Who is DrawWorks?
DrawWorks designs, manufactures and sells circulating, fill-up and flow-back tools and systems for oilfield tubulars, including casing, tubing and drill pipe. The company was founded in 2000 by Gus Mullins, an engineer with 40 years of experience with Schlumberger Well Testing and Baker Oil Tools and Gus Mullins & Associates. While in his previous positions, Mullins designed drilling, completion and surface equipment and also became highly knowledgeable in casing-to-tubing sealing technology, valve design, and the corrosion and erosion aspects of the drilling and completion environment. Armed with this knowledge and aware of both the strengths and weaknesses of existing circulating, fill-up and flow-back tools, Mullins determined to improve the offerings in this area by designing and selling products that are either superior to that offered by others such as the AutoFill and AutoValve or entirely new to the industry such as the DPC and all are simple to maintain and operate.

What does the DPC™ Drill Pipe Circulating and Flow-Back Tool do?
The DPC provides a fast way to make a pressure tight connection to the work string, tubing or drill pipe at the surface.

What is the DPC used for?
The DPC will allow you to make a pressure-tight connection to your work string in only a few seconds (normally less than 5). You can then circulate or take fluid from the word string. The tool has been used to run liners using fill-up float equipment, fill up the work string while running, circulate to condition the hole while tripping in and out of the hole, and pump out of the hole.

How much faster can I circulate by using the DPC as compared to making a top drive connection or using the kelly or a circulating sub?
To make a pressure-tight connection with the DPC requires as little as 5 seconds for the stab-in type and 10 seconds for the screw-in type.

What are the rig requirements for using this tool?
For most rotary rigs a bail length of 12 ft is all that is needed. For top drive rigs 8 ft is required between the bottom of the saver sub and the top of the coupling in the elevators.

What is the pressure rating of the DPC?
The stab-in type is rated at 5,000 psi for the 3-1/2” and 4-1/2” versions. The screw-in type is rated at the hose pressure rating.

What is the safety valve version of the DPC and what is its pressure rating?
The safety valve version is the screw-in type DPC with a safety valve connected to the lower end. The safety valve is actually screwed into the work string and can be closed to allow the DPC to be removed; this will allow the safety valve to be used for well control at the rating of the safety valve. The pressure rating of the safety valve is determined by the manufacturer.

Can the safety valve be run in the well?
The safety valve is used only on the screw-in type DPC and yes, once the DPC has been disconnected from the safety valve, the safety valve can be used per the manufacturer’s recommendations.

Whose Safety Valve can be run with the screw in type DPC?
We have worked with and highly recommend M&M International’ valve.

What does the AutoFill™ Casing Fill-Up and Circulating System do?
The AutoFill system is used to fill up, take flow back and or circulate casing as it is being run.

Why is your system better than others?
A great deal of effort has gone into the design of our equipment to prevent damage to the customer’s casing, thread or metal-to-metal seal surface. We have also developed a superior mudsaver valve (the AutoValve™) that is a full-opening/positive closure ball valve as opposed to pressure-operated valves that erode during use. Contact us for more details.

What are the rig requirements the AutoFill system?
There are no special requirements when the system is used on a rotary rig, although we do suggest that you use at least 12-ft bails. When using a top drive rig, you may need longer-than-12-ft bails, depending on the space available between the bottom of the saver sub and the top of the casing string or elevators.

Do you provide hoses to connect to the mud system for the rotary ring unit?
Yes, we can provide hoses and a manifold if required.

What does the AutoValve Mudsaver Valve do?
The AutoValve mud saver valve is used as part of the AutoFill Casing Fill-Up and Circulating System to prevent mud from escaping when the valve is removed from the casing.

How does the AutoValve differ from other mud saver valves?
The AutoValve is the only full-opening, straight-through-bore mudsaver valve that eliminates erosion of the valve components during operation and prevents the mud from dripping out of the valve when it is removed from the casing string.

Will the AutoValve damage casing threads?
No, the AutoValve has a nose, guide ring and actuator arm that are specifically designed to prevent contact with and/or damage to casing threads.

Can the AutoValve take flowback (returns)?
Yes, once inserted in the casing the AutoValve is fully opened and mud can flow in or out of the AutoValve. The AutoFill seal should also be stabbed in the casing when taking flowback.

What does your SJC™ Single Joint Compensator do?
The SJC is used with a single joint elevator to balance a joint or stand of pipe while stabbing or removing it during tripping.

How does the SJC differ from other systems?
The SJC is a pneumatically operated system with a long, balanced stroke that reduces the possibility of damage to threads when stabbing or removing a stand or joint of pipe.

How do you balance the pipe?
Once the SJC operating pressure is set, no more is required of the crew.

What are the rig requirements for using the SJC?
A minimum of 80 psi of rig air is required.

What is the capacity of the SJC?
The SJC capacity is from 200 to 8,000 lbs.

Do you provide the control panel?
Yes there is a special control panel that has been designed to operate both the SJC and the DPC Drill Pipe Circulating and Flow-Back system.

Do you provide slings?
Yes, we have slings for handling tubing, drill pipe or casing elevators.