Advanced Materials Research Vols. 1010-1012

Abstract: The properties analyzing of flotation feed sample told that this fine coal sample is high-ash and hard-to-float coal slime. The ash reduction comparison of the step-by-step release flotation test with high intensity conditioning (HIC) or not, and the comparison of flotation test with HIC and adding depressant were made. The results showed that HIC can significantly improve the flotation effect for high-ash and hard-to-float coal slime. Comparing with the traditional step-by-step flotation process, if it meets the demand of ash content is 10.00% and 8.00%, the clean coal yield with HIC will increase 18 and 29 percentage points respectively; comparing with the effect of floatation adding depressant, HIC has more help to reduce the ash content and increase the yield of clean coal. In addition, HIC will save a lot of flotation reagents.

Abstract: Currently most of our oil fields have entered the extra high water cut stage. Accurate prediction of field development dynamic is the foundation of the reasonable, efficient, sustainable oil field development. Prediction of oilfield development index have varieties of methods ,including the law of diminishing water flooding Union law solution, yield component method, multiple regression and so on. In this paper, we take xingnan development zone eight to twelve district extension well network development index prediction as an example, introduces the application of multiple regression method in the prediction of reservoir indicator.

Abstract: The data of Logging While Drilling is used for Geosteering and evaluation of layers. Compared with traditional logging, LWD has its own advantages, real-time, security, and it could obtain original information of the destination formation.With the rapid development of logging tools design, LWD tools have a large improvement, and various tools used for measuring the parameters of layers have been designed and applied , resistivity imaginary logging tool, MPR, InSite ADR, Shock Wave have been invited and innovated. However, there are still a lot of unsolved problems existing, such as interpretation of logging, the accuracy of the evaluation on layers and so on. Therefore, numerous work need to be done in the future.

Abstract: In recent years, Xingnan development zone have totally gone into high water cut stages and high recovery degree reserves from the partial period, facing with a stern fact that it transitions from a basic injected and produced fluid balance to a serious imbalance. Therefore, it is of important practical significance for predicting the production of remaining oil and improving recovery efficiency that strengthen the research of diminishing prediction of each well pattern. In this paper, by using a series means of graphical method, try and error method, curvilinear dislocation, type curve matching method and binary regression analysis, we comprehensively judged the production decline types of different well patterns, and calculate the production decline rate of each set of well pattern..

Abstract: The water cut of the water controlled field is an aggregative indicator which is affected by various factors during the development of the field. It can not only reflect the oil layer and the restriction of liquid flowing rules from crude oil physical property but also can reflect the effect of serious technical measures during the exploitation. Incremental rules of water cut are closely related with water percentage. This paper evaluate the rising level of water-cut of various well network during oil producing with super high water cut in Xingnan development area, compared the differences between various well network and make analysis of the geology and exploit causes.

Abstract: This paper introduced the problems exist in the process of stimulation for the large section perforated old horizontal wells, analyses found the staged fracturing technics string of the horizontal wells in Daqing oilfield did not suit the large segment perforated oil wells. Meanwhile introduced a technic that can satisfy the fracture of large segment perforated old horizontal wells, that are bridge plug fracture and liquid colloidal plug, analyzed the construction characteristics, suitable well conditions and issues exist in the construction procedure of the two technics, provided an example for completing the staged fracturing in the future.

Abstract: To improve the understanding of the influence of effective permeability, reservoir temperature and oil-water viscosity on relative permeability and oil recovery factor, core displacement experiments had been performed under several experimental conditions. Core samples used in every test were natural cores that came from Halfaya oilfield while formation fluids were simulated oil and water prepared based on analyze data of actual oil and productive water. Results from the experiments indicated that the shape of relative permeability curves, irreducible water saturation, residual oil saturation, width of two-phase region and position of isotonic point were all affected by these factors. Besides, oil recovery and water cut were also related closely to permeability, temperature and viscosity ratio.

Abstract: This study evaluated the potential for application of nitrogen injection to Dujiatai which is a water-flooding reservoir developing for decades. ECLIPSE PVTi module of simulation was employed to determine N₂-oil MMP (Minimum miscibility pressure) which is as a criterion for screening. Then, through nitrogen flooding development scheme design and index prediction of a typical well group, we get the optimal water alternating gas (WAG) scheme. The optimal scheme can obvious increase the reservoir recovery for the next decade, which can be a useful development method for similar water-flooding reservoirs.

Abstract: SAGD has been a major replacing technology in Liaohe Oilfield at the late stage of steam soaking and the scale is expanding gradually, How to monitor the SAGD horizontal production well effectively is the key problem in operating the SAGD well group, multi-point monitoring technology is adopted in Liaohe Oilfield to Monitor multi point temperature and pressure of production wells in the SAGD well group, Multi point measured data of temperature and pressure analysis method is obtained through typical examples analysis, and the important role of multi-point monitoring data is pointed out in regulation of SAGD well group.

Abstract: Heat self-generated CO₂ technique is proposed, which is focused on the problems of recovery difficulty, poor effect steam soaking and so on for heavy oil reservoirs. This technology is combining of steam flooding and gas flooding and so on. Its main mechanism is the application of steam heating blowing agent to generate a large volume of gases (including CO₂, NH₃, etc) in the formation. While some of these gases acting with the oil to reduce the oil viscosity, some form miscible flooding to reduce water interfacial tension, so as to achieve the purpose of enhancing oil recovery. An optimized selection of the heat blowing agents was performed. By comparison the difference before and after the reaction of blowing agent solution, the increase of alkaline is occurred after the reaction, and is helpful to reduce oil viscosity and lower interfacial tension, etc. Studies indicate that heat-generating CO₂ flooding technology can get a maximum viscosity reduction rate of 76.7%, oil-water interfacial tension decreased by 54.77%, further improve oil recovery by 4.17% based on the steam drive, which shows a technical advantage toward conventional EOR method. The field experiments indicate that the technique can greatly improve the oil production, which will provide a powerful technical supporting for the efficient development of heavy oil.