威远页岩气水平井控缝防窜技术优化与应用

doi:10.13809/j.cnki.cn32-1825/te.2021.01.011

Abstract

Abstract:

Due to the large natural fractures and the single extension of hydraulic fractures, gas channeling occurs easily during fracturing of multi-platform, as a result the instantaneous gas production of adjacent wells is reduced by at most 93 %, and the wellhead pressure is increased by at most 12 MPa, which seriously affects the fracturing development effect of shale gas. For this complex situation, a fracture control and channeling prevention technology for horizontal wells of shale gas is proposed, which mainly includes fracture-length control of multiple fracture and steering fracture. By the measures of increasing the number of hydraulic fractures to reduce the net pressure, or using temporary plugging materials to steer hydraulic fractures, the extension direction of hydraulic fractures has been controlled and the fracture complexity has been increased to reduce the interacting of adjacent wells, and finally make the shale gas effectively develops in the well controlled gas drainage area. The numerical simulation shows that after applying this technology, the effective fracture length is shortened by 11.9 %~24.8 % The field application effect is obvious, the fracture length monitored by real-time micro seismic is reduced by 24 %, and the real-time monitoring pressure of adjacent wells does not change. The fracture control and channeling prevention technology in horizontal wells of shale gas does not only provides theoretical support for field application, but also reduces the probability of complex situations and improves the production of single well.

Key words: shale gas, horizontal well, fracture control, steering, interference, application

CLC Number:

TE25637

Lingxiang Zeng. Optimization and application of fracture control and channeling prevention technology in Weiyuan shale gas horizontal well[J]. Reservoir Evaluation and Development, 2021, 11(1): 81-85.

Figures/Tables 4

Fig. 1

Fig. 2

Fig. 3

Table 1

References 20

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改造段	压裂井段（m）	簇数	段长（m）	泵注排量（m³/min）	一般泵压（MPa）	停泵压力（MPa）	入地液量（m³）	入地砂量（t）
第20段压裂	3 760 ~ 3 823	3	63	11.6	66 ~ 68	54．0	1 651.3	116.3
第21段压裂	3 697 ~ 3 760	3	63	11.6	64 ~ 66	51.1	1 698.0	114.7
第22段压裂	3 634 ~ 3 697	3	63	11.6	68 ~ 70	54.8	1 780.8	110.6
第23段压裂	3 571 ~ 3 634	3	63	11.6	62 ~ 65	50.5	1 763.6	100.7
第24段压裂	3 507 ~ 3 571	3	64	11.6	62 ~ 64	50.0	1 741.7	101.1
第25段压裂	3 443 ~ 3 507	4	64	11.6	60 ~ 62	51.0	1 701.0	113.0
第26段压裂	3 379 ~ 3 443	4	64	11.6	59 ~ 60	48.3	1 641.6	110.6
第27段压裂	3 316 ~ 3 379	4	63	11.6	59 ~ 60	48.3	1 594.1	113.1
第28段压裂	3 252 ~ 3 316	4	64	11.6	56 ~ 58	48.0	1 611.7	113.1
第29段压裂	3 188 ~ 3 252	4	64	10.0 ~ 11.6	55 ~ 58	47.0	1 630.4	111.7
第30段压裂	3 124 ~ 3 188	4	64	11.5	57 ~ 60	47.0	1 667.0	105.7
第31段压裂	3 060 ~ 3 124	4	64	11.5	55 ~ 57	46.3	1 579.4	110.8

Optimization and application of fracture control and channeling prevention technology in Weiyuan shale gas horizontal well

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