A Wellhead Attitude Monitoring System and Method Suitable for the Whole Process of Deep Water Jet Downpipe

Abstract

The invention provides a system and method suitable for deep-water jet guiding tube tripping-in full-process wellhead posture monitoring and belongs to the field of petroleum drilling. The system comprises a wellhead inclination degree measuring and signal transmission unit, an underwater ROV close-distance signal processing unit, a water surface ROV control monitoring unit and a driller control panel wellhead posture displaying unit. The wellhead inclination degree measuring and signal transmission unit is mounted on a wellhead or a mud mat, obtains wellhead inclination condition data and transmits the wellhead inclination condition data to the underwater ROV close-distance signal processing unit or the water surface ROV control monitoring unit. The underwater ROV close-distance signal processing unit is located under water, receives the wellhead inclination condition data transmitted from the wellhead inclination degree measuring and signal transmission unit and transmits the wellhead inclination condition data to the water surface ROV control monitoring unit.

Description

technical field [0001] The invention belongs to the field of petroleum drilling, and in particular relates to a wellhead attitude monitoring system and method suitable for the whole process of deep water jetting down a conduit. Before pipe cementing, the posture of the wellhead in the water during the process of running into the formation, the posture of the wellhead during the process of jetting into the formation, and the posture of the wellhead at the mudline before surface casing cementing are monitored. Background technique [0002] The potential of global offshore oil and gas resources is huge, and it has become a consensus in the industry that the future and hope of the oil industry lies in the sea. Offshore oil and gas reserves in the deep water and ultra-deep waters of the continental slope are huge. With the advancement of oil exploration technology, major oil giants are making every effort to enter the deep sea. In deep water drilling, jet drilling is generally u...

AI Technical Summary

Problems solved by technology

When the conduit and the wellhead are lowered into the sea without contact with the mud, pass through the splash zone or encounter internal waves, etc., they are only visually inspected by the underwater robot ROV, and there is no accurate monitoring of the wellhead inclination angle. If the wellhead inclination exceeds the standard during this period It is possible to damage the running tool and make subsequent projects impossible; during the injection process, use ROV to observe the wellhead or the bull's eye on the anti-sedimentation pad to determine the inclination angle of the wellhead. During this period, if the inclination angle of the wellhead exceeds the allowable range, it will cause the conduit The pipe string is unstable or the conduit cannot be run smoothly; before surface casing cementing, the weight of the entire conduit and wellhead is borne by the shallow soil layer. At this time, the ROV floats to replace the tool without monitoring the inclination of the wellhead. At this time, the wellhead is tilted due to insufficient bearing capacity of the shallow stratum, which will cause the wellhead to sink below the mud line or the overturning angle is too large to carry out subsequent construction.

[0003] The current technical situation is that before the conduit and the wellhead are lowered into the sea without contact with the mud, the accuracy of the wellhead posture cannot be guaranteed by using ROV; during the injection process, the ROV is used to monitor the posture of the wellhead by observing the bull’s eye

Since the ROV cannot swim directly above the bull’s eye (to prevent ROV cables and other winding pipe strings from being disengaged) to observe the situation of the bull’s eye, it is easy to cause errors in visual readings (such as Picture 1-1 and Figure 1-2 shown), and a large amount of turbid mud came out of the wellhead during the jetting process to block the sight of the bull's eye and make it impossible to read, resulting in the inability to monitor the attitude of the wellhead in a short period of time (such as figure 2 shown); before surface casing cementing, no wellhead posture monitoring is performed at this stage

If the wellhead inclination angle exceeds the standard in these processes, it will cause serious consequences, making it impossible to carry out construction, delaying the construction period, and losing a lot of money

[0004] At present, no related documents or inventions have been found, which involve related systems for monitoring the inclination angle of the wellhead during the whole process of jet drilling

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