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辽河油田是我国重要的稠油开发基地,其中15个主力生产区块是以蒸汽吞吐开采为主。蒸汽吞吐开采是注蒸汽降粘、消耗油藏弹性能的开采过程。随着油井的多轮次吞吐,油藏压力不断降低,平均生产5～6个吞吐周期,采出程度可达到10%～15%,油藏压力下降3.5～5.0MPa。在这时如加密井网,防止油藏污染问题尤其应引起足够的重视。在钻井和完井过程中,由于水泥浆的侵入,对油藏有不同程度污染,导致油井产能下降。而稠油老区加密调整井网,在油藏压力较低时钻井,这种污染会更强烈。辽河的齐40块和杜66块油藏原始压力分别是8.9MPa和9.7MPa,当采出程度达到11.51%和10.91%、油藏压力降到4.8MPa和5.5MPa时,井网分
Liaohe Oilfield is an important heavy oil development base in China, of which 15 main production blocks are mainly steam stimulation. Steam huff and puff is the steam injection process that reduces viscosity and consumes elastic energy of the reservoir. With the multiple rounds of well stimulation, the pressure in the reservoir is continuously decreasing, with an average production period of 5-6 cycles. The recovery rate can reach 10% -15% and the reservoir pressure decreases by 3.5-5.0 MPa. At this time, such as the well network encryption, reservoir pollution prevention should pay particular attention. During the drilling and completion process, due to the intrusion of cement slurry, the oil reservoirs are polluted to different degrees, resulting in the decrease of oil well productivity. The old heavy oil wells to adjust the well network encryption, drilling in the reservoir pressure is low, this pollution will be more intense. The original pressures of Qi 40 and Du 66 reservoirs in Liaohe River are 8.9 MPa and 9.7 MPa, respectively. When the recovery reaches 11.51% and 10.91%, and the reservoir pressure drops to 4.8 MPa and 5.5 MPa,