Today, well logging means anything having recorded data with the drilling and the depth of the well at the same time, most of the times represented by a graph and related notes. Logging tools are entered into the well to calculate the electrical, radioactive, acoustic, and electromagnetic properties of the subsurface formulations.
Sometimes the logging devices are applied into the drilling device, and sometimes the drilling devices are lowered into the well at proper intervals to gather data.
Drillers and engineers use the well logs to measure thickness and depths of formations, porosity, temperature, water saturation, types of formations collected, presence of gas or oil, reservoir pressures, estimated permeability, and formation dip — finally determining if a well is commercially feasible or not and whether or not casing, completion, and cementing should be run on a well.
It’s not only a review of what is perforated beneath the surface, but also an anticipation of success.
As part of the well interposition, reservoir information and well conditions are needed to assess options for further conclusions. Data acquiring (well logging and case-hole logging) is a procedure of obtaining subsurface data.
Speaking of well logs, they can be geological, whereby illustration of rocks is attained or geophysical logs, attained using unique tools lowered into a well. Geophysical logs, also known as wire-line logs, can be cased hole and open-hole. Open-hole logging is useful during authentic well drilling operations, whereas cased-hole logging is a segment of the well illustration domain.
Cased-hole logging attains measurements with the help of casing in the well and gives data about the well and reservoir, as well as a perception of wells’ behaviors and conditions.
Speaking of production log testing, it usually includes monitoring of corrosion, cement conditions, and fluid formation contacts. It is also helpful in determining the situation of plugs, perforating, and packers mounting. Bottom-hole studies give temperature and pressure reports, when needed.
Here are the quintessential tools that are utilized for cased-hole logs:
- Noise logging
- Radioactive tracer logging
- Temperature logging
- Fluid capacitance logging
- Gamma-ray density logging
- Electromagnetic imaging
- Multi-frequency measurements
- Memory production logging
Some Additives Should Be Taken Into Considerations
Evaluate the necessity of chief and back up equipment, as it can cost more. Having multiple rigs working in the region, back-up equipment may be distributed amongst them, if needed.
Course of prices from one constructer to another, especially when wire-line logging units are positioned and need installation work that may lead to extravagant standby costs for a drilling offshore and wire-line units. Consider a lesser charge in the costing mechanism to provide more visibility to service providers.
Effective category separation methodology to apparently divide two parts, high-tier, and low-tier, will permit to maintain the leverage position, assure access to the newest technology and skills, and improved local participation.
To make sure a more competitive environment and raised the participation of domestic companies in the low-tier subcategory.
Build long-term relationships with distributors in the high-tier subcategory to handle technical and wells’ challenges, and assure drilling objectives are met in the most competitive way.
Overall, spend for both categories into a higher package, when leveraging on supplier skills is a must, or integration with other services is crucial. Buy vs. Rent could be a choice when a large usage of the lower-tier segment is predicted. Equipment could be purchased from major manufacturers with prolongation agreements with the scheduled local service supplier to be in place.
Growing suppliers in lower-tier part might lead to remarkable local value generation. Additionally, over time, this will finish the way for the conversion of local suppliers to a high-tier part.
Growth of authorized local service providers for tools and equipment maintenance when operators purchase logging devices.
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