Advanced Materials Research Vols. 524-527

Abstract: In this paper, we research the blocking effect of air foam, oxidation of oil-air foam and air foam enhanced recovery by experiments. The results show the more injected air foam, the stronger the sealing capacity, but increment trend changes slow. Beside, high-pressure, low-temperature can enhance the sealing capacity of the air foam. Temperature is the principal factor which can influence crude oil-air-foam oxidizing reaction. The reaction rate increases with increase of temperature. What is more, the rise of pressure can accelerate the oxidation response in a certain extent. The air-foam has the good oil displacement efficiency. In the heterogeneous reservoir, air foam injection can seal of high permeable zones, enhances sweep efficiency and is propitious to achieve the low temperature oxidation.

Abstract: With the constant expansion of super heavy oil SAGD conversion development, the accurate testing of the crude oil in the high moisture content range is particularly important. In this paper, against the characteristics of Adopting SAGD technology exploiting heavy oil, BP neural network prediction model and calculation method has been adopted to predict the moisture content of crude oil. Through the study, the experimental data of the model were verified by the maximum prediction error is less than 3%, the accuracy of the forecast moisture content of crude oil to meet the site requirements. Through this study, the experimental data to the model was validated by the maximum prediction error is less than3%, the prediction accuracy of which to moisture content of crude oil is able to meet the requirements of the project site.

Abstract: Beam pump dynamometer card plays an important role in identifying the production state of oil wells. With an ability to reflect any non-linear mapping relationship, the artificial neural network (ANN) can be used in pattern recognition. This paper illuminates ANN realization in identifying fault kinds of dynamometer cards, including a back-propagation algorithm, characteristics of the Dynamometer card and some examples. It is concluded that the buildup of a neural network and the abstract of dynamometer cards are important to successful application.

Abstract: In order to Make Use of Acoustic Wave to Transmit the Information from near- Bit End to a Remote Bit End, Using the Finite Element Method, Simulate and Analyze the Acoustic Wave Propagating Characters of Common near-bit Drill Tools: Ordinary Drill Collar, Spiral Drill Collar, Integral Straight Edge Stabilizer, Integral Spiral Stabilizer and Screw Drill. the Results Show that: because the Form and Size of Axial Cross Section Are in Basic Consistent, the Ordinary Drill Collar and Spiral Drill Collar Not only Have Better Characteristics in Time Domain, No Repeated Oscillation of Waveform Occurring, but Also Have Wider Bandwidth (up to 4KHz), and because of the Stabilizer Section, the Acoustic Impedance in the Axial Direction Discontinuities and the Time Domain Waveforms of other Three Kinds of Drilling Tools Appear that Not only Waveforms Have Shook Repeatedly, but Also the Width of the Pass Band Has Narrowed Significantly.

Abstract: In the process of oilfield development, understanding of interwell communication and judging directions of water drive and breakthrough are the premise of formulating development plans and adjusting producing measures. Rate correlation degree analysis method of grey theory is applied to calculate the rate correlation degree between water injection and water/oil production, and to quantitatively describe interwell communication. This method, avoiding the tedious work of researching interwell communication through sedimentary microfacies and numerical simulation methods, overcomes the shortcoming of being affected by extremum as in absolute correlation degree analysis method. Applications indicate that rate correlation degree analysis method is practicable

Abstract: In this paper, The use of the basic mechanics model, based on the use of fluid-structure coupling of thinking, the use of finite element software simulations, And Then quantitative study the effect of perforation parameters such as perforating depth, aperture,shooting density,shot phasing,drawdown on hole stability and well yield,make sure the weight size relationship of each perforation parameters about hole stability and well yield based on the orthogonal analysis. In the end based on the actual lithology information and original crustal stress distribution in longxi area of Daqing ,to design optimum perforating parameter of this block well.

Abstract: Most of the traditional drilling fault diagnosis & decision systems use static data mining technology, so the update of knowledge base becomes its bottlenecks in its development. In order to meet the actual needs, this paper puts forward the method, which combines dynamic data mining technology with case-based reasoning technology, to design drilling fault diagnosis & decision systems. First, design drilling fault diagnosis system overall, then describe the realization of how to realize dynamic data mining and case-based reasoning in detail, finally, introduce some question about the update of knowledge base.

Abstract: The technical problems during the development of unconventional oil and gas reservoirs are becoming more and more difficult to handle with conventional drilling and production methods. Supercritical carbon dioxide has so many good properties such as high rock-breaking drilling efficiency, strong dissolved displacement performance and unharmful effect on the reservoir that it can be used as a drilling, completion and production medium to effectively exploit the unconventional oil and gas reservoirs. The global distribution of unconventional oil and gas resources is introduced, application status of carbon dioxide in oil and gas development is discussed, and development prospects of supercritical carbon dioxide in the unconventional oil and gas reservoirs are systematically analyzed. Using supercritical carbon dioxide as a medium in the whole development process is an important trend of unconventional oil and gas development technologies.

Abstract: The mainly borehole problems are sticking (collapse) and circulation loss in Xujiahe formation of ZJ block, so the drilling rate is very low. In order to improve the penetration of rate of ZJ block, the rock mechanical test method, ground stress test method, well history statistics method, and logging data analysis method were adopted. The borehole stability mechanism of xujiahe formation was analyzed. Combined with the drilling fluid experimental evaluation, the measures of improve wellbore stability of xujiahe formation was Proposed. Field application tests show that, the borehole problems and its processing time are greatly reduced using those proposed measures. The penetration of rate in the Xujiahe formation of test well increased 20-30%, and the application effect is obvious.

Abstract: In the light of the characteristics of the project across the Yangtze River from Jangling through large distance and the crossing section’s less construction experience, a detailed survey had beencarried out ,by comparison of survey data analysis , this paper forecasts the program may emerge some specific engineering geological problems and finally gives the appropriate construction program.