针对胜利油田地热井尾水灌压力上升快、回灌率低的问题,开展地热尾水回灌储层堵塞机理研究.结果发现:回灌尾水中悬浮物及铁离子超标、尾水与地层水不配伍存在结垢是回灌储层的堵塞因素,在回灌过程中会对储层造成较大伤害.提出了预防储层损害的措施和手段,研发并优化适合胜利地热回灌储层的低成本的解堵体系,实现地热资源的经济高效开发.

The rich resources of tight sandstone reservoir exist in Shengli oilfield, however, it is of the features of deep, fine, thin, poor and scattered distribution. The deployment of vertical wells on low productivity reservoir can only be of the characteristics of early rapid production decline with poor efficiency. In order to improve the level of development of tight sandstone reservoir, the horizontal well technology research and test are implemented through design and operation optimization to enhance the fast drilling technology for horizontal well, and obtain the break through for the tight reservoir productivity. In the field, we formed the horizontal well techniques with multi-stage fracturing by means of perfection of matching fracturing and completion pipes, field injection and storage equipment and fracturing monitoring approaches. Until the end of 2013, the Shengli oilfield has implemented 28 horizontal wells on the tight sandstone reservoir with the success rate of 94.4%, and cumulative production up to 50 746 tons of oil. It provides the reference for the effective development of tight sandstone reservoir in Shengli oilfield.

Deep profile control technology is one of the important measures to improve the development effect of water flooding,With a quick,high success rate.But restricted by the high temperature reservoir environment and profile control system,the profile control effect and the effective period decrease.This paper briefly introduced the preparation process of new high temperature deep crosslinking system,and the key indicators of thermal stability,plugging rate analysis,and the system is considered to be is a cheap and non-toxic chemical product,fully able to meet the need of high temperature reservoir deep profile control.

The mechanism of anti-channeling agent FCP to block polymer and anti-channel was introduced. The surface activity,blocking ability in heterogeneous formation,thermal stability,erosion resistance caused by water,and oil flooding were examined respectively. The result showed that oil-water interfacial tension was up to 3.127×10-3 mN/m when the content of the anti-channeling agent was 0.1%,which illustrating the agent had good surface activity. The blocking rates in cores with different permeability could be up to 90% when using the anti-channeling agent. The deposit produced from the reaction of anti-channeling agent with HPAM had good thermal stability. The blocking rate of core maintained over 97% after injecting 50 PV of water showing it had strong anti-channeling ability.It had more obvious oil-flooding effect for more heterogeneous parellel cores with the average recovery higher than the one using only water-flooding techniqe by over 10%.Therefore,the oil recovery was enhanced by the means of 'water flooding-HPAM-FCP-water flooding for oil reservoirs with large permeability difference.

The performance of the crosslinked system was evaluated according to the characteristics of the oil reservoir in Gaoqian area.The application results showed that the crosslinked polymer profile-control flooding technology could not only increase the water flooding sweep efficiency,but also improve the oil displacement efficiency.In particular,this technology could inhibit the penetration of edge water/bottom water effectively, and thus improve the development effect of oil fields.

The high water content caused by reservoir heterogeneity and the limited lifetime of offshore platform are the major factors to restrict the seabeach oilfield development. So we have developed the emulsion profile control system to meet the needs of on-site profile control for offshore oilfield. And laboratory evaluation and study are carried out. Study results show that the profile control system is characterized by the short dissolving time, good injectivity, slow cross-linking and strong viscosity. The field test of on-site profile control system of emulsion has been carried out in 5 wells in Chengdao Oilfield, which have gained a fairly good effect.

A linked polymer micro-ball system for deep profile control was developed.Its properties were evaluated in laboratory.The result indicated that the system had good hydration swelling property under high temperature and high salinity conditions.The cores were plugged step by step through"plugging-deformation -breakthrough-deepening-plugging again"cycles.In this way,the deep fluid flow direction was changed and the oil recovery was enhanced.The field application test in 3 wells of Yong 8 Fault Block showed that the polymer micro-ball system plugged high permeability strata effectively,increased water intake capacity of middle or low permeability strata and enhanced oil recovery.

horizontal well is an important method of EOR,which has been extensively used at home and abroad.Along with continual exploittation of Oil field,high water-cut has been the principal problem which highly restricts efficient development on horizontal well and dependable production in Oil field.The use of Conventional Water Shutoff agent is confined by reservoir and well completion type.Therefore,we have invented YN-1 fluid gelling blocking agent.A lot of experiments and effectiveness evaluation have been done.Results indicate the system has properties of heat resistant,salt toleran,pour easily and long stabilization time,hence its application prospects would be great for reservoir with high temperature and high salinity.