阅读说明：本技术 一种监测井井口密封装置及设置方法 (Wellhead sealing device of monitoring well and setting method ) 是由 肖海龙 张新伟 丁桂伶 孙梓航 张建良 刘俊明 付晨 徐兴全 骆斌 李颖 何欣 于 2021-10-15 设计创作，主要内容包括：本发明公开了一种监测井井口密封装置及设置方法,密封装置是在监测井孔口管顶端的敞口处装配有孔口密封管,孔口密封管通过卡盘与孔口管的顶端相固连。孔口密封管与孔口管之间相连接的卡盘设置有两个,两个卡盘对称进行设置,卡盘通过螺栓使孔口密封管和孔口管紧固连接,密封装置的设置方法为：步骤一、将孔口密封管的底端放置在孔口管顶端对齐开孔位置并压紧；步骤二、卡盘夹紧孔口管和孔口密封管；步骤三、将监测仪器下放到监测目的层；步骤四、电缆密封座与孔口密封管连接紧固；步骤五、将电缆密封堵头与电缆密封座连接紧固。有益效果：彻底避免了差异沉降对地表建筑工程造成的危害。(The invention discloses a monitoring well mouth sealing device and an arrangement method thereof. The chuck that is connected between drill way sealed tube and the drill way pipe is provided with two, and two chuck symmetries set up, and the chuck makes drill way sealed tube and drill way pipe fastening connection through the bolt, and sealing device's setting method is: placing the bottom end of an orifice sealing pipe at the position, aligned with an opening, of the top end of the orifice pipe and pressing the bottom end of the orifice sealing pipe; step two, clamping the orifice pipe and the orifice sealing pipe by using a chuck; step three, putting the monitoring instrument down to a monitoring target layer; fourthly, connecting and fastening the cable sealing seat and the orifice sealing pipe; and step five, connecting and fastening the cable sealing plug and the cable sealing seat. Has the advantages that: the damage to the surface construction engineering caused by differential settlement is thoroughly avoided.)

1. A monitoring well wellhead sealing device is characterized in that: an orifice sealing tube is assembled at an opening at the top end of the orifice tube of the monitoring well, and the orifice sealing tube is fixedly connected with the top end of the orifice tube through a chuck.

2. A monitoring well wellhead sealing device according to claim 1, characterised in that: the drill way sealing pipe is characterized in that two chucks connected between the drill way sealing pipe and the drill way pipe are symmetrically arranged, the chucks enable the drill way sealing pipe and the drill way pipe to be tightly connected through bolts, and a sealing ring is assembled between the bottom of the drill way sealing pipe and the top of the drill way pipe for sealing.

3. A monitoring well wellhead sealing device according to claim 1 or claim 2, characterised in that: the top end of the orifice sealing tube is screwed with a cable sealing seat, a central channel is arranged in the middle of the cable sealing seat and is communicated with the inner cavity of the orifice sealing tube, the top end of the central channel arranged in the middle of the cable sealing seat is screwed with a cable sealing plug, a sealing ball is arranged at the bottom end of the cable sealing plug, and through holes communicated with the central channel are formed in the central parts of the cable sealing plug and the sealing ball and are used for the penetration of working cables.

4. A monitoring well wellhead sealing device according to claim 3, characterised in that: the sealing ball is a cowhells ball.

5. A setting method of a wellhead sealing device of a monitoring well is characterized by comprising the following steps: the method comprises the following steps:

firstly, placing a sealing ring in a groove at the top end of an orifice pipe, and then placing the bottom end of the orifice sealing pipe at the top end of the orifice pipe to align with an opening position and compressing;

step two, clamping the orifice pipe and the orifice sealing pipe by using two chucks, and connecting and fastening by using bolts;

thirdly, lowering the monitoring instrument to a monitoring target layer through the inner cavity of the orifice sealing pipe;

connecting and fastening the cable sealing seat and the orifice sealing pipe, and enabling the cable to penetrate through the sealing ball;

and step five, connecting and fastening the cable sealing plug and the cable sealing seat and extruding the sealing ball to deform the sealing ball so as to achieve the sealing effect.

Technical Field

The invention relates to a sealing device and a setting method, in particular to a wellhead sealing device of a monitoring well and a setting method.

Background

At present, in the construction and daily monitoring work of a monitoring well, a well head is open. In areas with poor geological conditions, stratum pressure relief is easily caused by the sudden increase of crustal movement and external load, so that geological disasters such as sandy soil liquefaction, ground settlement and the like are caused. In particular, to cause differential settlement over a small range, which may be detrimental to surface construction, particularly linear projects. Therefore, the pressure maintaining device is very important for the pressure maintaining work inside the monitoring well, but the existing device is difficult to effectively solve the problems.

Disclosure of Invention

The invention aims to provide a wellhead sealing device of a monitoring well and a setting method thereof, which aim to ensure the internal pressure of the monitoring well and prevent differential settlement from causing harm to surface building engineering.

The invention provides a wellhead sealing device of a monitoring well, which is characterized in that an orifice sealing pipe is assembled at an opening at the top end of a wellhead pipe of the monitoring well, and the orifice sealing pipe is fixedly connected with the top end of the wellhead pipe through a chuck.

The chuck that is connected between drill way sealed tube and the drill way pipe is provided with two, and two chuck symmetries set up, and the chuck makes drill way sealed tube and drill way pipe fastening connection through the bolt, is equipped with the sealing washer between the bottom of drill way sealed tube and the top of drill way pipe and seals.

The top spiro union of drill way sealed tube has cable seal seat, and central channel has been seted up to cable seal seat's centre, and central channel is linked together with drill way sealed tube's inner chamber, and the central channel top spiro union of seting up in the middle of the cable seal seat has cable seal end cap, and cable seal end cap's bottom is provided with the ball sealer, and the through-hole that is linked together with central channel all is seted up in cable seal end cap and ball sealer's central point and is used for wearing to establish of working cable.

The sealing ball is a cowhells ball.

The invention provides a setting method of a wellhead sealing device of a monitoring well, which comprises the following steps:

firstly, placing a sealing ring in a groove at the top end of an orifice pipe, and then placing the bottom end of the orifice sealing pipe at the top end of the orifice pipe to align with an opening position and compressing;

step two, clamping the orifice pipe and the orifice sealing pipe by using two chucks, and connecting and fastening by using bolts;

thirdly, lowering the monitoring instrument to a monitoring target layer through the inner cavity of the orifice sealing pipe;

connecting and fastening the cable sealing seat and the orifice sealing pipe, and enabling the cable to penetrate through the sealing ball;

and step five, connecting and fastening the cable sealing plug and the cable sealing seat and extruding the sealing ball to deform the sealing ball so as to achieve the sealing effect.

The invention has the beneficial effects that:

the wellhead sealing device and the setting method of the monitoring well provided by the invention can effectively prevent stratum pressure release caused by crustal movement and sudden increase of external load, prevent geological disasters such as sandy soil liquefaction, ground settlement and the like, and thoroughly avoid damage of differential settlement to surface construction engineering.

Drawings

Fig. 1 is a schematic view of the overall structure of the wellhead sealing device of the monitoring well.

Fig. 2 is a sectional structure plan view of the wellhead sealing device of the monitoring well.

The labels in the above figures are as follows:

1. orifice pipe 2, orifice sealing pipe 3, chuck 4, bolt 5, sealing washer

6. Cable sealing seat 7, cable sealing plug 8, sealing ball 9 and monitoring instrument

10. An electrical cable.

Detailed Description

Please refer to fig. 1 to 2:

the invention provides a wellhead sealing device of a monitoring well, which is characterized in that an orifice sealing pipe 2 is assembled at an opening at the top end of a wellhead pipe 1 of the monitoring well, and the orifice sealing pipe 2 is fixedly connected with the top end of the wellhead pipe 1 through a chuck 3.

Chuck 3 that is connected between orifice sealing pipe 2 and the orifice pipe 1 is provided with two, and two chuck 3 symmetries set up, and chuck 3 makes orifice sealing pipe 2 and orifice pipe 1 fastening connection through bolt 4, is equipped with sealing washer 5 between the bottom of orifice sealing pipe 2 and the top of orifice pipe 1 and seals.

The top spiro union of drill way sealed tube 2 has cable seal receptacle 6, and central channel has been seted up to the centre of cable seal receptacle 6, and central channel is linked together with drill way sealed tube 2's inner chamber, and the central channel top spiro union of seting up in the middle of cable seal receptacle 6 has cable seal end cap 7, and the bottom of cable seal end cap 7 is provided with sealing ball 8, and the through-hole that is linked together with central channel all is seted up in the central part of cable seal end cap 7 and sealing ball 8 is used for wearing to establish of working cable 10.

The sealing ball 8 is a cowhells ball.

The invention provides a setting method of a wellhead sealing device of a monitoring well, which comprises the following steps:

firstly, placing a sealing ring 5 in a groove at the top end of an orifice pipe 1, and then placing the bottom end of an orifice sealing pipe 2 at the top end of the orifice pipe 1 to align with a hole opening position and compressing;

step two, clamping the orifice pipe 1 and the orifice sealing pipe 2 by using two chucks 3, and connecting and fastening by using bolts 4;

thirdly, lowering the monitoring instrument 9 to a monitoring target layer through the inner cavity of the orifice sealing tube 2;

step four, connecting and fastening the cable sealing seat 6 and the orifice sealing tube 2, and penetrating the cable 10 through the sealing ball 8;

and step five, connecting and fastening the cable sealing plug 7 and the cable sealing seat 6, and extruding the sealing ball 8 to deform the sealing ball to achieve the sealing effect.