The Technology of SXJD-Ⅰ Type Low Damage Temporary Plugging Workover Fluid
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摘要:
为满足老油田修井需求、并兼顾储层保护，以KCl溶液为基液，通过优化屏蔽暂堵主剂、胶体保护剂及屏蔽暂堵辅剂加量，形成了SXJD-Ⅰ型低伤害暂堵修井液。室内评价表明：该修井液具有良好的滤失性和堵漏性能，暂堵颗粒可迅速被油井产出液中的油和水分解，缩短修井后的排水周期；岩心渗透率恢复率大于88.0%，较常规修井液渗透率恢复率大幅提高。SXJD-Ⅰ型低伤害暂堵修井液在胜利油田GU249井和哈萨克斯坦KKM油田301井、190井等3口井进行了现场应用，其封堵效果良好，能够满足修井作业需要，排水复产期缩短40.0%以上。研究表明，SXJD-Ⅰ型低伤害暂堵修井液的封堵和储层保护效果良好，具有推广应用价值。
Abstract:In order to satisfy the requirements of both workover and reservoir protection in mature oilfields, the SXJD-Ⅰ type low damage temporary plugging workover fluid was developed by taking the KCl solution as the base fluid, and optimizing the shielding temporary plugging main agent, colloidal protective agent and temporary plugging assisting agent. The inside evaluation showed that the workover fluid had good filtration and plugging performance, the temporary plugging particles could be quickly dissolved by oil and water in the produced fluids, which significantly reduced the water drainage period after workover. With a core permeability recovery rate greater than 88.0%, it exhibited a significantly enhanced permeability recovery rate , which was better than the conventional workover fluids. SXJD-Ⅰ type low damage temporary plugging workover fluid has been tested in three wells: Well GU249 in Shengli Oilfield, Well 301 and Well 190 in KKM Oilfield, Kazakhstan, where they achieved a good sealing effect. The new fluid can meet the needs of workover operation, and the water drainage period can be shortened by 40.0% or more. The research indicated that SXJD-Ⅰ type low damage temporary plugging workover fluid had good sealing and reservoir protection effect, with sound popularization and application prospects.
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Keywords:
- workover fluid /
- formation damage /
- rheology /
- sealing performance /
- drainage period
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表 1 屏蔽暂堵主剂加量优化试验结果
Table 1 Optimization results of the dosage of main shielding temporary plugging agent
屏蔽暂堵主剂
加量，%六速旋转黏度计读数 API滤失量/
mLϕ600 ϕ300 ϕ200 ϕ100 ϕ6 ϕ3 0.5 5 3 1.5 1 0.5 0.1 > 120 1.0 14 7 4.0 3 0.5 0.1 97 1.5 38 21 15.0 9 2.0 1.0 71 2.0 96 65 53.0 35 7.0 4.0 34 
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表 2 胶体保护剂加量优化试验结果
Table 2 Experimental results of optimizing the dosage of colloidal protective agent
胶体保护剂
加量，%六速旋转黏度计读数 API滤失量/
mLϕ600 ϕ300 ϕ200 ϕ100 ϕ6 ϕ3 0.1 73 52 42 29 8 6 7.5 0.2 92 74 66 52 19 15 5.5 0.3 102 88 78 64 28 23 5.2 注：修井液基液为基液+1.5%屏蔽暂堵主剂
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表 3 屏蔽暂堵辅剂加量优化试验结果
Table 3 Experimental results of optimizing the dosage of shielding temporary plugging assisting agent
屏幕暂堵辅剂
加量，%六速旋转黏度计读数 API滤失
量/mLϕ600 ϕ300 ϕ200 ϕ100 ϕ6 ϕ3 1.0 88 71 63 51 18 15 5.2 2.0 92 74 66 52 19 15 5.0 3.0 95 75 68 55 20 18 5.0 注：修井液基液为基液+1.5%屏蔽暂堵主剂+0.2%胶体保护剂。
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表 4 SXJD-Ⅰ型低伤害暂堵修井液抗温能力评价
Table 4 Evaluation on the temperature resistance of SXJD-Ⅰ type low damage temporary plugging workover fluid
测试条件 六速旋转黏度计读数 API滤失量/
mLϕ600 ϕ300 ϕ200 ϕ100 ϕ6 ϕ3 老化前 92 74 66 52 19 15 5.0 老化后 90 71 63 50 16 13 6.2
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表 5 SXJD-Ⅰ型低伤害暂堵修井液封堵效果
Table 5 Sealing effect of SXJD-Ⅰ type low damage temporary plugging workover fluid
砂床粒径 修井液类型 侵入砂床深度/cm 滤失量/mL 老化前 老化后 老化前 老化后 40/60目 常规修井液 全浸透 全浸透 全滤失 全滤失 SXJD-Ⅰ型低伤害
暂堵修井液3.5 5.5 0 0 120/150目 常规修井液 全浸透 全浸透 全滤失 全滤失 SXJD-Ⅰ型低伤害
暂堵修井液2.5 5.2 0 0
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表 6 现用常规修井液岩心污染实验结果
Table 6 Core pollution test results of the existing conventional workover fluid
岩心
编号气测渗透率/
mD煤油渗透率/mD 渗透率
恢复率，%污染前 污染后 K103-1 2.61 0.163 0.058 35.6 K137-1 3.93 0.262 0.136 51.9
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表 7 SXJD-Ⅰ型低伤害暂堵修井液岩心污染实验结果
Table 7 The water drainage and production resuming of well 301 in KKM Oilfield by using SXJD-Ⅰ type low damage temporary plugging workover fluid
岩心
编号气测渗透率/
mD煤油渗透率/mD 渗透率
恢复率，%污染前 污染后 K103-2 3.50 0.233 0.219 94.0 K137-2 6.88 0.573 0.508 88.7
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