northstar logo

Open Hole: Bottom Hole Compression

Rotating Control Head

The Full Bore Rotating Control Head is a compact high pressure, Surface Test Tree with an integrated swivel. With 4 valves, the rotating control head provides a primary flow control barrier via the master valve and secondary barriers from the kill, flow and swab valves. The integral swivel allows the drill string to rotate freely from above (top drive) or below (rotary table) while the kill and flow lines remain stationary.

Pump Out Sub

The Pump Out Sub is used to circulate fluid from the drill string after the drill stem test has been completed, and the drill string is ready to be removed.

Pump Out Sub

The Pump Out Sub is used to circulate fluid from the drill string after the drill stem test has been completed, and the drill string is ready to be removed.

Gauge Carrier - Northstar DST

The Gauge Carrier holds up to four or eight electronic memory pressure and temperature gauges depending on the model.

Shut In Valve

The Shut-In Valve is rotation activated for up to two down-hole flow and shut-in periods. It is typically run in conjunction with the Hydraulic Valve during bottom-hole compression DST’s. It operates by shifting a sleeve in order to line up the flow passages and also features a bearing for activation while in compression to maintain weight on the Packers.

hydraulic valve

The Hydraulic Valve is a down-hole valve used in opening and closing the flow from the test zone. The tool gives positive surface indications of opening: a sudden, small movement of the drill pipe, combined with a slight reduction in drill pipe weight.

Extension Joint

The Extension Joint is used to allow free travel of the work-string. This allows operators to get a good indication of hole drag in deviated holes. The Extension Joint also allows free pipe movement before the Hydraulic Valve is operated.

Squeeze Tool

The Squeeze Tool is a check valve that opens to balance tubing to annular pressure when the tubing pressure exceeds annular pressure. This prevents supercharging of the formation in the interval while setting packers or opening the down hole hydraulic valve.

Sampler

The Sampler catches a sample of produced fluid and retains the sample at the down hole pressure of the interval at the instant that the hydraulic valve is closed. The valves of the Sampler are opened and closed by the movement of a mandrel extending from the hydraulic valve.

Hydraulic Jar

The Hydraulic Jar is used in the event that equipment becomes stuck in the well bore and provides an upward shock to assist in freeing the tools. Over-pull at surface is applied to the string, which causes oil to move through a flow restrictor.

Tension Safety Joint

The Tension Safety Joint is a two-stage emergency disconnect tool that can be used to mechanically separate the drill string in a controlled way. If the string is stuck at a packer or elsewhere, it can be operated to recover tools above the Safety Joint. The lower half of the safety joint that is left down hole provides a connection for fishing tools.

convention packer

The Conventional Packer contains a telescoping mechanism to compress rubber elements against the formation when weight is applied.

convention packer

The Conventional Packer contains a telescoping mechanism to compress rubber elements against the formation when weight is applied.

Gauge Carrier - Northstar DST

The Gauge Carrier holds up to four or eight electronic memory pressure and temperature gauges depending on the model.

Bottom Hole Compression or Conventional drill stem tests use compression-set packers set above the formation, with tail pipe (drill collars or hevi-wate drill pipe) below the packers to the bottom of the hole. Placing weight on the tool string compresses the packers creating a seal before hydraulic valve opens, allowing the formation to flow.

The formation is flowed for a specified time period, after which the drill pipe is rotated five turns to the right to close the shut-in tool for a specified shut-in period (build-up). Five more right-hand rotations opens the shut-in tool for a second flow. Five more rotations (total 15) closes the shut-in tool for a final build-up. The tubing/drill pipe contents can be reversed out of the string though the pump-out-sub before pulling up on the drill pipe to close the Downhole Sampler and release the compression packers.

Benefits

Deliverables

Specifications

Rotating Control Head

The Full Bore Rotating Control Head is a compact high pressure, Surface Test Tree with an integrated swivel. With 4 valves, the rotating control head provides a primary flow control barrier via the master valve and secondary barriers from the kill, flow and swab valves. The integral swivel allows the drill string to rotate freely from above (top drive) or below (rotary table) while the kill and flow lines remain stationary.

Pump Out Sub

The Pump Out Sub is used to circulate fluid from the drill string after the drill stem test has been completed, and the drill string is ready to be removed.

Pump Out Sub

The Pump Out Sub is used to circulate fluid from the drill string after the drill stem test has been completed, and the drill string is ready to be removed.

Gauge Carrier - Northstar DST

The Gauge Carrier holds up to four or eight electronic memory pressure and temperature gauges depending on the model.

Shut In Valve

The Shut-In Valve is rotation activated for up to two down-hole flow and shut-in periods. It is typically run in conjunction with the Hydraulic Valve during bottom-hole compression DST’s. It operates by shifting a sleeve in order to line up the flow passages and also features a bearing for activation while in compression to maintain weight on the Packers.

hydraulic valve

The Hydraulic Valve is a down-hole valve used in opening and closing the flow from the test zone. The tool gives positive surface indications of opening: a sudden, small movement of the drill pipe, combined with a slight reduction in drill pipe weight.

dh sampler

The Sampler catches a sample of produced fluid and retains the sample at the down hole pressure of the interval at the instant that the hydraulic valve is closed. The valves of the Sampler are opened and closed by the movement of a mandrel extending from the hydraulic valve.

Squeeze Tool

The Squeeze Tool is a check valve that opens to balance tubing to annular pressure when the tubing pressure exceeds annular pressure. This prevents supercharging of the formation in the interval while setting packers or opening the down hole hydraulic valve.

Extension Joint

The Extension Joint is used to allow free travel of the work-string. This allows operators to get a good indication of hole drag in deviated holes. The Extension Joint also allows free pipe movement before the Hydraulic Valve is operated.

Hydraulic Jar

The Hydraulic Jar is used in the event that equipment becomes stuck in the well bore and provides an upward shock to assist in freeing the tools. Over-pull at surface is applied to the string, which causes oil to move through a flow restrictor.

Tension Safety Joint

The Tension Safety Joint is a two-stage emergency disconnect tool that can be used to mechanically separate the drill string in a controlled way. If the string is stuck at a packer or elsewhere, it can be operated to recover tools above the Safety Joint. The lower half of the safety joint that is left down hole provides a connection for fishing tools.

convention packer

The Conventional Packer contains a telescoping mechanism to compress rubber elements against the formation when weight is applied.

convention packer

The Conventional Packer contains a telescoping mechanism to compress rubber elements against the formation when weight is applied.

Gauge Carrier - Northstar DST

The Gauge Carrier holds up to four or eight electronic memory pressure and temperature gauges depending on the model.

convention packer

The Conventional Packer contains a telescoping mechanism to compress rubber elements against the formation when weight is applied.

Related Case Studies

Request a Quote: Open Hole: Bottom Hole Compression

Please fill out the form below and we will get back to you as soon as possible.