文23地下储气库关键工程技术

文23储气库是我国中东部地区最大储气库，工程建设过程中遇到固井难度大、井漏严重、井筒封闭性评价困难、注采管柱要求高和老井井况复杂等技术挑战，为此开展了盐膏层固井、超低压储层防漏及保护、盖层段井筒封闭性评价、注采完井管柱设计和老井封堵与评价等技术攻关，形成了文23储气库关键工程技术，解决了文23储气库建设中的技术难题。文23储气库关键技术在现场应用后，固井质量显著提高，钻井液漏失量降低52.3%，井筒封闭性评价提高了施工决策效率，保障了储气库工程建设的顺利施工。文23储气库示范工程的建设，为类似储气库建设提供了技术保障和示范。 

The Key Engineering Techniques of the Wen 23 Underground Gas Storage

The Wen 23 underground gas storage area is the largest one in the central and eastern China. It has faced several challenges in its construction phase, such as difficulty in cementing, serious leakage, difficulty in evaluating the wellbore sealing, high requirements on the injection/production pipe string and the complicated conditions of existing well. To optimize operations, technical studies were conducted on the aspects of salt formation cementing, ultra-low pressure reservoir leakage-prevention and protection, wellbore sealing evaluation, injection/production and completion string design, and existing wells plugging and evaluation, and major technical difficulties during the construction of Wen 23 gas storage reservoir are solved. The key engineering techniques applied in the Wen 23 underground gas storage, the cementing quality has been significantly improved, the loss of drilling fluid has been reduced by 52.3%, and the wellbore sealing evaluation has improved the efficiency of construction decision-making. The construction of Wen 23 underground gas storage demonstration project provides technical supports and demonstration for the construction of similar projects.