RU2082866C1 - Drilling tool - Google Patents

Abstract

FIELD: well drilling with continuous lifting of core. SUBSTANCE: drilling tool has rock cutting tool with water courses and connected outer barrel string with radial channel and packer located under it, inner barrel string with ribs, which separate interbarrel space into two isolated chambers. Inner barrel string components have retainers from turning and those of outer barrel string have safety locks. The latter are located on both sides of radial channel for engagement with ribs of inner barrel string. Retainers may be made in form of cam pair, and safety locks are made in form of pins or screws. EFFECT: higher efficiency. 3 cl, 3 dwg

Description

 The invention relates to the field of drilling equipment, namely to shells for drilling wells with continuous core removal.

 Known drill, including a double drill string and rock cutting tool connected to an external drill string (ed. St. USSR N 474598, CL E 21 B 10/02, 1972).

 Also known is a drill containing internal and external drill strings connected to a rock cutting tool having a packer and a radial channel located below the packer (USSR patent N 878208, class E 21 B 25/00, 1976).

 Another drill is known, containing interconnected rock cutting tools with flushing channels, a packer, a double drill string with a packer and a radial channel on the outer pipe (US patent N 4057118, CL 175-215, 1977).

 Common disadvantages of these drill bits are the poor quality of the core, the difficulty of linking the core to the drilling interval, and the significant time required for laying and processing core material. This is explained by the fact that core material, especially when drilling through soft rock, when transported to the surface through an inner column, is mixed with the rock destroyed by the drill bit and increases in volume by 2 3 times depending on the width of the end face.

 The closest to the proposed technical essence and the achieved result is a drill containing a rock cutting tool with flushing channels, an inner pipe with ribs on the outer surface dividing the annulus into two isolated cavities, and an outer pipe connected with the rock cutting tool with a radial channel and located above him packer (ed. St. USSR N 1350329, class E 21 B 21/00, 1985).

 The use of this projectile due to the separation of the annular space into two isolated chambers, one of which is used to supply flushing fluid, and the other to drain sludge, significantly improves the quality of core material and ensures its accurate reference to the drilling interval due to separate core transportation, destroyed material and separate processing.

 However, taking into account that the pipes of the inner column are fixed to each other only from axial movement, during drilling, it is possible to turn one pipe relative to the other, leading to a violation of the isolated chambers and their communication with each other. In addition, due to the rotation of the inner column, a case of overlapping ribs of the inner column of the radial hole is possible. All this reduces the efficiency of this projectile.

 In this regard, the main objective of the invention is the elimination of these disadvantages by increasing the reliability of the projectile.

 This problem is solved in that in a drill, containing a rock cutting tool with flushing channels, an inner pipe with ribs on the outer surface dividing the annulus into two isolated cavities, and an outer pipe connected to the rock cutting tool with a radial channel and a packer located above it according to the invention , the pipes of the inner column are provided with locks from rotation, and the outer column is fused, located in plan in the zone of the radial channel on both sides of it, while the fuses are fixed to the lower pipe, and the latches are made in the form of a cam pair, and the protrusions and their corresponding grooves are located on the contacting ends of the ribs.

 The presence of clamps ensures the safety of isolated chambers and eliminates the possibility of communication between pressure and sludge flows, and fuses exclude the possibility of blocking the radial channel by the ribs of the inner column. The implementation of the clamps in the form of cam pairs is selected based on the simplicity of the design, and their location on the ribs based on the requirements of maintaining the strength of the column, since the grooves on the ribs do not weaken the inner column.

 In FIG. 1 shows the lower part of the projectile in a section, a general view; in FIG. 2 section AA in figure 1; figure 3 node connection pipes of the inner column.

 The drill contains a rock cutting tool in the form of a crown 1 with flushing channels 2, a packer 3 and a double drill string with outer 4 and inner pipes 5, the annular space between which is divided by ribs 6 into two cavities 7 and 8 isolated along the entire length of the string. The cavity 7 is communicated with flushing channels 2 crowns 1, and a cavity 8 with a radial channel 9 in the wall of the outer pipe 4 below the packer 3. On both sides of the radial channel 9 in the plan fuses 10 are installed, for example, in the form of pins, screws, etc. that exclude the possibility zhnosti channel 9 overlap the ribs 6 when cranking the internal column 5. The latter in turn is provided with latches 11 in the form of cam pairs, which protrusions 12 and grooves 13 facing one another the ends of the contacting edges 6.

 Drill works as follows.

 During drilling under the influence of axial load and torque, the working elements of the crown 1 destroy the rock, which is transported to the surface through the inner column 5 through a cleaning agent supplied through the cavity 7 and flushing channels 2 to the bottom of the well. At the bottom, part of the cleaning agent enters the inner pipe 5 and transports the core, and the other part of the cleaning agent captures the destroyed rock, feeds it to the under-chamber zone, from there through the radial channel 9 into the cavity 8 and then along it to the surface in special trays or containers, depending from geological requirements and core material.

 Due to the use of clamps 11, the pipes 5 do not rotate relative to each other after their connection, which guarantees the safety of the combined position of the ribs 6, and therefore the integrity of the cavities 7 and 8. In the case of rotation of the entire inner column 5, the ribs 6 come into contact with the fuses 10, which will not allow to block the radial channel 9.

 Thus, when working with this projectile, core and sludge are transported through separate channels without contacting each other. Due to this, only core material is processed on the surface, the length of which practically corresponds to the penetration interval, which increases the accuracy of core material binding along the depth of the well.

Claims (3)

 1. A drill containing a rock cutting tool with flushing channels, an external pipe string connected to it with a radial channel and a packer located above it, an internal pipe string with ribs on the outer surface dividing the annulus into two insulated chambers, one of which communicates with the flushing channels, and the other with a radial channel, characterized in that the pipes of the inner column are equipped with locks from rotation, and the outer column is fuses placed on both sides of the radial Nogo channel to cooperate with the inner edges of the column.  2. The projectile according to claim 1, characterized in that the latches are made in the form of a cam pair, and the protrusions and their corresponding grooves are made on the contacting ends of the ribs.  3. The projectile according to claim 1, characterized in that the fuses are made in the form of pins or screws mounted on the lower pipe of the outer column.

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