STUDY AND SIMULATION OF MULTI-LAYERED HYDRAULIC FRACTURE BY APPLYING THE LIMITED ENTRY TECHNIQUE

• Main Author: (NIM : 22208039), SUWANDA
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/24437
• Institution: Institut Teknologi Bandung

For a drilled well which intersects with more than one productive zones, the operation of hydraulic fracturing requires special consideration in order to create an optimum fracture in every layer. This technique is called a Multiple- Layered Hydraulic Fracture (MLF) which has been successfully applied in many production wells throughout the world. One of the issues that may occurs in a process simultaneous multi-layered fracturing is how to predict and control the distribution of injection rate through every zone of interest. <br /> <br /> In this Thesis, several techniques which are commonly applied in multilayered fracturing will be covered. Case study is done by designing and analyzing a simultaneous multi layered fracturing in an oil well that has three productive layers. The simulation is executed by using a pseudo 3-D geometry model. <br /> <br /> Limited entry technique is, then, applied in the simulation to control the ratio of fluid distribution. Moreover, optimization is done separately for every layer in order to determine the hydraulic fracture length which creates the highest NPV value. Sensitivity studies are done by analyzing the effect of geometry model, thickness of formation and the use of several fracturing fluid in multiple layer hydraulic fracturing. <br /> <br /> For a production time of 5 years, the results of the simulation show that the optimum hydraulic fracture length of layer 1 is 240 ft with the NPV of US$ 1.704 million. For layer 2, the optimum hydraulic fracturing length is obtained at 206 ft with the NPV of US$ 597 thousand. The optimum hydraulic fracture of layer 3 is 270 ft with the NPV of US$ 1.250 million. <br /> <br /> By designing and placing the perforation properly, the limited entry technique which is applied in the multiple hydraulic fracture gives the desired fluid distribution ratio. Eventually, the targets of optimum fracture length for every layer are obtained. From this study, the author conclude that factors which affect the ratio of fluid injection rate are the in-situ stress, the formation height and the effect of near wellbore. In the multi layered fracturing, controlling the fluid distribution is the major key that ensures the successful of the treatment.