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A novel characterization and evaluation method of flow field and its application

A novel characterization and evaluation method of flow field...

引用

Abu dhabi International Petroleum Exhibition and Conference 2020, AdIP 2020

作者： Qiao, Yan Yang, Xiangtong Zhang, Yang Wang, Yonghong Hou, Tengfei Huang, Bo Shang, Litao Li, Huili CNPC Engineering Technology R&D Company Limited

ISBN: (纸本)9781613997345

At present, most of the oil fields in eastern China have entered the stage of high water cut development, with a comprehensive water cut of over 90% and an oil recovery of less than 30%. To improve oil recovery, the flow field must be described qualitatively and quantitatively, so as to provide a basis for the formulation of measures. This paper proposes two categories of indicators: one is a guideline for developing measures, including streamline bundle properties, and the other is an indicator for evaluating the effects of measures, remaining oil dispersion (rOd) and dynamic heterogeneity included. Through numerical simulation methods, the regularity research and adaptive evaluation of each flow field characterization indicator are carried out. Finally, according to the streamline bundle properties of block E, the liquid rate of injection and production wells were optimized, and the effectiveness of the optimization was evaluated. The study found that under the condition of fixed well pattern, the streamline bundle flow (SF) between wells is relatively stable, and the change in streamline bundle potential (SP) and streamline bundle oil cut (SOC) tends to decrease with time. The typical curve of rOd generally includes four stages, and the effectiveness of measures is judged by the trend of rOd. For dynamic heterogeneity, the change curve generally includes unstable stage and stable stage. The value of the stable stage value can reflect the heterogeneity of the flow field. The larger the value, the stronger the heterogeneity of the flow field. According to the streamline bundle properties, three liquid rate optimization strategies, which are streamline bundle flow method (SFM), streamline bundle potential method (SPM), and streamline bundle oil cut method (SOM), are proposed, and the effectiveness of the measures is evaluated using rOd and dynamic heterogeneity. After liquid rate optimization, the rOd of the reservoir in Block E increased and decreased later, the Lo

关键词： Flow fields

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Implementing managed pressure drilling technique in drilling an offshore exploration well

Implementing managed pressure drilling technique in drilling...

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Offshore technology Conference Asia 2020, OTCA 2020

作者： Cai, Xiao Guo, Qingfeng Zhao, Qing CNPC Engineering Technology R&D Company Limited

ISBN: (纸本)9781613996812

The managed pressure drilling technique has been widely applied in land to solve different technical and well control issues as well as ensuring the safety of field personnel. Offshore exploration drilling is one of the most challenging operations due to its nature of drilling hazards and facing environment. There is a great need of applying managed pressure technique in offshore drilling. A new MPd equipment is developed, which is named as pressure control drilling system (PCdS), and performs its first application in offshore drilling to reach its further potential. The PCdS is applied in an exploration well located in the gulf of Bohai to perform a near-balanced drilling operation for the purpose of reducing the density of drilling fluid. It utilizes the microflux control technique to precisely monitor the wellbore condition and detect the overflow and loss of circulation in time. The technique of constant bottom hole pressure is used by the PCdS to maintain the bottom hole pressure constant and minimize the fluctuations of bottom hole pressure during making connections and round trip, enhancing the drilling performance. The equivalent circulating density of 1.08-1.09 g/cm3 is obtained by the proposed PCdS using the solid-free drilling fluid with a density of 1.03g/cm3. While nearby wells use the drilling fluid with the density of 1.15-1.20 g/cm3 at the same Stratum. Cooperated with the drilling fluid of lower density, utilization of the proposed pressure control drilling system significantly avoids the formation damage. The chip hold-down effect is minimized by the proposed PCdS to increase the rOP. The average rOP of nearby wells is 4.02 m/h. While the average rOP of the well using the proposed PCdS is 7.23 m/h, indicating the increase of 80 percent. With the assistance of the proposed PCdS, the drilling team set a single bit footage record of 312.88 m and daily footage record of 163 m, which demonstrates a great improvement of operation efficiency. No drilling

关键词： drilling fluids

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research on engineering technologies to develop China's complex reservoirs and their feasibility in development of marginal oilfields in South America

Research on engineering technologies to develop China's comp...

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Offshore technology Conference Brasil 2019, OTCB 2019

作者： Fu, Jin Wang, Xi Zhang, Shunyuan Liu, Bingshan Chen, Chen Yang, Guobin CNPC Engineering Technology R&D Company Ltd

ISBN: (纸本)9781613996713

Marginal Oilfields are refered to as those oilfields that are hardly developed efficiently with current technical and ecomonical conditions, characterized as high costs of development and low profit margins. However, under certain economical and technical circumstances, marginal oilfields may be transferred to be conventional ones. Since Petrobras developed the first ever offshore deep reservoir (Lula) by scale in 2006, Brazil has been conducting a progressive campaign targeting hydrocarbons buried under deep water, which contributes to discovery of Lula, Carioca, Jupiter, Buzios, Libra and other giant presalt reservoirs in Santos Basin. cnpc signed a cooperation contract with Petrobras in 2013, taking 10% of the total shares. How to efficiently develop the oilfield has been a challenging issue. Technologies of smart water injection in Shengli Oilfield have been studied, while the field development and environment (deep water) of Libra Oilfield have been analyzed, in order that the smart water injection technologies may be modified to develop the marginal oilfield more efficiently. different from conventional zonal water injection technologies, the remote wireless control water injection technologies take advantages of packers that are connected with each other via preset cables, which achieves downhole testing and water injection simultaneously. Being run via tubing, the water injection string locates a nozzle for each reservoir that is isolated by a packer. All nozzles are connected with packers via the preset cables that work as power lines for the whole string, so that downhole data such as pressures, flows and temperatures are all transferred to the processing computer on the surface. The computer program is used to convert pressure and formation signals into curves that are transferred to company via WIFI or mobile 2G/3G/4G webs, in order that technicians there may understand and learn about downhole pressures, temperatures, flows and nozzle conditions in real

关键词： Offshore oil well production

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Technical and risk assessment of underground gas storage construction and operation in China and Caspian region

Technical and risk assessment of underground gas storage con...

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SPE russian Petroleum technology Conference 2019, rPTC 2019

作者： Fu, Jin Wang, Xi Chen, Chen Chen, Haowei Zhang, Shunyuan Liu, Bingshan CNPC Engineering Technology R&D Company Ltd

ISBN: (纸本)9781613996928

Since China proposed "Belt and road" initiative in 2013, Caspian countries have become a crucial region for oil and gas cooperation. However, it has been a common technical issue to develop presalt oil and gas resevoirs in the world. Caspian region is known for the wide-spread thick salt-gypsum formations. In China some old wells that were depleted due to engineering difficulties arising from presalt formations started to be developed as underground gas storages. The crude oil price has been keeping at a low level in recent years, which made China's government put more efforts in the development of underground oil storages in depleted salt caverns. As the largest project of underground gas storages, Jintan gas storage construction project successfully made best use of depleted salt caverns. A Sonar test was applied on 4 Jintan underground salt caverns that are 900m deep and 1000m away from the surface in order to reveal their shapes. Salt and muddy salt rocks were collected in Jintan as samples to be analyzed in 3-axis pressure tests. Numerical results with finite element method (FEM) code ABAQUS were studied to approach the creep behaviors of caverns and rock pillars. The pressure arch model and the most dangerous sliding surface model were both utilized to optimize geometric parameters of the upper and lower walls of dissolved cavities. Creep happens on salt rocks under deviator stress, which has non-linear relationship with time. In the simulated gas storage process the internal pressure went up to 14.0 MPa within 3 months but dropped to 7.0MPa in the following 3 months. The above condition may last for 9.5 years in real scenarios. Surrounding rocks of caverns deformed during construction but the most obvious creep was found at their tops and bottoms. Within 10 years salt pillars between caverns are under high deviator stress, thus their creep is the most serious. Surrounding rocks become unstable as the internal pressure of caverns decreases. The creep scope of

关键词： Caves

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research on radial drilling technology of high efficient rock breaking under high temperature deep well conditions

Research on radial drilling technology of high efficient roc...

引用

Abu dhabi International Petroleum Exhibition and Conference 2020, AdIP 2020

作者： Chen, Zhi Zhu, Feng Hu, Qiangfa Zhang, Youjun Lv, Weiping CNPC Engineering Technology R&D Company Limited

ISBN: (纸本)9781613997345

The current radial well operation technology can not adapt to high temperature, and the long tripping period and low drilling efficiency in deep well *** to the characteristics of abrasive jet, a new radial drilling method is proposed in this paper, in which the abrasive jet is conveyed to the underground by CT (coiled tubing), the casing is sidetracked first, and then the formation is drilled. The working procedure is that using the CT to run the positioning and guiding tool in hole first, and then using the CT to run a steel tube in hole. When the steel tube reaches the deflector, it makes a radial turn, and the ground equipment transfers the abrasive drilling fluid to down hole through the CT. during the operation, the casing sidetracking is completed with drilling fluid with high abrasive concentration, then the abrasive concentration is reduced, and the steel tube enters the formation to complete the radial drilling. Practice has proved that when the well temperature exceeds 100°C the jet hose is easy to be damaged under high temperature and high pressure environment, resulting in leakage of drilling fluid and unable to complete the operation normally. It is necessary to select a suitable temperature-resistant jet hose. Practice has proved that when the well depth is more than 4000 meters, the pressure loss along the system increases and the jet water power from the nozzle decreases. For hard formation, the water jet is not enough for rock breaking drilling in the formation. The results show that under the same water power condition, abrasive jet has stronger ability to break rock and penetrate hard stratum than water jet because it contains solid particles with higher hardness and density. At the same time, the abrasive water jet with suitable abrasive concentration and water power can be used for casing sidetracking. The casing sidetracking and formation drilling are combined to simplify the process. Experiments show that the types of abrasiv

关键词： rocks

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BIONIC ANd dUAL-PHOBIC HIGH-PErFOrMANCE WATEr-BASEd drILLING FLUId

BIONIC AND DUAL-PHOBIC HIGH-PERFORMANCE WATER-BASED DRILLING...

引用

作者： JIANG, Guancheng SUN, Jinsheng HE, Yinbo ZHANG, Xin PENG, Chunyao dONG, Tengfei TAN, Bin GENG, Tie YANG, Lili LUO, Xiaohu LUO, Xuwu LIANG, Xing CHEN, Changwei LIU, Xiaobo CHENG, rongchao LUO, Jiansheng ZHANG, Jianguo WANG, Yong FU, daqi rAN, Qifa ZHAO, Li CUI, Kaixiao NI, Xiaoxiao

标准号: EP4155364(A1)

The present invention relates to the field of petroleum industry phase oilfield chemistry, and specifically relates to a bionic and dual-phobic drilling fluid. The drilling fluid contains a bionic wall-fixing agent, a bionic lubricant, a super dual-phobic agent, a scrap-carrying agent and a bionic shale inhibitor. The present invention uses the theory of bionics and the theory of a downhole rock surface being double phobic as a basis. By means of using the bionic wall-fixing agent, the bionic lubricant, the super dual-phobic agent, the scrap-carrying agent and the bionic shale inhibitor, which have special properties of imitating animals and plants in nature, and using a series of bionic treatment agents, a set of bionic and dual-phobic drilling fluid systems, which corresponds to an unconventional, complex oil and gas well, is formed.

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Production-induced Stress in Nonhomogeneous Shale Gas reservoirs 55

Production-induced Stress in Nonhomogeneous Shale Gas Reserv...

引用

55th U.S. rock Mechanics / Geomechanics Symposium 2021

作者： dong, J.N. Jin, G.T. Liu, T.E. Qiu, K.X. Wei, S.M. CNPC Engineering Technology R&D Company Limited Beijing102206 China Peking University Beijing102249 China Beijing102249 China

ISBN: (纸本)9781713839125

The mechanical properties of shale are greatly influenced by the fraction of organic matter in the shale. However, the effects of organic matter distribution on stress interference have not been well considered. Since parent- wells target "sweet spots,"infill wells (child wells) generally target an area with a lower porosity and permeability, which correspond to a higher organic matter content. This study investigates the influence of organic matter distribution on changes in horizontal principal stress. For the scenario with nonuniformly distributed organic matter, the infill well region is set as the organic-rich region. A fully coupled numerical model considering the whole flow spectrum of shale gas and the shrinkage of organic matter is built. Some conclusions are drawn from the simulation results;for example, the shrinkage of organic matter enlarges the alteration angle of the maximum horizontal principal stress orientation and the magnitude of the minimum horizontal principal stress. However, the effect of organic matter on the alteration angle of the maximum horizontal principal stress is basically negligible after 3 years of production. The magnitude and orientation of the horizontal principal stresses experienced more modest changes in the infill well region with nonuniformly distributed organic matter than in that with uniformly distributed organic matter. Copyright © 2021 ArMA, American rock Mechanics Association.

关键词： Shale gas

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Identification of shale bedding layers from micromechanical evaluation

Identification of shale bedding layers from micromechanical ...

引用

SPE Annual Technical Conference and Exhibition 2021, ATCE 2021

作者： Cheng, Shizhong Sheng, Mao Chen, Zhaowei Tian, Shouceng Li, Gensheng State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum-Beijing China CNPC Engineering Technology R&D Company Limited

ISBN: (纸本)9781613997864

Bedding layers are well-developed in shale and recognized to enhance the complexity of the hydraulic fracture network. A micromechanical evaluation approach of shale bedding layers based on indentation testing techniques was proposed. rock thin section identification and scanning electron microscope were utilized to describe the shale laminations. To capture high-resolution image with large area and ensure abundant morphology and mineral information, Atlas 5 system, which could create large mosaic images, was applied. Combined with FIB, a method for positioning the laminations in SEM and accurately navigate to it in the micromechanics experiment was established. Fractures were emphasized to be initiated and extend in the clay mineral layers. It can be explained that the flaky structure of clay mineral is beneficial for the extension of fracture. It will become more potential to connect with the fluid-driven fractures. Nanoindentation was conducted to obtain micromechanical properties in different lamination layers. results verify the feasibility of this scheme and demonstrate fine-grained, transition and coarse-grained layers. Indentation results show variation in micromechanical properties of coarse-grained layer, the transition layer and the fine-grained layers. The present work is helpful to identify shale bedding layers from micromechanical evalutions. © 2021, Society of Petroleum Engineers

关键词： Shale

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Flow numerical simulation of tubing or casing leakage in gas well

Flow numerical simulation of tubing or casing leakage in gas...

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Abu dhabi International Petroleum Exhibition and Conference 2020, AdIP 2020

作者： Zhang, Hong Yuan, Guangjie Li, Guotao Li, Jingcui Wan, Jifang Fu, Pan CNPC Engineering Technology R&D Company Limited Research Institute of Petroleum Exploration and Development CNPC Engineering Technology R&D Company Limited

ISBN: (纸本)9781613997345

Tubing or casing leakage of HTHP gas wells and underground gas storage wells affects wellbore integrity adversely. The wellbore micro-leakage detection technology can detect tiny fluid leakage in time and is of great significance to avoid malignant gas leakage accident. The theoretical basis of wellbore microleakage detection technology is characterizing the leakage flow field. To reveal the flow characteristics of gas leakage due to tubing and casing cracks and perforations, a CFd model of gas aperture leak has been established and flow field numerical simulation of high-speed and high-pressure gas outflow through aperture was conducted. The standard k-e turbulence model was used to calculate and analyze the pressure and velocity distribution of the steady flow field. In addition, a time step was set on the steady-state model and the Scale-Adaptive Simulation (SAS) model was adopted to simulate the transient flow field with the initial conditions of the steady-state simulation results. The effects of the shape and size of the leakage hole, the pressure inside the pipe, and the medium in the outer annular space on the flow field were analyzed. The results show that obvious turbulence disturbance appears near the inlet of the leakage hole and supersonic under-expansion jet forms near the outlet of the leakage hole under the gas well working conditions, creating the expansion wave and shock wave. The flow velocity of gas leakage through the circular hole is the highest, while that of the slot hole is the lowest under the same conditions. The larger the leakage aperture is, the greater the pressure difference between inside and outside of the pipe is, and the more drastic variation of gas velocity in the leakage hole. The method and results provide theoretical guidance for the microleakage detection technology of gas well wellbore. © 2020, Society of Petroleum Engineers

关键词： Flow fields

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Key technology of drilling Speed Increase and deviation Control in Inclined Formation of Bongor Basin in Chad 12th

Key Technology of Drilling Speed Increase and Deviation Cont...

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12th International Field Exploration and development Conference, IFEdC 2022

作者： Zhong, Zhao Zhong, Hong-Wei Gu, Yi-Xin Li, Xiao-Gang Ji, Fei Xiao, Yue Li, Gan-Lu Wang, Yin-Ze CNPC Engineering Technology R and D Company Limited Beijing102206 China China National Oil and Gas Exploration and Development Corporation Beijing100034 China BGP Inc China National Petroleum Corporation Zhou072751 China

ISBN: (纸本)9789819919635

Bongor basin is the main oilfield of cnpc, and P formation is the main exploration layer. Under the strong fault depression in the early Cretaceous, the dip angle of M and P formation is large with frequent lithology change, which makes it difficult to anti-deviation in drilling process. Moreover, r, K, M and P formations contain flint, so the rOP is low and the bit consumption is large. In order to control well deviation effectively and improve rOP, based on the analysis of formation characteristics and lithology, the fast drilling and anti-deviation technologies focusing on motorâ€‰+â€‰MWd, torque impactor and T-type PdC bit for inclined formation in Bongor basin of Chad are innovated, and field application were carried out. The results show that the wellbore quality of the applied well section meets the requirements of the industry standard. Compared with the conventional BHA, the average deviation is reduced by 57.31%, the average rOP in φ311.2 mm and φ241.3 mm borehole increased by 51.04% and 47.28% respectively. Moreover, the bit consumption of single well is reduced by 37.45%, which provides reference and guidance for high efficient drilling operation in inclined formation of Bongor basin in Chad. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2023.

关键词： Lithology

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