冲破瓶颈－贝克休斯带来超高温/高压专用封隔器

Previously, when downhole temperatures and pressures rise above 177 C (350 F) and 12,500 psi (862 bar), even HP/HT-rated elastomers and slips could permanently set inside the casing wall. When this occurred, the result was at least one day of unplanned milling and fishing time at a cost of $1-plus million in deepwater wells, in addition to increased HSE exposure.

Simply upgrading a conventional removable packer with HP/HT materials is not sufficient to ensure packer removal in HP/HT conditions. The BASTILLE chassis has been engineered specifically to separate from the casing wall when released, even after prolonged expo- sure to temperatures up to 204 C (400 F) and differential pressures as high as 17,500 psi (1,207 bar), an industry first at these ratings.

When intervention is needed, a mechanical pipe cutter is run in hole and aligned below the bottom slips. It makes a cut to sever the inner mandrel while the outer packer wall stays intact. When the production tubing is pulled uphole the mandrel follows. This action releases the bottom slips and relaxes the elastomer. As pulling continues, the upward pressure shears pins that let specially designed segments break free. The packer wall flexes inward, and the upper slips pull free from the casing wall, reducing friction and letting the packer break free from the casing. On its way uphole shoulders on the mandrel catch the outer packer wall, and the entire assembly is retrieved with the production tubing. The BASTILLE packer extends the efficiency of removable production packers to HP/ HT wells. Baker Hughes also offers the SCION removable production packer for use in wells with standard (non-HP/HT) conditions.

One-trip setting is accomplished by pressuring up against a plugging device below the packer after it has been run to depth. The BASTILLE packer can be threaded directly onto the production string, or it can be connected with an anchor seal assembly so the production tubing can be removed without having to release the packer. Either way, it provides a gas-tight, reliable seal in HP/HT conditions while offering the flexibility to remove the packer later as needed for workovers and recompletion operations.

Unlike permanent production packers that require drillout runs—leading to increased costs, HSE risks, and potential for damaged casing—the BASTILLE packer features a cut-to-release design that makes it possible to remove the packer with a chemical cutting tool, or mechanically with the Baker Hughes Mechanical Pipe CutterTM (MPCTM) tool deployed on coiled tubing.

Applications

• Multizone completions
• Deepwater and ultradeepwater wells
• HP/HT environments with temperatures up to 400°F and pressures up to 17,500 psi
  

Features and Benefits

• ISO 14310 V0-rated

1. Ensures gas-tight sealing in harsh environments
2. Helps maintain wellbore integrity

• Cut-to-release modular design

1. Locks the packer into the casing until it is cut
2. Enables one-trip retrieval
3. Requires no body movement while setting, enhancing reliability
4. Supports single- and multiple-packer completions

• Reengineered packer construction

1. Inner collet relaxes the energy of the packing element when cut to aid retrieval
2. Specially designed segments retract to allow the packer wall to contract and free the slips from the casing wall
3. Full disengagement enables the packer to move freely in the casing, easing retrieval

The BASTILLE removable production packer stays removable… Even in HP/HT conditions. That means:

• No milling
• No fishing
• No waiting
• No casing damage