Recognition And Management Decision An Of Inefficient Circulation Channel In Jianyucha Oilfield

Waterflooding is adopted in most oilfields worldwide. Especially in China, more than90%of the fields are waterflooding oilfields. In our country, so many waterflooding oilfieldshave been in the later stage of waterflooding development, and many oil wells have been withhigh water cut or super high water cut. The reservoir structure has been changed for longperiod of washing by injected water. The big pore channel has been come into being betweenoil and water well, which bring on the low efficiency circle of injected water and decrease theoutput of the oil well and the oilfield. The wells and layers with low efficiency circle have tobeen controlled by measures such as profile control or water plugging and so on, so as toimprove the effect of water flooding, and the key is to recognize them.For distinguishing feature of extra low permeability reservoir characteristics, we canmake clear the general geology, current status of exploitation and open questioning in thedemonstrate zone by combining with the analysis method of reservoir engineering and oilfieldproduction data. Furthermore, we summed up the changing characteristics of water contentratio in demonstration zone rate of Jianyucha oilfield by combining with the analysis methodof reservoir engineering and oilfield production data. On the basis of correlate studies andinvestigation at home and abroad, we conduct study of the generated mechanism of the loweffective circulation channels, and confirm the generated reasons of the inefficient circulationchannel and its present character in oilfield development. Combined with the actual situationin demonstration zone of Jianyucha oilfield, we can conduct decision analysis of profilecontrol and plugging and determined well and layer of the plugging, by using of the pressureindex (PI) decision technology and reservoir engineering (RE) fuzzy comprehensive method.According to the analysis of the causes of high water well, we can confirm thecharacteristics of genetic types and the corresponding plugging measures. Therefore, theoverall adjusting scheme was made for demonstration area. Choosing5typical wells that loweffective circulation was serious were as one of the first well construction design.And according to the different types of formation, we can take different plugging schemedetermine the construction parameters and forecast the plugging effect.