That looks very much like a secured loan and that there is also a mortgage on the property.
What it is saying is:
"No disposition of the registered estate by the proprietor"
The owner of the property cannot sell it
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"...or by the proprietor of any registered charge, not being a charge registered before the entry of this restriction"
A "registered charge" is something like a mortgage or secured loan. What this is saying is that the house also cannot be sold by anyone else who has a secured loan, or other charge, dated after their secured loan.
But, if there is any charge earlier than their secured loan (eg if there was an already existing mortgage) then that company are allowed to foreclose (or repossess if you prefer) the home regardless. The reason for this is that their security predates that of this oil company.
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"...without a written consent signed by the proprietor for the time being of the Charge dated 7 September 2011 in favour of Conocophillips"
Without written consent of this company.
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So, what is the practical upshot of all this? What it means is that you can certainly obtain a charge on his property; there is no problem in doing that.
However, you cannot force him to sell his house to get your money without written consent of this other company.
If you do get a charge on his house then, when he sells it, the mortgage is paid off first and then (assuming that it's just the oil company and you that have secured debts) the oil company is paid off next and then you.
If the house isn't enough to pay off your debt after paying off the mortgage and the oil company then it's just tough luck.