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Research into magnetic guidance technology for directional drilling in SAGD horizontal wells

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petroleum Science 2013年第4期10卷 500-506页

作者： Gao Deli Diao Binbin Wu Zhiyong Zhu Yu state key laboratory of petroleum resource & prospecting MOE Key Laboratory of Petroleum Engineering China University of Petroleum

SAGD horizontal wells are used to enhance oil recovery from heavy oil *** technology requires precise separation between the production well and the injection well to ensure the efficient drainage of the *** studying the attitude of the downhole probe tube and the production well trajectory,an algorithm is proposed for eliminating ferromagnetic interference while drilling injection wells.A high accuracy filter circuit has been designed to correct the detected magnetic signals,which are ultra-weak,frequency-instable,and *** directional drilling magnetic guidance system（DD-MGS） has been developed by integrating these advanced *** contains a sub-system for the ranging calculation software,a magnetic source,a downhole probe tube and a sub-system for collecting ＆ processing the detected *** DD-MGS has succeeded in oilfield *** can guide the directional drilling trajectory not only in the horizontal section but also in the build section of horizontal injection *** new technology has broad potential applications.

关键词： Heavy oil SAGD horizontal wells directional drilling magnetic guidance system

Corrections for downhole NMR logging

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petroleum Science 2012年第1期9卷 46-52页

作者： Hu Haitao Xiao Lizhi Wu Xiling state key laboratory of petroleum resource and prospecting China University of PetroleumBeijing 102249China

Nuclear magnetic resonance logging （NMR） is an open well logging method. Drilling mud resistivity, formation resistivity and sodium ions influence its radio frequency （RF） field strength and NMR logging signals. Research on these effects can provide an important basis for NMR logging data acquisition and interpretation. Three models, water-based drilling mud--water bearing formation, water- based drilling mud--oil bearing formation, oil-based drilling mud--water bearing formation, were studied by finite element method numerical simulation. The influences of drilling mud resistivity and formation resistivity on the NMR logging tool RF field and the influences of sodium ions on the NMR logging signals were simulated numerically. On the basis of analysis, RF field correction and sodium ion correction formulae were proposed and their application range was also discussed. The results indicate that when drilling mud resistivity and formation resistivity are 0.02 Ω·m and 0.2 Ω·m respectively, the attenuation index of centric NMR logging tool is 8.9% and 9.47% respectively. The RF field of an eccentric NMR logging tool is affected mainly by formation resistivity. When formation resistivity is 0.1 Ω·m, the attenuation index is 17.5%. For centric NMR logging tools, the signals coming from sodium ions can be up to 31.8% of total signal. Suggestions are proposed for further research into NMR logging tool correction method and response characteristics.

关键词： NMR logging finite element method RF field NMR signal formation resistivity sodium ions

Calculating standard captured γ spectra of formation elements

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petroleum Science 2012年第4期9卷 463-468页

作者： Wu Wensheng Xiao Lizhi Zhang Lijuan Niu Wei state key laboratory of petroleum resource and prospecting China University of PetroleumBeijing 102249China

Multi-element gamma-ray spectrum logging requires standard spectra of individual elements for its *** the standard element spectra are usually derived using Monte Carlo simulation of either a pure element or its oxide,we synthesized the standard neutron captured γ spectra（as would be observed using a NaI（Tl） detector） of elements H,Si,Ca and Fe from each element and its *** compare the standard spectra from the elements and oxides,we operated three simulations of sandstone,limestone and mixed formation of sandstone and limestone each with ten different porosities,and used the two kinds of standard spectra to analyze the mixed spectra modeled from sandstone and limestone *** results show that the standard element spectra from oxides have more prominent energy peaks than the standard spectra from pure *** calculated formation element contents are close to the theoretical values when the standard element spectra from oxides are used to analyze the formation mixed ***,the formation element standard spectra should be calculated from oxide models in the analysis of neutron captured γ spectra by logging tools.

关键词： Standard spectrum spectrum analysis neutron captured γ spectrum formation element

Sandbox modeling of fault formation and evolution in the Weixinan Sag, Beibuwan Basin, China

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petroleum Science 2012年第2期9卷 121-128页

作者： Tong Hengmao state key laboratory of petroleum resource and prospecting China University of PetroleumBeijing 102249China

Fault formation and evolution in the presence of multiple pre-existing weaknesses has not been investigated extensively in rift basins. The fault systems of Weixinan Sag, Beibuwan Basin of China, which is fully covered with high-precision 3-D seismic data and is rich in oil-gas resources, have been successfully reproduced by sandbox modeling in this study with inclusion of multiple pre-existing weaknesses in the experimental model. The basic characteristics of fault formation and evolution revealed by sandbox modeling are as follows. 1） Weakness-reactivation faults and weakness-related faults are formed much earlier than the distant-weakness faults （faults far away from and with little or no relationship to the weakness）. 2） Weakness-reactivation faults and weakness-related faults develop mainly along or parallel to a pre-existing weakness, while distant-weakness faults develop nearly perpendicular to the extension direction. A complicated fault system can be formed in a fixed direction of extension with the existence of multiple pre-existing weaknesses, and the complicated fault system in the Weixinan Sag formed gradually in a nearly N-S direction with multiple pre-existing weaknesses. 3） The increase in the length and number of faults is closely tied to the nature of pre-existing weaknesses. The sandbox model may provide a new clue to detailed fault system research for oil and gas exploration in rift basins.

关键词： Fault system rift basin multiple pre-existing weaknesses Weixinan Sag sandbox modeling

Research and application of water jet technology in well completion and stimulation in China

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petroleum Science 2010年第2期7卷 239-244页

作者： Li Gensheng Huang Zhongwei Tian Shouceng Shen Zhonghou state key laboratory of petroleum resource and prospecting China University of petroleum Beijing 102249 China

In recent years, rapid progress in the use of high pressure water jets （HPWJ） has been made in oil and gas well drilling, completion, and stimulation; and good results have been achieved in field applications. Advances in technologies and developments of well completion and stimulation with hydrajet are reviewed in this paper. Experiments were conducted to study the characteristics of abrasive water jetting and to optimize jet parameters, which can provide methods for the well completion and hydrajet fracturing. Deep-penetrating hydrajet perforating can create a 2-3 m clean hole with a diameter of 20-35 mm. Multilayer hydrajet fracturing is a process whereby multiple layers are stimulated in a single run without using mechanical packers, thereby reducing operation procedure and risk. Multilateral radial wells can be drilled using hydraulic jetting up to 100 m in length. The technique to remove sand particles and plugs with rotating self-resonating cavitating water jets in horizontal wellbores has been developed and oilfield-tested, which shows promising, cost effective prospects.

关键词： Water jet abrasive jet well completion perforation stimulation horizontal drilling with hydrajet

Sensor design and implementation for a downhole NMR fluid analysis laboratory

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petroleum Science 2012年第1期9卷 38-45页

作者： Wu Baosong Xiao Lizhi Li Xin Yu Huijun An Tianlin state key laboratory of petroleum resource and prospecting China University of PetroleumBeijing 102249China

This paper tries to build a multi-functional downhole nuclear magnetic resonance （NMR） fluid analysis laboratory that can evaluate fluid information in real time at reservoir conditions at a depth of several thousand meters. The aim is to monitor the pollution of the formation fluids and quantitatively evaluate NMR characteristics of the fluids. It focuses on the design of the structure and parameters of a sensor with zero stray fields. Two separate coils are designed to measure NMR characteristics of flowing or static fluids. A method is proposed to use the Bloch equation, to guide the optimization of the NMR sensor. Finally, the measured results confirm that the design is reasonable. There is a homogeneous static field （perpendicular to the axial direction） in the center of the sensor, and there are no stray external fields. The novel design of pre-polarization magnet improves the signal to noise ratio, while shortening the sensor length.

关键词： NMR fluid analysis laboratory magnet Bloch equation

Organic petrology and hydrocarbon generation of potential source rocks in Permian formation of Junggar Basin,Northwest in China

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Journal of Central South University 2013年第6期20卷 1693-1702页

作者：秦黎明张枝焕 SINOPEC Research Institute of petroleum Engineering state key laboratory for petroleum resource and prospecting(China University of petroleum)

From the outcrops in the Yaomoshan and Hongyanchi sections, oil shales, deep dark mudstones or black mudstones with better organic richness were found. Through the analysis of the samples in the organic petrology method, the microscope features of the sedimentary organic matter were studied. The results indicate that three types of kerogens present in the measured samples. Kerogen type I consists of the laminate algainite, abundant sporinite and only little content of cutinite, which can mainly generate oil. The generation hydrocarbon components of the type II kerogen are dominated by the sporinite, cutinite and little the exinite debris. The type III kerogen is comprised of the sporinite and debris of the exinite with some components of gas generation. Through the analysis of the experiments, the organic kerogen of the Lucaogou formation is mostly comprised of the type I, partially type II, and particularly type III. In Hongyanchi formation, the organic type is mixed by the types II and III. The plot of the （$1＋$2） or TOC value and the content of exinite show two trends. From the evolution of burial and the Permian source rocks in Changji Depression, the Permian formation source rock has ended the generation of hydrocarbon. A significant difference in constituents of the organic macerals among three kerogens in these samples leads to the distinction of the potential hydrocarbon generation. The Lucaogou formation for kerogen type I has better potential hydrocarbon generation. It can reach the oil peak with Ro ratio Of 0.9%. For the kerogen II, the oil peak of the source rocks comes late with the Ro ratio of 1.0% with less quantity of the generation hydrocarbon than the kerogen I. For type III, it can mainly generate gas and reach the gas peak with the Ro ratio of 1.3%. In a word, the Lucaogou formation and Hongyanchi formation source rocks with high organic richness in Permian source rocks have well exploration prospects.

关键词： organic macerals hydrocarbon generation potential Permian source rocks southern Junggar Basin

Coupled effects of stress damage and drilling fluid on strength of hard brittle shale

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Journal of Central South University 2016年第12期23卷 3256-3261页

作者：汪伟邓金根蔚宝华郑小锦闫传梁邓月 state key laboratory of petroleum resources and prospecting China University of Petroleum

During well drilling process,original stress state of hard brittle shale will be changed due to stress redistribution and concentration,which leads to stress damage phenomenon around the ***,drilling fluid will invade into formation along the tiny cracks induced by stress damage,and then weaken the strength of hard brittle *** on this problem,a theoretical model was set up to discuss damage level of shale under uniaxial compression tests using acoustic velocity *** specifically,considering the coupled effect of stress damage and drilling fluid,the relationship between hard brittle shale strength and elapsed time was analyzed.

关键词： hard brittle shale stress damage drilling fluid time effect strength

Free Radicals in Organic Matter for Thermal History Reconstruction of Carbonate Succession

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Acta Geologica Sinica(English Edition) 2007年第4期81卷 605-613页

作者： QIU Nansheng LI Huili JIN Zhijun and ZHU Yinkang 1 state key laboratory of petroleum resource and prospecting,China University of petroleum,Beijing 102249 2 Basin and Reservoir Research Center,China University of petroleum,Beijing 102249 3 Institute of petroleum Exploration and Development,SINOPEC,Beijing 100083 state key laboratory of petroleum resource and prospecting China Universityof Petroleum Beijing 102249

Geothermometer is one of the most useful methods to reconstruct the thermal history of sedimentary basins. This paper introduces the application of free radicals concentration of organic matter as a thermal indicator in the thermal history reconstruction of carbonate succession, based on anhydrous thermal simulation results of type I and H1 kerogen. A series of free radicals data are obtained under thermal simulation of different heating temperatures and times, and quantitative modds between free radical concentration （Ng） of organic matter and time-temperature index （TTI） for types I and type H1 kerogen are also obtained. This *** relation was used to model the Ordovician thermal gradients of Well TZ12 in the Tarim Basin. The modeling result is corresponding to the results obtained by apatite fission track data and published data. This new method of thermal history reconstruction will be benefit to the hydrocarbon generation and accumulation study and resource assessment of carbonate succession.

关键词： carbonate succession geothermometer free radicals of organic matter apatite fission track thermal history