中等胶结储层气井出砂临界流量实验测试技术

中等胶结砂岩气藏储层出砂危害极大，气井的出砂临界流量确定尤为重要。克服了以往确定出砂临界流量的现场试验方法成本高及理论计算精度低等不足，研制了测定气井出砂临界流量的实验装置并制定了测定气井出砂临界流量的实验方法。进行了裸眼完井条件下的室内气井出砂临界流量模拟实验，测定了不同生产压差下的气体流量及出砂量，确定了气井出砂临界流量。并利用临界流量反推地层条件下的出砂临界生产压差及产能，形成中等胶结储层气井出砂临界流量的实验测试技术，在南海某气田进行了成功应用。结果表明：该实验测试技术具有先进性和可靠性。

The Sand Production Critical Flow Test Technology of Gas Well in Moderate Cemented Formation

Sand production is of great harm to the moderate cemented formation in gas reservoir，so it is necessary to determine the sand production critical flow. In order to overcome the shortcomings in traditional sand production critical flow determining methods，such as high cost of field test and low computational accuracy of theoretical calculation，this paper shows that test equipments and test methods determine the sand production critical flow for gas well. The lab simulation test for determining the sand production critical flow in open hole completion is carried out. We measure the gas flow rate and sand production rate under different drawdown pressure. Finally, the sand production critical flow of gas well was determined. The test technology for determining the sand production critical flow of gas well is based on the critical flow rate back stepping strata of back-derive critical sand production drawdown pressure and productivity. This test method has been successfully used in a gas field of South China Sea. The result shows the advancement and reliability of this test method.