Horizontal well fracturing method for promoting fracture height extension through two times of acid injection and inter-cluster temporary plugging
A horizontal well and acid injection technology, applied in the field of horizontal well fracturing, can solve the problem of limited fracture height
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Embodiment 1
[0073] A shale gas well in southwestern Sichuan has a vertical depth of 2200m, a sounding depth of 4385m, and a horizontal section length of 1585m. Follow the steps below to retrofit:
[0074] (1) Coiled tubing is used to carry a perforating gun to complete the first stage of perforating operation. Among them, perforating guns are arranged according to 3 perforations in each plane, the number of perforation clusters is 6 clusters, and there are 18 perforation holes in total.
[0075] (2) After the first section of perforation operation, 1m 3 A total of 30m of pretreatment acid is injected per minute 3 . then at 4m 3 / min displacement into low-viscosity slippery water 16m 3 For acid. Subsequent increase in displacement to 6m 3 / min inject low viscosity slippery water 16m 3 Replace the acid, and finally increase the displacement to 8m 3 / min inject low viscosity slippery water 18m 3 replace the acid to ensure that the acid can enter all perforation clusters.
[0076] ...
Embodiment 2
[0097] A shale gas well in southwestern Sichuan has a vertical depth of 2600m, a sounding depth of 4886m, and a horizontal section length of 1585m. Follow the steps below to retrofit:
[0098] (1) Coiled tubing is used to carry a perforating gun to complete the first stage of perforating operation. Among them, perforating guns are arranged according to 3 perforations in each plane, the number of perforation clusters is 6 clusters, and there are 18 perforation holes in total.
[0099] (2) After the first section of perforation operation, with 1.5m 3 A total of 30m of pretreatment acid is injected per minute 3 . then at 4m 3 / min displacement into low-viscosity slippery water 16m 3 For acid. Subsequent increase in displacement to 6m 3 / min inject low viscosity slippery water 16m 3 Replace the acid, and finally increase the displacement to 8m 3 / min inject low viscosity slippery water 18m 3 replace the acid to ensure that the acid can enter all perforation clusters.
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