SU945386A1 - Borehole shutoff valve - Google Patents

Description

(3) WELL REMOVER

one

The invention relates to the mining industry, namely to devices used to shut off the wellbore of injection wells.

A device for blocking a well bore is known, comprising a pump, a packer and a rod interacting with a check valve D.

The drawbacks of the device are the complexity of the design, the presence of such parts as elastic sealing elements, slips, spring, rod, etc., as well as the inconvenience of repair and research work, because the device is cumbersome and narrows the central bore of the well, preventing the drilling tool from running , as well as research devices. A well bore cutter is known, which includes a housing, a check valve with a saddle and a gate made in the form of a ball, which has a positive buoyancy of G2.

The disadvantages of the device include the impossibility of simultaneously closing the tubing and the annulus, as well as the impossibility of removing the check valve without lifting the tubing. In addition, the device constricts the central bore of the well, preventing the devices from descending.

ten

The aim of the invention is to provide the possibility of overlapping the tubing and the annulus of injection wells, as well as the convenience of carrying out 5 repair work in the well.

The goal is achieved by the fact that the check valve seat is removable and is connected to the tubing string.

20

The drawing shows the device in the layout with casing and tubing, longitudinal section. 39 The cutter consists of a housing 1, made in the form of a thick-walled coupling, having connecting threads 2 at the ends and a thread 3 on the inner surface. The inner surfaces of the ends of the body are made wider under a truncated cone with a large base, passing into the cylinders and directed towards the ends for better and unobstructed passage of drilling tools, etc. if necessary, their use in research and repair work, as well as to improve the fit of another part to it. The body is equipped with a protector made in the form of a sleeve, having an external response load of 3 threads and an internal connecting thread 5- The upper end of the protector is made with a head 6, the outer surface of which is made under a truncated cone for 1. The lower end of the tread has a seat 7 for the ball 8 constituting together with. It has an open ball valve. The work of the bore hole shutter is as follows. During the construction of the well, the body 1 of the trimmer is pre-installed permanently between the casing 9 and 10 in the required interval. For example, to cut off the wellbore from the producing formations 11, it is placed higher on M from the producing formation, and if necessary to cut off the borehole between the producing formations - in the middle of the impermeable formation separating these formations. t After the casing string is lowered and cemented, a ball 8 with a diameter slightly larger than the inner diameter of the tread hole A is thrown into the well, but with the possibility of passing through the central channel of the housing 1. The ball can be made of, for example, polyethylene, polystyrene or hollow metal etc .. with the possibility of swimming in a liquid. Next, the protector is lowered into the well on the column of compressor pipes 12, while simultaneously pushing the ball B into the barrel into the central channel of the housing. Upon reaching the tread of the upper part of the body, rotating the column with the compressor tubes it is screwed into the body, with the ball, the CES ball 8 is located in the lower part of the body, adjacent to the tread seat 7, and occupies the working position. This completes the installation of the device and the well is ready for operation. When pumping fluid into the reservoir 11, the ball 8 under the pressure of the fluid departs from the saddle 7, thereby ensuring the passage of fluid through the tread channel. When fluid injection ceases, the ball again sits on the saddle and cuts off the formation from the rest of the wellbore. In addition, the protector simultaneously serves as a cutter of the annulus from the formation of the well. If it is necessary to perform an underground repair, the tubing is unscrewed from the tread and raised to the surface for subsequent descent into the well of the necessary downhole tool. The device is simple in design, it lacks such unreliable parts as shlips, elastic, packer elements, springs, rod and. It can work as a cut-off well bore, and the annulus. The use of the device provides convenience when carrying out a complex of geophysical studies and repair work in the well, since, thanks to this design, it is possible to maintain the maximum possible diameter of the wellbore, i.e. prevent excessive narrowing. For example, the inner diameter of the device body 1 can be made with a size of up to 124 mm, and the tread can be made up to 110-112 mm, which allows for the processing of the bottomhole zone, drilling, washing and other repairs, while using known devices Part of this work is not possible. The device is reliable in operation, ensures complete immobility and tightness in all types of wells, including high-temperature ones, while existing devices of similar purpose allow the packer devices to move along the wellbore during pulsations, pressure, temperature or stress and lose tightness.

Claims (1)

Claim A wellbore cutter comprising a body, a non-return valve with a seat and a shutter made in the form of a ball, having positive buoyancy, characterized in that, in order to enable overlapping of the tubing and the annulus of the injection wells, as well as the convenience of repair work in well, the back valve seat 5 is removable and connected to the tubing string