Plunger self-positioning method
Technical Field
The invention relates to the technical field of oil exploitation, in particular to a plunger self-positioning method.
Background
With continuous development of gas fields, the proportion of low-yield and low-efficiency wells is increased year by year, and how to exert the productivity of the low-yield and low-efficiency wells and keep the stable production of gas wells becomes a technical problem to be solved urgently. From the evaluation result in the aspect of yield increase effect, the plunger gas lift water drainage gas production technology is suitable for gas wells with small gas quantity (more than one thousand of daily gas production quantity) and high liquid-gas ratio (less than five/ten thousand of daily gas production quantity), and the slippage loss of a shaft is small. Therefore, the plunger gas lift water drainage gas recovery technology is an effective measure for improving the recovery ratio of the low-yield low-efficiency well.
The existing plunger gas lift drainage method is to place the lower part of the plunger to a proper position through a rope, and has complex working procedures and low efficiency.
Disclosure of Invention
The invention aims to provide a plunger self-positioning method, which solves the technical problems of complex process and low efficiency of placing a plunger into a pipeline in the existing oil exploitation process. The technical effects that can be produced by the preferred technical scheme in the technical schemes provided by the invention are described in detail in the following.
In order to achieve the purpose, the invention adopts the following technical scheme:
a plunger self-positioning method comprising the steps of:
s1 coating a soluble material coating on the side face of the plunger;
s2, connecting the plunger and the limiting buffer device through a connecting device;
s3, placing the set plunger into the pipeline;
s4, opening a monitoring instrument and a nitrogen injection device, monitoring the distance of the wellhead of the plunger in real time, stopping injecting nitrogen when the monitoring instrument monitors that the plunger falls to a set distance, dissolving the soluble material coating and the connecting device in water, and starting reciprocating work of the plunger in the pipeline;
be equipped with in the pipeline and be used for the screens hole for spacing buffering nipple joint location, the coating of plunger side has the soluble material coating, connecting device also adopts soluble material to make.
Preferably, the screens hole in the pipeline sets up below the liquid level.
Preferably, the soluble material is magnesium aluminum alloy.
Preferably, the thickness of the soluble material coating is the difference between the plunger tube and the plunger radius.
Preferably, the monitoring instrument is an ultrasonic range finder.
Based on the technical scheme, the following technical effects can be generated:
the plunger self-positioning method provided by the embodiment of the invention can be used for lowering the plunger by a plunger gas lift drainage method. According to the plunger self-positioning method, the soluble coating is arranged between the side face of the plunger and the gap of the pipeline, the connecting device made of the soluble material is connected with the limiting buffer short section, when the soluble coating and the connecting device are dissolved in water, the plunger is separated from the limiting buffer device, and the plunger is lowered. The technical problems that the process of putting the plunger into the pipeline is complex and the efficiency is low in the existing oil exploitation process are solved. According to the plunger self-positioning method, when the plunger reaches the pipeline clamping position, the plunger can be automatically clamped and separated from the limiting buffer, so that the use of rope placement is avoided, the placement step is simplified, and the placement efficiency is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of the structural principle of the present invention;
in the figure: 1. A pipeline; 2. a limiting buffer short section; 3. a connecting device; 4. a plunger; 5. a soluble material coating; 6. monitoring an instrument; 7. a nitrogen gas injection device; 8. the liquid level.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
The invention will be further described with reference to the accompanying drawings, but the scope of the invention is not limited to the following.
As shown in fig. 1:
the invention provides a plunger self-positioning method, which comprises the following steps:
s1 coating the soluble material coating 5 on the side surface of the plunger 4;
s2, the plunger 4 and the limiting and buffering device 2 are connected through the connecting device 3;
s3, placing the arranged plunger 4 into the pipeline 1;
s4, opening the monitoring instrument 6 and the nitrogen injection device 7, monitoring the distance of the well mouth of the plunger 4 in real time, stopping injecting nitrogen when the monitoring instrument 6 monitors that the plunger falls to a set distance, dissolving the soluble material coating 5 and the connecting device 3 in water, and enabling the plunger 4 to work in a reciprocating mode in the pipeline;
be equipped with in the pipeline 1 and be used for the screens hole for spacing buffering nipple joint 2 location, the coating of 4 side of plunger has soluble material coating 5, connecting device 3 also adopts soluble material to make.
As an alternative embodiment, a detent hole in the pipe 1 is provided below the liquid level 8.
In an alternative embodiment, the soluble material is magnesium aluminum alloy.
As an alternative embodiment, the thickness of the soluble material coating 5 is the difference between the radii of the plunger tube 1 and the plunger 4.
In an alternative embodiment, the monitoring device 6 is an ultrasonic distance meter.
The working process of the plunger self-positioning method is as follows:
putting into pipeline 1 with plunger 4 who sets up soluble material coating 5, opening monitoring instrument 6 and nitrogen gas injection device 7, the distance of monitoring instrument 6 real-time supervision plunger 4 and well head, nitrogen gas injection device 7 carries out nitrogen gas and injects into and makes plunger 4 pressurized whereabouts, monitors plunger whereabouts to the set distance when monitoring instrument 6, stops to inject nitrogen gas into, and soluble material coating 5 and connecting device 3 meet water and dissolve, and plunger 4 begins reciprocating work in the pipeline.
The foregoing is illustrative of the preferred embodiments of this invention, and it is to be understood that the invention is not limited to the precise form disclosed herein and that various other combinations, modifications, and environments may be resorted to, falling within the scope of the concept as disclosed herein, either as described above or as apparent to those skilled in the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.