CN112195017A - Plugging agent, preparation method and application thereof in well drilling plugging - Google Patents
Plugging agent, preparation method and application thereof in well drilling plugging Download PDFInfo
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- CN112195017A CN112195017A CN202011080672.XA CN202011080672A CN112195017A CN 112195017 A CN112195017 A CN 112195017A CN 202011080672 A CN202011080672 A CN 202011080672A CN 112195017 A CN112195017 A CN 112195017A
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- plugging
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- plugging agent
- drilling
- sawdust
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- 238000005553 drilling Methods 0.000 title claims abstract description 48
- 238000002360 preparation method Methods 0.000 title abstract description 8
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 102
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 86
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 79
- 239000002657 fibrous material Substances 0.000 claims abstract description 42
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 38
- 239000000835 fiber Substances 0.000 claims abstract description 37
- 239000002245 particle Substances 0.000 claims abstract description 28
- 239000004115 Sodium Silicate Substances 0.000 claims abstract description 25
- 239000000440 bentonite Substances 0.000 claims abstract description 25
- 229910000278 bentonite Inorganic materials 0.000 claims abstract description 25
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims abstract description 25
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 25
- 229910052911 sodium silicate Inorganic materials 0.000 claims abstract description 25
- 239000011343 solid material Substances 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 18
- 235000012343 cottonseed oil Nutrition 0.000 claims abstract description 16
- 238000004519 manufacturing process Methods 0.000 claims abstract description 8
- 229920002678 cellulose Polymers 0.000 claims abstract description 3
- 239000001913 cellulose Substances 0.000 claims abstract description 3
- 239000010410 layer Substances 0.000 claims description 25
- 239000000203 mixture Substances 0.000 claims description 25
- 239000000843 powder Substances 0.000 claims description 23
- 239000012530 fluid Substances 0.000 claims description 16
- 241000196324 Embryophyta Species 0.000 claims description 15
- 238000001914 filtration Methods 0.000 claims description 15
- 239000010453 quartz Substances 0.000 claims description 13
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 13
- 230000008569 process Effects 0.000 claims description 11
- 239000004568 cement Substances 0.000 claims description 9
- 239000000084 colloidal system Substances 0.000 claims description 7
- 229920005610 lignin Polymers 0.000 claims description 7
- 241000209140 Triticum Species 0.000 claims description 6
- 235000021307 Triticum Nutrition 0.000 claims description 6
- 238000000498 ball milling Methods 0.000 claims description 6
- 239000002356 single layer Substances 0.000 claims description 6
- 239000010902 straw Substances 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 3
- 230000007246 mechanism Effects 0.000 claims description 3
- 239000000565 sealant Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 10
- 238000007711 solidification Methods 0.000 abstract description 6
- 230000008023 solidification Effects 0.000 abstract description 6
- 238000009826 distribution Methods 0.000 abstract description 2
- 229920000742 Cotton Polymers 0.000 description 12
- 239000003245 coal Substances 0.000 description 9
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 239000002981 blocking agent Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 239000011268 mixed slurry Substances 0.000 description 3
- 230000007935 neutral effect Effects 0.000 description 3
- 229940088417 precipitated calcium carbonate Drugs 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 238000012993 chemical processing Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 150000002484 inorganic compounds Chemical class 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 239000004579 marble Substances 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/46—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement
- C09K8/467—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement containing additives for specific purposes
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/426—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells for plugging
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/46—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
- E21B33/138—Plastering the borehole wall; Injecting into the formation
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/04—Hulls, shells or bark containing well drilling or treatment fluids
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/08—Fiber-containing well treatment fluids
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/18—Bridging agents, i.e. particles for temporarily filling the pores of a formation; Graded salts
Abstract
The application discloses plugging agent comprises hard solid material and fiber material, hard solid material includes following component and content: 48-60 parts of calcium carbonate, 10-22 parts of sodium silicate, 10 parts of bentonite, 12 parts of sodium hydroxide and 5 parts of cellulose according to the weight ratio; the particle size of any component is 75-330 μm; the fiber material comprises 12-36 parts of cottonseed hulls and 8-36 parts of sawdust, and the maximum fiber length of the cottonseed hulls and the sawdust is not more than 150 mu m; the invention also provides a preparation method and application for obtaining the plugging agent, and the method can select plugging while drilling and staged plugging according to different plugging layer conditions, and can adaptively adjust the component distribution ratio according to different geological conditions and requirements so as to achieve the double technical effects of plugging and protecting a production zone. The plugging agent has good plugging effect, high strength and short solidification period.
Description
Technical Field
The invention relates to the field of well drilling plugging materials, in particular to a high-strength and rapid plugging agent, and specifically relates to a plugging agent, a preparation method and an application thereof in well drilling plugging.
Background
Borehole loss is one of the most common and intractable complications in drilling projects. Many experts and scholars have been engaged in this research, and various treatment methods and measures have been developed so far, and accordingly, various plugging agents have been developed. The most convenient and the most common plugging method is to add some plugging materials based on the drilling fluid or convert the drilling fluid into gel or hydraulic materials, such as bridge plug plugging, cross-linking plugging, grouting plugging and the like. The plugging agent is mainly used for permanent plugging for smooth drilling, is only suitable for exploration and development of common gas mines and is not suitable for coal-bed gas wells needing reservoir protection.
Coalbed methane is a gas that is stored in the pores of coal rocks or other channels primarily by adsorption. The coal bed gas is developed from the ground, a good connecting channel is generated between a reservoir and a drill hole through well drilling, well completion and fracturing, and the reservoir pressure is reduced through drainage, so that the coal bed gas is smoothly pumped out. This requires that the drilling fluid and the plugging agent do not cause any damage to the producing zone during the drilling process. Early on, without realizing the importance of reservoir protection, with conventional drilling fluids, particularly plugging agents, it was found that the damage to the reservoir was particularly severe, some wells even lost gas production capacity, and severely plugged the porosity of the coal seam.
On the basis of widely collecting relevant data at home and abroad and researching and analyzing the advantages and the disadvantages of the existing plugging agent products, the plugging agent is developed by combining the special requirements of a coal-bed gas well according to the actual well leakage condition, the stratum condition and the leakage crack structure of a construction area on site. Through a large number of indoor experiments, the plugging agent has a good plugging effect and can bear larger pressure difference, more importantly, the plugging agent has excellent plugging property, has strong plugging property aiming at a lost-return leakage layer, and has high success rate.
Disclosure of Invention
In order to solve the problems that the project cannot be continuously constructed due to the well leakage problem in the coal bed gas drilling and plugging process of the existing plugging agent and the reservoir is damaged due to the adoption of permanent plugging of a coal bed gas producing layer, the application provides a brand-new plugging agent for replacing the plugging effect of the existing plugging agent in the coal gas drilling process, so that the plugging agent cannot cause damage to the producing layer and the coal bed gap and gas production capacity are kept. In order to obtain the high-quality plugging agent, the invention also provides a preparation method of the obtained plugging agent and application of the obtained plugging agent in well drilling plugging.
In order to achieve the purpose, the technical scheme adopted by the application is as follows:
a plugging agent consists of a hard solid material and a fiber material,
the hard solid material comprises the following components in percentage by weight: 48-60 parts of calcium carbonate, 10-22 parts of sodium silicate, 10 parts of bentonite, 12 parts of sodium hydroxide and 5 parts of cellulose according to the weight ratio; the particle size of any component is 75-330 μm;
the fiber material comprises 12-36 parts of cottonseed hulls and 8-36 parts of sawdust, and the maximum fiber length of the cottonseed hulls and the sawdust is not more than 150 mu m.
Preferably, the blocking agent also comprises 15-28 parts of quartz powder.
More preferably, the sawdust is replaced by wheat straw in the same weight ratio.
Preferably, the plugging agent further comprises 12-30 parts of cement.
The invention provides a preparation method for preparing the plugging agent, which comprises the following steps:
ST010 continuously exposing the commercially available or self-raising fiber material for not less than 24 hours or placing the commercially available or self-raising fiber material in an oven for layered baking, wherein the temperature of the oven is set to be 60-70 ℃, and the baking duration is 12 hours;
step ST020 the dried fiber material obtained in step ST010 is placed in 40% sodium hydroxide solution to be soaked for 150-180 minutes at normal temperature;
ST030 is to place the fiber material soaked by the sodium hydroxide solution in a dehydrator to dehydrate for 15min continuously under the centrifugal environment of 1200 r/min; repeating the drying step of the step ST010 to obtain the plant fiber with the total content of lignin and colloid not more than 3%;
step ST040 grinds the plant fiber obtained in step ST030, and filters the plant fiber, wherein the filtering is carried out by adopting a filtering sieve with the mesh aperture not more than 0.15 μm, and the filtering sieve is composed of three layers of mesh screens which are attached in parallel and staggered; the mesh screen positioned in the middle layer is connected with a driving mechanism with a cam for driving the mesh screen to reciprocate; taking plant fibers at the lower part of the filter screen for later use;
ST050 the step of placing a mixture containing calcium carbonate, sodium silicate, bentonite, sodium hydroxide and quartz powder into a ball mill according to the proportion, carrying out ball milling until the particle size is preset, then placing the ball-milled mixture into any single-layer mesh screen with the aperture of 330 mu m for filtering, taking the filtered lower-layer powder as a semi-finished hard solid material for later use, and continuing ball milling the upper-layer mixture until the particle size meets the requirement;
step ST060, placing the semi-finished hard solid material obtained in step ST050 in a single-layer mesh screen with the aperture of 75 μm for filtering, removing lower-layer powder, and taking upper-layer powder as a finished hard solid material;
step ST070 uniformly mixes the plant fiber obtained in step ST040 and step ST060 with the finished hard solid material to obtain the plugging agent.
The invention also provides the application of the plugging agent in efficient drilling plugging, when the plugging process is plugging while drilling, the plugging agent mixture with the viscosity of 42-49 is prepared by any one of the plugging agents in the claims 1-3 and the drilling fluid to be plugged while drilling;
when the plugging process is staged plugging, the plugging agent of claim 4 and the drilling fluid are blended into a plugging agent mixture with the viscosity of 57-60 for one-time plugging, and the wellhead is subjected to pressure holding, so that the plugging agent mixture enters a crack to bridge and plug.
Preferably, when plugging is carried out while drilling, plugging while drilling is carried out by adopting a plugging agent mixture prepared by the plugging agent and the drilling fluid according to claim 2 and having the viscosity of 48.
Preferably, when plugging is performed in stages, the plugging agent mixture with the viscosity of 60, which is prepared by the plugging agent and the drilling fluid in the claim 4, is used for plugging for one time, the pressure holding pressure of a wellhead is 2.5-3.5Mpa, and the pressure holding time is 20-30 min.
Advantageous effects
The invention can select the leakage stoppage while drilling and the staged leakage stoppage according to different leakage layer conditions, and can adaptively adjust the component distribution ratio according to different geological conditions and requirements so as to achieve the dual technical effects of leakage stoppage and production layer protection. The plugging agent has good plugging effect, high strength and short solidification period.
According to the preparation method of the plugging agent, the fiber material is treated by the sodium hydroxide, more than 95% of colloid and lignin can be removed, so that the fiber material can form a uniform and effective net structure in the curing process and the cured plugging agent, the anti-flowing performance of the plugging agent can be greatly improved, the cracks can be quickly plugged, the water vapor permeation is avoided, and a good plugging effect is achieved. Meanwhile, the plugging agent without containing cement is very suitable for coal bed gas exploitation wells, can simultaneously meet the effects of plugging and protecting a production zone, and avoids permanent damage to the production zone or a reservoir caused by the existing plugging agent containing a strong-setting component.
Detailed Description
In order to more clearly illustrate the present invention, the following will explain the detailed description of the blocking agent provided by the present invention, its method and application:
before the examples are explained, the properties of the main component calcium carbonate in the present invention will be briefly explained:
calcium carbonate (Caco3) is an inorganic compound commonly known as limestone, marble, and the like. Calcium carbonate is neutral, substantially insoluble in water, and soluble in hydrochloric acid. Light calcium carbonate is also known as precipitated calcium carbonate. White powder. No smell and no toxicity. Decomposing into calcium oxide and carbon dioxide at 825 deg.C. Dissolving in dilute acid to release carbon dioxide. The Chinese characters are light calcium carbonate, precipitated calcium carbonate, light calcium and precipitated calcium carbonate. The light calcium carbonate is prepared by a chemical processing method. It is called light calcium carbonate because its sedimentation volume (2.4-2.8mL/g) is larger than that of heavy calcium carbonate produced by mechanical method (1.1-1.9 mL/g). The calcium carbonate absorbs heat when meeting water and is solidified to form the bridge plug.
The sodium hydroxide (NaOH) is used for removing residual colloid and lignin in the fiber material, so that negative influence of the residual colloid or lignin on the subsequent solidification or storage process of the plugging agent is avoided; and simultaneously, the pH value of the final plugging agent is kept neutral or alkalescent all the time by offsetting the possible residual acidic substances in the plugging agent, so that the final plugging agent is mixed with wellhead slurry to keep neutral in practical application, and the negative influence of a lower pH value on the underground stratum is avoided.
Example 1:
the plugging agent consists of a hard solid material and a fiber material, wherein the hard solid material comprises the following components in percentage by weight: 48-60 parts of calcium carbonate, 10-22 parts of sodium silicate, 10 parts of bentonite and 12 parts of sodium hydroxide according to parts by weight; the particle size of any component is 75-330 μm; the fiber material comprises 12-36 parts of cottonseed hulls and 8-36 parts of sawdust, and the maximum fiber length of the cottonseed hulls and the sawdust is not more than 150 mu m.
Example 2:
the specific content of the blocking agent provided in this example is adjusted as follows based on the components of example 1: 48-60 parts of calcium carbonate, 10-22 parts of sodium silicate, 10 parts of bentonite, 0-12 parts of sodium hydroxide and 15-28 parts of quartz powder according to parts by weight; the particle size of any component is 75-1000 μm; the fiber material comprises 12-36 parts of cottonseed hulls and 8-36 parts of sawdust, and the maximum fiber length of the cottonseed hulls and the sawdust is not more than 150 mu m.
Example 3:
the plugging agent provided by the embodiment replaces the sawdust in the embodiment 1 or 2 with the wheat straw in the same weight ratio.
Example 4:
the specific content of the blocking agent provided in this example is adjusted as follows based on the components of example 1: 48-60 parts of calcium carbonate, 10-22 parts of sodium silicate, 10 parts of bentonite, 12 parts of sodium hydroxide, 15-28 parts of quartz powder and 12-30 parts of cement according to parts by weight; the particle size of any component is 75-330 μm; the fiber material comprises 12-36 parts of cottonseed hulls and 8-36 parts of sawdust, and the maximum fiber length of the cottonseed hulls and the sawdust is not more than 150 mu m.
The contents of the components in the above examples 1 to 4 were tested one by a controlled variable method to verify the plugging effect.
Experimental groups 1-1:
the formulation according to example 1 is specifically defined as follows: taking 35 parts of calcium carbonate with the particle size of 75 mu m, 20 parts of sodium silicate, 10 parts of bentonite and 12 parts of sodium hydroxide; a fibrous material having a maximum fiber length of more than 75 μm comprising 12 parts of cottonseed hulls and 36 parts of sawdust was mixed.
Experimental groups 1-2:
taking 40 parts of calcium carbonate with the particle size of 200 mu m, 20 parts of sodium silicate, 10 parts of bentonite and 12 parts of sodium hydroxide; a fibrous material having a maximum fiber length of more than 100 μm comprising 12 parts of cotton seed hulls and 36 parts of sawdust was mixed.
Experimental groups 1 to 3:
taking 48 parts of calcium carbonate with the particle size of 300 mu m, 18 parts of sodium silicate, 10 parts of bentonite and 12 parts of sodium hydroxide; a fibrous material having a maximum fiber length of more than 150 μm comprising 12 parts of cotton seed hulls and 36 parts of sawdust was mixed.
Experimental groups 1-4:
55 parts of calcium carbonate with the particle size of 90 mu m, 15 parts of sodium silicate, 10 parts of bentonite and 12 parts of sodium hydroxide are taken; a fibrous material having a maximum fiber length of more than 150 μm comprising 12 parts of cotton seed hulls and 36 parts of sawdust was mixed.
Experimental groups 1-5:
taking 60 parts of calcium carbonate with the particle size of 120 mu m, 20 parts of sodium silicate, 10 parts of bentonite and 12 parts of sodium hydroxide; a fibrous material having a maximum fiber length of more than 150 μm comprising 12 parts of cotton seed hulls and 36 parts of sawdust was mixed.
Experimental groups 1-6:
taking 65 parts of calcium carbonate with the particle size of 120 mu m, 22 parts of sodium silicate, 10 parts of bentonite and 12 parts of sodium hydroxide; a fibrous material having a maximum fiber length of more than 40 μm, comprising 12 parts of cotton seed hulls and 36 parts of sawdust, was mixed.
Experimental group 2-1:
taking 48 parts of calcium carbonate with the particle size of 100 mu m, 10 parts of sodium silicate, 10 parts of bentonite and 0 part of sodium hydroxide; a fibrous material having a maximum fiber length of more than 150 μm comprising 12 parts of cotton seed hulls and 36 parts of sawdust was mixed.
Experimental groups 2-2:
taking 48 parts of calcium carbonate with the particle size of 100 mu m, 20 parts of sodium silicate, 10 parts of bentonite and 2 parts of sodium hydroxide; a fibrous material having a maximum fiber length of more than 150 μm comprising 12 parts of cotton seed hulls and 36 parts of sawdust was mixed.
Experimental groups 2 to 3:
taking 48 parts of calcium carbonate with the particle size of 100 mu m, 20 parts of sodium silicate, 10 parts of bentonite and 12 parts of sodium hydroxide; a fibrous material having a maximum fiber length of more than 150 μm comprising 12 parts of cotton seed hulls and 36 parts of sawdust was mixed.
Experimental groups 2 to 4:
taking 48 parts of calcium carbonate with the particle size of 100 mu m, 20 parts of sodium silicate, 10 parts of bentonite and 20 parts of sodium hydroxide; a fibrous material having a maximum fiber length of more than 150 μm comprising 12 parts of cotton seed hulls and 36 parts of sawdust was mixed.
Experimental groups 2 to 5:
taking 48 parts of calcium carbonate with the particle size of 100 mu m, 20 parts of sodium silicate, 10 parts of bentonite, 12 parts of sodium hydroxide and 15 parts of quartz powder; a fibrous material having a maximum fiber length of more than 150 μm comprising 12 parts of cotton seed hulls and 36 parts of sawdust was mixed.
Experimental groups 2-6:
taking 48 parts of calcium carbonate with the particle size of 100 mu m, 20 parts of sodium silicate, 10 parts of bentonite, 12 parts of sodium hydroxide and 15 parts of quartz powder; a fibrous material having a maximum fiber length of more than 150 μm comprising 12 parts of cotton seed hulls and 36 parts of sawdust was mixed.
Experimental groups 2 to 7:
taking 48 parts of calcium carbonate with the particle size of 100 mu m, 20 parts of sodium silicate, 10 parts of bentonite, 12 parts of sodium hydroxide and 28 parts of quartz powder; a fibrous material having a maximum fiber length of more than 150 μm comprising 12 parts of cotton seed hulls and 36 parts of sawdust was mixed.
Experimental group 3-1:
taking 48 parts of calcium carbonate with the particle size of 100 mu m, 20 parts of sodium silicate, 10 parts of bentonite, 12 parts of sodium hydroxide and 28 parts of quartz powder; the fiber material with the maximum fiber length of more than 150 mu m is taken and mixed, and comprises 12 parts of cottonseed hulls and 36 parts of wheat straws.
Experimental group 4-1:
taking 48 parts of calcium carbonate with the particle size of 100 mu m, 20 parts of sodium silicate, 10 parts of bentonite, 12 parts of sodium hydroxide, 28 parts of quartz powder and 12 parts of cement; the fiber material with the maximum fiber length of more than 150 mu m is taken and mixed, and comprises 12 parts of cottonseed hulls and 36 parts of wheat straws.
Experimental groups 4-2:
taking 48 parts of calcium carbonate with the particle size of 100 mu m, 20 parts of sodium silicate, 10 parts of bentonite, 12 parts of sodium hydroxide, 28 parts of quartz powder and 30 parts of cement; the fiber material with the maximum fiber length of more than 150 mu m is taken and mixed, and comprises 12 parts of cottonseed hulls and 36 parts of wheat straws.
Respectively preparing the experimental group 1-1 to the experimental group 1-6, the experimental group 2-1 to the experimental group 2-7, the experimental group 3-1 and the experimental group 4-1 to the experimental group 4-2 with the drilling slurry to obtain plugging agent mixed slurry, wherein the viscosity range of the plugging agent mixed slurry prepared by the experimental group 4-1 to the experimental group 4-2 and the slurry is controlled to be 57-60; the viscosity range of the mixed slurry of the plugging agent prepared by other experimental groups is controlled to be 42-48. The viscosity is expressed in centistokes viscosity. Two samples from any of the above groups were taken for the set time and strength tests, and the average of the data from the same group of samples is shown in the following table:
TABLE 1
As can be seen from the above Table 1, in the same viscosity ratio of the experimental groups 1-1 to 1-6, as the content of calcium carbonate increases, the initial setting time and the final setting time are both gradually shortened, and simultaneously, the strength is also increased; the content ratio of the calcium carbonate in the plugging agent is directly related to the solidification time and the strength; however, the strength of the experimental groups 1 to 6 is abnormally reduced, and if 5 parts of calcium carbonate is added as compared with the experimental groups 1 to 5, the final strength is reduced by the strength of 3.41Mpa, which means that the calcium carbonate is not unlimited in improving the solidification efficiency and strength, and according to the component ratio provided by the experimental groups, an upper limit value of 60 parts exists, and if the calcium carbonate content is too high, the hardness is further increased, but the strength after solidification of the plugging agent is reduced. It should be noted that, for convenience of experiment, the addition of the mass parts is performed, and as a person skilled in the art can also simply convert the mass parts to obtain the content of each component in percentage, the content range obtained by unit conversion should also be directly regarded as the scope of the disclosure of the present invention without any meaning.
Example 5:
the invention provides a preparation method for preparing the plugging agent, which comprises the following steps:
ST010 continuously exposing the commercially available or self-raising fiber material for not less than 24 hours or placing the commercially available or self-raising fiber material in an oven for layered baking, wherein the temperature of the oven is set to 70 ℃, and the baking duration is 12 hours;
step ST020 soaking the dried fiber material obtained in step ST010 in 40% sodium hydroxide solution at normal temperature for 150 or 180 minutes;
ST030 is to place the fiber material soaked by the sodium hydroxide solution in a dehydrator to dehydrate for 15min continuously under the centrifugal environment of 1200 r/min; repeating the drying step of the step ST010 to obtain the plant fiber with the total content of lignin and colloid not more than 3%; the addition of the colloid and the lignin can bring direct negative influence on the plugging performance of the plugging agent, so that the plugging performance of the fiber material between the plugging agent and the initial setting is fully exerted.
Step ST040 grinds the plant fiber obtained in step ST030, and filters the plant fiber, wherein the filtering is carried out by adopting a filtering sieve with the mesh aperture not more than 0.15 μm, and the filtering sieve is composed of three layers of mesh screens which are attached in parallel and staggered; the mesh screen positioned in the middle layer is connected with a driving mechanism with a cam for driving the mesh screen to reciprocate; taking plant fibers at the lower part of the filter screen for later use;
ST050 the step of placing a mixture containing calcium carbonate, sodium silicate, bentonite, sodium hydroxide and quartz powder into a ball mill according to the proportion, carrying out ball milling until the particle size is preset, then placing the ball-milled mixture into any single-layer mesh screen with the aperture of 330 mu m for filtering, taking the filtered lower-layer powder as a semi-finished hard solid material for later use, and continuing ball milling the upper-layer mixture until the particle size meets the requirement;
step ST060, placing the semi-finished hard solid material obtained in step ST050 in a single-layer mesh screen with the aperture of 75 μm for filtering, removing lower-layer powder, and taking upper-layer powder as a finished hard solid material;
step ST070 uniformly mixes the plant fiber obtained in step ST040 and step ST060 with the finished hard solid material to obtain the plugging agent.
Example 6:
the invention also provides the application of the plugging agent in efficient drilling plugging, when the plugging process is plugging while drilling, any one of the plugging agents described in the embodiments 1-3 is blended with drilling fluid to prepare a plugging agent mixture with the viscosity of 42 for plugging while drilling;
when the plugging process is staged plugging, the plugging agent of claim 4 and the drilling fluid are blended into a plugging agent mixture with the viscosity of 60 for one-time plugging, and the wellhead is subjected to pressure holding, so that the plugging agent mixture enters a crack for plugging.
When plugging while drilling is adopted, plugging while drilling is carried out by adopting a plugging agent mixture with the viscosity of 48 prepared by the plugging agent and the drilling fluid in the embodiment 2.
When the staged plugging is adopted, the plugging agent mixture with the viscosity of 60, which is prepared by the plugging agent and the drilling fluid in the embodiment 4, is adopted for one-time plugging, the pressure building pressure of a wellhead is 2.5Mpa, and the pressure building time is 20-30 min. Particularly, for the lost-return leakage layer, the one-time leakage stoppage can be more effectively realized by adding the cement. The embodiment provides different application modes according to different leakage layer environments, and meanwhile, the plugging agent with different formulas is adopted in a targeted manner, so that the compatibility and the practicability of the plugging agent are wider, when the plugging while drilling is met, the plugging agent with any proportion has no cement cost, the root cause is to protect a reservoir stratum, and the reservoir stratum of the high-hardness permanently-plugged cement is prevented from causing irreversible damage, so that the porosity of a coal seam is seriously blocked, and the gas production capacity is lost underground.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (8)
1. A plugging agent characterized by: consists of a hard solid material and a fiber material,
the hard solid material comprises the following components in percentage by weight: 48-60 parts of calcium carbonate, 10-22 parts of sodium silicate, 10 parts of bentonite, 12 parts of sodium hydroxide and 5 parts of cellulose according to the weight ratio; the particle size of any component is 75-330 μm;
the fiber material comprises 12-36 parts of cottonseed hulls and 8-36 parts of sawdust, and the maximum fiber length of the cottonseed hulls and the sawdust is not more than 150 mu m.
2. The plugging agent according to claim 1, wherein: also comprises 15-28 parts of quartz powder.
3. The plugging agent according to claim 1, wherein: replacing the sawdust with wheat straw in the same weight ratio.
4. The plugging agent according to claim 1, wherein: also comprises 12 to 30 portions of cement.
5. A method of making the sealant according to any one of claims 1 to 4, wherein: the method comprises the following steps:
ST010 continuously exposing the commercially available or self-raising fiber material for not less than 24 hours or placing the commercially available or self-raising fiber material in an oven for layered baking, wherein the temperature of the oven is set to be 60-70 ℃, and the baking duration is 12 hours;
step ST020 the dried fiber material obtained in step ST010 is placed in 40% sodium hydroxide solution to be soaked for 150-180 minutes at normal temperature;
ST030 is to place the fiber material soaked by the sodium hydroxide solution in a dehydrator to dehydrate for 15min continuously under the centrifugal environment of 1200 r/min; repeating the drying step of the step ST010 to obtain the plant fiber with the total content of lignin and colloid not more than 3%;
step ST040 grinds the plant fiber obtained in step ST030, and filters the plant fiber, wherein the filtering is carried out by adopting a filtering sieve with the mesh aperture not more than 0.15 μm, and the filtering sieve is composed of three layers of mesh screens which are attached in parallel and staggered; the mesh screen positioned in the middle layer is connected with a driving mechanism with a cam for driving the mesh screen to reciprocate; taking plant fibers at the lower part of the filter screen for later use;
ST050 the step of placing a mixture containing calcium carbonate, sodium silicate, bentonite, sodium hydroxide and quartz powder into a ball mill according to the proportion, carrying out ball milling until the particle size is preset, then placing the ball-milled mixture into any single-layer mesh screen with the aperture of 330 mu m for filtering, taking the filtered lower-layer powder as a semi-finished hard solid material for later use, and continuing ball milling the upper-layer mixture until the particle size meets the requirement;
step ST060, placing the semi-finished hard solid material obtained in step ST050 in a single-layer mesh screen with the aperture of 75 μm for filtering, removing lower-layer powder, and taking upper-layer powder as a finished hard solid material;
step ST070 uniformly mixes the plant fiber obtained in step ST040 and step ST060 with the finished hard solid material to obtain the plugging agent.
6. The use of the plugging agent according to any one of claims 1 to 4 in high efficiency drilling plugging, wherein: when the plugging process is plugging while drilling, plugging while drilling by adopting a plugging agent mixture prepared by any one of the plugging agents of claims 1-3 and the drilling fluid and having the viscosity of 42-49;
when the plugging process is staged plugging, the plugging agent of claim 4 and the drilling fluid are blended into a plugging agent mixture with the viscosity of 57-60 for one-time plugging, and the wellhead is subjected to pressure holding, so that the plugging agent mixture enters a crack to bridge and plug.
7. The use of the plugging agent of claim 6 in high efficiency drilling plugging, wherein: when plugging is carried out while drilling, the plugging agent of claim 2 and the drilling fluid are blended into a plugging agent mixture with the viscosity of 48 for plugging while drilling.
8. The use of the plugging agent of claim 6 in high efficiency drilling plugging, wherein: when plugging is performed in stages, the plugging agent of claim 4 and drilling fluid are blended into a plugging agent mixture with the viscosity of 60 to perform one-time plugging, the pressure building pressure of a wellhead is 2.5-3.5Mpa, and the pressure building time is 20-30 min.
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Application publication date: 20210108 |