Product Part Number:		Product Description:	Tech Sheet Number:
062-0943-001		MWR Sleeve-Valve Cement Retainer, 9.43"OD,  10 3/4" 32.75-60.7#, Wireline Set	062-0943-001
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Operating Instructions			Parts List/Drawing
Features/Description

Features/Description

• Sets securely in any hardness casing, including premium grades
• Ratchet lock ring secures dynamic setting force
• One-piece packing element and flat metal backup rings which combine for superior seal
• Rated to 5,000 psi at 300 Deg F
• Can be simply converted to MMR Cement Retainer
• Case-hardened, one piece slips virtually eliminate premature setting, yet are easily drilled out
• Locked together design and extra clearance safely speeds run-in
• Fin bottom to aid in preventing "Spinning" during drillout
• Can be set directly with Baker Wireline setting tools
• Pressure-balanced sleeve valve is opened and closed from the surface for better control
• Shear studs are Baker style and connect directly to Baker Adjuster Sub
• Crossovers are not required

Many of the outstanding features of our wireline plugs and packers have been incorporated into the Models 'MMR' and 'MWR' Sleeve Valve Cement Retainers. Both are rugged, compact units engineered for fast running downhole on either tubing or electric wireline. Both models feature a positive, pressure-balanced sleeve valve which is opened or closed simply by lowering or raising the tubing. Positively-secured packing element and one piece slips combine to resist premature setting due to well debris or rough handling and assures protection from the hazards of high-speed running in the well. The metal backup rings prevent extrusion of the rubber at high pressure and temperature. Because of their design, the metal-to-metal contact developed by these backup rings is made more secure by pressure increases. An internal ratchet lock ring retains the dynamic force induced in the retainers during the setting operation. This simple mechanism assures continued compression of the packing elements regardless of pressure differentials. Case-hardened, one piece slips, designed to bite into the hardest casing, are located at each end of retainer - final assurance of retainer pack-off security. When the need arises, these slips are easily drilled out.

These Sleeve-Valve Cement Retainers provide a new horizon in dependability, with the economy of all of our tools.

Operating Instructions

The sleeve-valve retainers can be set with Baker wireline pressure setting tools. The setting adapters-contain Baker adapter kits. Kit part numbers are listed in the retainer specification outline.

An adapter rod attached to the setting tool and run through the retainer seal bore attaches to a mild steel release stud located in the shoe at the lower end of the retainer. A setting sleeve attached to the setting tool pushes against the top slip of the retainer. During setting, the sleeve holds the retainer outside components and the rod pulls the retainer central mandrel up; this action sets the slips and packs off the sealing element. The retainer, thus, is set by compression (instead of tension on vital components). At a predetermined tension it releases stud parts and allows the setting tool and adapters to be removed from the well.

To rig the retainer for running, first screw the adjuster sub to the setting tool and make wrench tight. Then, tighten tension mandrel on the adjuster sub. Next,attach the setting sleeve to the setting tool and screw it completely back.

Slide the retainer (and top slip) over the tension mandrel until the tension mandrel bumps the top of the shear stud in the retainer. Thread the tension mandrel to the shear stud by rotating the retainer clockwise (wrench on the valve shoe or shoe of the retainer). Occasionally, due to rough handling, the collet valve will shift downward thus not allowing the tension mandrel to reach the shear stud. Should this happen, first remove the set screw in the valve shoe then unscrew and remove the valve shoe. Push the collet valve fully upward inside the retainer body then re-attach the valve shoe and set screw.

The retainer is run to setting depth in the same manner as a conventional drillable packer or bridge plug. The packer components are shear pinned as a safety measure against premature setting caused by well conditions. Line speed should not exceed 200 feet per minute while running. During setting there may be at least one "kicks" shown on the weight indicator. The kick will indicate the shear stud parting. After setting the retainer, pick up the setting tool a few feet then set back down and tag the retainer to assure the retainer is in place.

The MSS Stinger Seal Assembly is used for sealing into, cementing thru and closing the slide valve on a MWR Cement Retainer when approximately 3,000 to 5,000 pounds of set down weight is landed on the Cement Retainer.

Two inches of upward workstring movement at the Cement Retainer will close the slide valve for fluid containment above or below the Cement Retainer and will allow tubing testing. Two inches of downward movement at the Cement Retainer will open the slide valve and allow fluid to be pumped through the Cement Retainer. Approximately 5,000 to 10,000 pounds tension at the Cement Retainer is required to snap-out. Each time the seal assembly is snapped out, the snap-out force is reduced. The snap-out force will stablize at about 5,000 pounds.Snap in force will stablize at about 2,500 pounds. The stinger seal assembly can also be released from Cement Retainer by pulling 1,000 pound tension over string weight at the tool and rotating 8 to 10 turns to right.

Hydraulic Forces Acting On MWR Cement Retainer

Force created by applied press to the casing and tubing act upon the stinger sub and tubing during cementing and pressure testing opreations. These force are variable and are affected by the area of the cement retainer seal bore, casing and tubing pressure changes at the Cement Retainer,tubing sze and weight and fluid weight.An increase in casing pressure at the cement retainer tends to lift tubing which cansause the slide valve to close. The force generated by a casing pressure increase is calculated by multiplying the csing pressure increase by outside area of the tubing minus the seal bore area of the tool.

A pressure increase in the tubing exerts a listing force at the top of the string which will reduce the effective hook load. A pressure increase in the tubing at the Cement Retainer will tend to hold the stinger sub in the tool and keep the slide valve open. The net of these two forces is upward and is equal to the increase in tubing pressure multiplied by the area of seal bore in cement retainer. When this force is equal to the tubing weight, any additional pressure will lift the tubing and allow the slide valve to close. Therefore, the minimum setting depth will depend on applied pressure changeds in the tubing and casing acting to lift the avaliable tubing weight.

The amount of tubing and annulus pressure that can be applied are limited for any size and length of tubing. When total of the forces is equal to the weight of the tubing in fluid, an increase in either tubing or casing pressure will raise the tubing and close the slide valve. Howeverm the cementing pressure may be increased if the casing pressure is decrease and vice versa. The sanp latch feature of the stinger sub has no effect on either opening or closing the slide valve. The stinger sub will remain in the cement retainer as long as the snap-out force is not exceeded. If excess tension is pulled on tubing while pressure testing the snap-out force may be overcome and stinger sub will be pumped out.

How To Use The Area Pressure Chart:

The values given in the following chart are shown asarea in square inches affected by pressuer cahnge and the direction of resulting force. A positive area and a pressure increase will creat a force tending to keep the slide valve open. A negative area and a pressure increase will tend to keep the slide valve closed. When the net force is negative (-), addtional set-down weight must be applied to keep the slide valve open.

1.Multiply the Change un tubing pressure at the cement retainer by column 1,4 or 6, whichever is applicable.

2.multiply the change in casing pressure at the ceent retainer by column 2,5, or 7, whichever is applicable.

IF the result of these two force is tending to close the slide valve (a negative figure), addtional set-down weight is required to overcome the new upward force.

3.Multiply the tubing gage pressure by column 3. Thsi area is always negative and tending to closing the slide vave by li1fing the tubing at the surface.

If by adding all three forces the result is a negative force tending to close the slide valve and is great than the total hook load of the tubing, the tubing will raise and the slide valve will close . Since the hook load is the limited factor, high pressure at shallow depths may not be possible.

Suggested Drilling Technique for Sleeve Valve Retainers

The following is a general guide for the most successful drill out technique

Spudding the work string and variations in bit speed and bit weight should be made to help break up debris to re-establish penetration should it cease while drilling.

One or more junk baskets should be used above the bit when normal circulation is to be used.If reverse circulation is planned,the casing scraper or other equipment in the tubing string should have an inside fluid passage as large as the passage through the bit so cuttings will not bridge.

NOTE: Drilling times are directly related to tool size, bit stability, drilling weight, pump rate, bit RPM, type of bit, drillong fluid, etc. The same considerations should be used when drilling Cement Retainers as would be used when drilling medium hard formations.