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Dagang, China

Liu T.-X.,China University of Petroleum - East China | Tao Z.-Q.,Dagang Oilfield Company
Zhongguo Shiyou Daxue Xuebao (Ziran Kexue Ban)/Journal of China University of Petroleum (Edition of Natural Science)

Based on the data from well drilling, geology, well logging and production performance, the reservoir architecture modeling of meandering river was researched using the method of multi-order bounding surface restriction and deterministic modeling in a block of Dagang Oilfield. Reservoir architecture model was established by the method of multi-order bounding surface restriction and limited the architecture element among bounding surfaces on the basis of the sedimentary microfacies model and point-bar architecture, then the reservoir parameter model was established using stochastic modeling under the restrictions of reservoir architecture on the basis of well data analysis. The results show that the space, dip angle and trend of lateral accretion interbeds on the scale, and they must be rectified using the well data during the modeling. The spatial distribution of lateral accretion bodies and lateral accretion interbeds are embodied well by the modeling method of multi-order bounding surface restriction. The attribute modeling under reservoir architecture restriction combines deterministic modeling with stochastic modeling, and the result can reflect the actual situation in the reservoir. Source

The development wells at the first region of Chenghai in Dagang oilfield are deviated wells basically, horizontal displacement of which is long, and the water ratio of vertical is high. Well completions in some of high angle wells are used of casing cementing, sand control screen pipe suspension, and independent screen sand control completion in easy sanding formation. Because sand control precision is single, screen is easily plug, and sand control effect is poor, the extrusion gravel packing sand control technology is the use of sand carrying fluid to squeeze the gravel packing method of near well-bore filled with a certain amount of gravel packing, the sieve and well-bore annulus with cyclic filling mode, multilevel sand barrier is formed, and sand prevention effect is good. At the same time, according to the geological the situation of Chenghai deviated wells area features and production of reservoir, and being optimized the construction parameters, the first successful implementation of Zhuanghai8Es-L8 well has been implemented successfully, which has a good effect, improves the high inclination well completion method, and makes true of high efficiency mining to development well. Source

The Cenozoic Qikou Sag is a typical extensional faulted basin. The faults' character and it's evolution played a key role in hydrocarbon accumulation. In this article we summarized the main characteristics of the faults, and demonstrated the role played by the faults on hydrocarbon conduction and seal process. We divided the Cenozoic faults into three fracture systems, and found that the faults characteristics, the structure style, the tectonic stress state coupling with hydrocarbon reservoir formation stages controlled the conducting or sealing state of the faults to the reservoir and finally formed three typical hydrocarbon reservoir formation modes. Source

Wei Z.,China University of Petroleum - East China | Chengyan L.,China University of Petroleum - East China | Minghui Z.,China University of Petroleum - East China | Helin W.,Dagang Oilfield Company
Petroleum Exploration and Development

Through building 3D geological models in different drilling time according to the logging while drilling (LWD) data and by updating the previous geological models, the dynamic updating of geological model could enable the acquisition of the spatial distribution of reservoir effectively and find the structural and occurrence changes instantly, so as to modify the former designed borehole track and adjust the drilling track by geosteering, and drill the oil layers in the best way. It can improve the effectiveness of horizontal interval and the drilling benefit. Combined with well logging, geological data and seismic data as well as the LWD data, this method was applied to the drilling of the Guanjiapu Oilfield, and the geological conditions were constrained by the multistage modeling method, to update and improve the Gamma Ray (GR), porosity and permeability models and the accuracy of reservoir random models, especially the sandstone distribution model to ensure the accuracy and reliability of the model. The drilling of Well Zh8-H has shown that the geosteering drilling capability was obviously improved in light of providing accurate geological model timely. © 2010 Research Institute of Petroleum Exploration & Development, PetroChina. Source

Xu P.,Petrochina | Xu P.,China University of Petroleum - East China | Cheng Y.,China University of Petroleum - East China | Liu X.,Petrochina | And 3 more authors.
Shiyou Kantan Yu Kaifa/Petroleum Exploration and Development

Based on the explosive fracturing simulation experiment for low permeability reservoir, growths of the cracks produced by the explosive fracturing in the samples were analyzed. And associated with fractal geometry theory, the cracks fractal characteristics were studied and the influences of explosive quantity and confining pressure on the cracks fractal dimension were analyzed. Different explosive quantities and confining pressures under which the simulation experiment was carried out were designed. After the experiment, the fractal dimension of the cracks produced by explosive fracturing in different samples was got by the box dimension calculation method. The results show that: With the increase of explosive quantity, the amount, length and width of the cracks on the surface of the sample produced by explosive fracturing simulation experiment under the same confining pressure increase. The amount and length of the cracks produced by explosive fracturing under the same explosive quantity decrease with the increase of confining pressure. Under the same confining pressure, the cracks fractal dimension increases with the increase of explosive quantity, and the relationship between them is approximately linear when the confining pressure is relatively low and approximately nonlinear when the confining pressure is relatively high. Under the same explosive quantity, the cracks fractal dimension decreases with the increase of confining pressure. It is suggested that site operation should match the explosive quantity with the confining pressure, and the charge pattern of axial coupling and radial uncoupling should be applied. Source

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