The Critical Role of Wireline Pressure Control Equipment - Gulf Well

Wireline pressure control equipment plays a critical role in well-intervention operations. Well intervention refers to the activities that are carried out on an oil or gas well after it has been drilled, in order to increase production, perform maintenance or repairs, or to evaluate the well’s performance. Some of the specific roles of wireline pressure control equipment in Well intervention include:

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Pressure Containment: During well intervention operations, wireline pressure control equipment is used to contain the Well pressure and prevent any uncontrolled release of fluids or gases from the well. This is accomplished by using pressure control equipment such as wireline valves, lubricators, and stuffing boxes. Here are some ways that wireline pressure control equipment can help in pressure containment during well intervention operations:

a. Wireline Valve: A wireline valve is a pressure control device that is installed at the top of the wellhead. It is designed to allow the wireline cable to pass through it while also providing a pressure barrier to contain the wellbore pressure. Wireline valves are typically rated for high pressures and are designed to withstand the harsh operating conditions encountered during wireline operations.

b. Lubricator: A lubricator is a pressure vessel that is connected to the wireline valve and provides a secondary barrier for pressure containment. The lubricator is filled with a lubricant such as grease or oil, which helps to seal the wireline and prevent well fluids from escaping. The lubricator also provides a safe and controlled environment for the wireline tools to operate in.

c. Stuffing Box: A stuffing box is a pressure control device that is installed between the lubricator and the wireline cable. It is designed to provide a pressure barrier while allowing the wireline cable to move freely in and out of the lubricator. The stuffing box contains packing material that is compressed around the wireline cable to prevent fluid or gas from escaping

d. Pressure Control Head: A pressure control head is a device that is installed above the wellhead and provides additional pressure containment during well intervention operations. It contains a series of valves and fittings that allow for fluid injection or pressure control if needed.

Tool Deployment: Wireline pressure control equipment is also used to deploy wireline tools into the wellbore. These tools may include logging tools, perforating guns, or setting tools for plugs or packers. The pressure control equipment ensures that the tools can be safely and accurately deployed into the wellbore. Besides wireline valves, lubricators, and stuffing box one of the key equipments is running tools. Running tools are connected to the wireline cable and are used to run the wireline tools into the wellbore. Running tools may include setting tools, perforating guns, or other wireline tools that are necessary for the specific well intervention operation.

Well Control: If a well control event occurs during well intervention operations, wireline pressure control equipment can be used to regain control of the well. This may involve using wireline valves to shut off the flow of fluids into the wellbore or to inject fluids to control the well pressure.

Equipment Protection: Wireline pressure control equipment also helps to protect wireline tools and other intervention equipment from damage during deployment and retrieval from the wellbore. Besides lubricator, stuffing box, pressure control head one of the key tools is blow-out preventers (BOP). BOP is a is a critical piece of pressure control equipment that is typically used during more complex well intervention operations. It is designed to prevent the uncontrolled flow of well fluids or gas by sealing off the wellbore. The BOP provides a final barrier of protection for the wireline tools and other equipment used during the intervention operation.

Hunting’s commitment to developing technologies to improve safety and productivity in pressure control operations led to the development and launch of its Ezi-Latch product, Fig. 1. Designed to streamline the connection of the pressure control tool string to the wellhead, using hydraulics, Ezi-Latch eliminates the need for human intervention during the connection process, thereby minimizing the risk of injury. This innovative solution enhances rigging efficiency, making rig-up and rig-down processes quicker, safer and more streamlined.

While Hunting was not the first to market hydraulic wellhead connectors, our deliberate approach allowed us to gain valuable insights from customers and further enhance an already viable solution. By collaborating closely with key stakeholders, Hunting was able to fine-tune Ezi-Latch to address specific pain points and industry challenges. The advantages of the latch lie in its potential to improve safety and productivity in pressure control operations. By automating the connection of pressure control equipment (PCE) to the wellhead during fracturing procedures, the technology effectively minimizes the risk of injury and expedites the process, resulting in increased operational efficiency and cost-savings, Fig. 2.

Well intervention product line. The Ezi-range, and its design philosophy, is one mirrored with other Ezi-branded equipment with the Hunting Well Intervention product line and is synonymous with innovation that enhances operational efficiency and safety. Its inaugural product, the Ezi-Load stuffing box marked a significant turning point in stuffing box technology and pressure control equipment, Fig. 3. Unlike its predecessors, the new-style stuffing box introduced a novel feature: top-loading capability. This innovation eliminated the need for cumbersome disassembly during rigging up and down, streamlining operations and reducing NPT.

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Building on this momentum, Hunting expanded to include the Ezi-Catch in , a complementary addition to the Hunting Tool Catcher. The true innovation, however, came in the form of the Ezi-combo—an integration of the Ezi-Load stuffing box and Ezi-Catch—creating a seamless and comprehensive solution for pressure control operations. This integration not only highlighted the product line’s commitment to innovation but also showcased its dedication to delivering tangible value to the market. 

Hunting Well Intervention, a division of Hunting Energy Services, continued to uphold the Ezi criteria—robustness, efficiency and ease of operation—in their ongoing product development. Notably, they elevated wireline valve technology by introducing Ezi-Close cylinders. These cylinders introduced a pressure-balanced system that enabled manual closure against well pressure, with the added capability to rapidly close under accumulated pressure, vastly reducing closure time. A game-changing addition, this innovation exemplified Hunting's focus on practical solutions that address industry challenges head-on. 

In , Hunting introduced the Ezi-Shear seal valve, which offers a compact and reliable "shear and seal" mechanism for slickline and wireline tubing. Beyond its operational benefits, the Ezi-Shear seal valve addressed critical aspects of operational safety, reliability and well integrity. The industry had a new standard for emergency wellbore isolation, further solidifying Hunting's reputation as an industry leader in innovative technology. 

Inverted Ezi-Latch. The inverted latch system uses the same hydraulics and latching mechanism as the original Ezi-Latch, with the removal of the night cap arm, Fig. 4. Connecting the system to the PCE string instead of the wellhead means less equipment is required to operate a multi pad well, Table 1. The simplicity of the design, developed from our existing Ezi-Catch tool catcher, makes rigging up and down quicker, safer and easier for operators. The failsafe design features three hydraulic cylinders that are remotely actuated to set a lock ring securing the Ezi-Latch connection and lock it in position. Once locked in place, it provides a pressure-tight barrier to begin operations, controlled via a stand-alone hydraulic control panel. The unique profile of the lock ring and the use of springs ensures the lock ring stays in position in the event of hydraulic failure. 

Field trials, success and expansion. The journey of the Ezi-Latch from conceptualization to commercialization was marked by meticulous development and rigorous testing. The engineering teams at Hunting’s facilities in Houston and the UK worked to refine the design, ensuring it met and exceeded industry requirements. To validate its performance and gather real-world feedback, Hunting partnered with two major service companies, conducting comprehensive trials that solidified the Ezi-Latch's efficacy. With its successful commercial launch in early , Ezi-Latch quickly gained traction across oil and gas basins in the U.S. and Canada. Feedback from these regions has been overwhelmingly positive, underscoring the product's transformative impact on pressure control operations.

Furthermore, Hunting expanded the Ezi lineup with complementary offerings, including customized transport frames and the innovative Ezi-Control unit, which represents a significant advancement in hydraulic and grease injection technology. It seamlessly integrates with the Ezi-Latch system and provides comprehensive control over the pressure control tool string, encompassing the greaseless cable pack-off (pressure control head), wireline valve, tool trap and full Ezi-Latch functionality. This all-in-one solution epitomizes Hunting commitment to operational excellence. 

What our clients say. Feedback from major service companies in the U.S. and Canada has been positive, given the partnership during the process. One operator noted that the “simplicity and robustness of the system were some of the attributes that initially piqued our interest.” Operational efficiencies at the heart of the design also mean significant savings on “the cost, both the initial investment and cost to operate.” Ezi-Latches have been in the field for two years, and clients have been impressed with all aspects of the system. Another key advantage of Hunting’s Ezi-Latch, according to a pressure control equipment operations support manager “is the low maintenance, ease of operation, and overall operational effectiveness have kept us at the forefront of the industry.” 

Global footprint. Hunting’s commitment to providing high-quality equipment and superior support extends beyond innovation—it encompasses a global manufacturing footprint strategically positioned near major oil and gas production regions. With flagship manufacturing facilities in Houston, supported by facilities in Houma, La., and Badentory UK, as well as Singapore, Dubai, Saudi Arabia and Norway, Hunting ensures that its solutions are readily available to operators worldwide. As Ezi-Latch continues to gain traction in North America, the potential for further expansion into other regions and offshore applications becomes evident. With offices strategically located in the UK, Norway, MENA and Singapore, Hunting is well-positioned to support inquiries and serve the evolving needs of the global oil and gas industry. 

Emphasis on knowledge management. Beyond the hardware, Hunting places a strong emphasis on knowledge transfer and user training. The seamless transition to operating this equipment is facilitated through comprehensive training and product familiarization. By building a dedicated technical support team, Hunting Group ensures that its clients have the resources and assistance they require to optimize their operations effectively.

CONCLUSION  

Ezi-Latch is an example of how commitment to innovation, safety and operational efficiency can redefine industry standards. Its journey from inception to commercialization is a testament to Hunting’s ability to listen, collaborate and deliver solutions that address difficult challenges faced by the oil and gas sector.   

Lead image: Hunting manufactures equipment and provides services for downhole intervention to optimize operations in producing wells. 

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