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川渝页岩气井油膨胀随钻防漏治漏技术及应用
A technology for oil-swelling lost-circulation prevention and control while drilling and its application to shale gas wells, Sichuan-Chongqing area
刘 政1 李茂森1 蒋学光2
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作者单位:1. 中国石油川庆钻探工程有限公司钻井液技术服务公司 2. 中国石油西部钻探工程有限公司钻井液分公司
中文关键字:川渝地区 页岩气井 油基钻井液 油膨胀堵漏剂 随钻防漏治漏技术
英文关键字:Sichuan-Chongqing area; Shale gas well; Oil-based drilling fluid; Oil-swelling lost-circulation agent; Technology of lost-circulation prevention and control while drilling
中文摘要:    川渝地区页岩气水平井使用油基钻井液过程中,井漏问题突出,急需完善现用油基钻井液堵漏技术。为此,自主研发出油膨胀堵漏剂WNPDL 系列,并采用“刚性颗粒+ 油膨胀颗粒+ 薄片+ 纤维+ 沥青”的技术思路,根据不同漏速,形成了1 ~ 5# 油基防漏治漏配方。室内实验结果表明:①油膨胀堵漏剂WNPDL 系列可以抗150 ℃高温能力,抗压35 MPa、回弹率10.0% ~ 12.2 %,在三类基础油中具有好的吸油膨胀能力,膨胀率52% ~ 71 %;②防漏治漏配方与油基钻井液具有好的配伍性能,1# 随钻防漏配方具有好的防漏性能,侵入深度减少率95.0 %。2 ~ 5# 治漏配方对其相应缝板的治漏效果好,7 MPa 条件下的总滤失量在28 ~ 44 mL。形成的油膨胀随钻防漏治漏工艺,在自201H2-5 井的应用效果良好,一次堵漏成功率83 %。结论认为:油膨胀堵漏剂WNPDL 具有温度敏感延时吸油膨胀性,室温下的吸油膨胀率低,随着温度的增加,吸油膨胀率升高,非常适合地面调配具有流动性的堵漏浆,现场施工操作简便,堵漏浆被泵入到漏层后,随着地温的不断升高,逐步吸油膨胀,增强对漏层的封堵能力。
英文摘要:    When oil-based drilling fluid is applied to some shale-gas horizontal wells in Sichuan-Chongqing area, a problem of lost circulation is obvious, so it is in urgent need to improve control technologies for the existing oil-based drilling fluid. In this study, An oil-swelling lost-circulation agent of WNPDL series was developed independently. And according to the technical idea of "rigid particle + oil-swelling particle + slice + fiber + bitumen", No. 1 to No. 5 formulas of oil-based lost-circulation prevention and control were develped for different loss rates. Results show that (1) the oil-swelling lost circulation agent of WNPDL series has temperature resistance of 150 ℃ , compressive strength 35 MPa, and resilience rate of 10.0-12.2 %, and its oil-absorbed swelling capacity in three kinds of base oil is good with swelling rate of 52-71 %; and (2) these formulas are well compatible with oil-based drilling fluid. In which, No. 1 formula has good lost-circulation prevention performance and the decrease rate of its invasion depth is 95.0 %, No 2 to No, 5 formulas have good lost-circulation control effect to corresponding fracture plate and the total loss under 7 MPa ranges from 28 ml to 44 ml. In addition, one technology of oil-swelling lost-circulation prevention and control while drilling was developed, and its application to Zi 201H2-5 well obtained better effect with the primary success rate of lost-circulation control up to 83 %. In conclusion, the oil-swelling lost circulation agent of WNPDL series has temperature-sensitive delayed oil-absorbed swelling property. Its oil-absorbed swelling rate is low under room temperature, and may increase with increasing temperature, so it is quite suitable for preparing a kind of flowing lost-circulation slurry on the ground. And besides, its field construction and operation is convenient. After this slurry is pumped into thief zone, it absorbs oil and swells gradually with increasing geotemperature, so as to enhance certain plugging capacity to the thief zone.
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国内统一连续出版物号:CN51-1159/TE |国内发行代码: |国际标准出版物号:ISSN1673-3177 |国际发行代码:
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