Advanced Materials Research Vols. 616-618

Abstract: Presently, rescue equipment and method for uncontrolled blowout in offshore drilling are very rare, of which the consequences were very serious. With analysis of mechanics of materials based on shut-in water hammer pressure and wellhead pressure while rescuing, and fluid mechanics of uncontrolled blowout based CFD, a rescue equipment for uncontrolled blowout in offshore drilling has been invented, and proposing a rescue method. There are several emergency scenarios have been made. Take the “deep horizon oil rig” in the gulf of Mexico for example, the flow field properties around this equipment could be calculated by software to prove the reliability of it. The equipment is a conceptual invention which could be designed in different types according to the size and strength of original wellhead. This equipment could prevent well blowout and collect leaped oil.

Abstract: In order to reduce the chance of wellflow and prevent well blowout accident that gets out of control in Xinjiang oilfield, considering the statistical data of the factors that influence the drilling blowout, a model of evaluating drilling blowout risk to Xinjiang oilfield drilling and geological environment based on fuzzy mathematics is established. The drilling blowout risk of each oilfield area in Xinjiang oilfield area has been ranked, and the result indicates that both the nanyuan piedmont tectonic exploratory development area and the kelameili gas field are the highest drilling blowout risk areas. This paper suggests that the well control ranking management should be implemented in the Xinjiang Oilfield. Various well control measures should be made according to different drilling blowout risk, and the risk ranking of drilling blowout should be included in well control design.

Abstract: The retrograde condensation occurs in the condensate gas reservoir when the formation pressure is under dew point. The condensate appears in the formation with phase change in the process of condensate gas flowing in porous media, which change the temperature field and distribution of fluid pressure and affect flow rules of condensate gas in porous media accordingly. New momentum equations are set up, considering Non-Darcy flow effects, the phase change between condensate gas and condensate, phase velocity and fluid character, based on a simple model of three zones. Surface tension and capillary pressure were introduced into the new model. At the same time energy equations are deduced considering latent heat of vaporization and fluid-solid heat coupling. A mathematical model of multiphase flow in porous media with phase change is set up in this paper combining new momentum equations, new equations of energy with equations of mass conservation.

Abstract: Volcanic Reservoir in Songnan gas field is now in the early development, the scale of the single well and stable development put forward important requirements, reasonable match is efficient in gas reservoir development of the key. According to the geological conditions of volcanic rock reservoirs special, in the full analysis of the dynamic and static data, and on the basis of preliminary mastered the gas, water relations; And the use of gas production method, the method of curve, economic boundary method and the improvement of horizontal Wells method of the gas line technology reasonable production optimization and argument, high efficient and economical for gas field development.

Abstract: Taking Sebei gas field as an example, this paper sorts hydrostatic pressure test data over the years and summarizes the reasons that the formation pressure drop curve generates a straight line, up-warping and recurvation from the perspective of water invasion, perforation adding, layer adjusting, sand burying, and sand control as well as inter-layer interference and inter-well interference, with typical wells analyzed and explained. On this basis, two kinds of mass balance correction models which have taken the offset of the pressure drop curve into account are proposed to calculate the dynamic reserves of gas wells with different offset shapes of pressure drop curves. Practical result shows the simple concept and strong practicality of this method, which provides an effective method for the accurate calculation of dynamic reserves of such gas reservoir.

Abstract: This paper takes Yakela-dalaoba edge water and the Luntai basal water condensate gas reservoir for example, analyzes the condensate gas reservoir of edge-water or basal-water production characteristics, water production law in development process, and summarizes the three kinds of type water production of condensate gas reservoir, and put forward water control countermeasures specific to different water production type. Set up four edge-water or basal-water breakthrough models of gas condensate wells and the corresponding control measures, and being applied to the water control of Ya-Da gas condensate wells water gradually and the control effect is remarkable. Through the research of water production law and control countermeasures in Ya-Da condensate gas reservoir, provide significant development guidance for the other condensate gas reservoir which contains water.

Abstract: The carbon nanotubes(CNTs) was described according to condensed-phase optimized molecular potentials and arranged to represent coal structures, while interaction of CNTs with gas components of the system involves the Van der Waals force. Thus, we are able to study the interaction ability between coal and gas in different cases through the binding energy calculated by molecular dynamic method. We find that when there was not liquid water, the adsorption capacity of coal bed methane gases on the surface of CNTs, in the order of magnitude, was CO₂>CH₄>N₂, and when there existed liquid water, the order of the adsorption capacity of gases changed into the order of N₂>CH₄>CO₂>H₂O. When there existed liquid water, the surface of CNTs may first absorb a very thin layer of methane molecules, and then a layer of water group, forming a layer of water film or water drops, providing large quantity of adsorption potential for the residual gases.

Abstract: Study on the timeliness of gasoline analysis adsorbed in cotton cloth carrier was carried out with solid phase microextraction–gas chromatography/mass spectrometry(SPME-GC/MS), meanwhile the effects of temperature, wind speed and humidity on the timeliness of gasoline analysis adsorbed in cotton cloth carrier has been investigated. The results show that temperature is the major factor that affects the timeliness of analysis of gasoline, followed by humidity, and finally the wind speed, and the corresponding data of timeliness, derived equations and correlation are provided.

Abstract: With the remarkable improvement in recognition concerning the feature of the reservoir, a comprehensive adjustment is required to be made during the process of field development. Among currently prevalent methods, well pattern thickening is regarded as the most effective way to maintain or boost the oil productivity. However, to avoid the consequent high development cost of this method, optimizing a reasonable well spacing becomes a necessity to ensure a desirable effect of exploitation as well as an advanced level of economic effectiveness. In this paper, the author sets Zhanazhol Oilfield as an example and uses Srkachef relational expression to provide an accurate method, in which gives a detailed illustration about optimizing economic limit well spacing and economic optimal well spacing in different thickness reservoirs. Given its favorable adaptability, this method will become a valuable reference for the oilfield development in relation to well pattern deployment and thickening in late period.