Formations penetrated by the Heba 1 Well are complicated, including lower ultra high pressure gas zone with hydrogen sulfide, plastic gypsums, leakage formations, etc.

• 河坝1井钻遇地层复杂,下部有含硫化氢的超高压天然气层、塑性盐膏层、漏失地层等,易出现井漏、喷漏同存、卡钻等井下复杂情况和事故。