As an independent oilfield service company, NIOT is committed to providing the most secure, safe, and optimal solutions of any company in the industry.
NIOT is the owner and operator of a fleet of accommodation work barges (AWBs) supporting the oil and gas industry.
AWBs are employed to support the following operations, engaging in all stages of the oil field lifecycle:
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Exploration support including
Seismic Surveys
Offshore Hook Up & Commissioning
Platform Construction Support
and Decommissioning
Well testing operation
Offshore lifting operation
Offshore Maintenance
Offshore Accommodation
Safety Statement
From skilled labor and repairs to equipment operation and trucking services, we offer a full range of services to ensure projects are on track and production levels maintained.
Services by Barge
Multi-purpose Support Work Barges are
designed with flexibility and versatility
in mind. They are capable of performin
a range of activities including supply
duties, lifting operations, ROV and survey
activities, platform and platform maintenance,
diving, light well intervention and accommodation
support. To ensure flexibility Work Barges may feature: a anchoring system, heli-deck, cranes, a large open deck area, tank capacity for liquids, large accommodation and walk to work gangway systems.
In such operations, a mooring Barge is usually employed. The Barge moors and stops at a distance of about 300 meters from the platform with the help of the mooring ship, which will take between 12 to 48 hours, depending on the number of anchors, Barge’s dimensions, and weather conditions. Then the barge connects the hose, as well as the pipes and fittings required for the above operations when necessary. At the time of operation, multipurpose barge facilities are being used for operation support.
Mooring barges are usually of high stability and low maneuverability, depending on their types and styles of anchoring systems, and can be moored in a stationary position in rough weather conditions. Besides, to maintain their position, they utilize the power of cable instead of thruster power, which reduces the cost of fuel.
Coherent industry definitions for downhole applications relevant to well intervention are not readily available. Industry definitions as they exist today focus on the well construction and completion phase, and differ vastly based on major oil service providers' definition which is based on their packaged product service lines. To comprehend the scope of well intervention applications, 12 major categories are identified in downhole applications. These categories are well logging, perforating, well cleaning, fishing, fluid displacement, thru-tubing sand control, remedial cementing, selective stimulation, thru-tubing completions, artificial lift services, re-entry drilling, and surface controlled subsurface safety valve repair.
Coherent industry definitions for downhole applications relevant to well intervention are not readily available. Industry definitions as they exist today focus on the well construction and completion phase, and differ vastly based on major oil service providers' definition which is based on their packaged product service lines. To comprehend the scope of well intervention applications, 12 major categories are identified in downhole applications. These categories are well logging, perforating, well cleaning, fishing, fluid displacement, thru-tubing sand control, remedial cementing, selective stimulation, thru-tubing completions, artificial lift services, re-entry drilling, and surface controlled subsurface safety valve repair.
A single downhole application or multiple applications may be required to fully correct a well problem. Pulling of the production tubing is considered to be a major workover of a well requiring a conventional workover rig, and therefore is not included in the above applications. The following services will be done by barge:
➢ Well Testing Service
➢ Acidizing and chemical pumping Sercvice
➢ Well Control Service
➢ High Rate Burner Boom Service
➢ Pumping service
➢ Coiled Tubing (CT) Servic
➢ Electrical Wireline Logging
➢ Slick Line Service
➢ Well investigation Service (down hole camera) ➢ Well Control Service
➢ High Rate Burner Boom Service
➢ Accommodation: 150 people
➢ Offshore Lifting Service
➢ Offshore Platform Maintenance Service
➢ Acidizing and chemical pumping Sercvice
➢ Well Control Service
➢ High Rate Burner Boom Service
➢ Pumping service
➢ Coiled Tubing (CT) Servic
➢ Electrical Wireline Logging
➢ Slick Line Service
➢ Well investigation Service (down hole camera) ➢ Well Control Service
➢ High Rate Burner Boom Service
➢ Accommodation: 150 people
➢ Offshore Lifting Service
➢ Offshore Platform Maintenance Service
The frequency of well intervention that will be performed during the life of a field is difficult to predict, since the decision to intervene in a well is dependent on numerous variables, including reservoir characteristics, infrastructure and economic considerations. Stimulation and remedial cementing/conformance
applications are the most frequent reasons for well intervention. It is interesting to note that well intervention is most often performed to address reservoir specific issues, rather than to repair downhole mechanical equipment and completions.
applications are the most frequent reasons for well intervention. It is interesting to note that well intervention is most often performed to address reservoir specific issues, rather than to repair downhole mechanical equipment and completions.
1. OFFSHORE WELL TESTING AND CLEAN-UP
To perform the operation, when the barge approaches the platform, well-testing pipes from the wellhead (Xmas Tree) will be connected to the berth. Typically, based on the capacity and dimensions of the platform, some parts of the well testing equipment, such as automatic and safety valves, may also be located on the platform. Then, a flexible high-pressure hose provides a connection between the barge and the platform, and conveys oil and gas from the wellhead to the devices mounted on the barge, such as a multiphase separator and will be burned through fixed burner boom on platform or on the barge. Afterwards, water and oil may be stored in barge tanks considering the environmental issues.
2. ACIDIZING SERVICE
Well Stimulation is carried out to increase production by improving the movement of hydrocarbons into the well bore. In addition, drilling and completion fluids sometimes damage the formation by blocking the pores in the reservoir, thus preventing flow of hydrocarbons to the well. Matrix acidization and hydraulic fracturing are two main types of well stimulation.
Matrix acidization is a process of injecting acid and chemicals into the wellbore, penetrating the formation pores at pressures below fracture pressure. The key benefit of it is it brings back the original permeability of the reservoir rock. During pumping, acids break up the deposits and / or any solid particles within the pores that prevent hydrocarbons to freely flow towards the wellbore. It also removes any damage around the wellbore, that in turn increases productivity.
Placement of acid in the reservoir is of very high importance. There are number of tools and techniques available to achieve the right balance of pumping rate and acid placement. Application of such tools and techniques may vary from field to field. Placing fractures in the right place in deviated and horizontal wellbores with non-mechanical isolation tools is key. Generally, a jetting tool deployed on the coiled tubing, is used in order to place the acid in the right spot in the reservoir, which is more efficient that pumping from the surface.
A specialized vessel is required to conduct well stimulation offshore. Coupled with challenges in offshore application, 24hr operation and technical requirements, offshore well stimulation becomes a very well planned and thought-over process. There are a number of constraints that should be considered and planed in advance, such as vessel tanks and storage capacity, manning capacity to accommodate the required crew, pumping capacity and sailing time to refill the supply.
In general, well stimulation offshore requires larger pumping volumes than onshore. On some occasions, when a long horizontal well requires stimulation, 2 or 3 vessels might be required to provide continuous pumping operation without any interruption. In addition, blending rates, horse power and gearbox of the pumps on board the vessel play one of the vital roles in providing uninterrupted pumping.
3. WELL LOGGING, SLICKLINE, AND WIRELINE CONVEYED PERFORATION
Hydraulic fracturing is a process of pumping water, sand and chemicals underground, to have enough pressure to break the rock. It is mainly used in formations that have lower ability to transit fluids (aka permeability).
In well intervention, downhole applications are performed in the wellbore to remedy production problems or otherwise increase production from the well. Most of these applications are typically a less complex version of well construction and completion phase work.
A wireline operation involves running and pulling tools and equipment into and out of the well by the use of a continuous-length, small-diameter solid or braided wire mounted on a powered reel at the surface. This can be done on a
wellbore that is still under pressure. Typical wireline operations include perforating, logging, cleaning wells, and dumping cement. Most wireline surface equipment units are self-contained skids that consist of the wireline reel, power supply and associated control and connection equipment.
4. COILED TUBING
A CT operation involves inserting a continuous and a flexible steel pipe into a well bore to convey various well servicing tools and to circulate fluids. Steel coiled tubing is made from strips of high-strength steel that are rolled and seam welded. The tubing is flexible enough to be coiled onto a reel, with diameters that range from 3/4 to 3-1/2 in. Higher wall thicknesses and the development of new alloys have increased the strength of coiled tubing to allow it to withstand extreme pressure loadings and have improved its resistance to stress corrosion cracking. Advances are also being made in the area of light-weight composite coiled tubing.
CT surface equipment units are self-contained hydraulically powered workover units that provide substantial time and cost savings when compared to using a conventional workover rig. The major advantages that CT offers include:
Faster running speeds into and out of a well since the operator does not have to stop to connect or disconnect each joint of pipe
Reduced rig up and trip times
Ability to continually circulate fluid through the pipe while the tubing is being lowered into and out of the hole
Localized delivery of downhole fluids, increasing production tubing life and preventing contamination of acid from tubing scale
Ability to work on live wells
Ability to perform many wireline services can be performed in highly deviated and horizontal well bores by installing an E-Line inside coiled tubing.
This method is suitable for smaller platforms with less structural strength and space, but it requires a calm weather (wave heights less than 4 ft.).
This method is suitable for smaller platforms with less structural strength and space, but it requires a calm weather (wave heights less than 4 ft.).
5. HYDRAULIC WORKOVER
An HWO uses hydraulic cylinders to push jointed sections of pipe into the well, in contrast to the continuous tube used in CT. The pipe can be inserted either under pressure or after killing the well.
The advantages of using HWO over CT are that HWO can handle more complex jobs involving deeper reservoirs with higher pressures. HWO has the ability to use tapered pipe and can adjust the pipe length based on reservoir depth. HWO operations however are more costly than that of CT operations. The decision to use HWO instead of CT is dependant on the requirements of the specific application to be performed and the overall economical consideration. There are three basic categories:
➢ High pressure snubbing refers to pushing pipe into a well under pressure. This is an area where HWO competes with CT to perform work on live wells
➢Hydraulic rig assist units assist conventional workover rigs and supplement the work performed by rigs to make the intervention job much more economical. By definition a rig assist unit is not a stand-alone type unit and operates only in conjunction with the workover rig
➢Hydraulic rig assist units assist conventional workover rigs and supplement the work performed by rigs to make the intervention job much more economical. By definition a rig assist unit is not a stand-alone type unit and operates only in conjunction with the workover rig
➢ HWO units have the ability to perform a major workover on the well, and compete directly with the work that is traditionally performed by conventional workover rigs. Major workover jobs typically involve the pulling of the production tubing for repairs.
NIOT maintains high safety standards, working to secure sites, personnel, and the environment. However, ensuring safety is not something left to chance. We make sure everyone working with us is trained and pays careful attention to standards and policies set by the company.
Qualified Services
