SU746074A1 - Floating drilling - Google Patents

Description

(54) FLOAT DRILLING INSTALLATION

The invention relates to offshore floating drilling rigs, in particular to devices for compensating the movement of the crown block during a vertical motion of a drilling vessel during drilling. A floating drilling rig is known, which contains a bridge, a crown block with an axis and a guide system, a compensation body and a pneumohydroaccumulum. The known installation possesses that non. " it is sufficient that, from rolling, the movement of the crown of the block vertically in the head leads to considerable effort, which reduces the sensitivity of compensation resulting from the uneven loading of the cylinders. The buoyant bob borer is known, which contains a tower, a crown block with an axis and a sprung system, compensatory hydrosilander, bypass rollers and levers C2J. The disadvantage of the known installation is the lack of reliability of compensation of the vertical roll. The purpose of the invention is to improve the reliability of compensation for vertical heave, due to the stabilization of loading on the hook. This target is achieved by the fact that the guide system is made in the form of two rocker arms mounted on the crown block axis whose ends are pivotally connected to levers that are pivotally connected to the tower, circumferential rollers and compensatory hygroscopic cylinders located in height relative to each other’s distance at a distance the distance from the center of the arms to the axis of the legs is determined by the formula. where B is the distance from the center of the levers to the tower axis, mm; and - lever arm length, mm; j ". stroke length compensation vertical pitching, mm. FIG. 1 is a general view of a stirring compensator for a crown block floating installation 3746; FIG. 2 - section aa of FIG. 1; in fig. 3 - view B of FIG. 1; FIG. 4, view B of FIG. one; in fig. 5 - kinematic. the compensator circuit, which explains the mathematical equation of the lemniscate, which describes the trajectory, the point of suspension of the cronblock axis; in fig. b - mathematical curve by niskaty, the vertical section of the curtain describes the point of suspension of the cronblock's axis; in fig. 7 is a graph of the parameters of the lever system of the compensator with a stroke of 5.5 m. Depending on the maximum deviation X of the trajectory of the crown block axis relative to the vertical axis above. The floating rig installation includes a 1fon-block 1 transfer system, consisting of an integrated hydraulic cycling system 2, well described on the elements of the tower 3. Rods 4 hydraulic cylinders 2 shyrf. They are connected to the upper arms 5 and the arms 6 by them. One upper arm 5 levers are pivotally supported on the 7, fixed on tower 5, and on the second end of the levers 5 the hinge are suspended by a romysl 8. In the center of the rocker arms 8, the crown arm axis 9 is installed 1, on which the 1O blocks are planted. The ends of the lower arms 6 are attached to the lower ends of the rockers S V uiapHHpKo, the second ends of which are pivotally supported on bearings 11, mounted on tower 3 with opposite to the vertical axis of the leading side from the arms B, - -. , Givrotsishry ry 2 can be installed in such a way that their rods will work - extension, Hydrocylinic 2 can be installed to the top 5 or bottom 6 levers .--. . - Khodov 3.2 and nepodvizhnaya 13 branches of the tackle saitaTa about blocks 10 of the crownblock 1 prop5 tseoy through the streams obvoigk zolikov 14 and 15, pivotally mounted on the axles of the upper lever 5 and further to the drilling winch 16 and the place of the spot: nd fixed end 17 , The upper arms 5 saChzana in the general frame with crossbars 18, and the levers 6 in the general frame with crossbars 19, and the beams 8 connected into the general frame with crossbars 2O, in order to stiffen the compensation system of the compensator, which is especially important when the ship’s 6yjjOBOBO rolling, - - Working cavities of hydrocylains 2 pipelines 21 from the vacuum accumulator 22 and the control system 4-4 23. For a relatively large volume of gas in the cylinders of the pneumohydroaccumulator 22, the pressure of the working fluid in the stump & m, the accumulator 22, and, respectively, in the working cavities of the overcapsule hydroshin / rOB 2, maintained practically constant, regardless of the position of the rod, whether it is removed or completely removed: moved. The specific value of the working pressure, B, depending on the size of the working load on the hook of the traveling block, is controlled by the control system 23. The third suspension point of the crown block axis is determined by the following equation LemicaTbi:. -C X. () - (il The exact value of ordinate Y, yo (Ugvet), the resulting abscissa X is determined by the formula Y V4 «ws; 4 () -c / (g) de y, jp R COSJ3 for the segment of the branch of the lemnisc 23 ordinates at X Y (4 Designations in the form of 1st ax (1) (2) (3) and (4) and in Fig. 5, 6 and 7 the following:, X - current coordinate of the suspension point axis 9 of cronblock 1 on the x-axis; Y "the current coordinate of the point of suspension of axis 9 of cronblock 1 on the ordinate axis r is the current distance to the point of suspension of axis 9 of the kronblock 1 from the mathematical center of lemniscats (mid-way compensation N); .., .. ij - rar mustache upper 5 and lower 6 ry; chygov, - - ;; /, I Ё distance from axis 9. crownblock 1 to extreme joints of rocker arms 8; 2Ё - distance between centers of extreme hinges of bald head 8; C - distance from origin of coordinates to motionless lever arms 5 and 6; 2C is the distance between the centers of the fixed hinges of the levers 5 and 6, A is the distance from the origin of coordinates to the center of the obi of the fixed hinge of the levers 5 and 6 vertically; 2A is the distance between the centers of the fixed hinges of the levers 5 and 6 along verticals; . B is the distance from the origin of coordinates (tower) to the center of the fixed joint of the levers 5 and 6 horizontally;

57460746

2B - the distance between the centers by the action of waves, while drilling the mech joints of the levers 5 and 6 is burned, there is a change in the load on the umbrellas, a hook of the pulley system and, accordingly,

0, is the angle of inclination of the connecting line on the axis 9 of the crown block 1. Next, change

fixed hinges of levers 5 and 6, securing the load, is transmitted through

with the tower to the horizontal;

- auxiliary angle, defined by the formula QIC COS. . , N is the length of the stroke to compensate for the vertical pitching of the drilling Q-force from the commanded hip shaft) cylinder. To ensure that the crownblock's axis is moving along the path of the trapline, The lemniscate in the fi ce-element mechanism exhibited consoles, the dependence of the distance 2B, the center of the fixed hinges of the levers 5 and 6 horizontally on the compensation stroke H and the radius P of the levers S w 6 is determined by the formula

Parameters B, P and lever syc- of the compensator theme, depending on the required accuracy of the vertical relocation of the axis 9 of the crown block 1, are compensated for by the course of compensation, for example, H 550 O, according to the schedule (Fig. 7).

- -Compensator structurally be banged with the axle 9 of the crown block cut across two parts 1. In this case, an additional two or one unified suspension is installed in the center between the two bridges that connect the axis of the movable hinge of the upper arms 5 to the crown block 9 axles one.

This design option allows halving the maximum bending moment acting on the axis 9 of the crown block 1 and thereby reducing the diameter of the 9 axis. KoMneHcaTqp can be made with the lower tap of the running and fixed branches of the pulley rope from 1 of the block 1 through the bypass rollers 14 and 15 located on the extreme hinges of the lower ports 6. The compensator operates as follows. When moving the drill bit, along with tower 3, up or down

of the control system on the rods 4 of the compensation GISCH) PROCESS 2.

When the drilling vessel with the derrick 3 is moving downward, a part of the weight of the drill string is transferred to the bit and the load on the hook of the pulley system, and, consequently, on the rods 4, decreases. The process of gas expansion in the pneumohydroaccumulator, and in the final itTore, and equalization of the load on the hook of the hardening system H on the drill bit at the bottom of the well occurs.

35

formula of invention

Floating drill installation, containing a tower, a crown block with an axis and a guide system, compensating hydraulic cylinders, bypass rollers and levers, characterized in that, in order to increase the reliability of compensation for vertical roll by stabilizing the load on the hook on the hook, the guide system is completed in the form of two installed on the axis of the crown block. the rocker arms whose ends are pivotally connected to the levers, such that when moving the drilling vessel with pin 3 upwards, part of the load from the drill bit is relieved, and the load on the hook of the pulley system and, accordingly, on the rod 4, increases. Consequently, the pressure increases in the working cavity of the hygrocylinders 2, as a result, the working fluid through the pipeline 21 flows into the pneumohivirumulator 22. In this way, the stem 4. and hence the „g of the crown block 1 goes down, restoring (compensating) its original position relative to the bottom reservoir. The load on the hook of the traveling block and on the drill bit at the same time also recovers & lits to its original value. pivotally connected to the tower bypass rollers and compensatory hygrocylinders | located at a height relative to each other of the fugue at a distance of the length of the rocker arm, the distance from the center of the range being determined by. . , in-1 / k () p / L-a f n

B — distance from the center of the levers to the tower axis, mm;

l - the length of the lever arm, mm. H - the length of the stroke compensation vertical pitching, MMv

746074

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Information sources, . taken into account in the examination

1. US patent number 3511476, CL. 254-139, with a pub. 1970.

2.US Patent NO. 3791628

cl. 254-182, published. 1974 (prototype).

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Claims (1)

Claim A floating drilling rig containing a derrick, a crown block with an axis and a guiding system, compensation hydraulic cylinders, bypass rollers and levers, characterized in that, in order to increase the reliability of vertical pitch compensation by stabilizing the load on the hook, the guiding system is made in the form of two installed on the axis of the crown block, the rocker arms, the ends of which are pivotally connected to the levers, which are pivotally connected to the tower by the bypass rollers and compensation hyphocylinders ₍ located in height relative to the fugue of the fugue on the distance of the length of the beam, and the distance from the center of the levers to the axis of the tower is determined by the formula: a-z / ffy • V: '746074 where B is the distance from the center of the levers to the axis of the tower, mm;