CN-121539228-B - Heavy-duty lightweight coiled tubing injection head clamping block

CN121539228BCN 121539228 BCN121539228 BCN 121539228BCN-121539228-B

Abstract

The invention discloses a heavy-duty and light-weight coiled tubing injection head clamping block, and belongs to the field of coiled tubing injection heads. The clamping block comprises a clamping seat, a clamping piece, a plunger, an anti-drop screw and an oiling plug, wherein an annular clamping space for accommodating the continuous oil pipe is formed inside the clamping seat, an M-shaped groove for placing the clamping piece is formed inside the clamping seat, and the clamping piece can move in the M-shaped groove along the radial direction. The clamping seat is internally provided with a closed isobaric communication cavity connected with the plunger hole, and plungers uniformly distributed along the circumferential direction and the axial direction of the continuous oil pipe can be subjected to hydraulic pressure with the same size as the closed isobaric communication cavity and act on the clamping piece along the axial direction of the continuous oil pipe in a common radial direction. The clamping structure disclosed by the invention ensures that the clamping load is uniformly distributed on the whole clamping surface, can realize larger clamping load on a limited clamping block area, and provides a guarantee for the lightweight design of the injection head and a technical support for the development of the continuous oil pipe operation equipment of ten thousand meters.

Inventors

YE ZHEWEI
LI CHANGJIANG
HAO JUN
YU ZHIJUN
WANG HAO
DU YUCHENG
JIANG SHAOYUN
XU YUNXI

Assignees

西南石油大学

Dates

Publication Date: 20260508
Application Date: 20260120

Claims (6)

1. A heavy-duty and light-weight coiled tubing injection head clamping block is characterized by comprising a clamping seat (1), clamping sheets (2), plungers (3), anti-drop screws (4) and an oil injection plug (5), wherein an annular clamping space for accommodating a coiled tubing (6) is formed inside the clamping seat (1), M-shaped grooves (1-12) are formed in the circumferential direction of the annular clamping space, the clamping sheets (2) are respectively embedded in groove positions on two sides of the M-shaped grooves (1-12), a plurality of plunger holes (1-1) are formed in the clamping seat (1) along the circumferential direction and the axial direction of the clamping space, the plungers (3) are respectively arranged in the corresponding plunger holes, circumferential flow passages (1-2), axial flow passages and transverse flow passages (1-3) which are mutually communicated are formed inside the clamping seat (1), the anti-drop screws (4) penetrate through stepped through holes formed in the clamping seat (1) and are connected with threaded holes formed in the clamping sheets (2), the clamping sheets (2) are arranged in the M-shaped grooves (1-1) and the vent holes (1-1), the oiling plug (5) is arranged at the positions of the oil filling hole (1-6) and the exhaust hole (1-7) in a sealing mode.
2. The heavy-duty and light-weight coiled tubing injector clamping block according to claim 1, wherein the plunger holes (1-1) are uniformly distributed along the circumferential direction of the clamping space and symmetrically arranged on both circumferential sides of the M-shaped groove (1-12), the number of the plunger holes (1-1) at both circumferential ends of the M-shaped groove (1-12) is 3-6, the number of the plunger holes (1-1) is 4-8 in the axial direction of the coiled tubing (6) on the clamping seat (1), the axes of each layer of plunger holes (1-1) intersect at the same intersection point, the intersection points of the axes of the plunger holes (1-1) of each layer of plunger holes are axially arranged along the coiled tubing to form a straight line, and the straight line coincides with the geometric central axis of the coiled tubing (6).
3. The heavy-duty and light-weight coiled tubing injector clamping block according to claim 1, wherein the circumferential flow channels (1-2) are arranged in multiple layers in the axial direction of the clamping seat, each layer of circumferential flow channel is divided into a left circumferential flow channel and a right circumferential flow channel, the number of layers of the circumferential flow channels is the same as that of plungers Kong Cengshu of the clamping seat in the axial direction, the left circumferential flow channel is communicated with a plunger hole on the left side of the layer, the right circumferential flow channel is communicated with a plunger hole on the right side of the layer, the axial flow channels comprise a first axial flow channel (1-4) and a second axial flow channel (1-5) which are arranged on two sides of the clamping seat (1), the first axial flow channel (1-4) is communicated with the right circumferential flow channel of each layer, the second axial flow channel (1-5) is communicated with the left circumferential flow channel of each layer, and the transverse flow channel (1-3) is communicated with the first axial flow channel (1-4) and the second axial flow channel (1-5).
4. The heavy-duty and light-weight coiled tubing injector clamping block according to claim 1 or 3, wherein the connecting ends of the circumferential flow channel (1-2) and the transverse flow channel (1-3) are sealed with the outside through plug welding, the top end of the first axial flow channel is provided with an exhaust hole, the top end of the second axial flow channel is provided with an oil injection hole, the clamping seat (1) is communicated with the outside only through a plunger hole (1-1), the oil injection hole (1-6) and the exhaust hole (1-7) are sealed through an oil injection plug (5) in threaded connection, and a sealing structure is arranged between the plunger (3) and the plunger hole (1-1) so as to form a closed communication cavity.
5. The heavy-duty and light-weight coiled tubing injector clamping block according to claim 1, wherein stepped through holes are formed in the upper end of the clamping seat (1) in the axial direction of the coiled tubing and staggered with the plunger hole (1-1), the through holes are distributed diagonally in the circumferential direction of the clamping seat (1) and are respectively a first through hole (1-8) and a third through hole (1-10), stepped through holes are formed in the lower end of the clamping seat (1) in the axial direction of the coiled tubing and staggered with the plunger hole (1-1), the through holes are distributed diagonally in the circumferential direction of the clamping seat (1) and are respectively a second through hole (1-9) and a fourth through hole (1-11), and a movable gap is reserved between the anti-drop screw (4) and the steps of the through holes, so that the clamping piece (2) has a movable stroke of 1-5mm in the radial direction.
6. The heavy-duty and light-weight coiled tubing injector clamping block according to claim 1, wherein a liquid medium is filled in a runner in the clamping seat (1), and no gas exists after the communicating cavity is filled, and the internal pressure range is 0.05-1MPa.

Description

Heavy-duty lightweight coiled tubing injection head clamping block Technical Field The invention belongs to the field of coiled tubing injection heads, and particularly relates to a heavy-load and light-weight coiled tubing injection head clamping block. Background Coiled tubing operation equipment is widely applied to oil and gas well drilling, well repair and production increase operations. The injection head is used as one of the most critical components in the coiled tubing operation system, plays important roles of lifting, lowering, applying weight on bit and the like of the coiled tubing, and the bearing capacity directly determines the safety of the coiled tubing operation and the applicable well depth range. To meet the lifting force requirements of the injector head, two general approaches are adopted in the prior art, namely, one is to increase the clamping force exerted on the coiled tubing by a single clamping block on the injector head, and the other is to increase the number or clamping length of the clamping blocks in the injector head. However, with the continuous increase of the number of deep wells and ultra-deep wells, the length of the continuous oil pipe for various underground operations is continuously increased, the continuous oil pipe is gradually stepped to a level of ten meters, and the load required to be borne by the injection head is obviously increased. If the bearing capacity is only improved from the angle of increasing the structural size or the number, the overall quality of the injection head is overlarge, the field installation, operation and transportation difficulties are increased, the contradiction with the development trend of light weight of coiled tubing operation equipment is also caused, meanwhile, the local overlarge stress of the coiled tubing is possibly caused by simply improving the clamping load, and the risk of crushing and crushing the coiled tubing exists. Further analyzing the structural characteristics of the existing coiled tubing clamping blocks can find that the clamping load is difficult to effectively disperse in the circumferential direction because the stress distribution of the clamping blocks and the coiled tubing in the circumferential direction is uneven, and the extrusion force between the clamping blocks and the coiled tubing is often concentrated in the smaller arc sections on two sides of the loading acting line. This circumferential uneven load clamping significantly limits the effective load carrying capacity of the clamp block. When the clamping load is relatively large, local damage and even extrusion damage of the coiled tubing are easy to cause, and when the clamping load is relatively small, the coiled tubing injection head is difficult to obtain enough axial bearing capacity, and the comprehensive requirements of the injection head on light weight and high bearing capacity under the working condition of the ten-thousand-meter-level coiled tubing are difficult to be met. Therefore, a novel clamping block structure of the injection head of the coiled tubing is needed in the industry, on the premise that the size and the number of the clamping blocks are not increased, the clamping load is uniformly distributed in the circumferential direction and the axial direction, so that the total clamping load is effectively dispersed on the whole clamping surface, the clamping blocks can be approximately uniformly clamped in a limited contact area, the total clamping bearing capacity of the unit contact area is obviously improved, and effective guarantee is provided for the heavy load and light weight design of the injection head in the operation equipment of the coiled tubing of ten thousand meters. Disclosure of Invention The invention aims to solve the technical problems that the existing injection head clamping blocks are uneven in clamping force distribution, the local load of the clamping blocks is too large and a coiled tubing is easy to damage under the limited space condition, and the like, and provides a heavy-load and light-weight coiled tubing injection head clamping block. The relative sliding between the clamping block and the continuous oil pipe is effectively avoided, the reliability and stability of the continuous oil pipe clamping operation are obviously improved, and the most direct support is provided for the heavy-load lightweight design of the continuous oil pipe injection head. The heavy-duty and light-weight coiled tubing injection head clamping block is characterized in that an annular clamping space for accommodating the coiled tubing is formed in the clamping seat, M-shaped grooves matched with the clamping pieces are formed in the circumferential direction of the annular clamping space, the clamping pieces are respectively embedded in groove positions on two sides of the M-shaped grooves, and the groove wall structure of the groove is used for guiding and limiting the clamping pieces, so that the clamping pieces