Each tool introduction
1. Automatic filling valve
Automatic filling valve is an automatic balance valve. There are two roles. The first is when the coil tubing goes in, automatically balance the internal and outer level of the string and its pressure. Prevent the tubing from being out.
When need to setting the bridge plug, throw the ball and suppress to setting the bridge plug.
2. Bridge plug access tool
The bridge plug access tool is specially designed for the laying down the bridge plug. The access tool varies according to the structure of the bridge plug. Access tool of through tubing adopts detent engagement, fixed down the well. The dropped bridge plug joint can facilitate the salvage of the bridge plug!
After the plug is setting, the release pin into the tool will bear the internal pressure of the string. When the design pressure is reached, the pin is cut, the piston moves down, and the bridge plug is released, wellhead pressure decreases.
When the bridge plug needs to be recovered, use the GS salvage tool to directly salvage the salvage neck of the plug. Salvage out of the bridge plug.
3. "GS" overshot
The "GS" overshot is the standard fishing tool. Selection is based on the shape and size of the fishing neck.
Drop down directly and engage with the fishing neck. The bridge plug can be pulled above. (If it's an unsealed bridge plug )。
If the existing string cannot pulled out the bridge plug after engagement, must remove the GS overshot. Take out the fishing string.
"GS" is a refundable fishing tool.
4. Introduction of the expanding bridge plug
The through tubing expanding bridge plug is a hydraulic expansion filling sealing packer assembly. There are permanent bridge plug and recyclable type.
The recyclable bridge plug is divided into direct bridge plug and indirect bridge plug.
Direct unsealed bridge plug due to the pressure on the lower part of the plug, the design of the pin force must be consider the differential pressure under the plug. To avoid the top force unsealed the bridge plug;
The indirect release of the plug so that the force on the plug does not act on the shear pin.
Ensure the sealing and work of the bridge plug. When unsealing is required, lift the joint above, The pin will be stressed.
The internal balance valve ensures that the bridge plug is unsealed first balance, to ensure that the internal and external pressure difference is consistent. Unseal again.
The lower puller can protect the bridge plug from the friction of the outer diameter damage when go into the large slope well
5. The introduction of the continuous oil pipe pouring ash tube
Coil tubing ash pouring pot is a tool used to match the coil tubing through the tubing bridge plug. After the bridge plug is settling, it is often needed pour ash to increase the pressure capacity of the bridge plug. Ensure the smooth operation of the lower part. There are two ways to open the ash cylinder, one is the switch when the pressure, one is the switch. It can also be turned on by action.
After opening, the direct pressure pushes all the cement out of the inverted ash cylinder. Operating steps:
1. Conduct exhaust pressure test on the rubber cylinder of the bridge plug in the workshop before entering the well. Cover the steel pipe with 4-10mm greater than the rubber drum. After the exhaust, press down by 2-5 Mpa. (Do not remove the rubber cartridge again)
2. Connect the bridge plug and supporting tools into a string, go into the wellbore, and slowly when reaching the target layer
3. Confirm the depth of insertion - Throwing the ball
4. Suppress setting bridge plug.
5. The sealing pressure of the bridge plug continues to press up. Shear pressure of the delivery tool to reach the bridge plug
6. After cutting the tool, the bridge plug is sealed. Delivery tool and bridge plug removal. The pressure on the ground is instantly released to zero. Remove the plug and send it into the string
