The Development Regularity And Well Pattern Adjustment To Saling Group In Sabei Area Oil Field

The sari formation is a part of the oil-bearing combination in the middle part of Changyuan,Daqing,which is an unused reservoir.A few years' research has shown that the characteristics of diagenesis,the sensitivity of reservoir,and the difficulty of mini ng and reforming measures are the characteristics and development status of the S0 f ormation.As the source is relatively close,the thickness of the sari formation in the no rth development area is large.In order to further study the feasibility of the developme nt of the Sam,it is very important to study the adaptability of the well spacing,water injection development technology for reservoir sensitivity,and to adapt to the transform ation technology of the characteristics of the oil layer.In view of the present situation,this paper has carried out the research work on the field test of the SAM group dev elopment in the SAM Development Zone,aiming at making clear the law of the devel opment of the SAM group and adjusting the sequence of the well network.The compr ehensive study has made the following conclusions and understandings:Through the comparative analysis of the La Sa Xing oilfield,the SA group is divi ded into two sandstone groups and 8 small layers,named S_O1-S_O8from top to bottom.There is a 8m thick mudstone interlayer between S_O3and S_O4,which is divided into two sandstone groups:sz0 and sz.The sand bodies of the sari formation in the experim ental area are mainly divided into two types:the underwater distributary channel sand and the front sheet sand.The reservoir of sac is mainly siltstone or argillaceous siltstone,which is mostly muddy siltstone with oil spot and muddy siltstone.The reservoir pore development is poor,the connectivity is poor,oil soaked and oil spots are the dominant,the total amou nt is up to 72.1%,and the oil production in a small number of thick oil layers is bett er than that of the outside reservoir.According to the principle of combination of layers,the design and optimization o f three sets of strata combination schemes are carried out,and a combination scheme o f the water flooding development test of the S₀ Group oil layer is determined.The firs t one is ZnO group sublevel single mining combination,and the other two are ZnO co mbined mining combination.The plan three is the combination of sz0 and S₁.In general,the adaptability of the well spacing to the distribution of sand bodies i n 200 m well is relatively high.Considering the degree of water flooding control,the w ell spacing of 200 m and below can meet the requirements of water drive development of S₀ group.Taking into account of the poor physical property of the Sai group and the knowledge obtained from the sac test,the tracer test under the 142 m well spacing has been confirmed,so it is reasonable to use 175 m in the injection and production w ell spacing in the Sabei test area.The reservoir development test of the SA Bei zero group is divided into two ste ps.The first step is the oil gathering of the zero oil group,the second step SA zero gr oup and the S₁.The recovery rate of the well popularized 175 m anti nine point well n etwork is calculated.The results show that the final recovery rate of water flooding is20.12%,the recoverable reserves are 7.98×10⁴t,and the average well recoverable reser ves of the total well number are 2280 t.