Horizontal well circulation tool

Method of washing contaminant particulate matter within the linear end portion of a subterranean well, said well having a deviated configuration including an entry portion communicating with a curved portion extending downwardly in the well from said entry portion and a generally linear end portion traversable with a production formation, comprising the steps

• (1) securing onto one end of a continuous length of remedial tubing introduceable into said subterranean well concentrically through production tubing previously positioned within said well, an apparatus having:
• (a) first cylindrical housing;
• (b) means at one end of said housing for carryable securement relative to said one end of said remedial tubing;
• (c) a fluid expansion chamber exterior of said housing;
• (d) fluid passageways communicating between the interior of said first cylindrical housing and said expansion chamber;
• (e) turbulating sleeve means carried exteriorly around said housing and immediate said expansion chamber and freely rotatable relative to said housing;
• (f) a series of fluid compression ports radially disposed through said sleeve means, whereby fluid flow from the top of said well through said remedial tubing in excess of a pre-determinable pressure will be transmitted through said housing, said passageways, and into said compression chamber and said fluid may be thereafter injected through said fluid compression ports to actuate rotary motion of said sleeve and turbulize said fluid for washing action within said linear end portion of said well;
• (g) a second cylindrical housing positioned between said first cylindrical housing and said remedial tubing;
• (h) normally closed wash ports circumferentially extending radially around said second cylindrical housing and angularly directed rearwardly relative to said apparatus and toward said remedial tubing;
• and
• (i) means for closing said wash ports and selectively movable to communicate said wash ports with the interior of said second cylindrical housing, whereby, upon retrieval of said remedial tubing to the top of the well, said means for closing said wash ports may be manipulated to open said wash ports and wash fluid may be introduced into said apparatus and ejected only through said wash ports to drive particulate matter impacted exterior of said remedial tubing and said apparatus away from said apparatus.
• (2) inserting said continuous remedial tubing with said apparatus secured thereon into said well to position said apparatus immediate the generally linear end portion of said well;
• (3) introducing a washing fluid through said remedial tubing and said apparatus in excess of a predeterminable pressure;
• (4) transmitting said pressured washing fluid through said expansion chamber and said fluid compression ports to actuate said sleeve means into rotary motion relative to said housing and turbulize said fluid to wash said contaminant particulate matter away from said apparatus to thereby form a suspension of said particulate matter within fluid exterior of said apparatus and said tubing for subsequent removal to the top of the well;
• (5) moving said means for closing said wash ports to communicate said wash ports with the interior of said second cylindrical housing;
• and
• (6) introducing fluid through said remedial tubing and said apparatus as said remedial tubing is retrieved through said production tubing to the top of the well whereby during said retrieval of said remedial tubing to the top of the well introducing wash fluid into said apparatus and ejecting said wash fluid only through said wash ports to drive particulate matter impacted exterior of said remedial tubing and said apparatus away from said apparatus said apparatus is retrieved to the top of the well.

Method for washing particulate matter impacted exterior of remedial tubing away from said remedial tubing as said apparatus is retrieved to the top of a subterranean well, said remedial tubing being previously introduced into said subterranean well and concentrically inserted through production tubing positioned within said well, comprising the steps of:

• (1) securing to said remedial tubing at the top of said well an apparatus comprising:
• (a) a cylindrical housing;
• (b) normally closed wash ports circumferentially extending radially around said cylindrical housing and angularly directed toward said remedial tubing;
• and
• (c) means for closing said wash ports and selectively movable to communicate said wash ports with the interior of the cylindrical housing, whereby, upon retrieval of said remedial tubing to the top of the well, said means for closing said wash ports may be manipulated to open said wash ports and wash fluid may be introduced into said apparatus and ejected only through said wash ports to drive particulate matter impacted exterior of said remedial tubing and said apparatus away from said apparatus as said apparatus is retrieved to the top of the well;
• (2) introducing said remedial tubing and said apparatus into the well;
• (3) actuating said means for closing said wash ports to communicate said wash ports with the interior of the cylindrical housing;
• and
• (4) introducing wash fluid through said opened wash ports while said remedial tubing is retrieved through said production tubing to the top of the well whereby fluid may pass through said wash ports in a generally planar configuration directed away from said apparatus and toward said remedial tubing to wash particulate matter impacted exterior of said remedial tubing and said apparatus away from said remedial tubing and said apparatus.