Tubing sand pump

Claim 1

Cleanout equipment for cleaning debris from an oil well which includes a. a well bore extending far beneath the surface of the earth, b. casing in the bore, c. a tubing string in the casing, d. a derrick above ground over the well bore, e. hoisting means on the derrick connected to the tubing string for raising, lowering, and reciprocating the tubing string, and f. liquid in the well; g. wherein said cleanout equipment comprises in combination with the above: h. a mandrel connection threadedly attached to the bottom of said tubing string, hh. said mandrel connection having drain holes therethrough, hhh. said drain holes fluidly connected to the inside of the tubing string so that liquid may freely pass into and out of the tubing string, j. a hexagonal mandrel attached to the mandrel connection and slidingly telescoped through k. a barrel top fitting having a hexagonal bore below a cylindrical bore, kk. holes through the barrel top fitting at the top of the hexagonal bore, the barrel top fitting threadedly attached to the top of l. a barrel having a barrel bore, m. a double action swab reciprocatingly within said barrel bore mounted on n. a tubular swab holder, o. a knocker threadedly attached to the swab holder and the mandrel, thus attaching the swab to the mandrel, p. the knocker having therein i. a valve seat adjacent the swab holder, ii. a ball valve, and iii. fluid passages through the knocker between the valve seat and the mandrel, q. so that liquid may pass through the tubular swab holder, valve seat, and fluid passages into an annular space between the mandrel and barrel, qq. a square shoulder on said knocker at the mandrel, qqq. the outside diameter of said shoulder being greater than the inside diameter of the barrel top so that the upward travel of the mandrel is limited, and so that sand may be flushed away from the top of the knocker, qqqq. the fluid passages in the knocker on the mandrel form restricted passages so that the fluid flowing from the knocker has sufficient velocity to flush debris from the swab, the knocker and its square shoulder, r. a restricted passsageway at the top of the barrel forming means for limiting the velocity of travel of the mandrel by the passage of liquid through the restricted passageway thereby preventing overload of too much debris, s. a tubular barrel transition threadedly attached to the bottom of the barrel, t. a tail pipe threadedly attached to the barrel transition, u. a tubular head holder threadedly attached to the tail pipe, v. a flap valve on the head holder, and w. a bottom head threadedly attached to the bottom of the head holder, x. the cross sectional area of the mandrel being about half the cross sectional area of the barrel bore, y. the cross sectional area of the restricted passage at the top of the barrel being about 1/10 the cross sectional area of the barrel bore, and z. the cross sectional area of the combined fluid passages through the knocker being less than about 1/10 the cross sectional area of the barrel bore.