Counting Of Occurrences Of A Word In A Text Field

Finding numbers of occurrences of a string of characters
in a column of TEXT datatype.
DDL of involved table txt:
create table txt (pk int, txtcol text) -- datatype of pk doesn't matter

declare @word varchar(80) set @word='help'
declare @pk int, @count int, @i int, @dl int, @wl int
set @wl=len(@word)
declare abc cursor for select pk from txt
where patindex('%'+@word+'%',txtcol)>0 order by pk
open abc fetch next from abc into @pk
while @@fetch_status=0
begin
select @dl=datalength(txtcol) from txt where pk=@pk
select @i=patindex('%'+@word+'%',txtcol)+@wl from txt where pk=@pk
set @count=1
while @i<@dl
begin
select @count=@count+(len(substring(txtcol,@i,8000))-
len(replace(substring(txtcol,@i,8000),@word,'')))/@wl
from txt where pk=@pk
set @i=@i+8001-@wl
end
select pk=@pk, occurrences=@count
fetch next from abc into @pk
end
close abc deallocate abc
pk occurrences
----------- -----------
1 1

pk occurrences
----------- -----------
2 2

pk occurrences
----------- -----------
3 11
Edit: as suggested-reminded by jsmith8858.