In the article presented 2 years of experience gained during multi-stage hydraulic fracturing (MSF) on 17 wells, by means of coiled tubing (CT) without lifting it to the surface, performed in years 2017 – 2018 on Vinogradova oilfield, KhMAO, Russia. In 2017 it was successfully implemented innovative technology, where fracturing operations are combined with coiled tubing (CT) operations and are run together with CT inside the well. Current method is based on operating reusable fracturing ports, where opening and closing is carried out using coiled tubing with subsequent performace of MSF along the CT/Tubing annulus. During these jobs, considerable experience was gained, the technologies were optimized and raised issues solved, including excessive abrasive wear of the coiled tubing pipe, leaks, etc. Vinogradova oilfield is a unique oil-saturated low-permeable reservoir with a small effective thickness, characterized by considerable stratification and gas-saturated porous layers. MSF technology demonstrated high efficiency and proved its reliability. Starting from February 2017 till June 2018 it was 17 wells accomplished, where 246 fracturings were carried out. All the wells were successfully commissioned. The implementation of innovative approaches to multi-stage hydraulic fracturing while coiled tubing remains in the well, resulted in 2-fold work time reduction, while the amount of frac ports doubled per well. The time frame of CT work between fracturing stages was minimized from 4 to 1.5 hours. During the job on one of the wells, it was encountered a leak in the completion (liner) in the shoe area, in order to continue MSF job, the isolation packer was run and temporary installed, which allowed to accomplish the operation. The performance of MSF technology without lifting coiled tubing to the surface proved its efficiency and economic feasibility, becoming more and more popular among operating companies, it has great potential for future implementation both in Russia and in the rest of the world. The area of distribution and application of MSF using CT is growing every year, the most relevant technology found in oil fringe with a gas cap or bottom water. The accumulated experience in this project creates the basis for the wide introduction and application of technology on other projects
The work describes the implemented techniques which help optimize reservoir engineering for tight oil deposits with the usage of multi-stage hydraulic fracturing by up-to-date methods of fracturing values’ evaluation. The work also identifies reasons of high water cut of well production after the multi-stage hydraulic fracturing at the V. Vinogradov field. The work also describes principles of preparing and implementing the optimum design of the multi-stage hydraulic fracturing under the conditions of unconstrained growth of the vertical component of the hydraulic fracture without any restraining barriers. After the set of operations, the quality of hydraulic fracture control increased and the well production water cut reduced.
The paper presents a study of field development optimization of the large tight oil field in West Siberia. The field is at an early development stage and is characterized by low permeability (less than 1 mD). It is developed by horizontal wells with multistage hydraulic fracturing. Analysis of available information about the field revealed the potential to improve field development efficiency. Field development analysis and optimization were carried out based on the experience of development of similar Canadian reservoirs. Two large fields were selected as analogues: Bakken ViewField and Pembina Cardium. The data on these fields is publicly available. These fields are developed during a long period of time enabling operating companies to learn from experience and use new knowledge and data to optimize completions systems and development strategies as a whole. Therefore it is possible to not only analyze the current field development stage, but also trace the evolution of approaches and assess, what benefits can be obtained from making various changes to the applied technologies and field development strategy. The positive experience of development of the Canadian fields formed the basis for the field development optimization options. A set of suggested project decisions will enable improvement in field development efficiency and, in case of confirming by pilot projects, can be recommended for full-field implementation in the considered field and in the analogue fields.
Very often it takes a great amount of time for a well commisimng. One of processes, costly on time, are geological and technical actions for increase of oil recovery of layer and also the subsequent development of a well. Especially for the reducing the time and the cost the fracturing stimulation method with coiled tubing has been developed. This method was used in one of the wells at Vladimir Vinogradov field in Khanty-Mansy Autonomous District. During experienced and production works, 16-stage fracturing in liner with sliding sleeves using coiled tubing has been carried out. Standard geological and technical actions include consecutive carrying out multistage fracturing with preliminary activation of each port, with the subsequent attraction of CT fleet for clean out and nitrogen lifting of a well. Activation of ports before the fracturing happens by activation balls (composite, aluminum, soluble) or by the special tool with involvement of CT fleet. The principle of described technology above is the following: after fracturing the first zone (from the bottomhole), the assembly is released using an auto mechanism and the whole BHA is moved to the next frac port, which is then opened with a mechanical shifting tool. The packer is actuated below the newly opened port to isolate previously treated intervals. The packer is set mechanically by coiled tubing moving up/down. After performed fracturing there are opportunities to make conventional normalization by pumping down thru coiled tubing or reverse circulation to remove proppant in case of screen-out. The job was successful. The total pumped volume was 960 tons of proppant, 60 tons per interval. All operations were completed in less than two weeks and without tripping out of the hole. Packer setting/release loads were within the acceptable for coiled tubing stress range. The fracturing was also performed with standard parameters. This innovating layout has significantly enhanced the efficiency of operations in comparison with the traditional method. For this project bottomhole assembly was upgraded for more safe works.
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