A variety of sealing accessories are available for use with Retainer Production Packers. Each is designed to meet the specific requirements of certain completion techniques. To select the proper packer-to-tubing seal system for any well completion, careful consideration must be given to present and future well conditions. Factors which must be considered are:

Seal movement

Maximum pressure differential

Maximum and minimum temperatures

Well Fluids & (H2 S, CO2, or other corrosives and inhibitors)

These environmental considerations will determine the best combination of packer seal accessory type (locator, anchor or other), accessory material (metals), and seal stack (elastomers) for use in each case.

Basic assembly includes two seal stacks. Any number of seal units can be added for increased length. Production tubes, tailpipe or other accessories with OD’s compatible with packer bore can be attached to the bottom of this seal assembly.

The Locator Tubing Seal Assembly is the simplest packer seal system. It is run in the well on the production tubing string until its no-go shoulder "locates" on the top of the packer. This positions one or two seal stacks in the packer’s bore and establishes a seal between the packer and the tubing. The number of seal stacks in the packers is determined by the type of packer being used. Packers with enlarged upper or alternate seal bores use seal nipples with one seal stack. Packers which do not have alternate seal bores will accept seal assemblies with two or more seal stacks.

When a Locator Tubing Seal Assembly is landed on a packer the tubing is normally set in compression to compensate for any contraction of the tubing during treating operations. It is not always possible or desirable to slack off sufficient weight, particularly in deep deviated wells, to compensate for contraction. In such a case, additional length must be added to the packer’s seal bore using seal bore extensions and to the locator tubing seal assembly using a combination of spacer tubes along and additional seal units.

Locator/Anchor Tubing Seal Assemblies & Nipples

MODEL "BG" LOCATOR TUBING SEAL ASSEMBLY WITH SPACER TUBE

This extended Model "BG" Locator Tubing Seal Assembly is furnished with 6 seal stacks. Designed for installations requiring tubing movement, this seal assembly should only be used with packers with seal bore extensions or with retrievable packer bore receptacles. Like all locator tubing seal assemblies, it should be landed with sufficient set-down weight to prevent seal movement. When used in a properly designed system, this seal assembly will give long service life even if movement occurs.

Basic assembly includes two seal stacks. Designed for use in Models "BD" packers. Production tubes, tailpipe or other accessories with OD’s compatible with packer bore can be attached to the bottom of this seal assembly.

An Anchor Tubing Seal Assembly can be used as an alternative to set-down weight to prevent seal movement or when it is desirable to land the tubing in tension. The anchor tubing seal assembly or anchor tubing seal nipple is run on the production tubing string. Set-down weight will cause the anchor’s threaded latch to engage the corresponding threads in the top of the packer. Once engaged, the anchor and tubing are securely locked in place. Any tubing contraction will cause a tensile load to be applied to the tubing string. Care must be taken to ensure tensile forces developed will not part the tubing whenever an anchor is used. To release the anchor it must be rotated to the right 10 to 12 turns at the packer.

Standard Seal Stack - Made up of Nitrile chevron seals and steel spacer rings. Should not be allowed to leave seal bore in service.

V-RYTE Seal Stack - Made up of Viton chevron seals with Teflon and Ryton back-up rings, Ryton front-up rings and steel separators. Should not be allowed to leave seal bore in service. This seal stack is used for hostile well environment with H2s & Co2 at high temperatures.