阅读说明：本技术 一种高矿化度气井井下除垢工具以及除垢方法 (High-salinity gas well underground descaling tool and descaling method ) 是由 李辰 宋汉华 陈晓刚 汪雄雄 李在顺 李丽 樊莲莲 于 2019-09-12 设计创作，主要内容包括：本发明公开一种高矿化度气井井下除垢工具,包括：本体,本体的前部的侧壁上设置有前刮垢区,前刮垢区设置有多个刮片,刮片呈圆盘形,本体中部的侧壁上设置刷垢区,刷垢区上周向均匀设置有钢丝刷。本发明还公开一种高矿化度气井井下除垢方法,包括：S001：往气井油管中预先放置缓冲器；S002：将本体放入气井油管中,通过本体上的刮片破碎气井油管的内壁上的硬垢,通过钢丝刷清除气井油管的内壁上的软垢；S003：当钢丝刷堵塞后与气井油管内壁形成密封结构,本体在气压下向上运动,直至被推出气井油管；S004：清理本体上的污垢后,再次将本体下放到气井油管中；S005：重复S002、S003和S004中的步骤,直至本体不会向上运动,再将本体打捞出气井油管。(The invention discloses a high-salinity gas well underground descaling tool, which comprises: the dirty district is scraped before being provided with on the lateral wall of the anterior part of body, and preceding dirty district of scraping is provided with a plurality of doctor-bars, and the doctor-bar is the disc, sets up on the lateral wall at body middle part and brushes dirty district, brushes dirty district and evenly is provided with the wire brush in circumference. The invention also discloses a method for removing scale of the high-salinity gas well underground, which comprises the following steps: s001: a buffer is placed in advance in an oil pipe of a gas well; s002: putting the body into an oil pipe of a gas well, breaking hard scale on the inner wall of the oil pipe of the gas well through a scraping blade on the body, and removing soft scale on the inner wall of the oil pipe of the gas well through a steel wire brush; s003: when the steel wire brush is blocked, a sealing structure is formed between the steel wire brush and the inner wall of the oil pipe of the gas well, and the body moves upwards under the air pressure until the steel wire brush is pushed out of the oil pipe of the gas well; s004: after cleaning up the dirt on the body, lowering the body into the oil pipe of the gas well again; s005: and repeating the steps in the S002, S003 and S004 until the body cannot move upwards, and fishing out the oil pipe of the gas well from the body.)

1. A hypersalinity gas well downhole descaling tool, comprising: the multifunctional cleaning tool comprises a body (1), wherein the body (1) is cylindrical, a conical head (2) is arranged at the front end of the body (1), a front dirt scraping area (110) is arranged on the side wall of the front portion of the body (1), a plurality of scraping sheets (3) are arranged in the front dirt scraping area (110), the scraping sheets (3) are disc-shaped, a dirt brushing area (120) is arranged on the side wall of the middle portion of the body (1), and steel wire brushes (4) are uniformly arranged on the dirt brushing area (120) in the circumferential direction.

2. A highly mineralized gas well downhole descaling tool according to claim 1, wherein the plurality of wiper blades (3) on the leading wiper zone (110) increase in diameter from front to back.

3. A hypersalinity gas well downhole descaling tool according to claim 1, characterized in that a rear descaling area (130) is provided on the side wall of the rear portion of the body (1), and a plurality of said wiper blades (3) are provided on the rear descaling area (130).

4. A highly mineralized gas well downhole descaling tool according to claim 3, wherein the plurality of wiper blades (3) on the rear wiping area (130) have a diameter that gradually increases from rear to front.

5. A highly mineralized gas well downhole descaling tool according to any one of claims 1 to 4, characterized in that the wiper blade (3) is of one-piece construction with the body (1).

6. A highly mineralized gas well downhole descaling tool according to claim 1, wherein the wire brushes (4) are distributed in multiple layers in the axial direction over the descaling area (120).

7. A highly mineralized gas well downhole descaling tool according to claim 1, wherein the descaling area (120) is provided with an annular mounting groove, a descaling element is assembled in the annular mounting groove, and the wire brush (4) is fixed on the descaling element.

8. A highly mineralized gas well downhole descaling tool according to claim 7, wherein the wiper comprises arc-shaped wiper blades, and the wire brush (4) is fixed on the outer side wall of each arc-shaped wiper blade, and the arc-shaped wiper blades surround a cylinder in the mounting groove.

9. A highly mineralized gas well downhole descaling tool according to claim 1, wherein the rear end of the body (1) is provided with a fishing head (5), and the end face of the fishing head (5) is provided with a blind necking hole (501).

10. A method of descaling a highly mineralized gas well downhole using the highly mineralized gas well downhole descaling tool according to any one of claims 1 to 9, comprising the steps of:

s001: a buffer is placed in advance in an oil pipe of a gas well;

s002: putting the body into an oil pipe of a gas well, enabling the body to freely fall in the oil pipe of the gas well under the action of self gravity, breaking hard scale on the inner wall of the oil pipe of the gas well through a scraping blade on the body, and removing soft scale on the inner wall of the oil pipe of the gas well through a steel wire brush;

s003: when the hard scale and the soft scale accumulated on the steel wire brush and the inner wall of the gas well oil pipe gradually form a sealing structure, the body starts to move upwards under the air pressure in the gas well oil pipe until the body is pushed to the upper port of the gas well oil pipe, and once scale cleaning is finished;

s004: taking out the body, cleaning dirt on the body, and then lowering the body into the oil pipe of the gas well again;

s005: and repeating the steps in the S002, S003 and S004 until the body cannot move upwards, fishing out the oil pipe of the gas well from the body, and finishing cleaning.

Technical Field

The invention belongs to the field of oil and gas well scale removal, and particularly relates to a high-salinity gas well underground scale removal tool and a scale removal method.

Background

With the continuous development of gas fields, the scaling phenomenon of different degrees exists in part of gas well production strings, and scaling/corrosion commonly coexist. The corrosion product film and scale deposit on the inner wall of the oil pipe and mainly has the following hazards: 1. the friction resistance of the shaft is increased, so that the pressure drop of the shaft is increased, the productivity of the gas well is restricted, and the ultimate recovery ratio of the gas well is influenced; 2. galvanic couple and under-deposit corrosion can be generated, and the service life of the tubular column is reduced; 3. resulting in a reduced diameter wellbore and increased risk of sticking during downhole operations. The prior common methods for cleaning the scale of the shaft mainly comprise: chemical descaling, mechanical scraping, mechanical drilling and milling, hydraulic descaling and the like. Chemical descaling is corrosive to metals and is also substantially ineffective for barium-strontium scale and wells with large scale formation. The mechanical scraping and the mechanical drilling and milling descaling precision is difficult to control, the pipe wall is easy to damage, the blockage is easy to occur, and the construction period is long. The pure water jet flow descaling is not suitable for hard scale (carbonate and sulfate), and the scale removed is large, so that the blockage of the continuous oil pipe or a tool is caused. The traditional method for cleaning the scale of the shaft system cannot meet the scale cleaning requirement of a gas well shaft on a production field.

Disclosure of Invention

In view of the above, it is an object of the present invention to provide a highly mineralized gas well downhole descaling tool and descaling method that overcome, or at least partially solve or alleviate, the above-mentioned problems.

The invention provides a high-salinity gas well underground descaling tool, which comprises: the scraper comprises a body, the body is cylindrical, the front end of the body is provided with a conical head, a front dirt scraping area is arranged on the side wall of the front portion of the body, a plurality of scraping blades are arranged on the front dirt scraping area, the scraping blades are disc-shaped, a dirt brushing area is arranged on the side wall of the middle portion of the body, and steel wire brushes are uniformly arranged on the dirt brushing area in the circumferential direction.

The highly mineralized gas well downhole descaling tool of the invention also has the following optional features:

optionally, the diameter of the plurality of blades on the front scraping area gradually increases from front to back.

Optionally, a rear descaling area is arranged on the side wall of the rear part of the body, and the rear descaling area is provided with a plurality of scraping blades.

Optionally, the diameter of the plurality of blades on the rear scraping area gradually increases from rear to front.

Optionally, the wiper blade is of integral construction with the body.

Optionally, the wire brushes are distributed in multiple layers in the axial direction on the brushing area.

Optionally, the dirt brushing area is provided with an annular mounting groove, a dirt brushing piece is assembled in the mounting groove, and the steel wire brush is fixed on the dirt brushing piece.

Optionally, the cleaning member includes arc-shaped brush pieces, the wire brush is fixed on an outer side wall of each of the arc-shaped brush pieces, and the arc-shaped brush pieces are enclosed into a cylindrical shape in the mounting groove.

Optionally, the rear end of the body is provided with a fishing head, and the end face of the fishing head is provided with a reducing blind hole.

The invention also provides a method for removing scale of the high-salinity gas well underground, which comprises the following steps:

s001: a buffer is placed in advance in an oil pipe of a gas well;

s002: putting the body into an oil pipe of a gas well, enabling the body to freely fall in the oil pipe of the gas well under the action of self gravity, breaking hard scale on the inner wall of the oil pipe of the gas well through a scraping blade on the body, and removing soft scale on the inner wall of the oil pipe of the gas well through a steel wire brush;

s003: when the hard scale and the soft scale accumulated on the steel wire brush and the inner wall of the oil pipe gradually form a sealing structure, the body starts to move upwards under the air pressure in the oil pipe of the gas well until the body is pushed to the upper port of the oil pipe of the gas well, and once scale cleaning is finished;

s004: taking out the body, cleaning dirt on the body, and then lowering the body into the oil pipe of the gas well again;

s005: and repeating the steps in the steps S002, S003 and S004 until the body cannot be pushed to the upper port of the gas well oil pipe, fishing out the body from the gas well oil pipe, and finishing cleaning.

The invention has the beneficial effects that:

the invention relates to a high-salinity gas well downhole descaling tool and a descaling method, which are characterized in that a scraping blade and a steel wire brush on a body are used for removing hard scale and soft scale on the inner wall of a gas well oil pipe, then the steel wire brush is blocked by the hard scale and the soft scale to form a sealing structure with the inner wall of the oil pipe, and the body is pushed upwards to the upper port of the oil pipe under the pressure of gas in the gas well oil pipe. Along with clearance and input many times to the body, the dirt in the oil pipe is finally cleared up, and it can to fish out the body from oil pipe at last. The structure is simple, the use is convenient, the blocking is not easy to happen, and the device can be used in a production field.

Drawings

FIG. 1 is a schematic overall configuration of one embodiment of a hypersaline gas well downhole descaling tool of the present invention;

fig. 2 is a partial structural view of fig. 1.

In the above figures: 1. a body; 110. a front descaling area; 120. a dirt brushing area; 130. a rear scraping area; 2. a conical head; 3. scraping a blade; 4. a wire brush; 5. fishing the head; 501: and (4) necking blind holes.

The present invention will be described in further detail with reference to the accompanying drawings and examples.

Detailed Description