阅读说明：本技术 连续油管压裂与井下节流生产一体化工艺管柱及其方法 (Coiled tubing fracturing and downhole throttling production integrated process pipe column and method thereof ) 是由 姜勇 刘汉斌 张宏福 刘锐 马得华 杨旭东 张安康 张家富 仵海龙 任发俊 于 2020-05-19 设计创作，主要内容包括：本发明公开了一种连续油管压裂与井下节流生产一体化工艺管柱,包括连续油管、剪切丢手、套管接箍定位器、水力喷射器、封隔器、滑套座、液压投放工具及井下节流器；所述连续油管通过连接器与液压丢手连接,剪切丢手下端连接有套管接箍定位器,套管接箍定位器下端连接有水力喷射器,水力喷射器下端连接有封隔器,封隔器下端连接有滑套座,滑套座下端连接有液压投放工具,液压投放工具下端连接有井下节流器。本发明克服气井早期无法进行井下节流的缺点,可以大幅降低气井早期成本,提高早期井筒气流的携液能力,达到增产的效果。(The invention discloses a coiled tubing fracturing and downhole throttling production integrated process pipe column which comprises a coiled tubing, a shearing release, a casing collar positioner, a hydraulic ejector, a packer, a sliding sleeve seat, a hydraulic throwing tool and a downhole throttling device, wherein the coiled tubing is connected with the casing collar positioner through a hydraulic oil pipe; the continuous oil pipe is connected with a hydraulic release through a connector, the lower end of the shearing release is connected with a casing coupling positioner, the lower end of the casing coupling positioner is connected with a hydraulic ejector, the lower end of the hydraulic ejector is connected with a packer, the lower end of the packer is connected with a sliding sleeve seat, the lower end of the sliding sleeve seat is connected with a hydraulic throwing tool, and the lower end of the hydraulic throwing tool is connected with an underground throttle. The invention overcomes the defect that the gas well can not be subjected to underground throttling at the early stage, can greatly reduce the early cost of the gas well, improves the liquid carrying capacity of the gas flow of the early shaft and achieves the effect of increasing the yield.)

1. A coiled tubing fracturing and downhole throttling production integrated process pipe column is characterized by comprising a coiled tubing (1), a shearing release (3), a casing collar positioner (4), a hydraulic ejector (5), a packer (6), a sliding sleeve seat (7), a hydraulic throwing tool (8) and a downhole throttling device (9); coiled tubing (1) is connected with hydraulic pressure release (3) through connector (2), cuts release (3) lower extreme and is connected with casing coupling locator (4), and casing coupling locator (4) lower extreme is connected with hydraulic ejector (5), and hydraulic ejector (5) lower extreme is connected with packer (6), and the packer lower extreme is connected with sliding sleeve seat (7), and sliding sleeve seat (7) lower extreme is connected with hydraulic pressure and puts in instrument (8), and hydraulic pressure is put in instrument (8) lower extreme and is connected with downhole flow controller (9).

2. The coiled tubing fracturing and downhole throttling production integrated process string of claim 1, wherein: the hydraulic ejector is internally provided with a sliding sleeve.

3. The coiled tubing fracturing and downhole throttling production integrated process string of claim 2, wherein: the hydraulic ejector further comprises a first steel ball, the first steel ball can fall along the process pipe column, and the first steel ball drives the inner sliding sleeve of the hydraulic ejector (5) to fall into the sliding sleeve seat (7) and stop falling.

4. The coiled tubing fracturing and downhole throttling production integrated process string of claim 3, wherein: the diameter of the first steel ball is 16.5 mm.

5. The coiled tubing fracturing and downhole throttling production integrated process string of claim 3, wherein: the hydraulic injector further comprises a second steel ball, the second steel ball can fall along the process pipe column, and the second steel ball drives the inner sliding sleeve of the hydraulic injector (5) to fall into the hydraulic throwing tool (8) and stop falling.

6. The coiled tubing fracturing and downhole throttling production integrated process string of claim 5, wherein: the diameter of the second steel ball is 12.5 mm.

7. The coiled tubing fracturing and downhole throttling production integrated process string and method thereof according to claim 1, wherein: the packer (6) is a K344 packer.

8. A method of producing an integrated process string using coiled tubing fracturing and downhole throttling according to claim 6, comprising the steps of:

1) firstly, a well is flushed, a pipe column is put in, a casing collar positioner (4) is used for positioning, a hydraulic ejector (5) is aligned to a first section of designed perforation position, a first steel ball is thrown, and when the first steel ball drives an inner sliding sleeve of the hydraulic ejector (5) to fall to a sliding sleeve seat (7), the hydraulic ejector (5) is started to work;

2) injecting perforating fluid from the coiled tubing (1), and performing sand blasting and perforating;

3) after the perforation is finished, closing the casing gate, controlling the discharge capacity of the continuous oil pipe, and performing a rupture test:

if the layer is broken, continuing the subsequent construction;

if the fracture is unsuccessful, continuing perforating or injecting acid liquid until the layer is fractured;

4) after the stratum is fractured, injecting fracturing fluid from the oil and the sleeve ring, and simultaneously keeping the continuous oil pipe injecting base fluid;

5) after the fracturing is finished at the first section, lifting the fracturing pipe column to the designed perforation position of the second section, and repeating the steps 2) -4) to finish the fracturing construction of all subsequent construction sections;

6) after construction is finished, the first steel ball is discharged to the ground through formation pressure, then the coiled tubing fracturing and downhole throttling production integrated process tubular column is lifted to a straight well section, and liquid drainage treatment is carried out through an oil sleeve annulus;

7) after liquid drainage is finished, the underground throttler (9) is lifted to the position required by design, then a second steel ball is thrown, when the second ball falls onto the hydraulic throwing tool (8), liquid pressure is added, releasing and setting of the underground throttler (9) are realized, and finally the residual pipe column is pulled out.

Technical Field

The invention belongs to the technical field of oil and gas field fracturing, and particularly relates to a coiled tubing fracturing and downhole throttling production integrated process pipe column and a method thereof, which are suitable for directional wells and vertical wells for casing completion.

Background

The underground throttling technology is based on the underground throttler to realize the throttling and pressure reduction of a shaft and utilizes the process principle of ground temperature heating. The technology is comprehensively popularized and applied in the Suliger gas field, and practices prove that the technology has the advantages of reducing cost, effectively preventing hydrate from forming, improving liquid carrying production capacity of a gas well and the like.

At present, the widely-used slip type underground throttleer is conveyed into a designed position in a well through a well testing steel wire, is positioned by a slip, and utilizes a rubber cylinder to seal an annular space between the inner wall of an oil pipe and a device body. Because the formation pressure is too high in the initial production stage of the gas well, the underground throttle is difficult to drag to a specified position by means of a well testing steel wire, and the construction risk is high, so that the underground throttle is started after the formation pressure is reduced to a certain degree after a period of production. In the initial production stage, in order to match a medium-low pressure gas collection mode, a heating throttling device and an alcohol injection device are generally required to be used at a single-well mouth, so that the cost of an early gas well is greatly increased; and because no underground throttling exists, the liquid carrying capacity of an early gas well is poor, and the productivity of the gas well is influenced.

Disclosure of Invention

The invention aims to provide a coiled tubing fracturing and downhole throttling production integrated process pipe column and a method thereof, overcomes the defect that downhole throttling cannot be performed in the early stage of a gas well, can greatly reduce the early cost of the gas well, improve the liquid carrying capacity of early shaft gas flow, and achieve the effect of increasing the yield.

In order to achieve the above object, the present invention provides the following technical solutions.

A coiled tubing fracturing and downhole throttling production integrated process pipe column comprises a coiled tubing, a shearing release, a casing coupling positioner, a hydraulic ejector, a packer, a sliding sleeve seat, a hydraulic throwing tool and a downhole throttling device; the continuous oil pipe is connected with a hydraulic release through a connector, the lower end of the shearing release is connected with a casing coupling positioner, the lower end of the casing coupling positioner is connected with a hydraulic ejector, the lower end of the hydraulic ejector is connected with a packer, the lower end of the packer is connected with a sliding sleeve seat, the lower end of the sliding sleeve seat is connected with a hydraulic throwing tool, and the lower end of the hydraulic throwing tool is connected with an underground throttle.

As a further improvement of the invention, the hydraulic ejector is internally provided with a sliding sleeve.

As a further improvement of the invention, the hydraulic ejector further comprises a first steel ball, wherein the first steel ball can fall along the process pipe column, and the first steel ball drives an inner sliding sleeve of the hydraulic ejector to fall into the sliding sleeve seat and stop falling.

As a further improvement of the invention, the diameter of the first steel ball is 16.5 mm.

As a further improvement of the invention, the hydraulic injector further comprises a second steel ball, wherein the second steel ball can fall along the process pipe column, and the second steel ball drives the inner sliding sleeve of the hydraulic injector to fall into the hydraulic throwing tool and stop falling.

As a further improvement of the invention, the diameter of the second steel ball is 12.5 mm.

As a further improvement of the invention, the packer is a K344 packer.

The method for producing the integrated process pipe column by adopting the coiled tubing fracturing and downhole throttling comprises the following steps:

1) firstly, performing well cleaning operation, putting a pipe column, positioning by a casing collar positioner, aligning a hydraulic ejector to a first section of designed perforation position, throwing a first steel ball, and starting the hydraulic ejector when the first steel ball drives an inner sliding sleeve of the hydraulic ejector to fall to a sliding sleeve seat;

2) injecting perforating fluid from the coiled tubing, and performing sand blasting and perforating;

3) after perforation, closing the casing gate, controlling the discharge capacity of the continuous oil pipe, and performing a rupture test; if the layer is broken, continuing the subsequent construction, and if the layer is not broken successfully, continuing perforating or injecting acid liquid until the layer is broken;

4) after the stratum is fractured, injecting fracturing fluid from the oil and the sleeve ring, and simultaneously keeping the continuous oil pipe injecting base fluid;

5) after the fracturing is finished at the first section, lifting the fracturing pipe column to the designed perforation position of the second section, and repeating the steps 2) -4) to finish the fracturing construction of all subsequent construction sections;

6) after construction is finished, the first steel ball is discharged to the ground through formation pressure, then the coiled tubing fracturing and downhole throttling production integrated process tubular column is lifted to a straight well section, and liquid drainage treatment is carried out through an oil sleeve annulus;

7) after liquid drainage is finished, the underground throttler is lifted to the position required by design, then a second steel ball is thrown, when the second ball falls onto a hydraulic throwing tool, hydraulic pressure is added, releasing and setting of the underground throttler are achieved, and finally the remaining pipe column is pulled out.

Compared with the prior art, the invention has the following beneficial effects:

the invention adopts the structure that a coiled tubing, a shearing release, a casing collar locator, a hydraulic ejector, a K packer, a sliding sleeve seat, a hydraulic throwing tool and an underground restrictor are connected in sequence to form an integrated process pipe column; after liquid drainage is finished, the underground throttle is set at a designated position by using the fracturing pipe column, so that early underground throttling of the gas well can be realized, on one hand, the early cost of the gas well is greatly reduced, on the other hand, the liquid carrying capacity of early shaft airflow is improved, and the effect of increasing the yield is achieved. The underground throttle is set by utilizing the fracturing pipe column hydraulic pressure, the setting is reliable, the underground throttle does not need to be put in again in the production process of the gas well, and the putting cost is reduced.

Furthermore, the hydraulic ejector is provided with an inner sliding sleeve for plugging the pore passage in the drilling process, the inside and the outside are not communicated, the throttling pressure difference cannot be generated, and the K344 packer cannot be set in advance in the drilling process.

Drawings

The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes, the proportional sizes, and the like of the respective members in the drawings are merely schematic for facilitating the understanding of the present invention, and do not specifically limit the shapes, the proportional sizes, and the like of the respective members of the present invention. Those skilled in the art, having the benefit of the teachings of this invention, may choose from the various possible shapes and proportional sizes to implement the invention as a matter of case. In the drawings:

FIG. 1 is a schematic structural view of a coiled tubing fracturing and downhole throttling production integrated process string of the present invention.

In the figure, 1, a continuous oil pipe, 2, a connector, 3, a hydraulic release, 4, a casing collar locator, 5, a hydraulic ejector, 6, a packer, 7, a sliding sleeve seat, 8, a hydraulic throwing tool and 9, a downhole choke.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.

It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a single embodiment.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.