This photo shows a wiper mandrel with 3”, 4”, and 5” wiper elements. One generic hard parts design works for all the different pipe sizes in use. This way one tool can be dressed to operate in any elements for whatever the job calls for. It also keeps transportation costs and time lost to a minimum.
The MUD DOG can be dressed to work in tubing (from 2”), drill pipe (all sizes), and casing (up to 13 3/8”). The MUD DOG can be modified to work in tapered strings without having to change the configuration of the tool- such as 5 ½” down to 3 ½” drillstring or 6 5/8” to 5 7/8” string. We welcome all inquiries for custom applications!
The life expectancy of wiper elements is approximately 180,000 linear feet, depending upon the internal condition of drillpipe in use. Tapered string elements have a slightly shorter life expectancy, due to rigorous element movement in smaller pipe dimensions.
A spare parts kit is available for the MUD DOG wiper tool being utilized in remote locations and is usually included with international job orders. Detailed instructions are included in the kit.
A spare parts kit is available for the MUD DOG wiper tool being utilized in remote locations and is usually included with international job orders. Detailed instructions are included in the kit.
Drift disc attachments are manufactured to the customer’s requirements. This attachment allows the operator to check drift in the drillpipe while wiping the interior during pulling out-of-hole operations. Under normal circumstances a disc will be created to whatever size the job requires and shipped within 24 hours.
This photo demonstrates a drift disc mounted on a wiper and ready to run. No special tools are required to install the drift disc on our MUD DOG wiper.
Our MUD DOG MAX is for larger pipe diameters and is used for casing and cleaning the pipe as it comes out from the hole. The casing wiper is usually a special application tool and is tailored for each specific customer need. We offer units that will operate in casing sizes from 4” to 13 3/8” in diameter and we welcome inquiries for any special application that our customers require. The MUD DOG MAX will operate in any drilling or completion fluid available in today’s oil and gas industry. Since it is normally used in an “open-ended” pipe situation, the MUD DOG MAX has its own size specific overshot to remove the wiper when needed. Tapered string design is not an issue for the MUD DOG MAX and in most instances cleans several diameters without having to change the tool configurations. This photo shows the casing wiper float chamber (with centralizers) and the casing wiper mandrel assembly (in the box).
The Pee Wee Overshot is available for use with the MUD DOG wiper if retrieving the tool from the drillstring is required. The Pee Wee Overshot has a low impact retention spring to “fish” the wiper off the surface of the fluid- as compared to other company styled overshot products that require a hard impact to set the retention dogs on the tool. When time is of the essence, use of the Pee Wee Overshot decreases the odds of damaging the wiper while allowing for a more immediate retrieval operation.
Refer to Figure 1
- The wiper is shipped assembled and ready to use. It consists of two parts, the float-chamber unit and the wiper-assembly.
- THIS UNIT SHOULD BE HANDLED CAREFULLY. Handle the unit by holding the float chamber portion.
- WHEN SOME ASSEMBLY IS REQUIRED:
- Remove the lock washer retainer from the end of the wiper mandrel and make-up the unit as shown in Figure 1.
- Tighten by hand until the lock washer is fully collapsed between the mandrel and float chamber.
- Use only an eight (8) inch crescent wrench to tighten the jam nuts on the unit.
- WHEN SOME REPAIRS ARE NECESSARY:
- When shipped, the vent stud and Go-No-Go shock absorber from the base of the float chamber are assembled, tight, and require no attention.
- IF it becomes necessary to remove the vent stud and the Go-No-Go shock absorber from the base of the float chamber for repairs, a 15/16” thin wall socket is required. When taking the unit apart, be sure to note just how it was put together so you can put it back together without problems. TOOL WILL FUNCTION WITHOUT GO-NO-GO INSTALLED. See: Paragraph E, Item 4.
- If necessary to remove wiper mandrel assembly from the float chamber, unscrew the flex joint (see Figure 1) at the float chamber. USE CAUTION when re-assembling the unit to be sure the lock washer is in place.
- USING THE WIPER
- If the pre-trip slug is successful, lower the wiper in the drillpipe, FLOAT FIRST, and pull pipe out of the hole
- The wiping function is limited only by the diameter of special tools and drill collar bore in the bottom hold assembly if less than specified in Chart A.
- If conditions require pumping tool to bottom, the annual area between the wiper tool barrel and the 2 13/16” bore collars will permit circulation of 400 GPM without pressure increase.
- PRESSURE EQUALIZING VENT IN FLOAT CHAMBER MUST BE FUNCTIONAL TO PREVENT COLLAPSE OF TUBE IF SUBJECTED TO PUMP AND HYDROSTATIC PRESSURE (Sheer plug installed in vent stud BEFORE delivery of tool).
- CAUTIONS AND WARNINGS
- WARNING: Do not drop tool in a drillpipe. LOWER the tool into the pipe until wiper element is inside tool joint and release.
- DO NOT RUN TOOL IF FLOAT CHAMBER IS BENT OR DAMAGED. The tool may then hang-up in the collars.
- DO NOT recommend Diesel oil or water be added to drill pipe after lowering wiper; it will serve no useful purpose.
- RECOMMENDED PROCEDURE FOR DOPING PIPE: Dope pipe when going in hole. The tool may sink if doping is done when coming out of hole. Excess high specific gravity drillpipe dope will accumulate on wiper elements and will cause the tool to sink and become useless.
- TO REPLACE WIPER ELEMENTS
- Remove the overshot spear, spacers, and wiper elements then replace the wiper elements. Reference Figure 1 for assembly order.
- Replace all spacers and parts in exactly the same order as you removed them. Tighten firmly with hands, only. DO NOT USE A PIPE WRENCH
- Tighten all lock nuts and threaded connections with an 8 inch crescent wrench, only. Make parts snug. Do not over tighten.
- WIPER ELEMENTS ARE COMPATIBLE WITH OIL BASE MUDS, SYBTHETIC BASE MUDS & TOXIC WORK OVER & WELL COMPLETION FLUIDS
- STORAGE OF WIPER TOOL
- Store wiper tool out of sun, standing vertical
- TO FISH TOOL
- Low impact grapple overshot is necessary to fish the wiper due to flotation. Use the Pee Wee Overshot available through Haggard ID Wiper. Overshot may be centralized to line up with OS spear.
- WIPER FLOAT CHAMBER AND MANDREL ASSEMBLY
- One unit fitted with proper element size works for all pipe sizes. Tool type 13/4” OD x 12’ long. Minimum required fluid weight= 7.7 #/gal.
- WIPER MANDREL ASSEMBLY
- The same wiper mandrel assembly fits all wiper element sizes.