SU1348478A1 - Method of drilling holes by impact pulses - Google Patents

Abstract

The invention relates to the drilling of wells in rocks with low plasticity, and reduces energy consumption and increases drilling efficiency. The method includes the sequential application of periodic strikes each. from a given set of strikers in the adjacent section of the slab. The strikes are carried out (discretely from the center to the periphery of the bottom with the overlapping of the surface of the latter. After the strike, the head is detached from the bottom, and directly into the hole formed by each blow. cleaning agent. The strike of each subsequent striker is applied after the previous striker stops contact with the slaughter and so on until the entire surface is completely destroyed at the specified depth. 1 ill. with S (L with 1 00 4 00

Description

The invention relates to the drilling of wells, in particular to the drilling of wells in rocks with low plasticity.

The aim of the invention is to reduce energy consumption and increase efficiency.

The drawing shows devices for implementing the proposed drilling method.

The device consists of a housing 1, a coaxial flush pipe 2, an electronic distributor 3 with cable leads 4, strikers 5 with four teeth 6, support struts 7, electromagnetic shock mechanisms 8, strikers 9 with three teeth 10, supply current 1,

Case 1 is hermetically divided in height} with 1 partitions into three compartments. The middle compartment 12 is flushing, connected by means of a flushing pipe 2 to the internal channel of the drillstring 13. The heads 5 and 9 are made with an axial flushing channel 14, for example, L-shaped and spring-loaded relative to the housing 1.

The upper compartment 15 is electronic; the lower compartment 16, for example, is filled with a dielectric fluid, and electromagnetic shock mechanisms 8 are placed therein electrically connected via terminals 4 to the distributor 3. The distributor 3, in turn, is electrically connected to an electrical source (not shown) located on surface through the current lead 11. In this case, the housing 1 has a base 17 in the form of a circle.

In the drawing, the device depicted buried in the well. It rests on the bottom of the pillars 7, and the teeth of the strikers 5 and 9 do not touch the surface of the slab, with the exception of the rightmost striker.

The method is carried out as follows.

Before the device is lowered into the well of the electronic distributor 3, a program is defined: the scheme of striking blows, one blow, the number of strokes per unit of time, the strength of the strikes (depending on the physical and mechanical properties of the rocks) and the order of strikes.

Then the device is lowered into the well, de, that while, if necessary, npl) Nfl, iBKH.

The flushing fluid (gas, gas mixture) is supplied through pipe 2 to compartment 12, and from there through L-shaped flushing channels 14 of the strikers 5 and 9, the liquid enters the bottom and into the annulus.

After the device is installed at the bottom of the well, the device is fed

in the electrical power supply current 11, the electronic distributor 3 is turned on, which alternately in a predetermined order turns on the electromagnetic percussion mechanisms of the 8 dies.

A right-handed firing pin 5 with four teeth 6 strikes at the face, at this moment the channel 14 of the firing pin is blocked, i.e. the flushing agent is not delivered to the bottom of the affected area, and the flushing channels of the remaining 14 dies. 5 and 9 are open, i.e. the rest of the surface is buried by the flushing agent, while the drilled rock is removed from the bottom.

After the impact, this firing pin is detached from the bottom, and a flushing agent is fed into its washing channel, which flows directly into the hole formed from the destruction and washes away

from her breed.

Then the next firing pin is struck on the face, and so on until the complete destruction of the entire face of the face to a predetermined depth by a series of

beats. Impacts are delivered discretely from the center to the periphery of the bottom.

The striking scheme can be a ring: the first blow is applied to the center of the bottom, and the subsequent blows

series - in concentric circles, the radius of which increases in the direction from the center to the walls of the well, and radial: the first blow is applied to the center of the bottom, and the subsequent

series blows - along the bottom radius in the direction from the center to the borehole wall. An annular lesion drilling scheme provides drilling with the proposed method with coring.

Diving drill

the well (flow) occurs as the bottom is drilled and cleaned of the drill cuttings under the action of its own weight of the drill bit, i.e.

The drill string is in an extended state all the time, since when drilling by this method there is no need for axial load, i.e. no need to press the drill

the bottom, because for the destruction of the bottom is used the kinetic energy of the strikers, rigidly connected with the rock-breaking teeth and not in contact with the surface being destroyed in the initial position.

In addition, such a striking arrangement with a rock-cutting tool (teeth) allows an increase in the destruction efficiency by 20% in comparison with the known arrangement (a striker-anvil) with the same impact energy.

Since the bottom hole shape in terms of the method of drilling is determined by the shape of the strikers on the base of the drill string and there is no need to rotate the drill bit around the axis of the well, it is possible to choose a bottom shape different from the circle. For example, in unstable rocks, the slab shape may be in the form of an ellipse, which significantly

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increase the stability of the walls of the well, etc.

Claims (1)

Invention Formula The method of well drilling with shock pulses, including the sequential application of periodic blows by each of a given set of strikers to the adjacent bottom section and the supply of a cleaning agent, characterized in that, in order to reduce energy intensity and increase K11D, sequential application of periodic blows is carried out with the overlapping of the surface of the latter, the supply of the cleaning agent is carried out directly into the well formed by each blow, and the blow is alternated with the supply of the cleaning agent In this case, each subsequent striker is struck after each contact of the previous striker with the slaughter stops. one JO // /// I /// /// / К / /// Compiled by A. Khromin Editor L. Veselovska Tekhred L. Serdyukova Proofreader A. Zimokosov 5173/31 Circulation 532 Subscription VNIKNI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4