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Utilizing Dynamic Data to Quickly Evaluate Advantageous Channels and Applications

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World Journal of Engineering and Technology 2023年第3期11卷 417-423页

作者： Jianguo Liu Rui Zhang Zheng Lv Meinan Wang Guohao Zhang Tianjin branch of cnooc ltd. Tianjin China

In response to the high cost and difficulty of high-speed development and testing data in offshore oil fields, this paper proposes to use the most easily available production performance data as the basis and use the grey correlation method to calculate the correlation coefficient between oil and water wells to characterize the degree of development of advantageous channels. The consistency between the calculated results of this method and the tracer test results is over 80%. Based on the fitting results, the correlation coefficient exceeds 0.74 to determine the existence of an advantageous channel. According to the research results of grey correlation method, Bohai K oilfield has completed the combined profile control and flooding measures, and the daily oil production has increased by 20 m3/d. This method is simple, fast, and can achieve quantitative evaluation, which saves time and investment compared to offshore testing. It has strong application and reference value for the development of other offshore water injection oilfields.

关键词： Offshore Oil Fields Production Performance Correlation Coefficient Advantageous Channel Quantitative Assessment

Identification of Interlayer in Strong Bottom Water Reservoir and Its Influence on Development Effect

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Journal of Geoscience and Environment Protection 2022年第7期10卷 132-138页

作者： Jie Tan Jianbo Chen Zhang Zhang Chunyan Liu Wentong Zhang Tianjin branch of cnooc ltd. Tianjin China

X oilfield is located in Bohai Sea area, in which G oil formation is a typical drape anticline structure, which is composed of multiple sets of thick sandy conglomerate and multiple sets of argillaceous intercalation. From the perspective of development effect, muddy interlayer has a great impact on the oilfield. In this paper, through core identification and well logging identification, the electrical discrimination standard is summarized to identify the interlayer. Through statistics and analysis of the production performance of actual wells, the influence of muddy interlayer on the development performance of oil wells is summarized. This study provides guidance for the development of strong bottom water reservoirs with interlayer.

关键词： Strong Bottom Water Reservoir Drape Anticline Structure Interlayer Identification Development Effect

Study on Remaining Oil at High Water Cut Stage of the Offshore Strong Bottom Water Reservoir

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Journal of Geoscience and Environment Protection 2023年第6期11卷 76-82页

作者： Jie Tan Zhang Zhang Tingli Li Jingmin Guo Mo Zhang Tianjin branch of cnooc ltd. Tianjin China

C oilfield is a heavy oil field developed by horizontal wells and single sand body in Bohai oilfield. The edge and bottom water of the reservoir is active and the natural energy development mode is adopted. The comprehensive water cut of the oilfield was 95.3%, which had entered the stage of high water cut oil production. Some reservoirs were limited by crude oil viscosity and oil column height. Under the condition of existing development well pattern, some reserves were not produced or the degree of production was low, and the degree of well control was not high, so there is room for tapping the potential of remaining oil. This paper studied the rising law of water ridge of horizontal wells in bottom water reservoir by reservoir engineering method, and guided the infilling limit of horizontal wells in bottom water reservoir. At the same time, combined with the research results of fine reservoir description, the geological model was established, the numerical simulation was carried out, and the distribution law of remaining oil was analyzed. Through this study, we could understand the law of water flooding and remaining oil in the high water cut period of bottom water heavy oil reservoir, so as to provide guidance for the development strategy of this type of reservoir in the high water cut period.

关键词： Bohai Oilfield Heavy Oil Reservoir Flooding Law Remaining Oil

Aliphatic biomarker signatures of early Oligocene-early Miocene source rocks in the central Qiongdongnan Basin:Source analyses of organic matter

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Acta Oceanologica Sinica 2023年第3期42卷 1-18页

作者： Min Xu Dujie Hou Xiong Cheng Jun Gan Xinde Xu Gang Liang Wenjing Ding School of Energy Resources China University of GeosciencesBeijing 100083China Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Accumulation Mechanism Ministry of EducationBeijing 100083China Beijing Key Laboratory of Unconventional Natural Gas Geological Evaluation and Development Engineering Beijing 100083China Exploration and Development Resource Institute Hainan Branch of China National Offshore Oil CorporationHainan 570300China China National Offshore Oil Corporation(cnooc)Research Institute Co. Ltd.Beijing 100028China

The geochemical signatures of fifty-four rock samples and three supplementary drill stem test(DST)oils from the Yacheng-Sanya formations in the central Qiongdongnan Basin(CQB)were *** of the early Oligocene-early Miocene(36–16 Ma)palaeovegetation and source analyses of organic matter(OM)were conducted using aliphatic biomarkers in ancient sediments and DST *** the interpreted aquatic and terrigenous OM contributed to the CQB source rocks(SRs)but had varying relative *** four distribution patterns derived from n-alkanes,terpanes,and steranes are representative of four OM composition models of the Yacheng-Sanya SRs,including model A,model B,model C,and model D,which were classified based on the increasing contribution from terrigenous OM relative to aquatic *** terrigenous higher plantderived biomarkers,including oleanane,des-A-oleanane,C_(29)ααα20R sterane,bicadinanes,the C_(19)/(C_(19)+C_(23))tricyclic terpane ratio,and other n-alkane-derived ratios suggest that angiosperms had increased proportions in the palaeoflora from early Oligocene to early Miocene,and the bloom of terrigenous higher plants was observed during deposition of upper Lingshui Formation to lower Sanya *** findings are consistent with the incremental total organic carbon and free hydrocarbons+potential hydrocarbons(S_1+S_2)in the lower Lingshuilower Sanya strata with a significant enrichment of OM in the E_3l_1-N_1s_2 *** maturity-and environmentsensitive aliphatic parameters of the CQB SRs and DST oils suggest that all the samples have predominantly reached their early oil-generation windows but have not exceeded the peak oil windows,except for some immature Sanya Formation *** addition,most of the OM in the analysed samples was characterised by mixed OM contributions under anoxic to sub-anoxic ***,terrestrial-dominant SRs were interpreted to have developed mainly in the Lingshui-Sanya formations and were deposit

关键词： aliphatic biomarkers early Oligocene-early Miocene organic matter sources palaeovegetation reconstruction Qiongdongnan Basin

Quantitative Characterization of Interlayer Interference in Multi-Layered Sandstone Reservoirs Offshore China

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Open Journal of Geology 2022年第12期12卷 1093-1101页

作者： Xinwei Jin Liuhe Yang Donghao Wu Mengying Zhu Shan Gao Yong Jia Tianjin branch of cnooc ltd. Tianjin China

X oilfield is a typical multi-layer sandstone reservoir in offshore China. In the early stage, in order to obtain economic oil production, directional well was used to adopt a set of multi-layer combined production, which resulted in serious interlayer interference, water injection inrush and low reserve utilization. Based on the theory of single-phase unstable seepage flow and the theory of oil-water two-phase non-piston displacement, the author innovatively established a mathematical model of interlayer dynamic interference in multilayer sandstone reservoirs, revealed the influence law of main controlling factors such as permeability, viscosity, starting pressure gradient and reservoir type on interlayer interference, and innovatively formed a quantitative characterization theory of interlayer interference in multilayer combined oil production. The technical demarcation of offshore multi-zone combined oil production reservoir system is formulated and the recombination of oil field development system is guided.

关键词： Multi-Zone Sandstone Reservoir Interlayer Interference Single-Phase Unstable Seepage Two-Phase Non-Piston Displacement

Research on Water Sensitivity and Velocity Sensitivity of Loose Sandstone Reservoir in China Offshore Oilfield

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World Journal of Engineering and Technology 2022年第2期10卷 254-263页

作者： Dengfei Yu Ming Long Yuejie Wang Qin Huang Jingling Li Tianjin branch of cnooc ltd. Tianjin China

Aiming at the development characteristics of Bohai P oilfield, formation mechanism of reservoir damage was analyzed by mines of mineral composition, micro-pore structure, and seepage mechanism. Microscopic petrological observations and laboratory core experiments show that the content of clay minerals such as the Imon mixed layer and kaolinite is high with high porosity and good pore roar structure;the water sensitivity is medium to strong, The lower the salinity of injected water, the greater the drop in core permeability;the velocity-sensitive damage is strong, and permeability increases with the increase in flow velocity, and a large number of particles are observed in the produced fluid under the microscope. Aiming at the contradiction of velocity sensitivity between core permeability increase and the permeability decrease near the wellbore, the velocity sensitivity seepage model of “long-distance migration and blockage near the well” is proposed, and the permeability and formation distribution formula are deduced. The calculated value is close to the test value of actual pressure recovery test. The research results of water sensitivity and velocity sensitivity provide important guidance for Bohai P oilfield to improve production and absorption capacity and reservoir protection.

关键词： Reservoir Damage Water Sensitivity Velocity Sensitivity Loose Sandstone Seepage Mechanism Clay Minerals

Research on Pore Pressure-Depth Characteristics in Normal Pressure Reservoir, Bohai Sea Oilfield

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Journal of Geoscience and Environment Protection 2022年第4期10卷 101-110页

作者： Pengfei Mu Qiongyuan Wu Mingzhe Cui Geng Qian Bo Zhang Tianjin branch of cnooc ltd Tanggu Tianjin China

In normal pressure of reservoir, formation pressure and depth can not fully reflect the linear relationship between the formation pressure with depth, the change rule of reservoir measured formation pressure and often reduced pressure, understanding unclear cause fluid properties. By introducing basic principles of hydrostatics. The relationship between pressure coefficient and mathematical depth is discussed by mathematical induction analysis of measured pressure data of nearly 50 normal pressure reservoirs in Bohai Oilfield. The results show that the reservoir pressure data is linearly distributed with depth, and the pressure coefficient is inversely proportional to depth. When the depth becomes shallower, the pressure coefficient increases and approaches the reservoir level. As the depth increases, the pressure coefficient decreases and approaches the hydrostatic pressure coefficient infinitely. The study can more accurately analyze the reservoir pressure changes, which is helpful to study the oil and water distribution, reservoir connectivity and fluid properties of atmospheric pressure reservoirs.

关键词： Bohai Basin Normal Reservoir Pressure Wireline Formation Tester Pressure Coefficient Inverse Proportion Function

Study on Horizontal Well Layout Boundary Considering Wellbore Pressure Loss

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Open Journal of Yangtze Oil and Gas 2023年第1期8卷 11-17页

作者： Xinwei Jin Yong Hu Juan Du Fengyu Yan Xiaoning Ren Tianjin branch of cnooc ltd. Tianjin China

Based on the Dikken analytical calculation method of wellbore pressure loss under single-phase fluid and turbulent flow conditions, the correlation model between horizontal well output and horizontal section length and horizontal section distributed pressure difference is constructed. The influence degree of wellbore pressure loss on daily oil production of horizontal well, horizontal section pressure and production effect of horizontal well under different horizontal well lengths is analyzed, which provides certain reference for the design of horizontal well length and well layout.

关键词： Horizontal Well Wellbore Pressure Loss Length of Horizontal Section

Research on Identification Method of Argillaceous Interlayer in Compound Sand

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Open Journal of Geology 2023年第5期13卷 337-344页

作者： Yue Xie Liqin Gan Jingfu Deng Zhanhua Zhang Guanshan Yan Tianjin branch of cnooc ltd. Tianjin China

For the compound sand body, the interlayer is an important factor affecting the adjustment of oil production structure and remaining oil distribution. According to the origin of argillaceous interlayer, the interlayer is divided into three types, including barriers between two single layers, intercalations between two single sands and intercalations in a single sand. In this study, the upper limit of physical properties of interlayer was obtained by analyzing the relationship between physical parameters and production index per-meter. The discriminant index and comprehensive discriminant chart of interlayer were obtained by grey correlation method, which realize the quantitative identification of different types of interlayer. The intercalations between two single sands in the target area are distributed almost in the whole area, which is one of the most important factors influencing the mining effect of compound sand, so the planar distribution is mainly aimed at it. Firstly, through cross-well comparison, we summarize three interlayer patterns, then establish their forward modeling, so as to obtain the vertical seismic characteristics of different patterns. Secondly, according to the thickness of intercalations between two single sands, we take the top of bottom sand as the baseline, extract the average amplitude attribute from the upper and lower 3 ms, then, according to the seismic section and planar characteristics of the well, the interlayer structures represented by different seismic section and planar characteristics are summarized. Finally, starting from the real drilling interlayer of the well, the planar spread of interlay can be obtained according to their variation trend and distribution.

关键词： Compound Sand Interlayer Quantitative Identification The Planar Distribution of Interlay