CN112322264B - Borehole wall reinforcing working solution and preparation method thereof - Google Patents
Borehole wall reinforcing working solution and preparation method thereof Download PDFInfo
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- CN112322264B CN112322264B CN202011423169.XA CN202011423169A CN112322264B CN 112322264 B CN112322264 B CN 112322264B CN 202011423169 A CN202011423169 A CN 202011423169A CN 112322264 B CN112322264 B CN 112322264B
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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
- C09K8/42—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
- C09K8/48—Density increasing or weighting additives
Abstract
The invention relates to the technical field of petroleum drilling engineering, in particular to a borehole wall strengthening working solution and a preparation method thereof, wherein the borehole wall strengthening working solution comprises a resin material, a curing agent, a flexible material and a weighting material, and the preparation method comprises the following steps: and under the condition of 0-45 ℃, controlling the stirring speed to 600-1200 rpm, firstly adding a resin material, then adding a curing agent into the resin material, stirring to obtain a first mixture, then adding a flexible material into the first mixture, stirring to obtain a second mixture, then adding a weighting material into the second mixture, and stirring to obtain the borehole wall reinforcing working solution. The well wall reinforcing working solution obtained by the invention has better drilling safety and compressive strength, good toughness and capability of maintaining stability of the well wall, greatly widens the safe density window of the drilling fluid, and provides guarantee for rapid and safe drilling.
Description
Technical Field
The invention relates to the technical field of petroleum drilling engineering, in particular to a borehole wall strengthening working fluid and a preparation method thereof.
Background
In oil drilling, the problem of wellbore stability is a ubiquitous problem worldwide. With the increase of exploration strength in China, technical problems of instability of a well wall of a well under a narrow safe density (pressure) window and the like become important technical problems which are commonly concerned by the current well drilling industry.
The well wall strengthening working fluid is used for plugging and strengthening the drilled unstable stratum after drilling through part of the unstable stratum so as to ensure the safe drilling in the next stage, so that the stability and the bearing capacity of the well wall are obviously improved, the safe density (pressure) window is widened, and the drilling difficulty of the lower complex stratum is reduced.
The cement paste commonly used at present lacks toughness after the well is solidified, and in the drilling process after the cement plug is normally drilled, the cement stone falls off easily in the stratum reinforced by the cement on the upper portion due to frequent vibration of a drilling tool, so that the instability of the reinforced stratum on the upper portion is easily caused, the more serious risk that the drilling tool is stuck due to the falling of the cement stone is greatly increased, the effect of guaranteeing safe drilling is not played, and larger loss is caused on the contrary.
Disclosure of Invention
The invention provides a well wall reinforcing working solution and a preparation method thereof, overcomes the defects of the prior art, and can effectively solve the problems of insufficient stability and pressure bearing capacity and narrow safety density window of the existing cement slurry during well wall reinforcing.
One of the technical schemes of the invention is realized by the following measures: the borehole wall strengthening working solution comprises, by weight, 30-60 parts of a resin material, 30-60 parts of a curing agent, 5-10 parts of a flexible material and 5-10 parts of a weighting material, and is prepared by the following steps: firstly, adding a required amount of resin material at normal temperature, controlling the stirring speed to be 600 rpm-1200 rpm under the condition of 0-45 ℃, adding a required amount of curing agent into the resin material, and stirring for 2-5 hours to obtain a first mixture; secondly, controlling the stirring speed to be 600rpm to 1200rpm under the condition of 0 ℃ to 45 ℃, adding the required amount of flexible material into the first mixture, and stirring for 30min to 60min to obtain a second mixture; and thirdly, controlling the stirring speed to be 600rpm to 1200rpm under the condition of 0 ℃ to 45 ℃, adding the required amount of weighting material into the second mixture, and stirring for 1h to 2h to obtain the well wall strengthening working solution.
The following is a further optimization or/and improvement of one of the above-mentioned technical solutions of the invention:
the resin material is more than two of 40 to 70 mass percent of bisphenol A, 5 to 15 mass percent of dioxirane and butanediol.
The curing agent is more than one of aminomethane with the mass percent concentration of 5-15%, benzyl alcohol with the mass percent concentration of 10-25% and methyl carbamate.
The flexible material is a fiber with a diameter of 10 to 20 microns.
The weighting material is barite powder or iron ore powder.
The second technical scheme of the invention is realized by the following measures: a preparation method of a borehole wall reinforcing working solution is carried out according to the following steps: firstly, adding a required amount of resin material at normal temperature, controlling the stirring speed to be 600rpm to 1200rpm at the temperature of 0 ℃ to 45 ℃, adding a required amount of curing agent into the resin material, and stirring for 2h to 5h to obtain a first mixture; secondly, controlling the stirring speed to be 600rpm to 1200rpm under the condition of 0 ℃ to 45 ℃, adding the required amount of flexible material into the first mixture, and stirring for 30min to 60min to obtain a second mixture; and thirdly, controlling the stirring speed to be 600rpm to 1200rpm under the condition of 0 ℃ to 45 ℃, adding the required amount of weighting material into the second mixture, and stirring for 1h to 2h to obtain the well wall strengthening working solution.
The following is further optimization or/and improvement of the second technical scheme of the invention:
the resin material is more than two of 40 to 70 mass percent of bisphenol A, 5 to 15 mass percent of dioxirane and butanediol.
The curing agent is more than one of aminomethane with the mass percent concentration of 5-15%, benzyl alcohol with the mass percent concentration of 10-25% and methyl carbamate.
The flexible material is a fiber with a diameter of 10 to 20 microns.
The weighting material is barite powder or iron ore powder.
The well wall reinforcing working solution obtained by the invention has better drilling safety and compressive strength, good toughness and capability of maintaining stability of the well wall, greatly widens the safe density window of the drilling fluid, and provides guarantee for rapid and safe drilling.
Detailed Description
The present invention is not limited by the following examples, and specific embodiments may be determined according to the technical solutions and practical situations of the present invention. The chemical reagents and chemical products mentioned in the invention are all well known and commonly used in the prior art unless otherwise specified; the percentages in the invention are mass percentages unless otherwise specified; the solution in the invention is an aqueous solution of water as a solvent unless otherwise specified, for example, a hydrochloric acid solution is an aqueous hydrochloric acid solution; the normal temperature and room temperature in the present invention generally mean a temperature of 15 ℃ to 25 ℃, and are generally defined as 25 ℃.
The invention is further described below with reference to examples:
example 1: the borehole wall strengthening working solution comprises, by weight, 30-60 parts of resin materials, 30-60 parts of curing agents, 5-10 parts of flexible materials and 5-10 parts of weighting materials, and is obtained according to the following steps: firstly, adding a required amount of resin material at normal temperature, controlling the stirring speed to be 600 rpm-1200 rpm under the condition of 0-45 ℃, adding a required amount of curing agent into the resin material, and stirring for 2-5 hours to obtain a first mixture; secondly, controlling the stirring speed to be 600rpm to 1200rpm under the condition of 0 ℃ to 45 ℃, adding the required amount of flexible material into the first mixture, and stirring for 30min to 60min to obtain a second mixture; and thirdly, controlling the stirring speed to be 600rpm to 1200rpm under the condition of 0 ℃ to 45 ℃, adding the required amount of weighting material into the second mixture, and stirring for 1h to 2h to obtain the borehole wall strengthening working solution.
Example 2: the borehole wall strengthening working solution comprises, by weight, 30 parts or 60 parts of resin materials, 30 parts or 60 parts of curing agents, 5 parts or 10 parts of flexible materials and 5 parts or 10 parts of weighting materials, and is obtained according to the following steps: firstly, adding a required amount of resin material at normal temperature, controlling the stirring speed to be 600rpm or 1200rpm at the temperature of 0 ℃ or 45 ℃, adding a required amount of curing agent into the resin material, and stirring for 2 hours or 5 hours to obtain a first mixture; secondly, controlling the stirring speed to be 600rpm or 1200rpm at 0 ℃ or 45 ℃, adding the required amount of flexible material into the first mixture, and stirring for 30min or 60min to obtain a second mixture; and thirdly, controlling the stirring speed to be 600rpm or 1200rpm at 0 ℃ or 45 ℃, adding the required amount of weighting material into the second mixture, and stirring for 1 hour or 2 hours to obtain the borehole wall strengthening working solution.
According to the invention, the resin material is used for curing and forming, so that the compressive strength and toughness are stronger, the curing performance of the curing agent is used for transforming the borehole wall strengthening working fluid, and the deformation and plugging performance of the flexible material and the density adjusting capacity of the weighting material are combined, so that the obtained borehole wall strengthening working fluid has better drilling safety and compressive strength, good toughness and the capacity of maintaining borehole wall stability, the safe density window of the drilling fluid is greatly widened, and the guarantee is provided for rapid and safe drilling.
In the present invention, the resin material, the curing agent, the flexible material and the weight material are all commercially available products. Bisphenol A is 2, 2-bis (4-hydroxyphenyl) propane.
Example 3: as optimization of the above embodiment, the resin material is two or more of bisphenol a at a concentration of 40% to 70% by mass, dioxirane at a concentration of 5% to 15% by mass, and butanediol. The resin material has stronger compressive strength and toughness after being cured and molded, and is used as the main body of the borehole wall strengthening working solution, so that the borehole wall strengthening working solution has better compressive strength and toughness.
Example 4: as optimization of the above embodiment, the curing agent is more than one of aminomethane with a mass percentage concentration of 5% to 15%, benzyl alcohol with a mass percentage concentration of 10% to 25%, and methyl carbamate. The curing agent has curing properties that enable the liquid to consolidate into a solid.
Example 5: as an optimization of the above embodiment, the flexible material is a fiber with a diameter of 10 to 20 microns. The flexible material has certain deformation and plugging performance, can assist in plugging larger cracks without leakage, and is a good bridging material.
Example 6: as optimization of the above embodiment, the weighting material is barite powder or iron ore powder. The weighting material can adjust the density, so that the invention keeps the density consistent with the density of the downhole drilling fluid.
Example 7: the borehole wall strengthening working solution is prepared from the following raw materials in parts by weight: the method comprises the following steps of firstly, adding 15 parts of bisphenol A and 15 parts of ethylene oxide at normal temperature, controlling the stirring speed to be 600rpm at the temperature of 0 ℃, adding 30 parts of 5-15% aminomethane, and stirring for 2 hours to obtain a first mixture; secondly, controlling the stirring speed to be 600rpm at the temperature of 0 ℃, adding 5 parts of 10-micron fibers into the first mixture, and stirring for 30min to obtain a second mixture; and thirdly, controlling the stirring speed to 600rpm at 0 ℃, adding 5 parts of barite powder into the second mixture, and stirring for 1 hour to obtain the borehole wall strengthening working solution.
Example 8: the borehole wall strengthening working solution is prepared from the following raw materials in parts by weight: step one, adding 30 parts of bisphenol A and 30 parts of dioxirane at normal temperature, controlling the stirring speed to be 1200rpm at the temperature of 45 ℃, adding 60 parts of methyl carbamate, and stirring for 5 hours to obtain a first mixture; secondly, controlling the stirring speed to be 1200rpm at the temperature of 45 ℃, adding 10 parts of 20-micron fibers into the first mixture, and stirring for 60min to obtain a second mixture; and thirdly, controlling the stirring speed to 1200rpm at 45 ℃, adding 10 parts of iron ore powder into the second mixture, and stirring for 2 hours to obtain the borehole wall reinforcing working solution.
Example 9: the borehole wall strengthening working solution is prepared from the following raw materials in parts by weight: the method comprises the following steps of firstly, adding 15 parts of bisphenol A, 15 parts of diepoxy ethane and 15 parts of butanediol at normal temperature, controlling the stirring speed to be 900rpm at 25 ℃, adding 22.5 parts of 5-15% aminomethane and 22.5 parts of benzyl alcohol with the mass percent concentration of 10-25%, and stirring for 3.5 hours to obtain a first mixture; secondly, controlling the stirring speed to be 900rpm at 25 ℃, adding 7.5 parts of 15-micron fibers into the first mixture, and stirring for 45min to obtain a second mixture; and thirdly, controlling the stirring speed to be 900rpm at 25 ℃, adding 7.5 parts of barite powder into the second mixture, and stirring for 1.5 hours to obtain the well wall strengthening working solution.
Example 10: the preparation method of the borehole wall strengthening working solution is carried out according to the following steps: firstly, adding a required amount of resin material at normal temperature, controlling the stirring speed to be 600 rpm-1200 rpm under the condition of 0 ℃ to 45 ℃, adding a required amount of curing agent, and stirring for 2 h-5 h to obtain a first mixture; secondly, controlling the stirring speed to be 600rpm to 1200rpm under the condition of 0 ℃ to 45 ℃, adding the required amount of flexible material into the first mixture, and stirring for 30min to 60min to obtain a second mixture; and thirdly, controlling the stirring speed to be 600rpm to 1200rpm under the condition of 0 ℃ to 45 ℃, adding the required amount of weighting material into the second mixture, and stirring for 1h to 2h to obtain the borehole wall strengthening working solution.
Example 11: the borehole wall strengthening working solution is prepared from the following raw materials in parts by weight: firstly, adding 25 parts of bisphenol A and 25 parts of dioxirane at normal temperature, controlling the stirring speed to 800rpm at 25 ℃, adding 20 parts of 5-15% aminomethane and 20 parts of benzyl alcohol with the mass percent concentration of 10-25%, and stirring for 2 hours to obtain a first mixture; secondly, controlling the stirring speed to 800rpm at 25 ℃, adding 5 parts of 10-micron fibers into the first mixture, and stirring for 30min to obtain a second mixture; and thirdly, controlling the stirring speed to be 800rpm at 25 ℃, adding 5 parts of barite powder into the second mixture, and stirring for 1 hour to obtain the borehole wall strengthening working solution.
Example 12: the borehole wall strengthening working solution is prepared from the following raw materials in parts by weight: the method comprises the following steps of firstly, adding 10 parts of bisphenol A, 10 parts of diepoxide and 10 parts of butanediol at normal temperature, controlling the stirring speed to 700rpm under the condition of 26 ℃, adding 20 parts of 5-15% of aminomethane, 20 parts of benzyl alcohol with the mass percentage concentration of 10-25% and 20 parts of methyl carbamate, and stirring for 5 hours to obtain a first mixture; secondly, controlling the stirring speed to 700rpm at 26 ℃, adding 5 parts of 20-micron fibers into the first mixture, and stirring for 60min to obtain a second mixture; and thirdly, controlling the stirring speed to 700rpm at 26 ℃, adding 5 parts of iron ore powder into the second mixture, and stirring for 2 hours to obtain the borehole wall reinforcing working solution.
Example 13: the borehole wall strengthening working solution is prepared from the following raw materials in parts by weight: the method comprises the following steps of firstly, adding 30 parts of bisphenol A and 30 parts of dioxirane at normal temperature, controlling the stirring speed to 800rpm at 25 ℃, adding 15 parts of 5-15% aminomethane and 15 parts of benzyl alcohol with the mass percent concentration of 10-25%, and stirring for 2 hours to obtain a first mixture; secondly, controlling the stirring speed to 800rpm at 25 ℃, adding 5 parts of 10-micron fibers into the first mixture, and stirring for 60min to obtain a second mixture; and thirdly, controlling the stirring speed to 800rpm at 25 ℃, adding 5 parts of barite powder into the second mixture, and stirring for 1 hour to obtain the borehole wall strengthening working solution.
The results of the thermal stability and compressive strength tests of the borehole wall strengthening working fluids and grouts obtained in examples 11, 12 and 13 are shown in Table 1. The specific test method comprises the following steps: the cement slurry with the same density and the borehole wall reinforcing working solution are respectively placed in cylindrical steel moulds (30 mm multiplied by 50 mm) with the same size, the moulds filled with two different fluids are simultaneously placed in a curing kettle, are cured for 24 hours at certain temperature (60 ℃, 80 ℃ and 120 ℃), are taken out of the moulds, and are placed under a press machine for testing the compressive strength.
As can be seen from Table 1, the density was 1.1g/cm 3 The thermal stability of the cement paste is 60 ℃, and the compressive strength is 23MPa; example 11 the density obtained was 1.1g/cm 3 The thermal stability of the borehole wall reinforcing working solution is 60 ℃, and the compressive strength is 46MPa; the density was 1.5g/cm 3 The thermal stability of the cement paste is 80 ℃, and the compressive strength is 26MPa; example 12 the density obtained was 1.5g/cm 3 The borehole wall strengthening working solution has the thermal stability of 80 ℃ and the compressive strength of 42MPa; the density was 2.0g/cm 3 The thermal stability of the cement paste is 120 ℃, and the compressive strength is 30MPa; example 13 the density obtained was 2.0g/cm 3 The borehole wall reinforcing working solution has the thermal stability of 120 ℃ and the compressive strength of 48MPa.
As can be seen from the data in table 1, under the same experimental conditions, the compressive strength of the borehole wall strengthening working fluid obtained in accordance with embodiments 11, 12 and 13 of the present invention after curing is higher than that of the currently used cement slurry, which is on average 1.5 times to 2 times higher, indicating that the borehole wall strengthening working fluid obtained in accordance with the present invention has better compressive strength and better ability to maintain borehole wall stability.
In conclusion, the borehole wall strengthening working fluid obtained by the invention has better drilling safety and compressive strength, good toughness and the capability of maintaining the stability of the borehole wall, greatly widens the safe density window of the drilling fluid, and provides guarantee for rapid and safe drilling.
The technical characteristics form an embodiment of the invention, which has strong adaptability and implementation effect, and unnecessary technical characteristics can be increased or decreased according to actual needs to meet the requirements of different situations.
Claims (8)
1. The borehole wall strengthening working solution is characterized by comprising 30-60 parts of resin material, 30-60 parts of curing agent, 5-10 parts of flexible material and 5-10 parts of weighting material according to parts by weight, and is prepared by the following steps: firstly, adding a required amount of resin material at normal temperature, controlling the stirring speed to be 600 rpm-1200 rpm under the condition of 0-45 ℃, adding a required amount of curing agent into the resin material, and stirring for 2-5 hours to obtain a first mixture; secondly, controlling the stirring speed to be 600rpm to 1200rpm under the condition of 0 ℃ to 45 ℃, adding the required amount of flexible material into the first mixture, and stirring for 30min to 60min to obtain a second mixture; thirdly, controlling the stirring speed to be 600rpm to 1200rpm under the condition of 0 ℃ to 45 ℃, adding the required amount of weighting material into the second mixture, and stirring for 1h to 2h to obtain the well wall strengthening working solution; wherein the resin material comprises 40 to 70 mass percent of bisphenol A, 5 to 15 mass percent of dioxirane and butanediol, or 40 to 70 mass percent of bisphenol A and 5 to 15 mass percent of dioxirane.
2. The borehole wall strengthening working fluid as recited in claim 1, wherein the curing agent is one or more of aminomethane with a mass percentage concentration of 5% to 15%, benzyl alcohol with a mass percentage concentration of 10% to 25%, and methyl carbamate.
3. The wellbore wall strengthening working fluid of claim 1 or 2, wherein the flexible material is a fiber with a diameter of 10 microns to 20 microns.
4. The borehole wall strengthening working fluid according to claim 1 or 2, wherein the weighting material is barite powder or iron ore powder.
5. The preparation method of the borehole wall strengthening working solution is characterized in that the raw materials comprise 30 to 60 parts of resin material, 30 to 60 parts of curing agent, 5 to 10 parts of flexible material and 5 to 10 parts of weighting material according to parts by weight, and the preparation method comprises the following steps: firstly, adding a required amount of resin material at normal temperature, controlling the stirring speed to be 600 rpm-1200 rpm under the condition of 0-45 ℃, adding a required amount of curing agent into the resin material, and stirring for 2-5 hours to obtain a first mixture; secondly, controlling the stirring speed to be 600rpm to 1200rpm under the condition of 0 ℃ to 45 ℃, adding the required amount of flexible material into the first mixture, and stirring for 30min to 60min to obtain a second mixture; thirdly, controlling the stirring speed to be 600rpm to 1200rpm under the condition of 0 ℃ to 45 ℃, adding the required amount of weighting material into the second mixture, and stirring for 1h to 2h to obtain the well wall strengthening working solution; wherein the resin material comprises 40 to 70 mass percent of bisphenol A, 5 to 15 mass percent of dioxirane and butanediol, or 40 to 70 mass percent of bisphenol A and 5 to 15 mass percent of dioxirane.
6. The preparation method of the borehole wall strengthening working fluid according to claim 5, characterized in that the curing agent is more than one of aminomethane with a mass percentage concentration of 5% to 15%, benzyl alcohol with a mass percentage concentration of 10% to 25%, and methyl carbamate.
7. The method for preparing the borehole wall strengthening working fluid according to the claim 5 or 6, characterized in that the flexible material is fiber with a diameter of 10 to 20 microns.
8. The method for preparing the borehole wall strengthening working solution according to claim 5 or 6, wherein the weighting material is barite powder or iron ore powder.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB0522653D0 (en) * | 2005-11-07 | 2005-12-14 | Downhole Fluid Solutions Ltd | Improvements in materials for use in subterranean formations |
| CN103527137B (en) * | 2012-07-04 | 2016-06-22 | 中国石油化工股份有限公司 | A kind of method increasing borehole wall stability |
| CN104564082B (en) * | 2013-10-27 | 2016-08-17 | 中国石油化工集团公司 | A kind of oil drilling borehole wall reinforcement means |
| CN103820092B (en) * | 2014-01-29 | 2016-07-20 | 中国石油集团西部钻探工程有限公司 | Borehole wall reinforcement material and preparation method thereof |
| CN109868124A (en) * | 2017-12-04 | 2019-06-11 | 中国石油化工股份有限公司 | A kind of drilling fluid and preparation method thereof for displaced type gas cut stratum |
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