Drilling fluid backflow system for offshore drilling without marine riser
A drilling fluid and riser technology, used in wellbore/well components, earthmoving, wellbore flushing, etc., can solve problems affecting wellbore stability, limitation of pumping capacity, and inability to pump drilling fluid back to the drillship And other issues
A drilling fluid and riser technology, used in wellbore/well components, earthmoving, wellbore flushing, etc., can solve problems affecting wellbore stability, limitation of pumping capacity, and inability to pump drilling fluid back to the drillship And other issues
CN112922548APending Publication Date: 2021-06-08派格水下技术(广州)有限公司
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[0071] The present disclosure provides an offshore riserless drilling fluid return system for offshore drilling operations that can return drilling fluid from a wellbore to a drilling platform without using a conventional offshore platform riser. The offshore riserless drilling drilling fluid return system described in this disclosure is not limited by the size of the drilling ship or the water depth capability when performing drilling operations, so relatively small floating drilling platforms (such as drilling ships or other Offshore drilling equipment), greatly improving the economic benefits. The drilling fluid return system for offshore riserless drilling of the present disclosure can be applied to deepwater drilling or ultra-deepwater drilling of underwater substrates or sedimentary formations.
[0072] The drilling fluid return system for offshore riser-free drilling provided by the present disclosure includes: a drilling fluid volume control unit, an open water drillin...
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The invention provides a drilling fluid backflow system for offshore drilling without a marine riser. The drilling fluid backflow system comprises a drilling fluid volume control unit, an open water area drilling rod, a drilling fluid backflow pipeline, a drilling fluid backflow pump installed on the drilling fluid backflow pipeline and a drilling fluid processing device; the drilling fluid volume control unit is directly installed on a well head or above a blowout preventer without the marine riser, and the top of the drilling fluid volume control unit is open towards seawater; the drilling rod extends from a drilling platform through the volume control unit and performs a drilling operation passing through the interior of the volume control unit; the drilling fluid backflow pipeline is connected with the volume control unit through a hose, the drilling fluid backflow pump is sequentially installed on a pipe section in the backflow pipeline in the axial direction and used for pumping drilling fluid flowing into the backflow pipeline from the volume control unit to back to the drilling platform, and the drilling fluid is recycled after being treated by the drilling fluid processing device. The drilling fluid backflow system is not limited by the size and the water depth of a drilling ship, capable of effectively recovering the drilling fluid, and suitable for full-water-depth drilling operation.
Description
technical field [0001] The disclosure belongs to the technical field of offshore energy exploitation, and relates to a drilling fluid return system for offshore riser-free drilling. Background technique [0002] Drilling operations in the sea can realize the development and utilization of seabed energy, and can carry out the exploitation of energy such as oil, natural gas and combustible ice. In order to realize deepwater drilling and ultra-deep drilling, riserless drilling technology can be used in deepwater drilling operations. However, for ultra-deep water drilling operations, the existing large-scale drilling equipment uses large-diameter risers, which need to be installed with high-pressure well control pipelines, and the installation is done underwater, which cannot guarantee the safety of the installation, and at the same time, the cost is high. [0003] Specifically, the main function of the large-diameter riser is to realize the return flow of drilling fluid and th...
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Patent Timeline
08 Jun 2021
Publication
CN112922548A
- IPC
- E21B21/08; E21B21/10
- CPC
- E21B21/08; E21B21/10
- Inventors
- 斯迈·格莱迪奇