high-oil-content rock debris - Google Patents
Pretreatment method before reinjection of depleted well by utilizing high-oil-content rock debris Download PDFInfo
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- 239000011435 rock Substances 0.000 title claims abstract description 82
- 238000002203 pretreatment Methods 0.000 title claims abstract description 23
- 239000002002 slurry Substances 0.000 claims abstract description 85
- 238000002360 preparation method Methods 0.000 claims abstract description 43
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 39
- 239000000843 powder Substances 0.000 claims abstract description 19
- 239000002245 particle Substances 0.000 claims abstract description 18
- 239000004094 surface-active agent Substances 0.000 claims abstract description 15
- 239000000375 suspending agent Substances 0.000 claims abstract description 10
- 239000000230 xanthan gum Substances 0.000 claims description 18
- 229920001285 xanthan gum Polymers 0.000 claims description 18
- 235000010493 xanthan gum Nutrition 0.000 claims description 18
- 229940082509 xanthan gum Drugs 0.000 claims description 18
- 239000000725 suspension Substances 0.000 claims description 16
- 239000008186 active pharmaceutical agent Substances 0.000 claims description 13
- 229920002907 Guar gum Polymers 0.000 claims description 11
- 239000000665 guar gum Substances 0.000 claims description 11
- 235000010417 guar gum Nutrition 0.000 claims description 11
- 229960002154 guar gum Drugs 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 11
- NWGKJDSIEKMTRX-AAZCQSIUSA-N Sorbitan monooleate Chemical compound CCCCCCCC\C=C/CCCCCCCC(=O)OC[C@@H](O)[C@H]1OC[C@H](O)[C@H]1O NWGKJDSIEKMTRX-AAZCQSIUSA-N 0.000 claims description 10
- 235000010482 polyoxyethylene sorbitan monooleate Nutrition 0.000 claims description 10
- 229920000053 polysorbate 80 Polymers 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 10
- 239000003672 gas field water Substances 0.000 claims description 3
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 2
- IGFHQQFPSIBGKE-UHFFFAOYSA-N Nonylphenol Natural products CCCCCCCCCC1=CC=C(O)C=C1 IGFHQQFPSIBGKE-UHFFFAOYSA-N 0.000 claims description 2
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 2
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims description 2
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims description 2
- 238000001914 filtration Methods 0.000 claims description 2
- SNQQPOLDUKLAAF-UHFFFAOYSA-N nonylphenol Chemical compound CCCCCCCCCC1=CC=CC=C1O SNQQPOLDUKLAAF-UHFFFAOYSA-N 0.000 claims description 2
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 2
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 2
- 239000008399 tap water Substances 0.000 claims description 2
- 235000020679 tap water Nutrition 0.000 claims description 2
- 238000004062 sedimentation Methods 0.000 abstract description 6
- 238000013461 design Methods 0.000 abstract description 2
- 238000005520 cutting process Methods 0.000 description 11
- 238000000227 grinding Methods 0.000 description 11
- 238000002474 experimental method Methods 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 5
- 239000000839 emulsion Substances 0.000 description 5
- 229920000136 polysorbate Polymers 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000005553 drilling Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 238000010170 biological method Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000001804 emulsifying effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007764 o/w emulsion Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 238000004064 recycling Methods 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
- 238000010008 shearing Methods 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000007790 solid phase 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
- 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
- C09K8/26—Oil-in-water emulsions
- C09K8/28—Oil-in-water emulsions containing organic additives
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- 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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- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- Geochemistry & Mineralogy (AREA)
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- Oil, Petroleum & Natural Gas (AREA)
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- Organic Chemistry (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention discloses a pretreatment method before reinjection of a depleted well by utilizing high-oil-content rock debris, and solves the problems that reinjection slurry in the prior art is poor in stability, easy to settle and easy to block a reinjection channel. The invention relates to a pretreatment method before reinjection of high-oil-content rock debris by using a depleted well, which is characterized in that the 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 and a surfactant 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.
Description
Technical Field
The invention belongs to the field of petroleum drilling waste treatment, and particularly relates to a pretreatment method before reinjection of a high-oil-content rock debris utilization depleted well, which is generated when an oil-based drilling fluid is used for drilling operation in a shale gas well and a horizontal well.
Background
At present, the disposal technology of the oil-containing rock debris generally adopts solidification, drying, physical separation, incineration, pyrolysis and biological method technologies. Each of the above methods has certain limitations. The exhausted well is used as a storage space of the oil-bearing rock debris, the oil-bearing rock debris is intensively transported, 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 high-oil-bearing rock debris can be effectively solved.
In the prior art, when the oil-containing rock debris is prepared into the reinjection slurry to be injected into the underground well, the problems of poor stability, easy sedimentation and easy blockage of a reinjection channel exist, and the application of the method is greatly limited. Therefore, the pre-treatment method before reinjection of the high-oil-content rock debris by using the depleted well is provided, so that the reinjection slurry has proper viscosity, static shearing force and good rheological property to meet the requirement of reinjection construction; good stability, difficult sedimentation and no blockage of reinjection channels, and becomes a problem to be solved urgently by the technical personnel in the field.
Disclosure of Invention
The technical problem solved by the invention is as follows: the method for pretreating the high-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 and easy to block a reinjection channel.
The technical scheme adopted by the invention is as follows:
the invention relates to a pretreatment method before reinjection of high-oil-content rock debris by using a depleted well, which is characterized in that the oil-content 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 and a surfactant to prepare reinjection slurry.
The reinjection slurry treated by the method has good suspension stability, salt pollution resistance and temperature resistance, and can meet the requirements of reinjection construction.
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: 0.5 to 2.5 percent of suspending agent, 0.5 to 5 percent of surfactant and 10 to 30 percent of high oil-bearing 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 surfactant is selected from one or more of nonylphenol polyoxyethylene ether, span 80 and tween 80.
The high oil-containing rock debris is wetted by oil and is not dispersed in water, and the surface of the high oil-containing rock debris is modified by adding a surfactant to change the high oil-containing rock debris into hydrophilic rock debris; meanwhile, the stability of the system can be ensured only by forming an emulsion system after the higher oil content is mixed with water, and the stability of the emulsion system is facilitated by adding the surfactant.
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 and a surfactant according to a proportion, finally adding high-oil-content rock debris, and fully stirring.
Specifically, the stirring time is 1-2 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 oil content of the high-oil-content rock debris is more than or equal to 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 re-grouting slurry pretreated by the method has proper viscosity, static shear force and good rheological property.
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 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 ℃; the re-grouting has stronger suspension stability, can keep rock debris particles (powder) from settling under the condition of long-time stillness, and avoids the phenomenon that the channel is narrowed or even blocked due to the rock debris settling; a stable oil-in-water emulsion system is formed, and the rock debris can be well dispersed in the oil-in-water system.
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) Solid phase content: 10 to 30 percent
The experimental method comprises the following steps: refer to GB/T16783.1-2006 Standard.
5) Funnel viscosity: 64-85 s/946ml
The experimental method comprises the following steps: refer to GB/T16783.1-2006 Standard.
6) Suspension stability: standing for 24 hours at the temperature of 120 ℃ for settling density difference of 0.02-0.04 g/cm3(ii) a Standing for 48 hours at the temperature of 120 ℃ for settling density difference of 0.03-0.07 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。
7) API fluid loss: 2 to 7ml
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 high-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. 0.5% of xanthan gum;
2. span 800.5%;
3. 10% of oil-containing rock debris;
in this example, when the volume of the slurry preparation water is mL, the mass of the xanthan gum, the span 80 and the oil-containing rock debris is g.
The concrete preparation method of the grouting slurry comprises the following steps: adding the slurry preparation water into a slurry preparation container, then sequentially adding xanthan gum and span 80 according to the proportion, finally adding the oil-containing rock debris, 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 76mPa.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: 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 0.07g/cm3；
API fluid loss: 6.2 ml.
Example 2
The embodiment discloses a pretreatment method before reinjection of high-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. 0.5% of guar gum;
2. tween 800.5%;
3. 10% of oil-containing rock debris;
in this example, when the volume of the slurrying water is mL, the mass of the guar gum, tween 80, and the oil-containing rock debris is g.
The concrete preparation method of the grouting slurry comprises the following steps: adding prepared slurry water into a slurry preparation container, sequentially adding guar gum and tween 80 according to a certain proportion, finally adding oil-containing rock debris, and fully stirring for 2 h.
The performance indexes of the back grouting of the embodiment are as follows:
apparent viscosity: shear rate of 170s-1When the viscosity is 75mPa.s, the shear rate is 1022s-1The apparent viscosity is 34 mPa.s;
the particle size of the drill cuttings: 150-180 μm;
funnel viscosity: 68 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.CSetting for 48h, the sedimentation density difference is 0.07g/cm3；
API fluid loss: 6.6 ml.
Example 3
The embodiment discloses a pretreatment method before reinjection of high-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. 2.5% of xanthan gum;
2. a span 805%;
3. 30% of oil-containing rock debris;
in this example, when the volume of the slurry preparation water is mL, the mass of the xanthan gum, the span 80 and the oil-containing rock debris is g.
The concrete preparation method of the grouting slurry comprises the following steps: adding the slurry preparation water into a slurry preparation container, then sequentially adding xanthan gum and span 80 according to the proportion, finally adding the oil-containing rock debris, and fully stirring for 2 hours.
The performance indexes of the back grouting of the embodiment are as follows:
apparent viscosity: shear rate of 170s-1The apparent viscosity was 135mPa.s and the shear rate was 1022s-1The apparent viscosity is 52 mPa.s;
the particle size of the drill cuttings: 150-180 μm;
funnel viscosity: 123 s;
suspension stability: standing at 120 deg.C for 24 hr to settle down with density difference of 0.02g/cm3(ii) a Standing at 120 deg.C for 48 hr to settle down with density difference of 0.04g/cm3；
API fluid loss: 2.4 ml.
Example 4
The embodiment discloses a pretreatment method before reinjection of high-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. 2% of xanthan gum;
2. span 803%;
3. 20% of oil-containing rock debris;
in this example, when the volume of the slurry preparation water is mL, the mass of the xanthan gum, the span 80 and the oil-containing rock debris is g.
The concrete preparation method of the grouting slurry comprises the following steps: adding the slurry preparation water into the slurry preparation container, then sequentially adding xanthan gum and span 80 according to the proportion, finally adding the oil-containing rock debris, and fully stirring for 1.5 h.
The performance indexes of the back grouting of 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: 78 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 0.06g/cm3；
API fluid loss: 3.2 ml.
Example 5
The embodiment discloses a pretreatment method before reinjection of high-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. 2.5% of xanthan gum;
2. tween 805%;
3. 30% of oil-containing rock debris;
in this example, when the volume of the slurry preparation water is mL, the mass of the xanthan gum, tween 80 and the oil-containing rock debris is g.
The concrete preparation method of the grouting slurry comprises the following steps: adding the prepared slurry water into a slurry preparation container, sequentially adding xanthan gum and tween 80 according to the proportion, finally adding the oil-containing rock debris, and fully stirring for 2 hours.
The performance indexes of the back grouting of the embodiment are as follows:
apparent viscosity: shear rate of 170s-1When the viscosity is 140mPa.s, the shear rate is 1022s-1An apparent viscosity of 53 mpa.s;
the particle size of the drill cuttings: 150-180 μm;
funnel viscosity: 120s/946 ml;
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: 3.2 ml.
Example 6
The embodiment discloses a pretreatment method before reinjection of high-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. 2.5 percent of guar gum;
2. tween 805%;
3. 30% of oil-containing rock debris;
in this example, when the volume of the slurrying water is mL, the mass of the guar gum, tween 80, and the oil-containing rock debris is g.
The concrete preparation method of the grouting slurry comprises the following steps: adding prepared slurry water into a slurry preparation container, sequentially adding guar gum and tween 80 according to a certain proportion, finally adding oil-containing rock debris, and fully stirring for 2 h.
The performance indexes of the back grouting of the embodiment are as follows:
apparent viscosity: shear rate of 170s-1When the viscosity is 134mPa.s, the shear rate is 1022s-1The apparent viscosity is 48 mPa.s;
the particle size of the drill cuttings: 150-180 μm;
funnel viscosity: 114s/946 ml;
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: 3.4 ml.
Example 7
The embodiment discloses a pretreatment method before reinjection of high-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. 2.5 percent of guar gum;
2. tween 805%;
3. 30% of oil-containing rock debris;
in this example, when the volume of the slurrying water is mL, the mass of the guar gum, tween 80, and the oil-containing rock debris is g.
The concrete preparation method of the grouting slurry comprises the following steps: adding prepared slurry water into a slurry preparation container, sequentially adding guar gum and tween 80 according to a certain proportion, finally adding oil-containing rock debris, and fully stirring for 2 h.
The performance indexes of the back grouting of the embodiment are as follows:
apparent viscosity: shear rate of 170s-1When the viscosity is 134mPa.s, the shear rate is 1022s-1The apparent viscosity is 48 mPa.s;
the particle size of the drill cuttings: 150-180 μm;
funnel viscosity: 114s/946 ml;
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: 3.4 ml.
Comparative example 1
Compared with the embodiment 1, the comparative example reduces the dosage of the surfactant, 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. 0.5% of xanthan gum;
2. span 800.2%;
3. 10% of oil-containing rock debris;
in this comparative example, the mass of xanthan gum, span 80, and oil-containing rock debris was g when the volume of slurry was mL.
The concrete preparation method of the slip-back slurry is the same as that of example 1.
The performance indexes are as follows:
apparent viscosity: shear rate of 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 to 180 μm
Funnel viscosity: 72s
Suspension stability: standing at 120 deg.C for 24 hr to settle down with density difference of 0.08g/cm3(ii) a Standing at 120 deg.C for 48 hr to settle down with density difference of 0.12g/cm3
API fluid loss: 6.8ml
The experimental results show that: when the addition amount of the surfactant is insufficient, the formed emulsion system has poor stability and poor suspension capability.
Comparative example 2
Compared with the embodiment 3, the dosage of the surfactant is increased, 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. 2.5% of xanthan gum;
2. span 806%;
3. 30% of oil-containing rock debris;
in this comparative example, the mass of xanthan gum, span 80, and oil-containing rock debris was g when the volume of slurry was mL.
The concrete formulation method of the slip-back slurry is the same as that of example 3.
The performance indexes are as follows:
apparent viscosity: shear rate of 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: 72 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 0.09g/cm3；
API fluid loss: 6.8 ml.
The experimental results show that: excess surfactant causes an onset and an unstable emulsion system can form.
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 pretreatment method before reinjection of high-oil-content rock debris by using a depleted well is characterized in that the oil-content 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 and a surfactant to prepare reinjection slurry.
2. The pretreatment method for the reinjection of the high-oil-content rock debris 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: 0.5 to 2.5 percent of suspending agent, 0.5 to 5 percent of surfactant and 10 to 30 percent of high oil-bearing rock debris; when the volume is mL, the mass is g.
3. The pretreatment method before reinjection of high oil content rock debris by using the depleted well according to claim 1 or 2, characterized in that the slurrying water is selected from any one or more of tap water, river and lake water and gas field water.
4. The pretreatment method for the high oil content rock debris 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 pretreatment method before reinjection of high oil content rock debris into a depleted well according to claim 1 or 2, wherein the surfactant is any one or more selected from nonylphenol polyoxyethylene ether, span 80 and tween 80.
6. The pretreatment method for the reinjection of the high-oil-content rock debris by using the depleted well as defined in claim 1 or 2, wherein the high-oil-content rock debris is ground into fine powder with the particle size of 150-180 μm.
7. The pretreatment method before reinjection of high-oil-content rock debris by using the depleted well according to claim 1 or 2, characterized in that the concrete preparation method of the reinjection slurry is as follows: adding slurry preparation water into a slurry preparation container, then sequentially adding a suspending agent and a surfactant according to a proportion, finally adding high-oil-content rock debris, and fully stirring.
8. The method for pretreating high-oil-content rock debris before reinjection into depleted wells according to 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.
9. The pretreatment method before reinjection of high-oil-content rock debris for 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.
10. The method for pretreating high-oil-content rock debris before reinjection by using depleted wells according to claim 6, wherein the suspension stability of the reinjection slurry 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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