CN2416225Y

CN2416225Y - Shock absorber for hydraulic tandem drilling tool

Info

Publication number: CN2416225Y
Application number: CN 00204918
Authority: CN
Inventors: 张文华
Original assignee: Institute Of Drilling And Producing Engineeringof Dagang Oil Field Group
Current assignee: Institute Of Drilling And Producing Engineeringof Dagang Oil Field Group
Priority date: 2000-03-03
Filing date: 2000-03-03
Publication date: 2001-01-24
Anticipated expiration: 2010-03-03

Abstract

The utility model relates to a hydraulic serial shock absorber for a drilling tool for a special underground tool of well drilling in an oil field, which is mainly composed of a piston body 3, an aerial drainage nozzle 4, an annular piston 5, a bearing body 6, an inner hexagonal barrel, an outer hexagonal, etc., wherein the aerial drainage nozzle 4 is connected with a cylinder barrel 2 through screw threads in the radial direction; the annular piston 5 is externally connected with the cylinder barrel 2 through a drill rod buckle; the bearing body 6 is connected with the outer hexagonal barrel 8 through screw threads, and the outer part of the bearing body 6 is connected with the cylinder barrel 2 through a drill rod buckle. The utility model enables a drill bit to work under the condition of stable ballast; thus, the purposes of protecting the drill bit and the drilling tool and improving mechanical drilling speed are achieved. A hydraulic serial piston can adopt multistage connection according to requirements in the site operation of well drilling.

Description

The tandem of surging drilling tool shock absorber

The utility model relates to oil drilling tool, is a kind of tandem drilling tool shock absorber that surges that is used for the special-purpose downhole tool of oil drilling.

Shock absorber plays an important role to protection drill bit, drilling tool and raising rate of penetration.What generally use in oilfield drilling at present is spring damper and fluid pressure type shock absorber, spring damper relies on the elastic deformation of spring to absorb the vibrational energy of drilling tool, its stiffness factor changes and difference with form of springs, and fatigue failure easily takes place in the use, and on-the-spot compliance is not strong.Hydraulic buffer relies on the elastic deformation of compressible silicone oil and damping effect to absorb vibrational energy, because the high solid phase in the drilling fluid medium that drilling process uses can cause the sealing of hydraulic buffer easily to be lost efficacy, in addition because compressible silicone oil cost height causes the hydraulic buffer use cost to increase.

The purpose of this utility model is to overcome the deficiencies in the prior art, and provides a kind of regular circulation drilling fluid that utilizes to be damping medium, can weaken the drilling tool axial vibrations, and cost is low, the tandem drilling tool shock absorber that surges that can multistage connection.

The purpose of this utility model is achieved in that

By top connection 1, cylinder barrel 2, piston body 3, earial drainage mouth 4, annular piston 5, supporting mass 6, interior six sides cover 7, the tandem drilling tool shock absorber that surges that outer six square tubes 8 are formed, cylinder barrel 2 is connected with top connection 1 by the drilling rod screw thread, piston body 3 cooperates with cylinder barrel 2, earial drainage mouth 4 radially is connected on the cylinder barrel 2 by screw thread, annular piston 5 externally is connected with cylinder barrel 2 by the drilling rod button, cooperate with piston body 3 by sealing in inside, supporting mass 6 is connected with outer six square tubes 8 by screw thread, in six sides overlap 7 and cooperate with outer six square tubes 8 by interior six sides in inside, outside and cylinder barrel 2 link by drilling rod and connect, and six sides overlapped in 7 in outer six square tubes 8 were installed by supporting mass 6.

The utility model has the advantages that, use tandem drilling tool shock absorber in drilling process, is working media with the drilling fluid, can effectively weaken the drilling tool axial vibrations, improve rate of penetration, and cost is low.

The utility model accompanying drawing 1 is the tandem drilling tool damper structure schematic diagram that surges.

Further specify the utility model below in conjunction with accompanying drawing 1.

Top connection 1, cylinder barrel 2, piston body 3, earial drainage mouth 4, annular piston 5, supporting mass 6, interior six sides cover 7, outer six square tubes 8.

Connect to form the tandem piston that surges by piston body 3, annular piston 5, earial drainage mouth 4, piston body 3 is under the effect of bit nozzle pressure drop, generation is along the downward ballast of axis direction, annular piston 5 and piston body 3 are connected to form the one-level tandem piston that surges, link to each other with annular space by earial drainage mouth 4, form low-pressure channel, interior six sides cover 7 tops link to each other with cylinder barrel 2 by drilling rod, and inside links to each other with outer six square tubes 8 by hexagonal structure.The whole series surge the series connection shock absorber be connected with anterior drilling tool by outer six square tubes 8, be connected with the rear portion drilling assembly by top connection 1.

In drilling engineering, under the effect of bit nozzle pressure drop, outer six square tubes 8 will produce downward axial ballast (being the pressure of the drill), when this ballast when creeping into the pressure of the drill or drill bit shaft to oscillating load, outer six square tubes 8 will upwards move in interior six sides cover 7 chambeies, until contacting with the first order tandem piston that surges, this moment, downward axial ballast promptly increased the surge axial ballast of tandem piston of the first order, when this two parts ballast still can not satisfy when creeping into the pressure of the drill or axial vibration load, outer six square tubes 8 and first order piston move on continuing, touch second level piston, the rest may be inferred, till making axial ballast satisfy working condition requirement.Requirement during according to on-the-spot wellbore construction, the tandem of surging shock absorber can with cylinder barrel 2 with surge that piston is multistage is connected for serial connection, to satisfy the vibration-damping function under the different loads condition.

Claims

1, the tandem of surging drilling tool shock absorber, by top connection (1), cylinder barrel (2), piston body (3), earial drainage mouth (4), annular piston (5), supporting mass (6), interior six sides covers (7), outer six square tubes (8) are formed, it is characterized in that: cylinder barrel (2) is connected with top connection (1) by the drilling rod screw thread, piston body (3) cooperates with cylinder barrel (2), earial drainage mouth (4) radially is connected on the cylinder barrel (2) by screw thread, annular piston (5) externally is connected with cylinder barrel (2) by the drilling rod button, cooperate with piston body (3) by sealing in inside, supporting mass (6) is connected with outer six square tubes (8) by screw thread, interior six sides covers (7) cooperate with outer six square tubes (8) by interior six sides in inside, outside linking by drilling rod with cylinder barrel (2) connects, and outer six square tubes (8) are installed in the interior six sides covers (7) by supporting mass (6).

2, the tandem drilling tool shock absorber that surges according to claim 1 is characterized in that: the one-level that is connected to form by piston body (3), annular piston (5), earial drainage mouth (4) tandem piston that surges can carry out the multistage use that is connected with cylinder barrel (2).