纤维复合无筛管防细粉砂理论研究

粉砂岩和泥质粉砂岩油气藏开发中出砂严重，常规防砂技术效果很差。分析传统防砂工艺的不足，针对细粉砂岩的特点，提出防治细粉砂的总体思路为“解”、“稳”、“固”、“防”、“保”和“增”。用前置解堵液解除储集层损害，用带正电荷支链的软纤维稳砂剂吸附细粉砂颗粒将其聚集成颗粒集合体来稳砂，将硬纤维和涂层砂充填在水泥环外形成类似筛管作用的三维网状复合体，达到无筛管防砂目的，，在裂缝端部脱砂压裂解除近井地带损害，并改善原有渗流条件而增加产量。实验研究表明，纤维可以使复合体的稳砂能力提高十几位到几十倍。图3参8

Theory of screenless fiber resin-coated sand complex fine-silty sand control

Severe sand production takes place in siltstone and pelitic siltstone reservoirs where conventional sand control techniques ended in low efficiency. To overcome the deficiencies of conventional sand control techniques, and according to the characteristics of siltstone, the new theory of fine-silty sand control was presented. The prepad plug remover is utilized to remove formation damage. The soft fibre with positive branch chains absorbs fine-silty grains to form bigger aggregation, and to stabilize fine-silty sand. Netted 3D hard fibre resin-coated sand complex is filled outside the cement mantle to act as an apparent screen for sand control. Frac-Pack and TOS are applied for removing the near wellbore damage, improving flow status and enhancing productivity. Experiments show that fibre may enhance the sand stabilizing ability of complex by 10 times or even more.