下扬子地区页岩气井失返性漏失堵漏技术研究——以WY-1HF井为例

doi:10.13809/j.cnki.cn32-1825/te.2021.02.017

Abstract

Abstract:

At present, the leakage of shale gas drilling is quite common in China, and there are few plugging methods suitable for oil-based drilling fluid. The total loss of drilling fluid is still a difficult problem for technicians in the industry. Taking the field operation of Well-WY-1HF as an example, during the drilling of its horizontal well interval by using oil-based drilling fluid, the conventional plugging technology of bridge plug and cement plugging technology of oil well can not work efficiently. Based on the analysis of the characteristics of the loss zones, the effect of different plugging material of oil-base drilling fluid performance have been studied to determine the formula for successful plugging, that is high density （1.89 g/cm³） cement solidified plugging combined with low density （1.17 g/cm³） inorganic gel curing plugging, cooperating with the use of bridge plug with high concentration and large particle. It ensures the subsequent drifting, well logging, the casing and cementing operation smoothly. The successful implementation of this method provides certain reference for the application of shale gas plugging technology in the same area.

Key words: plugging by low density gel, cement plugging, total loss, bridge plugging, horizontal well interval for shale gas, Lower Yangtze Region

CLC Number:

TE28.3

LI Dayong,XIAO Chao,WANG Shengjian,ZHAO Xiaoxiang,ZHU Disi,LIU Haoya. Plugging technology applied for total loss in shale gas wells of Lower Yangtze Region: Taking Well-WY-1HF as an example[J].Reservoir Evaluation and Development, 2021, 11(2): 256-260.

Figures/Tables 2

References 20

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油基钻井液配方	破乳电压（V）
基浆	1 200
基浆+20 %刚性堵漏剂	1 100
基浆+10 %复合堵漏剂	115
基浆+20 %核桃壳	650
基浆+10 %承压堵漏剂	1 100
基浆+5 %棉籽壳	350
基浆+5 %弹性石墨	1 150
基浆+10 %碳酸钙	1 150

油基钻井液堵漏配方		破乳电压（V）
井浆		1 200
配方一	基础配方：井浆+11 %刚性堵漏剂+15 %复合堵漏剂+2 %复合橡胶粒子+2 %改性竹纤维+2 %弹性石墨	125
配方一	补充乳化剂：2 %主乳化剂+2 %辅乳化剂	450
配方二	基础配方：井浆+5 %刚性堵漏剂+20 %复合堵漏剂+1 %棉籽壳+2 %双亲承压堵漏剂+12 %核桃壳	45
配方二	补充乳化剂：2 %主乳化剂+2 %辅乳化剂	420
配方三	基础配方：井浆+19 %核桃壳+7 %竹纤维+2 %双亲承压剂+10 %复合堵漏剂+1 %棉籽壳+2 %复合橡胶封堵剂	120
配方三	补充乳化剂：2 %主乳化剂+2 %辅乳化剂	480

Plugging technology applied for total loss in shale gas wells of Lower Yangtze Region: Taking Well-WY-1HF as an example

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