A.洗壓井→起出原管柱→探砂石→沖砂→通井→洗井B.洗壓井→起出原管柱→探砂面→沖砂C.洗壓井→探砂面→沖砂→起出原管柱D.洗壓井→起出原管柱→通井→洗井
A.7%B.10%C.15%D.30%
A.25B.30C.40D.50