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南海莺琼盆地高温高压井堵漏技术

韩成1 黄凯文1 罗鸣1 刘贤玉1 邓文彪1

(1.中海石油(中国)有限公司湛江分公司, 广东湛江 524057)

【摘要】南海西部莺琼盆地地质条件复杂,井底温度和压力高,钻进目的层过程中井漏频发。为解决井漏问题,在分析发生井漏主要原因的基础上,提出了将耐高温刚性堵漏材料和耐高温弹性堵漏材料相结合的思路。在钻井液中添加耐高温刚性堵漏材料DXD和耐高温弹性石墨堵漏材料TXD配制成堵漏浆,DXD在诱导裂缝中架桥,TXD在压差作用下充填于诱导裂缝剩余孔隙中,防止诱导缝进一步开启扩大,封堵诱导裂缝,提高地层承压能力。室内性能评价表明,堵漏浆密度最高可达2.40 kg/L,抗温能力可达200℃。堵漏浆在莺琼盆地多口高温高压井进行了应用,堵漏效果较好,堵漏成功率由采用常规堵漏技术的30%左右提高到了80%以上。这表明,该堵漏浆可以封堵莺琼盆地目的层的诱导裂缝,提高地层的承压能力和堵漏成功率,解决井漏频发的问题。

【关键词】 高温高压井;井漏;诱导裂缝;堵漏剂;莺琼盆地;南海;

【DOI】

【基金资助】 国家科技重大专项“莺琼盆地高温高压天然气富集规律与勘探开发关键技术(三期)”(编号:2016ZX05024-005); 中海石油科技重大项目“莺琼盆地高温高压钻完井液、固井工艺研究与应用”(编号:CNOOC-KJ 135ZDXM 24 LTD ZJ 02);

Plugging Technology for HTHP Wells in the Yingqiong Basin of the South China Sea

HAN Cheng1 HUANG Kaiwen1 LUO Ming1 LIU Xianyu1 DEND Wenbiao1

(1.CNOOC China Limited, Shenzhen Branch, Zhanjiang, Guangdong, China 524057)

【Abstract】The Yingqiong Basin in the western South China Sea is characterized by complex geological conditions, high bottomhole temperatures and pressures, and lost circulation which occurs frequently during drilling into the target layer. In order to solve the problem of frequent lost circulation in the target layer, the main causes of lost circulation were analyzed; the idea of combining the high temperature resistant rigid plugging materials with high temperature resistant elastic plugging materials was followed; and a plugging slurry was prepared by adding DXD (high-temperature resistant rigid plugging material) and TXD (high-temperature resistant elastic graphite plugging material) into drilling fluid. The performance evaluation showed that the density of plugging slurry could reach 2.40 kg/L and the temperature resistance could reach 200 °C. The DXD could form bridges in the induced fractures, while the TXD could enter the residual pores of induced fractures under pressure difference, preventing the induced fractures from further opening and expanding, blocking the induced fractures and improving the pressure-bearing capacity of formation. This plugging slurry was applied in several high temperature and high pressure (HTHP) wells in the Yingqiong Basin with the success rate of plugging increasing from 30% to 80%, indicating that the plugging slurry could block the induced fractures in the target layer of the Yingqiong Basin, improve the pressure-bearing capacity of formation and the success rate of plugging, and solve the problem of frequent lost circulation in the target layer.

【Keywords】 HTHP well; lost circulation; induced fractures; plugging agent; Yingqiong Basin; the South China Sea;

【DOI】

【Funds】 National Science and Technology Major Project of “HTHP Gas Enrichment Principle and Key Exploration and Development Technologies in the Yingqiong Basin (Phase III)” (2016ZX05024-005); CNOOC’s Major Scientific Research Project of “Study and Application of HTHP Drilling and Completion Fluids and Cementing Technology in the Yingqiong Basin” (CNOOC-KJ 135ZDXM 24 LTD ZJ 02);

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This Article

ISSN:1001-0890

CN:11-1763/TE

Vol 47, No. 06, Pages 15-20

November 2019

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Article Outline

Abstract

  • 1 Analysis of causes of lost circulation
  • 2 Plugging practice and performance evaluation
  • 3 Field applications
  • 4 Conclusions and suggestions
  • References