RU2367765C2 - Drilling tool for drilling oil and gas wells in seas and oceans - Google Patents

Abstract

FIELD: oil-and-gas production.

SUBSTANCE: invention relates to a drilling tool for drilling oil and gas wells in seas and oceans, and more specifically to drill pipes. The drilling tool for drilling oil and gas wells in seas and oceans has drill pipes, at the ends of which there are threads. Vessels are attached on the outer side of the drill pipe, with an external pipe of diametre 100-700 mm with stopper plugs and filled with nitrogen gas or inert gas at 0.0001-188.4 MPa pressure. The vessels can be fitted in the top or bottom parts of the drill pipe, or in the top and bottom parts of the drill pipe, or in the top, middle and bottom parts of the drill pipe. The vessels lie along each drill pipe at a distance of 0.5-8 m.

EFFECT: safe operation of the drilling machine due to reduced load on the components of the drilling machine, arising from the weight of the drill column.

4 dwg

Description

Drilling tools belong to the field of oil and gas industry, namely to drilling tools.

From the sources of SU 662701 (class E21B 43/00, published May 15, 1979, p. 2), a well pumping unit is known that contains a pump, a tubing string, a string of booms and expansion joints made in the form of nozzles forming with a string The tubing of the chamber, while the chamber during operation can be filled with gas. Moreover, the compensators are installed coaxially relative to the tubing in order to increase the reliability of work by reducing the amplitude of the loads on the rod string and reducing the overall weight of the string.

From US 3981357 A (CL E21B 7/12, publ. 09/21/1979, p. 5) it is known to make cylinders having an outer pipe (35) and filled with gas, and the cylinders can be of various shapes (see page 4 column 1 line 25-23).

From SU 781486 (class F16L 59/06, publ. 11/23/1980, p. 2) it is known to carry out a pipeline with vacuum insulation for pumping liquids and gas of the pipe-in-pipe type, where an external pipe (pipe) is installed on the pipe, forming thereby, the annular space, which is filled with a substance in a gaseous state, and the ends of the outer pipe are plugged with a plug for sealing the annular space.

The prior art also known methods of facilitating pipe columns by installing on their outer surface buoyancy elements (cylinders) (see, for example, US patent 4059148, CL. E21B 7/12, page 13).

From US 7008141 B2 (class E21B 17/01, publ. 03/07/2006, total page 11) it is known the implementation of cylinders that are filled with gas in order to facilitate the pipe string.

A well-known drilling tool with upset pipe ends on which a conical external and internal thread is cut (see Johansen K.V. Sputnik drillers. - M .: Nedra, 1981, 199 S.).

The disadvantages of the drilling tool are:

- when lowering the string of drill and casing pipes to the bottom of the sea and into the well to a depth of 5000-15000 m, the own weight of the pipes exceeds the tensile strength of steel, and consequently, the destruction of pipes and threads in the connecting nodes occurs, and when the string of drill and casing pipes is installed at the bottom wells there is a loss of stability and their destruction;

- the load on the hook, cable, winch and internal combustion engine increases when raising and lowering the drill pipe string and during drilling.

The technical result of the drilling tool is to ensure the safe operation of the drilling rig during the drilling of gas and oil wells. Drilling tool for drilling gas and oil wells in the waters of the seas and oceans, containing a drill pipe, at the ends of which a thread is cut, characterized in that cylinders containing an outer pipe with a diameter of 100-700 mm and plugs filled are installed on the outside of the drill pipe for example, with nitrogen gas or an inert gas under a pressure of 0.0001-188.4 MPa, the cylinders are located in the upper or lower parts of the drill pipe, or in the upper and lower parts of the drill pipe, or in the upper, middle and lower parts of the drill pipe to or cylinders 1-3 are located along the length of each drill pipe at a distance of 0.5-8 m.

The drawing shows a General view of a drilling tool for drilling gas and oil wells in the water spaces of the seas and oceans.

On the outside of the drill pipe 1, cylinders 2 are installed, containing an outer pipe 3 with a diameter of 100-450 mm and plugs 4.5, filled, for example, with nitrogen gas or inert gas under a pressure of 0.0001-136.2 MPa, the cylinders are located in the upper ( figure 1, a) or the lower (figure 1, b) parts of the drill pipe, or in the upper and lower (figure 1, c) parts of the drill pipe, or in the upper, middle and lower (figure 1, d) parts drill pipe, or cylinders 1-5 are located along the length of each drill pipe at a distance of 0.5-8 m

The minimum diameter of the outer pipe 3 of the cylinder 2, equal to 100 mm in the well, is determined by the standard diameters of the drill pipes 42-169 mm, and the maximum - 450 mm is determined by the standard size of the bits equal to 76-508 mm. The largest diameter equal to 700 mm of the outer pipe of the cylinder located above the wellhead in the sea water is determined by the weight of the drill pipe string, which depends on the depth of the sea bottom and the depth of the well and the size of the cavity in which the rotor of the drilling rig is located, for free descent into the well and lifting drill string with cylinders to the surface of the platform.

The maximum gas pressure in the cylinders depends on the allowable gas and water pressure on standard drill pipes (for example, for a drill pipe of strength M 73 mm in diameter with a wall thickness of 11 mm, the allowable compressive gas and water pressure on the pipes is 188.4 MPa, and the minimum gas pressure in cylinders depends on the depth of immersion of the drill pipe in water).

The distance between the cylinders is determined by the standard length of the drill pipe 6.8-11.5 m

Drilling tool works as follows.

Before starting drilling, a drill pipe string is assembled with cylinders (see Fig. 1, a, b, c, d) filled with gas under pressure, and a rock cutting tool, such as a cone, and lowered to the bottom of the sea, and a drilling rig mounted on a floating the platform, the process of drilling the well begins (in the drawing, the drill pipe string, roller cutter and drill rig installed on the floating platform are not shown). Drilling of a well with a large cone diameter of 508 mm continues to hard rock.

After that, a casing string without cylinders to the bottom of the well and with cylinders to the bottom of the sea is lowered into the drilled well.

Drilling in solid rocks continues with a smaller diameter of the cone with drill pipes with cylinders to the gas and oil layer of the rock.

The use of drill pipes with gas filled cylinders under pressure allows reducing the load on the connection nodes due to the gravity of the drill pipes, the hook, cable, winch and internal combustion engine, eliminating their breakage and buckling of the drill pipe string, and ensuring the safe operation of the drill rig in well drilling process.

Claims (1)

Drilling tool for drilling gas and oil wells in the waters of the seas and oceans, containing drill pipes, the ends of which are threaded, characterized in that cylinders containing an outer pipe with a diameter of 100-700 mm and plugs filled are installed on the outside of the drill pipe for example, with nitrogen gas or an inert gas under a pressure of 0.0001-188.4 MPa, the cylinders are located in the upper or lower parts of the drill pipe, or in the upper and lower parts of the drill pipe, or in the upper, middle and lower parts of the drill Pipes or cylinders arranged along the length of each drill pipe at a distance of 0.5-8 m.

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