Open Hole: Bottom Hole Compression
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.
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.
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.
The Gauge Carrier holds up to four or eight electronic memory pressure and temperature gauges depending on the model.
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.
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.
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.
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.
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.
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.
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.
The Conventional Packer contains a telescoping mechanism to compress rubber elements against the formation when weight is applied.
The Conventional Packer contains a telescoping mechanism to compress rubber elements against the formation when weight is applied.
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
- Test on penetration while drilling – When oil or gas shows occur while drilling, pull the drilling BHA and run in hole to immediately test the formation with the DST BHA before mud invasion formation damage.
- Trip Dry – Run in hole with dry pipe or air gap to maximize underbalance for inflow testing Deliverables:
Deliverables
- Formation Pressure (P*) and temperature charts for Pressure Transient Analysis (PTA)
- PTA Deliverables: Permeability (k), damage/skin, Deliverability, Flow Regime, Reservoir Boundaries
- Production Rate - Gas and liquid
- Downhole reservoir fluid samples
Specifications
- Packer pressure differential: 5,000 PSI
- Absolute pressure: 8,000 PSI
- Temperature: 140 C / 284 F
- Hole sizes: 6.125” to 12.25”
- Wash-out: 15%
- Deviation: up to 45o
- Interval size: unlimited
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.
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.
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.
The Gauge Carrier holds up to four or eight electronic memory pressure and temperature gauges depending on the model.
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.
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.
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.
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.
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.
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.
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.
The Conventional Packer contains a telescoping mechanism to compress rubber elements against the formation when weight is applied.
The Conventional Packer contains a telescoping mechanism to compress rubber elements against the formation when weight is applied.
The Gauge Carrier holds up to four or eight electronic memory pressure and temperature gauges depending on the model.
The Conventional Packer contains a telescoping mechanism to compress rubber elements against the formation when weight is applied.
Find information on any of our DST services.
Solutions recently used in geothermal
