RU2751619C1 - Sublevel filling tool for horizontal borehole, sublevel water control tool, and method for sublevel filling and sublevel water control - Google Patents

Abstract

FIELD: mining.SUBSTANCE: invention relates to the technical field of well completion. In particular, proposed is a sublevel filling tool for a horizontal borehole, consisting of a filling tool (100), multiple bypass sieve pipes (300), and a bypass packer (200) connected between any two adjacent bypass sieve pipes (300). The bypass sieve pipes (300) are therein tightly connected with the bypass packer (200), and the filling tool (100) is tightly connected with the uppermost bypass sieve pipe (300) and additionally comprises a filling servicing tool (400). The filling servicing tool (400) is therein located in the filling tool (100) and is equipped with a switching tool (410) for sealing the bypass packer (200), and said filling servicing tool (400) is configured to be removed from the filling tool (100). Also proposed are a sublevel water control tool including said sublevel filling tool for a horizontal borehole and a method for sublevel filling and sublevel water control.EFFECT: expanded range of technical means of ensuring successful completion of the operation of filling formation sections in a horizontal borehole.8 cl, 8 dwg

Description

FIELD OF TECHNOLOGY

The present invention relates to the technical field of well completion, and in particular to a sublevel filling tool for a horizontal well, a sublevel water control tool, and a method for sublevel filling and control of sublevel water.

KNOWN TECHNOLOGY

When completing horizontal open-hole wells while drilling, large sections of mudstone are often encountered at the pipe shoe. Block fall, well shrinkage, and wellbore collapse due to mudstone build-up easily lead to failure of the gravel pack operation in the entire open hole horizontal well.

Therefore, providing a sublevel filling tool for a horizontal well, a sublevel water control tool, and a sublevel filling and sublevel water control method that enable normal filling operations are an important technical problem to be solved by those skilled in the art.

SUMMARY OF THE INVENTION

The present invention provides a sublevel filling tool for a horizontal well, a sublevel water control tool, and a sublevel water filling and sublevel water control method to eliminate the technical problem that the fill operation was unsuccessful in the prior art.

In a first aspect, the present invention provides a pipe string for

level filling, including a filling tool, a plurality of bypass sieve pipes and a bypass packer connected between any two adjacent bypass sieve pipes, while the bypass sieve pipes are hermetically connected to the bypass packer; and the filling tool is sealed to the uppermost bypass sieve tube.

With respect to the first aspect, in a possible implementation, the level fill string further includes a fill service tool.

In this case, the filling service tool is located in the filling tool, and the filling service tool is equipped with a switching tool for sealing the bypass packer.

With respect to the first aspect, in a possible implementation, the lower part of the lowest bypass sieve pipe is connected to the seal port of the anti-hydraulic seal, and during the filling operation, the seal hole of the anti-hydraulic seal can be sealed to the filling service tool.

With regard to the first aspect, in a possible implementation, the bottom of the anti-hydraulic seal opening is connected to the casing shoe to prevent filling sand in the oil well annulus from entering the oil pipe.

With regard to the first aspect, in a possible implementation, the bypass packer bypass is in communication with the bypass sieve pipe.

With respect to the first aspect, in a possible implementation, the outer wall of the filling tool is provided with an anchor portion.

In a second aspect, the present invention further provides a water level control pipe string including a water control assembly and the aforementioned level fill pipe string;

the complete water control unit is located in the level filling pipe string.

With regard to the second aspect, in a possible implementation, the water control unit assembly includes a plurality of groups of water control units, and any two adjacent groups of water control units are connected by

sealing rod;

a sealing rod located in the bypass packer can be sealed to the bypass packer, and a sealing rod located in the seal bore of the anti-hydraulic seal can be sealed to the seal bore of the anti-hydraulic seal.

In a third aspect, the present invention further provides a water level filling and level control method comprising the steps of:

connecting the bypass packers to the bypass sieve tubes to form the tool string, connecting the attached tool string to the filling tool and carrying out preparatory work;

filling operation;

after filling is complete, placement of the pipe string for level control of the water;

Installing the water level control tubing at the top of the fill tool and performing a seal between the water level control tubing and the bypass packer and the seal port of the anti-hydraulic seal.

With regard to the third aspect, in a possible implementation, preparatory work includes installing the filling service tool and sealing the filling tool, unlocking for disconnecting the filling service tool from the filling tool, and lifting the filling service tool; After lifting the fill service tool, open the bypass packer seal pressure transmission channel with the switch tool on the fill service tool to seal the bypass packer.

Beneficial effects:

A sublevel filling tool for a horizontal well in accordance with the present invention includes a tool

infills, a plurality of bypass sieve pipes and a bypass packer connected between any two adjacent bypass sieve pipes, while the bypass sieve pipes are hermetically connected to the bypass packer; and the filling tool is sealed to the upper bypass sieve tube.

In operation, the bypass packer is sealed to form an oil well annulus layer and fill fluid is injected into the uppermost annulus through the filling tool; the fill fluid can fill the upper annulus of the oil well and can pass through the bypass packer bypass to fill the oil well annulus of the next layer. When a sand bridge appears in the annulus of the oil well, the fill fluid can bypass the sand bridge from the bypass sieve to continue filling the annular space of the oil well for normal filling operation.

A sublevel water control tool in accordance with the present invention comprises a water control assembly and a sublevel filling tool for a horizontal well; while the water control unit is assembled in the sublevel filling tool for the horizontal well. Compared to the prior art, the sublevel water control tool has the aforementioned advantages which are not repeated here.

The method for filling a sublevel and controlling water in a sublevel in accordance with the present invention includes the following steps: connecting bypass packers to bypass sieve tubes to form a tool string, connecting the attached tool string to a filling tool, placing a filling tool and a tool for servicing the filling in place, and then holding

preparatory work; filling operation; removing the tool for servicing the filling after filling is completed; placement of the water control tool in the sub-floor; Aligning the fixture and sealing insert at the top of the sublevel water control tool to a position at the top of the fill tool and performing a seal between the sublevel water control tool and the bypass packer and the seal bore of the anti-hydraulic seal. Compared to the prior art, the method for filling the sublevel and controlling the water in the sublevel has the aforementioned advantages, which are not repeated here.

BRIEF DESCRIPTION OF DRAWINGS

In order to describe in more detail the technical solutions in specific implementations of the present invention or the prior art, the accompanying drawings necessary to describe specific implementations or the prior art are briefly presented below. Obviously, the accompanying drawings in the following description show only some implementations of the present invention, and a person with ordinary knowledge in the art can obtain other accompanying drawings from these accompanying drawings without creative effort.

FIG. 1 is a schematic illustration of a sub-level fill tool for a horizontal well prior to a fill operation in accordance with an example of the present invention;

FIG. 2 is a schematic illustration of a sub-level fill tool for a horizontal well after a fill operation in accordance with an example of the present invention;

FIG. 3 is a schematic illustration of a sub-level fill tool for a horizontal well after a fill operation in accordance with an example of the present invention after retrieval.

filling service tool;

FIG. 4 is a schematic diagram of a sub-level water monitoring tool in accordance with an example of the present invention;

FIG. 5 is a schematic illustration of a fill service tool in a sub-level fill tool for a horizontal well in accordance with an example of the present invention;

FIG. 6 is a schematic illustration of a water control unit assembly in a sub-level water control tool in accordance with an example of the present invention;

FIG. 7 is a schematic illustration of a sealing rod in a sub-level water control tool in accordance with an example of the present invention; and

FIG. 8 is a schematic illustration of an anti-hydraulic seal seal opening in a sub-level water control tool in accordance with an example of the present invention.

Legend:

100: fill tool;

200: bypass packer; 210: bypass channel;

300: bypass sieve tube; 310: bypass channel;

400: tool for filling maintenance; 410: switching tool;

500: anti-hydraulic seal hole; 510: first pressure transmission port; 520: second pressure transmission port; 530: plugging piston; 540: pressure transmission channel;

600: casing shoe;

700: complete water control unit; 701: water control system element; 710a: sealing rod; 710b: sealing rod; 710c: sealing rod; 720: sealing element.

DETAILED DESCRIPTION

The following is a clear and complete description of the technical solutions of the present invention with reference to the accompanying drawings. It is obvious that the described examples are only some, and not all, examples of the present invention. All other examples obtained by one of ordinary skill in the art based on the examples of the present invention without creative effort fall within the scope of the patent protection of the present invention.

In the context of the description of the present invention, it should be understood that the orientation or positional relationship, denoted by the terms "top", "bottom", "front", "back", "top", "bottom", "inside / inside", "outside / outside "Etc., are orientation or positional relationship as shown in the drawings, and these terms are used to facilitate describing the present invention and simplify description, but not to indicate or imply that said device or elements should have a particular orientation and should be installed and must be operated in a specific orientation, and thus these terms should not be construed as limiting the present invention.

In addition, terms such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly indicating the number of specified technical features. Thus, features defined by the terms “first” and “second” may explicitly or implicitly include one or more features. In the description of the present invention, "plurality" means two or more, unless specifically specified otherwise.

In the present invention, unless otherwise indicated or defined, terms such as "linked / linked to" and "(for) fixed" are to be understood broadly. For example, these terms can be understood as

a rigid connection, a free connection, or a connection as a whole; or mechanical connection; either a direct connection, or an indirect connection through an intermediate means, or may involve an internal connection between two elements or an interconnected relationship between two elements. One of ordinary skill in the art can understand the specific meanings of the above terms in the present invention based on a particular situation.

The following is a further detailed description of the present invention with reference to specific examples and accompanying drawings.

With reference to FIG. 1, 2 and 3, this example represents a sublevel filling tool for a horizontal well that includes a fill tool 100, a plurality of bypass sieve tubes 300, and a bypass packer 200 connected between any two adjacent bypass sieve tubes 300, with bypass sieve tubes 300 tightly connected to the bypass packer 200; and the filling tool 100 is sealed to the uppermost bypass sieve tube 300.

In operation, the bypass packer 200 is sealed to form an oil well annulus layer and fill fluid is injected into the uppermost annulus through the filling tool 100; the fill fluid can fill the uppermost oil well annulus and can pass through the bypass 210 of the bypass packer 200 to fill the oil well annulus of the next layer. When a sand bridge appears in the oil well annulus, the fill fluid can bypass the sand bridge from the bypass sieve pipe 310 to continue filling the oil well annulus for normal filling operation.

By connecting the 300 bypass sieve tube to the 200 bypass packer

a bypass channel can be provided between them so that the multilevel filling operation is completed by passing the filling fluid through the sand bridge, and the packer is in the filling operation. The negative impact of the sand bridge on the filling effect can be reduced or even eliminated by positioning the bypass sieve tube 300.

It should be noted that the oil well annulus is the annular space between the inner wall of the oil well and the bypass sieve pipe 300.

It should also be noted that the designs of the filling tool 100, bypass packer 200, and bypass sieve tube 300 are similar to those of the filling tool, bypass packer and bypass sieve tube used in the technical field of oilfield exploitation in the prior art, therefore they are not described again.

With reference to FIG. 1, 2 and 5, in the optional solution of this example, the horizontal well sublevel filling tool further includes a filling service tool 400, where the filling service tool 400 is located in the filling tool 100, and the filling service tool 400 is provided with a switching tool 410 for sealing bypass packer 200.

In particular, the filling service tool 400 and the filling tool 100 interact to complete the placement and filling and other operations of the filling tool 100. After the filling service tool 400 completes the sealing and sealing test of the filling tool 100, a worker throws a ball into the service tool fill 400, and the fill service tool 400 is lifted. In this case, the switching tool 410 located on the outer wall of the fill service tool 400 can drive the sliding sleeve in the bypass packer 200 such that the seal liquid injection hole in the bypass packer 200 is unlocked and the bypass packer 200 can complete the operation. sealing under the influence of fluid pressure.

It should be noted that the fill maintenance tool 400 is a prior art tool for servicing an oil well fill, and no specific construction thereof has been provided. In addition, those skilled in the art can select different bypass packers 200 according to the actual situation. Various switching tools 410 are located on the outer wall of the fill service tool 400, and when the fill service tool 400 is lifted, the opening of the bypass packer 200 is opened to inject a sealing liquid to allow the bypass packer 200 to be sealed.

Specifically, the switching tool 410 may be attached to the outer wall of the fill service tool 400, be positioned on the outer wall of the fill service tool 400 in threaded mode, or may be glued or welded to the outer wall of the fill service tool 400.

With reference to FIG. 1 and 2, in the optional solution of this example, the bottom of the lowest bypass sieve pipe 300 is connected to the seal port of the anti-hydraulic seal 500, and during the filling operation, the seal hole of the anti-hydraulic seal 500 may be sealed to the filling service tool 400.

In particular, when the fill service tool 400 is buried, the bottom of the fill service tool 400 forms a seal with the seal hole of the anti-hydraulic seal 500 to prevent filling liquid from entering the screen tube, i. E. to prevent the filling fluid carrying the filling material from entering the sieve pipe through the annulus between the filling service tool 400 and the seal hole of the anti-hydraulic seal 500 and to prevent the filling fluid from returning (the annular space between the sieve pipe and the filling service tool 400 communicates with the channel return of filling fluid).

In addition, after the filling operation is completed, the worker needs to lift the filling service tool 400, but when lifting the filling service tool 400, a pressure difference occurs between the upper and lower space of the seal hole of the anti-hydraulic seal 500 (the space under the seal hole of the anti-hydraulic seal 500 represents an enclosed space, and when the opening of the seal of the anti-hydraulic seal 500 is raised, the volume of the enclosed space increases, thereby reducing the pressure in the enclosed space; however, the space above the seal of the anti-hydraulic seal 500 is in communication with external atmospheric pressure, therefore, when the opening is raised seal of the anti-hydraulic seal 500, a pressure difference occurs between the upper and lower space of the seal hole of the anti-hydraulic seal 500). This pressure difference adversely affects the operator's lifting of the fill maintenance tool 400. By positioning the seal hole of the anti-hydraulic seal 500, the pressure difference can be eliminated by communicating the top and bottom spaces of the seal hole of the anti-hydraulic seal 500.

It should be noted that the structure of the seal hole of the anti-hydraulic seal 500 is the same as that of the seal hole of the anti-hydraulic seal used in the oil well field in the prior art, and the specific structure is no longer repeated.

With reference to FIG. 1, 2 and 3, in the optional solution of this example, the bottom of the seal opening of the anti-hydraulic seal 500 is connected to the casing shoe 600 to prevent filling sand from the oil well annulus into the oil pipe.

In particular, the casing shoe 600 can prevent filling sand from entering between the sieve pipe and the inner wall of the oil well into the sieve pipe.

It should be noted that the construction of the casing shoe 600 is the same as the prior art casing shoe 600, and the specific construction is no longer repeated. As shown in FIG. 1, in the optional solution of this example, the bypass 210 of the bypass packer 200 communicates with the bypass 310 of the bypass sieve 300.

In particular, during a filling operation, fill fluid may enter the bypass 310 of the bypass sieve tube 300 and then flow downward along the bypass channel 310 of the bypass sieve tube 300. The fill fluid may bypass the sand bridge blocked outside the bypass channel of the sieve tube 300 from the bypass channel 310 and then flow into the annulus between the bypass sieve 300 and the inner wall of the oil well or into the bypass 210 of the bypass packer 200, thereby passing through the bypass packer 200 to continue the top-down filling operation.

In an optional solution of this example, the outer wall of the filling tool 100 is provided with an anchor portion.

In particular, the anchor portion can secure the filling tool 100 in an oil well to prevent the filling tool 100 from slipping.

With reference to FIG. 4, this example proposes a water control tool

in a sublevel, including a water control unit assembly 700 and a sublevel filling tool for a horizontal well; the water control unit assembly 700 is located in the horizontal well sublevel filling tool.

The water control assembly 700 is inserted into the sublevel fill tool for a horizontal well, and the water control block assembly 700 can be sealed with the bypass packer 200 and the seal hole of the anti-hydraulic seal 500 in the sublevel fill tool for the horizontal well, thus realizing a multi-level water control operation.

With reference to FIG. 4 and 6, in the optional solution of this example, the water control unit assembly 700 includes a plurality of groups of water control units, and any two adjacent groups of water control units are connected by a sealing rod; a sealing rod 710a located in the bypass packer 200 may be sealed to the bypass packer 200, and a sealing rod 710b located in the seal bore of the anti-hydraulic seal 500 may be sealed to the seal bore of the anti-hydraulic seal 500.

Moisture in the produced oil can be filtered through multiple groups of water control units, which greatly reduces the water content of the produced oil.

Each of the water control units is composed of a plurality of elements of the water control system 701, and different types of elements of the water control system 701 can be selected according to different situations in each layer.

Specifically, a plurality of groups of water control units are connected by sealing rods, and after the water control unit 700 is inserted into the horizontal well sublevel filling tool, the sealing rod 710c can be sealed with the tool.

filling 100, the packing rod 710a can be sealed with the bypass packer 200, and the packing rod 710b can be sealed with the seal hole of the anti-hydraulic seal 500.

Through the seal hole of the anti-hydraulic seal 500, the water control unit 700 can be conveniently replaced at a later stage, and the pressure difference between the top and the bottom of the seal rod 710b can be easily eliminated with the seal hole of the anti-hydraulic seal 500 so that workers can it is convenient to lift the water control unit 700.

It should be noted that the sealing rod is a hollow tube fitting, with the outer wall of the sealing rod provided with a sealing member 720. The sealing rod can be hydraulically connected to other pipeline fittings.

In particular, in the prior art, the element of the water control system 701 may be an oil production flow regulator. Since the bypass sieve 300 is located outside the oil production flow regulator, if the oil production flow regulator is damaged, a worker can easily raise the oil production flow regulator without removing the oil production flow regulator, as had to be done in the prior art.

This example presents a method for filling the sublevel and controlling water in the sublevel, including the steps of: connecting the bypass packers 200 to the bypass sieve tubes 300 to form the tool string, connecting the attached tool string to the filling tool 100, and then performing the preparatory work; filling operation; after completion of filling, placing the water control unit assembly 700; installation of the water control unit assembly 700 at the level of the upper part of the filling tool 100 and performing

the seal between the water control assembly 700 and the bypass packer 200 and the seal bore of the anti-hydraulic seal 500.

It should be noted that in the filling operation, the filling sand may be ultra-light particles, the ultra-light particles have a low apparent density and a low settling rate, which can reduce risks such as sand plugging and pipe string jamming and the like caused by a fast proppant settling rate. Due to the low apparent density of ultra-light particles, a water-based reagent or active water of 2-3 centipoise (cP) can be used to transfer sand, thus bypassing the standard liquid preparation process. At the same time, the ultralight particles are highly streamlined, which can reduce abrasion of oil pipes or ground equipment and reduce construction risks during the pumping process.

For example, the specific gravity of the ultralight particles is 1.05 g / cm ³ , and ceramic particles or gravel can be used.

In an optional solution to this example, preparatory work includes installing the filling service tool 400 and sealing the filling tool 100, unlocking to disconnect the filling service tool 400 from the filling tool 100, and lifting the filling service tool 400; after lifting the fill service tool 400, opening the seal pressure transmission port of the bypass packer 200 with the changeover tool 410 on the fill service tool 400 to seal the bypass packer 200.

After the fill service tool 400 is raised, the water control assembly 700 is positioned. The water control assembly 700 can replace the water control assembly according to design requirements. The water control mode can be a manual water control mode or a water control mode with

self-adjusting flow control. This makes it easier to change the water control adjustment mode in accordance with the technological requirements of the production.

In some cases, the operations of positioning the filling service tool 400, sealing the filling tool 100, unlocking to detach the filling service tool 400 from the filling tool 100, and lifting the filling service tool 400 are completed sequentially.

It should be noted that FIG. 7 is a schematic diagram of the structure of the sealing rod. After the sealing rod is lowered, the sealing rod forms a seal with the other pipe bodies by means of a sealing member 720 on the outer wall.

It should be noted that FIG. 8 is a schematic diagram of the structure of the seal hole of the anti-hydraulic seal 500. When the seal hole of the anti-hydraulic seal 500 is sealed to the fill maintenance tool 400 or to the sealing rod, the inside of the seal hole of the anti-hydraulic seal 500 sealed and blocked and no water flow can flow through the channel. When it is necessary to remove the 400 fill service tool or seal rod, the water pressure at the top of the seal hole of the anti-hydraulic seal is higher than the pressure at the bottom during lifting. In this case, the flow of water passes from the first pressure transfer port 510 to the pressure transfer port 540 and pushes the plug piston 530 downward so that the pressure transfer port 540 is unlocked and the first pressure port 510 can communicate with the second pressure port 520 through the pressure transmission channel 540. This eliminates the pressure difference between the top and bottom of the anti-hydraulic seal hole

valve and allows workers to easily pull the fill maintenance tool 400 or the sealing rod out of the seal hole of the anti-hydraulic seal 500.

In conclusion, it should be noted that the above example is only intended to describe the technical solutions of the present invention and not to limit the present invention. Although the present invention has been described in detail with reference to the above examples, those skilled in the art will appreciate that they may modify the technical solutions described in the above examples, or make equivalent substitutions for some or all of their specifications. ... However, these modifications or replacements will not result in the essence of the corresponding technical solutions going beyond the technical solutions of the examples of the present invention.

Claims (17)

1. A sublevel filling tool for a horizontal well, consisting of a filling tool (100), a plurality of bypass sieve pipes (300) and a bypass packer (200) connected between any two adjacent bypass sieve pipes (300), characterized in that the bypass sieve pipes (300) are hermetically connected to the bypass packer (200); and the filling tool (100) is tightly connected to the uppermost sieve bypass tube (300), and additionally contains a tool for servicing the filling (400); moreover, the filling service tool (400) is located in the filling tool (100) and is provided with a switching tool (410) for sealing the bypass packer (200), wherein said filling tool (400) is removable from filling tool (100). 2. A sub-floor filling tool for a horizontal well according to claim 1, characterized in that the bottom of the lowest bypass sieve pipe (300) is connected to the seal hole of the anti-hydraulic seal (500), and during the filling operation, the seal hole of the anti-hydraulic seal (500) can be tightly connected to the filling service tool (400). 3. A sublevel filling tool for a horizontal well according to claim 2, characterized in that the lower part of the seal hole of the anti-hydraulic seal (500) is connected to the casing shoe (600) to prevent filling sand from entering the oil well annulus into the oil pipe. 4. A sublevel filling tool for a horizontal well according to claim 1, wherein the bypass (210) of the bypass packer (200) communicates with the bypass (310) of the bypass sieve tube (300). 5. Substage filling tool for a horizontal well according to any one of claims 1 to 4, characterized in that the outer wall of the filling tool (100) is provided with an anchor part. 6. A water control tool in the sublevel, containing a water control unit assembly (700) and a sublevel filling tool for a horizontal well according to any one of claims 1-5, characterized in that the water control unit assembly (700) is located in the sublevel filling tool for a horizontal well and contains a plurality of groups of water control units, and any two adjacent groups of water control units are connected by a sealing rod; a sealing rod located in the bypass packer (200) can be hermetically connected to the bypass packer (200), and a sealing rod located in the seal hole of the anti-hydraulic seal (500) of the horizontal well sublevel filling tool can be hermetically connected to the seal hole of the anti-hydraulic shutter (500). 7. A method for filling the sublevel and controlling the water in the sublevel, including the following steps: connecting the bypass packers (200) to the bypass sieve tubes (300) to form the tool string, connecting the attached tool string to the filling tool (100) and carrying out preparatory work; filling operation; placing the water control tool on the sublevel after completion of filling; Installing the sublevel water control tool at the top of the filling tool (100) and performing a seal between the sublevel water control tool and the bypass packer (200) and the seal hole of the anti-hydraulic seal (500). 8. A method for filling the sublevel and controlling water in the sublevel according to claim 7, characterized in that the preparatory work includes installing the filling service tool (400) and sealing the filling tool (100), unlocking for disconnecting the filling service tool (400) from the filling tool (100) and lifting the filling service tool (400); after lifting the fill service tool (400), opening the seal pressure transmission channel of the bypass packer (200) with a switching tool (410) on the fill service tool (400) to seal the bypass packer (200).

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