阅读说明：本技术 一种连通储层的功能管柱及其连通储层的方法 (functional pipe columns for communicating reservoirs and method for communicating reservoirs ) 是由 戴文潮 程光明 赵晨熙 赵建军 胡亮 田宗正 于 2018-07-18 设计创作，主要内容包括：本发明提出了一种连通储层的功能管柱及其连通储层的方法,该管柱包括：包括：套管、增产短节、支撑短节和分支管,其中包括若干相互连接的套管与支撑短节,最后一节套管连接最后一个支撑短节的一端,最后一个支撑短节的另一端连接增产短节,分支管从相互连接的套管和支撑短节中穿过,且所述分支管的两端构造成：分支管的末端连接到增产短节的斜向通孔内并朝向储层方向,在自然状况下分支管被限制伸出,在设定条件达到时分支管伸出沟通周边储层。该管柱可实现远距离、大范围、高效率地沟通缝洞型、孔洞型储层的目的,减少起下管柱次数,提高采油效率。(The invention provides functional pipe columns for communicating reservoirs and a method for communicating the reservoirs, wherein the pipe columns comprise a sleeve, a production increasing short section, a support short section and a branch pipe, wherein the sleeve and the support short section are connected with each other, the end of the last support short sections is connected with the casing pipes, the other end of the last support short sections is connected with the production increasing short section, the branch pipe penetrates through the sleeve and the support short section which are connected with each other, the two ends of the branch pipe are constructed in a way that the tail end of the branch pipe is connected into an oblique through hole of the production increasing short section and faces the direction of the reservoirs, the branch pipe is limited to extend out under the natural condition, and the branch pipe extends out to communicate with the peripheral reservoirs when the set condition is reached.)

The utility model provides a function tubular column of kind intercommunication reservoir stratum, its characterized in that includes sleeve pipe, production increase nipple, support nipple and lateral pipe, including a plurality of mutual connected sleeve pipes and support nipple, the sleeve pipe is connected with the end of the last support nipples finally, the other end of the last support nipples is connected with the production increase nipple, the lateral pipe passes through in the sleeve pipe and the support nipple that connect each other, and the both ends of lateral pipe construct, the terminal of lateral pipe is connected to the slant through-hole of production increase nipple and towards the reservoir stratum direction, the lateral pipe is restricted to stretch out under natural conditions, the lateral pipe stretches out and communicates peripheral reservoir stratum when the settlement condition reaches.

2. The string of claim 1, wherein the support sub and the casing are connected by a cooperating threaded arrangement and tubing buckle.

3. A pipe string as claimed in claim 1 or 2, wherein the end of the support nipple is provided with a th internal thread for connection, the other end of the support nipple is provided with an external thread for connection, and the inner side of the end close to the th internal thread of the support nipple is further provided with a clamping support assembly for clamping and supporting the branch pipe.

4. The string of claim 3, wherein the gripping and support assembly comprises a gripping sleeve and a support sleeve, the gripping sleeve is connected with a second internal thread arranged in the support nipple, the diameter of the second internal thread is smaller than that of the th internal thread, the end of the support sleeve abuts against the gripping sleeve, and the other end of the support sleeve abuts against an internal shoulder of the support nipple.

5. The pipe string as claimed in claim 4, wherein a convex ring is arranged in the middle of the outer surface of the support sleeve, bearings are sleeved on annular concave parts on two sides of the convex ring, and the support sleeve abuts against the inner surfaces of the clamping sleeve and the support short section through the bearings.

6. A pipe string according to claim 4 or 5, wherein four channels for the passage of branch pipes are provided in the middle of the support sleeve, and the four channels are evenly distributed in the support sleeve.

7. The column according to any of claims 4 to 6, wherein the lateral tubes are mounted in a support jacket and a soluble spacer pin is attached to the beginning of the lateral tubes.

8. The string of any of claims 1-7, wherein the branching tube terminates in a tip comprising:

a nozzle connected to the branch pipe;

the sealing assembly is connected between the tail end of the branch pipe and the inner wall of the yield increasing short section where the inclined through hole is located in a sealing mode;

the nut compression ring is connected in the oblique through hole of the yield increasing short section; and

and the soluble limiting ring is arranged between the nut pressing ring and the sealing assembly.

A method of accessing a reservoir of the species , the method comprising the steps of:

connecting and running a functional string as claimed in any of claims 1-8 into a well;

pumping acid liquor into the pipe column, and dissolving a soluble limiting pin arranged at the starting end of the branch pipe and a soluble limiting ring arranged in the end head of the tail end of the branch pipe to realize pressure building in the pipe;

and pumping and injecting acid liquor continuously to enable the branch pipe to extend out of the target reservoir stratum and communicate with the reservoir stratum near the wellbore.

10. The method of claim 9, wherein when the lower depth position of the stimulation sub reaches the target reservoir position, pumping acid solution into the pipe, the acid solution causes the acid release valve at the bottom of the completion pipe string to close, the soluble spacing ring at the tail end of the branch pipe and the soluble spacing pin at the beginning end to dissolve, the branch pipe loses restraint, pumping acid solution continuously, and when the pressure in the pipe reaches , the branch pipe extends out of the reservoir near the communication shaft under the action of hydraulic traction formed by the nozzle.

Technical Field

The invention relates to the technical field of petroleum downhole completion tools, in particular to functional pipe columns for communicating reservoirs and a method for communicating the reservoirs.

Background

Although the perforation process, tools and methods are greatly improved, the problem of pollution caused by compaction belts of the perforation to a reservoir cannot be overcome, the effective permeability of the reservoir is greatly reduced, and the crude oil production is extremely unfavorable.

Patent 200610001128.5, patent 201110096631.4 disclose high pressure water jet deep penetration and auxiliary fracturing methods and devices for the methods, the devices punch small holes in a casing and a stratum through a piston, a wedge and a punch, then convey a jet hose into the small holes, inject clean water into the ground, and perform simultaneous jet rock breaking and extend into the stratum by means of a self-propelled nozzle.

Disclosure of Invention

Aiming at part or all of the technical problems in the prior art, the invention provides functional pipe columns for communicating reservoirs and a method for communicating the reservoirs, which can achieve the purpose of communicating fracture-cavity type and hole type reservoirs in a long-distance, large-range and high-efficiency manner, reduce the times of pulling out the pipe columns and improve the oil extraction efficiency.

In order to achieve the purpose, , the invention provides functional pipe columns for communicating reservoirs, which comprise casings, a production increasing short section, a support short section and a branch pipe, wherein the casings and the support short section are connected with each other, the last casing is connected with ends of the last support short sections, the other ends of the last support short sections are connected with the production increasing short section, the branch pipe penetrates through the casings and the support short sections which are connected with each other, the two ends of the branch pipe are configured in a way that the tail end of the branch pipe is connected into an oblique through hole of the production increasing short section and faces the direction of the reservoir, the branch pipe is limited to extend out under the natural condition, and the branch pipe extends out of the reservoir to communicate with the surrounding reservoir when the set condition is achieved.

The tail end of the branch pipe is connected to the production-increasing short section, and when the set conditions are reached, the branch pipe can extend out of the communication reservoir stratum, because the extension length of the branch pipe can extend under the pressure and spray is formed within the range of , the branch pipe can communicate with the reservoir stratum around the fracture-cavity type reservoir stratum and the hole-cavity type reservoir stratum in a long-distance, large-range and high-efficiency mode, after the fracture-cavity type reservoir stratum and the hole-cavity type reservoir stratum are communicated, the effective exploitation can be carried out, the oil extraction efficiency is improved, meanwhile, the exploitation purpose can be achieved by entering the pipe column times, and the times of pulling out the pipe column are reduced.

In embodiments, the support sub and the casing are connected by cooperating thread structures and tubing buckles.

In , the end of the prop nipple is provided with a th internal thread for connection, the other end of the prop nipple is provided with an external thread for connection, and the inner side of the end of the prop nipple close to the th internal thread is also provided with a clamping and supporting assembly for clamping and supporting the branch pipe.

In , the clamping and supporting assembly comprises a clamping sleeve and a supporting sleeve, the clamping sleeve is connected with a second internal thread arranged in the supporting short section, the diameter of the second internal thread is smaller than that of the th internal thread, the end of the supporting sleeve abuts against the clamping sleeve, and the other end of the supporting sleeve abuts against the internal shoulder of the supporting short section.

In , a convex ring is arranged in the middle of the outer surface of the support sleeve, bearings are sleeved on annular concave parts on two sides of the convex ring, and the support sleeve abuts against the inner surfaces of the clamping sleeve and the support short section through the bearings.

In the preferred embodiments, four channels for the branch pipes are provided in the middle of the support sleeve, and the four channels are uniformly distributed in the support sleeve.

In embodiments, the branch pipe is installed in a support sleeve, and a soluble stop pin is connected to the beginning of the branch pipe.

In the preferred embodiments, the method comprises,

the end of lateral pipe is equipped with the end, the end includes:

a nozzle connected to the branch pipe;

the sealing assembly is connected between the tail end of the branch pipe and the inner wall of the yield increasing short section where the inclined through hole is located in a sealing mode;

the nut compression ring is connected in the oblique through hole of the yield increasing short section; and

and the soluble limiting ring is arranged between the nut pressing ring and the sealing assembly.

In another aspect, the present invention also provides methods of communicating reservoirs, the method comprising the steps of:

connecting the functional pipe strings and then putting the functional pipe strings into the well;

pumping acid liquor into the pipe column, and dissolving a soluble limiting pin arranged at the starting end of the branch pipe and a soluble limiting ring arranged in the end head of the tail end of the branch pipe to realize pressure building in the pipe;

and pumping and injecting acid liquor continuously to enable the branch pipe to extend out of the target reservoir stratum and communicate with the reservoir stratum near the wellbore.

In embodiments, when the lower deep position of the production increasing nipple reaches the target reservoir position, pumping acid liquor into the pipe, wherein the acid liquor causes the acid release valve at the bottom of the well completion pipe column to be closed, the soluble spacing ring at the tail end of the branch pipe and the soluble spacing pin at the beginning end to be dissolved, the branch pipe loses restraint, pumping acid liquor continuously, and when the pressure in the pipe reaches fixed value, the branch pipe extends out of the reservoir near the communication shaft under the action of hydraulic traction formed by the nozzle.

Compared with the prior art, the invention has the advantages that:

1) the branch pipe is a hose like, and is preset in a functional pipe column, and is driven into the well to the reservoir position along with the completion pipe column , and times of pipe column complete the operations of perforation, branch pipe extension and remote reservoir communication, so that the efficiency is high and the cost is low.

2) The functional pipe column can be changed according to the length of the branch pipe, so that the purpose of reservoir communication in different length ranges is achieved, and the reservoir communication range is large.

3) Four branch pipes can be preset in the functional pipe column and are symmetrically distributed, and when the pump injects acid liquor, the four branch pipes lose restraint at the same time, so that the four branch pipes are pricked into the reservoir at different angles, the communication area is large, and the effect is good.

Drawings

Preferred embodiments of the present invention will be described in detail below with reference to the attached drawing figures, wherein:

FIG. 1 is a schematic structural diagram of embodiments of the present invention in a functional string;

FIG. 2 is a schematic structural diagram of the connection part of the stimulation nipple and the branch pipe in FIG. 1;

FIG. 3 is an enlarged partial view A of the end of the branch pipe of FIG. 2, with the branch pipe in a natural state;

FIG. 4 is an enlarged partial view A' of the end of the branch pipe of FIG. 3, with the branch pipe in an extended position;

FIG. 5 is a schematic structural diagram of the support nipple in FIG. 1;

FIG. 6 is a schematic view of a partial structure of the end of the lateral pipe engaged with the short bracing segment;

FIG. 7 is a schematic cross-sectional view of a support nipple after installation of the lateral pipe.

In the drawings, like parts are provided with like reference numerals. The figures are not drawn to scale.

Detailed Description

In order to make the technical solutions and advantages of the present invention more apparent, is described in detail below with reference to the accompanying drawings, it is obvious that the described embodiments are only a part of embodiments of the present invention, not an exhaustive list of all embodiments, and features in embodiments and embodiments of the present invention may be combined with each other without conflict.

The inventor notices in the invention process that the existing method for deeply penetrating the transmission hole and assisting fracturing through high-pressure water jet has limited rock-breaking effect by spraying, and the operation is complicated because a pipe column needs to be lifted and lowered for corresponding construction for many times when the hole is drilled.

In view of the above disadvantages, the embodiment of the present invention provides functional strings for connecting reservoirs and a method for using the same, which will be described in detail below.

FIG. 1 shows a schematic structural diagram of embodiments of the functional string for communicating reservoirs of the present invention, in which the functional string for communicating reservoirs mainly comprises a stimulation sub 4, a branch pipe 3 and a plurality of interconnected casings 1 and support sub 2, wherein the casings 13 are connected to ends of the final support sub 23, and the other ends of the final support sub 23 are connected to the stimulation sub 4. the branch pipe 3 sequentially passes through the interconnected casings 1 and support sub 2, and the end 300 of the branch pipe 3 is connected to the oblique through hole 41 of the stimulation sub 4 and faces the reservoir direction. in addition, both ends of the branch pipe 3 are configured to block the extension of the branch pipe 3 under natural conditions, and extend the branch pipe 3 out to communicate with the reservoir when set conditions are reached.

In embodiments, as shown in fig. 1, at least two or more casing pipes 1 and support subs 2 are included, the structure of the functional pipe string and the interconnection between the components are illustrated below by taking a functional pipe string including three casing pipes 1 and three support subs 2 as an example, the upper end of the th casing pipe 11 is connected with the pipe string 6 through external threads, the lower end of the th casing pipe 11 is connected with the internal threads at the upper end of the th support subs 21 through external threads, the external threads at the lower end of the th support subs 21 are connected with the upper end of the middle casing pipe 12 through a tubing buckle 5, the tubing buckle 5 is connected with the casing pipes 1 and the support subs 2 through either threads or welding, the lower end of the middle casing pipe 12 is connected with the support subs 22 through a tubing buckle and the last th oil pipe 13, the lower end of the last th oil pipe 23 is connected with the last support subs 23 through threads, and the last support subs 23 is connected with the internal threads of the stimulation subs.

In embodiments, as shown in fig. 5 and 6, each support nipple 2 comprises a nipple body 200, the end of the nipple body 200 is provided with a th internal thread 201 for connecting the casing 1, the other end of the nipple body 200 is provided with an external thread 202 for connection, and the inner side of the nipple body 200 close to the end of the th internal thread 201 is also provided with a clamping and supporting assembly for clamping and supporting the branch pipe 3.

In embodiments, as shown in fig. 5 and 6, the clamping support assembly mainly comprises a clamping sleeve 203 and a support sleeve 204, wherein the clamping sleeve 203 and the second internal thread of the support nipple 2 form a fastening structure through threaded connection, and the diameter of the second internal thread is smaller than that of the th internal thread 201, so that the clamping sleeve 203 can be conveniently placed into the nipple body 200 and the support sleeve 204 can be limited, the end of the support sleeve 204 abuts against the clamping sleeve 203, and the other end of the support sleeve 204 abuts against an internal shoulder of the nipple body 200 of the support nipple 2.

In preferred embodiments, as shown in fig. 5 and 6, a convex ring is provided in the middle of the outer surface of the support sleeve 204, bearings 205 are sleeved on annular recesses on both sides of the convex ring, the support sleeve 204 abuts against the clamping sleeve 203 and the inner surface of the nipple body 200 of the support nipple 2 through the bearings 205, the clamping sleeve 203 and the support sleeve 204 are provided in the support nipple 2 mainly for supporting and restraining the branch pipe 3 in the pipe, and the bearings 205 are provided to increase the flexibility of the support nipple 2, so that even if the branch pipe is rotated by a force, the branch pipe 3 is not directly clamped by the support sleeve 204, but can be rotated, thereby not causing damage to the branch pipe 3.

In embodiments, as shown in fig. 1, 6 and 7, the middle of the support sleeve 204 is provided with four channels for four branch pipes to pass through, the four channels are uniformly distributed in the support sleeve 204 (as shown in fig. 7), the four branch pipes 3 respectively pass through the channels, the structure of the support sleeve 204 can prevent the four branch pipes 3 from winding and interfering with each other, and after the branch pipes 3 are installed in the support sleeve 204, the ends of the branch pipes 3 are connected with soluble limiting pins 7, the soluble limiting pins 7 play a role of limiting the movement of the branch pipes 3 in the process of putting the functional pipe string into the well in the natural state, so as to ensure that the branch pipes 3 do not slip off due to self-gravity in the process of lowering the pipe string, when acid solution is pumped into the pipe in the operation process, the soluble limiting pins 7 dissolve in the acid solution environment, the tail parts of the branch pipes 3 lose restraint, and can extend under the hydraulic traction action of the front end nozzle 302 (the front end is the end of the branch pipes 3).

In embodiments, the end 300 of the branch pipe is connected in the oblique through hole 41 on the production nipple 4 and faces the reservoir direction, here, the production nipple 4 plays a role of supporting the end 300 of the branch pipe 3, four oblique through holes 41 are distributed on the production nipple 4 in an axially uniform distribution structure, in a preferred embodiment of step , the oblique through hole 41 forms an included angle of 15-60 degrees with the axial direction of the functional pipe column, when the angle is larger, in order to prevent the influence of the reaction force of the fluid in the branch pipe 3 on the production nipple 4, the connection structure arranged between the end 300 of the branch pipe and the production nipple 4 can be considered to prevent the influence caused by the reaction force.

In embodiments, as shown in fig. 3, the end 300 of the branch pipe mainly comprises a nozzle 302, a sealing assembly 301, a nut pressing ring 304 and a soluble limiting ring 303, wherein the end of the branch pipe 3 is provided with the nozzle 302 by welding or screwing, the sealing assembly 301 is sleeved outside the branch pipe 3 and exceeds the plane of the nozzle 302, the sealing assembly 301 is arranged between the branch pipe 3 and the inner wall of the inclined through hole 41 of the stimulation pup joint 4, the sealing assembly 301 mainly realizes the sealing of the annular space between the outer wall of the branch pipe 3 and the stimulation pup joint 5, ensures that all liquid in the inner cavity of the stimulation pup joint 5 can only be sprayed out through the branch pipe 3 and the nozzle 302 at the front end, the soluble limiting ring 303 at the front end of the nozzle 302 is designed and fixed by the nut pressing ring 304, the soluble limiting ring 303 is abutted between the nut 304 and the sealing assembly 302, the pressing ring nut 304 is screwed in the inclined through hole 41 of the stimulation pup joint 4 to limit the soluble limiting ring 303, and the soluble limiting ring 303 prevents the branch pipe 4 and the nozzle pressing ring 302 from protruding out of the.

In embodiments, as shown in fig. 4, after pumping acid solution into the functional string, the soluble stop pin 7 and the soluble stop ring 303 are gradually dissolved in the acid solution environment, the branch pipe 3 and the nozzle 302 at the front end thereof are out of the block and extend outwards under the hydraulic traction of the nozzle 9 to communicate with the reservoir near the wellbore.

In another aspect, the invention also provides methods for communicating reservoirs, the methods using a functional string as described above and comprising the steps of:

connecting the pipe columns and then putting the pipe columns into the position of a reservoir in the well;

pumping acid liquor into the pipe column, and dissolving a soluble limiting pin 7 arranged at the front end of the branch pipe 3 and a soluble limiting ring 303 arranged in an end head 300 of the branch pipe 3 to realize pressure building in the pipe column;

and pumping acid liquor continuously so that the branch pipe 3 extends out of the reservoir near the communication well bore.

In embodiments, the whole functional string is connected and then lowered into the well as part of the completion string, when the deep position under the stimulation nipple 4 reaches the target reservoir position, acid liquid is pumped into the pipe, which causes the acid release valve ( check valves on the completion, normally open, release and close after encountering acid) at the bottom of the completion string to close, the soluble spacing ring 303 at the front end of the branch pipe 3 and the soluble spacing pin 7 at the tail end dissolve, the branch pipe 3 loses constraint, then the pressure in the pipe is suppressed, and the branch pipe 3 extends out to communicate with the reservoir near the wellbore under the hydraulic traction formed by the nozzle 302 when the pressure in the pipe reaches fixed value.

In embodiments, after the depth position of the production-increasing short section in the functional pipe column reaches a target reservoir, acid liquid is pumped into the ground, acid fluid is sprayed out from a nozzle 302 at the front end of a branch pipe 3( is a hose) to carry out hydraulic jet, pore-forming is realized under the combined action of acid liquid corrosion and hydraulic jet, the branch pipe loses restraint in an acid liquid environment, and four branch pipes all extend out and penetrate into the reservoir under the action of hydraulic traction, so that the aim of communicating a fracture-cavity type reservoir layer and a hole-type reservoir layer in a long-distance, large-range and high-efficiency manner is achieved, and the recovery ratio of an oil.

Having thus described the preferred embodiments of the present invention, additional variations and modifications of these embodiments may occur to those skilled in the art upon learning of the basic inventive concepts .