SU832042A1 - Method of hydromechanical drilling of boreholes - Google Patents

Description

The invention relates to drilling wells, and more specifically to hydromechanical drilling, in which the destruction of rocks occurs as a result of the combined action of high-pressure 'jets of flushing agent and armament of the bit.

There is a method comprising a flushing agent injected into a drill string during rotary drilling of wells, which is supplied to the bottom in the form of jets through flushing holes of the Dopot and, together with the armament of the bit, destroy the bottom [l].

However, the effectiveness of such destruction is small.

There is also known a method of hydromechanical drilling, which consists in the fact that the flushing agent is pumped into the drill string and fed to the face through the nozzles of the hydraulic monitor bit in the form of high-pressure jets, which together with the armament of the bit produce the destruction of the face. Drilled rock is transported to the surface by a flushing agent flow moving in the annulus [2].

However, the known method is also not very effective due to insufficient pressure drop in the nozzles of the bit.

The purpose of the invention is to increase the efficiency of rock destruction by increasing the differential pressure in the nozzles of the bit.

This goal is achieved by the fact that an additional agent, insoluble in the main washing agent, is autonomously supplied to the face, the density of which is greater than the density of the main washing agent.

The drawing shows a diagram of a method of hydromechanical drilling.

The bit 1 with flushing holes 2 is connected to the drill string 3 ,.

connected through mud pumps 4 to the barn 5. Inside the column 3 is an autonomous channel 6 with nozzles 7, led through the bit I to the bottom. Avz 8;

tonal channel 6 through the pump 8 is connected with the barn 5. On the suction line of the pump 8 is a fine filter 9. The annulus 10 is connected to the barn 5 by a gutter system 11.

The method is as follows.

In the process of drilling, an additional agent is pumped into the stand-alone channel 6 by pump 8 and fed to the bottom through a nozzle 7. The main flushing agent is pumped by pumps 4 to the drill string 3 and fed to the bottom through two auger holes. 1. Two agents are drilled to the surface of the mixture rock is carried out through the annulus 10 almost entirely due to the power of the spring pumps 4.

In this case, the pressure drop in the nozzles of the chisel, determined by the pressure difference in the autonomous canopy 6 (hydrostatic pressure of the column of the additional pipe plus the pressure provided by Casas 8) and in the annulus ^; О (hydrostatic pressure of the column of a mixture of two agents), increases by • • el.

Since the additional and main washing agents are insoluble or slightly soluble in each other and differ in density, they are easily separated in the receiving barn 5. The advantage of the method is that the volume of the additional agent is part and, moreover, less _{than the} volume of mixture ₅ si two agents that improve cleaning, for example, by installing a filter 9 on the suction line of the pump 8.

Claims (2)

(54) THE METHOD OF HYDRO-MECHANICAL DRILLING OF THE WELLS Tonomic channel 6 through the pump 8 is connected to the barn 5. A filter 9 is placed on the suction line of the pump 8 and is cleaned. The annulus Yu is connected to the barn 5 by the channel system 11. The method is carried out as follows. In the roceose, more agai is drilled; pumped by pump 8 into an autonomous channel 6 and fed to the bottom through the attachments 7. The main flushing agent is whipped by pumps 4 into the drill string 3 and fed to the bottom through the spOiAbKJBOHUbie hole of 2 bits I. Tra: Orienting two agents to the surface the rock is carried along the pipe space Yu almost entirely due to the power of the pumps 4. At the same time, the pressure drop into the head of the city scientist, determined by the pressure difference i ai, ToHOMHOM channel 6 (additional pressure of the additional column plus pressure provided by it "Ci; oivj 8) and in the annulus 10 (i-during the static pressure of the column, months; and two agents), increases by the greenness of the difference of hydrostatic pressures of the additional agent column and clciLOti. mixture of two agents, which increases with the well angle. Since the additional and primary marketing agents are insoluble. Or weak & soluble in each other and vary in density, they are easily separated in the receiving barn. The advantage of the method is that the volume of the additional agent is a part, and a smaller one, of the volume of the mixture of two agents, which allows for improved cleaning, for example, by installing a filter 9 on the suction line of the pump 8. Invention Hydromechanical well drilling method: in, including through the bit of the washing agent to the bottom, followed by transporting it with the cuttings to the surface, differing from m < l, which, in order to increase the efficiency of rock destruction by increasing the pressure drop in asadkah bit, to the bottom of the supply autonomously m insoluble washing agent mainly additional agent, which has a density greater than the density main wash agent. Sources of information taken into account during the examination 1. Yu. V. Vadetsky. Drilling of oil and gas wells, M., Nedra, 1973, p. 1O7-1O8. 2. Mitelman B.I. and Guzman A.M. Hydromechanical and erosion drilling. ., VNIIOSNG, 1971, p. 6-26 (prototype).