普光气田是我国迄今发现的最大的高酸性整装气田，但由于其地质环境异常复杂，目的层深且存在“斜、塌、喷、漏、硬、毒”等世界级工程技术难题，钻井难度大且风险高。分析了普光气田复杂的地质特点，提出了井身结构优化设计和管材优选思路。根据开发认识的加深及要求论述了4种相应井身结构优化方案，介绍了应用效果并作了相应分析。通过井身结构优化设计实现了用尽可能少的套管程序封隔地层的必封点，提供尽可能大的完井井眼，以保证固井质量和满足高产需求，从而最终实现安全、经济的开发目的。

Puguang Gas Field is the largest high acid marine strata mono-block gas field found in China so far. As the geologic structure is extremely complex, the target stratum is ultra deep, the drilling is rather difficult and high risk, facing so many world-classic engineering problems as high deviation, cavy, blowout, leakage, hard formation, poison, and etc. This paper analyzes the complicated geological characteristics in Puguang gas field, proposes the optimization idea and technique of well structure design and tubing selection, coming up with four casing program optimization schemes according to the knowledge and demand of development, and introduces the application effect and corresponding analysis. The optimization design for well structure achieved to seal off necessary sections of stratum by the simplest casing program, provided the maximum wellbore size,to ensure the cementing quality , meet with the high productivity requirement, and reach the final goal of developing the gas field in a safe and economy manner.