The Central District Of Saertu, The Western Part Of The Central Area Of High Concentration Polymer EOR Field Test Research And Application

The western part of the central area of high concentration polymer EOR is in the fieldtest of polymer flooding water-cut recovery stage the first choice of field test of test results formultiple well group, carried out from the laboratory before test and feasibility into formal trialbefore the scattered well test research, experienced a total of nearly seven years, hascompleted a comprehensive test requirements and technology research. Effect of thistechnical report on the field test and the understanding are summarized, mainly to the highconcentration of injected suitable reservoir, oil effect and dynamic adjustment method,displacement variation of pressure conducted exhaustive research.The test in the injection process according to the dynamic change of injection methodadopted slug of different concentration, slow injection of high concentration liquid productionindex drop after the big problem, at the same time, through the analysis of the scattered testwells and test area and connectivity of reservoir development characteristics, established ahigh concentration of wells and well standard, and successfully applied to the South and eastblock of the main reservoir and the North East a zone broken two reservoir, the results areevident. Seven years of practice has made the following understanding:(1) Both the first type of reservoirs or the second types of reservoir, has highpermeability, and high proportion of channel sand connectivity is precondition of highconcentration of normal injection;(2) In the late period of polymer flooding through the injection of high concentration,can effectively suppress the injection profile reversal, keep the use of higher degree;(3) With high concentration conditions of injection wells, the earlier the better transfer ofhigh concentration effect;(4) Injection of high concentration can EOR, test center wells than conventional polymerflooding increased9percentage points more than.The test results show that, compared with conventional polymer injection area althoughinvested a lot of polymers, but also for higher economic benefit, in the subsequent water highwater flooding stage there is no methods to further improve the development effect better,injection of high concentration effectively alleviate the water rise speed, injection period,prolong therefore, the test results of polymer flooding adjustment of oil has importantreference value and guiding significance.We ofen see the words “High-quality hydrocarbon source rock” which are generally cn sag.the thickness of excellent source rocks is50~100meters in commonly.