RU2684537C1 - Water thermal drill tip - Google Patents

Abstract

FIELD: soil or rocks drilling.

SUBSTANCE: invention relates to the wells in the ice thermal drilling devices, and can be used for the glaciers internal structure and the sea ice accumulations, hummocks and stranded hummocks, studying. Wells in the ice drilling device, connected to the water thermal drill in the form of a tip, contains a hollow cone-shaped body. At the tip end a valve is coaxially located, opening in the presence of certain force directed against the thermal drill movement, and blocking the water flow if there is no force thereon. Thus, with the drilling speed and water flow rate depending on the depth simultaneous recording to the computer or logger and the records subsequent processing by the water zero flow rate, the device allows to record the thermal drill tip exit from ice to the cavity, which, together with the drilling rate data, gives the voids in ice formations boundaries position and sizes.

EFFECT: enabling the voids in ice heaps boundaries and sizes determination during their drilling with hot water.

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Description

The invention relates to a device for thermal drilling of wells in ice and can be used to study glaciers and piles of sea ice, hummocks and ham. A method for determining the structure of hummocks and hammers, the properties of ice and the boundary of ice and soil by thermal drilling of wells is described in [4]. When drilling wells in hummocks and shafts, the drilling speed, input power, temperature and pressure of melt water at the bottom are recorded on a computer.

It is known that core and coreless drilling by electrothermoburas developed in the Arctic and Antarctic Research Institute [1, 2], which have been used to study glaciers and sea ice since 1970, has the advantage of electrothermoburs with relatively low weight, the ability to drill wells to the entire depth of hummocks, the ability to determine the size and location of voids in ice with high accuracy. The disadvantage is the low speed of drilling ice.

A device for water drilling of wells in ice [3] is known, which is a thermally insulated pipe through which hot water is delivered through a rubber hose to a bottomhole. Water melts the ice, and the pipe falls under the influence of its gravity. As it goes deeper into the ice, a pipe having a threaded connection builds up. The disadvantage of this device is the high water consumption and low productivity, because due to the free flow of hot water, a wide well is formed.

A device for water drilling wells in ice [5]. The disadvantage of this device is not high enough performance.

The closest adopted prototype is a device for thermal drilling of ice with a jet of hot water [6], in which hot water is discharged from a cone-shaped tip at the end of the drill. Such a tip is significantly elongated (up to 30 cm in length). A jet of hot water discharged from the tip forms a face in the ice, and further expansion of the well occurs due to ice melting on the side surface of the tip. The advantage of such a tip for a water thermal drill is its high drilling speed. The disadvantage is that when using it to study the internal structure of large ice formations, when the presence or absence of voids is determined by the speed of immersion of the drill, it is impossible to fix voids whose vertical size is less than 15-20 cm, due to the large length of the tip of the thermal drill, which the shell hangs when the drill sock leaves the void. Melting of the walls of the well continues with the hot conical part of the tip of the thermal drill, and the movement of the thermal drill remains uniform until a subsequent dip into the void, if its vertical size is greater than the length of the tip. During ice melting by the side part of the thermal drill tip, the water jet from the central hole continues to beat forward and destroys the underlying blocks of ice, thereby distorting the real picture of the configuration of ice blocks in the body of the hummock formation. At small sizes of emptiness, the thermal drill does not fail, and the presence of emptiness is not fixed.

The purpose of the invention is to increase the sensitivity when using a device for determining the position of the boundaries and sizes of voids in ice piles during their drilling with hot water.

The specified goal is achieved by the following actions:

1. At the end of the conical tip of the thermal drill, a valve is installed that opens when there is some force directed against the movement of the thermal drill and blocks the flow of water if there is no pressure on it. Thus, if the tip of the thermal drill abuts against ice, the valve opens and drilling occurs. As soon as the tip of the thermal drill enters the cavity, the valve blocks the flow of water, and melting occurs on the side surface of the tip.

2. In the process of thermal drilling-ice melting, the drilling speed and water flow rate are recorded on a computer or logger depending on the depth of the well.

3. In the subsequent processing of these data on a computer, the dependence of the drilling speed is compared with the dependence of water flow. Zero water flow rate corresponds to the outlet of the thermal drill tip into the cavity, regardless of the fact that the drilling speed due to the hang of the thermal drill on the side walls of the tip on the records corresponds to the movement of the thermal drill in dense ice.

The proposed device provides a large amount of necessary objective information about the internal structure of hummock formations. The economic effect of using the proposed method consists in saving time of highly qualified specialists in the field. Given the increased interest in the structure of hummock formations in hydrocarbon production areas on the shelves of freezing seas, this proposal can be considered relevant.

INFORMATION SOURCES

1. A.S. No. 350945, B.I. No. 27, op. 11/13/72

2. A.S. No. 439601, b.i. No. 30, op. 08/15/74

3. Astafyev V.N., Surkov G.A., Truskov P.A. Hummocks and hammers of the Sea of Okhotsk. - St. Petersburg: Press Weather, 1997. - 208 p.

4. Patent of Russia No. 2153070 dated July 20, 2000. Bulletin No. 20.

5. Patent of Russia No. 2640605 dated 09/22/2015. Bulletin No. 1.

6. Taylor Ph. L. A Hot Water Drill for Temperate Ice. CRREL Special Report 84-34, 1984. p. 105-117.

Claims (1)

A device for drilling holes in ice, connected to a water thermal drill in the form of a tip, containing a hollow cone-shaped body, characterized in that a valve is coaxially located at the end of the tip, opening when there is some force against the movement of the thermal drill, and blocking the flow of water, if the force is it is absent, thereby allowing for simultaneous recording to a computer or logger of the drilling speed and water flow depending on the depth and subsequent processing of records for zero water flow xix the exit of the thermal drill tip from the ice into the cavity, which together with the data on the drilling speed gives the position of the boundaries and sizes of voids in the ice formations.