Analyses of the Ballooning Effect and its Affecting Factors in Drilling Shallow Formations in Deep Water

LUO Ming; GAO Deli; HUANG Honglin; LI Jun; YANG Hongwei

doi:10.12358/j.issn.1001-5620.2022.06.002

Volume 39 Issue 6

Nov. 2022

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LUO Ming, GAO Deli, HUANG Honglin, et al.Analyses of the ballooning effect and its affecting factors in drilling shallow formations in deep water[J]. Drilling Fluid & Completion Fluid，2022, 39（6）：668-676 doi: 10.12358/j.issn.1001-5620.2022.06.002

Citation:

LUO Ming, GAO Deli, HUANG Honglin, et al.Analyses of the ballooning effect and its affecting factors in drilling shallow formations in deep water[J]. Drilling Fluid & Completion Fluid，2022, 39（6）：668-676 doi: 10.12358/j.issn.1001-5620.2022.06.002

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Analyses of the Ballooning Effect and its Affecting Factors in Drilling Shallow Formations in Deep Water

doi: 10.12358/j.issn.1001-5620.2022.06.002

LUO Ming^{1, 2},
GAO Deli¹,
HUANG Honglin^1
,,
LI Jun^{1, 3
,
,},
YANG Hongwei¹

1.
China University of Petroleum-Beijing, Beijng 102249
2.
CNOOC China Limited, Hinan Branch, Haikou, Hainan 524000
3.
China University of Petroleum-Beijing at Karamay, Karamay, Xinjiang 834000

Received Date: 2022-06-07
Rev Recd Date: 2022-07-02
Publish Date: 2022-11-30

Abstract

Abstract

Ballooning effect encountered during drilling is easy to be taken as well kick and the well is then killed. This operation often results in severe mud losses, increasing the risks and costs and causing serious harm to the safety and efficiency of deep-water drilling. To solve this problem, the mechanisms of ballooning effect was studied, and the COMSOL software was used to simulate the whole process of ballooning during drilling in the shallow formations in deep water area. The effects of formation characteristics, drilling fluid properties and pressure differential on the ballooning effect were studied. The simulation results have shown that the ballooning effect taking place in the shallow formations in deep water area is a permeable mechanism. The permeable ballooning effect is very easy to happen in formations with low elastic modulus, low Poisson’s ratio, high porosity and high permeability. This kind of ballooning effect can be inhibited with high viscosity high yield point drilling fluids, and drilling with low pressure differentials (low density, low flow rate). Thus, when drilling formations with low elastic modulus, high Poisson’s ratio, low porosity and high permeability, measures should be ready in advance, for example, treating the mud with filter loss reducers, reducing pump rate, to minimize the impact of the ballooning effect. This study is of reference importance to the identification, prevention and plan for the controlling of ballooning effect encountered in shallow formations in deep water area.
- Shallow formation in deep water area,
- Ballooning effect,
- Formation characteristics,
- Drilling fluid property,
- Mud loss and flowback

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References(20)

References

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