Modified oxidized asphalt and preparation method thereof
By adding polymer materials and active calcium powder to natural asphalt, modifying oxidized asphalt is solved, and the problem of insufficient suspension and gelatinization of oxidized asphalt materials in oil-based drilling fluid is achieved, and a lower filtration loss is achieved and better use effect to meet the needs of different oil-based drilling fluids.
Patent Information
- Application Number
- CN202411197610.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-29
- Publication Date
- 2024-12-17
AI Technical Summary
The existing oxidized asphalt materials have poor suspension and gel formation in oil-based drilling fluid, resulting in poor water loss effect of drilling fluid and large loss of high temperature and high pressure filtration, resulting in problems such as drilling fluid loss and drilling layer collapse.
By adding polymer materials, activated calcium powder and activator to natural asphalt, a modified oxidized asphalt is prepared to improve its gelatinization and water loss performance. The specific steps include grinding treatment, sieving and dry powder blending and mixing , the mixed products show efficient precipitation and filtration loss control in different oil-based drilling fluids.
At a system temperature of 150°C, at 4% addition amount, the loss of high-temperature and high-pressure filtration is controlled at ≤5mL, which is relatively low in cost and has better use effect than similar products.
Smart Images
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Figure BDA0005016930230000041
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of oilfield drilling materials, and specifically refers to a modified oxidized asphalt and a preparation method thereof. Background Art
[0002] Existing oxidized asphalt materials or modified natural asphalt materials on the market have poor suspension and gelling properties in oil-based drilling fluids such as diesel or white oil, and the mud cake layer formed is not compact enough, resulting in poor drilling fluid water loss reduction effect, and the high temperature and high pressure filtration loss is generally above 10mL. During the drilling process, if the drilling fluid has a high filtration loss, it will cause serious loss of drilling fluid, damage the drill layer, and even cause collapse and other negative situations. Therefore, it is necessary to improve the temperature resistance, dispersibility and gelling properties of oxidized asphalt through surface modification and other methods to improve the application effect of this material in oil-based drilling fluids. However, simple surface modification cannot meet the requirements of the increasingly developed drilling fluid water loss reduction additives. Therefore, there is an urgent need for a low-cost modified oxidized asphalt filtration reduction agent product that meets the needs of different oil-based drilling fluids. Summary of the invention
[0003] The object of the present invention is to provide a modified oxidized asphalt with low cost and meeting the requirements of different oil-based drilling fluids and a preparation method thereof.
[0004] In order to achieve the above functions, the technical solution adopted by the present invention is as follows: a modified oxidized asphalt, which is composed of 16% polymer material, 15% active calcium powder, 5% activator and 64% natural asphalt in terms of mass percentage.
[0005] Preferably, the polymer material consists of SBR, polystyrene rubber powder and C5 petroleum resin, which account for 8%, 5% and 3% of the total respectively.
[0006] Preferably, the active calcium powder is a calcium powder material modified by a silane coupling agent.
[0007] Preferably, the activator is a zinc oxide material.
[0008] Preferably, the natural asphalt has a colloid content of more than 20% and an oil solubility of more than 80%.
[0009] The present invention also discloses a method for preparing modified oxidized asphalt, comprising the following steps:
[0010] (1) Grinding polymer materials, active calcium powder, activator and natural asphalt;
[0011] (ii) sieving the powder in step (i) using a 200-mesh sieve;
[0012] (iii) Mix all the sieved powders in step (ii) by dry powder blending, with the mixing time being 25-35 minutes.
[0013] The passing rate of the mixed product in step (iii) through a 200-mesh sieve is above 80%, and the passing rate through a 100-mesh sieve is above 90%. When the product is added to a 5% 3# white oil solution and stirred for 5 minutes and allowed to stand for 1 hour, the precipitation rate is ≤20%.
[0014] The present invention adopts the above scheme to achieve the following beneficial effects: a modified oxidized asphalt and a preparation method thereof provided by the present invention, by adding different types of polymer materials, active calcium powder, and activator materials to natural asphalt, while the cost does not change much, through the compatibility and synergy between the materials, the gelling property and water loss reduction performance of the natural asphalt material are improved. For example, at a system temperature of 150°C for white oil-based drilling fluid, an addition amount of 4% can control the high-temperature and high-pressure filtration loss to ≤5mL, which has lower cost and better use effect than similar drilling fluid asphalt products. DETAILED DESCRIPTION
[0015] The technical solution of the present invention is described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0016] Example
[0017] The invention discloses a modified oxidized asphalt, which is composed of 16% of polymer material, 15% of active calcium powder, 5% of activator and 64% of natural asphalt in terms of mass percentage, wherein the polymer material is composed of SBR, polystyrene rubber powder and C5 petroleum resin, and respectively accounts for 8%, 5% and 3% of the total amount, the active calcium powder is a calcium powder material modified by a silane coupling agent, the activator is a zinc oxide material, and the natural asphalt has a colloid content of more than 20% and an oil solubility of more than 80%.
[0018] The present invention also discloses a method for preparing modified oxidized asphalt, comprising the following steps:
[0019] (1) Grinding polymer materials, active calcium powder, activator and natural asphalt;
[0020] (ii) sieving the powder in step (i) using a 200-mesh sieve;
[0021] (iii) Mix all the sieved powders in step (ii) by dry powder blending for 30 min.
[0022] The passing rate of the mixed product through a 200-mesh sieve is more than 80%, and the passing rate of a 100-mesh sieve is more than 90%. In a 5% 3# white oil solution, the product is added, stirred for 5 minutes, and allowed to stand for 1 hour, and the precipitation rate is ≤20%.
[0023] The following are the effects of using modified oxidized asphalt in different diesel or white oil-based drilling fluids:
[0024] Diesel-based drilling fluid organic soil system: 0# diesel 210mL + heat-resistant polyfatty acid amide emulsifier 7.5mL + 25% CaCL2 solution 90mL + calcium hydroxide 4.0g + organic bentonite 4.5g + modified oxidized asphalt 8.0g + barite 170g, heat aging at 150℃ for 16h:
[0025] project Index requirements Experimental data Is it satisfied? Demulsification voltage V >500 550 yes Density, kg / m3 1200-1500 1320 yes Apparent viscosity 40-80 69 yes Plastic viscosity 20-40 33 yes Dynamic cutting 15-30 20 yes Final Cut >5 7 yes 150℃ Filtration loss ≤6.0 4.5 yes
[0026] White oil-based drilling fluid organic soil system: 3# white oil 180mL + heat-resistant polyfatty acid amide emulsifier 8.0mL + 25% CaCL2 solution 76mL + calcium hydroxide 5.0g + organic bentonite 5.0g + modified oxidized asphalt 8.0g + barite 220g, heat aging at 150℃ for 16h:
[0027]
[0028]
[0029] White oil-based drilling fluid without soil phase system: 3# white oil 180mL + Span 80 emulsifier 4.0g + 25% CaCL2 solution 80mL + calcium hydroxide 10.0g + modified oxidized asphalt 12g + barite 100g, heat aging at 130℃ for 16h:
[0030] project Index requirements Experimental data Is it satisfied? Apparent viscosity 15-25 17 yes Plastic viscosity 15-25 18 yes Dynamic cutting 5-10 8.5 yes 150℃ Filtration loss ≤5.0 4.0 yes Final Cut >3 3.5 yes
[0031] The present invention and its embodiments are described above, and such description is not restrictive. What is shown in the embodiment is only one of the embodiments of the present invention, and is not actually limited thereto. In short, if ordinary technicians in the field are inspired by it and design embodiments similar to the technical solution without creativity without departing from the purpose of the invention, they should all fall within the protection scope of the present invention.
Claims
1. A modified oxidized asphalt, characterized in that: The composition thereof by mass percentage is: 16% of polymer material, 15% of active calcium powder, 5% of activator and 64% of natural asphalt.
2. The modified oxidized asphalt according to claim 1, characterized in that: The polymer material consists of SBR, polystyrene rubber powder and C5 petroleum resin, which account for 8%, 5% and 3% of the total respectively.
3. The modified oxidized asphalt according to claim 1, characterized in that: The active calcium powder is a calcium powder material modified by a silane coupling agent.
4. The modified oxidized asphalt according to claim 1, characterized in that: The activator is zinc oxide material.
5. The modified oxidized asphalt according to claim 1, characterized in that: The natural asphalt has a colloid content of more than 20% and an oil solubility of more than 80%.
6. A method for preparing a modified oxidized asphalt according to claims 1 to 5, characterized in that: The steps include: (1) Grinding polymer materials, active calcium powder, activator and natural asphalt; (ii) sieving the powder in step (i) using a 200-mesh sieve; (iii) Mix all the sieved powders in step (ii) by dry powder blending, with the mixing time being 25-35 minutes.
7. The method for preparing a paste of modified oxidized asphalt according to claim 6, characterized in that: The passing rate of the mixed product in step (iii) through a 200-mesh sieve is above 80%, and the passing rate through a 100-mesh sieve is above 90%. When the product is added to a 5% 3# white oil solution and stirred for 5 minutes and allowed to stand for 1 hour, the precipitation rate is ≤20%.