It's very hard to describe the reef cyclic sequence changes and internal reservoir with traditional process and modeling methods,so in this paper we tried to use the key structural surface + sequence nodes control techniqueto define the skeleton of 3D model and describe characteristics of regional structure and the cycle of sequence elaborately. And we also used the restriction in sequence + well microfacies control techniqueto establish the micro model. Based on sedimentary microfacies fine model,we adopted facies control + seismic reservoir predictionto establish the reservoir property model. The model described the formation structure morphology accurately,and showed complex reef sedimentary sequence clearly with different types of reservoirs in vertical and planar distribution.
Enormous data about drilling,logging and production reveal that shallow lake sandy beach at Gaoyang Es1,northwest Lixian slope in Raoyang sag is a good reservoir. Based on the core description and relevant experimental data,combining with comprehensive analysis of logging,paleogeomorphy,this paper described the sedimentary characteristics,and pointed out the common stacked relationship between the sandy beach and subaqueous distributaries channel; it also analyzed the control functions caused by paleogeomorphy and changes of lake level to the plane distribution of sandy beach.
The air permeability of the North Branch E 'nan tight sandstone reservoirs is generally less than 0. 5 ×10- 3μm2,belonging to ultra- low permeability reservoirs. Currently a variety of drilling and completion methods are used during the reservoir development process of horizontal wells and thus caused several difficulties in the drilling,such as long cycle,slow ROP difficulties and post- treatment. In this paper,we made a study and optimized in completions,well construction,drilling and completion fluids and casing down into the safety technology. Finally we formed a set of effective techniques for drilling and completion to develop the E'nan tight sandstone reservoirs.
This thesis focuses on the marine carbonate gas reservoirs' perforated liner completion seepage law of Yuanba area,and considering the real gas deviation factor,density,and viscosity based on pressure,it also established the mathematical model. With the help of COMSOL Multiphysics software,the model could carry on seepage calculation,and then get near well seepage field distribution of perforated liner completion. The research obtained that the pressure change obviously shown as cone of depression from supply boundary to hole bottom,consistent with the trend of conventional analytical solution. When the gas in the wellbore location away from the flow rate of the flow velocity is small and close to stable,near-wellbore region wavy flow velocity distribution in which the maximum flow velocity at both ends,with emphasis on the speed of the sensitivity analysis.
Based on a brief introduction of the development of the continuous circulation valve both at home and abroad,the article also describes the working principle and characteristics of different structure continuous circulation valve. At last,the article discusses the development trend of the continuous circulating valve,and points out the direction for the research of continuous circulation valve.
The sensitivity test experiment of 34 natural sandstone samples from north china,Qinghai and other oil fields are carried out with the seepage flow stress coupling simulation triaxial experiment system. Based on the stress sensitivity constant evaluation method,the fitting curve between stress sensitivity constant and rock permeability could be achieved. The results have shown that stress sensitivity constant could represent the characterization of stress sensitivity of sandstone permeability. The higher stress sensitivity constant is,the stronger the stress sensitivity of sandstone permeability is. Moreover,stress sensitivity constant of sandstone decreases with the increase of the sample's permeability.
This paper focuses on the study on the characteristics of fractured horizontal well productivity. Based on the analysis of the advantages and disadvantages of the existing model,it formed a correct understanding of the formation of cracks production and distribution characteristics. Using the concept of equivalent diameter of well distribution,it developed the productivity formula with a plurality of infinite conductivity fractured horizontal wells,considering the starting pressure gradient and high velocity non Darcy effect. The horizontal well productivity formula containing 3 transverse cracks,and based on it we can analyze the effect caused by starting pressure gradient and high speed non Darcy on productivity.
Since the narrow river,unstable lateral reservoir distribution and complex vertical stacked relationship,seismic inversion while drilling and single sand body description,etc. new technologies were used to guide the well location optimization of development wells successfully. In addition,as some wells showed low productivity and reservoir pressure dropped quickly,high- precision single sand layer and single sand body correlation,and facies study under the constraint of seismic were used to analyze the connectivity between wells through dynamic and static research. Ultimately comprehensive characterization was described for the ribbonfluvial reservoirs. Based on this,the development strategy of fine adjustment of water injection and liquid production was applied; oil field was no longer in the situation of passive production.
在砂体横向相变快、储层非均质性较严重的致密油层,须将工程地质、施工工艺、方案优化设计三者有机结合起来,以解决穿层压裂施工方案适用性不高的问题.经过研究,在纵横波测井数据预测模型基础上,建立起三维岩石力学参数和地应力参数的井震结合预测技术,实现水平井分段压裂人工裂缝全三维模拟,形成水平井增产改造"工程-地质一体化"技术体系.
By the means of thin section analysis,scanning electron microscopy and cathodoluminescence,the diagenetic facies features of the tight sandstone reservoir were studied in Xinchang structural belt. Based on the division method depending on the single factor,the result shows that the reservoir can be divided into 4 basic and 3 transitional types of the diagenetic facies. The conventional logging identification model to the diagenetic facies was established by analyzing the characteristics of conventional logging curve,then the reliability of the model was verified through the study on comparison of the diagenetic facies divided by the conventional logging identification model and by the data from analysis of core sample,well log,well logging interpretation and production test.
HAZOP is a systematic process of identifying analytical methods that use guide words as the basis,through a series of meetings which was consisted of professionals to complete the analysis of the various risks that could cause deviations in the operating system process. In this paper,HAZOP analysis method was applied to analyze the deviation of a specific field gathering station and the size of its risks was figured out based on the evaluation matrix. According to the analysis of all kinds of dangerous and harmful factors,the paper pertinently gives recommended measures which confirmed the security of gathering stations.
Cavity completion of CBM as an emerging technology has gradually been widely used abroad by means of building cave in completion of CBM,including artificial momentum way,mechanical way,hydraulic way and chemical way. In this paper,these building-cave techniques are under series of studies. In conclusion,the stimulation effect of artificial momentum way is most obvious; mechanical way is the easiest way,and the combined effect is the best; the stimulation effect of chemical way is better than hydraulic way.
Tight sandstone gas reservoir is easy to appear water blocking damage,which would be very difficult to unlock and seriously affect the gas reservoir development once occurred. Thus,establishing an accurate evaluation experiment method of water blocking is extremely important. Based on the existing evaluation experiment,this paper proposed improved water locking damage evaluation method on tight sandstone and designed water blocking damage simulation device in underbalanced conditions. And it could be more accurate in evaluation of water blocking situation. Combined with the site core the result shows that: taking salting problem into account can increase the evaluation results; under reasonable pressure it has good protective effect in underbalanced drilling.
Due to the geological features in abnormal high pressure and low permeability gas reservoirs,in the course of depletion development it showed a strong stress sensitivity of permeability,which had significant impact on the effect of gas reservoir development. And it brought a large deviation in the calculation of recovery. In this paper,based on the nonlinear flow mechanics and considering the stress sensitivity,we established a three- dimensional gas- water two- phase flow mathematical model and numerical models,and wrote the corresponding numerical simulation software. According to the core experiments and preliminary economic evaluation data we simulated different recovery under different production speed and formation stress sensitivity. The research suggested that the impact of stress sensitivity should be fully taken into consideration in the calculation of recovery calibration; otherwise it would be about 10% above the recovery factor calibration. And the stronger the stress sensitivity is,the greater the impact it would have on the ultimate recovery.
In this paper,the effect of rotor position offset detection for the installation error of superconducting gyroscope shell is analyzed and the principle of the photoelectric detection method for superconducting gyroscope rotor position offset is clarified. It gives a few mathematical formulas about the installation error of superconducting gyroscope shell and the time of the weak signals received by the photoelectric sensors are deduced on several conditions. The relationship curves between the time of rotor position offset detection and the installation error of superconducting gyroscope shell are obtained by the simulation analysis.
The traditional HCRM system cannot meet the needs of timely artificial reply when facing medical knowledge and illness consulting. The naive bayes algorithm was applied to text categorization in order to help establish different contact according to different patients and also to provide targeted services and diagnostic scheme.
厄瓜多尔D-F油田M1油藏目前已进入特高含水期.为了进一步提高油藏动用能力,实现井间剩余油挖潜,勘查含油富集区,通过岩心观察和测井相资料,对油藏的沉积特征及沉积模式进行分析.分析认为,该区为潮控三角洲沉积,沉积相类型分为潮汐三角洲前缘和潮汐三角洲平原亚相,也可进一步细分为潮汐河道、潮汐河道间、潮汐砂坝和内陆棚等沉积微相.
North Buzachi( NB) oilfield in Kazakhstan is an ordinary edge and bottom water heavy oil reservoir under waterflooding development. In this oilfield,based on vigorously strengthening fine research on reservoir geology,we actively promoted the use of new technology of horizontal wells reservoir development. For main parts of this oilfield,combination production of vertical wells and horizontal wells was used to develop the remaining oil between injection and production wells. However' for oil- water transition area at the reservoir edge,improvement to recoverable reserves utilization was our main target. During production process,horizontal wells in oilfield main parts have features that water- cut will increase quickly while production declines rapidly,so the reservoir failed to achieve the desired results. In this research,we combined with the geological characteristics of this reservoir,analyzed the production characteristics of horizontal well development reservoir and through numerical reservoir simulation,optimized the deployment of horizontal wells in new areas and explored the adaptability of horizontal well development in this type of reservoir.
