The invention discloses a blocking controlling and leaking stopping tool
assembly applied to
drilling engineering. The blocking controlling and leaking stopping tool
assembly comprises an inner
barrel, a cylinder sleeve, a locking ring, a locking sleeve, a sealing and separating glue
barrel, an end base, a rubber plug base, a ball seat, a ball, a front rubber plug and a back rubber plug, wherein the ball seat is matched with the ball, and the rubber plug base is matched with the front rubber plug and the back rubber plug. The inner
barrel is sleeved with the cylinder sleeve which can move. The end base is arranged at the lower end of the inner barrel in a sleeved mode. The sealing and separating glue barrel is arranged between the locking sleeve and the end base. The cylinder sleeve is arranged above the locking sleeve. Circulating holes are formed in the inner barrel. The invention further discloses a method for stopping
well drilling leaking through the blocking controlling and leaking stopping tool
assembly. The method comprises the following steps that the blocking controlling and leaking stopping tool assembly is placed downwards to a well; the ball is thrown to the needed position to increase the pressure, and the sealing and separating glue barrel is used for sealing in a sitting mode; heavy mud is recycled; the front rubber plug is pressed to the needed position, and water and mud injection is carried out; the back rubber plug is pressed to the needed position; the mud is replaced; the pressure is increased to knock down the ball seat; the mud is continuously replaced until the back rubber plug makes contact with the front rubber plug; mud replacing is stopped, and the tool assembly is pulled out of the hole;
cement setting is carried out, and leaking stopping is finished. When the tool assembly is used for stopping leaking of the well, annulus mud and
formation fluid cannot be mixed into
cement paste,
pollution is not produced during waiting on
cement stopping, and the setting strength of a
cement sheath plug is high.