耐高温多元插层膨胀石墨材料及其应用研究

Introduction and application of high temperature resistant multi-component intercalated expanded graphite material

摘要:

随着深井、超深井勘探开发力度的不断加大，深层高温、高压等苛刻条件对钻井液提出了更高的要求。针对常规井筒强化材料较难满足深层、特深层钻井过程中的高温、高压等难题，研究了一种在150 ℃条件下即可膨胀的石墨材料，探索其在高温钻井液中的封堵、降滤失等特性。膨胀石墨是一种具有耐高温（500 ℃）、高膨胀性能、自润滑性的柔性膨胀材料，现有膨胀石墨起始膨胀温度通常都高于300 ℃，无法在井底温度条件下发生膨胀。本文采用多元氧化插层法制备了低于300 ℃即可膨胀的石墨材料，将其起始膨胀温度由300 ℃降至150 ℃，研究了该膨胀石墨多元氧化插层膨胀机理，进一步考察了其在高温钻井液中的封堵、降滤失性能。

关键词:多元插层;膨胀石墨;起始膨胀温度;耐高温;井筒强化;超深井

Abstract:

With the increasing exploration and development of deep and ultra-deep wells， harsh conditions such as high temperature and high pressure put forward higher requirements for drilling fluid. In view of the difficulty of conventional wellbore strengthening materials to meet the high temperature and high pressure in ultra-deep drilling process， research has been conducted on a graphite material which can expand at 150℃， and its characteristics of plugging and fluid loss reduction in high temperature drilling fluid have also been explored. Expanded graphite is a kind of flexible expansion material with high temperature resistance （500℃）， high expansion performance and self-lubricating property. The initial expansion temperature of the existing expanded graphite is generally higher than 300℃， and cannot expand at the bottomhole temperature. The multi-component oxidation intercalation method was used to prepare the expanded graphite material with initial expansion temperature reduced from 300℃ to 150℃. The expansion mechanism of the multi-component oxidation intercalation is examined， and its plugging and filtration performance in high temperature drilling fluid is further investigated.

Key words:multiple intercalated;expanded graphite;initial expansion temperature;high temperature resistance;wellbore strengthening;ultra-deep well