RU2662833C1 - Suspended emergency drilling unit for extracting stuck drill string - Google Patents

Abstract

FIELD: drilling of soil or rock.SUBSTANCE: invention relates to the field of drilling equipment and is intended for retrieving a stuck drill string and drilling tool in controlled directional and horizontal wells. Suspended emergency drilling unit for retrieving a stuck drill string or drilling tool in controlled directional and horizontal wells by drilling a parallel borehole includes a parallel mating drill string with a drill and a jet head. In this case, parallel mating drill string is connected rigidly and coaxially with a suspended guide bush equipped with teeth sliding along the stuck drill string.EFFECT: technical result consists in the increase in the reliability of the extraction of a stuck string or a drilling tool.1 cl, 2 dwg

Description

The invention relates to the field of drilling equipment and is intended to extract stuck drillstring and drilling tools in directional and horizontal wells.

Currently, in the construction of engineering communications using a trenchless method, horizontally directed well drilling (HDD) is widely used. HDD technology is characterized by frequent accidents, accompanied by the loss of expensive drilling and navigation equipment in wells. The time spent on attempts to eliminate accidents leads to an increase in the degree of sticking and abandonment (loss) of all or part of the drill string. The situation is complicated by the fact that there is no technology and equipment that can effectively remove a stuck drill string or drilling tool in directional and horizontal wells.

To extract a part of a drill string or tool, a method of drilling an auxiliary vertical well in a specific section of the emergency well is used, followed by the destruction of the integrity of the drill string to extract a part or drill tool through the emergency well or auxiliary well.

However, this method has limited use due to the presence of obstacles over the retrievable interval of the drill string or the inability to accurately localize the sticking area of the string. The method does not guarantee the elimination of sticking and the extraction of even part of the drill string or tool.

The disadvantages of the described method can be eliminated by drilling parallel to the well coupled with the subsequent release and extraction of the entire stuck drill string.

A device for drilling parallel conjugate wells (Author's certificate No. 1765344, E21B, 09/30/92, Bull. No. 36), comprising a cylindrical guide rod with a sleeve rigidly mounted on it and a drill rod with a drill bit mounted in the sleeve, the guide rod is made with a flat along the entire length, the sleeve is fixed at the end of the guide rod, and the drill rod is mounted in the sleeve with the possibility of axial movement.

However, the above device is intended for drilling in parallel with a paired well with the direction of the tool along a previously drilled well and cannot be used for guiding the drilling tool with a stuck drill string, the use of the device is limited to the perforating method of drilling.

The task aimed at the technical solution is to create a device that allows you to remove stuck drill string and drilling tools in directional and horizontal wells.

The technical result is to reduce technical risks when drilling directional and horizontal wells.

The specified technical result is achieved by the fact that the suspended emergency drilling unit for extracting a stuck drill string or a drilling tool in directional and horizontal wells by drilling a parallel mating well, including a parallel mating drill string with a drill and a hydraulic head, which for the purpose of high-quality and reliable release of the stuck columns or drilling tools connected rigidly and coaxially with the guide sleeve, which has the ability to chip zheniya on the stuck drill string, and its front shoulder equipped with teeth.

The invention is illustrated by the circuit shown in FIG. 1. Suspended emergency drilling unit consists of a housing 1 with a rigidly mounted guide sleeve 2 and a spindle 3 mounted on bearings parallel to the axis of the sleeve 2. A drill 4 equipped with hydraulic nozzles and a monitor head 5 are mounted on the spindle.

A description of the operation of the unit is shown in FIG. 2. The drill string parallel to the mating well 6 is assembled with a drill 4, an overhead emergency drilling unit 7, a hydraulic monitor head 5, a protective centralizer 8, connected by locks 9 to drill pipes. Suspended emergency drilling unit 7 is installed by the guide sleeve 2 on the stuck drill string 10. Next, drilling is carried out in parallel with the paired well 6 with a drill 4 using a horizontal directional drilling rig. The movement of the guide sleeve 2 along the stuck drill string 10 is ensured by the destruction of the annular face around the stuck drill string by the guide sleeve 2, which is equipped with teeth for active penetration into the rock and, in combination with a jet wash, ensures its destruction.

The destruction of the pillar formed between the stuck drill string 10 and a parallel mating well 6 is carried out by hydraulic nozzles of the drill 4 from the front side and the hydraulic head 5 from the back.

In order to prevent breakage of the drill string in parallel with the borehole 6 in contact with the released stuck drill string 10, protective centralizers 8 are provided.

After drilling in parallel to the associated well 6 to a predetermined site (for example, the location of the expansion tool of the tacked drill string 10), the drill string in parallel to the mated well 6 is removed, the stuck drill string 10 is freed up due to the 8-shaped cross section and is also removed.

In order to balance the moment of twisting of the column arising from the reaction of the cutting force of the drill, the axis of the guide sleeve may deviate to the right relative to the axis of the drill.

In accordance with the foregoing, the technical result of the invention is achieved by:

- unloading the compression zone of the rock stuck drill string;

- hydromonitor destruction effect;

- subsidence of the stuck drill string in the drilled face, formed by two parallel mating wells;

- the ability to drill parallel to the well to the tool (pilot or expansion) stuck drill string.

The industrial applicability of the technical result is confirmed by testing a prototype of a suspended emergency drilling unit by drilling in parallel to an associated well to extract a stuck drill string with a diameter of 168 mm. Driving a prototype unit was 90 m in three work shifts.

Using the proposed suspended emergency drilling unit allows you to extract stuck drill string and drilling tools in directional and horizontal wells, to reduce technical and economic risks.

The source of information

1. Copyright certificate No. 1765344 Е21В, 09/30/92. Bull. Number 36

Claims (2)

1. Suspended emergency drilling unit for extracting a stuck drill string or drilling tool in directional and horizontal wells by drilling a parallel mating well, including a parallel mating drill string with a drill and a hydraulic head, characterized in that the parallel mating drill string is rigidly and coaxially connected to hanging guide sleeve with the possibility of sliding along a stuck drill string, the front shoulder of which is equipped with teeth. 2. Suspended emergency drilling unit according to claim 1, characterized in that the axis of the suspended guide sleeve has a deviation to the right relative to the axis of the drill in order to balance the moment of twisting of the column arising from the reaction of the cutting force of the drill.

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