WO2014056409A1

WO2014056409A1 - Method of continuously raising and lowering oilfield shaft drillstring and twin travelling slips apparatus

Info

Publication number: WO2014056409A1
Application number: PCT/CN2013/084585
Authority: WO
Inventors: 胡勇; 王志义; 林志忠; 魏立艳
Original assignee: 松原市前进石油工程机械有限公司
Priority date: 2012-10-10
Filing date: 2013-09-29
Publication date: 2014-04-17
Also published as: CA2887564C; US20150267484A1; CA2887564A1; CN102839928A; CN102839928B

Abstract

Disclosed is a method of continuously raising and lowering an oilfield shaft drillstring using a twin travelling slips apparatus, wherein two sets of travelling slip mechanisms form the two travelling slips apparatus, the first set of travelling slip mechanisms and the second set of travelling slip mechanisms are respectively mounted on a pithead apparatus (10) to constitute a continuous raising and lowering system. In the process of raising and lowering an oilshaft drillstring, the slips (1, 4) of each set of travelling slip mechanisms alternately clamp or release the drillstring, ensuring a continuous raising and lowering motion for the drillstring (9) from beginning to end under the clamping of the slips, and achieving uninterrupted operation. Further disclosed is a twin travelling slips apparatus. Since a twin travelling slips apparatus is used, the problem of an empty run produced by a conventional single travelling slip apparatus is overcome, eliminating, when raising and lowering the drillstring, the stoppage and waiting time of the drillstring in an empty run when the slip raises or lowers the hydraulic cylinder piston rod.

Description

Description: An oil field mine pipe string continuous lifting method and double swimming slip device technology field:

The invention discloses a method for continuous lifting of oil and gas mine pipe string, which relates to a method for starting and lowering a pipe string from a well in a well repairing and drilling pressure working construction or other operation of an oil field oil well, a gas well, a water injection well, At the same time, a double swimming slip device suitable for the method of the invention is provided, which belongs to the technical field of petroleum mine machinery.

Background technique:

In the field of oilfield machinery technology, the existing pressurized working devices are fixed clamps and swimming slips (referred to as: single swimming slips) alternately clamped the column, by the swimming slip lift The cylinder piston rod drives the reciprocating movement of the swimming slip to realize the function of lifting and lowering the column. When the pipe string is taken out, the upper stroke of the piston rod of the swimming slip lifting cylinder is the working stroke, and the lower stroke is the empty stroke; when the tubular string is lowered, the lower stroke of the piston rod of the swimming slip lifting cylinder is the working stroke, The stroke is empty stroke, the working efficiency is less than 50%, and the power consumption (for reactive power loss) is also increased. The conventional method is to increase the movement speed of the idle stroke to reduce the movement time of the idle stroke, but there is no real solution for the idle travel belt. The waste of power and time comes.

Summary of the invention:

The invention discloses a method for continuous lifting of oil and gas mine pipe string, which solves the loss of power and time caused by the idle stroke of the system during the operation of the conventional mine pipe string, and improves the starting efficiency of the mine pipe string.

The invention still further provides a double swimming slip device, which realizes the above method for starting the mine pipe string.

The invention discloses an oil field mine pipe string continuous lifting method, and the technical solution thereof is as follows:

The two sets of swimming slips constitute a double swimming slip device, wherein the first set of swimming slip mechanisms and the second set of moving slip mechanisms are respectively installed on the wellhead device to form a continuous lifting system, ie double The swimming slip device; in the process of the oil mine pipe string, the slips of each group of the sliding slip mechanism alternately clamp or loosen the pipe string, ensuring that the pipe string is always continuous under the clamping of the slip Start the movement and achieve uninterrupted construction work.

Regardless of the first or second group, the piston rod stroke of the slip lift cylinder, the cylinder mounting distance, the diameter of the cylinder and the piston rod, and their mechanical properties are all the same or equal.

The double swimming slip device provided by the invention is composed of two sets of swimming slip mechanisms, and the first slip, the first upper cross member, the first slip lift cylinder (2) and the first lower support beam constitute the first a set of swimming slip mechanism, the first slip is mounted on the first upper cross beam, and the first upper cross member and the piston rod of the first slip lift cylinder (2) are connected to form a door frame take-off and landing mechanism, first 2 kava lift cylinders are fixed on the short connection of the wellhead device by the first lower support beam; the second slip, The second upper beam, the second slip lifting cylinder (2), and the second lower supporting beam constitute a second group of moving slip mechanisms, the second slip is mounted on the second upper beam, the second upper beam and the second The piston rods of the two kava lift cylinders (2) are connected to form a door frame take-off and landing mechanism, and the second slip lift cylinders (2) are fixed to the short connection of the wellhead device by the second lower support beam; The center of the kava inner hole passing through the first slip and the inner hole of the second slip of the kava is inserted into the wellhead device; the first set of the movable slip mechanism and the second set of the movable slip mechanism constitute the door frame a square-shaped three-dimensional structure with intersecting spaces; the first slip lifting cylinder (2) of the first group of moving slip mechanisms can also be located in the second slip lifting cylinder of the second group of moving slip mechanisms (2) On the outside, a short-circuit connection with the wellhead device forms a three-dimensional structure in parallel with the portal frame on the same plane as the axis of the column and the slipper cylinder.

The two double swimming slip devices described above are characterized in that: the inner holes of the first slip and the second slip are inner closed cylinders, inner cones, inner prisms or inner pyramids, and the like, and several closed geometries. .

The first set of swimming slip mechanisms and the second swimming slip mechanism may also constitute a square solid structure in which the door frame space is parallel. The first lower support beam and the second lower support beam are fixed to the shorting of the wellhead device. The double swimming slip device is characterized in that: one side of the inner side of the first slip and the second slip is an open shape, and the opening width should be larger than the diameter of the column.

In the present invention, the slip is mounted in the middle of the upper cross member, and the two ends of the upper cross member are rigidly connected to the two piston rods of the slip lifting cylinder. The lower support beam secures the slip lift cylinder to the rigid support of the wellhead assembly or base to ensure its ability to lift and lower. The slips, the upper beam and the respective two slip lift cylinders form a portal frame take-off and landing mechanism, and the two slip lift cylinders are symmetrically distributed along the center line of the clamped tubular string and stand perpendicularly to the wellhead plane.

The positive effects of the present invention are:

Due to the use of the double-swimming slip device, the problem of the idle travel caused by the conventional single-swimming slip device is overcome, and when the lower pipe string is removed, the pipe string stops and waits when the piston rod of the slip-lift cylinder is in an empty stroke. time. If the short-term alternate time of the clamping and loosening action of the slip is neglected, it can be considered that during the construction, whether the pipe string is taken out from the well or the pipe string is lowered into the well, the lifting movement of the pipe string is continuous. So the efficiency is nearly doubled. The idle travel time of one slip is used in the work stroke of another slip, and the idle travel of the two slips does not occupy the time alone. So double the working time and double the efficiency.

DRAWINGS

Figure 1. Schematic diagram of the three-dimensional structure of the device of the present invention (the square structure of the cross-section of the closed frame and the space of the door frame); Figure 2 is a plan view of the device of the present invention (the square structure of the cross-section of the closed frame and the space of the door frame) FIG. 3 is a structural schematic diagram of the device of the present invention (a closed structure of a closed frame and a space of a door frame); FIG. 4 is a schematic view of the device of the present invention (a closed square, a frame-shaped frame parallel to the square) Schematic diagram of the structure of the structure; FIG. 5 is a schematic plan view of the structure of the device of the present invention (the square-shaped structure of the tile-opening type and the door-frame-frame parallel); FIG. 6. The device of the invention (the closed type of the tile and the frame of the door type are juxtaposed) The three-dimensional structure) structural schematic diagram; in the figure, 1, the first slip; 2, the first upper beam; 3, the first slip lift cylinder; 4, the second slip; 5, the second upper beam; , the second kava lift cylinder; 7, the first lower support beam; 8, the second lower support beam; 9, the pipe column; 10, the wellhead device; 11, short circuit; 12, the first kava 1 kava body Hole; 13, second kava 4 kava body Hole.

detailed description

Example 1

According to FIG. 1, FIG. 3, FIG. 4 and FIG. 6, the double swimming slip device of the present invention mainly comprises a first slip 1, a first upper cross member 2, and a first slip lift cylinder 3 (two). The first lower support beam 7 constitutes a first group of moving slip mechanisms, the first slip 1 is mounted on the first upper cross member 2, the first upper cross member 2 and the first slip lift cylinder 3 (two) The piston rod fixed connection constitutes a portal frame take-off and landing mechanism, and the first slip lift cylinders 3 (2) are fixed on the short joint 11 of the wellhead device 10 through the first lower support beam 7; similarly, the second slip 4 The second upper beam 5, the second slip lifting cylinder 6 (2), the second lower supporting beam 8 constitute a second group of moving slip mechanisms, and the second slip 4 is mounted on the second upper beam 5 Upper, the piston rods of the second upper beam 5 and the second slip lifting cylinder 6 (2) are connected to form a door frame take-off and landing mechanism, and the second slip lifting cylinder 6 (2) passes through the second lower supporting beam 8 is fixed on the shorting 11 of the wellhead device 10; Embodiment 2

Referring to FIG. 1 , FIG. 2 and FIG. 3 , the first group of swimming slip mechanisms in the first embodiment are arranged in a three-dimensional cross arrangement on the second group of moving slip mechanisms; that is, the first slip lifting cylinder 3 (2) The gantry frame take-off and landing mechanism and the second shovel lifting cylinder 6 (two) are arranged to cross each other; the first slip 1 is located at the upper end of the second slip 4 The first lower support beam 7 is located at the upper end of the second lower support beam 8 and is fixed to the short joint 11 of the wellhead device 10, respectively. The column 9 passes through the center of the kava holes 12, 13 of the first slip 1 and the second slip 4 and is inserted into the wellhead device 10.

Example 3

Referring to FIG. 4 and FIG. 5, the first group of movable slip mechanism door frame space in the first embodiment is parallel to the second group of moving slip mechanism door frame in a square structure; that is, the first slip lift cylinder 3 (2) are distributed in parallel with the second slip lifting cylinder 6 (2); the first slip 1 holds the column 9, and the second slip 4 is in the loosening of the column 9 and retracts to the idle stroke position. The first lower support beam 7 and the second lower support beam 8 are respectively fixed to the short joints 11 of the wellhead device 10.

Example 4

Referring to FIG. 4 and FIG. 5, the inner body hole 12 of the first slip 1 and the inner hole 13 of the second slip 4 of the embodiment 3 are open shapes with one end open, and the opening width should be larger than the tube. The diameter of the column 9 facilitates the entry and exit of the column 9 into the first slip 1 and the second slip 4.

Example 5

Referring to Figure 6, the first set of moving slip mechanism door frame described in Embodiment 1 is installed side by side with the second set of moving slip mechanism door frames; that is, the first slip lift cylinder 3 (2) is located An outer side of the second slip lifting cylinders 6 (2) of the second set of moving slip mechanisms, and parallel to each other; the first slips 1 are located on the upper ends of the second slips 4 respectively on the column 9; The first lower support beam 7 and the second lower support beam 8 are respectively connected to the short joint 11 of the wellhead device 10, and constitute a three-dimensional structure in which the central axis of the portal frame is on the same straight line.

Example 6

Embodiment 2 The inner hole 12, 13 of the first slip 1 and the second slip 4 described in the embodiment 5 is a closed geometry such as an inner cylinder, an inner cone, an inner prism or an inner pyramid.

The motion states of the devices described in Embodiments 1 and 2 are as follows:

(1) Lifting the column operation: At the beginning of the operation, the first slips 1 and the second slips 4 are located at the lower limit positions of the piston strokes of the respective slip lift cylinders. First, the first slip 1 holds the column, and the second slip 4 is in the open state. The first slip 1 holds the pipe string up to the upper limit position of the piston stroke of the first slip lift cylinder 3, and the pipe preparation operation is completed.

Starting the first slip 1 , the second slip 4 of the opposite movement: the second slip 4 after clamping the column, the first slip 1 is quickly opened. Then the second slip 4 clamps the pipe string to the middle position of the full stroke of the piston rod of the second slip lift cylinder 6 while the first slip 1 descends to the middle of the full stroke of the piston rod of the first slip lift cylinder 3 Position, empty stroke reset (with the same speed of the cylinder rod extension and retraction).

Then, the opposite movements of the first slip 1 and the second slip 4 are performed: After the first slip 1 grips the tubular string, the second slip 4 is quickly opened. Then the first slip 1 is clamped up to the upper limit position of the full stroke of the piston rod of the first slip lift cylinder 3, and the second slip 4 is descended to the second stroke of the second slip lift cylinder 6 Lower limit position, empty stroke reset. In the same period of time, under the driving of the piston rods of the respective slip lifting cylinders, the first watt 1 and the second slip 4 respectively complete "one stroke", and similarly, then enter the next "one stroke" cycle. .

The lifting movement of the tubular string is alternately performed by the cycle of the lifting movement of the first slip 1 and the second slip 4 and the lifting movement of the opposite movement period, respectively.

The idle stroke of the downward movement when the first slip 1 is opened is compensated by the second slip 4 holding the tubular string for the upward working stroke. When the second slip 4 is opened, the downward movement is an empty stroke, and the first slip 1 is clamped up by the upward working stroke of the tubular string to make up. If the switching time of the clamping and opening of the slip is ignored, it can be considered that the lifting of the string is continuous. Moreover, the pipe string is always clamped by a slip during the movement, and the corresponding slipper cylinder piston rod is in the upward movement, that is, the working stroke. At the same time, the other slip is in the open state, and the corresponding kicker cylinder rod is in the return reset - that is, the idle stroke. The empty stroke of each slip does not take up the time alone, but is compensated by the working stroke of another slip. Because the two slips are clamped and then opened alternately, the column is always clamped and raised. status. Therefore, the movement of the column is not waiting and stopping, and it is continuous without interruption.

The entire tubular string in the well is taken out of the well with the movement of the piston rods of the respective slip lift cylinders under the orderly control of the first slips 1 and the second slips 4.

(2) Pipe string entry operation:

At the beginning of the pipe string entry operation, the first slip 1 and the second slip 4 are located at the lower limit positions of the respective slip lift cylinders. First, the second slip 4 holds the column, and the first slip 1 is in an open state. The first slip 1 goes up to the upper limit position of the first slip lift cylinder 3 stroke, and the pipe string is ready for the lowering operation.

The relative movement of the first slip 1 and the second slip 4 is started. After the first slip 1 holds the column, the second slip 4 Speed on. Then the first slip 1 is clamped down to the middle position of the full stroke of the piston rod of the first slip lift cylinder 3, and the second slip 4 is advanced to the middle of the full stroke of the piston of the second slip lift cylinder 6 Position (the extension and retraction of the piston rod of the Kava lift cylinder is at constant speed). Then, the first slip and the second slip 4 are moved back. After the second slip 4 holds the column, the first slip 1 is quickly opened. The second slip 4 holds the pipe string down to the limit position of the second stroke of the second slip bearing cylinder 6 at the full stroke, and the first slip 1 is up to the upper limit of the full stroke of the piston rod of the first slipping cylinder 3 Position, empty stroke reset. For the same reason, then proceed to the next "one stroke" cycle.

The entire string is driven into the well with the movement of the piston rods of the respective slip lift cylinders under the orderly control of the first slips 1 and the second slips 4. The form of movement is the same as when it was taken out. The piston rod stroke utilization of these two types of slip lift cylinders is 50%.

The working state of the embodiment 3 and the embodiment 4 is as follows:

As shown in Fig. 4 and Fig. 5, the first group of swimming slips and the second set of swimming slips are not only moved vertically under the driving of the slip lifting cylinder, but also horizontally moved. The action of the kava advance clamping and releasing is realized, and since the working position can be withdrawn, the two sets of swimming slip mechanisms can not interfere with each other and block. Since the slips of the first slips 1 and the second slips 4 are formed in an open shape, the slips can be gripped and released from the advancement, and the optimal position of the two sets of the slip mechanisms is the first slips. The first upper cross member 2 and the second slip 4 and the second upper cross member 5 are mounted in the same plane, and the gantry frame take-off and lowering mechanisms are parallel to each other (see Figs. 4 and 5). It can be seen that the movement patterns of the first slips 1 and the second slips 4 in the same period of time are as follows: the upper and lower movement trajectories are parallel to each other and parallel to the axis of the clamped column 9, from above, The lower limit position starts to move in opposite directions, and after the space meets the point, the back movement is opposite, but the movement direction of each slip is always unchanged, and there is no inflection point before reaching the upper and lower limit positions. Their movements do not interfere with each other and block. When clamping, the axis of the column 9 is taken as the center line, and the working stroke is performed. When it is loosened, it exits, and the air line is reset away from the center line of the column 9 . In the "one stroke", the working stroke and the idle stroke of the first group of swimming slip mechanisms and the second group of moving slip mechanisms are alternately cycled to complete the continuous lifting or lowering of the tubular string 9. The piston rod stroke utilization rate of the kava lift cylinder of this structure is 100%.

Claims

claims

1. A method for continuously raising and lowering pipe strings in oilfield mines, which consists of two groups of swimming slip mechanisms to form a double swimming slip device, in which the first group of swimming slip mechanisms and the second group of swimming slip mechanisms are installed respectively A continuous lifting system is formed on the wellhead device; during the lifting process of the pipe string in oil fields and mines, the slips of each group of traveling slip mechanisms alternately clamp or loosen the pipe string to ensure that the pipe string is always stuck. It can move up and down continuously under the clamping of tiles to achieve uninterrupted construction operations.

2. A double swimming slip device, characterized by: consisting of two groups of swimming slip mechanisms, the first slip, the first upper beam, the two first slip lifting cylinders, and the first lower support beam. The first group of swimming slip mechanisms is formed. The first slip is installed on the first upper beam. The first upper beam is connected with the piston rod of the first slip lifting cylinder to form a portal frame lifting mechanism. The first slip is The lifting cylinder is fixed on the short-circuit of the wellhead device through the first lower support beam; the second slip, the second upper beam, the two second slip lifting cylinders, and the second lower support beam form the second set of floating clamps. The second slip is mounted on the second upper beam. The second upper beam is connected to the piston rod of the second slip lifting cylinder to form a portal frame lifting mechanism. The second slip lifting cylinder passes through the second lower beam. The support beam is fixed on the short connection of the wellhead device.

3. The double movable slip device according to claim 2, characterized in that: the first group of movable slip mechanisms and the second group of movable slip mechanisms form a square three-dimensional structure with a door-shaped frame spatially intersecting; The first slip lifting cylinder of the first group of swimming slip mechanisms is located outside the second slip lifting cylinder of the second group of swimming slip mechanisms. The axis is on the same plane through a short-circuit connection with the wellhead device. The three-dimensional structure of door-shaped frames is juxtaposed; the pipe string passes through the center of the hole in the slip body of the first slip and the second slip and is inserted into the wellhead device.

4. The double-swimming slip device according to claim 3, characterized in that: the holes in the slip bodies of the first slip and the second slip are closed geometric shapes such as inner cylinder, inner cone, inner prism or inner pyramid. .

5. The double movable slip device described in claim 2, characterized in that: the first group of movable slip mechanisms and the second group of movable slip mechanisms form a square three-dimensional structure parallel to the portal frame space.

6. The double swimming slip device described in claim 3, characterized in that: one side of the hole in the slip body of the first slip and the second slip has an opening shape, and the opening width is greater than the diameter of the pipe string.