不关井脉冲试井理论与实践

Theory and practice of pulse well testing in non shut in oil wells.

关井脉冲试井影响油田生产，需要在不关闭观测井的情况下进行脉冲试井。在单相流体在均质、各向同性孔隙介质中流动等假设下，建立了不关井干扰测试的物理模型，并用扩散方程进行数学描述，得到拉氏空间任意点、任意时间的不关井观测井无因次压力表达式及其压力解析解，应用叠加原理求得井底无因次脉冲激动压力解。不关井脉冲试井的压力响应曲线有波峰和波谷特征，压力响应与产量变化之间有时滞，具有关井脉冲试井压力响应的一般趋势和特征。编制了不关井脉冲试井软件，对大庆油区２口井进行了不关井脉冲试井的设计和分析计算，结果表明不关井脉冲试井是可行的，应用条件是测试井距应控制在３００ｍ以内，脉冲井与观测井的流量之比值应大于０．３。图３参４（陈志宏摘）

Pulse well testing requires well shut in which will affect the well production, and therefore pulse well testing will be better to be carried out in non shut in observation wells. Physical models for pulse well testing are established under the assumptions of single phase fluid flowing in an isotropic homogeneous porous medium, and are described mathematically by a diffusive equation, to obtain an expression of dimensional pressure and an analytical solution of the pressure for the non shut in observation well at any time and any point in Laplace space. Principle of superposition was used to obtain the solution of dimensionless pulse stimulated pressure. Responding curve of well pressure has characteristics of pressure peak and valley, and there is a time lag between pressure response and the change of production rate, and all general tendencies and characteristics in non shut in well testing response. Softwares for non shut in well testing have been made. A design of non shut in well testing in 2 wells were carried out, and the results are analyzed and calculated. Results show that non shut in well testing is technically feasible, with conditions that ①the distance between 2 wells should be less than 300m; and ②the production rate ratio of active well and observation well should be greater then 0.3. Subject