The release of encapsulated gel breaker is affected by many factors, including chemical reaction, time, temperature, etc. At the same time, it is affected by the formation conditions.
1. Osmotic release mechanism
Many encapsulated gel breaker are infiltrated with the extension of time or the increase of temperature. This encapsulated gel breaker has needle-like small holes in its capsule dressing. when dry, the gel breaker is stable and will not be released. When the gel breaker is added to the liquid, the water slowly penetrates through the small hole, so that the gel breaker is also slowly released from the small hole. Generally, the longer the time of the gel breaker in water, the larger the release amount, and the higher the temperature, the larger the release amount. A water-soluble membrane can be used so that the capsule dressing is gradually dissolved in water. Thus, the gel breaker is exposed and released.
2. Extrusion release mechanism
The encapsulated gel breaker and proppant are pumped into the formation during fracturing operation. It is stable and does not release the gel breaker. It does not cause a significant decrease in fracturing fluid viscosity. Due to fluid filtration and fracture closure, the proppant is concentrated and the pressure is reduced, but the proppant concentration makes the stress between the points in the proppant filling zone very large and extrude the gel breaker, causing the encapsulated gel breaker to deform, break and finally release the gel breaker.
The gel breaker will be released at local points and the gel breaker size must be larger than the void size of the proppant filling zone. Experiments show that the size of the gel breaker should be the same as the proppant size or slightly larger than the proppant size for the best effect.
Of the two release mechanisms, it is considered that the osmotic release mechanism is reliable, and the break time is easy to control, and the extrusion release mechanism can not be realized sometimes, because in the hole or under low pressure due to the flexibility of the capsule dressing the encapsulated gel breaker can not be crushed when the formation is closed, but the encapsulated gel breaker of this mechanism can be used in high pressure formation. Now it is generally believed that under low pressure, osmotic release is dominant; Under high pressure, extrusion release is dominant, and osmotic release also exists, but osmotic release is significantly aggravated at high temperature.
Weifang Toption Chemical Industry Co.,ltd is a professional manufacturer and supplier of ammonium persulphate re-granulated encapsulated gel breaker, If you need or if you are interested in our products, please visit our website www.toptionchem.com for more information , if you have any question, please do not hesitate to contact us.
Post time: Sep-19-2023