Check if the hydraulic power packs have long flexible hoses to the hydraulic motors. If they have then beware - the constant flexing "Breeds" tiny broken - off particles of rubber which can play hell with filters and valves. Stainless steel piping much preferred.
Alex

As Alex mentioned, it will be advisable to get a proper inspector to do the inspection. It is worth the money unless you are picking up a rig just for a short well project. 

A Rig Rat like me can only do a test on Mud Pumps, BOP etc, but those inspectors can check a lot of other things such as output of the generator, thickness of the piping and other misc stuff which we frequently overlook but could cause potential down time if fails. 

Definately incorporate a professional process integrity collaboration process.  Machine Learning and Block Chain technology now allows for the Acquired Intelligence of the '70's to be commingled with the Artificial Intelligence of the '90's so there can be Augmented Intelligence during the project coordination process.  Key is perceiving all HESQ process hazards and then with the team in place allocate the contracts and costings when the plan is completed.  No tendering and decision around costs. 

Endorse Alex Millers comments.

i remember we drilled 6 wells with five different rigs. We had a team of people addressing  all rig intake issues that always included Integrated rig inspection specialists. 

Bitter experience from Norway would make me advise you to get a recognised expert company to look at this such as Kingston or ADC etc. Hydraulic assurance is not for the normal drillers but needs thorough expert evaluation.  Also get them to check the drawings and spares inventory making sure those companies still exist.
 This is from a man who had 30% NPT due to poor hydraulics.

Hi There,

I would say that New Purchase Rig inspection checklist for land rigs (one for hydraulic rig would be better) must compliance with a safety inspection.
Remember Safety is Number one.

I have OSHA that consisting item to inspect according to related API RP

Best Regards
Benjamin Hidayat
Old Driller Never Die only Fade

Dea Dan, Augusto and Jorrit. Many thanks for your replies and valuable comments.

Hi Pulkit,

You may find the attached of use.

There are loads more checklists out there.
The attached should help you well on your way.

Warm regards, Jorrit

Inspection of Drilling rigs and equipment; types and purposes of rig inspections and how to do them, AMOCo

 

IADC/SPE 23900 Surface BOP inspections, Chevron

 

MODU rig inspection. Rig inspection Leo Nagtegaal

 

WestHOU. Michael Montgomery [Michael@WestEngineer.com]

 

·      Veritas Associates. Drilling unit inspection & management audit services. Paul D Baumgardner

Hello Pulkit,

Here are my suggestions for check list, considering the cost effective criteria.

Total depth

The hole size will give you the drill bit size then the required hydraulic horse power is obtained and finally the mud pump equipment can be selected.

Rule of thumb: Hydraulic horse power = 3-5 hhp/sq. in of bit diameter

Assume 65% of the available surface horsepower when bit horsepower is being maximized

Drill pipe

Bigger the size of the DP the less circulation loses which then has to be balanced against cost and weight.

Casing Program

Potential Hole Problems:

a. Shale sloughing will require more bottom hole cleaning therefore the calculated available surface horsepower must be corrected accordingly (increased)

b. Pipe stuck will require a higher derrick loads therefore the safety factor for derrick loads must be increased

Derrick maximum hook load capacity – under what conditions the ratings are made when comparing them.

If in doubt an API certified inspector should verify all ratings:

- Check if the rating is made for a certain type of crown/travelling-block line configuration or not)

- Check for leg loading, substructure rating, maximum wind loading with drill pipe in the derrick.

Drawworks horse power rating applicability rests primarily on the necessary time to hoist a load rather then actual ability to hoist the load.

The power required to stop a load in free fall can be far greater than the drawworks capacity

Triplex Mud Pumps

- Are much lighter than duplex for the same horsepower rating (e.g. 70 lbs vs. 400 lbs)

- Can operate at higher pressure with fewer fluctuations

Horse power rating is based on input horsepower but when make the selection it is the output horsepower that is relevant (it will give the maximum values for pressure and flowrate).

Also, the contractor must provide the maximum sustained levels at which the pump has run which allows an adequate pump selection and planning the hydraulics program.

Drillpipe

Discuss with the firm that performed the last inspection and if in doubt require an inspection to be run.

Mud system

Tank capacity needed in the active system

The rule of thumb is the total pipe displacement at the projected total depth multiplied by 2.5

Centrifugal pump is the most preferred option for a good mud mixing and stirring.

Select the solid control equipment needed based on the performed analyze.

Auxiliary equipment (e.g. degasser, mixing tanks, chemical barrel, charging pumps, pit level indicator) hast to be inventoried and ask for the absence of equipment, if applicable.

BOP

- Check the ratings not only for the BOP but for lines connections, and valves

- Check the availability for the annular and rotating preventers, choke manifold, accumulator, remote and direct controls, choke and kill lines.

- Make a sketch of BOP system to  ensure the adequacy of the system

Power package

If the required horsepower is greater than 1,000 a diesel electric generator is selected.

Power allocation between rig components is more efficient.

I hope this will help you out.

Dan