And the variation law of the hole collapse pressure of extended reach well along with hole Angle and azimuth mostly decided by the status of the stratigraphic in-situ stress.

大位移井井壁坍塌压力随井斜角与井斜方位角的变化规律主要由地层的原地应力状态决定。

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Abnormal high pressure systems have formed in Anan Block of Erlian oilfield due to long time of water flooding, kicks, lost circulation and hole collapse are frequently encountered.

二连油田阿南区块，由于长期注水，油气层出现明显的异常高压，地层原始压力遭到破坏，造成了井涌、井塌、井漏等复杂事故。

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In the drilling process, should be kept clean hole soil, encountered hole collapse, shrinkage and other abnormal situations, timely solution.

在钻进过程中，应随时清理孔口积土，遇到塌孔、缩孔等异常情况，应及时研究解决。

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The authority said it was using clay to plug the 13ft (4m) wide hole, caused by the collapse of a mine shaft.

BBC: Stoke-on-Trent mine collapse drains lake

Authorities say they worry the hole is still spreading and the house could collapse at any time.

CNN: A loud crash, then nothing: Sinkhole swallows Florida man

If you were to assume that every point in the universe contained some information, then even a small office would be so densely packed with particles that it would collapse in on itself like a black hole, says Raphael Bousso, a physics professor at the University of California, Berkeley.

FORBES: Flatland?