CN107955589B - Cellulose nanofiber and clay-phase-free water-based drilling fluid containing cellulose nanofiber - Google Patents
Cellulose nanofiber and clay-phase-free water-based drilling fluid containing cellulose nanofiber Download PDFInfo
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- CN107955589B CN107955589B CN201711091987.2A CN201711091987A CN107955589B CN 107955589 B CN107955589 B CN 107955589B CN 201711091987 A CN201711091987 A CN 201711091987A CN 107955589 B CN107955589 B CN 107955589B
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/04—Aqueous well-drilling compositions
- C09K8/06—Clay-free compositions
- C09K8/08—Clay-free compositions containing natural organic compounds, e.g. polysaccharides, or derivatives thereof
- C09K8/10—Cellulose or derivatives thereof
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- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/04—Aqueous well-drilling compositions
- C09K8/06—Clay-free compositions
- C09K8/12—Clay-free compositions containing synthetic organic macromolecular compounds or their precursors
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/08—Fiber-containing well treatment fluids
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- 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
- C09K2208/34—Lubricant additives
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Abstract
The invention relates to cellulose nano-fiber and clay-phase-free water-based drilling fluid containing the same. The technical scheme is as follows: comprises cellulose nano-fiber, a filtrate reducer, a shale inhibitor, a lubricant, a high-temperature stabilizer, water and a weighting material; the volume of 1L of water is taken as a reference, and the content of the cellulose nano-fiber is 1 to 30g; the content of the filtrate reducer is 20 to 40g; the content of the shale inhibitor is 10 to 30g; the content of the high-temperature stabilizer is 1-10g; the content of the lubricant is 20 to 30g; the content of the weighting material in each liter of clay-free phase water-based drilling fluid is 100 to 2000g. The beneficial effects are that: the invention has good and stable rheological property under the conditions before and after aging at the high temperature of 180 ℃, the dynamic-plastic ratio reaches more than 0.5, the drilling fluid has strong shearing dilutability and thixotropy, has the characteristic of 'quick weak gel', and is beneficial to improving the rock carrying efficiency of the drilling fluid in the drilling process of extended reach wells and horizontal wells.
Description
Technical Field
The invention relates to the field of drilling fluid in the petroleum and natural gas industry, in particular to cellulose nanofiber and clay-phase-free water-based drilling fluid containing the cellulose nanofiber.
Background
As is known, the oil-based drilling fluid has the advantages of strong inhibition, excellent lubricity, high-temperature stability, reservoir protection and the like, but increasingly strict environmental requirements, high cost and the like limit the popularization and application of the oil-based drilling fluid. The high-performance water-based drilling fluid is a novel water-based drilling fluid system type developed in recent years, has the comprehensive performance equivalent to that of an oil-based drilling fluid, can more comprehensively meet the technical requirements of collapse prevention, mud pocket prevention and blockage prevention of a complex well drilling fluid, is beneficial to improving the drilling speed, and meets the technical requirements of environmental protection, oil conservation, cost reduction and the like.
At present, clay is usually used as a base material for regulating and controlling the performance of drilling fluid in high-performance water-based drilling fluid, and a large amount of submicron clay particles in the drilling fluid can invade into a reservoir to cause solid-phase blockage, so that irreversible reservoir damage is caused. The clay-phase-free high-performance water-based drilling fluid can avoid reservoir damage caused by clay particles and is beneficial to improving the drilling speed of drilling. Wherein, the tackifying and cutting agent is a key processing agent for adjusting and controlling the rheological property of the clay-free phase high-performance water-based drilling fluid. The conventional drilling fluid tackifying and cutting-improving agent is a biopolymer and a synthetic polymer, wherein the biopolymer has good tackifying and cutting-improving performance, but poor temperature resistance, can be oxidized, degraded and failed when the temperature exceeds 120 ℃, and the synthetic polymer has poor shear dilution performance, low dynamic-plastic ratio and high cost and cannot meet the environmental protection requirement.
The cellulose nano-fiber is a renewable, nontoxic and low-cost natural polymer material, has the excellent characteristics of high strength, high modulus, small thermal expansion coefficient, good high-temperature stability and the like compared with the traditional cellulose material, and has wide raw material sources and simple preparation process. The cellulose nano-fiber can be well dispersed in the aqueous solution, effectively improves the viscosity and the shearing force of the aqueous solution, and has wide application prospect in the aspect of clay-free phase high-performance water-based drilling fluid treating agent.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide the cellulose nanofiber and the clay-phase-free water-based drilling fluid containing the cellulose nanofiber, wherein the cellulose nanofiber is added to improve the viscosity and the dynamic shear force of the clay-phase-free water-based drilling fluid and enhance the shear thinning property and the thixotropy of a drilling fluid system.
The invention provides cellulose nano-fiber and clay-phase-free water-based drilling fluid containing the same, and the technical scheme is as follows: comprises cellulose nano-fiber, a filtrate reducer, a shale inhibitor, a lubricant, a high-temperature stabilizer, water and a weighting material; based on the volume of 1L of water, the content of the cellulose nano-fiber is 1-30 g; the content of the filtrate reducer is 20-40 g; the content of the shale inhibitor is 10-30 g; the content of the high-temperature stabilizer is 1-10 g; the content of the lubricant is 20-30 g; the content of the weighting material in each liter of the clay-phase-free water-based drilling fluid is 100-2000 g.
Preferably, the cellulose nanofibers have a microscopic morphology of a fibril shape, an average diameter of 2 to 50nm, and an aspect ratio of 100 to 1000.
Preferably, the cellulose nanofibers are carboxymethyl cellulose nanofibers, cationic cellulose nanofibers, hydroxyethyl cellulose nanofibers, hydroxypropyl cellulose nanofibers, or polyanionic cellulose fibers.
Preferably, the preparation method of the cellulose nanofiber comprises the following steps:
preparing raw materials of cellulose nano-fibers into modified cellulose aqueous dispersion with the volume percentage concentration of 1-100 g/L, repeatedly treating the cellulose or the modified cellulose aqueous dispersion for 1-20 times by using a dynamic ultrahigh-pressure micro-jet machine under the homogenization pressure of 60-180 MPa, and performing solid-liquid separation, drying and drying on the obtained product to obtain the cellulose nano-fibers.
Preferably, the fluid loss additive is carboxymethyl starch, high temperature resistant starch, polyacrylonitrile ammonium salt, sulfomethyl lignite or sulfomethyl phenolic resin.
Preferably, the shale inhibitor is polyether amine, alkylamine, amino silanol, potassium humate or potassium chloride.
Preferably, the lubricant is a polymeric alcohol, white oil or graphite.
Preferably, the high-temperature stabilizer is thiourea, citric acid, polyethylene glycol, VC sodium salt or sodium sulfite.
Preferably, the weighting material is calcium carbonate powder and barite powder which are mixed in any ratio.
The invention has the beneficial effects that: according to the invention, cellulose nanofibers are added into a water-based drilling fluid system as a tackifying and cutting agent for the drilling fluid, cellulose chains are mutually wound to form a three-dimensional reticular space grid structure, so that the purpose of tackifying and cutting is achieved, meanwhile, the space grid structure is extremely easy to damage under the action of external force, and can be recovered again after the external force is removed, so that the space grid structure has the characteristic of quick weak gel, and is beneficial to enhancing the shear thinning property and thixotropy of the drilling fluid system, thereby effectively regulating and controlling the rheological property of the drilling fluid system;
the clay-phase-free water-based drilling fluid provided by the invention has good and stable rheological property under the conditions of high temperature of 180 ℃ before and after aging, the dynamic-plastic ratio reaches more than 0.5, the drilling fluid has strong shearing dilutability and thixotropy, has the characteristics of 'quick weak gel', and is beneficial to improving the rock carrying efficiency of the drilling fluid in the drilling process of extended reach wells and horizontal wells;
the invention not only has good tackifying and shear-improving performances of the drilling fluid, but also has the advantages of reproducibility, no toxicity, degradability, low cost and the like.
Detailed Description
The invention will be further described with reference to the following examples:
in the embodiment 1, the cellulose nano-fiber and the clay-phase-free water-based drilling fluid containing the cellulose nano-fiber are prepared by the following technical scheme:
preparing 1 wt% of carboxymethyl cellulose aqueous dispersion from carboxymethyl cellulose, repeatedly treating the carboxymethyl cellulose aqueous dispersion for 8 times by using a dynamic ultrahigh-pressure microjet machine under the action of homogenizing pressure of 140MPa, centrifuging the obtained product for 2 min at 12000r/min, and drying the product for 6h at 80 ℃ to obtain carboxymethyl cellulose nano-fiber CNF-1, wherein the average diameter of the nano-fiber CNF-1 is 21nm, and the length-diameter ratio of the nano-fiber CNF-1 is 335.
The content of the carboxymethyl cellulose nano-fiber CNF-1 is 2g by taking the volume of 400ml of water as a reference; the content of the filtrate reducer is 12g; the content of the shale inhibitor is 6g; the content of the high-temperature stabilizer is 8g; the content of the lubricant is 0.5g; the content of the weighting material in each liter of the clay-phase-free water-based drilling fluid is 100g;
the filtrate reducer is temperature-resistant starch, the shale inhibitor is amino silanol, the lubricant is polymeric alcohol, the high-temperature stabilizer is VC sodium salt, and the weighting material is prepared from the following components in a volume ratio of 1.2:1 calcium carbonate powder and barite powder.
Example 2
Preparing 3-wt% of cationic cellulose into aqueous dispersion, repeatedly treating the cationic cellulose aqueous dispersion for 10 times by using a dynamic ultrahigh-pressure microjet machine under the action of homogenizing pressure of 120MPa, centrifuging the obtained product for 30min at 11000r/min, and drying for 4h at 100 ℃ to obtain cationic cellulose nanofiber CNF-2, wherein the average diameter of the obtained product is 13nm, and the length-diameter ratio of the obtained product is 458;
the content of the cationic cellulose nanofiber CNF-2 is 2g based on the volume of 400ml of water; the content of the filtrate reducer is 12g; the content of the shale inhibitor is 6g; the content of the high-temperature stabilizer is 8g; the content of the lubricant is 0.5g; the content of the weighting material in each liter of the clay-phase-free water-based drilling fluid is 100g;
the filtrate reducer is temperature-resistant starch, the shale inhibitor is amino silanol, the lubricant is polyalcohol, the high-temperature stabilizer is VC sodium salt, and the weight-increasing material is a mixture of weight-increasing materials in a volume ratio of 1.2:1 calcium carbonate powder and barite powder.
Example 3
Preparing 2 wt% of aqueous dispersion of hydroxyethyl cellulose, repeatedly treating the aqueous dispersion of hydroxyethyl cellulose by using a dynamic ultrahigh pressure microjet machine for 6 times under the action of homogenizing pressure of 160MPa, centrifuging the obtained product at 12000r/min for 20min, and drying at 100 ℃ for 5h to obtain the hydroxyethyl cellulose nanofiber CNF-3, wherein the average diameter of the hydroxyethyl cellulose nanofiber CNF-3 is 28nm, and the length-diameter ratio of the hydroxyethyl cellulose nanofiber is 275.
The content of the hydroxyethyl cellulose nanofiber CNF-3 is 2g by taking the volume of 400ml of water as a reference; the content of the filtrate reducer is 12g; the content of the shale inhibitor is 6g; the content of the high-temperature stabilizer is 8g; the content of the lubricant is 0.5g; the content of the weighting material in each liter of the clay-phase-free water-based drilling fluid is 100g;
the filtrate reducer is temperature-resistant starch, the shale inhibitor is amino silanol, the lubricant is polymeric alcohol, the high-temperature stabilizer is VC sodium salt, and the weighting material is prepared from the following components in a volume ratio of 1.2:1 calcium carbonate powder and barite powder.
Example 4
Preparing 2-wt% of water dispersion liquid from hydroxypropyl cellulose, repeatedly treating the water dispersion liquid of the hydroxyethyl cellulose for 20 times by using a dynamic ultrahigh-pressure microjet machine under the action of homogeneous pressure of 60MPa, centrifuging the obtained product for 20min at 12000r/min, and drying the product for 5h at 100 ℃ to obtain the hydroxypropyl cellulose nanofiber CNF-4, wherein the average diameter of the obtained hydroxypropyl cellulose nanofiber CNF-4 is 20nm, and the length-diameter ratio of the obtained hydroxypropyl cellulose nanofiber CNF-4 is 575.
The content of the hydroxypropyl cellulose nano-fiber CNF-4 is 1g by taking the volume of 1L of water as a reference; the content of the filtrate reducer is 20g; the content of the shale inhibitor is 10g; the content of the high-temperature stabilizer is 1g; the content of the lubricant is 20g; the content of the weighting material in each liter of the clay-phase-free water-based drilling fluid is 1200g;
the fluid loss additive is sulfomethyllignite, the shale inhibitor is potassium humate, the lubricant is white oil, the high-temperature stabilizer is sodium sulfite, and the weighting materials are mixed according to a volume ratio of 3:2 calcium carbonate powder and barite powder.
Example 5
Preparing 2-wt% of aqueous dispersion of polyanionic cellulose, repeatedly treating the hydroxyethyl cellulose aqueous dispersion by using a dynamic ultrahigh-pressure microjet machine for 16 times under the action of homogenizing pressure of 180MPa, centrifuging the obtained product at 12000r/min for 20min, and drying the product at 100 ℃ for 5h to obtain the polyanionic cellulose nanofiber CNF-5, wherein the average diameter of the polyanionic cellulose nanofiber CNF-5 is measured to be 12nm, and the length-diameter ratio of the polyanionic cellulose nanofiber CNF-5 is measured to be 385.
The content of the polyanionic cellulose nanofiber CNF-5 is 20g by taking the volume of 1L of water as a reference; the content of the filtrate reducer is 20g; the content of the shale inhibitor is 28g; the content of the high-temperature stabilizer is 6g; the content of the lubricant is 25g; the content of the weighting material in each liter of the clay-phase-free water-based drilling fluid is 900g;
the filtrate reducer is potassium chloride, the shale inhibitor is amino silanol, the lubricant is polyalcohol, the high-temperature stabilizer is VC sodium salt, and the weighting material is prepared from (by volume ratio) 3:7 calcium carbonate powder and barite powder.
In the embodiment 6, the cellulose nanofiber and the clay-phase-free water-based drilling fluid containing the cellulose nanofiber are characterized in that:
preparing 1 wt% of carboxymethyl cellulose aqueous dispersion from carboxymethyl cellulose, repeatedly treating the carboxymethyl cellulose aqueous dispersion for 8 times by using a dynamic ultrahigh-pressure microjet machine under the action of homogenizing pressure of 140MPa, centrifuging the obtained product for 2 min at 12000r/min, and drying the product for 6h at 80 ℃ to obtain carboxymethyl cellulose nano-fiber CNF-1, wherein the average diameter of the nano-fiber CNF-1 is 21nm, and the length-diameter ratio of the nano-fiber CNF-1 is 335.
The content of the carboxymethyl cellulose nanofiber CNF-1 is 30g by taking the volume of 1L of water as a reference; the content of the filtrate reducer is 40g; the content of the shale inhibitor is 30g; the content of the high-temperature stabilizer is 10g; the content of the lubricant is 30g; the content of the weighting material in each liter of the clay-phase-free water-based drilling fluid is 2000g;
the fluid loss additive is carboxymethyl starch, the shale inhibitor is polyetheramine, the lubricant is polyalcohol, the high-temperature stabilizer is thiourea, and the weight-increasing material is prepared from the following components in a volume ratio of 1:1 calcium carbonate powder and barite powder.
Example 7
Preparing 3-wt% of cationic cellulose into aqueous dispersion, repeatedly treating the cationic cellulose aqueous dispersion for 10 times by using a dynamic ultrahigh-pressure microjet machine under the action of homogenizing pressure of 120MPa, centrifuging the obtained product for 30min at 11000r/min, and drying for 4h at 100 ℃ to obtain cationic cellulose nanofiber CNF-2, wherein the average diameter of the obtained product is 13nm, and the length-diameter ratio of the obtained product is 458;
the content of the cationic cellulose nanofiber CNF-2 is 15g by taking the volume of 1L of water as a reference; the content of the filtrate reducer is 25g; the content of the shale inhibitor is 20g; the content of the high-temperature stabilizer is 5g; the content of the lubricant is 25g; the content of the weighting material in each liter of the clay-phase-free water-based drilling fluid is 800g;
the filtrate reducer is high-temperature resistant starch, the shale inhibitor is alkylamine, the lubricant is white oil, the high-temperature stabilizer is citric acid, and the weight-increasing materials are mixed in a volume ratio of 1:2 calcium carbonate powder and barite powder.
Example 8
Preparing 2 wt% of aqueous dispersion of hydroxyethyl cellulose, repeatedly treating the aqueous dispersion of hydroxyethyl cellulose by using a dynamic ultrahigh pressure microjet machine for 6 times under the action of homogenizing pressure of 160MPa, centrifuging the obtained product at 12000r/min for 20min, and drying at 100 ℃ for 5h to obtain the hydroxyethyl cellulose nanofiber CNF-3, wherein the average diameter of the hydroxyethyl cellulose nanofiber CNF-3 is 28nm, and the length-diameter ratio of the hydroxyethyl cellulose nanofiber is 275.
The content of the hydroxyethyl cellulose nanofiber CNF-3 is 10g by taking the volume of 1L of water as a reference; the content of the filtrate reducer is 30g; the content of the shale inhibitor is 28g; the content of the high-temperature stabilizer is 6g; the content of the lubricant is 20g; the content of the weighting material in each liter of the clay-phase-free water-based drilling fluid is 100g;
the filtrate reducer is polyacrylonitrile ammonium salt, the shale inhibitor is amino silanol, the lubricant is graphite, the high-temperature stabilizer is polyethylene glycol, and the weighting material is a mixture of (by volume ratio) 3:1 calcium carbonate powder and barite powder.
The cellulose nano-fiber is used for preparing the clay-phase-free water-based drilling fluid, and the specific formula is shown in examples 1-7. Referring to the water-based drilling fluid field test procedure (GB/T16783-1997), the rheological property and the fluid loss property of the drilling fluid before and after aging at the high temperature of 180 ℃ are tested by using a six-speed viscometer and a medium pressure fluid loss filter, and the test results are shown in Table 1.
Analysis table 1 shows that the clay-phase-free water-based drilling fluid containing cellulose nanofibers, provided by the invention, has good and stable rheological fluid loss performance, good high-temperature resistance, a dynamic-plastic ratio of the drilling fluid of more than 0.5, and strong shear thinning property and thixotropy before and after aging at a high temperature of 180 ℃. The cellulose nanofiber provided by the invention is added into the clay-phase-free water-based drilling fluid as a tackifying and shear-improving agent for the drilling fluid, so that the drilling fluid has an obvious tackifying and shear-improving effect, has the characteristic of quick weak gelation, and can effectively regulate and control the rheological property of the clay-phase-free water-based drilling fluid.
TABLE 1 results of rheological fluid loss property test of drilling fluids
Note: AV is the apparent viscosity of the drilling fluid; PV is the drilling fluid plastic viscosity; YP is drilling fluid cutting force; API is the amount of lost water under pressure in the drilling fluid.
The invention is not restricted to the details of the preferred embodiments described above, but within the scope of the technical idea of the invention many simple variations of the technical solution of the invention are possible. Any modification, equivalent replacement or improvement made within the spirit and principle of the present invention should be recognized as the same as the present invention.
Claims (1)
1. A clay-phase-free water-based drilling fluid comprising cellulose nanofibers, characterized by: comprises cellulose nano-fiber, a filtrate reducer, a shale inhibitor, a lubricant, a high-temperature stabilizer, water and a weighting material; the volume of 1L of water is taken as a reference, and the content of the cellulose nano-fiber is 1 to 30g; the content of the filtrate reducer is 20 to 40g; the content of the shale inhibitor is 10 to 30g; the content of the high-temperature stabilizer is 1-10g; the content of the lubricant is 20 to 30g; the content of the weighting material in each liter of clay-free phase water-based drilling fluid is 100 to 2000g; the cellulose nano-fiber is in a filament shape in microscopic form, the average diameter of the cellulose nano-fiber is 2 to 50nm, and the length-diameter ratio of the cellulose nano-fiber is 100 to 1000; the cellulose nano-fiber is carboxymethyl cellulose nano-fiber, cationic cellulose nano-fiber, hydroxyethyl cellulose nano-fiber, hydroxypropyl cellulose nano-fiber or polyanion cellulose fiber; the shale inhibitor is polyether amine, alkylamine, amino silanol, potassium humate or potassium chloride; the lubricant is polymeric alcohol, white oil or graphite; the high-temperature stabilizer is thiourea, citric acid, polyethylene glycol, VC sodium salt or sodium sulfite; the weighting material is calcium carbonate powder and barite powder which are mixed in any ratio; the fluid loss additive is carboxymethyl starch, high-temperature resistant starch, polyacrylonitrile ammonium salt, sulfomethyl lignite or sulfomethyl phenolic resin; the preparation method of the cellulose nanofiber comprises the following steps: preparing a raw material of cellulose nanofiber into a modified cellulose aqueous dispersion with the volume percentage concentration of 1-100g/L, repeatedly treating the cellulose or the modified cellulose aqueous dispersion for 1-20 times by using a dynamic ultrahigh pressure micro-jet machine under the homogenization pressure of 60-180MPa, and performing solid-liquid separation, drying and drying on the obtained product to obtain the cellulose nanofiber.
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| CN110746946A (en) * | 2018-07-24 | 2020-02-04 | 中石化石油工程技术服务有限公司 | Water-based drilling fluid based on cellulose nanofibrils |
| CN110330954B (en) * | 2019-05-27 | 2021-10-08 | 天津市木精灵生物科技有限公司 | Cellulose nanofiber-based high-temperature high-salt filtrate reducer and preparation method thereof |
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