阅读说明：本技术 适用于煤矿井下连续油管拖动压裂的连续油管作业机 (Coiled tubing operation machine suitable for dragging and fracturing coiled tubing under coal mine ) 是由 程斌 范耀 刘磊 庞涛 杨建超 李浩哲 于 2019-09-27 设计创作，主要内容包括：一种适用于煤矿井下连续油管拖动压裂的连续油管作业机,包括井口四通、连续油管防喷组件、注入头、导向鹅颈、连续油管、连续油管排管器、滚筒以及升降支架,井口四通设置于煤壁的井口处,所述连续油管防喷组件至少包含连续油管防喷盒,连续油管防喷组件与注入头相连,注入头后连接有一导向鹅颈,另一导向鹅颈安装在连续油管排管器上,所述滚筒可旋转的设置于滚筒支架,所述连续油管排管器安装于滚筒支架；由此,本发明适用于连续油管平行地面拖动的要求,缩短了连续油管滚筒到井口的距离,使之更适用于井下狭小空间；该作业机各部件均配有液压升降平台,可随作业要求调整高度,避免人工搬运,安全便捷,且能精确控制设备摆放高度。(The coiled tubing operation machine comprises a wellhead four-way, a coiled tubing blowout prevention assembly, an injection head, a guide gooseneck, a coiled tubing pipe arranger, a roller and a lifting support, wherein the wellhead four-way is arranged at a wellhead of a coal wall, the coiled tubing blowout prevention assembly at least comprises a coiled tubing blowout prevention box, the coiled tubing blowout prevention assembly is connected with the injection head, the rear part of the injection head is connected with the guide gooseneck, the other guide gooseneck is arranged on the coiled tubing pipe arranger, the roller is rotatably arranged on the roller support, and the coiled tubing pipe arranger is arranged on the roller support; therefore, the coiled tubing tractor is suitable for the requirement that the coiled tubing is dragged parallel to the ground, and the distance from the coiled tubing roller to a wellhead is shortened, so that the coiled tubing tractor is more suitable for narrow underground space; all parts of the operation machine are provided with the hydraulic lifting platform, the height can be adjusted along with operation requirements, manual carrying is avoided, safety and convenience are achieved, and the placement height of the equipment can be accurately controlled.)

1. The utility model provides a coiled tubing operation machine suitable for colliery is coiled tubing in pit drags fracture, includes well head cross, coiled tubing prevents spouting subassembly, injector, direction gooseneck, coiled tubing pipe rack ware, cylinder and lifting support, its characterized in that:

the wellhead four-way is arranged at a wellhead of a coal wall, a lower flange of the wellhead four-way is connected with a sleeve and is communicated to the wellhead, an upper flange of the wellhead four-way is connected with a coiled tubing blowout prevention assembly, flanges at two sides of the wellhead four-way are respectively connected with a first valve gate and a second valve gate, the coiled tubing blowout prevention assembly at least comprises a coiled tubing blowout prevention box, the coiled tubing blowout prevention assembly is connected with an injection head, a guide gooseneck is connected to the rear of the injection head, the other guide gooseneck is arranged on a coiled tubing pipe racking device, the roller is rotatably arranged on a roller support, the coiled tubing racking device is arranged on the roller support, the coiled tubing is wound on the roller and extends into the coiled tubing racking device, the two guide goosenecks, the injection head, the coiled tubing blowout prevention assembly and the wellhead four-way, and the.

2. The coiled tubing machine suitable for coal mine downhole coiled tubing drag fracturing as recited in claim 1, wherein: the coiled tubing blowout preventer assembly also includes a coiled tubing blowout preventer.

3. The coiled tubing machine suitable for coal mine downhole coiled tubing drag fracturing as recited in claim 1, wherein: the injection head is internally provided with a clamp holder, and the injection end is provided with a herringbone guide rail which is matched with the herringbone guide rail for guiding the gooseneck.

4. The coiled tubing machine suitable for coal mine downhole coiled tubing drag fracturing as recited in claim 1, wherein: the lifting support comprises a lifting platform, a hydraulic support and a base, the lower end of the hydraulic support is arranged on the base, the upper end of the hydraulic support is connected to the lifting platform, stretching and retracting of the hydraulic support are achieved to be in an open state and a closed state, and a support mounting seat is further arranged above the lifting platform to effectively support and fix a component to be supported.

5. The coiled tubing unit suitable for coal mine downhole coiled tubing drag fracturing as recited in claim 4, wherein: the lower extreme of base still is equipped with a plurality of gyro wheels so that remove and fix a position, the both sides of base still are equipped with the earth anchor support that supplies the earth anchor to run through.

6. The coiled tubing machine suitable for coal mine downhole coiled tubing drag fracturing as recited in claim 1, wherein: the guide gooseneck comprises a herringbone guide rail framework, the herringbone guide rail framework comprises two guide rails which extend outwards and are bent inwards, and the curvature radius of each guide rail is the minimum safe bending radius of the continuous oil pipe.

7. The coiled tubing machine suitable for coal mine downhole coiled tubing drag fracturing as recited in claim 1, wherein: the wellhead four-way and coiled tubing blowout prevention assembly plays a role in sealing a wellhead, the first gate valve is connected with the water pump to control annular liquid injection, and the second gate valve is connected with the solid-liquid separation device to control annular liquid discharge.

Technical Field

The invention relates to the technical field of coal mine safety, in particular to a coiled tubing operation machine suitable for dragging and fracturing a coiled tubing in a coal mine.

Background

The coiled tubing is made of low-carbon alloy steel, has good flexibility, can replace a conventional tubing or a drill rod to carry out various operations, and the coiled tubing operation equipment has the characteristics of operation under pressure and continuous lifting, and has small volume, quick operation period and low cost. The coiled tubing machine is movable, hydraulically driven coiled tubing tripping and transporting equipment, and has the basic functions of tripping a coiled tubing string in a well during coiled tubing operation, tripping out the coiled tubing after the operation and winding the coiled tubing on a roller for transportation. During operation, the coiled tubing wound on the roller is pushed down into the well through the injection head, and construction operation is completed. The coiled tubing machine is suitable for various stages of well repair, well cementation, well drilling and oil extraction, and is known as an universal machine.

The coiled tubing has good application prospect in the underground coal mine, and is the leading research direction of coal mine gas control if the coiled tubing is used for dragging and fracturing. However, the underground condition of the coal mine is greatly different from the ground condition, so that the existing coiled tubing unit cannot be directly applied. If the underground space is small, the traditional vertical gooseneck guider is difficult to transport underground, and meanwhile, when the coiled tubing is wound on the edge of the roller, a large angle is formed between the coiled tubing and the injection direction of the coiled tubing, so that the coiled tubing is easy to damage; the underground drilling of the coal mine is generally arranged on a coal wall or a rock wall, when coiled tubing operation is carried out in the drilling, the dragging direction of the coiled tubing is parallel to the ground, the coiled tubing operation machine needs to carry out transverse operation, and the conventional injection head has overlarge volume and cannot carry out transverse operation; coiled tubing operation equipment is heavy, and underground transport is difficult, is difficult to rely on manpower to assemble simultaneously etc..

Therefore, in view of the defects, through careful research and design, the designer of the invention researches and designs a coiled tubing operation machine suitable for dragging and fracturing a coiled tubing under a coal mine by combining experience and results of related industries for a long time, so as to overcome the defects.

Disclosure of Invention

The invention aims to provide a coiled tubing operation machine suitable for dragging fracturing of a coiled tubing under a coal mine, which has a simple structure and is convenient to operate, compared with the prior art, the operation machine has a smaller volume and is suitable for the requirement that the coiled tubing is dragged in parallel to the ground, and the distance from a coiled tubing roller to a wellhead is shortened by adopting a novel gooseneck guider, so that the operation machine is more suitable for narrow underground spaces; all parts of the operation machine are provided with the hydraulic lifting platform, the height can be adjusted along with operation requirements, manual carrying is avoided, safety and convenience are achieved, and the placement height of the equipment can be accurately controlled. The invention solves the problem that the coiled tubing operation machine is not suitable for the coiled tubing operation in the underground coal mine.

In order to achieve the purpose, the invention discloses a coiled tubing operation machine suitable for dragging and fracturing a coiled tubing under a coal mine, which comprises a wellhead four-way joint, a coiled tubing blowout prevention assembly, an injection head, a guide gooseneck, a coiled tubing pipe arranger, a roller and a lifting support, and is characterized in that:

the wellhead four-way is arranged at a wellhead of a coal wall, a lower flange of the wellhead four-way is connected with a sleeve and is communicated to the wellhead, an upper flange of the wellhead four-way is connected with a coiled tubing blowout prevention assembly, flanges at two sides of the wellhead four-way are respectively connected with a first valve gate and a second valve gate, the coiled tubing blowout prevention assembly at least comprises a coiled tubing blowout prevention box, the coiled tubing blowout prevention assembly is connected with an injection head, a guide gooseneck is connected to the rear of the injection head, the other guide gooseneck is arranged on a coiled tubing pipe racking device, the roller is rotatably arranged on a roller support, the coiled tubing racking device is arranged on the roller support, the coiled tubing is wound on the roller and extends into the coiled tubing racking device, the two guide goosenecks, the injection head, the coiled tubing blowout prevention assembly and the wellhead four-way, and the.

Wherein: the coiled tubing blowout preventer assembly also includes a coiled tubing blowout preventer.

Wherein: the injection head is internally provided with a clamp holder, and the injection end is provided with a herringbone guide rail which is matched with the herringbone guide rail for guiding the gooseneck.

Wherein: the lifting support comprises a lifting platform, a hydraulic support and a base, the lower end of the hydraulic support is arranged on the base, the upper end of the hydraulic support is connected to the lifting platform, stretching and retracting of the hydraulic support are achieved to be in an open state and a closed state, and a support mounting seat is further arranged above the lifting platform to effectively support and fix a component to be supported.

Wherein: the lower extreme of base still is equipped with a plurality of gyro wheels so that remove and fix a position, the both sides of base still are equipped with the earth anchor support that supplies the earth anchor to run through.

Wherein: the guide gooseneck comprises a herringbone guide rail framework, the herringbone guide rail framework comprises two guide rails which extend outwards and are bent inwards, and the curvature radius of each guide rail is the minimum safe bending radius of the continuous oil pipe.

Wherein: the wellhead four-way and coiled tubing blowout prevention assembly plays a role in sealing a wellhead, the first gate valve is connected with the water pump to control annular liquid injection, and the second gate valve is connected with the solid-liquid separation device to control annular liquid discharge.

According to the above content, the coiled tubing operation machine suitable for dragging and fracturing the coiled tubing under the coal mine has the following effects:

(1) the coiled tubing operation machine can be used for dragging the coiled tubing under pressure in the coal mine;

(2) the invention has small volume and is suitable for underground transportation and operation of coal mines;

(3) aiming at the special operation requirements of the underground coal mine, a novel guide gooseneck is designed, the safe curvature radius of the coiled tubing is utilized to the maximum extent, and the coiled tubing is prevented from being bent and damaged while the space is saved;

(4) the height of each part of the device can be adjusted according to the operation requirement, so that the device is labor-saving, safe, convenient and fast, and the accurate control of the device placement height is realized.

The details of the present invention can be obtained from the following description and the attached drawings.

Drawings

Fig. 1 shows a schematic structural diagram of a coiled tubing operation machine suitable for dragging and fracturing a coiled tubing under a coal mine.

Fig. 2A is a schematic view showing an opened state of a link mechanism of a hydraulic support in the lifting support of the present invention.

Fig. 2B shows a schematic view of the closed state of the hydraulic support linkage mechanism in the lifting support of the present invention.

Figure 3 shows a side view of the present invention.

Reference numerals:

1, coal wall; 2, sleeving a sleeve; 3, well head four-way; 3-1 a first gate valve; 3-2 second gate valves; 4, a coiled tubing blowout prevention assembly; 5 an injection head; 5-1 clamp holder; 6, guiding the gooseneck; 7, a continuous oil pipe; 8, a coiled tubing pipe arranging device; 9, a roller; 10 supporting the mounting part; 11 lifting the platform; 12 a hydraulic support; 13 a base; 14 rollers; 15, anchoring the ground; 16 ground.

Detailed Description

Referring to fig. 1 to 3, a coiled tubing unit suitable for dragging and fracturing a coiled tubing under a coal mine is shown.

Referring to fig. 1 in particular, the coiled tubing operation machine suitable for dragging and fracturing a coiled tubing under a coal mine comprises a wellhead cross 3, a coiled tubing blowout preventer 4, an injection head 5, a guide gooseneck 6, a coiled tubing 7, a coiled tubing pipe racking device 8, a roller 9 and a lifting support, wherein the wellhead cross 3 is arranged at a wellhead of a coal wall 1, a lower flange of the wellhead cross 3 is connected with a sleeve 2 so as to be communicated with the wellhead, an upper flange of the wellhead cross is connected with the coiled tubing blowout preventer 4, flanges on two sides of the wellhead cross 3 are respectively connected with a first valve gate 3-1 and a second valve gate 3-2, the coiled tubing blowout preventer 4 at least comprises a coiled tubing blowout preventer box and can also comprise a coiled tubing blowout preventer, the coiled tubing blowout preventer can be omitted under the condition that the coal bed gas pressure is small, the coiled tubing assembly 4 is connected with the injection head 5, and a guide gooseneck 6 is connected, another direction gooseneck is installed on coiled tubing pipe hanger 8, the rotatable setting in roll bracket of cylinder 9, coiled tubing pipe hanger 8 is installed in roll bracket, and coiled tubing 7 twines on roll 9 and stretches into along coiled tubing pipe hanger 8, two direction goosenecks 6, injector head 5, coiled tubing prevent spouting subassembly 4 and well head cross 3, wherein, coiled tubing prevents spouting subassembly 4, injector head 5 and direction gooseneck 6 below can be equipped with lifting support.

Wherein, a clamp 5-1 is arranged in the injection head 5.

Wherein, referring to fig. 2A and 2B, the lifting bracket comprises a lifting platform 11, a hydraulic bracket 12 and a base 13, the lower end of the hydraulic bracket 12 is arranged on the base 13, the upper end of the hydraulic bracket 12 is connected to the lifting platform 11, the opening and closing states of fig. 2A and 2B are realized by the extension and contraction of the hydraulic bracket 12, a support mounting seat 10 can be further arranged above the lifting platform 11 to effectively support and fix the member to be supported, a plurality of rollers 14 are further arranged at the lower end of the base to facilitate the movement and positioning, ground anchor brackets for the ground anchors 15 to penetrate through can be further arranged at the two sides of the base, and after the base is moved to a predetermined position, the ground anchors 15 at the two sides can be inserted into the ground 16 to realize the stable support of the whole lifting bracket.

One difficulty of using coiled tubing downhole is that the space is narrow, and when the coiled tubing pig 8 runs to the two sides of the drum, the coiled tubing is easy to bend due to a large included angle with the coiled tubing injection head 5 on the central axis. In order to overcome the difficulty, the two guide goosenecks 6 of the invention are specially designed, the guide goosenecks 6 comprise a herringbone guide rail framework (as shown in figure 1), the herringbone guide rail framework comprises two guide rails which extend outwards and are bent inwards, and the curvature radius of each guide rail is the minimum safe bending radius of the coiled tubing, so that the coiled tubing can always enter and exit the guide goosenecks 6 along the tangent lines of the guide rails at the two sides no matter the coiled tubing pipe arranger 8 runs to any position, the coiled tubing can be effectively protected from bending failure, and the problem that the coiled tubing is easy to bend when the coiled tubing is output from the two sides of the roller is effectively solved.

According to the invention, the wellhead four-way 3 and the coiled tubing blowout prevention assembly 4 can play a role in sealing a wellhead, during operation, the first gate valve 3-1 is connected with a water pump and can control annular liquid injection, the second gate valve 3-2 is connected with a solid-liquid separation device and can control annular liquid discharge, and the injection head 5 provides thrust or pull force for the coiled tubing 7 to realize dragging of the coiled tubing 7; the coiled tubing blowout prevention box in the coiled tubing blowout prevention assembly 4 can realize annular sealing, and when fracturing and other operations requiring high annular pressure bearing are carried out, or when the target coal seam gas pressure is high and there is a outburst danger, the coiled tubing blowout preventer is required to realize static sealing; when an accident happens and the well needs to be closed urgently, the coiled tubing blowout preventer is required to cut off the coiled tubing and seal the drilled hole.

When the continuous oil pipe operation machine works, all parts of the continuous oil pipe operation machine are put in place, the lifting support is pressed, and equipment is lifted; after the equipment is lifted in place and installed, the ground anchor 15 is used for fixing the position of the equipment, so that the assembly of the coiled tubing operation machine is realized, and the other difficulty of using the coiled tubing operation machine underground is effectively overcome, namely the problems that some parts of the coiled tubing operation machine have large dead weight, are difficult to install and fix when used in a way of being parallel to the ground.

When the invention works specifically, when underground drilling fracturing or other related operations are required, firstly, a casing 2 is put into an open hole for well cementation, a flange is arranged at the opening of the casing 2, a wellhead four-way joint 3 is connected, at the moment, a tool string required by the operation is put into the well, and a connector is left for waiting to be connected with a continuous oil pipe; according to the operation requirement, the coiled tubing blowout preventer assembly 4 (a coiled tubing blowout preventer is not used in some cases, only a coiled tubing blowout preventer box is installed), the injection head 5, the clamp 5-1, the guide gooseneck 6 and the roller 9 are arranged in place according to the sequence shown in the figure 1, each hydraulic support 12 is adjusted to a proper height, the coiled tubing 7 penetrates through the equipment according to the method shown in the figure 1, and the coiled tubing 7 is connected with the operation tool string. And then, connecting the wellhead four-way joint 3 with the coiled tubing blowout prevention assembly 4 by using a flange, and fixing the position of equipment by using a ground anchor 15.

When the continuous oil pipe is dragged to carry out staged fracturing, the first gate valve 3-1 is connected with a water pump, and the second gate valve 3-2 is connected with a solid-liquid separation device; closing the first gate valve 3-1, opening the second gate valve 3-2, starting the injection head 5, dragging the tool string to a proper position, and closing a half-seal gate plate in the coiled tubing blowout preventer if necessary; after the perforation is finished, closing the second gate valve 3-2, opening the first gate valve 3-1, and performing fracturing operation; and after the operation is finished, opening the second gate valve 3-2, starting the injection head 5, dragging the oil pipe, and performing the next section of fracturing operation.

According to the above content, the coiled tubing operation machine suitable for dragging and fracturing the coiled tubing under the coal mine has the following effects:

(1) the coiled tubing operation machine can be used for dragging the coiled tubing under pressure in the coal mine;

(2) the invention has small volume and is suitable for underground transportation and operation of coal mines;

(3) aiming at the special operation requirements of the underground coal mine, a novel guide gooseneck is designed, the safe curvature radius of the coiled tubing is utilized to the maximum extent, and the coiled tubing is prevented from being bent and damaged while the space is saved;

(4) the height of each part of the device can be adjusted according to the operation requirement, so that the device is labor-saving, safe, convenient and fast, and the accurate control of the device placement height is realized.

It should be apparent that the foregoing description and illustrations are by way of example only and are not intended to limit the present disclosure, application or uses. While embodiments have been described in the embodiments and depicted in the drawings, the present invention is not limited to the particular examples illustrated by the drawings and described in the embodiments as the best mode presently contemplated for carrying out the teachings of the present invention, and the scope of the present invention will include any embodiments falling within the foregoing description and the appended claims.