Sliding Sleeve Packer
The Sliding Sleeve Packer (SSP) is designed for use in wells that are subject to extreme temperatures and pressures. Wells that use steam to assist in heavy oil recovery are subject to thermal expansion and contraction on various casing and tubing strings within the well bore. The use of elastomeric elements often fails under these conditions. The SSP uses no elastomeric elements. The SSP design uses Stainless Steel elements that will not wash, wear, or corrode, and have higher longevity. The SSP is designed to seal to the inside diameter of the casing it is set in. Mechanical rotation is required to expand the sealing elements to the casing diameter. Left Hand rotations of the drill or tubing string at surface will expand the seals. Right Hand rotation will decrease the seal diameter and disconnect the seal from the casing wall. The SSP assembly is equipped with a Drag Block, which will allow rotation within the SSP tool to set the seals. All rotational, compressive, and tensile strengths, as well as drift diameters of the SSP, are designed to API standards.
To operate and set the SSP, place it within the well bore at the desired depth. Left Hand rotation will start to expand the stainless steel seals until they come in contact with the inside diameter of the casing that it resides in. Reciprocation of the string will slide the SSP within the casing. The exact drag of the SSP seals against the casing inside diameter is achieved by either adjusting the RH turns to decrease the drag, or adjusting the LH turns to increase the drag. Once the required drag is achieved, the SSP can be repositioned to the desired depth. When multiple SSPs are run in a single well for zonal isolation, the shear pin assembly of the SSPs will be used. Only rotation of the string in either direction will engage the Drag Block. The Drag Block assembly will release as soon as any upward or downward movement is applied to the string. Having the ability to set the drag load of the SSP seals from surface, allows the operator to make future changes to the SSP seal drag, without having to remove the tubing string from the well bore. Proper setting of the seal drag can eliminate buckling or parting of tubing strings due to thermal movements. To remove the SSP string from the well (or multiple SSPs), simply rotate the sting to the right until torque is indicated. This places the seals of the SSP back to original drift diameter and can be removed from the well.