一种获取油藏静压的新方法——以渤海P油田为例

A new method of obtaining reservoir static pressure--by taking Bohai P oilfield as an example

油藏静压是油藏动态管理过程中重要的一项参数,渤海P油田一般采用随钻测压折算法、不稳定试井法以及油藏动态经验法预测油藏静压。但近年来多层合采使得各层压力差异性强,压力复杂,且目前新钻井随钻测压资料以及关井不稳定试井数据越来越少,仅凭动态经验获取的静压数据,其准确性很难保证。本文首次提出基于油井起泵阶段压力数据,根据井筒储集效应下压力管流和渗流耦合理论,利用直线回归系数(R2)极大值法预测油藏静压的方法。经过与渤海P油田24口井的随钻测压折算油藏静压、试井解释静压和油藏动态经验预测静压进行对比,结果吻合程度高,且具有短时、高效、成本低的特点,为新钻井压力预测提供了一种新方法。

Reservoir static pressure is one of the important parameters in the process of reservoir dynamic management.In Bohai P oilfield,the converting method for pressure measurement while drilling,unstable well test method and reservoir dynamic knowledge are generally used to predict static pressure.In recent years,due to the multi-layer production,the pressure difference of each layer is strong,and the pressure is complex.At present,the data of pressure measurement while drilling and unstable well test are less and less.The accuracy of static pressure data obtained only by dynamic knowledge is difficult to guarantee.In this paper,based on the pressure data of pumping stage and the theory of coupling point of pressure pipe flow and seepage flow under wellbore reservoir effect,the method of predicting reservoir static pressure by linear regression coefficient(R2)maximum method is proposed for the first time.Compared with converted reservoir static pressure while drilling,static pressure interpreted by well testing and static pressure predicted by reservoir dynamic cognition of 24 wells in Bohai P oilfield,and the results were highly consistent.This method has the characteristics of short time,high efficiency and low cost,which provides a new method for new drilling pressure prediction.