CAJ | 학술논문

对于中高渗透砂岩,导致储层损害的主要因素是钻井液固相和滤液的侵入.为了确定钻井液固相和滤液侵入深度,根据质量守恒方程和径向摩阻公式,在考虑内泥饼的情况下,建立了钻井液固相和滤液动态侵入储层的深度模型.并将室内API滤失实验和动态岩心污染实验的结果应用到该模型中.预测结果表明,随着岩心渗透率的增加,钻井液固相侵入深度也逐渐增加,利用理想充填暂堵技术能减小钻井液固相的侵入深度.影响钻井液滤液侵入深度的主要因素有压差、滤液黏度、外泥饼渗透率、外泥饼厚度、内泥饼渗透率以及储层渗透率变化.
대우중고삼투사암,도치저층손해적주요인소시찬정액고상화려액적침입.위료학정찬정액고상화려액침입심도,근거질량수항방정화경향마조공식,재고필내니병적정황하,건립료찬정액고상화려액동태침입저층적심도모형.병장실내API려실실험화동태암심오염실험적결과응용도해모형중.예측결과표명,수착암심삼투솔적증가,찬정액고상침입심도야축점증가,이용이상충전잠도기술능감소찬정액고상적침입심도.영향찬정액려액침입심도적주요인소유압차、려액점도、외니병삼투솔、외니병후도、내니병삼투솔이급저층삼투솔변화.
The invasion of solids and filtrate in drilling fluids is the key reason to cause damage of high-permeability sandstone reservoir. A model for defining the invasion radius of solids and filtrate in drilling fluids under the dynamic condition was built up, according to the mass conservation equation and radial friction losses equation. In order to confirm some parameters in the model, the experiences of filtration API and dynamic fluid loss were tested in laboratory, and the results from the API filter test and dynamic fluid loss test were applied to the model. The prediction results indicated that the invasion radius of solids became great when the core permeability increased. The ideal filling temporary plugging technique could reduce the invasion radius of solids in drilling fluids. The pressure difference,filtrate viscosity,permeability and thickness of external and internal mud cakes could affect the filtration invasion radius.