We recently performed two jumper fabrication metrologies for an operator in Congo, off the coast of West Africa using our subsea precise inertial navigation system (C-PINS). We worked with a great ROV crew to transport C-PINS between manifolds and permanent guide bases (PGB) at a depth of 1600m. The data collected allowed our surveyors to precisely measure the distance between these seabed structures as well as the heading, pitch and roll of the structures. We also collected precise differences in depth between the installations. The operator will utilize this information to construct two jumpers in an onshore fabrication yard. Once fabricated the jumpers will be transported offshore and lowered in place connecting the manifold to the PGB’s.
The data from the two metrologies was collected within the client’s specified tolerances and we had the deliverable submitted to the client within 12 hours. We were able to save the operator a significant amount of vessel time and money by using C-PINS to complete these metrologies. This technique is much faster than the industry standard time, ultimately increasing productivity and efficiency for the client. With over 200 metrology surveys completed to date, Zupt and C-PINS continue to provide the deliverables for jumper fabrication within the tightest deadlines and to the highest quality.
Choose Zupt for efficient, optimal metrology surveys.
We’ve recently discovered that we have a microbrewery right around the corner from our office. On Thursday nights they have sampling, so being the good neighbor we are – we decided to host ZUPT HAPPY HOURS!
The weather is cold but a beer is always good! Join us this Thursday, February 22th, 2018 at 11 Below for a good atmosphere, great drinks and even better conversation.
If you’re in the Houston area and would like to join us for a beer, please drop us an email at firstname.lastname@example.org – we will then send you a Zupt coupon that gets you free beer tokens for the evening. We are not sure what they will have on tap – but it is an excuse for a beer and a chat. Local food trucks rotate through if you get hungry!
11 Below is located at 6820 Bourgeois Rd, Houston, TX 77066
No matter where and when you enjoy a beer – please drink responsibly. We will arrange a ride for you if you decide you should not drive.
The Zupt Team
In a joint effort, Zupt and Harkand carried out the first deep water diver based inertial metrology in Mexico’s waters at a record-setting 380 fsw in the Bay of Campeche. The completed survey project was in support of the installation of an expansion spool piece for a new pipeline and platform campaign.
The efficiency of Zupt’s inertial solution, combined with the skill and expertise of Harkand’s personnel, allowed the client to have results within 12 hours and fabricate the expansion spool piece in two days.
To read the full article on how Harkand’s divers completed this work with Zupt’s inertial system, please visit Subsea World News.
Due to the unpredictable nature surrounding offshore survey operations (think: low visibility, ROV failures, vessel changes), it is imperative that operators can count on survey solutions to work, and to work every time. Emerging technologies such as LiDAR are appropriate for some applications, but they also have inherent shortcomings that impose major financial risks on operators. Zupt’s inertial solution provides reliable, accurate, and efficient metrology operations, with quick delivery turnaround.
Visibility – Reliability:
LiDAR surveys are extremely vulnerable to the effects of high turbidity and low visibility. In the event that visibility goes south after the survey crew has been mobilized and vessel time committed, operators risk losing hundreds of thousands of dollars waiting to collect metrology survey data. Zupt’s C-PINS is always able to deliver metrology results even in the most extreme low visibility situations, without any loss of accuracy.
Laser surveys deliver hub attitude data based on a one-sided, sparse, point cloud data set that is then “cylinder fit” onto a very small vertical cylinder (highlighted in below image). It is still uncertain what quality metrics are used to support the data that is delivered by subsea LiDAR for hub attitude. Zupt delivers metrology surveys with attitude specification of as little as 0.5° (2 sigma). We are able to prove our accuracy (often less than 0.1°) with known quality metrics. If the connectors need precise hub pitch, roll and heading data, inertial is the optimal solution.
Mobilizing LiDAR equipment onto the ROV requires splicing into the fiber can of the ROV which will easily take 6 hours with the ROV on deck. Often, due to operational or ROV issues, we have to move from one ROV on board to another at short notice. C-PINS is up, running and the ROV is in the water within 30 minutes. This will not be the case if you need to break into the fiber bottle on the second vehicle. What if you need the metrology team to move to the rig to complete the survey? In many cases rig ROV support personnel will not have the skills needed to interface survey equipment through the fiber channels on the ROV.
Once data collection is complete, the LiDAR data set (as much as 200MB) has to be sent ashore and a substantial amount of time is necessary to process the data into a deliverable. Metrology isometrics are on the critical path to first oil. Zupt’s skilled offshore survey teams make the delivery offshore within 12-24 hours of recovering the ROV after data collection.
With nearly 140 metrology surveys to date, Zupt and C-PINS continue to provide the deliverables for jumper fabrication within the tightest deadlines and to the highest quality.
Choose Zupt for efficient, optimal metrology surveys.