在根据岩石薄片、铸体薄片、扫描电镜、压汞等分析测试技术,对扎哈泉X井区下油砂山组碎屑岩储层特征以及影响因素进行综合分析.分析结果表明:X井区下油砂山组储层岩石类型为长石质岩屑砂岩及少量的岩屑质长石砂岩;对储层影响较大的成岩作用为压实作用,其次是胶结作用和溶蚀作用;储层孔隙类型以原生孔隙为主,其次是次生孔隙;储层属于中孔中低渗储层;沉积作用、成岩作用和孔隙结构是影响研究区储层物性的主要因素;其中优势储集砂体为滨浅湖的坝砂和滩砂;胶结作用对储层物性影响较大;孔隙结构对储层物性影响明显.

The gas reservoirs of Hongtai Gas Field are characterized by low porosity,super-Low permeability and severe heterogeneity with multilayer in vertical.If the strings for two-layer separate fracturing are taken to complete five-layer fracturing,there will be some problems,such as killing well many times,long-term construction,serious reservoir damage and the little production increasing,so a pilot testing of the string for five-layer separate layer fracturing was conducted,that is,ball-off was used to open sand blower for sand fracturing by three Y241 and a Y221,then releasing packer step by step,releasing string stage-by-stage and running the production string were carried after the end of spurting.The pilot testing of the string for five-layer separate layer fracturing was conducted successfully in Hongtai 25-2 well,which increased the gas productivity obviously.

Welded plates are tested by using model analysis technology and frequency response functions are derived. Model parameters, including first 8 intrinsic frequencies and first 4 model shapes are distinguished by modeling method. Research shows that in the same boundary conditions, the model frequency of the welding medium thickness increases; meanwhile, the plate frequency influence rate of the welding medium thickness decreased gradually;compared with the contrast board, the damping ratio of the welding plate obviously increases.

根据现有重力式分离器和离心式分离器结构,应用CFD技术对其内部流场模拟,通过正交实验方法设计了不同工况下的数值模拟方案,应用极差分析法和方差分析法对影响除气效果的各因素进行研究。分析认为,影响除气效果的主要因素是气泡直径和钻井液黏度。根据数值模拟得到最理想的分离器结构和工况组建了室内实验台架。将实测数据与数值模拟结果进行了对比,分析结果表明,数值模拟得到的除气效率变化趋势与实测结果总体一致,验证了数值模拟方法的可行性。

In allusion the physical property of Tertiary Reservoir and characteristics of sand production in YMX Oilfield, the matching techniques for sand fallout and fracturing at the end of sandstone were studied and tested. A full 3D fracturing simulation method was used to optimize the its fracturing (fracture length of 40m, the optimal fracture conductance ability being 0.4~0.6μm2·m). Technique of height control with diverting agent is used to effectively prevent water zones to be fractured. The effect of fracturing was guaranteed by using the matching technique of rapid backflow, pretreatment of formation. The method is used in 4 wells with 100% success rate, single well production rate is raised to 12.8t/d from 3.6t/d. the validate period is 24 months. The problems of low production and sand production are effectively solved in a single well.

The tight clastic reservoirs of the Eogene Formation,which had the character of low-porosity and low permeability,were greatly grown in Kuche Region,Tarim Basin.On the basis of experimental data,for the needs of fine reservoir evaluation,the main geological factors of m exponent and n exponent (the exponents of Archie formula) were analyzed qualitatively,including the geological factors of porosity,average grain size,calcite cement,gypsum cement.By geological statistics,the qualitative correlation between m,n and major influential factors are determined.The values of m and n are continuously calculated by using logging data,and oil and gas saturation is consequently calculated.Application shows that this method is used for improving the adaptability of Archie formula and precision of saturation evaluation.

In the volcanic reservoirs in Niudong Block of Santanghu Basin,it had a characteristics of high filtration,high sand plugging,at the same time,the reservoir had the characteristics of strong water sensitivity and low temperature,it was difficult for fracturing.By optimizing the formulae of fracturing fluid,technical parameters,fracturing patterns,the techniques of full sand packing,compressed seal off,multi-staged optimizing sand usage were used,the matching techniques of long fracture,high sand ratio,and low temperature and low damage of fracturing were created,by which the performance of sand carrying.The ability of quick cementation,effective support of fractures and continuous sand laying of the fracturing fluid are effectively guaranteed,the formation damage is effectively reduced.It is used in 26 wells with success rate of 92.3 %,the average daily fluid increment is 20.6m3,daily oil increment is 16.1t.the effect of oil production increase is obvious.

Tuha Oilfield belongs to low pressure,low permeability and high gas-oil ratio oilfield.The high-speed development of early stage made the characteristics of low pressure and high gas-oil ratio more obvious.The formation contamination came out because of the flowing back of well-killing fluid after reperforation.This made the operation inefficient or even worse.To solve these problems,the integrated string technique of reperforating and rod pump running was adopted.Some new tools were developed with this technique,such as downhole controlling tools,core-bailer fishing tools,spiral sand-control gas anchor and combination sand control string.These tools perfected the perforating operation and solved the problems of tubing-casing annular sealing and perforating under pressure operation.The application of this technique has obtained obvious effects and has been spreaded in the oilfield.

Fractal geometry expression of NMR T_2 value was derived based on the predecessor researches in the fractal characteristics of sandstone pore structure and the relation between capillary pressure and NMR T_2 value.A method for studying the pore structure fractal characteristics was developed by using the distribution of NMR T_2.compared with conventional methods,it has some advantages,such as fast,no damage on sample and so on,and it expands the application of NMR data as well.Judging the fractal characteristics and calculating the fractal dimension of 10 core samples were carried out in Well X of Area A by using this method.The results of judgment were consistent with that of capillary pressure data,but the calculated fractal dimensions are smaller than those calculated with capillary pressure data.The difference is caused by the difference of pore structure mentioned above.The result also indicates that the fractal dimension obtained with T2 can be used to characterize the rock physical properties and provide reference for reservoir characteristic study and its identification.

The tight sand reservoir with high pressure and low permeability in Kuqa foreland basin is divided into three types in terms of lithology and physical property, and its well-logging responses and fracture distribution are reviewed. By in-depth analysis of such a reservoir, its standard chart for evaluation of the reservoir is established, providing a new thought and/or method for complex reservoirs by well-log evaluation.