Oil casing connection problems

In the working process of the screw pump, the rotor rotation will trigger the twisting and vibration of the oil pipe. In addition, the J-groove of the tubing junction is subject to high friction during the extraction process, which is where most of the tubing damage and deterioration problems occur. At the same time, operators have been looking for a “magic tool” that can improve the casing torque rating and reduce costs at the same time. With the DTR tool, casing connection is no longer a problem! DeltaTORQ Rings (DTR) is a new casing connection kit designed specifically for the upstream oil and gas industry to increase the torque load of casing clamps. The DTR makes perfect use of the J-groove in the casing joint, providing excellent sealing performance in addition to increasing the torque rating of the tubing. The use of the DTR tool eliminates the need for other tools and greatly simplifies the screw pump completion operation. At the same time, the tool is perfectly embedded in the J-slot, making the inner surface of the tubing smoother and reducing frictional losses. The DTR is available in various sizes to meet all casing requirements in accordance with API-5CT standards. During field operations, DTRs are installed by specially designed handheld tools and are calibrated after connection, improving efficiency and reliability. In addition, if the field operation time is tight, DTR can also be installed inside the oil casing in advance without affecting its own reliable working performance. It can be said that the DTR tool brought by Volant has greatly reduced the risk of casing docking problems.

Operational Problem 1 When casing or tail pipe rotation is required, casing designed according to standard API torque standards usually cannot meet the operational torque requirements, which is one of the most frequent and persistent problems in the field. Solution: The DTR is designed to make full use of the J-shaped space at the casing joint. The tool has a high cross-sectional area, which can significantly increase the torque carrying capacity of the oil casing junction hoop, thus improving the operating capacity of the entire string.

Operational challenge 2 The rotor of a cavity pump rotates in the opposite direction of the tubing threads, so it is very common for the tubing to back out during cavity pump operation, and if not detected and resolved in time, the tubing will eventually fall off, resulting in costly workovers. Solution: The DTR can be perfectly embedded in the tubing kink, increasing the torque level and greatly reducing the chance of tubing uncoupling, which is of great value in improving stability, reducing the number of well repairs and increasing production revenue.

Operational challenge 3 As the tubing is used more often, the threads become more worn and eventually thread damage (such as penetration) occurs. To solve such problems, operators must cut and regrind the threads, which undoubtedly increases development costs. For this reason, developers have been actively looking for solutions to mitigate thread wear. Solution: DTR can provide long-lasting protection to the tubing knotting hoop, ensuring reasonable torque and keeping the threads in the best connection condition, effectively extending the life of the tubing.

Operational challenge 4
During the production process of oil ring, the oil pipe is often filled with high-speed flowing gas, sand and other substances, which directly accelerates the wear of J-shaped groove at the oil pipe connection (due to the groove, the smoothness is poor) and reduces the service life of the oil pipe. Solution: DTR makes the J-groove embedded in the tubing junction more smooth, effectively reduces friction, protects the junction and extends the service life of tubing. MLT protection ring, specially made for oil casing connection! MLT is designed to meet the API standard and can play a great role in improving the success rate, whether it is a downstream casing operation or a cementing operation that requires rotary operation. With MLT, field work is so easy.

The problem: Tubing The top drive screw pump is driven by a shaft that connects the surface drive to the downhole screw pump, which usually rotates in the opposite direction of the tubing thread connection, which can cause tubing backing problems and necessitate workovers. Solution: Placing the MLT at the tubing kink can improve the thread torque rating, prevent backbolts, and reduce the use of other equipment, which saves money and increases the life of the tubing. In addition, MLT prevents sand from collecting in the kink, which keeps the threads clean and extends the life of the tubing. Operational challenge: tubing threads We know that tubing connections are made very quickly during field operations, sometimes causing problems such as excessive torque and thread damage. As the number of times the tubing is used increases, the threads become more worn, and eventually the threads have to be removed or reground. There was nothing much many developers could do about the problem, but now the situation has changed dramatically because of MLT. The solution: Volant’s MLT protection ring acts on the knotted hoop to provide protection during the thread connection, keeping the thread butt in ideal condition and effectively preventing excessive torque, which has many benefits for extending the life of the tubing threads.

Operational challenge: J-groove of the clamp The high velocity flow of gas in the tubing can wear the J-groove inside the clamp. Solution: MLT fills the J-groove to make the inner part of the clamp smoother, reducing the abrasive effect of the gas and extending the life of the tubing. Operational Challenge: Casing In wells with complex downhole conditions, casing entry operations often rely on rotations and other operations to overcome frictional resistance. The rotation of the casing requires the cooperation of the top drive, CRT and tubing, and the ability of the casing to withstand a large enough torque is the key to the success of the operation. Solution: MLT can improve the tapered shape of the tubing male buckle (which is easily damaged during operation) to a certain extent, and provide protection to the tubing while increasing the rotational torque level of the knotted hoop.

Operational challenge: Casing threads Casing threads are often misbonded during casing butt joints, which reduces the working strength and sealing performance of the casing.