Through an inverse emulsion polymerization technique, graphene oxide-grafted polymeric microspheres (RGO-PMSs) with superior suspension properties, thermostability, hydration swelling, elasticity and strength were developed for in-depth profile control and displacement. RGO-PMSs undergo migration and adsorption in large pores; capture by means of single plugging, coincidence plugging and bridging plugging; and elastic deformation-recovery in small pores to increase seepage resistance. When matching coefficient was 2.11, RGO-PMSs particles could not enter the porous media. However, RGO-PMSs particles entered core samples smoothly and perform plugging when the matching coefficient ranged from 0.78-1.44, while RGO-PMSs particles could not effectively block the pores when the matching coefficient was 0.67. An increase in the injection rate improved RGO-PMSs injectivity while weakening plugging efficiency. Additionally, the increase in the RGO-PMSs concentration and strength enhanced the plugging efficiency. Moreover, RGO-PMSs had a favorable anti-outwash property with a retention ratio of 88.7%, maximum additional flow resistance of 7.12 kPa and additional flow resistance of 4.53 kPa during migration. All the results indicated that RGO-PMSs could be an applicable candidate for in-depth profile control and displacement.

This research aimed at the investigation of the effect of different metallic additive on the combustion and kinetic behavior of crude oil. For this purpose, the thermal behavior of the oil-only and oil–metallic salts mixtures were studies by the thermogravimetry (TG)/derivative thermogravimetry and differential scanning calorimetry (DSC) on heating rate at 10 °C min−1. The result shows that Dagang crude oil exhibited apparent low temperature oxidation (LTO), fuel deposition, and high temperature oxidation processes. With the addition of metallic salts, the LTO process has been shortened and samples added CuSO4, CrCl3·6H2O, and AlCl3·6H2O achieved a much lower peak temperature than that of oil. Based on the Arrhenius model, metallic additives were proven to have obvious influence on the combustion activation energy. And, by comprehensive analysis of TG/DSC profile and activation energy, ZnSO4 exhibited a positive influence on light crude oil combustion during the high pressure air injection process.

Abstract This presentation provides a technical overview of a project aimed at evaluating the feasibility of Enriched-gas injection by using a small well distance in the later period of the pilot tests. The advantage of a small well distance is that the initial and peak production responses can be reached early. Thus, the feasibility evaluation could be initiated sooner. Pilot tests in two areas were conducted. The first pilot test was performed by continuous gas injection in area IA with well distance 250 meters. The purpose of this test was to evaluate the effect of the continuous enriched-gas injection on the relative high permeability layer IV. The second pilot test was carried out in area IV using WAG process with well distance 150 meters. The goal was to see if WAG can enhance oil recovery by injecting into and producing from layers II, III, and IV simultaneously. The implementation for IA area was stopped due to solvent breakthrough after 112 days of operation. The oil recovery was increased by 8.9% compared with water flooding. The other pilot test in IV area is still in operation. A numerical simulator has been used to predict the oil recovery after matching production performance. The oil recovery is significantly lower than that in IA area because of faulty perforations in the main producing layer IV. However, compared with water flooding, an encouraging increment by 5.39% can be obtained by deducting layer IV’s OOIP. These results show that both continuous injection and WAG process can improve oil recovery significantly. The numerical simulation study showed that a large well distance can also increase oil recovery in both of the testing areas. Further tests with the wells at larger distance may be performed in the future.

室内钻井液动态损害评价实验往往在较短时间内完成,与现场实际钻井过程不符.利用高温高压动态损害评价仪,模拟现场实际钻井过程,将被钻井液损害后的岩芯浸泡在钻井液滤液中一定时间后取出返排,评价不同浸泡时间对返排效果的影响程度.实验结果表明:随着钻井液滤液浸泡时间的增加,油基钻井液体系的返排恢复率变化不大,水基聚合醇体系的返排恢复率有下降的趋势；短时间浸泡时变化不大,长时间浸泡后返排效果明显变差；无固相体系的总体趋势是增加的.钻井液滤液浸泡时间对返排效果的影响主要与钻井液性质、储层特征、储层损害机理等因素有关.

Gas lift is the main artificial lift technique in Zarzaitine oilfield in Algeria.For there is no fixed ration supplying gas equipment for each single well in wellhead,it is possible that parameters change in any key point will affect the stable running of whole system.Because of the poor stability of ground facilities and frequent occurring of wellbore problems at late stage of development,limited management resources can not satisfy the requirement of high efficiency of oilfield development.Based on the deep analysis of the system and technological factors and managerial factors influencing gas lift efficiency for single well,the method way to optimize ration supplying gas for single well and gas lift technical parameters were given in this paper.Besides,the pressure monitoring and alarming equipment for ground system was explored to make sure the system optimization and running stability.The technical prevent measures has been proposed to solve the well bore problems,which was combined with grading administration in single well to optimize managerial resource.The monthly inspection covering rate for single high production well can reach more than 95% after implement,and achieve the purpose of enhancing the development and management level in maximum with the minimum cost.

By considering the reservoir quality and property of crude oil in certain oilfield of Algeria,we choose the representative well group to develop the Enriched-Gas miscible flooding systematically.Based on the laboratory experiment results,this reservoir is suitable to implement the miscible flooding.The slim tube experiment indicates that under the reservoir condition(83.9℃ and 10.2MPa),the MMC of LPG and nature gas is 37.1∶62.9.The results show that the MMC is capable of forming miscible fluid with the formation oil;the long core displacement experiment shows that after the water cut reaches 98%,the miscible flooding is able to enhance the oil recovery more than 15%.By numerical simulation,we analyze the sensitivity of a series of injection parameters including the injection rate,volume,mode and layers.The recommendation scheme is alternative injection in EOR-1 well group and continuous injection in EOR-2 well group,the injection ratio is 600m3/d(under the reservoir condition) and the injection volume is 0.3 PV.The simulation result of recommendation scheme can enhance oil recovery about 14%~15%.The result of pilot test reveals taht there is override phenomenon in EOR-1,the efficiency of miscible flooding is poor,and a kind of treatment is proposed to kill gas breakthrough;while the efficiency of miscible flooding in EOR-2 is very good and inspiring.

Numerical simulation is an important method to verify the results of indoor test of miscible flooding,to analyze the sensitivity and to optimize the injecting program.Results of the numerical simulation of reservoir fluids and miscible simulation of long-tube and well group are consistent to the indoor experimental results.The result of numerical simulation shows that the MMC,composed of GPL and gas with a mol proportion of 37.1:62.9,can be miscibled with crude oil under the condition of reservoir,which is coincident with the result of indoor experiment.Based on the analysis of pressure,temperature and sensitivity of injecting parameters,WAG is recommended in sector Ⅳ(half a year).The miscible plug will be cumulatively up to 0.1 PV,and production is performed in the layer of Ⅰ,Ⅱ and Ⅲ and layer Ⅱ and Ⅲ are injected.

Combined with the result of long-tube test,the impact of injecting time,means and quantity of enriched gas miscible drive on the miscible effect is evaluated by the experiment of long-core test.Under reservoir condition,the miscible fluids,composed of GPL and gas with their mol proportion of 36:64,are capable of being fully miscible with crude oil,and enhance the recovery rate of 15% compared with water drive.In terms of the injecting technical parameters,early injection of miscible fluids is favor of enhancing production rate,and WAG is propitious to controlling gas-out.Injecting quantity of miscible fluids has a great impact on drive effect and differential pressure of sequent water drive,and it is advised to optimize injecting plug size of miscible fluids by means of numerical simulation in order to increase the economic benefits of miscible drive.

The minimum miscible composition(abbreviation MMC) of rich gas in Zarzaitine Oilfield is defined by the long-tube test.MMC is around 37.6 :62.4 under the pressure of 97.12 kg/cm2 and temperature of 83.9 ℃,and around 37.1 :62.9 under the pressure of 110.16 kg/cm2.In view of the great impact of pressure on MMC,it is proposed to increase the appropriate proportion of GPL in the course of the field conduct.

The reservoir of Shengtuo Oilfield "W" zone has the feature of low porosity and permeability, and it is difficult to use common logging program to oil-water reservoir identification and reservoir evaluation. This paper introduces a qualitative method that uses distribution of T2 spectrum to identify fluid quality quickly and a quantitative approach which establishes a nuclear magnetic resonance interpretation model to compute the reservoir parameter, and other data, to identify fluid quality.The method is applied in "W" low permeability reservoir and the result is satisfied.

At the middle and late stages of oilfield development, measures were taken for enhancing oil increment and stimulation, oil and water well situations became more and more complex. Engineering log technique could be used for detecting the downhole conditions and providing scientific basis for implementing measures of oil increment and stimulation. The development situation of engineering log techniques is studied. Application examples of the engineering log are discussed. The techniques are the effective means for remaining oil detecting at the late stage of oilfield development, by which eyes are provided for application of engineering log technique in oilfield development. It plays an important role for raising oil recovery rate.

The formation damage during drilling are recognized as 2 types: mud solid particles plug and mud filtrate invasion.Based on analysis of the responses caused by mud damage to SP log and deep-,shallow-and micro-laterolog,this paper summarizes a qualitative method to distinguish formation damage,and a movable water model to analyze the damage type.The expression to estimate damage radius is presented,and so are the evaluation graphs and data tables of formation damage logging as well.

The basic theory of project design and optimization in profile adjustment is the effect prediction of the project. Through analyzing the influence factor of profile adjustment, the BP network effect prediction model is established and optimized. The BP network effect prediction model proved the prediction model credibility and made designer satisfactory, the BP network effect prediction model can use to predict the effect of profile adjustment measure.

在灰色理论和模糊数学的基础上,通过建立灰色关联决策模型,对区块整体调驱方案优化决策进行了研究.结果表明灰色关联模型能有效地解决因素间相互制约的工程优化决策问题,在区块整体(弱凝胶)调驱方案中从稳油控水程度、成本投入等多因素综合考虑,并非处理量大、增油量多的方案就是最佳方案.在大港油田官195断块弱凝胶调驱方案中,处理剂量为3 485 m3左右较为适宜.