CN111978936B - High-temperature-resistant nano latex plugging anti-sloughing agent for drilling fluid and preparation method thereof - Google Patents
High-temperature-resistant nano latex plugging anti-sloughing agent for drilling fluid and preparation method thereof Download PDFInfo
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Abstract
The invention relates to the technical field of plugging anti-collapse agents for drilling fluids, in particular to a high-temperature resistant nano latex plugging anti-collapse agent for drilling fluids and a preparation method thereof. The high-temperature resistant nano latex plugging anti-sloughing agent for the drilling fluid has good plugging anti-sloughing performance, can plug micropores and enter the microcracks to form a low-permeability closed membrane, has a good filtrate loss reduction effect, also has good temperature resistance, and is suitable for drilling wells in various complex stratums.
Description
Technical Field
The invention relates to the technical field of plugging and anti-sloughing agents for drilling fluids, and discloses a high-temperature-resistant nano latex plugging and anti-sloughing agent for drilling fluids and a preparation method thereof.
Background
The drilling fluid is a general name of various circulating fluids which meet the requirements of drilling work by multiple functions in the drilling process. The drilling fluid is the blood of well drilling, also known as the flushing fluid of drilling, the drilling fluid can be divided into clear water, mud, flushing fluid without clay phase, emulsion, foam and compressed air, etc. according to the composition, the clear water is the earliest used drilling fluid, does not need to be processed, is convenient to use, is suitable for the areas with complete rock stratum and sufficient water source, the mud is the widely used drilling fluid, is mainly suitable for the unstable rock stratum of pore wall such as loose, crack development, easy collapse and block falling, water swelling and peeling, etc., along with the complexity of the encountered stratum condition, the difficulty of exploiting petroleum is gradually increased, higher requirements are also put forward to the drilling fluid, and the plugging anti-collapse agent for drilling fluid is one of the important treating agents in the drilling of oil and gas fields, at present, the existing plugging anti-collapse agent has the following problems: the temperature resistance is poor, plugging cannot be well carried out when a micro-crack stratum is encountered, and the plugging and anti-collapse effects are poor.
Disclosure of Invention
The invention provides a high-temperature-resistant nano latex plugging anti-sloughing agent for drilling fluid and a preparation method thereof, overcomes the defects of the prior art, and can effectively solve the problems of poor temperature resistance and poor plugging anti-sloughing effect of the existing plugging anti-sloughing agent.
One of the technical schemes of the invention is realized by the following measures: the high-temperature resistant nano latex plugging anti-sloughing agent for the drilling fluid comprises 150 to 200 parts of synthetic oil, 35 to 50 parts of polyethylene glycol, 35 to 50 parts of glycerol, 70 to 100 parts of acrylamide, 200 to 250 parts of vinyl acetate, 250 to 300 parts of epoxy chloropropane, 35 to 50 parts of N-vinylpyridine, 5 to 10 parts of a catalyst and 90 to 120 parts of water in parts by weight, and is obtained by the following method: step one, fully stirring the synthetic oil, the polyethylene glycol and the glycerol with required amounts, adding the water with required amounts for shearing, and fully emulsifying to obtain a polymerization solvent; secondly, adding acrylamide, vinyl acetate, epichlorohydrin and N-vinylpyridine with required amounts into a polymerization solvent, and fully stirring and dissolving to obtain a mixed material; and thirdly, dissolving a required amount of catalyst in required amount of water to obtain a catalyst solution, then adding the catalyst solution into the mixture, stirring and shearing the mixture, and carrying out polymerization reaction to obtain the high-temperature resistant nano latex plugging anti-collapse agent for the drilling fluid.
The following is a further optimization or/and improvement of one of the above-mentioned technical solutions of the invention:
the raw material synthetic oil is formed by mixing white oil and vegetable oil according to a weight ratio of 7.
The raw material catalyst is proline.
In the first step, the stirring time is 28min to 32min.
In the first step, the shearing temperature is 65-75 ℃, and the shearing time is 55-65 min.
In the third step, the reaction temperature is 65-75 ℃, and the reaction time is 2.8-3.2 h.
In the third step, the catalyst is dissolved in 30 to 40 parts of water, and the catalyst solution is added dropwise for 20 to 30min.
The second technical scheme of the invention is realized by the following measures: the preparation method of the high-temperature resistant nano latex plugging anti-sloughing agent for the drilling fluid comprises the following raw materials, by weight, 150-200 parts of synthetic oil, 35-50 parts of polyethylene glycol, 35-50 parts of glycerol, 70-100 parts of acrylamide, 200-250 parts of vinyl acetate, 250-300 parts of epichlorohydrin, 35-50 parts of N-vinylpyridine, 5-10 parts of a catalyst and 90-120 parts of water, and is carried out according to the following method: step one, fully stirring the synthetic oil, the polyethylene glycol and the glycerol with required amounts, adding the water with required amounts for shearing, and fully emulsifying to obtain a polymerization solvent; secondly, adding acrylamide, vinyl acetate, epichlorohydrin and N-vinylpyridine into a polymerization solvent in required amounts, and fully stirring and dissolving to obtain a mixed material; and thirdly, dissolving the required amount of catalyst in the required amount of water to obtain a catalyst solution, then adding the catalyst solution into the mixture, stirring and shearing the mixture, and carrying out polymerization reaction to obtain the high-temperature resistant nano latex plugging anti-sloughing agent for the drilling fluid.
The following is further optimization or/and improvement of the second technical scheme of the invention:
the raw material synthetic oil is formed by mixing white oil and vegetable oil according to a weight ratio of 7.
The raw material catalyst is proline.
In the first step, the stirring time is 28min to 32min.
In the first step, the shearing temperature is 65-75 ℃, and the shearing time is 55-65 min.
In the third step, the reaction temperature is 65-75 ℃, and the reaction time is 2.8-3.2 h.
In the third step, the catalyst is dissolved in 30 to 40 parts of water, and the catalyst solution is added dropwise for 20 to 30min.
The high-temperature resistant nano latex plugging anti-sloughing agent for the drilling fluid has good plugging anti-sloughing performance, can plug micropores and enter the microcracks to form a low-permeability closed membrane, has a good filtrate loss reduction effect, also has good temperature resistance, and is suitable for drilling wells in various complex stratums.
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 various chemical reagents and chemical articles mentioned in the invention are all the chemical reagents and chemical articles which are 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 present invention is an aqueous solution in which the solvent is water, for example, a hydrochloric acid solution is an aqueous hydrochloric acid solution, unless otherwise specified; 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 high-temperature resistant nano latex plugging anti-sloughing agent for drilling fluid comprises 150-200 parts of synthetic oil, 35-50 parts of polyethylene glycol, 35-50 parts of glycerol, 70-100 parts of acrylamide, 200-250 parts of vinyl acetate, 250-300 parts of epoxy chloropropane, 35-50 parts of N-vinylpyridine, 5-10 parts of catalyst and 90-120 parts of water according to parts by weight, and is obtained by the following method: step one, fully stirring required amounts of synthetic oil, polyethylene glycol and glycerol, adding required amounts of water for shearing, and fully emulsifying to obtain a polymerization solvent; secondly, adding acrylamide, vinyl acetate, epichlorohydrin and N-vinylpyridine into a polymerization solvent in required amounts, and fully stirring and dissolving to obtain a mixed material; and thirdly, dissolving a required amount of catalyst in required amount of water to obtain a catalyst solution, then adding the catalyst solution into the mixture, stirring and shearing the mixture, and carrying out polymerization reaction to obtain the high-temperature resistant nano latex plugging anti-collapse agent for the drilling fluid.
The high-temperature resistant nano latex plugging anti-collapse agent for the drilling fluid is obtained by performing polymerization reaction on raw materials, wherein in the drilling process, micro particles in the high-temperature resistant nano latex plugging anti-collapse agent for the drilling fluid can form a closed membrane in a permeable or microcracked stratum, adhere to a well wall under the action of pressure difference and gather into deformable micelles, and when the drilling fluid starts to permeate into shale, the micelles spread on the shale to form a low-permeability closed membrane at the croup of the shale, so that the permeation of the drilling fluid is prevented, and the filtration loss of the drilling fluid is effectively reduced.
Example 2: the high-temperature resistant nano latex plugging anti-sloughing agent for the drilling fluid comprises 150 parts or 200 parts of synthetic oil, 35 parts or 50 parts of polyethylene glycol, 35 parts or 50 parts of glycerol, 70 parts or 100 parts of acrylamide, 200 parts or 250 parts of vinyl acetate, 250 parts or 300 parts of epoxy chloropropane, 35 parts or 50 parts of N-vinylpyridine, 5 parts or 10 parts of a catalyst and 90 parts or 120 parts of water according to parts by weight, and is obtained by the following method: step one, fully stirring the synthetic oil, the polyethylene glycol and the glycerol with required amounts, adding the water with required amounts for shearing, and fully emulsifying to obtain a polymerization solvent; secondly, adding acrylamide, vinyl acetate, epichlorohydrin and N-vinylpyridine with required amounts into a polymerization solvent, and fully stirring and dissolving to obtain a mixed material; and thirdly, dissolving a required amount of catalyst in required amount of water to obtain a catalyst solution, then adding the catalyst solution into the mixture, stirring and shearing the mixture, and carrying out polymerization reaction to obtain the high-temperature resistant nano latex plugging anti-collapse agent for the drilling fluid.
Example 3: as optimization of the above embodiment, the raw material synthetic oil is formed by mixing white oil and vegetable oil according to the weight ratio of 7.
Example 4: as an optimization of the above example, the feed catalyst was proline.
Example 5: as optimization of the above embodiment, in the first step, the stirring time is 28min to 32min.
Example 6: as the optimization of the embodiment, in the first step, the shearing temperature is 65-75 ℃, and the shearing time is 55-65 min.
Example 7: as optimization of the above example, in the third step, the reaction temperature is 65 ℃ to 75 ℃ and the reaction time is 2.8h to 3.2h.
Example 8: as optimization of the above example, in the third step, the catalyst is dissolved in 30 to 40 parts of water, and the catalyst solution is added dropwise for 20 to 30min.
Example 9: the high-temperature resistant nano latex plugging anti-sloughing agent for the drilling fluid comprises 150 parts of synthetic oil, 35 parts of polyethylene glycol, 35 parts of glycerol, 70 parts of acrylamide, 200 parts of vinyl acetate, 250 parts of epoxy chloropropane, 35 parts of N-vinylpyridine, 5 parts of proline and 90 parts of water in parts by weight, and is obtained by the following method: step one, fully stirring required amounts of synthetic oil, polyethylene glycol and glycerol, adding required amounts of water for shearing, and fully emulsifying to obtain a polymerization solvent, wherein the stirring time is 28min, the shearing temperature is 65 ℃, the shearing time is 55min, and the raw material synthetic oil is prepared by mixing white oil and vegetable oil according to a weight ratio of 7; secondly, adding acrylamide, vinyl acetate, epichlorohydrin and N-vinylpyridine into a polymerization solvent in required amounts, and fully stirring and dissolving to obtain a mixed material; and thirdly, dissolving proline in a required amount in water to obtain a proline solution, adding a proline solution into the mixture, stirring, shearing and carrying out polymerization reaction to obtain the high-temperature-resistant nano latex plugging anti-collapse agent for the drilling fluid, wherein the reaction temperature is 65 ℃, the reaction time is 2.8 hours, the proline is dissolved in 30 parts of water, and the proline solution is added dropwise for 20min.
Example 10: the high-temperature resistant nano latex plugging anti-sloughing agent for the drilling fluid comprises, by weight, 200 parts of synthetic oil, 50 parts of polyethylene glycol, 50 parts of glycerol, 100 parts of acrylamide, 250 parts of vinyl acetate, 300 parts of epichlorohydrin, 50 parts of N-vinylpyridine, 10 parts of proline and 120 parts of water, and is obtained by the following method: step one, fully stirring required amounts of synthetic oil, polyethylene glycol and glycerol, adding required amounts of water for shearing, and fully emulsifying to obtain a polymerization solvent, wherein the stirring time is 32min, the shearing temperature is 75 ℃, the shearing time is 65min, and the raw material synthetic oil is prepared by mixing white oil and vegetable oil according to a weight ratio of 7; secondly, adding acrylamide, vinyl acetate, epichlorohydrin and N-vinylpyridine with required amounts into a polymerization solvent, and fully stirring and dissolving to obtain a mixed material; and thirdly, dissolving proline in a required amount in water to obtain a proline solution, adding a proline solution into the mixture, stirring, shearing and carrying out polymerization reaction to obtain the high-temperature-resistant nano latex plugging anti-collapse agent for the drilling fluid, wherein the reaction temperature is 75 ℃, the reaction time is 3.2 hours, the proline is dissolved in 40 parts of water, and the proline solution is added dropwise for 30min.
Example 11: the high-temperature resistant nano latex plugging anti-sloughing agent for drilling fluid comprises, by weight, 180 parts of synthetic oil, 45 parts of polyethylene glycol, 45 parts of glycerol, 90 parts of acrylamide, 230 parts of vinyl acetate, 280 parts of epichlorohydrin, 45 parts of N-vinylpyridine, 8 parts of proline and 110 parts of water, and is obtained by the following method: step one, fully stirring required amounts of synthetic oil, polyethylene glycol and glycerol, adding required amounts of water for shearing, and fully emulsifying to obtain a polymerization solvent, wherein the stirring time is 30min, the shearing temperature is 70 ℃, the shearing time is 60min, and the raw material synthetic oil is prepared by mixing white oil and vegetable oil according to a weight ratio of 7; secondly, adding acrylamide, vinyl acetate, epichlorohydrin and N-vinylpyridine with required amounts into a polymerization solvent, and fully stirring and dissolving to obtain a mixed material; and thirdly, dissolving proline in a required amount in water to obtain a proline solution, adding a proline solution into the mixture, stirring, shearing and carrying out polymerization reaction to obtain the high-temperature-resistant nano latex plugging anti-collapse agent for the drilling fluid, wherein the reaction temperature is 70 ℃, the reaction time is 3.0h, the proline is dissolved in 35 parts of water, and the proline solution is added dropwise for 25min.
Example 12: the high-temperature resistant nano latex plugging anti-sloughing agent for the drilling fluid is obtained by the following method: step one, adding 200 parts of synthetic oil, 50 parts of polyethylene glycol and 50 parts of glycerol into a vortex type liquid grinder, circularly stirring for 30 minutes, then adding 80 parts of water, circularly shearing for 60 minutes at the shearing temperature of 70 ℃, and fully emulsifying to obtain a polymerization solvent, wherein the raw material synthetic oil is prepared by mixing white oil and vegetable oil according to a weight ratio of 7; secondly, adding 100 parts of acrylamide, 250 parts of vinyl acetate, 300 parts of epichlorohydrin and 50 parts of N-vinylpyridine into a vortex type liquid grinder with a polymerization solvent, and fully stirring and dissolving to obtain a mixed material; and thirdly, dissolving 10 parts of proline in 40 parts of water to obtain a proline solution, dropwise adding the proline solution into a vortex type liquid grinding machine with a mixed material within 30min, stirring, shearing and carrying out polymerization reaction at the temperature of 70 ℃, and reacting for 3h to obtain the high-temperature-resistant nano latex plugging anti-sloughing agent for the drilling fluid.
The following is the investigation of the performance of the high temperature resistant nano-latex plugging anti-collapse agent for the drilling fluid
The test method comprises the following steps: the existing plugging and anti-sloughing agent is adopted as a comparative example and is emulsified asphalt, 3 percent of the high-temperature resistant nano-latex plugging and anti-sloughing agent for drilling fluid obtained in the embodiments 9 to 12 and the existing plugging and anti-sloughing agent are respectively added into a fresh water-based slurry system, and the detection method specified in GB/T16783.1 is carried out under certain conditionsAnd the low-temperature and low-pressure filtration loss FL in a fresh water-based slurry system respectively added with the high-temperature resistant nano latex plugging and anti-sloughing agent for the drilling fluid obtained in the examples 9 to 12 and the existing plugging and anti-sloughing agent is measured API And high temperature high pressure filtration loss FL HTHP 。
The specific preparation process of the fresh water base pulp and 3 percent of samples comprises the following steps: firstly, adding 400mL of distilled water and 0.96g of anhydrous sodium carbonate into a high-speed stirring cup to dissolve, slowly adding 16.0g of bentonite for drilling fluid slurry preparation under the high-speed stirring condition of 11000r/min, stirring for 20min to avoid agglomeration, stopping stirring for at least 2 times to scrape the bentonite for drilling fluid slurry preparation adhered to the cup wall, and then carrying out closed maintenance at the temperature of 25 +/-1 ℃ for 24h to obtain fresh water-based slurry; secondly, slowly adding 12.00g of sample into the fresh water base slurry under the high-speed stirring of 11000r/min, stirring for 20min, stopping for at least 2 times during the stirring to scrape the drilling fluid sample adhered to the cup wall, respectively filling the fresh water base slurry and the fresh water base slurry added with the sample into an aging tank, hot rolling for 16 hours in a roller heating furnace at the temperature of 180 ℃, cooling to the room temperature, then transferring into a high stirring cup, stirring for 5min under the high-speed condition of 11000r/min, and measuring the low-temperature low-pressure filtration loss FL 16783.1 according to the method specified by GB/T16783.1 API And high temperature high pressure filtration loss FL HTHPP . Wherein the samples are the high-temperature resistant nano latex plugging anti-sloughing agent for drilling fluid obtained in the embodiments 9 to 12 of the invention and the existing plugging anti-sloughing agent respectively.
And (3) test results: as shown in Table 1, compared with the addition of the existing plugging anti-collapse agent in the fresh water base slurry at 180 ℃, the low-temperature and low-pressure filtration loss FL in the fresh water base slurry system is obtained by adding the high-temperature resistant nano latex plugging anti-collapse agent for the drilling fluid into the fresh water base slurry at 180 DEG C API, And high temperature high pressure filtration loss FL HTHP The high-temperature resistant nano latex plugging anti-collapse agent for the drilling fluid has good temperature resistance compared with the existing plugging anti-collapse agent, and has strong plugging anti-collapse capability and good fluid loss reduction effect compared with the existing plugging anti-collapse agent added in a fresh water drilling fluid system at 180 ℃.
In conclusion, the high-temperature resistant nano latex plugging anti-sloughing agent for the drilling fluid has good plugging anti-sloughing performance, can plug micropores and enter the microcracks to form a low-permeability closed membrane, has a good fluid loss reduction effect, has good temperature resistance, and is suitable for drilling wells in various complex stratums.
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 (4)
1. The high-temperature-resistant nano latex plugging anti-sloughing agent for the drilling fluid is characterized by comprising 150 to 200 parts of synthetic oil, 35 to 50 parts of polyethylene glycol, 35 to 50 parts of glycerol, 70 to 100 parts of acrylamide, 200 to 250 parts of vinyl acetate, 250 to 300 parts of epoxy chloropropane, 35 to 50 parts of N-vinylpyridine, 5 to 10 parts of catalyst and 90 to 120 parts of water in parts by weight, and is obtained by the following method: step one, fully stirring the synthetic oil, the polyethylene glycol and the glycerol with required amounts, adding the water with required amounts for shearing, and fully emulsifying to obtain a polymerization solvent; secondly, adding acrylamide, vinyl acetate, epichlorohydrin and N-vinylpyridine with required amounts into a polymerization solvent, and fully stirring and dissolving to obtain a mixed material; and thirdly, dissolving a required amount of catalyst in required amount of water to obtain a catalyst solution, then adding the catalyst solution into the mixture, stirring, shearing and carrying out polymerization reaction to obtain the high-temperature resistant nano latex plugging anti-collapse agent for the drilling fluid, wherein the catalyst is proline, and the synthetic oil is white oil and vegetable oil which are mixed according to the weight ratio of 7.
2. The high-temperature-resistant nano latex plugging and anti-sloughing agent for drilling fluid according to claim 1, wherein in the first step, the stirring time is 28min to 32min; or/and in the first step, the shearing temperature is 65-75 ℃, and the shearing time is 55-65 min.
3. The high-temperature resistant nano latex plugging anti-sloughing agent for drilling fluid according to claim 1 or 2, wherein in the third step, the reaction temperature is 65 ℃ to 75 ℃, and the reaction time is 2.8h to 3.2h; or/and in the third step, the catalyst is dissolved in 30 to 40 parts of water, the catalyst solution is added dropwise in a dropwise manner, and the dropwise adding time is 20 to 30min.
4. The preparation method of the high-temperature resistant nano-latex plugging anti-sloughing agent for drilling fluid according to claim 2 or 3, characterized in that the raw materials comprise 150 to 200 parts of synthetic oil, 35 to 50 parts of polyethylene glycol, 35 to 50 parts of glycerol, 70 to 100 parts of acrylamide, 200 to 250 parts of vinyl acetate, 250 to 300 parts of epichlorohydrin, 35 to 50 parts of N-vinylpyridine, 5 to 10 parts of catalyst and 90 to 120 parts of water by weight, and the method comprises the following steps: step one, fully stirring the synthetic oil, the polyethylene glycol and the glycerol with required amounts, adding the water with required amounts for shearing, and fully emulsifying to obtain a polymerization solvent; secondly, adding acrylamide, vinyl acetate, epichlorohydrin and N-vinylpyridine with required amounts into a polymerization solvent, and fully stirring and dissolving to obtain a mixed material; and thirdly, dissolving a required amount of catalyst in required amount of water to obtain a catalyst solution, then adding the catalyst solution into the mixture, stirring, shearing and carrying out polymerization reaction to obtain the high-temperature resistant nano latex plugging anti-collapse agent for the drilling fluid, wherein the catalyst is proline, and the synthetic oil is white oil and vegetable oil which are mixed according to the weight ratio of 7.
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| CN104403058A (en) * | 2014-10-31 | 2015-03-11 | 中国石油化工集团公司 | Latex plugging agent for drilling fluid and preparation method thereof |
| CN110172125A (en) * | 2019-04-16 | 2019-08-27 | 安徽中科日升科技有限公司 | A kind of nano-high molecule polymer latex, preparation method and applications |
| US10533122B1 (en) * | 2019-05-20 | 2020-01-14 | Southwest Petroleum University | Strong plugging drilling fluid composition and preparation method thereof, and use thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104403058A (en) * | 2014-10-31 | 2015-03-11 | 中国石油化工集团公司 | Latex plugging agent for drilling fluid and preparation method thereof |
| CN110172125A (en) * | 2019-04-16 | 2019-08-27 | 安徽中科日升科技有限公司 | A kind of nano-high molecule polymer latex, preparation method and applications |
| US10533122B1 (en) * | 2019-05-20 | 2020-01-14 | Southwest Petroleum University | Strong plugging drilling fluid composition and preparation method thereof, and use thereof |
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