阅读说明：本技术 一种无钻台井口作业溢流液收集装置 (No drill floor well head operation overflow liquid collection device ) 是由 张建党 游静 王伟红 胡选平 阮小明 刘林学 于 2019-09-26 设计创作，主要内容包括：本发明提供了一种无钻台井口作业溢流液收集装置,包括导流筒,固定在导流筒的下端面的井口连接法兰,井口连接法兰用于与井口装置法兰固定连接而压紧自封芯子,导流筒的内腔用于供油管从下向上穿出且容纳从自封芯子处溢流的液体,导流筒的上部具有与其内腔连通的收集口,收集口用于盛接拆卸掉的油管中的液体；导流筒上开设有出液孔,用于将导流筒内腔中的液体排出；井口溢出的液体从出液孔排出,油管中的溢流液从收集口进入导流筒然后经过出液孔排出；溢流液收集装置既能够收集井口溢流液也能够收集油管中的液体,从而避免在起油管时井口溢流或者拆卸油管时油管中的液体横流造成井口周围环境污染的问题。(The invention provides a drilling platform-free wellhead operation overflow liquid collecting device, which comprises a guide cylinder and a wellhead connecting flange fixed on the lower end surface of the guide cylinder, wherein the wellhead connecting flange is used for being fixedly connected with a wellhead device flange to compress a self-sealing core, an inner cavity of the guide cylinder is used for an oil supply pipe to penetrate out from bottom to top and accommodating liquid overflowing from the self-sealing core, the upper part of the guide cylinder is provided with a collecting port communicated with the inner cavity of the guide cylinder, and the collecting port is used for accommodating liquid in a detached oil pipe; the guide cylinder is provided with a liquid outlet hole for discharging liquid in the inner cavity of the guide cylinder; liquid overflowing from the well mouth is discharged from the liquid outlet hole, and overflowing liquid in the oil pipe enters the guide cylinder from the collecting hole and then is discharged from the liquid outlet hole; the overflow liquid collecting device can collect overflow liquid at the wellhead and can also collect liquid in the oil pipe, so that the problem of environmental pollution around the wellhead caused by overflow of the wellhead when the oil pipe is lifted or transverse flow of the liquid in the oil pipe when the oil pipe is detached is avoided.)

1. The utility model provides a no rig floor well head operation overflow liquid collection device, characterized by includes:

a draft tube;

the wellhead connecting flange is fixed on the lower end surface of the guide cylinder and is used for being fixedly connected with the wellhead device flange to tightly press the self-sealing core;

the inner cavity of the guide cylinder is used for the oil supply pipe to penetrate out from bottom to top and accommodating liquid overflowing from the self-sealing core;

the upper part of the guide cylinder is provided with a collecting port communicated with the inner cavity of the guide cylinder, and the collecting port is used for containing liquid in the detached oil pipe;

and the liquid outlet hole is formed in the guide cylinder and used for discharging liquid in the inner cavity of the guide cylinder.

2. The apparatus as claimed in claim 1, further comprising a collecting cylinder connected to the guide cylinder, wherein the collecting cylinder has an upper opening forming the collecting opening, and the size of the collecting opening of the collecting cylinder is larger than that of the upper port of the guide cylinder.

3. The overflow liquid collecting device for wellhead operation without the drill floor as claimed in claim 2, wherein the upper end of the guide shell extends upwards to the collecting opening of the guide shell, the upper end of the guide shell is provided with a bearing surface for bearing the tubing elevator, and the guide shell is provided with a liquid inlet hole for communicating the collecting shell and the inner cavity of the guide shell.

4. The apparatus of claim 3, wherein an elevator flange is fixedly attached to the top end of the draft tube, and the top end surface of the elevator flange forms the bearing surface.

5. The apparatus as claimed in any one of claims 2 to 4, wherein the collection cylinder is a conical cylinder with a large upper opening and a small lower opening.

6. The apparatus as claimed in claim 5, wherein a reinforcing rib is fixedly disposed between the upper end of the collecting barrel and the elevator bearing flange.

7. The device for collecting overflow liquid in wellhead operation without the drilling platform as claimed in any one of claims 1 to 4, wherein the lower end surface of the wellhead connecting flange is provided with a groove for matching with the self-sealing core.

8. The device for collecting overflow liquid in wellhead operation without drilling platform as claimed in any one of claims 1-4, wherein the wellhead connecting flange is provided with a limiting surface for preventing circumferential rotation of the outer peripheral surface of the nut of the flange bolt.

9. The apparatus as claimed in claim 8, wherein the upper portion of the bolt hole of the wellhead connecting flange is provided with a bolt limiting groove, and two parallel groove walls of the bolt limiting groove form the limiting surface.

10. The flow collection device for the drillless wellhead operation according to any one of claims 1 to 4, wherein a positioning pin for facilitating the alignment of the wellhead connecting flange and the wellhead flange is fixed on the lower end surface of the wellhead connecting flange.

Technical Field

The invention relates to the technical field of petroleum machinery, in particular to a device for collecting overflow liquid during wellhead operation without a drill floor.

Background

When the oil-water well in the oil field is constructed in the downhole operation, the method in the prior art is to fix a wellhead device (such as a blowout preventer) on a flange of a large four-way joint, then install the self-sealing core on the blowout preventer, and adopt a special flange to be fixedly connected with the flange of the blowout preventer so as to tightly press the self-sealing core on the blowout preventer. When the oil pipe is lifted, the oil pipe penetrates through the self-sealing core, then the oil pipe is clamped on the oil pipe penetrating out of the self-sealing core by a hoisting clamp, the oil pipe is hoisted out of the oil well, and the oil pipe is matched with the self-sealing core in a sliding sealing mode in the hoisting process, so that liquid in the oil well is prevented from overflowing.

However, because the oil well is provided with hundreds of oil pipes, and each oil pipe is long, in the process of lifting the oil pipe, the oil pipe generates long-time sliding friction with the self-sealing core, because the self-sealing core is formed by pouring rubber, a through hole penetrating out of an oil supply pipe on the self-sealing core is continuously ground by long-time friction, liquid in the well overflows from a gap between the through hole on the self-sealing core and the oil pipe, and the overflowing liquid directly flows to the well mouth to pollute the surrounding environment of the well mouth. In addition, in the process of lifting the oil pipe in operation, after the oil pipe to be disassembled is lifted by a lifting tool, the upper end of the oil pipe connected with the lower end of the oil pipe to be disassembled is clamped by a lifting clamp to prevent the oil pipe at the lower end from falling downwards, then the oil pipe at the uppermost end is disassembled, and because the oil pipe is filled with liquid, when one oil pipe is disassembled, the liquid in the oil pipe flows to a wellhead from the opening at the lower end, and the wellhead is also polluted.

Disclosure of Invention

The invention aims to provide a drilling platform-free wellhead operation overflow liquid collecting device, which solves the problem that the surrounding environment of a wellhead is polluted due to wellhead overflow when an oil pipe is lifted and oil-water cross flow in the oil pipe when the oil pipe is disassembled in the prior art.

In order to achieve the purpose, the technical scheme of the overflow liquid collecting device for the wellhead operation without the drill floor is as follows:

a no rig floor wellhead operation overflow fluid collection device, includes:

a draft tube;

the wellhead connecting flange is fixed on the lower end surface of the guide cylinder and is used for being fixedly connected with the wellhead device flange to tightly press the self-sealing core;

the inner cavity of the guide cylinder is used for the oil supply pipe to penetrate out from bottom to top and accommodating liquid overflowing from the self-sealing core;

the upper part of the guide cylinder is provided with a collecting port communicated with the inner cavity of the guide cylinder, and the collecting port is used for containing liquid in the detached oil pipe;

and the liquid outlet hole is formed in the guide cylinder and used for discharging liquid in the inner cavity of the guide cylinder.

Has the advantages that: the overflow liquid collecting device is used for a wellhead without a drill floor, and when liquid in a well overflows from a gap between a perforation on the self-sealing core and an oil pipe in the process of operating the oil pipe, the overflowing liquid is directly discharged from the liquid outlet. When the oil pipe is disassembled, liquid in the oil pipe enters the guide shell through the collecting port at the upper part of the guide shell and then is led out from the liquid outlet hole. The overflow liquid collecting device can collect overflow liquid at the wellhead and can also collect liquid in the oil pipe, so that the problem of environmental pollution around the wellhead caused by overflow of the wellhead when the oil pipe is lifted or transverse flow of the liquid in the oil pipe when the oil pipe is detached is avoided.

Furthermore, the device also comprises a collecting cylinder connected with the guide cylinder, wherein the upper end opening of the collecting cylinder forms the collecting opening, and the size of the collecting opening of the collecting cylinder is larger than that of the upper port of the guide cylinder.

Has the advantages that: the collection of fluid in the oil pipe is conveniently realized.

Furthermore, the upper end of the guide cylinder extends upwards to the collecting opening of the collecting cylinder, the upper end of the guide cylinder is provided with a bearing surface for bearing the oil pipe elevator, and the guide cylinder is provided with a liquid inlet hole for communicating the collecting cylinder with the inner cavity of the guide cylinder.

Has the advantages that: the elevator is convenient to place, a device special for placing the oil pipe elevator is not required to be arranged around the overflow liquid collecting device, and the device arrangement around the wellhead without the drill floor is simplified.

Furthermore, the upper end of the guide shell is fixedly connected with an elevator bearing flange, and the upper end surface of the elevator bearing flange forms the bearing surface.

Has the advantages that: can carry out more stable support to the oil pipe elevator.

The collecting cylinder is a conical cylinder with a large opening at the upper end and a small opening at the lower end.

Has the advantages that: the liquid collected by the collecting cylinder flows to the guide cylinder more smoothly.

Furthermore, a reinforcing rib is fixedly arranged between the upper end of the collecting cylinder and the elevator bearing flange.

Has the advantages that: the structural strength of the collecting barrel is increased, so that the collecting barrel can bear the long-term impact of liquid in the oil pipe.

The lower end face of the well mouth connecting flange is provided with a groove used for being matched with the self-sealing core.

Has the advantages that: the well mouth connecting flange is convenient to be matched with the self-sealing core, and the fixed connection between the well mouth connecting flange and the well mouth device flange is more stable and reliable.

And a limiting surface for preventing the peripheral surface of the nut of the flange bolt from rotating circumferentially is arranged on the wellhead connecting flange.

Has the advantages that: avoid when revolving the wrong nut that the bolt takes place circumferential direction, make things convenient for screwing up of the nut on the well head flange, make the well head flange can be faster carry out fixed connection with the well head device.

Furthermore, the upper part of the bolt hole of the wellhead connecting flange is provided with a bolt limiting groove, and two parallel groove walls of the bolt limiting groove form the limiting surface.

Has the advantages that: the bolt that avoids on the well head flange that can be better takes place circumference and splines to the bolt is installed and is put into the counter bore behind the bolt spacing groove in other words, avoids the bolt upper end to lead to the bolt not hard up because of contacting with other.

Furthermore, a positioning pin which facilitates alignment of the wellhead connecting flange and the wellhead device flange is fixed on the lower end face of the wellhead connecting flange.

Has the advantages that: alignment between the wellhead connecting flange and the wellhead flange is facilitated, thereby providing for a fixed connection between the wellhead connecting flange and the wellhead.

Drawings

FIG. 1 is a schematic structural diagram of a first embodiment of an overflow fluid collection device for a rig-floor-less wellhead operation according to the present invention;

fig. 2 is a cross-sectional view a-a of the topless wellhead operation overflow collection device of fig. 1.

In the figure: 1-a wellhead connecting flange; 2-a guide shell; 3-a collection cylinder; 4-reinforcing ribs; 5-an elevator bearing flange; 6-a flow guide pipe; 7-a positioning pin; 11-bolt holes; 12-a groove; 13-bolt limiting groove; 21-liquid inlet hole; 22-liquid outlet holes; 61-a thread segment; 71-conical guiding head.

Detailed Description

The overflow liquid collecting device for the wellhead operation without the drill floor of the invention is further explained with reference to the attached drawings 1 to 2.

One as shown in figure 1 and figure 2 of the embodiment of no rig floor well head operation overflow liquid collection device, no rig floor well head operation overflow liquid collection device includes along the draft tube 2 that upper and lower direction extended the setting, draft tube 2 is cylindric structure, the concentric vertical fixation of lower terminal surface of draft tube 2 has well head flange 1, no rig floor well head operation overflow liquid collection device passes through well head flange 1 and well head device flange fixed connection, in this embodiment, the well head device is the preventer, thereby well head flange 1 and the flange fixed connection of preventer upper end realize overflow liquid collection device's fixed mounting. The outer circumference of draft tube 2 upper portion is fixed with collecting cylinder 3, and collecting cylinder 3 is the toper section of thick bamboo that the upper end opening is big, the lower extreme opening is little, and the upper end opening of collecting cylinder 3 constitutes the collection mouth, and the size of collection mouth is greater than the size of draft tube 2 upper port to conveniently accept the liquid in the oil pipe. Liquid inlet holes 21 are uniformly distributed on the upper part of the guide shell 2, the collecting shell 3 is communicated with the inner cavity of the guide shell 2 through the liquid inlet holes 21, and the lower part of the collecting shell 3 is positioned below the liquid inlet holes 21. The upper end of the draft tube 2 is provided with a bearing surface for bearing an oil pipe elevator, in the embodiment, the upper end of the draft tube 2 is fixedly connected with an elevator bearing flange 5, the upper end surface of the elevator bearing flange 5 forms the bearing surface, and the elevator bearing flange 5 is arranged at the collecting port of the collecting tube 3. Liquid outlet 22 has been seted up to draft tube 2 lower part, and no rig floor well head operation overflow liquid collection device still includes draft tube 6, and the one end of draft tube 6 just fixes on draft tube 2 around liquid outlet 22 with liquid outlet 22 intercommunication, and the other end of draft tube 6 is provided with screw thread section 61, and draft tube 6 passes through screw thread section 61 and retrieves the pipeline intercommunication to communicate with the blowdown pond that is used for splendid attire overflow liquid through retrieving the pipeline.

In order to increase the structural strength of the collecting cylinder 3, reinforcing ribs 4 are uniformly and fixedly arranged between the upper end of the collecting cylinder 3 and an elevator bearing flange 5, in order to enable the connection between the wellhead connecting flange 1 and a flange at the upper end of a blowout preventer to be more stable and reliable, a groove 12 used for being matched with a wellhead self-sealing core is arranged on the lower end face of the wellhead connecting flange 1, the self-sealing core is formed by pouring rubber, a certain drawing slope is formed on the upper portion of the self-sealing core, the groove 12 is a conical groove in order to be matched with the self-sealing core better, and therefore after the wellhead connecting flange 1 is fixedly connected with the upper end flange of the blowout preventer, the self-sealing core can seal holes in the center of the wellhead connecting flange 1, and liquid in the guide cylinder 2 is prevented from flowing into a well from gaps between the center holes of the wellhead connecting flange 1 and oil pipes.

In order to conveniently align a wellhead connecting flange 1 on the overflow liquid collecting device in the drilling-floor-free wellhead operation with a flange at the upper end of a blowout preventer, a positioning pin 7 is fixedly connected to the lower end face of the wellhead connecting flange 1, a conical guide head 71 is arranged at the lower part of the positioning pin 7, and the positioning pin 7 can be matched with a bolt hole of the flange at the upper end of the blowout preventer to accurately and quickly align the wellhead connecting flange 1 with the flange at the upper end of the blowout preventer. Be provided with the spacing face that circumferential direction takes place for the outer peripheral face that prevents flange bolt's nut on well head flange 1, in this embodiment, well head flange bolt's bolt hole upper portion is provided with bolt spacing groove 13, and two parallel cell walls of bolt spacing groove 13 constitute spacing face to make things convenient for screwing up of the bolt on well head flange 1, make well head flange 1 can be faster carry out fixed connection with the wellhead assembly.

The invention relates to a device for collecting overflow liquid during operation of a non-drill floor wellhead, which is suitable for the non-drill floor wellhead, and is characterized in that before underground operation construction of an oil-water well in an oil field, a blowout preventer is fixed on a flange of a large cross joint, then a wellhead self-sealing core is arranged on the blowout preventer, then the overflow liquid during operation of the non-drill floor wellhead is collected and placed on the blowout preventer, a positioning pin 7 is inserted into a bolt hole of a flange at the upper end of the blowout preventer, so that the wellhead connecting flange 1 is accurately and quickly positioned, a conical groove of the wellhead connecting flange 1 is in tight fit with the upper part of the self-sealing core, then a bolt sequentially penetrates through a bolt hole 11 on the wellhead connecting flange 1 and a bolt hole of the flange at the upper end of the blowout preventer from top to bottom, at the moment, a nut at the upper end of. After the well head connecting flange 1 is fixedly connected with the upper end flange of the blowout preventer, the self-sealing core can be tightly sealed and pressed between the well head connecting flange 1 and the upper end flange of the blowout preventer. After all the bolt connections are fastened, the collecting pipeline is connected with the flow guide pipe 6 and is led into the sewage disposal pool, and then operation construction can be carried out.

When the oil pipe is lifted, the oil pipe passes through the self-sealing core of the well mouth and the inner cavity of the guide cylinder 2 from the bottom to the top in sequence and finally penetrates out of the elevator bearing flange 5, the oil pipe elevator is placed on the elevator bearing flange 5, the oil pipe elevator is clamped at the upper end of the oil pipe, the elevator is hung by a lifting hook of a lifting appliance, the elevator is lifted upwards by the lifting appliance so as to lift the oil pipe from the well, when a second oil pipe connected with the lower end of the uppermost oil pipe is exposed out of the elevator bearing flange 5, the upper end of the second oil pipe is clamped by another elevator so as to ensure that the second oil pipe is kept at the elevator bearing flange 5 and does not fall, then the uppermost oil pipe is buckled, at the moment, the liquid discharged from the lower end of the uppermost oil pipe enters the collecting cylinder 3 through the collecting port, then enters the guide cylinder 2 through the liquid inlet 21 on the upper part of the guide cylinder 2, and the liquid is guided into the collecting pipeline, collected to a designated sewage disposal pool through a collection pipeline. Because the oil well has hundreds of oil pipes, and the length of each oil pipe is longer, like this at the in-process of playing oil pipe, oil pipe will take place sliding friction with the core of proclaiming oneself always, through long-time friction, proclaiming oneself on the core and supply the perforation that oil pipe wore out constantly by big, liquid in the well can overflow out from the perforation on the core of proclaiming oneself and the gap between the oil pipe, the liquid accessible play liquid hole 22 and honeycomb duct 6 introduction collection pipeline that overflows in the well head, collect to appointed blow-down pond in through the collection pipeline. Thereby the collection and the environmental pollution problem of well head waste liquid when can effectively solve the operation have also solved the problem that the well head operation place is wet smooth simultaneously, have ensured construction safety.

In this embodiment, no rig floor well head operation overflow liquid collection device still includes the collecting vessel of being connected with the draft tube, the upper end opening of collecting vessel constitutes the collecting opening, the size of the collecting opening of collecting vessel is greater than the size of port on the draft tube, in other embodiments, overflow liquid collection device can also not include the collecting vessel, at this moment the cylinder diameter of draft tube is great, the upper end opening of draft tube constitutes the collecting opening, liquid in the oil pipe passes through the upper end opening of draft tube and collects to the draft tube in, then discharge through the drain hole of draft tube lower extreme, perhaps directly make the draft tube main aspects funnel shaped structure up with the draft tube, the upper end opening of draft tube constitutes the collecting opening this moment.

In this embodiment, the upper end of the guide cylinder extends upwards to the collection port of the collection cylinder, the upper end of the guide cylinder is provided with a bearing surface for bearing the oil pipe elevator, the guide cylinder is provided with a liquid inlet hole for communicating the collection cylinder with the inner cavity of the guide cylinder, in other embodiments, the collection cylinder can be fixed around the opening at the upper end of the guide cylinder, at this time, the guide cylinder of the overflow liquid collection device does not extend upwards, meanwhile, the upper end of the guide cylinder is not provided with the bearing surface for bearing the oil pipe elevator, and a special elevator bearing structure is arranged for placing the oil pipe elevator.

In the embodiment, the upper end of the guide cylinder is fixedly connected with an elevator bearing flange, and the upper end surface of the elevator bearing flange forms a bearing surface; or the elevator bearing structure can also be a ring platform fixed at the upper end of the guide shell, and the upper end surface of the ring platform forms a bearing surface for bearing the elevator.

In this embodiment, the upper end of draft tube upwards extends to the collecting port department of collecting vessel, and in other embodiments, the upper end of draft tube upwards extends to slightly less than the collecting port department of collecting vessel or is slightly more than the collecting port department of collecting vessel.

In this embodiment, the fixed strengthening rib that is provided with between the upper end of collecting vessel and elevator bearing flange, in other embodiments, also can not set up the strengthening rib, increases the structural strength of collecting vessel through the thickness that increases the collecting vessel to make the collecting vessel can bear the continuous impact of liquid in the oil pipe, perhaps set up the strengthening rib between the periphery of the below of collecting vessel and draft tube, make the strengthening rib support the below of collecting vessel.

In this embodiment, the collecting cylinder is a conical cylinder with a large opening at the upper end and a small opening at the lower end, and in other embodiments, the collecting cylinder may also be a cylindrical structure, and the size of the cylinder opening of the collecting cylinder is greater than that of the cylinder opening of the flow guide pipe.

In this embodiment, well head flange's lower terminal surface is provided with and is used for proclaiming oneself core complex recess with the well head, in other embodiments, also can not set up the recess at well head flange's lower terminal surface, and set up the recess on the flange with well head flange complex preventer upper end, make the well head proclaim oneself the recess that the core was arranged in the flange of preventer upper end in, and proclaim oneself the flange of the core a little higher than preventer upper end, behind well head flange and preventer upper end flange fixed connection, well head flange can compress tightly the well head proclaim oneself the core downwards.

In this embodiment, be provided with the spacing face that prevents that circumferential direction from taking place for the nut outer peripheral face of flange bolt on the well head flange, in other embodiments, can also not set up on the well head flange and prevent that the bolt from taking place circumferential direction's spacing face, when carrying out fixed connection with well head flange and blowout preventer flange with the bolt, pass the flange of well head flange and preventer upper end from the top down in proper order with the bolt, then prevent that the bolt from taking place circumferential direction with the spanner in the upper end of bolt, tighten at the lower extreme of bolt with the nut.

In this embodiment, the bolt hole upper portion of well head flange is provided with the bolt spacing groove, and the two parallel cell walls in bolt spacing groove constitute spacing face, in other embodiments, also can not set up the bolt spacing groove on well head flange's bolt hole upper portion, and set up on well head flange's up end and prevent that the bolt from taking place circumferential direction's spacing face.

In this embodiment, well head flange's lower terminal surface is fixed with the locating pin that makes things convenient for well head flange and wellhead assembly flange to aim at, in other embodiments, also can not set up the locating pin, aims at well head flange and wellhead assembly through the manual work.

In this embodiment, the wellhead assembly is a blowout preventer, and in other embodiments, the wellhead assembly may also be other devices capable of preventing a blowout.