Advanced Materials Research Vols. 616-618

Abstract: In this paper, a whole fractured curve data model management framework is proposed, which defines all kinds of components which integrates many functions, such as fractured curve data parsing, uploading, curve data managing, curve querying and curve playbacking and so on. By means of meta-data, a kind of meta-data data model is constructed which is employed to describe fractured curve formation, makes the architecture model possessing scalability. The architecture model proposed is able to solve complicated fractured curve data management issue, the system has been applied to Daqing field.

Abstract: When pressure is low enough in pipeline the transported liquid vaporizes, and air can be let into the pipeline for various of reasons. After the pipeline is shut down, the air/vapor will gather and cavitation occurs. The existence of cavity in liquid pipeline is harmful when restarting the pipeline because the downstream equipments may not work properly. When the cavity collapse, the unsteady flow pattern in pipeline may be intensified due to the sudden increase of pressure and temperature, which may cause serious accidents. Analysis and calculation for the hydraulic status in gas concentrated liquid pipeline are presented in this paper using the rigid liquid column theory. A new type of protective device which automatically let in and release gas is designed by the author. The device is awarded the national patent of utility model.

Abstract: In accordance to Coalbed Methane(CBM) low productivity and environment problem in China, the experiments of displacing CBM by injecting carbon dioxide and nitrogen were researched respectively. The adsoption/desorption disciplines of Carbon Dioxide(CO2), Methane(CH4) and Nitrogen(N2) in coalbed were studied with experiment; the mechanism of CBM displacing by CO2 and N2 injection and enhancing recovery were also researched. The results show that gases with higher critical temperature have stronger adsorption under the same pressure and desorption lag occurs during desorption process. Under the same volume and pressure condition, CO2 has stronger adsorption ability ,thus enhancing the CH4 productivity in the pore surface of coalbed; N2 mainly enters into macro-pore and decrease the pressure of CH4 in the constant pressure condition, the effect of methane adsorption decreases, then CH4 is displaced. With the injection flow of CO2 increasing, the productivity is enhanced correspondingly. However, the productivity could not be enhanced anymore after a certain amount of gas injection

Abstract: Asphaltene deposition problems occurred in many oil fields in worldwide, which maybe block up wellbore, damage the permeability of reservoir and decline oil productivity. There are many factors to result asphalthene deposition problems, which contain crude component, pressure, temperature and so on. However, it cannot prevent asphaltene deposition problems completely by keeping formation pressure higher than bubble pressure based on the research. Studying the deposition affecting factors, determining the deposition occurring conditions and depth are the basis to resolve the problems. This paper presents the key factor of affecting asphaltene deposition, and based on near infrared measurement, shows the asphaltene deposition envolope curve to forecast the pressure, temperature and depth in tube when the asphaltene deposition happened. The paper also provides methods to calculate the lowest production rate to carry the asphaltene solids to surface and forecast the deposition depth.

Abstract: Energy control (i. e. pressure control) has an obvious effect on development effect in the depletion of gas condensate reservoir. Phase change behavior and characteristics of the relative pemeability in gas condensate reservoirs were displayed in this paper, then pressure and condensate distribution were showed through reservoir simulation. Finally, the influence of the pressure drop on condensate distribution and condensate oil production in gas condensate reservoirs with different permeabilities was studied. Results show that: First, in high / moderate permeability gas condensate reservoirs, the pressure and the condensate blocking will extend to further reservoir, while the pressure and condensate just appear in the vicinity of wellbore in low permeability gas condensate reservoirs. Second, the influence of pressure drop on condensate distribution in high permeability gas condensate reservoirs is obvious, the condensate blocking extends with the increasing of the pressure drop, and condensate extent can be controlled by optimizing a rational pressure drop, while the influence is inconspicuous in low permeability gas condensate reservoirs. Third, the influence of pressure drop on condensate oil production in high / moderate permeability gas condensate reservoirs is conspicuous, a rational pressure drop exists, while the influence is indistinct in low permeability or tight gas condensate reservoirs, before the retrograde condensation, a low pressure drop should be adopted in a long term until the bottom hole flowing pressure drops below the dew point pressure, when the condensate blocking forms, well stimulation is advised before developing by pressure control.

Abstract: The transient flowing model of slotted liner completion was established by superposition principle based on the geometric model of slotted liners, with the point source function and the single slotting equal to line source, and then the optimized model of slotted liner completion parameter was established with the skin factor of slotted liners completion as evaluation index. After analyzing the parameter sensitivity with cases, the slot density is confirmed as the main reason leading to flow convergence and additional flow resistance. Furthermore, the optimization principles of slotted liners completion of horizontal well are determined. These results are significant in optimizing the slot distribution pattern and parameter allocation.

Abstract: This template explains and demonstrates how to prepare your camera-ready paper for Describing the distribution of remaining oil quantitatively by applying geological reserve abundance has been put forward this paper, which can avoid the one-sidedness when describing the remaining oil by remaining oil saturation, so as to provide reliable basis for tapping the potential of remaining oil. By using this method in the study of remaining oil in the west of South-eight Block, the effectiveness of measures used for tapping the potential of remaining oil has been enhanced and the development effect also has been obviously improved. Therefore, this method has certain significance to the description of the remaining oil.

Abstract: Types of found reservoirs and its distribution characteristics of Putaohua oil layer in the Sanzhao Sag were analyzed. The controlling factors of hydrocarbon distribution were investigated. Sanzhao Sag is Sag-wide oil-bearing, but its distribution of oil and water is extremely complicated. The reservoir types are mainly fault block reservoirs, low amplitude structure reservoirs, fault-lithologic reservoirs and lithologic reservoirs. The distribution of reservoirs is mainly controlled by three geological factors: first, long-term inherited nose-like structure is predominant direction of petroleum migration; it induced oil and gas migration at a critical period of hydrocarbon accumulation and formed oil-gas accumulation area. Second, fault across main-line of hydrocarbon migration and high angle skew plug off hydrocarbon, and its side adjacent to Sag is a large number of hydrocarbon accumulation areas. Third, multi-fault region can easily form a fault (-lithological) reservoir accumulation area in the slope of sag.

Abstract: In order to ascertain the oil and gas migration pattern and its effect on gas/oil distribution of Yushulin area of Sanzhao depression in Northern Songliao Basin, this paper makes a comprehensive analysis of the oil source condition, the source-reservoir-seal assemblage relationship, the oil and gas migration pathway and patterns in Putaohua and Fuyang oil reservoir, summarizes the oil and gas migration patterns of Yushulin area, and analyses different oil and gas migration pattern influence on oil/gas distribution in Yushulin area combined with structural history, hydrocarbon generation and expulsion history, sedimentary microfacies research. The results show that there are mainly four types of oil and gas migration patterns in Yushulin area: indigenous – downward type - vertical migration pattern, indigenous - normal type - vertical migration pattern, proximal - lateral migration pattern and proximal – “U” type - complex migration pattern.

Abstract: Crude oil separating is an important technological process in the petroleum industry. Pipe separation technology (PST) is a new kind of separating method in oil-water-gas separation. To compare with conventional gravity separators, the new separator based on PST is low weight, low cost, efficient and convenient to maintain. This paper introduces this new compact separator, technological process and performance test. The test results show that the compact separator has good separating effect. When the water-cut inlet is from 50% to 60%, and the mixture flow rate is from 40 t/hr to 100 t/hr, the water-cut in oil outlet is less than 5%, and the oil-cut in water is less than 100 mg/l.