Advanced Materials Research Vols. 734-737

Abstract: With the Alkaline-surfactant-polymer (ASP) flooding production processs developing, deposition and scaling problems are serious in ground watering and gathering system, pronounced at watering pipeline and heating furnace. So challenges must be faced with in oilfield development process, such as energy consumption increase, equipments and pipelines are damaged easily, and equipments service life shortens. The component of scale sample, which is took from ASP flooding area of Xingbei Oilfield in Daqing Oilfield, in surface watering system is investigated. The influence factors and regulation of scaling in watering system are studied by simulation experiments. It turned out that the scale sample is consists of silica scale, carbonate scale, corrosion scale and organic substance, and the silica scale is the main scale, which content is more than 45%. The watering temperature, flow rate and polymer concentration are main factors of influencing scaling in watering system. Under the conditions of ASP flooding normal production, the effect of polymer concentration is prominent.

Abstract: CO₂ flooding is an important method of enhancing oil recovery (EOR) in extra-low permeability reservoir, which can resolve the problems of water flooding effectively. The EOR theory and influencing factors of CO₂-assisted gravity drainage were studied in this paper. The influencing factors, such as reservoir dip, injection volume, injecting position, well placement and reservoir effective thickness were analyzed and optimized based on the theoretical numerical model which had been established according to Tuha Niuquanhu inclined reservoir parameters. This research indicates that CO₂-assisted gravity drainage can effectively EOR if appropriate parameters were adopted. The results of this paper can offer suggestions to similar reservoir development.

Abstract: This paper does a comprehensive research on job safety analysis framework, characteristics and issues involved in Great Wall Drilling Company Mud logging operation; through research on Mud logging operation safety situation and all kinds of accidents, detailed discussions have been made on the all kind of feature including identify the job hazards and assess the risk personnel ; through JSA(job safety analysis) cases verifying the applicability and effectiveness of JSA method in Great Wall Drilling Company Mud logging operation proposed in this paper, we can see that the JSA method can be used to evaluate program.

Abstract: Ramey model is a classical wellbore heat transfer model. However Ramey model did not consider Joule-Thomson effect. In this paper, Ramey model is improved by considering Joule-Thomson effect. The results show that Joule-Thomson effect will cause fluid temperature higher due to a positive Joule-Thomson coefficient and pressure rise. Injection temperature has little effect on fluid temperature. Fluid pressure is influenced by fluid viscidity. Higher injection pressure leads to faster pressure increasing speed.

Abstract: There is an increasing focus on the effective methods to develop low-permeability reservoirs, especially for ultra-low permeability reservoirs. It is hard to achieve the expected stimulation effect only on the traditional single fracturing, because of the poor supply ability from the matrix to fracture in low-permeability reservoirs. Volume stimulating to reservoir, achieving short distance from matrix to fracture because of producing fracture network. So the volume fracturing technology proposed for increasing oil or gas production, this technology is suitable for low porosity and low permeability reservoir. The conventional simulation method can't describe the complex fracture network accurately,but this paper established hydraulic fracturing complex fracture model based on the finite element numerical simulation method , making the simulated complex fracture more close to the real description,it can accurately describe the flow state in the reservoir and cracks.It has an important reference value to the low permeability reservoirs.

Abstract: The numerical experimental platform of oil containment by floating boom under combined wave and current conditions was presented in a companion paper. The present paper focuses on the application of the platform that numerically predicts the relationship between oil containment failure velocity and wave parameters, oil parameters and boom drafts. The effects of oil density and wave parameters on oil containment failure velocity receive particular attention, and the influence of other parameters such as initial oil volume and boom draft are also quantified.

Abstract: Based on getting block oilfield original drilling core data, the study established a geological physical parameters database and visual geological model of block oilfield, including block areas model, fault model, surface model and so on, by choosing several block oilfield oil parameters and using geological sections. The paper established block model by using hexahedral subdivision skills, estimated three-dimensional space physical parameters by using geostatistics theory and constraints of block areas and faults. It got block oilfield rock parameters spatial distribution and supplied a effective method to find oil rich regions and reach rolling development goals.

Abstract: For the geological features of deformation medium reservoir containing cave, both Darcy seepage process in deformation medium reservoir and Navier-Stokes free flow process in cave are considered. Researching seepage flow in reservoir and free flow in cave as a whole through coupled conditions on the interface, the mathematical model of the coupled flow in the deformation medium reservoir with cave is established. For the flow characteristic of Darcy seepage and Navier-Stokes free flow, the coupling simulation is completed through balance condition of flux and pressure on the interface. The numerical solution is gained, and the chart of pressure and saturation distribution is drawn. The dynamic variation of pressure and saturation is discussed, which could describe dynamic characteristics of the coupled flow in the deformation medium reservoir with cave.

Abstract: Based on the low-temperature and heavy oil reservoir of conventional injection well pattern separated two strains of oil degradation bacteria LC and JH which had satisfactory compatibleness with BaoLige oill field. In order to study the feasibility of enhancing oil recovery rate of the two strains, the experiment of huff and puff with 15 wells were carried out. The average concentration of bacteria increase from 4.7×10²cells/ml to 8.1×10⁶cells/ml. The average reduction of surface tension and viscosity is 33.1% and 31.9%. The accumulative total was 1163.2t. The ratio of input to output was 1:2.12. Microbial enhanced oil recovery can improve the low-temperature and heavy oil production status, which provide a effective method for the similar oil field.

Abstract: The study on distribution laws of remaining oil in high water cut stage is the difficulty of oil field development in the mid-to late period. Aiming at the long development time of Western Bei 2 area of Saertu oilfield in Daqing Oilfield and its complicated well history conditions undergone water flooding, polymer flooding and steam flooding, the 3D geological static model has been established in this test area based on the study on its structure characteristics and sedimentary features. By applying the method of fine reservoir numerical simulation, the paper completes the numerical simulation of remaining oil in the test area and summarizes types of remaining oil as well as their distribution laws in the test area, which provides a reliable basis for the further deployment and adjustment measures in the oilfield.