annual report, page-98

"In Casey's last OB about May though, he referred to having solved the technical difficulty in the field, and went on to talk about care needed not to break the SHAFT driving the submersible at such a depths!

There's either a new method of powering submersibles that I'm not aware of OR he's not au fai with his OWN operation, because the beauty of submersibles is - you attached the pump to the tail pipe, lowering it gently into the shaft or well head, keep adding lengths to the tail pipe as needed, and of course the attached sealed electric cable accompanies said equipment down the hole to the required depth."

Hi Lilac,

I have never heard of a submersible pump having a shaft (I believe you are referring to what it is called a pump rod), attached to it, as you have mentioned in regard to Casey's talks. So, I tend to agree with you that maybe Casey he is not au fai, or maybe, a little confused about it.
I do also agree with your comments about centrifugal pumps, but again they are of a totally different catte of fish. As you say, unless they are of the self priming type/definition, they always need to be primed to be fully functional. And to be self priming at such depths, I have never heard of it before. Besides, the lifts that they are capable and designed of doing to maintain the priming stage in order to continue pumping, IMHO they are totally not suitable, nor capable, of doing what is required here.

There are also jet pumps that are capable of lifting water form a great depth. And they work by simply pumping water from a pump set at surface down a pipeline, in order to create a pressure at the bottom that would lift and push water further afield. But again these types of pumps, do not require pump rods either. Nor, do I believe that they are available in the market to operate at such depths. And it appears that they have now been superseeded by submersible pumps due to the fact that they are more efficient and less energy consuming that what they are. I did replace one of them myself with a submersible one because of the power consumption.

As for the sumbersible pumps, they do work in the way you have described. And that is that you will lower the pump, which is attached to a delivery pipe and the electrical cable and an ancor/lifting stainless steel cable, down to the bottom of the well. Most importantly though,there is no need for any pump rods that have been mentioned previoulsy by Casey and the Board.

Hence why, when there were some talks about the possibilities of using a submersible pump instead and, knowing from my past experience what would have been involved with it, I did make some enquiries as to the availabilities of them and the cost involved. As such, quite sometime ago, I posted what I received as advise from the specialist people involved in this Industry.

None of the above has been posted by me searching the net in regard to it, but it is just based on my own personal knowledge and experience.

Regards.