CN1407208A

CN1407208A - Modulated rotary guide offset devices

Info

Publication number: CN1407208A
Application number: CN 01127366
Authority: CN
Inventors: 孙铭新; 韩来聚; 刘新华; 冯光通
Original assignee: DRILLING TECHNOLOGY INST SHENGLI PETROLEUM ADMINISTRATION
Current assignee: DRILLING TECHNOLOGY INST SHENGLI PETROLEUM ADMINISTRATION
Priority date: 2001-08-31
Filing date: 2001-08-31
Publication date: 2003-04-02
Anticipated expiration: 2021-08-31
Also published as: CN1265073C

Abstract

A modulation-type offset tool for rotary guide of drilling petroleum well features that the hydraulic difference existed naturally in drilling well is used as the power source of whole system. A hydraulic by-pass valve is used to introduce the high-pressure drilling liquid to a hydraulic cavity of the side wings for pushing the side wings out and supporting them by well wall, so generating offset force to guide direction. Its advantages are reasonable structure and advanced principle.

Description

A kind of modulated rotary guide offset devices

The invention belongs to petroleum exploration and development rotary steerable drilling downhole tool.

Along with most of oil field in the world enters development late stage, the oil reservoir development difficulty is increasing, and special wells such as directional well, horizontal well, extended reach well, designer's well have become the main development tool that adapts to this exploitation situation demand.A job of the most critical in the construction of this class well is led to well exactly, promptly controls well and creeps into by hole deviation, the orientation of design.

The traditional direction mode is to adopt curved shell down-hole motor guide drilling tool to creep into sliding type, and there is following major defect in it: 1. hole trajectory control low precision; 2. owing to be to adopt sliding type to creep into, the drilling well extreme displacement is restricted; 3. well is not slick and sly, and mill resistance, moment of torsion are increased; 4. wellbore quality and borehole status are not good, are prone to the down-hole complex accident; 5. increased the drilling number of times, reduced rate of penetration, drilling cost is risen greatly.

For solving the hole trajectory control low precision that the traditional direction mode exists, poor hole quality, the drilling well down-hole accident is many, the drilling cost height, and creep into the restricted problem of limit well depth, to satisfy latter period of oilfield development, the steerable drilling demand of special wells such as a large amount of directional wells, horizontal well, extended reach well, designer's well, at the end of the eighties, the rotary steerable drilling technology occurs.After entering the nineties, this technology has obtained developing rapidly; The mid-90, external existing several rotary steering system test success also drops into field popularization application, and obtained good effect, as the automatic well system of rotation closed loop of Baker Hughes Inc, the rotary steerable drilling system of Schlumberger company is exactly to use two kinds of ripe rotary steerable drilling systems.But domestic instrument in this field is still blank.The present invention is exactly for satisfying a kind of modulated rotary guide offset devices that domestic rotary steerable drilling needs design.

Be rotated guiding with this instrument and compare, have the following advantages with the traditional direction mode:

1. the hole trajectory control precision is higher than the traditional direction mode;

2. creep into owing to adopting rotation mode to lead, drilling well limit well depth is improved greatly;

3. well slyness, the well that mill resistance, moment of torsion creep into far below the traditional direction mode;

4. wellbore quality and borehole status are better than the well that the traditional direction mode is crept into, and greatly reduce down-hole complex accident odds;

5. reduced the number of times that makes a trip, improved rate of penetration, drilling cost is reduced greatly.

Compare with the automatic well system of rotation closed loop of Baker Hughes Inc, the present invention has omitted complicated hydraulic system, and utilize in the drilling process drilling fluid pressure reduction that exists naturally power source as whole system, make the present invention simple in structure, power consumption reduces greatly, therefore, solved system's spontaneous heating problem, and prolonged the underground work time; Compare with the rotary steerable drilling system of Schlumberger company, structure of the present invention is simpler, reasonable, thereby has improved its functional reliability.With itself and stable controlling platform and measurement while drilling, well logging during, with boring instrument fit applications such as formation evaluation well logging, can realize the down-hole rotary steerable drilling.

The present invention is achieved in that high pressure drilling liquid passage connecting rod [15] is fixed on the interior shunting disk [22] of biasing pipe nipple body [24] by fixed bar [23] and a plurality of hold-down screw [21], by the fixing relative position of high pressure drilling liquid passage connecting rod [15] and shunting disk [22] of square fixed bar [23], be communicated with the high pressure drilling liquid passage [45] of shunting disk [22] and biasing pipe nipple body [24] inside respectively with 3 the high pressure drilling liquid passages [16] that guarantee high pressure drilling liquid passage connecting rod [15] inside, and be communicated with hydraulic cavities [18] by high pressure drilling liquid passage [45]; Following moushroom valve [10] is fixed in high pressure drilling liquid passage connecting rod [15] top by a plurality of hold-down screws [12], and following moushroom valve [10] is gone up circumferentially uniform 3 high pressure drilling fluid through-holes [31] and is communicated with 3 high pressure drilling liquid passages [16] of high pressure drilling liquid passage connecting rod [15] inside respectively; Middle moushroom valve [9] and last moushroom valve [8] are connected in down on the moushroom valve [10] by axle [13], and this connection can guarantee can relatively rotate between moushroom valve [8], middle moushroom valve [9] and the following moushroom valve [10]; Uniform 3 ribs expenditure of the exterior circumferential of circular biasing pipe nipple body [24] mechanism's placed side [43]; The support rib pedestal [41] of 3 identical rib expenditure mechanisms [17] is fixed on corresponding rib expenditure mechanism's placed side [43] by rib expenditure mechanism's pressing plate [19] and a plurality of hold-down screw [33] separately; There is piston [35] hydraulic cavities wall [34] inside of supporting on the rib pedestal [41], piston [35] by U type rubber seal ring [40] and U type rubber seal ring fixedly snap ring [44] be fixed in the inwall of hydraulic cavities wall [34], piston [35] is uniform 3 current limliting water nozzles [36] circumferentially; The hydraulic cavities wall [34] that supports on the rib pedestal [41] forms hydraulic cavities [18] jointly with piston [35], U type rubber seal ring [40], rib expenditure mechanism's placed side [43]; Expenditure piece [38] is fixed in by pivot [42] and supports on the rib pedestal [41], and combines by supporting surface combination [37] and piston [35]; Supporting surface combination [37] can guarantee to pay between piece [38] and the piston [35] and can produce relative slip, but can not separate; Expenditure piece wearing course [39] is equipped with in expenditure piece [38] outside.

Figure of description:

Fig. 1, rotary steering DHA schematic diagram

Fig. 2, modulated rotary guide offset devices schematic diagram

Fig. 3, last moushroom valve schematic diagram

Fig. 4, middle moushroom valve schematic diagram

Fig. 5, following moushroom valve schematic diagram

Fig. 6, rib expenditure structural scheme of mechanism

Description of drawings: on 1 control pipe nipple, 2 modulated rotary guide offset devices, 3 drill bits, 4 drill strings, 5 wells, the 6 annular spaces 7 biasing guiding forces 8 in the moushroom valve 9 10 times moushroom valve 11 cleaner for high-pressure drilling fluids of moushroom valve distribute 18 hydraulic cavities, 19 ribs expenditure mechanism of screw thread on 12 times moushroom valve hold-down screws of passage, 13 axles 14 (connecing the control pipe nipple) 15 cleaner for high-pressure drilling fluid passage connecting rods, 16 cleaner for high-pressure drilling fluid passages, 17 ribs expenditure mechanism pressing plate, 20 fixing screw holes, 21 hold-down screws, 22 shunting disks, 23 fixed bars, 24 biasing pipe nipple bodies

25 times screw threads (connecing drill bit), 26 stop pins

Moushroom valve high pressure drilling liquid distribution passage on the moushroom valve heart hole 28 on 27

Moushroom valve high pressure drilling liquid distributes passage 30 mid-game valve core holes in 29

31 times moushroom valve high pressure drilling fluid through-hole 32 lower wall valve core holes

33 hold-down screws, 34 hydraulic cavities walls

35 pistons, 36 current limliting water nozzles

37 supporting surfaces combination, 38 expenditure block bodies

39 expenditure piece wearing course 40U type rubber seal rings

41 support rib pedestal 42 pivots

The 43 ribs expenditure placed side 44U of mechanism type rubber seal ring is snap ring fixedly

45 high pressure drilling liquid passages

Now the present invention will be further described in conjunction with Figure of description:

The present invention is received between drill bit [3] and control pipe nipple [1], be lowered in the well [5],, make its rotation that is independent of drill string [4] and relatively stable in a certain position by the fixing position of going up moushroom valve [8] of the controlling organization in the control pipe nipple [1]; When drill string [4] rotates, in moushroom valve [9] will be in drive rotation down with the frictional force of the following moushroom valve [10] of drill string [4] rotation, stop pin [26] on last moushroom valve [8] is with its fixed-site, make high pressure drilling liquid distribute passage [28] and [29] to connect, form high pressure drilling liquid and distribute passage [11]; Rotation along with drill string [4], 3 high pressure drilling fluid through-holes [31] on the following moushroom valve [10] will distribute passage [11] to connect with high pressure drilling liquid successively, high pressure drilling liquid is imported corresponding hydraulic cavities [18] by high pressure drilling liquid passage [16], [45], and by the inflow of the current limliting water nozzle [36] on the piston [35] annular space [6], but keep certain pressure reduction; Piston [35] is extrapolated under the effect of this pressure reduction, and pay piece [38] by supporting surface combination [37] promotion and rotate around pivot [42], and finally be supported in the borehole wall of well [5], the borehole wall will produce a reaction force [7] to offset guiding tool [2], and active force is acted on the drill bit [3], thereby produce guide effect by offset guiding tool [2]; When drill string [4] continues rotation, this high pressure drilling liquid passage will cut off, descend simultaneously another high pressure drilling fluid through-hole [31] on the moushroom valve [10] to distribute passage [11] to connect with high pressure drilling liquid, high pressure drilling liquid enters corresponding another and supports the hydraulic cavities [18] of rib, repeats above-mentioned expenditure process; Because the position of last moushroom valve [8] is fixed, do not rotate with drill string [4], therefore, rotation along with drill string [4], expenditure piece [38] will be always one by on the high pressure drilling liquid of moushroom valve [8] distribute the position of passage [28] to determine direction on pay, thereby can realize controlled, continuous rotary steering.

The present invention has omitted complicated hydraulic system, and utilizes the brill that naturally exists in the drilling process The well hydraulic pressure difference makes the present invention and external existing biasing guiding as the power source of whole system Instrument is compared, have simple in structure, the characteristics that power consumption is low, therefore, solved system from Heating problem, and prolonged the underground work time; Simultaneously, structural design of the present invention simple, Rationally, reliability height. With its with stable control platform and measurement while drilling, well logging during, with Bore the instrument fit applications such as formation evaluation well logging, can realize rotary steerable drilling.

Claims

1. modulated rotary guide offset devices is characterized in that: high pressure drilling liquid passage connecting rod [15] is fixed on the shunting disk [22] in the biasing pipe nipple body [24] by fixed bar [23] and a plurality of hold-down screw [21]; Following moushroom valve [10] is fixed in high pressure drilling liquid passage connecting rod [15] top by a plurality of hold-down screws [12]; Middle moushroom valve [9] and last moushroom valve [8] are connected in down on the moushroom valve [10] by axle [13]; Circumferential uniform 3 ribs expenditure mechanism's placed side [43] of biasing pipe nipple body [24]; 3 rib expenditure mechanisms [17] are fixed on corresponding rib expenditure mechanism's placed side [43] by its rib expenditure mechanism's pressing plate [19] and a plurality of hold-down screw [33] separately;

2. a kind of modulated rotary guide offset devices according to claim 1 is characterized by: the support rib pedestal [41] of rib expenditure mechanism [17] is fixed on corresponding rib expenditure mechanism's placed side [43] by rib expenditure mechanism's pressing plate [19] and a plurality of hold-down screw [33] separately; Hydraulic cavities wall [34] inside of supporting on the rib pedestal [41] is hydraulic cavities [18], and there is piston [35] inside; Piston [35] by U type rubber seal ring [40] and U type rubber seal ring fixedly snap ring [44] be fixed in the inwall of hydraulic cavities wall [34], piston [35] is uniform 3 current limliting water nozzles [36] circumferentially; Expenditure piece [38] is fixed in by pivot [42] and supports on the rib pedestal [41], and combines by supporting surface combination [37] and piston [35]; There is expenditure piece wearing course [39] expenditure piece [38] outside.

3. a kind of modulated rotary guide offset devices according to claim 1 is characterized by: going up on the moushroom valve [8] has a stop pin [26], and last moushroom valve [8] is linked together by axle [13] with middle moushroom valve [9] and following moushroom valve [10].