A Drilling Stem Test (DST) is a pivotal procedure in the oil and gas industry, conducted during the drilling of a well. It involves the deployment of specialized downhole tools, including a packer and control valve, to isolate and evaluate a specific geological formation’s reservoir properties. By monitoring pressure, flow rates, and fluid composition, DSTs provide crucial insights into the formation’s potential productivity, permeability, and fluid properties. This data guides decisions on well completion, reservoir viability, and production strategies, ultimately playing a vital role in optimizing the economic success of oil and gas wells.
Gulfwell provides various DST equipment including
Bar Drop Reverse Circulating Sub (BDRCS): During a DST, this specialized downhole tool can be employed to facilitate reverse circulation of fluids and debris from the formation being tested. By redirecting the flow of fluids up the drill string and through the annulus, the BDRCS helps remove any debris or contaminants that may have accumulated at the bottom of the wellbore. This process is essential for ensuring accurate and representative reservoir data during DSTs, as well as for maintaining the integrity of the wellbore and drilling fluid.
Over Pressure Kill Reverse Valve: This valve is designed to control the flow of fluids and gases during DSTs, especially in scenarios where the formation’s pressure exceeds the hydrostatic pressure exerted by the drilling mud. When activated, the Over Pressure Kill Reverse Valve helps maintain wellbore integrity and prevents formation fluids from flowing uncontrollably into the wellbore, which could lead to well control issues.
Hydraulic Shut-in Tool: This tool provides the capability to shut in the wellbore quickly and effectively during DST operations. It is designed to remotely close a valve or other downhole components, allowing operators to control the flow of fluids from the formation being tested. This control is essential for monitoring pressure buildup and reservoir behavior, ensuring the safety of the well, and preventing any uncontrolled flow of hydrocarbons.
Bottom Hole Sampler: This specialized tool is designed to collect representative fluid samples from the reservoir at the bottom of the wellbore. By providing accurate and reliable data, the Bottom Hole Sampler plays a pivotal role in making informed decisions regarding wellbore completion, production strategies, and reservoir characteristics during DST operations
Recorder Carrier: It serves as a housing or platform for various downhole instruments and sensors, including pressure gauges and other data recording devices. The Recorder Carrier is designed to withstand harsh downhole conditions and protect sensitive instruments while they collect critical data during DST operations.
Squeeze Relief Sub: This specialized tool is designed to provide a means of relieving excess pressure that may build up during a DST operation. If the formation pressure exceeds the design limits of the DST tools or presents a potential risk to wellbore integrity, the Squeeze Relief Sub can be activated to divert or release fluids and pressure safely.
TD Hydraulic Jars: These specialized hydraulic jars play a crucial role in the well completion and testing process by providing a means to release and separate the drill string when it becomes stuck or encounters excessive resistance downhole. When activated, TD Hydraulic Jars exert a powerful hydraulic force to help dislodge the stuck portion of the drill string, allowing for its retrieval and preventing costly equipment loss.
Downhole Inflatable Pump: This specialized tool is used to remove wellbore fluids and debris from the formation being tested during a DST operation. By inflating a packer element, the Downhole Inflatable Pump creates a sealed and isolated zone in the wellbore, allowing for the efficient removal of fluids from the formation.
Upper Inflatable Packer: This specialized tool is designed to create a sealed and isolated zone within the wellbore, typically above the formation of interest, during a DST operation. By inflating the packer element, it effectively isolates the upper section of the well from the lower part, ensuring that only the targeted formation is tested.
Bottom Inflatable Packer: This specialized tool is designed to create a sealed and isolated zone within the wellbore, typically at the bottom, around the formation being tested. By inflating the packer element, it ensures that only the specific reservoir zone is subjected to testing, preventing unwanted fluid ingress or egress from surrounding formations.
Interval Spacing with Bypass Pipe: This tool is employed to selectively isolate specific intervals or zones within the wellbore during DST operations. By incorporating a bypass pipe, it allows operators to test multiple reservoir zones individually and gather data from various sections of the wellbore without having to retrieve the entire DST string.
Drag Spring: This specialized tool serves as a downhole shock absorber, helping to mitigate the impact of sudden jarring or shocks that can occur during various well operations, including DST testing. By absorbing and dampening these forces, the Drag Spring helps protect downhole tools, instruments, and sensitive components, ensuring their integrity and reliability throughout the DST operation.
Perforated Anchor: This specialized tool combines two important functions: anchoring the DST string in place within the wellbore and creating perforations in the casing or liner to allow for fluid flow from the formation being tested. By securing the DST equipment and facilitating the controlled flow of reservoir fluids, the Perforated Anchor ensures the successful execution of DST operations.
Wireline Re-Entry Guide: This specialized tool is designed to guide and support wireline tools as they re-enter the wellbore during DST operations. It plays a pivotal role in ensuring the safe and precise re-entry of wireline instruments and tools into the well, allowing for the collection of additional data or the execution of various downhole tasks.
To know more about Gulfwell’s product portfolio for DST please write to sales@gulfwell.ae