一种储层保护用酸溶性纤维的合成及现场应用

Synthesis and field application of acid-soluble fiber for plugging leakage

摘要:

储层伤害机理有被广泛的研究，但是储层保护技术的研究还有待进一步深入。本文针对储层保护的重要性，使用碱氧化法制备了一种酸溶性纤维，通过优选其粒径分布，评价其酸溶率，证实该纤维和刚性颗粒配合使用时可以达到储层保护的目的。优选了储层保护用钻井液处理剂（润滑剂、降失水剂和包被剂），润滑性、降失水和流变性评价显示处理剂具有良好润滑性、降失水性和流变性能，研发了一套储层用的钻井液体系。酸溶性纤维和储层用钻井液体系一同使用时，其流变性满足施工要求，抗盐性能优异，沉降稳定性良好，同时具有优异的储层保护性能。通过在沁水区块某煤层气井的现场应用，展示了酸溶性纤维和储层用钻井液优异的性能，有望进一步推广应用。

Abstract:

Reservoir damage mechanism has been widely studied， but the research of reservoir protection technology needs to be further in-depth. In view of the importance of reservoir protection， an acid soluble fiber is prepared by alkali oxidation method. By optimizing its particle size distribution and evaluating its acid solubility， it is confirmed that the combination of the fiber and rigid particles can achieve the purpose of reservoir protection. Drilling fluid additives （lubricants， fluid loss reducing agents and coating agents） for reservoir protection were optimized. The evaluation of lubricity， fluid loss reduction and rheology showed that the additives had good lubricity， fluid loss reduction and rheological properties. A drilling fluid system that can be used in reservoir was prepared. When acid soluble fiber and drilling fluid for reservoir are used at the same time， its rheological property can meet the construction requirements， with excellent salt resistance， good sedimentation stability and excellent reservoir protection performance. The field application in A coalbed methane well in Qinshui Block shows the excellent performance of acid soluble fiber and drilling fluid for reservoir， which is expected to be further applied.