Davorin Matanović DRILLING LINE (ROPE) AND BLOCKS
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1 Davorin Matanović DRILLING LINE (ROPE) AND BLOCKS
2 DRILLING LINE (ROPE) AND BLOCKS The term drilling line pertain to the wire rope made from steel wires. It is spooled onto the drum of the draw works hoist, strung on the crown and traveling block, anchored at the one end and fastened on the other. It supports the entire drilling assembly by means of pulleystyle devices and grasping elements. They are called the overhead tools and include: crown block an arrangement of sheaves that is fixed to beams at the top of the derrick or mast; the traveling block, another sheaved device that moves up and down on the line; the hook, which is fastened to the traveling block; and the elevators, which grip the pipes when coming in or out of hole.
3 DRILLING LINE (ROPE) AND BLOCKS The purpose of the system is to give the drilling line the effect of many lines in hoisting the heavy loads required in drilling.
4 Blocks/ Sheaves A block is an assembly of large pulleys known as sheaves mounted on a common framework through which the drilling line is reeved. The function of the sheaves is to guide and support the drilling line as it passes through the blocks. The number of sheaves in block is determined by the weight to be supported.
5 Two features of sheaves are of primary concern: (1) the size or radius of groves in which the wire line runs on the sheaves, and (2) the tread diameter, the diameter of the sheave measured from groove to groove bottom; to be sure that wire rope and sheave will work together well (bending radii). Cross section of a typical sheave A gauge to measure sheave groves
6 Grove radii for new and reconditioned sheave grooves WIRE ROPE DIA., d už TOLERANCE * GROOVE ROOT RADIUS, R ** u mm (") mm (") mm (") minimum maximum 9,53 (3/8) +0,794;-0 (+1/32;-0) 5,207 (0,205) 5,461 (0,215) 11,11 (7/16) +0,794;-0 (+1/32;-0) 5,969 (0,235) 6,223 (0,245) 12,70 (1/2) +0,794;-0 (+1/32;-0) 6,731 (0,265) 6,985 (0,275) 14,29 (9/16) +0,794;-0 (+1/32;-0) 7,62 (0,300) 7,874 (0,310) 15,88 (5/8) +0,794;-0 (+1/32;-0) 8,382 (0,330) 8,636 (0,340) 19,05 (3/4) +0,794;-0 (+1/32;-0) 9,906 (0,390) 10,16 (0,400) 22,23 (7/8) +1,19;-0 (+3/64;-0) 10,312 (0,460) 12,065 (0,475) 25,40 (1) +1,19;-0 (+3/64;-0) 13,335 (0,525) 13,716 (0,540) 28,58 (1 1/8) +1,19;-0 (+3/64;-0) 14,859 (0,585) 15,240 (0,600) 31,75 (1 1/4) +1,59;-0 (+1/16;-0) 16,637 (0,655) 17,018 (0,670) 34,93 (1 3/8) +1,59;-0 (+1/16;-0) 18,288 (0,720) 18,669 (0,735) 38,1 (1 1/2) +1,59;-0 (+1/16;-0) 19,812 (0,780) 20,193 (0,795) 41,28 (1 5/8) +2,38;-0 (+3/32;-0) 21,844 (0,860) 22,225 (0,875) 44,45 (1 3/4) +2,38;-0 (+3/32;-0) 23,495 (0,925) 23,876 (0,940)
7 Crown block The crown block is an assembly of sheaves mounted on beams at the top of the derrick. Some crown blocks are equipped with extra sheaves to accommodate a sand line, and a cat line. The former is used for retrieving special tools from the hole and the letter used for hoisting heavy equipment on the rig
8 Traveling block It moves between an up and down position on the line. It carries the hook that supports the drill string when drilling and the elevator bails that hold the elevators when tripping in or out of the hole.
9 Cutaway view of a traveling block.
10 Hook The hook is a large joining device suspended from the traveling block to grasp the various pieces of equipment needed in drilling and in making trips. It rotates on bearings in its supporting housing and can be locked into as many as twelve different positions. A strong spring within it cushions the weight of the drill pipe so that tool joint threads are not damaged in making up or breaking out the pipe The hook has a safety latch for the swivel and locking arms or link ears at both sides for the elevator-bail attachments.
11 Major parts of a hook
12 A hook-block combination takes less space than the two used separately.
13 Elevators Elevators are clamps that grip a stand, or column of drill pipe, casing, tubing or sucker rods so that the stand can be raised from or lowered into the hole. They are attached to the hook by elevator links or bails.
14 Most of the drill pipe that elevators have to fit has a taper of 18 on the tool-joint shoulder where it meets the pipe. Another type of pipe is that with square shoulder (90 ) on the tool joint box.
15 Drilling line wire rope In the making of wire rope, steel wires are made into strands and the strands into rope in an action similar to braiding. Outer strands are laid spirally around a central core.
16 The spiral of strands in a wire rope either to the right or to the left when viewed from above is known as the lay of the rope. Regular lay means that the wires in each strand of the rope are twisted in a direction different from the strands themselves. Lang lay ropes have both the strand and the wires in each strand spiraling in the same direction. Right regular lay is generally referred in drilling process.
17 A common arrangement of the wire rope refers to the core and six strands that consist of various wire numbers and layers. The core is the inner support of the strands. It can be produced of fiber, plastics or it can be an independent wire rope.
18 Sand and coring line Strand consists of one central a six more wires around. It is also possible that strand consists of 12, 14, 19, 30 etc. wires. Instead of three there can also be ropes with more strands; 4, 5, 7, 8, 16 and more.
19 Seale design The number of inner wires in each strand is the same as the number of outer wires. The diameter of the inner wires is smaller than that of the outer.
20 API Spec. 9A defines the conditions for wires and ropes according to construction type. Approved constructions are: 6x7, 6x19, 6x21, 6x25, 6x26, 6x31, 6x36, 6x41, 6x46, 6x57, 6x61, 6x91, 6x103; and for special purposes: 8x19, 8x25, 18x7, 19x7; and with triangle strand construction: 6x25 type B, 6x27 type H, 6x30 type G and 6x31 type V.
21 Warrington/Seale construction (6x26) Combination of wires with different diameter in central layer enables to position wires closely. The lay of all layers is the same.
22 Filler Wire rope differs from other in that the space between wires is filled with wires of small diameter. Such wires do not contribute in calculating the metal area of the rope.
23 (6x25 style B) Triangle shaped strands enable the maximum metal area of the rope according the diameter. (6x25 style H)
24 Dimensions and characteristics, according to the rope diameter NOMINAL DIAMETER MASS OF THE UNIT LENGTH STEEL BREAKING FORCE ENHANCED STEEL EXTRA ENHANCED STEEL mm (in.) kg/m kn kn kn 13 (1/2) 0,63 83,2 95, ,5 (9/16) 0, (5/8) 0, (3/4) 1, (7/8) 1, (1) 2, (1 1/8) 3, (1 1/4) 3, (1 3/8) 4, (1 1/2) 5, (1 5/8) 6, (1 3/4) 7, (1 7/8) 8, (2) 10,
25 Measuring The often mistake is in wrong way of wire rope measuring. Possible rope position in the sheave groove
26 Typical sizes and constructions of wire rope for oil field services (API RP 9B) WELL TYPE SAND LINES AND SHALOW, INTERMEDIA AND DEEP WELLSWELLS DRILLING LINES, LARGE ROTARY RIGS, SHALLOW AND INTERMEDIA WELLS DEEP WELLS MAST RAISING LINES WIRE ROPE DIAMETER (in) mm (7/8 to 1) 22,23 to 25,4 (1 to 1 1/8) 25.4 to (1 to 1 1/8) 25.4 to (1 1/8 to 1 1/4) to 31,75 (1 1/4 to 2) 31,75 to 50,80 (1 3/8 and less) 34,93 and less (1 1/2" and greater) 38,1and greater WIRE ROPE DESCRIPTION 6x19 Seal or 6x25 FW PS or IPS, PF or NPF, RL, IWCR orfc 6x19 Seal or 6x25 FW, EIPS, PF, RL or IWRC 6x19 Seal or 6x21 FW PS or IPS, PF or NPF, RL, IWRC or FC 6x19 Seal or 6x21 FW, EIPS, PF, RL, IWRC 6x25 FW, IPS or FPS, PF, IWRC 6x37 IPS or EIPS, PF, IWRC FW filler wire construction, PS plow steel (rope wire having a breaking strength from Pa to Pa), IPS improved plow steel (rope wire having a breaking strength from Pa to Pa), EIPS extra improved plow steel (rope wire having a breaking strength from Pa to Pa), NPF non-performed, RL right lay, LL left lay, FC fiber core, IWCR independent wire rope core,
27 The wire rope is with one end attached in the clamp inside the breaking crest. Also enough dead wraps should be wind to protect the clamp.
28 Deadline anchoring system. After making a proper number of wraps, the line is threaded through the deadline anchor and fastened in clamp.
29 The most common reeving pattern is lefthand reeving with the deadline anchor located to the left of the derrick vee. The flat angle is important in preventing rope wear. It should be held to a minimum less than 1,5 degrees for grooved drums.
30 Total stress in the wire rope is: σ = σ + σ u Where: σ u total stress in the rope, Pa v σ v axial stress, Pa σ s stress due bending, Pa s Stress due the axial force is: σ v Where: = P maks. A už P maks. maximum force in the rope, N A už rope cross section area, m 2
31 Stress due bending: Coefficient of security: σ s = C Bach E δ D žsr kol σ m = d σ u Where: C Bach Bach s coefficient (due the differences in wire area); 0,375 E Young s modulus of elasticity, Pa δ žsr mean wire diameter, m D kol sheave diameter, m Where: m rope coefficient of security (for drilling ropes 3 to 5) σ d material yield point, Pa
32 Carrying or metal rope area (A už ) is the sum of all the wire areas in the rope: A už = n d 2 π 2 π ž1 ž n2 + 4 d 4... Where: n 1,2 - number of wires of same diameter d ž1,2 wire diameter, m
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