CN108361006B

CN108361006B - Drainage and gas production process method adopting preset pneumatic pipe column

Info

Publication number: CN108361006B
Application number: CN201810194453.0A
Authority: CN
Inventors: 王旱祥; 车家琪; 张砚雯; 刘延鑫; 孙秉宇; 吴超; 王亚东
Original assignee: China University of Petroleum East China
Current assignee: China University of Petroleum East China
Priority date: 2018-03-09
Filing date: 2018-03-09
Publication date: 2023-05-23
Anticipated expiration: 2038-03-09
Also published as: CN108361006A

Abstract

The invention provides a drainage gas production process method adopting a preset pneumatic pipe column, which belongs to the technical field of natural gas exploitation, and adopts interference fit between an insertion sealing module and a preset sealing cylinder arranged on the inner wall of a sleeve to realize insertion sealing of the preset pneumatic pipe column, and automatically switches the gas production function and drainage gas production function of the preset pneumatic pipe column according to the relation between the bottom-hole effusion height of the gas production well and a preset height threshold value.

Description

Drainage and gas production process method adopting preset pneumatic pipe column

Technical Field

The invention relates to the technical field of natural gas exploitation, in particular to a drainage and gas exploitation process method adopting a preset pneumatic pipe column.

Background

With the rapid development of global economy, the demand of resources is increasing, the petroleum and natural gas resources which are praised as one of three energy sources are more in demand, and the way of searching for economic and effective development of petroleum and natural gas resources has become the subject of current oilfield development.

After the gas well is put into operation, the gas yield and the pressure of the gas well are reduced rapidly, so that the liquid carrying capacity of the gas well is insufficient, the number of liquid-gas-accumulating wells of the gas field is increased year by year along with the extension of the production time, the bottom-hole liquid accumulation is also serious, and the contradiction between the normal exertion of the gas well productivity and the solution of the liquid accumulation problem of a shaft is increasingly outstanding. The low productivity and high liquid accumulation of the gas well become key factors for restricting the production economy of the gas well, and the large-scale development of drainage and gas production becomes an effective means for solving the problem.

The main drainage measures at the present stage include foam drainage, concentric capillary technology, vortex drainage, coiled tubing drainage, natural gas continuous circulation, speed pipe column drainage, plunger gas lift, deep pumping drainage, inter-well interconnected shaft agitation drainage, multi-stage throttle valve mutual drainage, nitrogen injection, small-diameter pipe gas production, slim hole well drilling technology, preferably pipe column gas production, gas well deep drainage, electric submersible pump, jet pump, bubble drainage and other technologies, and the technology plays an important role in drainage gas production and drainage production of a liquid accumulation and production stopping gas well by virtue of the respective advantages, but the technology has the problems of complex operation, poor applicability, high technology cost, high energy consumption and the like. Therefore, development of a drainage and gas production process method which is simple to operate, wide in adaptability, low in process cost and low in energy consumption is needed.

Disclosure of Invention

Aiming at the problems, the invention provides a drainage and gas production process method adopting a preset pneumatic pipe column, and aims to provide the drainage and gas production process method which is simple to operate, wide in adaptability, low in process cost and low in energy consumption, and pollution to stratum in the drainage and gas production process can be reduced. The technical scheme provided by the invention is as follows:

the invention provides a drainage and gas production process method adopting a preset pneumatic pipe column, which comprises the following steps of:

installing a preset pneumatic pipe column in a gas production well, and realizing the insertion sealing of the preset pneumatic pipe column by adopting interference fit between an insertion sealing module and a preset sealing cylinder installed on the inner wall of a sleeve;

judging whether the bottom hole effusion height of the gas producing well is larger than a preset height threshold value or not;

if the bottom hole effusion height of the gas producing well is not greater than a preset height threshold value, starting a pneumatic reversing module to enable formation gas to enter the pneumatic reversing module, and then discharging the formation gas to a wellhead through an oil sleeve annulus so as to realize a gas production function;

and if the bottom hole effusion height of the gas producing well is larger than a preset height threshold value, switching the pneumatic reversing module to enable formation gas to enter the pneumatic reversing module, driving the gas-liquid pressurizing module to work, further discharging the formation gas to a wellhead through an oil sleeve annulus, and discharging the bottom hole effusion to the wellhead through an oil pipe so as to realize a drainage and gas production function.

Optionally, the preset pneumatic pipe column is installed in a gas production well, and the insertion seal of the preset pneumatic pipe column is realized by adopting the interference fit between the insertion seal module and the preset seal cylinder installed on the inner wall of the casing, specifically:

a preset pneumatic pipe column consisting of a gas-liquid pressurizing module, a pneumatic reversing module and an inserting sealing module is lowered to the bottom of a gas well by adopting an oil pipe, and a bottom well screen pipe of the preset pneumatic pipe column is inserted into a bottom accumulated liquid;

the rubber ring inserted into the sealing module is in interference fit with the sealing cylinder preset on the inner wall of the sleeve in advance through vulcanization, so that the insertion sealing of the preset pneumatic pipe column is realized.

Optionally, if the bottom-hole hydrops height of the gas producing well is not greater than a preset height threshold, the pneumatic reversing module is started to enable formation gas to enter the pneumatic reversing module, and then the formation gas is discharged to a wellhead through an oil sleeve annulus, so that a gas production function is realized, specifically:

if the bottom hole effusion height of the gas producing well is not more than a preset height threshold value, stratum high-pressure gas enters an oil sleeve annulus inserted below the sealing module through a plurality of perforation holes uniformly arranged in the middle of the sleeve;

stratum high-pressure gas entering an oil sleeve annulus inserted below the sealing module enters the pneumatic reversing module through a piston gas inlet of the pneumatic motor, the reversing valve core is driven to perform clearance reciprocating linear motion, the pneumatic reversing module is opened to enable stratum gas to enter the pneumatic reversing module, and then the stratum gas is discharged to a wellhead through the oil sleeve annulus, so that a gas production function is achieved.

Optionally, when the bottom hole effusion height of the gas producing well is greater than a preset height threshold, the pneumatic reversing module is switched to enable formation gas to enter the pneumatic reversing module, and the gas-liquid pressurizing module is driven to work, so that the formation gas is discharged to a wellhead through an oil sleeve annulus, and the bottom hole effusion is discharged to the wellhead through an oil pipe, so as to realize a drainage and gas production function, and the method specifically comprises the following steps:

if the bottom hole effusion height of the gas producing well is larger than a preset height threshold value, stratum high-pressure gas enters an oil sleeve annulus inserted below the sealing module through a plurality of perforation holes uniformly arranged in the middle of the sleeve;

part of stratum high-pressure gas entering an oil sleeve annulus below the inserted sealing module enters the pneumatic reversing module through a piston gas inlet of the pneumatic motor, and drives a reversing valve core to perform clearance reciprocating linear motion, so that a reversing function is realized;

the other part of stratum high-pressure gas entering the oil sleeve annulus inserted below the sealing module enters the gas-liquid pressurizing module through the power gas inlet and drives the pneumatic piston to do reciprocating linear motion, so as to drive the upper liquid piston and the lower liquid piston to do reciprocating linear motion;

the upper liquid piston makes reciprocating linear motion to suck the annular liquid of the oil sleeve inserted above the sealing module into the central pipe column through an annular liquid inlet, and then the annular liquid is discharged to the bottom of the well through a well screen pipe;

the lower liquid piston makes reciprocating linear motion to suck bottom-hole accumulated liquid into the central pipe column through the bottom-hole sieve tube;

the liquid sucked into the central pipe column is discharged to a wellhead through an oil pipe inserted above the sealing module so as to realize a drainage function;

stratum high-pressure gas entering the central pipe column through the pneumatic motor piston gas inlet and the power gas inlet is discharged to an oil sleeve annular space above the inserted sealing module through a spent power gas outlet after the reversing valve core and the pneumatic piston are driven, and stratum gas is discharged to a wellhead through the oil sleeve annular space, so that a gas production function is realized.

Optionally, the pneumatic reversing module drives the reversing valve core to perform clearance reciprocating linear motion, so as to realize reversing function, specifically:

stratum high-pressure gas enters the lower cavity of the pneumatic motor piston through the gas inlet of the pneumatic motor piston, and simultaneously, stratum high-pressure gas in the lower cavity of the pneumatic motor piston enters the upper cavity of the pneumatic motor piston through the gas channel at the side edge of the motor piston;

the pneumatic motor piston starts to move downwards from the top dead center under the action of the pressure difference force of stratum high-pressure gas, and drives the reversing piston which is coaxially and fixedly connected with the pneumatic motor piston to move downwards;

when the reversing piston moves to the bottom of the buffer cylinder, the reversing piston drives the buffer cylinder to continuously move downwards, and then the buffer cylinder drives the reversing valve core coaxially and fixedly connected with the buffer cylinder to move downwards, so that the reversing valve core is switched from an upper position to a lower position;

when the starting motor piston moves to the bottom dead center, the upper slot of the pneumatic motor piston connecting rod is communicated with the lower cavity of the pneumatic motor piston and the slide valve cavity, stratum high-pressure air enters the slide valve cavity through the upper slot of the pneumatic motor piston connecting rod, and the slide valve starts to move upwards from the bottom dead center under the action of pressure difference force generated by stratum high-pressure air;

when the slide valve moves to the top dead center, the slide valve blocks a channel between a lower cavity of the pneumatic piston and a side gas channel of the pneumatic motor piston, so that the pneumatic motor piston starts to move upwards from the bottom dead center under the action of pressure difference and drives the reversing piston to move upwards;

when the reversing piston moves upwards to the top of the buffer cylinder, the buffer cylinder is driven to move upwards, and the buffer cylinder drives the reversing valve core to move upwards, so that the reversing valve core is switched from the lower position to the upper position.

The invention has at least the following beneficial effects:

the invention provides a drainage and gas production process method adopting a preset pneumatic pipe column, which is characterized in that the preset pneumatic pipe column is arranged in a gas production well, the insertion sealing of the preset pneumatic pipe column is realized by adopting the interference fit between an insertion sealing module and a preset sealing cylinder arranged on the inner wall of a sleeve, the gas production function and the drainage and gas production function of the preset pneumatic pipe column are automatically switched according to the relation between the bottom-hole hydrops height of the gas production well and a preset height threshold value, the switching operation between the functions is automatic operation, the switching operation is simple and the function switching is timely, namely, the drainage and gas production process method is simple in operation, wide in adaptability and low in process cost, has lower energy consumption, and can also reduce the pollution to stratum in the drainage and gas production process.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.

FIG. 1 is a schematic flow chart of a drainage and gas production process method using a preset pneumatic pipe column according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a preset pneumatic pipe column according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a gas-liquid pressurizing module according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a gas-liquid pressurizing module according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a pneumatic reversing module according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a pneumatic reversing module according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of an insert seal module according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of an insert seal module according to an embodiment of the present invention.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

The terms "first," "second," "third," "fourth," "fifth," "sixth," "seventh," and "eighth" and the like in the description and in the claims and in the above figures, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented, for example, in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

The drainage and gas production process method adopting the preset pneumatic pipe column in the embodiment of the invention will be described in detail with reference to fig. 1 to 8.

Referring to fig. 1, a drainage and gas production process method adopting a preset pneumatic pipe column according to an embodiment of the invention includes:

step 110: and installing the preset pneumatic pipe column in the gas production well, and realizing the insertion sealing of the preset pneumatic pipe column by adopting the interference fit between the insertion sealing module and the preset sealing cylinder installed on the inner wall of the sleeve.

Referring to fig. 2, the preset pneumatic pipe column adopted in the embodiment of the invention comprises a sleeve 1, a sealing cylinder 2, a perforation 3, a gas-liquid pressurizing module 4, a pneumatic reversing module 5 and an inserting sealing module 6. The casing 1 is fixed on the inner wall of a gas well through a well cementation process, the preset sealing cylinder 2 is a cylindrical rubber ring, the groove at the upper position of the inner wall of the casing 1 is embedded in advance through vulcanization, the plurality of perforations 3 are uniformly arranged at the middle position of the casing 1, a central pipe column is fixedly connected with an upper oil pipe through threads from top to bottom sequentially through an inserting sealing module 6, a pneumatic reversing module 5 and a gas-liquid pressurizing module 4, an oil pipe joint 6.9 at the upper part of the central pipe column is fixedly connected with the upper oil pipe through threads, the rubber ring 6.5 in the inserting sealing module 6 is sealed with the preset sealing cylinder 2 through interference fit, and a bottom well screen pipe 4.17 at the bottom of the central pipe column is inserted into a bottom well effusion so as to realize the discharge of the bottom well effusion.

Referring to fig. 3 and 4, the gas-liquid pressurizing module 4 mainly includes a lower liquid piston 4.1, a bottom hole liquid flow channel middle section 4.2, an upper liquid piston 4.3, an integrated piston rod 4.4, a pneumatic piston 4.5, a flow channel switching plate 4.6, a pneumatic piston upper cylinder 4.7, a pneumatic piston middle cylinder 4.8, an annular liquid flow channel lower section 4.9, a pneumatic piston lower cylinder 4.10, a first one-way valve 4.11, a liquid piston upper cylinder 4.12, a liquid piston cylinder lower end cover 4.13, a second one-way valve 4.14, a liquid piston lower cylinder 4.15, a liquid piston cylinder cover 4.16, a bottom hole screen 4.17, a third one-way valve 4.18, a first bottom hole liquid flow channel lower section 4.19, a fourth one-way valve 4.20, a bottom hole liquid switching flow channel 4.21, a power gas channel lower section 4.22, a power gas channel lower section 4.23, a fifth one-way valve 4.24, a second bottom hole liquid flow channel lower section 4.25 and a sixth one-way valve 4.26.

The pneumatic reversing module 5 mainly comprises a first power gas channel upper section 5.1, a reversing cylinder 5.2, a second power gas channel upper section 5.3, a reversing cylinder end cover 5.4, a reversing valve core 5.5, a reversing valve core connecting rod 5.6, a buffer cylinder 5.7, a reversing piston 5.8, a reversing piston connecting rod 5.9, a sliding valve side gas channel 5.10, a sliding valve 5.11, a pneumatic motor piston side gas channel 5.12, a pneumatic motor piston cylinder 5.13, a pneumatic motor piston 5.14, a pneumatic motor piston connecting rod 5.15, a pneumatic motor piston connecting rod upper grooving 5.16, a pneumatic motor piston gas inlet 5.17, a pneumatic motor piston lower cylinder 5.18, a sliding valve upper cylinder end cover 5.19, a sliding valve lower cylinder sleeve 5.20, a sliding valve base 5.21, a pneumatic motor base 5.22, a buffer outer cylinder 5.23, a spent power gas exhaust channel 5.24, a buffer outer cylinder end cover 5.25, a reversing valve core channel 5.26, a power gas inlet 5.27, a pneumatic motor piston connecting rod upper part 5.28, a second power piston channel 5.28, a sliding valve piston upper grooving 5.35, a sliding valve piston cavity chamber bottom part, a sliding valve cavity chamber 35, a pneumatic motor piston upper grooving 5.35.

Referring to fig. 7 and 8, the insert seal module 6 is mainly composed of a spent gas pipe 6.1, an insert seal body 6.2, an insert seal lower end cap 6.3, an insert seal lower piston 6.4, a rubber ring 6.5, an insert seal upper piston 6.6, an insert seal upper end cap 6.7, a spent gas outlet 6.8, an oil pipe joint 6.9, an annular liquid pipe 6.10, an insert seal lower spring 6.11, an insert seal lower through hole 6.12, an insert seal upper through hole 6.13, an insert seal upper spring 6.14, an annular liquid inlet 6.15, and an insert seal housing 6.16.

Specifically, a preset pneumatic pipe column consisting of the gas-liquid pressurizing module 4, the pneumatic reversing module 5 and the inserting sealing module 6 is lowered to the bottom of a gas well by adopting an oil pipe, and a bottom well screen pipe of the preset pneumatic pipe column is inserted into a bottom liquid accumulation; then, the rubber ring 6.5 inserted into the sealing module 6 is in interference fit with the sealing cylinder 2 preset on the inner wall of the sleeve 1 in advance through vulcanization, so that the insertion sealing of the preset pneumatic pipe column is realized.

Step 120: judging whether the bottom hole effusion height of the gas producing well is larger than a preset height threshold value.

Specifically, a liquid level sensor is preset at the bottom of the well to detect the liquid level at the bottom of the well, so as to automatically judge whether the liquid level at the bottom of the gas well is greater than a preset height threshold value. The embodiment of the present invention is not limited specifically for setting the specific size of the preset height threshold. By way of example, the preset height threshold may be 1 meter.

Step 130: and if the bottom hole effusion height of the gas producing well is not greater than a preset height threshold value, starting the pneumatic reversing module to enable formation gas to enter the pneumatic reversing module, and then discharging the formation gas to a wellhead through an oil sleeve annulus so as to realize a gas production function.

Specifically, if the bottom hole effusion height of the gas producing well is not greater than a preset height threshold value, stratum high-pressure gas enters an oil sleeve annulus inserted below the sealing module through a plurality of perforation holes uniformly arranged in the middle of the sleeve; stratum high-pressure gas entering an oil sleeve annulus inserted below the sealing module enters the pneumatic reversing module through a piston gas inlet of the pneumatic motor, the reversing valve core is driven to perform clearance reciprocating linear motion, the pneumatic reversing module is opened to enable stratum gas to enter the pneumatic reversing module, and stratum gas is discharged to a wellhead through the oil sleeve annulus so as to achieve a gas production function.

Further, referring to fig. 2 to 8, if the bottom hole effusion height of the gas producing well is not greater than the preset height threshold, stratum high pressure gas enters an oil sleeve annulus inserted below the sealing module 6 through a plurality of perforations 3 uniformly arranged in the middle of the sleeve 1, stratum high pressure gas in the air of an oil sleeve ring inserted below the sealing module 6 enters the pneumatic reversing module 5 through a pneumatic motor piston gas inlet 5.17, and the reversing valve core 5.5 is driven to reciprocate in a linear mode, so that the pneumatic reversing module 5 is started to enable stratum gas to enter the pneumatic reversing module, and stratum gas is discharged to a wellhead through the oil sleeve annulus, so that a gas production function is realized.

Step 140: and if the bottom hole effusion height of the gas producing well is larger than a preset height threshold value, switching the pneumatic reversing module to enable formation gas to enter the pneumatic reversing module, driving the gas-liquid pressurizing module to work, further discharging the formation gas to a wellhead through an oil sleeve annulus, and discharging the bottom hole effusion to the wellhead through an oil pipe so as to realize a drainage and gas production function.

Specifically, if the bottom hole effusion height of the gas producing well is greater than a preset height threshold value, stratum high-pressure gas enters an oil sleeve annulus inserted below the sealing module through a plurality of perforation holes uniformly arranged in the middle of the sleeve; part of stratum high-pressure gas entering an oil sleeve annulus below the inserted sealing module enters the pneumatic reversing module through a piston gas inlet of the pneumatic motor, and drives a reversing valve core to perform clearance reciprocating linear motion, so that a reversing function is realized; the other part of stratum high-pressure gas entering the oil sleeve annulus inserted below the sealing module enters the gas-liquid pressurizing module through the power gas inlet and drives the pneumatic piston to do reciprocating linear motion, so as to drive the upper liquid piston and the lower liquid piston to do reciprocating linear motion; the upper liquid piston makes reciprocating linear motion to suck the annular liquid of the oil sleeve inserted above the sealing module into the central pipe column through an annular liquid inlet, and then the annular liquid is discharged to the bottom of the well through a well screen pipe; the lower liquid piston makes reciprocating linear motion to suck bottom hole accumulated liquid into the central pipe column through the bottom hole sieve tube; the liquid sucked into the central pipe column is discharged to a wellhead through an oil pipe inserted above the sealing module so as to realize a drainage function; stratum high-pressure gas entering the central pipe column through the pneumatic motor piston gas inlet and the power gas inlet is discharged to an oil sleeve annular space above the inserted sealing module through a spent power gas outlet after the reversing valve core and the pneumatic piston are driven, and stratum gas is discharged to a wellhead through the oil sleeve annular space, so that a gas production function is realized.

Further, stratum high-pressure gas enters the lower cavity of the pneumatic motor piston through the gas inlet of the pneumatic motor piston, and simultaneously stratum high-pressure gas enters the upper cavity of the pneumatic motor piston through the gas channel at the side edge of the motor piston; the pneumatic motor piston starts to move downwards from the top dead center under the action of the pressure difference force of stratum high-pressure gas, and drives the reversing piston which is coaxially and fixedly connected with the pneumatic motor piston to move downwards; when the reversing piston moves to the bottom of the buffer cylinder, the reversing piston drives the buffer cylinder to continuously move downwards, and then the buffer cylinder drives the reversing valve core coaxially and fixedly connected with the buffer cylinder to move downwards, so that the reversing valve core is switched from an upper position to a lower position; when the pneumatic motor piston moves to the bottom dead center, the upper slot of the pneumatic motor piston connecting rod is communicated with the lower cavity of the pneumatic motor piston and the slide valve cavity, stratum high-pressure air enters the slide valve cavity through the upper slot of the pneumatic motor piston connecting rod, and the slide valve starts to move upwards from the bottom dead center under the action of pressure difference force generated by stratum high-pressure air; when the slide valve moves to the top dead center, the slide valve blocks a channel between a lower cavity of the pneumatic piston and a side gas channel of the pneumatic motor piston, so that the pneumatic motor piston starts to move upwards from the bottom dead center under the action of pressure difference and drives the reversing piston to move upwards; when the reversing piston moves upwards to the top of the buffer cylinder, the buffer cylinder is driven to move upwards, and the buffer cylinder drives the reversing valve core to move upwards, so that the reversing valve core is switched from the lower position to the upper position.

Further, referring to fig. 2 to 8, if the bottom hole effusion height of the gas producing well is greater than a preset height threshold, stratum high-pressure gas enters an oil sleeve annulus inserted below the sealing module 6 through a plurality of perforations 3 uniformly arranged in the middle of the sleeve 1, stratum high-pressure gas in the oil sleeve air inserted below the sealing module 6 enters the pneumatic reversing module 5 through a pneumatic motor piston gas inlet 5.17, and the reversing valve core 5.5 is driven to reciprocate in a straight line mode, so that a reversing function is realized; stratum high-pressure gas entering the oil collar space below the inserted sealing module 6 enters the gas-liquid pressurizing module 4 through the power gas inlet 5.27, the pneumatic piston 4.5 is driven to do reciprocating rectilinear motion, so that the upper liquid piston 4.3 and the lower liquid piston 4.1 which are coaxially fixed with the pneumatic piston 4.5 are driven to do reciprocating rectilinear motion, the upper liquid piston 4.3 can suck annular liquid of the oil collar above the inserted sealing module 6 into a central column through the annular liquid inlet 6.15 and discharge the annular liquid to the bottom of a well through a bottom sieve tube 4.17, the lower liquid piston 4.1 can suck the accumulated liquid at the bottom of the well into the central column through the bottom sieve tube 4.17 and discharge the accumulated liquid at the top of the well through an oil tube above the inserted sealing module 6, and a drainage function is realized; stratum high-pressure gas entering the central pipe column through the pneumatic motor piston gas inlet 5.17 and the power gas inlet 5.27 is discharged to an oil sleeve annulus above the inserted sealing module 6 through the spent power gas outlet 6.8 after the reversing valve core and the pneumatic piston are driven, and is discharged to a wellhead through the oil sleeve annulus above the inserted sealing module 6, so that a gas production function is realized.

In addition, the preset pneumatic pipe column adopted by the drainage gas production process method adopting the preset pneumatic pipe column of the embodiment of the invention has the advantages that a plurality of side holes of the bottom screen pipe are uniformly arranged in the middle of the side surface of the bottom screen pipe 4.17, the side holes of the bottom screen pipe are through holes with a certain inclination angle, and the bottom effusion can form rotational flow when being sucked into the central pipe column through the bottom screen pipe 4.17, so that gravel in the bottom effusion is settled to the center of the bottom surface of the bottom screen pipe 4.17, and the gravel is discharged to the bottom of the well through the plurality of bottom screen pipe bottom holes uniformly arranged in the center of the bottom surface of the bottom screen pipe 4.17, thereby realizing the sand prevention function.

Referring to fig. 2 to 8, when the formation high-pressure gas enters from the lower section 4.23 of the second power gas channel, the formation high-pressure gas enters the lower chamber of the pneumatic piston 4.5 through the right lower through hole of the pneumatic piston 4.5, so as to push the pneumatic piston 4.5 to move upwards, further drive the upper liquid piston 4.3 and the lower liquid piston 4.1 coaxially fixed with the pneumatic piston 4.5 to move upwards, and the power-free gas in the upper chamber of the pneumatic piston 4.5 enters the lower section 4.22 of the first power gas channel through the left upper through hole of the pneumatic piston 4.5 and is discharged to the pneumatic reversing module 5.

Referring to fig. 2 to 8, as the upper liquid piston 4.3 moves upward, the spent power gas in the upper chamber of the upper liquid piston 4.3 enters the lower section 4.22 of the first power gas channel through the upper left through hole of the upper liquid piston 4.3 and is discharged to the pneumatic reversing module 5, the lower cavity of the upper liquid piston 4.3 forms a low pressure area, and the annular liquid above the second one-way valve 4.14 in the lower section 4.9 of the annular liquid flow channel enters the lower cavity of the upper liquid piston 4.3 through the lower right through hole of the upper liquid piston 4.3.

Referring to fig. 2 to 8, as the lower liquid piston 4.1 moves upward, the bottom liquid in the upper cavity of the lower liquid piston 4.1 enters the lower section 4.25 of the second bottom liquid flow channel through the upper right through hole of the lower liquid piston 4.1, then the bottom liquid in the upper cavity of the lower liquid piston 4.1 passes through the fifth one-way valve 4.24 and is discharged to the pneumatic reversing module 5 through the bottom liquid transfer flow channel 4.21, the lower cavity of the lower liquid piston 4.1 forms a low pressure area, and the bottom liquid enters the lower section 4.19 of the first bottom liquid flow channel through the bottom sieve tube 4.17 and the third one-way valve 4.18 and enters the lower cavity of the lower liquid piston 4.1 through the lower left through hole of the lower liquid piston 4.1.

Referring to fig. 2 to 8, when the formation high-pressure gas enters from the lower section 4.22 of the first power gas channel, the formation high-pressure gas enters the upper chamber of the pneumatic piston 4.5 through the upper left through hole of the pneumatic piston 4.5, so as to push the pneumatic piston 4.5 to move downwards, further drive the upper liquid piston 4.3 and the lower liquid piston 4.1 coaxially fixed with the pneumatic piston 4.5 to move downwards, and the power-free gas in the lower chamber of the pneumatic piston 4.5 enters the lower section 4.23 of the power gas channel B through the lower right through hole of the pneumatic piston 4.5 and is discharged to the pneumatic reversing module 5.

Referring to fig. 2 to 8, as the upper liquid piston 4.3 moves downward, annular liquid in the lower chamber of the upper liquid piston 4.3 enters the lower section 4.22 of the first power gas channel through the right lower through hole of the upper liquid piston 4.3, and is discharged to the bottom of the well through the second one-way valve 4.14 and the bottom screen 4.17, the upper cavity of the upper liquid piston 4.3 forms a low pressure area, high pressure gas in the lower section 4.22 of the first power gas channel enters the upper cavity of the upper liquid piston 4.3 through the left upper through hole of the upper liquid piston 4.3,

referring to fig. 2 to 8, as the lower liquid piston 4.1 moves downward, the bottom liquid in the lower cavity of the lower liquid piston 4.1 enters the lower section 4.19 of the first bottom liquid flow channel through the left lower through hole of the lower liquid piston 4.1, then the bottom liquid in the lower cavity of the lower liquid piston 4.1 passes through the fourth one-way valve 4.20 and is discharged to the pneumatic reversing module 5 through the bottom liquid transfer flow channel 4.21, the upper cavity of the lower liquid piston 4.1 forms a low pressure area, and the bottom liquid enters the lower section 4.25 of the second bottom liquid flow channel through the bottom sieve tube 4.17 and the sixth one-way valve 4.26 and enters the upper cavity of the lower liquid piston 4.1 through the right upper through hole of the lower liquid piston 4.1.

In particular, there are three pneumatic pistons 4.5 at the power end, one each for the lower liquid piston 4.1 and the upper liquid piston 4.3 at the hydraulic end, and the pneumatic piston area is larger than the liquid piston 4.1 and the upper liquid piston 4.3, so that the effective acting area of the pneumatic piston 4.5 at the power end is larger than the effective acting area of the lower liquid piston 4.1 and the upper liquid piston 4.3 at the hydraulic end, and the integral piston has the gas-liquid supercharging effect.

Referring to fig. 2 to 8, the air motor piston 5.14 is located at the top dead center initially, the stratum high pressure gas enters the lower cavity of the air motor piston 5.14 through the air motor piston gas inlet 5.17, meanwhile, the stratum high pressure gas enters the upper cavity of the air motor piston 5.14 through the air motor piston side gas channel 5.12, the total pressure acting on the upper surface of the air motor piston 5.14 is greater than the total pressure of the lower surface because the upper surface area of the air motor piston 5.14 is greater than the total pressure of the lower surface, the air motor piston 5.14 moves downwards from the top dead center, the air motor piston 5.14 moves downwards to drive the reversing piston 5.8 coaxially and fixedly connected with the air motor piston 5.14, when the reversing piston 5.8 moves to the bottom of the buffer cylinder 5.7, the reversing piston 5.8 continues to move downwards at the moment, the buffer cylinder 5.7 moves downwards to drive the valve core 5.5 coaxially and fixedly connected with the buffer cylinder 5.7 to move downwards, and the valve core 5.5.5 is switched from the upper reversing position to the lower position.

Referring to fig. 2-8, when the air motor piston 5.14 moves to the bottom dead center, the air motor piston rod upper slot 5.16 communicates the air motor piston 5.14 lower cavity and the slide valve chamber 5.33, the stratum high pressure gas enters the slide valve chamber 5.33 from the air motor piston 5.14 lower cavity through the air motor piston rod upper slot 5.16, the total pressure acting on the upper surface of the slide valve 5.11 is smaller than the total pressure of the lower surface because the upper surface area of the slide valve 5.11 is smaller than the lower surface area, the slide valve 5.11 moves upwards from the bottom dead center, when the slide valve 5.11 moves to the top dead center, the slide valve 5.11 blocks the passage between the air motor piston 5.14 lower cavity and the air motor piston side gas passage 5.12, meanwhile, the upper cavity of the pneumatic motor piston 5.14 is communicated with the lower cavity 5.32 of the slide valve base through the annular space in the middle of the pneumatic motor piston side gas channel 5.12 and the slide valve 5.11, the slide valve side gas channel 5.10 and the lower cavity 5.32 of the slide valve base, the lower cavity 5.32 of the slide valve base is communicated with the exhaust channel 5.24 of the spent power gas through the right lower through hole of the slide valve base 5.21, the spent power gas pressure is smaller than the stratum high pressure gas, under the action of pressure difference, the pneumatic motor piston 5.14 starts to move upwards from the bottom dead center, the pneumatic motor piston 5.14 moves upwards to drive the reversing piston 5.8 which is fixedly connected with the pneumatic motor piston 5.14 coaxially, when the reversing piston 5.8 moves to the top of the buffer cylinder 5.7, the reversing piston 5.8 drives the buffer cylinder 5.7 to continue to move upwards, and at the moment, the reversing valve core 5.5 which is fixedly connected with the buffer cylinder 5.7 coaxially moves upwards, the reversing valve core 5.5 is switched from the lower position to the upper position.

Referring to fig. 2 to 8, when the air motor piston 5.14 moves to the top dead center again, the slot 5.35 at the lower part of the air motor piston connecting rod is communicated with the slide valve chamber 5.33 and the slide valve base lower cavity 5.32, at this time, the upper surface of the slide valve 5.11 is still high-pressure stratum gas, the lower surface of the slide valve 5.11 is low-power gas, the pressure of the low-power gas is smaller than that of the high-pressure stratum gas, and under the action of pressure difference, the slide valve 5.11 moves from the top dead center to the bottom dead center, so that the air reversing function of one period is completed.

Referring to fig. 2-8, the upper part of the inserted sealing module 6 is fixedly connected with an oil pipe through threads, the middle part of the inserted sealing module 6 is sealed by interference fit of a plurality of uniformly arranged rubber rings 6.5 and a preset sealing cylinder 2, the preset sealing cylinder 2 is embedded on the inner wall of the sleeve 1 in advance through vulcanization, the inner diameter of the preset sealing cylinder 2 is smaller than that of the sleeve 1, the inserted sealing module 6 is conveniently inserted for sealing and positioning, and the lower part of the inserted sealing module 6 is fixedly connected with the pneumatic reversing module 5 through threads.

Further, referring to fig. 2 to 8, the gas-liquid channel mainly includes an annular liquid channel, a bottom hole product liquid channel and a gas channel; in the annular liquid flow passage, the annular liquid of the oil sleeve inserted above the sealing module 6 enters the annular liquid guide pipe 6.10 through the annular liquid inlet 6.15, then enters the upper annular liquid flow passage section 5.34 fixedly communicated with the annular liquid guide pipe 6.10 through threads, continuously enters the lower annular liquid flow passage section 4.9 communicated with the upper annular liquid flow passage section 5.34, and is discharged to the bottom of the well through the well screen 4.17.

Referring to fig. 2 to 8, in the bottom-hole effusion flow path, bottom-hole effusion enters the first bottom-hole effusion flow path lower section 4.19 and the second bottom-hole effusion flow path lower section 4.25 through the bottom-hole screen pipe 4.17, then the bottom-hole effusion enters the bottom-hole effusion flow path middle section 4.2 through the bottom-hole effusion transfer flow path 4.21, and then the bottom-hole effusion enters the bottom-hole effusion flow path upper section 5.31 through the bottom-hole effusion transfer flow path and is discharged to the wellhead through the oil pipe.

Referring to fig. 2 to 8, in the gas passage, when the reversing valve core 5.5 is located at the upper position, stratum high-pressure gas enters the central column through the power gas inlet 5.27 and enters the upper section 5.3 of the second power gas passage through the reversing valve core reversing passage 5.26, then stratum high-pressure gas enters the middle section 5.29 of the second power gas passage through the power gas reversing passage 5.30 and enters the lower section 4.23 of the second power gas passage through the flow passage switching passage, then stratum high-pressure gas enters the lower chamber of the pneumatic piston 4.5 through the side through hole of the pneumatic piston 4.5, thereby pushing the pneumatic piston 4.5 to move upwards, the spent power gas in the upper chamber of the pneumatic piston 4.5 enters the lower section 4.22 of the first power gas passage through the side through hole of the pneumatic piston 4.5 and enters the upper section 5.1 of the first power gas passage communicated with the lower section 4.22 of the first power gas passage, then enters the spent power gas discharge passage 5.24 through the reversing valve core reversing passage 5.26 and sequentially enters the lower section 4.23 of the second power gas discharge passage, and finally enters the lower chamber 6.5.5 through the power gas vent 6 and the gas outlet 6.8 and is inserted into the annular space above the sealing sleeve 6.

Referring to fig. 2 to 8, when the reversing valve 5.5 is located at the lower position, stratum high-pressure gas enters the central column through the power gas inlet 5.27 and enters the first power gas channel upper section 5.1 through the reversing valve reversing channel 5.26, stratum high-pressure gas enters the first power gas channel lower section 4.22 communicated with the first power gas channel upper section 5.1, stratum high-pressure gas enters the upper cavity of the pneumatic piston 4.5 through the side through hole of the pneumatic piston 4.5, so that the pneumatic piston 4.5 is pushed to move downwards, the power gas in the lower cavity of the pneumatic piston 4.5 enters the second power gas channel lower section 4.23 through the side through hole of the pneumatic piston 4.5 and enters the second power gas channel middle section 5.29 through the flow passage reversing channel, then the power gas enters the second power gas channel upper section 5.30 through the power gas reversing channel 5.3, enters the power gas exhaust channel 5.24 through the reversing valve reversing channel 5.26, then sequentially passes through the power gas exhaust duct 6.1 and the power gas outlet 6.8, and exits the power gas through the power gas outlet 6.8 to the annular space above the sealing sleeve 6, and the annular space above the sealing sleeve is inserted into the annular space.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.

Claims

1. The drainage and gas production process method adopting the preset pneumatic pipe column is characterized by comprising the following steps of:

the method comprises the steps that a preset pneumatic pipe column is installed in a gas production well, the preset pneumatic pipe column comprises a sleeve, a sealing cylinder, perforation, a gas-liquid pressurizing module, a pneumatic reversing module and an insertion sealing module, wherein the sleeve is fixed on the inner wall of the gas well through a well cementation process, the preset sealing cylinder is a cylindrical rubber ring and is embedded in a groove at the upper position of the inner wall of the sleeve in advance through vulcanization, a plurality of perforation holes are uniformly arranged at the middle position of the sleeve, the central pipe column is sequentially and fixedly connected with the insertion sealing module, the pneumatic reversing module and the gas-liquid pressurizing module through threads from top to bottom, and the insertion sealing of the preset pneumatic pipe column is realized through interference fit between the insertion sealing module and the preset sealing cylinder installed on the inner wall of the sleeve;

the inserted seal module mainly comprises a spent power gas conduit, an inserted seal body, an inserted seal lower end cover, an inserted seal lower piston, a rubber ring, an inserted seal upper piston, an inserted seal upper end cover, a spent power gas outlet, an oil pipe joint, an annular liquid conduit, an inserted seal lower spring, an inserted seal lower through hole, an inserted seal upper spring, an annular liquid inlet and an inserted seal shell;

the pneumatic reversing module mainly comprises a first power gas channel upper section, a reversing cylinder, a second power gas channel upper section, a reversing cylinder end cover, a reversing valve core connecting rod, a buffer cylinder, a reversing piston connecting rod, a slide valve side gas channel, a slide valve, a pneumatic motor piston side gas channel, a pneumatic motor piston cylinder, a pneumatic motor piston connecting rod, a slot on the upper part of the pneumatic motor piston connecting rod, a pneumatic motor piston gas inlet, a pneumatic motor piston lower cylinder, a slide valve upper cylinder sleeve, a slide valve lower cylinder sleeve, a slide valve base, a pneumatic motor base, a buffer outer cylinder, a spent power gas discharge channel, a buffer outer cylinder end cover, a reversing valve core reversing channel, a power gas inlet, a reversing cylinder, a second power gas channel middle section, a power gas reversing channel, a bottom effusion flow channel upper section, a slide valve base lower cavity, a slide valve cavity, a liquid flow channel upper section and a slot on the lower part of the pneumatic motor piston connecting rod;

the gas-liquid pressurizing module mainly comprises a lower liquid piston, a bottom-hole effusion flow channel middle section, an upper liquid piston, an integrated piston rod, a pneumatic piston, a flow channel conversion plate, a pneumatic piston upper cylinder, a pneumatic piston middle cylinder, an annular liquid flow channel lower section, a pneumatic piston lower cylinder, a first one-way valve, a liquid piston upper cylinder, a liquid piston cylinder lower end cover, a second one-way valve, a liquid piston lower cylinder, a liquid piston cylinder sealing cover, a bottom-hole sieve tube, a third one-way valve, a first bottom-hole effusion flow channel lower section, a fourth one-way valve, a bottom-hole effusion conversion flow channel, a power gas channel lower section, a fifth one-way valve, a second bottom-hole effusion flow channel lower section and a sixth one-way valve; judging whether the bottom hole effusion height of the gas producing well is larger than a preset height threshold value or not;

2. The drainage and gas production process method according to claim 1, wherein the preset pneumatic pipe column is installed in a gas production well, and the insertion sealing of the preset pneumatic pipe column is realized by adopting the interference fit between the insertion sealing module and the preset sealing cylinder installed on the inner wall of the casing, specifically:

3. The drainage and gas production process according to claim 1, wherein if the bottom hole liquid accumulation height of the gas producing well is not greater than a preset height threshold value, starting a pneumatic reversing module to enable formation gas to enter the pneumatic reversing module, and further discharging the formation gas to a wellhead through an oil jacket annulus to realize a gas production function, specifically:

4. The drainage and production process according to claim 1, wherein if the bottom hole effusion height of the gas producing well is greater than a preset height threshold value, switching the pneumatic reversing module to enable formation gas to enter the pneumatic reversing module, driving the gas-liquid pressurizing module to work, and further discharging the formation gas to a wellhead through an oil jacket annulus and discharging the bottom hole effusion to the wellhead through an oil pipe, so as to realize drainage and production functions, and specifically comprising:

5. The drainage and gas production process according to claim 4, wherein the pneumatic reversing module drives the reversing valve core to perform clearance reciprocating linear motion to realize a reversing function, and specifically comprises: