Identification of Well Completion and Hydraulic Fracturing Performance Factors of Initial Development Wells within a Tight Oil Project in West China

Abstract The early development of a systematic approach to well completion practices centralized around multistage hydraulic fracturing treatments is often the critical component to sustainable reservoir exploitation and development. Unfortunately, the exploitation of either exploratory or underdeveloped resources often has a number of issues that include the understanding of geological heterogeneity with different results observed within close proximity and the need to optimize completion techniques to offset the potential rapid decline in well productivity. For these cases, well completion and stimulation practices are of utmost importance with the optimization and evaluation of such designs to include and account for the integration of all reservoir and geomechanical parameters. Recent vertical well results from initial exploratory wells combined with single-well horizontal pilot wells has accelerated the development plans for the Jimusaer field located in the Junggar basin of western China. This field covers a surface area of 300,000 acres with the targeted reservoir being located between 2,300 to 4,255 m true vertical depth (TVD). The application of horizontal wells from multiwell pads with each well consisting of up to 23 hydraulic fracturing treatments was meant to exploit large volumes of hydrocarbon reserves that were previously thought unattainable. Operationally, the first four wells consisted of 62 hydraulic fracturing stages and were executed within a 28-day period. The project included the application of an integrated workflow including reservoir characterization along the length of the horizontal well lateral, deployment of novel multistage openhole completion techniques with dissolvable isolation technology, factory fracturing approach with all stages being monitored by microseismic monitoring, and application of chemical tracers on selected stages to identify zonal contribution during flowback and cleanup operations. This paper describes how the acquisition of crucial reservoir and fracturing data combined with operational performance can identify areas for improvement of future completions while strengthening existing ones.

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Hydraulic Fracturing of Ultrahigh Stress Tight Oil Reservoir - A Case Study of Yumen Oilfield in China

10.2523/18752-ms ◽

2016 ◽

Author(s):

Peng Yi ◽

Weng Dingwei ◽

Xu Yun ◽

Wang Liwei ◽

Lu Yongjun ◽

...

Keyword(s):

Hydraulic Fracturing ◽

Tight Oil ◽

Oil Reservoir ◽

Tight Oil Reservoir

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Experimental Investigation on Enhanced-Oil-Recovery Mechanisms of Using Supercritical Carbon Dioxide as Prefracturing Energized Fluid in Tight Oil Reservoir

SPE Journal ◽

10.2118/202279-pa ◽

2021 ◽

pp. 1-16

Author(s):

Lei Li ◽

Zheng Chen ◽

Yu-Liang Su ◽

Li-Yao Fan ◽

Mei-Rong Tang ◽

...

Keyword(s):

Carbon Dioxide ◽

Water Resources ◽

Supercritical Carbon Dioxide ◽

Hydraulic Fracturing ◽

Clay Minerals ◽

Oil Production ◽

Tight Oil ◽

Injection Mode ◽

Oil Development ◽

Live Oil

Summary Fracturing is the necessary means of tight oil development, and the most common fracturing fluid is slickwater. However, the Loess Plateau of the Ordos Basin in China is seriously short of water resources. Therefore, the tight oil development in this area by hydraulic fracturing is extremely costly and environmentally unfriendly. In this paper, a new method using supercritical carbon dioxide (CO2) (ScCO2) as the prefracturing energized fluid is applied in hydraulic fracturing. This method can give full play to the dual advantages of ScCO2 characteristics and mixed-water fracturing technology while saving water resources at the same time. On the other hand, this method can reduce reservoir damage, change rock microstructure, and significantly increase oil production, which is a development method with broad application potential. In this work, the main mechanism, the system-energy enhancement, and flowback efficiency of ScCO2 as the prefracturing energized fluid were investigated. First, the microscopic mechanism of ScCO2 was studied, and the effects of ScCO2 on pores and rock minerals were analyzed by nuclear-magnetic-resonance (NMR) test, X-ray-diffraction (XRD) analysis, and scanning-electron-microscope (SEM) experiments. Second, the high-pressurechamber-reaction experiment was conducted to study the interaction mechanism between ScCO2 and live oil under formation conditions, and quantitively describe the change of high-pressure physical properties of live oil after ScCO2 injection. Then, the numerical-simulation method was applied to analyze the distribution and existence state of ScCO2, as well as the changes of live-oil density, viscosity, and composition in different stages during the full-cycle fracturing process. Finally, four injection modes of ScCO2-injection core-laboratory experiments were designed to compare the performance of ScCO2 and slickwater in terms of energy enhancement and flowback efficiency, then optimize the optimal CO2-injection mode and the optimal injection amount of CO2slug. The results show that ScCO2 can dissolve calcite and clay minerals (illite and chlorite) to generate pores with sizes in the range of 0.1 to 10 µm, which is the main reason for the porosity and permeability increases. Besides, the generated secondary clay minerals and dispersion of previously cemented rock particles will block the pores. ScCO2 injection increases the saturation pressure, expansion coefficient, volume coefficient, density, and compressibility of crude oil, which are the main mechanisms of energy increase and oil-production enhancement. After analyzing the four different injection-mode tests, the optimal one is to first inject CO2 and then inject slickwater. The CO2 slug has the optimal value, which is 0.5 pore volume (PV) in this paper. In this paper, the main mechanisms of using ScCO2 as the prefracturing energized fluid are illuminated. Experimental studies have proved the pressure increase, production enhancement, and flowback potential of CO2 prefracturing. The application of this method is of great significance to the protection of water resources and the improvement of the fracturing effect.

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The Use of Tracer Technologies for Well Monitoring with Multi-Stage Hydraulic Fracturing on Bolshetirskoye Oil Field

10.2118/206504-ms ◽

2021 ◽

Author(s):

Ivan Krasnov ◽

Oleg Butorin ◽

Igor Sabanchin ◽

Vasiliy Kim ◽

Sergey Zimin ◽

...

Keyword(s):

Hydraulic Fracturing ◽

Oil Recovery ◽

Hydraulic Fracture ◽

Horizontal Wells ◽

Pilot Project ◽

Oil Field ◽

Well Completion ◽

Construction Design ◽

Multi Stage ◽

Urgent Task

Abstract With the development of drilling and well completion technologies, multi-staged hydraulic fracturing (MSF) in horizontal wells has established itself as one of the most effective methods for stimulating production in fields with low permeability properties. In Eastern Siberia, this technology is at the pilot project stage. For example, at the Bolshetirskoye field, these works are being carried out to enhance the productivity of horizontal wells by increasing the connectivity of productive layers in a low- and medium- permeable porous-cavernous reservoir. However, different challenges like high permeability heterogeneity and the presence of H2S corrosive gases setting a bar higher for the requirement of the well construction design and well monitoring to achieve the maximum oil recovery factor. At the same time, well and reservoir surveillance of different parameters, which may impact on the efficiency of multi-stage hydraulic fracturing and oil contribution from each hydraulic fracture, remains a challenging and urgent task today. This article discusses the experience of using tracer technology for well monitoring with multi-stage hydraulic fracturing to obtain information on the productivity of each hydraulic fracture separately.

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Optimized Clay Control Fracturing Fluid Used in a Highly Water-Sensitive Tight Oil Reservoir Hydraulic Fracturing Application in Xinjiang Oil Field: Case Study

10.2118/205788-ms ◽

2021 ◽

Author(s):

Xinjun Mao ◽

Chaofeng Chen ◽

Renzhong Gan ◽

Shubo Zhou ◽

Zichao Wang ◽

...

Keyword(s):

Hydraulic Fracturing ◽

Recovery Rate ◽

Oil Field ◽

National Standard ◽

Working Fluid ◽

Tight Oil ◽

Fracturing Fluid ◽

Core Flow ◽

Velocity Sensitivity ◽

Highly Sensitive

Abstract The candidate wells are tight oil wells and most of the wells in the area have a low recovery rate of fracturing fluid after fracturing treatment. The lithology is glutenite with weak cementation and a high sensitivity tendency. This paper presents the process of sensitivity evaluation and fracturing fluid evaluation. Also, this paper introduces a customized and optimized clay control fracturing fluid wells in a highly sensitive reservoir. Per local national standard, traditional methods of swelling test (ST) and x-ray diffraction (XRD) were employed for qualitative formation cutting analysis. An innovative trial was then developed to evaluate cores quantitatively by water sensitivity. A clay stabilizer was then chosen to be used for the highly sensitive cores and regain permeability testing of the broken fracturing fluid was performed. Based on the analysis and evaluation, a customized treatment design was initiated for the hydraulic fracturing treatment. The qualitative evaluation showed the rock is highly water sensitive and the cores easily collapse because of weak cementation. No flow could be established during traditional core flow tests with brine. The newly developed method used kerosene as the working fluid to prevent the cores from contact with water or brine. The core flow tests resulted in a velocity sensitivity damage rate of 92%, which is considered as highly velocity sensitive. Accordingly, a special clay stabilizer was chosen to be used in the fracturing fluid and the permeability damage of the broken fracturing fluid is only 26.9%(Table 16). Field results have shown that the fracturing fluid recovery rate in treated wells is higher than the area average level and treated wells have significant oil production increase. The innovative clay control fracturing fluid and its field application reduces the influence of water and velocity sensitivity. The customized treatment with special clay stabilizer helps increase the recovery rate of fracturing fluid in reservoirs with severe clay stability and weak cementation issues.

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Multistage Hydraulic Fracturing of the Tyumen Suite Reservoirs of Em-Yogovskoye Field: Frac-Design, Practice, Results

10.2118/206651-ms ◽

2021 ◽

Author(s):

Mikhail Ivanovich Samoilov ◽

Vladimir Nikolaevich Astafyev ◽

Evgeny Faritovich Musin

Keyword(s):

Hydraulic Fracturing ◽

Modular Design ◽

West Siberia ◽

Field Development ◽

Well Completion ◽

Multistage Hydraulic Fracturing ◽

Sequence Of Events ◽

Multi Stage ◽

Development Plans ◽

Operational Decision Making

Abstract The paper describes a system of approaches to the design and engineering support of multistage hydraulic fracturing: A method of developing multiple-option modular design of multistage hydraulic fracturing which is a tool for operational decision-making in the process of hydraulic fracturing.Building a Hydraulic Fracturing Designs Matrix when optimizing field development plans. The result was used to build decision maps for finding well completion methods and selecting a baseline hydraulic fracturing design. The paper also describes how the systematization of approaches, methodological developments, and decision templates can help in optimizing field development by drilling directional and horizontal wells followed by multi-stage hydraulic fracturing. The sequence of events and tasks that led to the development of the methodology, as well as its potential, is briefly described. The methodologies were developed during the execution of a hydraulic fracturing project at JK 29 reservoirs of the Tyumen Suite of Em-Yogovskoye field, after which they were applied in a number of other projects for the development of hard-to-recover hydrocarbon reserves in West Siberia.

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A review of the current status of induced seismicity monitoring for hydraulic fracturing in unconventional tight oil and gas reservoirs

Fuel ◽

10.1016/j.fuel.2019.01.026 ◽

2019 ◽

Vol 242 ◽

pp. 195-210 ◽

Cited By ~ 38

Author(s):

Lei Li ◽

Jingqiang Tan ◽

David A. Wood ◽

Zhengguang Zhao ◽

Dirk Becker ◽

...

Keyword(s):

Hydraulic Fracturing ◽

Induced Seismicity ◽

Oil And Gas ◽

Current Status ◽

Tight Oil ◽

Gas Reservoirs ◽

Seismicity Monitoring ◽

Oil And Gas Reservoirs ◽

Tight Oil And Gas

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High Challenging Tight Oil Development by Integrating Innovative Reservoir Boundary Detection Technology into High Efficiency Horizontal Drilling Campaign in West China

10.2118/190998-ms ◽

2018 ◽

Cited By ~ 1

Author(s):

Jiafeng Zhang ◽

Chennai Zhi ◽

Jianxin Zhu ◽

Yiping Ye ◽

Tong Li ◽

...

Keyword(s):

High Efficiency ◽

Boundary Detection ◽

Tight Oil ◽

Horizontal Drilling ◽

West China ◽

Oil Development ◽

Detection Technology

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Evaluasi Stimulasi Hydraulic Fracturing Menggunakan Software Mfrac

Jurnal Offshore: Oil, Production Facilities and Renewable Energy ◽

10.30588/jo.v3i1.490 ◽

2019 ◽

Vol 3 (1) ◽

pp. 30

Author(s):

Novita Ratna Dila

Keyword(s):

Hydraulic Fracturing ◽

Simulation Software ◽

Productivity Index ◽

Service Company ◽

Step Rate ◽

Related Data ◽

Well Completion ◽

Before And After ◽

Calculation Results ◽

Rate Test

Perekahan hidraulik (hydraulic fracturing) merupakan suatu usaha untuk meningkatkan produktivitas suatu sumur dengan jalan membuat saluran konduktif bagi fluida produksi untuk mengalir dari reservoir menuju sumur. Keberhasilan dari pelaksanaan perekahan hidraulik ini dapat diketahui dari beberapa parameter. Adapun parameter keberhasilan tersebut diantaranya peningkatan permeabilitas formasi, peningkatan indeks produktivitas (PI) dan peningkatan laju produksi.Tujuan dari Perekahan hidraulik akan membahas evaluasi keberhasilan setelah perekahan hidraulik dilakukan, dimana yang menjadi acuan adalah kenaikan permeabilitas dan peningkatan laju produksi.Metodologi penelitian ini, menggunakan software MFrac Simulation dari Meyer & Associates, Inc. yang dimiliki oleh service company. Dengan memasukkan data reservoir, data lithologi batuan, data komplesi sumur, data proppant,data fluida perekah serta data-data lain yang terkait. Adapun tahap-tahap dari operasi stimulasi hydraulic fracturing ini meliputi step rate test, minifrac, evaluasi minifrac, dan main fracturing. Peningkatan produktivitas sumur terlihat sangat jelas dari hasil perbandingan productivity index (PI) sebelum dan sesudah hydraulic fracturing. Hasil perhitungan memperlihatkan bahwa dari hasil software Mfrac menunjukkan nilai PI naik 2,8126 kali lebih besar daripada PI sebelum hydraulic fracturing.Hydraulic fracturing is an attempt to increase the productivity of a well by making a conductive channel for the production fluid to flow from the reservoir to the well. The success of the implementation of hydraulic fracturing can be seen from several parameters. The success parameters include increasing formation permeability, increasing productivity index (PI) and increasing production rates. The purpose of hydraulic fracturing will be to discuss the success of the evaluation after hydraulic fracturing is done, where the reference is to increase permeability and increase the rate of production. The methodology of this research, using MFrac Simulation software from Meyer & Associates, Inc. owned by a service company. By entering reservoir data, lithological data of rocks, well completion data, proppant data, recycled fluid data and other related data. The stages of hydraulic fracturing stimulation operations include step rate test, minifrac, minifrac evaluation, and playing fracturing. Increased productivity of the well is very clear from the results of the comparison of productivity index (PI) before and after hydraulic fracturing. The calculation results show that from the Mfrac software results show the PI value increases 2.8126 times greater than the PI before hydraulic fracturing.

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