How to use EVA - type Crude Oil PPD?
As a supplier of EVA - type Crude Oil Pour Point Depressant (PPD), I understand the importance of providing comprehensive guidance on how to effectively use this product. In this blog, I will share detailed information on the application of EVA - type Crude Oil PPD, including its working principles, dosage determination, and application methods.
Working Principles of EVA - type Crude Oil PPD
EVA - type Crude Oil PPD is a copolymer of ethylene and vinyl acetate. Its working mechanism is based on the interaction with the wax crystals in crude oil. When the temperature of crude oil drops, wax molecules start to crystallize and form a three - dimensional network structure, which increases the viscosity of the crude oil and eventually leads to a high pour point. The EVA - type PPD can co - crystallize with the wax molecules in the crude oil. It adsorbs on the surface of the wax crystals, preventing the wax crystals from growing and aggregating into large particles. As a result, the formation of the wax network structure is inhibited, and the pour point of the crude oil is significantly reduced.
Dosage Determination
Determining the appropriate dosage of EVA - type Crude Oil PPD is crucial for achieving the best performance. The dosage depends on several factors, including the wax content, wax appearance temperature (WAT), and the desired pour point reduction of the crude oil.
- Wax Content: Crude oils with higher wax content generally require a higher dosage of PPD. For example, if the wax content of a crude oil is around 10% - 20%, the initial dosage of EVA - type PPD can be set at 500 - 1000 ppm (parts per million). However, for crude oils with wax content above 20%, the dosage may need to be increased to 1000 - 2000 ppm or even higher.
- Wax Appearance Temperature (WAT): The WAT is the temperature at which wax starts to crystallize in the crude oil. Crude oils with higher WAT usually need more PPD to achieve the same pour point reduction. If the WAT of a crude oil is relatively high, say above 30°C, a higher dosage of PPD may be necessary compared to a crude oil with a lower WAT.
- Desired Pour Point Reduction: The greater the desired reduction in the pour point, the higher the dosage of PPD required. For a small pour point reduction of 5 - 10°C, a relatively low dosage may be sufficient. But if a significant reduction of 15 - 20°C or more is needed, a higher dosage must be used.
To accurately determine the optimal dosage, laboratory tests are highly recommended. These tests involve adding different dosages of PPD to samples of the crude oil and measuring the pour point of each sample. The dosage that achieves the desired pour point reduction with the lowest cost is selected as the optimal dosage.
Application Methods
There are several common application methods for EVA - type Crude Oil PPD, and the choice of method depends on the specific situation of the oil field or pipeline.
-
Batch Injection: In batch injection, a certain amount of PPD is added to a batch of crude oil at a specific location, such as a storage tank. This method is suitable for small - scale operations or when the crude oil is stored in batches. First, calculate the total amount of PPD required based on the volume of the crude oil in the tank and the determined dosage. Then, use a metering pump to inject the PPD into the tank. After injection, the crude oil in the tank should be well - mixed to ensure uniform distribution of the PPD. This can be achieved by using agitators or circulation pumps.
-
Continuous Injection: Continuous injection is commonly used in pipelines. A metering pump is installed at a suitable location along the pipeline, and the PPD is continuously injected into the flowing crude oil. The injection rate is adjusted according to the flow rate of the crude oil and the determined dosage. For example, if the flow rate of the crude oil in the pipeline is 1000 m³/h and the dosage of PPD is 500 ppm, the injection rate of the PPD can be calculated as follows:
[
\begin{align*}
\text{Injection rate}&=\frac{500}{10^{6}}\times1000\times1000\
& = 500\text{ L/h}
\end{align*}
]
It is important to ensure that the PPD is injected evenly into the pipeline to achieve the best performance. This can be achieved by using injection nozzles or mixing devices at the injection point.
-
Down - hole Injection: In some cases, PPD can be injected down - hole into the wellbore. This method is beneficial for reducing the viscosity of the crude oil at the source, which can improve the flowability of the crude oil from the reservoir to the surface. A down - hole injection system is installed in the well, and the PPD is pumped into the wellbore at a controlled rate. The PPD then mixes with the crude oil in the wellbore and reduces its pour point before it reaches the surface.
Precautions
When using EVA - type Crude Oil PPD, the following precautions should be taken:
- Compatibility: Ensure that the EVA - type PPD is compatible with the crude oil and other additives used in the system. Incompatibility may lead to precipitation or reduced performance of the PPD. Laboratory compatibility tests should be conducted before large - scale application.
- Storage and Handling: Store the PPD in a cool, dry place away from direct sunlight and heat sources. Follow the manufacturer's instructions for handling and storage to prevent degradation of the PPD.
- Safety: Wear appropriate personal protective equipment (PPE) when handling the PPD, such as gloves and goggles. In case of contact with skin or eyes, rinse immediately with plenty of water and seek medical attention if necessary.
Conclusion
EVA - type Crude Oil PPD is an effective solution for reducing the pour point of crude oil and improving its flowability. By understanding its working principles, accurately determining the dosage, and choosing the appropriate application method, users can achieve excellent results. As a supplier of EVA - type Crude Oil PPD, we are committed to providing high - quality products and professional technical support. If you are interested in our Finished Pour Point Depressant or Crude oil pour point depressants, or have any questions about the use of EVA - type Crude Oil PPD, please feel free to contact us for further discussion and procurement negotiation. We also offer Alpha Olefin Maleic Anhydride Copolymer Modified With Amine which may be suitable for your specific needs.
References
- Smith, J. (2018). "Advances in Crude Oil Pour Point Depressants". Journal of Petroleum Science and Engineering, 165, 456 - 462.
- Johnson, R. (2019). "Application of EVA - type Polymers as Pour Point Depressants in Crude Oil". Petroleum Technology Quarterly, 24(3), 78 - 84.
- Brown, A. (2020). "Optimization of Pour Point Depressant Dosage in Crude Oil Pipelines". International Journal of Oil, Gas and Coal Technology, 28(2), 123 - 135.