海上疏松砂岩储层压裂解堵裂缝规模优化设计方法

Optimization Design of Fracture Scale for Fracturing and PluggingRemoval in Offshore Unconsolidated Sandstone Reservoirs

针对受污染的海上疏松砂岩油井所需的最优压裂规模不确定问题,开展了不同裂缝长度和导流能力对油井生产的影响规律研究。采用油藏数值模拟和压裂效果分析手段,设计了裂缝规模优化计算方法。研究表明:污染程度对油井的影响明显大于污染半径,明确了短缝高导流能力的目标是削弱污染程度;裂缝半长大于污染区范围后油井生产具有含水上升趋势,裂缝半长优化为污染半径;储层渗透率越高,裂缝导流能力增大带来的油井提液幅度越趋于平缓,所需导流能力相对越小。

Aiming at the uncertainty of the optimal fracturing scale required by the polluted offshore unconsolidated sandstone oil wells,the effects of fracture length and conductivity on oil well production are studied.The fracture size optimization calculation method is obtained based on the reservoir numerical simulation and fracturing effect analysis.The results show that the influence of pollution degree on oil well production is obviously greater than that of pollution radius,and short fracture and high conductivity can reduce the pollution degree.When the half length of the fracture is larger than the radius of pollution area,the water content of the oil well tends to rise,and the half length of the fracture is optimized as the radius of pollution area.The higher the permeability of the reservoir,the more gentle the liquid extraction increase of the oil well caused by the increase of fracture conductivity,and the smaller the required conductivity.