RU1824494C - Device for casing running in and cementation - Google Patents

Abstract

Use1 launching and cementing casing strings for oil and gas wells. The inventive device is equipped with a spring-loaded rod with milled grooves, the hammer is made with a through axial channel and has an additional protrusion on the inner surface, while the rod is placed about the axial channel of the hammer with the possibility of interaction of its cylindrical surface with an additional protrusion of the hammer. The lengths of the protrusions of the housing and the stem are related by the ratios h hi and H Hi. 1 s.p. 3-silt

Description

The invention relates to the oil, gas and exploration industries, and in particular to devices for lowering and cementing casing strings.

The purpose of the invention is to expand the scope of the device by increasing the impact power and efficiency.

In FIG. 1 shows a device in a static state; FIGS. 2 and 3 are sections A-A and BB in FIG. 1.

The device includes a housing 5, the inner surface of which has a cylindrical protrusion 7, the upper 1 and lower 11 translators. In the housing on the spring 9, a hammer 6 is installed with a through axial channel and an additional protrusion on the inner surface. With the upper translator 1, the stem 4 is rigidly connected to the milled grooves. A spring 2 is installed on the stem, which interacts with the hammer 6. An anvil is placed in the lower part of the device 10. The hammer on the outer surface has milled grooves 8. The solution flow is blocked over cylindrical surfaces 3 and 7, which have a guaranteed clearance. The lengths of the cylindrical surfaces of the hammer and rod and the body and hammer are related by the ratios h hi and H HL

The device operates as follows.

The device is screwed onto a portion of the casing before launching. When the column moves along the wellbore, the drilling fluid pressures the hammer 6 upward and the flow through the milled grooves 8 in the hammer and rod fills the casing. Moreover, depending on the speed of descent, the hammer can perform oscillatory processes, compressing the upper spring 2 and blocking the flow of the solution, which leads to the formation of hydraulic pressure pulses causing vibrations of the lower part of the column, which facilitate its free passage in the well.

If sticking occurs or the casing is tightened, drilling fluid is pumped. Under the influence of the pressure of the solution on the upper area of the striker along (L

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the latter begins to move downward, compressing the spring 9. At the same time, at the beginning the passage for the solution opens through the grooves of the rod 4, and then through the grooves of the hammer 6 (h hi; H Hi). In the latter case, a large area opens up for the exit of the solution, as a result of which the pressure drops sharply. The drummer under the action of the force of the compressed spring 9 moves upward, overlapping

the solution current is first ledge housing, then the rod. Since the length of the striker from the point of overlapping 7 flows to the upper area of the striker is large enough, the pressure wave will come simultaneously

It is with the pressure that occurred when the flow was blocked at location 3. In this case, the firing pin moves by inertia and compresses the upper spring. The newly arisen increased pressure as a result of blocking the flow in two places sharply moves the blow down. Here, inertial forces come into play and the process repeats.

The creation of high-frequency dynamic loads leads to a sharp decrease in friction between the walls of the well and the stuck tool, which leads to the release of the tool from sticking.

Thus, a feature of the operation of the proposed device is the ability to use two hydraulic shocks to move the striker down, as a result of which its speed and frequency of shocks increase, which leads to an increase in shock power and efficiency.

When changing the flow of the solution, the device can operate both in shock and shockless mode with an adjustable frequency. When cementing a well, the device allows operation at high flow rates. This is important since cementing takes place in a short amount of time.

Hydraulic pressure impulses created by the device contribute to better cleaning of clay walls of the well

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mortar before cementing it. The high-frequency mode of operation of the device disperses cement slurry better, compacts it, improves the filling of the annulus and increases the strength of the stone formed.

There are no sealing elements in the device. Places of blocking the flow of the solution are reinforced with wear-resistant material. All this makes it possible to increase the stability of units when working in aggressive environments at elevated pressures and temperatures, and to store the device at low temperatures.

The proposed device system can be used in designing a hammer for drilling a well. For these purposes, the spindle, consisting of an anvil and a lower sub, is made movable.

The economic effect will be obtained due to the wide use of the device for various purposes of well construction.

Claims (2)

1. A device for lowering and cementing casing strings, including a housing, a spring-loaded striker with interacting cylindrical protrusions and an anvil, characterized in that, in order to expand the scope of the device by increasing the impact power and efficiency, it is equipped with a spring-loaded rod and milled grooves, the hammer is made with a through axial channel and has an additional protrusion on the inner surface, while the rod is placed in the axial channel of the hammer with the possibility of interaction a cylindrical surface with an additional protrusion of the hammer. 2. The device according to claim 1, characterized in that the lengths of the protrusions of the body striker and the rod are related by the ratios h hi and H Hi. Figure 1 Editor Compiled by V. Nazarov Tehred M. Morgenthal Proofreader M. Andrushenko