Nitrogen injection is used in oil and gas drilling as an effective method to increase well productivity and safety. Due to its inert properties, nitrogen prevents unwanted chemical reactions and fires. By creating pressure in the wells, this gas helps the better flow of oil and gas and is very useful in wells whose natural pressure has decreased. Nitrogen is also used in pressure testing and leak testing of equipment and pipelines, as it minimizes the risk of explosion or fire.
Separation of high pressure layers in wells is done by driving wall pipes and cementing them. Cementing of oil wells involves mixing and transferring the slurry down the wall pipe and rising the same slurry through the annular space behind the wall pipe, which is the result of closing and sticking the wall pipe to the formation.
In order to stimulate the oil and gas producing layers, acid is injected into the well. By injecting acid inside the well, in carbonate formations, a part of the matrix is dissolved by acid and new paths are created for the production of hydrocarbons, and also in sandstone formations, the injected acid opens damaged and blocked passages.
This service includes the use of special hydraulic wrenches to drive and install wall and core pipes. Generally, for each well, up to 5 wall and liner pipes are driven and one completion of the well is performed. Usually, well testing services are performed with core pipe. which is also one of the duties of this department.
Checking and recording all drilling parameters, including well depth, weight on the drill bit, length of BHA and its type, mud and its characteristics - pressure and temperature, the volume of drilling logs at the depth that characterizes wash-outs and is necessary for wall cementing is, the type of log in the depth and the preparation of its diagrams, useful information is obtained. In this information, the tests performed including the cores and geological information are also logged and used for well planning, the type of hydrocarbon and gas output in the mud indicates the yield layer. Therefore, it is one of the drilling services in exploratory wells. It is necessary to define and describe the existence of this service.
CT is a device for continuously inserting the brain tube into the well; which is used for purposes such as pumping and injection, creating circulation, milling, drilling, etc. CT is a fully hydraulic system where the power required for the Injector engines is supplied through a main pump and the power required for other components is provided through sub-pumps.
The conventional diameter range of the brain tube that is most used is between 1-1.75, but the advances made in CT technology allow the use of dimensions of 2 to more than 3.5 for special purposes, such as the field of gas production or the field of completion, drilling. and other similar cases have been provided.
Advantages of mobile brain tube:
Operations and drilling under pressure
Speed of operations
Fluid circulation and operation during operation
Operation in narrow wells and traversing brain tube volume
Operation in areas with limited space and extent
Easy to transport and independent
Compared to the rig with high safety
Drilling operations are generally exposed to the risk of pipe jamming and the creation of fish or residue in the well. Due to the heavy daily cost of the rigs, special measures should be taken immediately after the pipe jamming. Basically, based on the expert opinion of at least 24 Work is done on the residue for up to 48 hours, and if the residue finding charts show failure, it is necessary to find the residue and remove the residue from the well, which can be drill pipes or something else.
The balance tool includes a wide range of accessories from different conversions to Over Shots and special Diu collar-taper tap-spear to Junk Basket and various rods and Magnet, Impression block and other accessories.
Experts in this department must have good experience. Remaining primary equipment or not, including special over shots, are available on the drilling rig, and immediately after cutting the pipe, the remains are found, but the cases that require the creation of a valve or exit from the wall, or the installation of cement and side track, these parts are handled by Other service companies are done.
Downhole testing is used to evaluate the hydrocarbon potential of a formation for temporary well completion
And the following results can be obtained from it:
- Type of tank fluid
- Bottom well pressure in closed and
- flowing state
- The temperature inside the well
- formation production
- Effective penetration
- Damage to the well wall
- Diagnosis of tank anomalies
- radius of investigation