CN112159648A - Preparation method of drilling fluid filtrate reducer - Google Patents
Preparation method of drilling fluid filtrate reducer Download PDFInfo
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- CN112159648A CN112159648A CN202010925677.1A CN202010925677A CN112159648A CN 112159648 A CN112159648 A CN 112159648A CN 202010925677 A CN202010925677 A CN 202010925677A CN 112159648 A CN112159648 A CN 112159648A
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- cellulose
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- drilling fluid
- polyvinyl alcohol
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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
- C09K8/03—Specific additives for general use in well-drilling compositions
- C09K8/035—Organic additives
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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
- C09K8/03—Specific additives for general use in well-drilling compositions
- C09K8/032—Inorganic additives
Abstract
The invention discloses a preparation method of a drilling fluid filtrate reducer, which comprises the following steps: (1) crushing fiber raw materials of agricultural and forestry wastes, preparing cellulose pulp, adding an organic acid solution and a strong oxidant solution into the cellulose pulp, reacting at 35-70 ℃ for 12-24h, then carrying out suction filtration, washing with distilled water to be neutral, drying, and then ultrasonically dispersing the dried material into water to prepare nano-cellulose suspension; (2) and fully mixing the nano cellulose suspension, polyvinyl alcohol and bentonite to prepare the fluid loss additive for drilling fluid. The invention adopts cellulose pulp to prepare nano-cellulose and mixes the nano-cellulose with polyvinyl alcohol and bentonite to form a target product, the preparation method is simple, the yield is high, the cost is low, and the prepared drilling fluid filtrate reducer can achieve the temperature resistance and the salt resistance under the condition of low usage amount.
Description
Technical Field
The invention belongs to the technical field of oilfield chemical drilling fluid treatment, and particularly relates to a preparation method of a drilling fluid filtrate reducer.
Background
With the shortage of petroleum resources and the increasing demand of human beings for energy, the development of oil and gas in deep wells and ultra-deep wells is inevitable. However, because the temperature and pressure in the deep well and the ultra-deep well are high, the stratum structure is complex, high-pressure oil-gas layers and brine layers are frequently encountered in the drilling process, and the technical problems that the drilling fluid performance is unstable and the filtration loss is too high are difficult to solve by people, and great inconvenience is brought in the drilling operation process. The development of high-temperature drilling fluid, in particular to an oil field chemical filtrate reducer, is an important problem which needs to be solved urgently.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a preparation method of a drilling fluid filtrate reducer.
The technical scheme of the invention is as follows:
a preparation method of a drilling fluid filtrate reducer comprises the following steps:
(1) crushing an agricultural and forestry waste fiber raw material to a particle size of 1-3mm, preparing cellulose pulp (comprising a solid alkali-active oxygen cooking method, a caustic soda method, sulfate, a mechanical method, neutral sodium sulfite method semi-chemical pulp, cold alkali method chemical mechanical pulp, sulfonated chemical mechanical pulp and chemical hot grinding method mechanical pulp) by using a plurality of methods, adding an organic acid solution with the concentration of 15-65 wt% and a strong oxidant solution with the concentration of 1-5 wt% into the cellulose pulp, reacting at 35-70 ℃ for 12-24h, then carrying out suction filtration, washing with distilled water to be neutral, drying, and then ultrasonically dispersing the dried material into water to prepare a nano-cellulose suspension (1 wt%); the mass ratio of the agricultural and forestry waste fiber raw material, the organic acid solution and the strong oxidant solution is 500-600: 50-80: 20-60;
(2) and fully mixing the nano cellulose suspension (1 wt%), polyvinyl alcohol and bentonite to prepare the drilling fluid filtrate reducer.
In a preferred embodiment of the present invention, the diameter of the nanocellulose in the nanocellulose suspension is 3-15nm and the length is 100-1000 nm.
In a preferred embodiment of the present invention, the polyvinyl alcohol has a molecular weight of 250000-300000 and a purity of 95-96%.
In a preferred embodiment of the present invention, the agricultural and forestry waste fiber feedstock includes at least one of straw fiber, rice hull fiber, mushroom substrate fiber, scrap wood fiber, firewood, bark, peanut hull, tape wood, curly bark, wood shavings, and bamboo shavings.
Further preferably, the fiber raw material of the agricultural and forestry waste is at least one of straw fiber, rice hull fiber, firewood, peanut shell, brushwood, bark and bamboo cuttings.
In a preferred embodiment of the present invention, the organic acid includes at least one of formic acid, acetic acid, maleic acid, sulfamic acid, glycolic acid, citric acid, and ethylenediaminetetraacetic acid.
Further preferably, the organic acid is at least one of formic acid, acetic acid, maleic acid, glycolic acid, citric acid and ethylenediaminetetraacetic acid.
In a preferred embodiment of the present invention, the strong oxidizing agent comprises at least one of sodium hypochlorite, potassium dichromate, hydrogen peroxide, potassium iodate, potassium bromate, and potassium permanganate.
Further preferably, the strong oxidizing agent is sodium hypochlorite, hydrogen peroxide, potassium iodate, potassium bromate or potassium permanganate.
In a preferred embodiment of the present invention, the mass ratio of the nanocellulose suspension, polyvinyl alcohol and bentonite is 150-300: 75-110: 40-70.
The invention has the beneficial effects that:
1. the invention adopts cellulose pulp to prepare nano-cellulose and mixes the nano-cellulose with polyvinyl alcohol and bentonite to form a target product, the preparation method is simple, the yield is high, the cost is low, and the prepared drilling fluid filtrate reducer can achieve the temperature resistance and the salt resistance under the condition of low usage amount.
2. The invention improves the adsorption capacity and the temperature resistance by introducing the long chain and the inherent characteristics of the nano-cellulose, widens the application range of the fluid loss additive, namely expands the fluid loss additive from a medium deep well to a deep well and an ultra-deep well.
3. The novel drilling fluid filtrate reducer is obtained by compounding the nano-cellulose, the traditional polyvinyl alcohol filtrate reducer and the bentonite, the adsorption capacity of charged particles on the surface of clay is increased by the non-ionic polymer and hydrogen bond adsorption, the high-temperature resistance and salt resistance of the drilling fluid are maintained, and the using amount of a treating agent is reduced, so that the novel drilling fluid filtrate reducer is a novel filtrate reducer which has good performance and can be popularized and applied to various complex high-temperature deep wells.
Detailed Description
The technical solution of the present invention is further illustrated and described by the following detailed description.
Example 1
(1) Preparing nano-cellulose: 500 parts by weight of straws are taken and crushed to the particle size of 1mm, and then cellulose pulp is obtained by a solid alkali-active oxygen cooking method. Adding 80 parts by weight of 65 wt% formic acid and 60 parts by weight of 1 wt% sodium hypochlorite into the cellulose pulp, adjusting the temperature to 70 ℃, reacting at a constant temperature for 12 hours, performing suction filtration, washing the cellulose pulp to be neutral by using distilled water, drying the cellulose pulp, and then ultrasonically dispersing the dried material into water to form 1 wt% nano-cellulose suspension for later use, wherein the diameter of the nano-cellulose is 3nm, and the length of the nano-cellulose is 100 nm;
(2) preparing a drilling fluid filtrate reducer: and weighing 200 parts by weight of the nano cellulose suspension, adding 110 parts by weight of polyvinyl alcohol (molecular weight is 250000, purity is 95%) and adding 50 parts by weight of bentonite to compound to obtain the drilling fluid loss reducer.
Example 2
(1) Preparing nano-cellulose: taking 600 parts by weight of rice hull, crushing the rice hull into particles with the particle size of 2mm, and then adding persulfate to obtain cellulose pulp. Adding 50 parts by weight of a mixture of 60% acetic acid and maleic acid, 50 parts by weight of a mixture of 5% hydrogen peroxide and potassium iodate into the cellulose pulp, adjusting the temperature to 60 ℃, reacting at a constant temperature for 24 hours, carrying out suction filtration, washing the obtained product with distilled water to be neutral, drying the product, and then ultrasonically dispersing the dried product into water to form 1 wt% nano-cellulose suspension for later use, wherein the diameter of the nano-cellulose is 8nm, and the length of the nano-cellulose is 500 nm;
(2) preparing a drilling fluid filtrate reducer: weighing 150 parts by weight of the nano cellulose suspension, adding 110 parts by weight of polyvinyl alcohol (molecular weight is 300000, purity is 96%), and adding 40 parts by weight of bentonite to compound to obtain the drilling fluid loss additive.
Example 3
(1) Preparing nano-cellulose: and (3) crushing 550 parts by weight of the mixture of leftover materials and firewood into particles with the particle size of 3mm, and obtaining cellulose pulp by a mechanical method. Adding 60 parts by weight of 15% citric acid and 20 parts by weight of 3% potassium permanganate into the cellulose pulp, adjusting the temperature to 35 ℃, carrying out constant temperature reaction for 18 hours, carrying out suction filtration, washing the cellulose pulp with distilled water to be neutral, drying the cellulose pulp, and then ultrasonically dispersing the dried material into water to form 1 wt% nano-cellulose suspension for later use, wherein the diameter of the nano-cellulose is 15nm, and the length of the nano-cellulose is 1000 nm;
(2) preparing a drilling fluid filtrate reducer: and weighing 225 parts by weight of the nano cellulose suspension, 75 parts by weight of polyvinyl alcohol (molecular weight is 280000 and purity is 95.5%), and 70 parts by weight of bentonite, and compounding to obtain the drilling fluid loss reducer.
Example 4
(1) Preparing nano-cellulose: and (3) taking 540 parts by weight of the mixture of the peanut shells and the wood of the branches, crushing the mixture into particles with the particle size of 2mm, and obtaining the cellulose pulp by a cold-alkali chemical mechanical method. Adding 50 parts by weight of 40% ethylene diamine tetraacetic acid and 30 parts by weight of 5% hydrogen peroxide into the cellulose pulp, adjusting the temperature to 50 ℃, carrying out constant temperature reaction for 15 hours, carrying out suction filtration, washing the cellulose pulp to be neutral by using distilled water, drying the cellulose pulp, and then ultrasonically dispersing the dried material into water to form 1 wt% nano cellulose suspension for later use, wherein the diameter of the nano cellulose is 5nm, and the length of the nano cellulose is 700 nm;
(2) preparing a drilling fluid filtrate reducer: weighing 235 parts by weight of the nano cellulose suspension, adding 75 parts by weight of polyvinyl alcohol (molecular weight is 250000, purity is 95%), and adding 70 parts by weight of bentonite to compound to obtain the drilling fluid loss reducer.
Example 5
(1) Preparing nano-cellulose: taking 515 parts by weight of bamboo sawdust, crushing the bamboo sawdust into particles with the particle size of 3mm, obtaining cellulose pulp by a chemical hot grinding method, adding 50 parts by weight of 40% glycolic acid and 20 parts by weight of 5% potassium bromate into the cellulose pulp, adjusting the temperature to 40 ℃, reacting at constant temperature for 16 hours, carrying out suction filtration, washing the cellulose pulp to be neutral by using distilled water, drying the cellulose pulp, and then ultrasonically dispersing the dried material into water to form 1 wt% of nano-cellulose suspension for later use, wherein the diameter of the nano-cellulose is 9nm, and the length of the nano-cellulose is 600 nm;
(2) preparing a drilling fluid filtrate reducer: and weighing 300 parts by weight of the nano cellulose suspension, adding 75 parts by weight of polyvinyl alcohol (molecular weight is 290000, purity is 96%), and adding 40 parts by weight of bentonite to compound to obtain the drilling fluid loss additive.
Example 6
(1) Preparing nano-cellulose: crushing 520 parts by weight of a mixture of straws and barks to a particle size of 3mm, obtaining cellulose pulp by a neutral sodium sulfite method semi-chemical method, adding 65 parts by weight of a mixture (1: 1) of 30% glycolic acid and citric acid and 40 parts by weight of 2% potassium iodate into the cellulose pulp, adjusting the temperature to 40 ℃, reacting at a constant temperature for 22 hours, performing suction filtration, washing the cellulose pulp to be neutral by using distilled water, drying the cellulose pulp, and ultrasonically dispersing the dried material in water to form a nano-cellulose suspension with the concentration of 1 wt% for later use, wherein the diameter of the nano-cellulose is 6nm, and the length of the nano-cellulose is 800 nm;
(2) preparing a drilling fluid filtrate reducer: and weighing 225 parts by weight of the nano cellulose suspension, adding 95 parts by weight of polyvinyl alcohol (molecular weight is 300000, purity is 96%), and adding 55 parts by weight of bentonite to compound to obtain the drilling fluid loss additive.
Example 7
And (3) performance testing: the drilling fluid system is prepared according to the following formula: the drilling fluid formula comprises: 360mL of No. 5 white oil, 10g of organic soil, 10g of primary emulsifier (polyisobutylene succinimide) +5g of secondary emulsifier (stearate) +10g of oil-based drilling fluid loss additive (fluid loss additive prepared in examples 1 to 6))+10gCaO+40mL CaCl2(20% aqueous solution) +673g of weighting agent (barite powder). The apparent viscosity (Ay), Plastic Viscosity (PV), dynamic shear force (YP), high temperature high pressure drop fluid loss (HTHP FL, measured at 200 ℃, 3.5 MPa), and breaking voltage (ES) of the drilling fluid system were measured and compared to a blank system (the drilling fluid system described above without the addition of the oil-based drilling fluid loss additive).
The results are shown in Table 1.
TABLE 1 comparative results of drilling fluid performance testing
As can be seen from the data in table 1: after the fluid loss additive prepared in the embodiment is added, compared with a blank system, the Apparent Viscosity (AV), the Plastic Viscosity (PV) and the dynamic shear force (YP) of the drilling fluid have no significant change, which shows that the fluid loss additive has small influence on the rheological property of the oil-based drilling fluid; on the aspect of fluid loss reduction, the fluid loss of the drilling fluid added with the products of the embodiments is obviously reduced, and the reduction rate is more than 55mPa & s, which shows that the oil-based drilling fluid loss additive obtained by the invention has good fluid loss reduction performance. In addition, after the drilling fluid added with the drilling fluid loss additive of each embodiment is aged for 15 hours at 150 ℃, the demulsification voltage is larger than 400v, and the system stability and the rheological property are good, so that the drilling fluid loss additive still keeps stable performance at the high temperature of 150 ℃ and has good high-temperature resistance.
The above description is only a preferred embodiment of the present invention, and therefore should not be taken as limiting the scope of the invention, which is defined by the appended claims.
Claims (10)
1. A preparation method of a drilling fluid filtrate reducer is characterized by comprising the following steps: the method comprises the following steps:
(1) crushing an agricultural and forestry waste fiber raw material to a particle size of 1-3mm, preparing cellulose pulp by a solid alkali-active oxygen cooking method, a caustic soda method, a sulfate method, a mechanical method, a neutral sodium sulfite method, a cold alkali method, a sulfonation chemical mechanical method or a chemical hot milling method, adding an organic acid solution with the concentration of 15-65 wt% and a strong oxidant solution with the concentration of 1-5 wt% into the cellulose pulp, reacting for 12-24h at 35-70 ℃, carrying out suction filtration, washing with distilled water to be neutral, drying, and ultrasonically dispersing the dried material into water to prepare a nano cellulose suspension with the concentration of 0.8-1.2 wt%; the mass ratio of the agricultural and forestry waste fiber raw material, the organic acid solution and the strong oxidant solution is 500-600: 50-80: 20-60;
(2) and fully mixing the nano cellulose suspension, polyvinyl alcohol and bentonite to prepare the fluid loss additive for drilling fluid.
2. The method of claim 1, wherein: the diameter of the nano-cellulose in the nano-cellulose suspension is 3-15nm, and the length is 100-1000 nm.
3. The method of claim 1, wherein: the molecular weight of the polyvinyl alcohol is 250000-300000, and the purity of the polyvinyl alcohol is 95-96%.
4. The method of claim 1, wherein: the agricultural and forestry waste fiber raw material comprises at least one of straw fiber, rice hull fiber, edible fungi matrix fiber, leftover material fiber, firewood, bark, peanut shell, branch firewood, rolled bark, wood shavings and bamboo cuttings.
5. The method of claim 4, wherein: the agricultural and forestry waste fiber raw material is at least one of straw fiber, rice hull fiber, firewood, peanut shell, branch firewood, tree bark and bamboo cuttings.
6. The method of claim 1, wherein: the organic acid comprises at least one of formic acid, acetic acid, maleic acid, sulfamic acid, glycolic acid, citric acid and ethylenediamine tetraacetic acid.
7. The method of claim 6, wherein: the organic acid is at least one of formic acid, acetic acid, maleic acid, glycolic acid, citric acid and ethylenediamine tetraacetic acid.
8. The method of claim 1, wherein: the strong oxidant comprises at least one of sodium hypochlorite, potassium dichromate, hydrogen peroxide, potassium iodate, potassium bromate and potassium permanganate.
9. The method of claim 8, wherein: the strong oxidant is sodium hypochlorite, hydrogen peroxide, potassium iodate, potassium bromate or potassium permanganate.
10. The production method according to any one of claims 1 to 9, characterized in that: the mass ratio of the nano-cellulose suspension, the polyvinyl alcohol and the bentonite is 150-300: 75-110: 40-70.
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