WO2019147884A1 - Dispositifs de régulation de pression destinés à assurer l'étanchéité autour d'éléments tubulaires - Google Patents

Dispositifs de régulation de pression destinés à assurer l'étanchéité autour d'éléments tubulaires Download PDF

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Publication number
WO2019147884A1
WO2019147884A1 PCT/US2019/015072 US2019015072W WO2019147884A1 WO 2019147884 A1 WO2019147884 A1 WO 2019147884A1 US 2019015072 W US2019015072 W US 2019015072W WO 2019147884 A1 WO2019147884 A1 WO 2019147884A1
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WO
WIPO (PCT)
Prior art keywords
region
annular
seal
radially
extending
Prior art date
Application number
PCT/US2019/015072
Other languages
English (en)
Inventor
Christopher Dale Johnson
Ajay V. Kulkarni
Ali A. AL-QURAISHHI
Original Assignee
National Oilwell Varco, L.P.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by National Oilwell Varco, L.P. filed Critical National Oilwell Varco, L.P.
Publication of WO2019147884A1 publication Critical patent/WO2019147884A1/fr

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00—Sealing or packing boreholes or wells
    • E21B33/10—Sealing or packing boreholes or wells in the borehole
    • E21B33/12—Packers; Plugs
    • E21B33/124—Units with longitudinally-spaced plugs for isolating the intermediate space
    • E21B33/1243—Units with longitudinally-spaced plugs for isolating the intermediate space with inflatable sleeves
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00—Sealing or packing boreholes or wells
    • E21B33/02—Surface sealing or packing
    • E21B33/03—Well heads; Setting-up thereof
    • E21B33/06—Blow-out preventers, i.e. apparatus closing around a drill pipe, e.g. annular blow-out preventers
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
    • E21B19/16—Connecting or disconnecting pipe couplings or joints
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00—Sealing or packing boreholes or wells
    • E21B33/02—Surface sealing or packing
    • E21B33/08—Wipers; Oil savers
    • E21B33/085—Rotatable packing means, e.g. rotating blow-out preventers
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00—Sealing or packing boreholes or wells
    • E21B33/10—Sealing or packing boreholes or wells in the borehole
    • E21B33/12—Packers; Plugs
    • E21B33/122—Multiple string packers
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00—Sealing or packing boreholes or wells
    • E21B33/10—Sealing or packing boreholes or wells in the borehole
    • E21B33/12—Packers; Plugs
    • E21B33/127—Packers; Plugs with inflatable sleeve
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B2200/00—Special features related to earth drilling for obtaining oil, gas or water
    • E21B2200/01—Sealings characterised by their shape

Definitions

  • the present disclosure relates generally to drilling systems and to rotating control devices (RCD) for such systems. More particularly, the disclosure relates to systems and methods for providing annular seals between concentric fluid conduits as they rotate relative to each other and as one of the fluid conduits moves axially through the RCD.
  • RCD rotating control devices
  • each packing element includes a rigid annular insert having a mounting flange and a resilient annular seal element that surrounds and contacts the pipe. The packing elements allow the drill pipe to move axially into or out from a wellbore without fluid leakage.
  • Figure 1 shows a finite element analysis (FEA) plot of stress induced within a resilient, annular seal element PA2 of a conventional packing element. The plot shows stress results for regions along a cross-section; even so, the results are representative of volumetric portions of the seal element.
  • FEA finite element analysis
  • Seal element PA2 extends from a first end PA4 to a second end PA6 and includes a through-passage PA8, an annular recess PA10 extending inward from first end PA4, and a radially outermost surface PA12.
  • the FEA included boundary conditions that assume a rigid flanged, annular insert of the packing element is located along the radially outer portion of first end PA4 and within annular recess PA10.
  • Annular recess PA10 is generally cylindrical, having axially extending walls.
  • a box end 20 of a drill pipe 22 is located within a seal element PA2 with neck 24 of box end 20 axially aligned with the innermost end of recess PA10, adjacent the indentation PA11.
  • the plot represents a situation in which drill pipe 22 is being pulled upward through seal element PA2.
  • stress levels are normalized to values from 0 to 1 in multiple increments, as show on legend 30.
  • three stress levels SL1, SL2, SL3 will be considered, with each stress level representing one or more increments in legend 30.
  • a region of low stress SL1 in seal element PA2 occurs throughout a majority of seal element PA2, extending axially inward from ends PA4, PA6 and along the outermost surface PA12 and the lower and upper portions of through-passage 266.
  • a region of elevated stress SL2 occurs adjacent neck 24, adjacent recess PA10, and below recess PA10.
  • a region of highest stress SL3 extends radially between neck 24 and the innermost end of recess PA10, spanning the entire radial distance therebetween.
  • a pressure control device for sealing about a tubular string comprises: a flange disposed about a central axis, an annular extension extending from the flange and having a radially-inward facing surface; and an annular seal element coupled to the annular extension.
  • the seal member includes a through-passage for receiving the tubular string and an annular recess in which the annular extension is disposed.
  • the radially-inward facing surface comprises a tapered region that is nonlinear in an axial cross-section.
  • the radially-inward facing surface flares outwardly, away from the through-passage.
  • the radially-inward facing surface may, in some embodiments, include first and second ends wherein the second end is further from the central axis than the first end.
  • the radially-inward facing surface comprises a first region extending from the first end and a second region extending from the first region, and wherein the second region is continuously curved in an axial cross-section.
  • the second region may include a constant radius in an axial cross-section.
  • the radially-inward facing surface comprises a first region extending from the first end and a second region extending from the first region, and wherein the second region, in an axial cross-section, has a radius that has a value selected from the range 0 to 30 inches.
  • the annular seal element comprises: a seal first end adjacent the flange; a seal second end axially spaced apart from the flange; and a radially outermost surface having first and second regions, wherein the first region extends from the seal first end and the second region extends from the seal second end toward the seal first end and is frustoconical.
  • a pressure control device for sealing about a tubular string, comprising: a central axis; an annular insert; and an annular seal element coupled to the annular insert.
  • the seal element comprises: a seal first end disposed adjacent the annular insert; a seal second end axially spaced apart from the annular insert; a through-passage extending through the seal first and second ends for receiving the tubular string; and a radially outermost surface including a first region extending from the seal first end and a second region extending from the seal second end toward the first region, wherein the second region tapers as it extends in a direction away from the annular insert.
  • the second region on the annular seal element intersects the first region, and in some embodiments, the second region is frustoconical.
  • the annular insert comprises an annular flange disposed about the central axis; an annular extension extending from the flange; and a radially-inward facing surface extending along the annular extension, wherein the annular seal element includes an annular recess in which the annular extension is disposed, the annular recess extending from the seal first end.
  • the radially-inward facing surface of the annular insert includes a tapered region that expands radially outwardly as it extends axially away from the flange.
  • the radially-inward facing surface may, in some embodiments, further include a generally cylindrical region extending from the flange to the tapered region.
  • Another pressure control device for sealing about a tubular string comprises: a central axis; an annular insert, and an annular seal element.
  • the insert includes a flange disposed about the central axis, an annular extension concentric with the flange and extending from the flange, and a radially-inward facing surface extending along the annular extension.
  • the annular seal element is coupled to the annular extension.
  • the seal element includes: a seal first end disposed adjacent the flange; a seal second end axially spaced apart from the flange; a through-passage extending through the seal first and second ends for receiving the tubular string; and an annular recess in which the annular extension is disposed.
  • the seal element further includes a radially outermost surface having a first region extending from the seal first end and a second region extending from the seal second end toward the first region.
  • the radially-inward facing surface of the annular insert includes a tapered region that expands radially outwardly as it extends axially away from the flange.
  • the second region on the annular seal element intersects the first region and in some embodiments, the tapered region is continuously curved.
  • the tapered region of the annular insert may have a constant radius as viewed in a profile on an axial plane.
  • the radially-inward facing surface of the annular insert comprises: a first end coupled to the flange, a second end spaced from the first end; and a cylindrical region extending from the first end; wherein the tapered region extends from the cylindrical region toward the second end.
  • the tapered region of the radially-inward facing surface intersects the second end at a fillet; and wherein the tapered region intersects the fillet at a tangent line that is disposed at angle between 5 and 45 degrees, inclusive, with respect to the central axis.
  • Figure 1 shows a finite element analysis plot of stress induced within a conventional packing element
  • Figure 2 shows cross-sectional side view of an embodiment of a rotating control device having a pressure-responsive assembly mounted in a rotating sleeve in accordance with principles described herein;
  • Figure 3 shows a perspective view of an embodiment of a packing element configured for use in compatible with the rotating control device of Figure, the packing element having an annular insert and an annular seal element in accordance with principles described herein 1;
  • Figure 4 shows a cross-sectional view of the packing element of Figure 3;
  • Figure 5 shows a cross-sectional view of the annular insert of the packing element of
  • Figure 6 shows a cross-sectional view of another embodiment of a packing element configured for use in compatible with the rotating control device of Figure 2 in accordance with principles described herein;
  • Figure 7 shows a cross-sectional view of still another embodiment of a packing element configured for use and compatible with the rotating control device of Figure 2 in accordance with principles described herein;
  • Figure 8 shows a finite element analysis plot of an example stress-loading within the packing element of Figure 6;
  • Figure 9 shows a finite element analysis plot of an example stress-loading within the packing element of Figure 4.
  • the terms“including” and“comprising,” as well as derivations of these, are used in an open-ended fashion, and thus are to be interpreted to mean“including, but not limited to... ”
  • the term“couple” or“couples” means either an indirect or direct connection.
  • the recitation“based on” means“based at least in part on.” Therefore, if X is based on Y, then X may be based on Y and on any number of other factors.
  • the word“or” is used in an inclusive manner. For example,“A or B” means any of the following:“A” alone,“B” alone, or both“A” and“B.”
  • an axial distance refers to a distance measured along or parallel to a given axis
  • a radial distance means a distance measured perpendicular to the axis
  • any reference to a relative direction or relative position is made for purpose of clarity, with examples including “top,” “bottom,” “up,” “upper,” “upward,” “down,” “lower,” “clockwise,”“left,”“leftward,”“right,” and“right-hand.”
  • a relative direction or a relative position of an object or feature may pertain to the orientation as shown in a figure or as described. If the object or feature were viewed from another orientation or were implemented in another orientation, it may then be helpful to describe the direction or position using an alternate term.
  • the present disclosure involves sealing between a rotatable conduit and a stationary conduit to prevent fluid leakage.
  • the sealing is achieved by a packing element(s), which serves as a pressure control device and may rotate with the rotatable conduit or may remain stationary with the stationary conduit.
  • Each packing element includes an annular insert having a mounting flange and an annular seal element that surrounds and contacts the pipe. Axial movement of a drill pipe or another tubular string through the packing element may cause the annular seal element, which includes a resilient portion, to deform as it expands and contracts in response to varying outside diameter of the tubular string and its joints. Deformation causes stress in the resilient portion.
  • the packing element embodiments disclosed herein are configured to reduce stress within the seal element as a drill pipe or another tubular string slides into or through the packing element or remains sealingly coupled within the packing element.
  • a rotating control device (RCD) 100 extends along a central axis 101 and is configured to receive sealingly a tubular member, which in this example is a pipe 102.
  • Device 100 is suitable as a member of a wellhead over a borehole of a well, such as a hydrocarbon well, for controlling or isolating fluid pressures.
  • RCD 100 is a type of pressure control device.
  • Device 100 includes an outer housing 110 holding a sensor 120 and includes a rotating sleeve assembly (RSA) 125 received within housing 110.
  • RSA rotating sleeve assembly
  • Housing 110 includes a housing wall or tubular body 111 extending along the central axis 101 from a lower end 112 to an upper end 113, having an outer surface and a through- bore 114.
  • Through-bore 114 is centered on axis 101 and defines an inner wall.
  • RSA 125 extends at least partially within the through-bore 114 of housing 110.
  • RSA 125 includes a rotatable sleeve 130 received within a bearing assembly 180 to rotate about axis 101 relative to the housing 110, a speed indicator 131 received in sleeve 130 at a location along axis 101 that is aligned with sensor 120 of outer housing 110.
  • Sleeve 130 and pipe 102 when installed, are configured as a rotatable conduit, and housing 110 is configured as a stationary conduit.
  • Sensor 120 is configured to detect the periodic presence of speed indicator 131 as sleeve assembly 125 rotates relative to housing 110 and sensor 120.
  • speed indicator 131 includes a magnet
  • sensor 120 is includes Hall Effect sensor; although, various other embodiments include another type of speed indicator 13 lor another type of sensor 120.
  • Rotating sleeve 130 includes a sleeve outer surface 134 and a bore 136 extending from a lower end 132 to an upper end 133.
  • rotating sleeve 130 is formed from an upper sleeve member 140 coupled to a lower sleeve member 160 by a sleeve coupling 165.
  • a collar 168 is coupled to sleeve member 140 at upper end 133, and an upper packing element 170A extends downward from the bottom of collar 168, into member 140.
  • Collar 168 is generally tubular, being open at both ends to receive pipe 102 therethrough.
  • a lower packing element 170B extends downward from sleeve member 160 at lower end 132.
  • Each packing element 170A,B includes annular insert 172 bonded or otherwise coupled to an annular seal element 174 extending axially from insert 172. Annular inserts 172 are fastened to collar 168 and sleeve member 160, respectively.
  • the annular seal element 174 of packing element 170A,B are configured to seal around the circumference of pipe 102, isolating the bore 136 from an upper portion of collar 168 and from upper and lower portions of bore 114 in housing 110, to prevent fluid leakage from these regions.
  • these and other packing elements disclosed herein are pressure control devices.
  • the sealing configuration of packing elements 170A,B is maintained even as sleeve 130 and pipe 102 rotate relative to housing 110 during operation.
  • rotation of pipe 102 causes sleeve 130 to rotate due to the gripping action of packing elements 170A,B.
  • Collar 168, packing elements 170A,B, and bore 136 provide a sealable through- passage for a tubular member, e.g. pipe 102, to extend or pass through housing 110, which in some arrangements leads into a borehole.
  • Bore 136 is configured to be an isolated chamber when a tubular member is installed.
  • Upper sleeve member 140 includes a threaded lower end 142 attached to sleeve coupling 165 and an upper end 133 attached to collar 168.
  • Sleeve member 140 includes a radially protruding annular shoulder 146 located between ends 142, 133 and a port 148 extending into shoulder 146 along a central axis 149 coplanar with central axis 117 of port 116. Some misalignment between axis 149 and 117 is acceptable in various embodiments depending on the sensitivity of sensor 120.
  • Port 148 is configured to receive speed indicator 131 at a fixed position along port axis 149, disposing speed indicator 131 at a fixed distance from axis 101, being generally flush or adjacent to outer surface 134.
  • sensor 120 Whenever sleeve 130 rotates the indicator 131 to the circumferential position of sensor 120, the magnet of indicator 131 is at a fixed distance from sensor 120 within its detection range (e.g. a prescribed distance). Repeated movement of speed indicator 131 past sensor 120 provides a measurement of the rotational speed of sleeve 430 with respect to housing 110.
  • sensor 120 is configured as a speed sensor.
  • bearing assembly 180 includes a bearing housing 182 that is coupled within housing 110 to remain stationary, a bearing sleeve 184 coupled to sleeve 130 to grasp and rotate with sleeve 130, and bearing 186 coupled between housing 182 and sleeve 186.
  • bearing 186 includes two opposing sets of tapered roller bearings to resist axial thrust in either vertical direction from, for example, pipe 102.
  • FIG. 3 presents a packing element 200.
  • One or more packing element 200 may be installed or used as either or both packing elements 170A, 170B in RSA 125 of Figure 2 to perform as a pressure control device for sealing about a tubular string.
  • Packing element 200 includes an axis 202, an annular insert 204 centered on axis 202, and an annular, resilient seal element 205 extending from insert 204 and centered on axis 202.
  • Annular insert 204 includes a flange 206 with a plurality of fastener holes 208.
  • Seal element 205 includes a radially outermost surface 212 having a plurality of axial slots 214. Each slot 214 is circumferentially aligned with an axially extending, fastener hole 208 in flange 206 to allow a fastener to extend therein.
  • Figure 4 shows a cross-sectional view of packing element 200, the cross-sectional view formed along a geometric plane 215 that intersects central axis 202.
  • Insert 204 includes a first end 222, a second end 224 spaced apart from first end 222 along axis 202, a flange 206 disposed about axis 202 at end 222, an annular extension 226 concentric with flange 206 extending from the flange 206 to end 224, and a radially-inward facing surface 230 extending along flange 206 and annular extension 226.
  • surface 230 is nonlinear along axial plane 215.
  • Figure 5 shows a closer view of insert 204 from Figure 4. From end 222 to end 224, insert 204 has a height 232. Extension 226 has an outside diameter (OD) 233 at least at second end 224 and has an inside diameter (ID) 234 at first end 222. At first end 222, inward-facing surface 230, starting with the ID 234, extends from flange 206. Surface 230 expands and has an inner diameter at second end 224 that is greater than ID 234 at first end 222. Consequently, surface 230 is further from central axis 202 at second at end 224 than it is at the first end 222. Radially-inward facing surface 230 comprises a cylindrical region 236 (i.e. flat along plane 215, i.e.
  • distance 245 is selected from the range 0 to 90% of height 232.
  • Embodiments having a distance 245 equal to 0 inches lack a cylindrical region 236.
  • tapered region 238 is continuously curved in this embodiment, lacking any radially inward annular protrusion. Tapered region 238 intersects or joins the second end 224 at a fillet 242. In this example, with tapered region 238 shown in profile view, region 238 has a constant radius 244 on axial plane 215. In various embodiments including Figure 5, radius 244 has a value selected from the range 1/8 inch to ten times OD 233. In various embodiments, including Figure 5, radius 244 has a value selected from the range 1/8 to 30 inches. In some embodiments, radius 244 has a value selected from outside these ranges. In some embodiments, tapered region 238 has a varying radius along plane 215. In some embodiments, tapered region 238 is flat rather than curved.
  • tapered region 238 intersects the fillet 242 at a tangent line 246.
  • tangent line 246 is disposed at angle 247 having a value between 5 and 45 degrees, inclusive, with respect to central axis 202 on plane 215.
  • tangent line 246 extends circumferentially as a conical surface about axis 202.
  • annular seal element 205 includes a seal first end 262 coupled to annular extension 226 and disposed adjacent flange 206 and includes a seal second end 264 axially spaced apart from flange 206.
  • Seal element 205 further includes a through- passage 266 extending through the seal first and second ends 262, 264, an annular recess 268 extending from seal first end 262, and radially outer or outermost surface 212, which extends from first end 262 to second end 264.
  • Through-passage 266 is configured to receive a tubular member or string.
  • Annular extension 226 of insert 204 is disposed and held in annular recess 268. The resiliency of seal element 205 allows a portion of element 205 to expand and contract in response to varying outside diameter or alignment of a tubular string and its joints that may move within the through-passage 266.
  • Outermost surface 212 includes a first region 272 extending axially from the seal first end 262 at a taper angle 273 with respect to axis 202 and a second region 274 extending from the seal second end 264 toward the first region 272.
  • slots 214 extend primarily through region 272 but also region 274.
  • Region 274 becomes smaller as it extends in an axial direction from region 274 toward end 264.
  • region 274 becomes larger as it extends in an axial direction from end 264 toward region 274 and annular insert 204.
  • the second region 274 is frustoconical, extending at a taper angle 275 with respect to axis 202.
  • Region 274 intersects the first region 272 at a fillet and intersects seal second end 264 at a fillet 276.
  • outermost surface 212 includes two regions defined by their axially-extending character, i.e. regions 272, 274 located between ends 262, 264, but not a third region; wherein the fillets are considered to be portions of these regions 272, 274 and not regions in their own right.
  • Region 274 extends from region 272 to end 264 without an intervening cylindrical region.
  • taper angle 273 is equal to 2 degrees; thus, the outer extent of region 272 (radially beyond slots 214) is mildly frustoconical.
  • taper angle 273 may be zero degrees such that the outer extent of region 272 is generally cylindrical.
  • the size of the other taper angle, taper angle 275 may also vary. In various embodiments including Figure 4, taper angle 275 is selected from a value between 5 and 85 degrees, inclusive. More specifically, in Figure 4, taper angle 275 is 20 degrees.
  • Axial slot 214 extends from first seal end, along the first region 272, and into the second region 274 of surface 212. For packing element 200, the radially-inward facing surface 230 of insert 204 expands or flares outwardly, away from the through-passage 266 as surface 230 extends axially from flange 206.
  • Packing element 200 has a total height 280 from end 222 to end 264.
  • the height 282 of second region 274 of seal element 205, measured from end 264, is selected from a value in the range 10% to 75% of height 280, inclusive.
  • second region 274 is curved along axis 202 rather than being frustoconical and straight along axis 202 on plane 215.
  • Figure 6 in another embodiment, shows a cross-sectional view of packing element 300.
  • One or more packing element 300 may be installed or used as either or both packing elements 170A, 170B in RSA 125 of Figure 2 to perform as a pressure control device for sealing about a tubular string.
  • Packing element 300 includes an axis 302 located on a geometric plane 303, an annular insert 204 centered on axis 302, and an annular seal element 305 extending from insert 204 and centered on axis 302.
  • Annular insert 204 is the same as previously described with respect to Figures 3 and 4, including a radially-inward facing surface 230 extending along a flange 206 and an annular extension 226 from a first end 222 to a second end 224. As shown in the profile view of Figure 6, surface 230 is nonlinear along axial plane 215.
  • Annular seal element 305 extends from a seal first end 362 coupled to annular extension 226, adjacent flange 206 to a seal second end 364 axially spaced apart from flange 206.
  • Seal element 305 further includes a through-passage 266 extending through the seal first and second ends 362, 364, an annular recess 268 extending from seal first end 362, and a radially outermost surface 312 extending from first end 362 to second end 364, and having a plurality of axial slots 214, in surface 312.
  • Each axial slot 214 is aligned with a fastener hole 208 in flange 206. Only one pair of aligned slot 214 and hole 208 is shown in Figure 6.
  • Through-passage 266 is configured to receive a tubular member or string.
  • Annular extension 226 of insert 204 is disposed and held in annular recess 268.
  • Seal element 305 includes flexible or resilient material to expand and contract in response to varying outside diameter or alignment of a tubular string and its joints that may move within the through-passage 266.
  • Outermost surface 312 includes a first region 372 extending from the seal first end 362 at a mild taper with respect to axis 302, a tapered second region 374 extending from the first region 372, and a cylindrical, third region 376 extending from the second region 374 to the seal second end 364. Second region 374 and third region 376 intersect at an obtuse angle 377.
  • second region 374 is frustoconical, having taper angle 375 that is substantially greater than the taper of region 372, and the cylindrical, third region 376 intersects seal second end 364 at a fillet 378.
  • Taper angle 375 of second surface region 374 is 30 degrees, but angle 375 could vary in other embodiments.
  • angle 375 may have a value between 5 and 85 degrees.
  • third region 376 is mildly tapered, frustoconical with respect to central axis 302.
  • the radially- inward facing surface 230 of insert 204 expands or flares outwardly, away from the through- passage 266 as surface 230 extends axially away from flange 206.
  • Figure 7 shows a cross-sectional view of in another embodiment, a packing element 400.
  • One or more packing element 400 may be installed or used as either or both packing elements 170A, 170B in RSA 125 of Figure 2 to perform as a pressure control device for sealing about a tubular string.
  • Packing element 400 includes an axis 402 located on a geometric plane 403, an annular insert 404 centered on axis 402, and an annular seal element 205 extending from insert 404 and centered on axis 402.
  • Annular insert 404 includes a first end 422, a second end 424 spaced apart from first end 422 along axis 402, a flange 206 disposed about axis 402 at end 422, an annular extension 426 concentric with flange 206 extending from the flange 206 to end 424, and a cylindrical radially-inward facing surface 430 extending along flange 206 and annular extension 426, and a plurality of axially extending fastener holes 208.
  • the profile view of Figure 7 shows that surface 430 is linear along axial plane 215 and includes an annular protrusion 431 proximal end 424. Protrusion 431 may aid in keeping seal element 205 coupled to insert 404.
  • Annular seal element 205 is the same as previously described with respect to Figures 3, including the possible embodiments thereof.
  • seal element 205 extends from a seal first end 262 coupled to annular extension 426 adjacent flange 206 to a seal second end 264 axially spaced apart from flange 206.
  • Seal element 205 also includes a through-passage 266 to receive a tubular member or string, an annular recess 468 extending from seal first end 262, and a radially outermost surface 212, which extends from first end 262 to second end 264.
  • Annular extension 426 of insert 404 is disposed and held in annular recess 468, which is contoured to match this extension 426.
  • recess 468 is generally cylindrical and includes a radially-inward, annular indentation 469 to receive protrusion 431.
  • surface 212 includes a tapered first region 272 and a tapered second region 274 extending from region 272 to seal second end 264, and a plurality of axial slots 214.
  • Figure 8 shows an FEA plot of stress induced within a resilient, annular seal element 305 of a packing element 300 (Figure 6).
  • the plot shows stress results for regions along a cross-section; even so, the results are representative of volumetric portions of seal element 305.
  • seal element 305 extends from a first end 362 to a second end 364 and includes a through-passage 266, an annular recess 268 extending inward from first end 362, and a radially outermost surface 312.
  • the FEA includes boundary conditions that assume rigid flanged, annular insert 204 is located along the radially outer portion of first end 362 and within annular recess 268 as shown in Figure 6.
  • a box end 20 of a drill pipe 22 is located within through-passage 266 of seal element 305 with a neck 24 of box end 20 axially aligned with the innermost end of recess 268. More specifically, the plot represents a situation in which drill pipe 22 is being pulled upward through seal element 305.
  • stress levels are normalized and labeled as previously explained with respect to Figure 1..
  • a region of low stress SL1 in seal element 305 occurs throughout a majority of seal element 305.
  • a region of elevated stress SL2 occurs around the innermost end of recess 268 and neck 24.
  • Highest stress SL3 extends radially between the innermost end of recess 268 and the intersection of box end 20 and neck 24 but not spanning the entire distance therebetween, unlike the scenario of Figure 1.
  • the configuration of a packing element 300 with an annular insert 204 which includes a tapered or curved radially-inward facing surface 230 ( Figure 5) results in a smaller portion of its seal element 305 experiencing highest stress SL3 as compared to the seal element of a conventional packing element, which is analyzed in Figure 1.
  • Figure 9 shows an FEA plot of stress induced within a resilient, annular seal element 205 of a packing element 200 (Figure4).
  • the plot shows stress results for regions along a cross-section; even so, the results are representative of volumetric portions of seal element 205.
  • seal element 205 extends from a first end 262 to a second end 264 and includes a through-passage 266, an annular recess 268 extending inward from first end 262, and a radially outermost surface 212.
  • the FEA includes boundary conditions that assume a rigid flanged, annular insert of the packing element is located along the radially outer portion of first end 262 and within annular recess 268 as shown in Figure 4.
  • Annular recess 268 is cylindrical, having axially extending walls.
  • a box end 20 of a drill pipe 22 is located within a seal element 205 with neck 24 of box end 20 axially aligned with the innermost end of recess 268.
  • the plot represents a situation in which drill pipe 22 is being pulled upward through seal element 205.
  • stress levels are normalized and labeled as previously explained with respect to Figure 1.
  • a region of low stress SL1 in seal element 205 occurs throughout a majority of seal element 205.
  • a region of elevated stress SL2 occurs around the innermost end of recess 268 and neck 24.
  • a region of highest stress SL3 extends radially inward from recess 268 and radially inward from the through-passage 266, but spanning only a relatively small portion of the entire distance therebetween, unlike the scenario of Figure 1.
  • the size of the regions of the seal element in Figure 9 that experience the highest stress SL3 and the regions that experience elevated stress SL2 are both reduced as compared to the seal element of a conventional packing element analyzed in Figure 1, and as compared to packing element 300 analyzed in Figure 8.
  • packing element 200 includes an annular insert 204 having a tapered or curved radially-inward facing surface 230 ( Figure 5) and also includes a seal element 205 having a radially outermost surface 212, and this configuration is understood to be a reason that seal element 205 is subjected to lower stress when a box end 20 is in seal element 205 as compared to stress experience by a seal element of a conventional packing element and as compared to some other packing element embodiments disclosed herein.
  • Some embodiments of packing elements in accordance with principles described herein include an annular seal element having an outer surface region defined by a single axially-extending character, such as being entirely frustoconical or entirely cylindrical, as examples. Some of these embodiments include slots 214.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Mechanical Engineering (AREA)
  • Gasket Seals (AREA)

Abstract

L'invention concerne un dispositif de régulation de pression (100) destiné à assurer l'étanchéité autour d'une colonne tubulaire (102), le dispositif comprenant : une bride (206) disposée autour d'un axe central, une extension annulaire (226) s'étendant à partir de la bride et un élément d'étanchéité annulaire (305) accouplé à l'extension annulaire. L'élément d'étanchéité comprend un passage traversant (266) destiné à recevoir la colonne tubulaire et un évidement annulaire (268) dans lequel est disposée l'extension annulaire (226). L'extension annulaire comprend une surface orientée radialement vers l'intérieur (230) qui comprend une région conique (238) qui est non linéaire dans une section transversale axiale afin de réduire les contraintes mécaniques dans l'élément d'étanchéité.
PCT/US2019/015072 2018-01-26 2019-01-25 Dispositifs de régulation de pression destinés à assurer l'étanchéité autour d'éléments tubulaires WO2019147884A1 (fr)

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US201862622428P 2018-01-26 2018-01-26
US62/622,428 2018-01-26

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019213162A1 (fr) * 2018-05-02 2019-11-07 Ameriforge Group Inc. Dispositif de commande tournant amélioré pour plate-formes terrestres
CN112600141B (zh) * 2020-12-04 2022-06-28 李莉 一种建筑电气管道用的围绕式密封装置

Citations (5)

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US2124015A (en) * 1935-11-19 1938-07-19 Hydril Co Packing head
US2846247A (en) * 1953-11-23 1958-08-05 Guiberson Corp Drilling head
US3029083A (en) * 1958-02-04 1962-04-10 Shaffer Tool Works Seal for drilling heads and the like
CN106050182A (zh) * 2016-06-27 2016-10-26 阜宁县石油机械有限公司 一种增强型同步旋转防喷器
WO2017152190A1 (fr) * 2016-03-04 2017-09-08 National Oilwell Varco, L.P. Systèmes et procédés de régulation de débit d'un espace annulaire de puits de forage

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US4529210A (en) * 1983-04-01 1985-07-16 Biffle Morris S Drilling media injection for rotating blowout preventors
US4486025A (en) * 1984-03-05 1984-12-04 Washington Rotating Control Heads, Inc. Stripper packer
US4754820A (en) * 1986-06-18 1988-07-05 Drilex Systems, Inc. Drilling head with bayonet coupling
US7836946B2 (en) * 2002-10-31 2010-11-23 Weatherford/Lamb, Inc. Rotating control head radial seal protection and leak detection systems
US7198098B2 (en) * 2004-04-22 2007-04-03 Williams John R Mechanical connection system
US7926593B2 (en) * 2004-11-23 2011-04-19 Weatherford/Lamb, Inc. Rotating control device docking station
US7699109B2 (en) * 2006-11-06 2010-04-20 Smith International Rotating control device apparatus and method
US7798250B2 (en) * 2007-08-27 2010-09-21 Theresa J. Williams, legal representative Bearing assembly inner barrel and well drilling equipment comprising same
US7635034B2 (en) * 2007-08-27 2009-12-22 Theresa J. Williams, legal representative Spring load seal assembly and well drilling equipment comprising same
US7717168B2 (en) * 2008-04-15 2010-05-18 Theresa J. Williams, legal representative Reinforced stripper rubber body and method of making same
US8347983B2 (en) * 2009-07-31 2013-01-08 Weatherford/Lamb, Inc. Drilling with a high pressure rotating control device
US8905150B1 (en) * 2011-08-22 2014-12-09 Pruitt Tool & Supply Co. Casing stripper attachment

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Publication number Priority date Publication date Assignee Title
US2124015A (en) * 1935-11-19 1938-07-19 Hydril Co Packing head
US2846247A (en) * 1953-11-23 1958-08-05 Guiberson Corp Drilling head
US3029083A (en) * 1958-02-04 1962-04-10 Shaffer Tool Works Seal for drilling heads and the like
WO2017152190A1 (fr) * 2016-03-04 2017-09-08 National Oilwell Varco, L.P. Systèmes et procédés de régulation de débit d'un espace annulaire de puits de forage
CN106050182A (zh) * 2016-06-27 2016-10-26 阜宁县石油机械有限公司 一种增强型同步旋转防喷器

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