低渗透油田合理注采井距的确定--以纯41块沙4段低渗透油田为例

以纯41块沙4段低渗透油田为例，从低渗透油田渗流机理出发，分析了造成低渗透油田开发效果差的主要原因。在计算注水井最大井底流压、油井最小井底流压、油水井之间可建立的最大注采压差的基础上，结合室内试验确定的最小启动压力梯度公式计算油田技术极限注采井距，并结合经济合理井距计算结果，确定了油田合理注采井距，并提出了下二步调整方案，实施后取得了显著的效果。该方法为低渗透油田合理井距的确定、提高低渗透油田的开发效果提供了理论依据。

Determination of the Reasonable Producer-Injector Spacing in Low-Permeability Reservoirs-Field Case in the Sha-4 Section of the Chun-41 Block

Taking the low-permeability reservoir in the section Sha-4 in the block Chum41 as an example, this paper analyzes the main reason that result in poor production result of low-permeability reservoirs in terms of percolation flow mechanism. Based on the allowed maximum injection-production pressure difference and combined with the formula of the critical displacement pressure gradient given by the experimental research, formulas calculating maximum producer-injector spacing, reasonable and economic well spacing are developed. In addition, the next spacing adjustment proposal is brought forth. Field experiment is done in Chun41 reservoir and achieved success. The method provides the theoretical basis for determining the reasonable produce-injector spacing in low-permeability reservoirs.