| Citation: |
Qiu-ping Lu, Yan-jiang Yu, Xie Wen-wei, Jin-qiang Liang, Jing-an Lu, Ben-chong Xu, Hao-xian Shi, Hao-yu Yu, Ru-lei Qin, Xing-chen Li, Bin Li, 2023. Design and feasibility analysis of a new completion monitoring technical scheme for natural gas hydrate production tests, China Geology, 6, 466-475. doi: 10.31035/cg2022045
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Design and feasibility analysis of a new completion monitoring technical scheme for natural gas hydrate production tests
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Abstract
As a prerequisite and a guarantee for safe and efficient natural gas hydrates (NGHs) exploitation, it is imperative to effectively determine the mechanical properties of NGHs reservoirs and clarify the law of the change in the mechanical properties with the dissociation of NGHs during NGHs production tests by depressurization. Based on the development of Japan’s two offshore NGHs production tests in vertical wells, this study innovatively proposed a new subsea communication technology—accurate directional connection using a wet-mate connector. This helps to overcome the technical barrier to the communication between the upper and lower completion of offshore wells. Using this new communication technology, this study explored and designed a mechanical monitoring scheme for lower completion (sand screens). This scheme can be used to monitor the tensile stress and radial compressive stress of sand screens caused by NGHs reservoirs in real time, thus promoting the technical development for the rapid assessment and real-time feedback of the in-situ mechanical response of NGHs reservoirs during offshore NGHs production tests by depressurization.
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References
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Qiu-ping Lu, Yan-jiang Yu, Xie Wen-wei, Jin-qiang Liang, Jing-an Lu, Ben-chong Xu, Hao-xian Shi, Hao-yu Yu, Ru-lei Qin, Xing-chen Li, Bin Li, 2023. Design and feasibility analysis of a new completion monitoring technical scheme for natural gas hydrate production tests, China Geology, 6, 466-475. doi: 10.31035/cg2022045
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Figure 1.
Possible geomechanical issues induced by NGHs dissociation (modified from MH21，2019).
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Figure 2.
The downhole system for the first test (left) and second test (right) in Japan (modified from MH21, 2019; Matsuzawa M et al., 2014; Zhang W et al., 2017).
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Figure 3.
Emergency disconnection and re-connection test of a subsea test tree onshore.
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Figure 4.
A wet-mate connector used for the emergency disconnection and re-connection of subsea test trees.
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Figure 5.
Coupling device consisting of a guiding shoe and a directional sub.
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Figure 6.
Directional insertion-based communication device of upper completion.
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Figure 7.
Schematic diagram showing the design of the new monitoring technology for well completion of NGHs production tests. Upper completion: 1–Y-tool electric submersible pump for artificial lift; 2–expansion nipple; 3–single-acting mechanism; 4–centralizer; 5–protective front end of a wet-mate connector; 6–body of guiding shoe; 7–spiral angular surface. Lower completion: (1)–positioning pin of sand screen; (2)–packer of sand screens. Communication system and pressure testing mechanism of well completion: a–communication cable of upper completion; b–wet-mate connector (upper half); c–wet-mate connector (lower half); d–communication cable of lower completion; e–electrical cable for pressure and temperature gauges; f–DTS cable; g–piston-type pressure sensor; h–piston-type pressure measuring mechanism; i–communication cable for lower completion monitoring; j–radial pressure measuring mechanism.
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Figure 8.
3D interference analysis of the communication connection between upper and lower completion through directional insertion.
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Figure 9.
Certificated patent of the new communication connection between upper and lower completion.