Horizontal well casing checking tool suitable for oil field

Abstract

The utility model discloses a horizontal well casing inspection tool suitable for an oil field, which comprises a setting and pressurizing seal inspection assembly and a bypass valve, and the bypass valve and the setting and pressurizing seal inspection assembly are connected through an oil pipe. The oil pipe is divided into a vertical section oil pipe and a horizontal section oil pipe, the bypass valve is located on the vertical section oil pipe, and the setting, pressing and seal examining assembly is located on the horizontal section oil pipe. The sleeve checking device improves the sleeve checking accuracy, saves the cost and reduces the labor force; the check valve can be prevented from losing efficacy due to gravity in the horizontal well section; the bypass valve enables the oil sleeve pressure to be in a balanced state in the vertical well section, and the effect is better than that of a check valve of a horizontal well section.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of oil exploitation, and concretely relates to horizontal well casing inspection tool suitable for oil field. BACKGROUND

[0002] The commonly used technical scheme of the horizontal well casing inspection tool at present is to use the combination of centralizers, water distributors, packers and single flow valves to test the lost section of the horizontal well, but the device has the problem that the single flow valve cannot be tightly seated in the horizontal section of the horizontal well due to gravity during casing inspection. This phenomenon occurs from time to time during operation and construction, and repeated casing inspection greatly increases the waste of human and material resources. The RTTS packer casing inspection tool introduced on pages 16-18 of International Field Exploration and Development Conference can be used in the vertical well section to realize the communication of the formation, the inner cavity of the oil pipe and the annular space of the casing, effectively eliminate the pressure difference and reduce the unblocking load. However, this method cannot be applied to the horizontal well section.

[0003] Publication No. CN113090253B discloses a casing pressure testing device and method for horizontal wells, which comprises a packer, an oil pipe, an oil pipe gate and a pressure regulating guide unit. The packer comprises a center pipe and an inflatable rubber sleeve. The inflatable rubber sleeve is sleeved on the center pipe. The center pipe is provided with a liquid inlet hole. The liquid inlet hole is in communication with the inflatable rubber sleeve. The pressure regulating guide unit comprises a guide and a one-way valve. The guide is provided with an oil inlet hole. The one-way valve comprises an outer cylinder, a mounting plate, a spring, a pressure testing ball and a ball seat. The ball seat is provided with an oil inlet channel. The outer wall of the mounting plate is fixedly connected with the inner wall of the first end of the outer cylinder. The mounting plate is provided with a through hole. One end of the spring is fixed to the mounting plate. The other end of the spring is connected with the pressure testing ball. The pressure testing ball is matched with the oil inlet channel. The outer wall of the ball seat is fixedly connected with the inner wall of the second end of the outer cylinder. The second end of the outer cylinder is connected with the guide. The packer is installed on the oil pipe. The center pipe is in communication with the oil pipe. The second end of the oil pipe is in communication with the guide through the one-way valve.

[0004] The single flow valve arranged in the horizontal well section of the prior art may not be tightly seated due to gravity, which affects casing inspection and leak detection.

[0005] CN204344115U discloses an oil casing leak detection and sealing system, comprising an oil casing leak detection and sealing tool and one or more packers, the packers comprising an in-pipe packer and a casing packer, wherein the oil casing leak detection and sealing tool is arranged in an oil pipe or a casing, the in-pipe packer is arranged in the oil pipe, and the casing packer is arranged in the casing; the oil casing leak detection and sealing tool comprises a main body part and a variable part; the main body part comprises a first end and a second end, the first end is connected with the oil pipe or a coiled tubing, the in-pipe packer or the casing packer, and the second end is threadedly connected with the variable part.

[0006] The prior art has the problem that the single-flow valve in the horizontal well section cannot be tightly seated due to gravity, affecting the casing leak detection.

[0007] CN206091978U discloses an oilfield casing leak detection combined tool, which comprises, from top to bottom, an oil pipe, an extension pipe, a screen pipe, a Y221 packer and a plug.

[0008] The prior art is different from the structure of the present patent.

[0009] In summary, the technical solutions, the technical problems to be solved and the beneficial effects of the above disclosed technologies are all different from those of the present utility model. The above disclosed technology documents do not have technical inspiration for more technical features, technical problems to be solved and beneficial effects of the present utility model. Utility model content

[0010] In view of the above defects of the prior art, the utility model aims to provide a horizontal well casing detection tool suitable for oilfields.

[0011] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0012] The horizontal well casing detection tool suitable for oilfields comprises a sealing and pressing detection assembly and a bypass valve, and the bypass valve and the sealing and pressing detection assembly are connected through an oil pipe; the oil pipe is divided into a vertical section oil pipe and a horizontal section oil pipe, the bypass valve is located in the vertical section oil pipe, and the sealing and pressing detection assembly is located in the horizontal section oil pipe.

[0013] Further, the bypass valve comprises a connecting pipe body, the upper end and the lower end of the connecting pipe body are connected with the oil pipe, and a convex ring valve body is arranged on the outer wall of the connecting pipe body.

[0014] The convex ring valve body is provided with a blind hole, the side wall of the blind hole is communicated with the center channel of the connecting pipe body through a pressure transmission channel, a valve core is arranged in the blind hole, the upper end of the blind hole is connected with a valve nozzle, the valve core can be tightly sealed with the valve nozzle, and the valve core cannot seal the pressure transmission channel.

[0015] Further, the valve core is spherical.

[0016] Further, the blind hole axis is parallel to the central passage axis of the connecting pipe body, and the connecting pipe body axis is not coincident with the axis of the convex ring valve body.

[0017] Further, the lower end of the valve nozzle inner wall is a conical hole, and the upper end of the valve nozzle inner wall is a slotted hole.

[0018] Further, the bottom of the blind hole is provided with a buffer pad.

[0019] Further, the setting and pressing leak detection assembly comprises a centralizer, a water distributor and a packer, the packer is located below the centralizer and the water distributor, and the lower end of the packer is connected with a gilled plug.

[0020] Compared with the prior art, the utility model has the following beneficial effects:

[0021] 1. The accuracy of the sleeve detection is improved, the cost is saved, and the labor is reduced.

[0022] 2. The bypass valve is convenient to balance the casing pressure in the vertical well section, and the effect is better than that of the check valve in the horizontal well section.

[0023] 3. The bypass valve is convenient to carry in the operation area and is convenient to install in the operation process. DETAILED DESCRIPTION

[0024] Figure 1 is a structural schematic view of the horizontal well sleeve detection tool for oil fields of the utility model.

[0025] Figure 2 is a structural schematic view of the bypass valve in the utility model.

[0026] Figure 3 is a top view of the bypass valve in the utility model.

[0027] Figure 4 is a sleeve detection and leakage finding schematic view of A-1 well.

[0028] Figure 5 is a sleeve detection and leakage finding schematic view of A-2 well.

[0029] Figure 6 is a data graph of A-1 well and A-2 well before and after the measures.

[0030] In the drawing: 1, bypass valve; 11, connecting pipe body; 12, convex ring valve body; 13, pressure transmission passage; 14, valve nozzle; 15, valve core; 16, buffer pad;

[0031] 2, centralizer; 3, water distributor; 4, packer; 5, plug; 6, tubing; 7, casing; 8, lost section; 9, artificial bottom. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the utility model will be apparently and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by the ordinary skilled in the art without creative labor belong to the scope of protection of the utility model.

[0033] Embodiment 1

[0034] Please refer to Figure 1 The horizontal well casing inspection tool suitable for oil fields provided by the utility model comprises a bypass valve 1 and a setting and pressing casing inspection assembly connected through a tubing 6, and the bypass valve 1 is located above the setting and pressing casing inspection assembly.

[0035] Among them, the tubing 6 is divided into a vertical section tubing and a horizontal section tubing, the bypass valve 1 is installed in the vertical section tubing and is located in the vertical well section of the horizontal well after being lowered into the well, replaces the check valve in the horizontal section in the conventional technology, and solves the problem of unbalanced tubing and casing pressure; the setting and pressing casing inspection assembly is located in the horizontal section tubing.

[0036] Specifically, the setting and pressing casing inspection assembly comprises a centralizer 2, a water distributor 3 and a packer 4, the packer 4 is located below the centralizer 2 and the water distributor 3, and the lower end of the packer 4 is connected with a plug 5; the centralizer 2, the water distributor 3 and the packer 4 are all prior art and are obtained by purchase, and the structure thereof is clear to the person skilled in the art.

[0037] Specifically, the centralizer 2, the water distributor 3, the packer 4 and the plug 5 are all connected by threads.

[0038] In order to solve the phenomenon that the check valve cannot be tightly set in the horizontal well section during the casing inspection construction process, a new casing inspection scheme is used, that is, the casing inspection tool using the bypass valve 1, the centralizer 2, the water distributor 3, the packer 4 and the plug 5.

[0039] Among them, the water distributor 3 provides water power for casing inspection, the centralizer 2 can centralize the tubing 6 into the well, plays a fixing role, and the packer 4 is used for sealing the annular space of the tubing and casing.

[0040] During casing inspection, the casing inspection tool is lowered into the well, after the bypass valve 1 is lowered, the bypass valve 1 can make the fluid in the annular space of the tubing and casing enter the tubing 6, so that the pressure between the tubing 6 and the casing 7 is balanced; the tubing is positively pressed to make the packer 4 set, the water distributor 3 control valve is opened, the fluid flows out from the tubing 6 inlet and the water distributor 3, and then the lost section is verified.

[0041] The bypass valve 1 is used to replace the single flow valve in the horizontal well section in the casing inspection tool used in the vertical well section, which solves the problem of pressure imbalance between the tubing 6 and the casing 7; the combination of the bypass valve 1, the centralizer 2, the water distributor 3, the packer 4 and the nipple 5 solves the problem of inaccurate casing inspection data.

[0042] Embodiment 2

[0043] Based on Embodiment 1, in combination with Figure 2 , Figure 3 , this embodiment provides a specific structure of the bypass valve 1, which comprises a connecting pipe body 11, the upper end and the lower end of the connecting pipe body 11 are connected with the tubing 6 through threads, a convex ring valve body 12 is arranged on the outer wall of the connecting pipe body 11, a blind hole is arranged in the convex ring valve body 12, the side wall of the blind hole is communicated with the central passage of the connecting pipe body 11 through a pressure transmission channel 13, a valve core 15 is arranged in the blind hole, a valve nozzle 14 is connected with the upper end of the blind hole, the valve core 15 can be sealingly engaged with the valve nozzle 14, and the valve core 15 cannot seal the pressure transmission channel 13.

[0044] Specifically, the valve core 15 is spherical.

[0045] Specifically, the axis of the blind hole is parallel to the axis of the central passage of the connecting pipe body 11, and the axis of the connecting pipe body 11 is not coincided with the axis of the convex ring valve body 12, that is, the connecting pipe body 11 is arranged eccentrically to fully arrange the space of the blind hole.

[0046] Specifically, the valve nozzle 14 is connected with the blind hole through threads, the lower end of the inner wall of the valve nozzle 14 is a conical hole, which facilitates the sealing engagement of the valve core 14, and the upper end of the inner wall of the valve nozzle 14 is a prism hole, such as a hexagonal hole, which facilitates the tool to hold and dismount the valve nozzle 14.

[0047] Specifically, a buffer pad 16 is arranged at the bottom of the blind hole, the buffer pad 16 is a rubber pad, and the damping property of rubber is used to reduce the impact received by the valve core 15.

[0048] Embodiment 3

[0049] Based on Embodiment 2, this embodiment provides a method for casing inspection by using a bypass valve in the casing, which comprises the following steps:

[0050] Step 1: stop the normal production of the horizontal well, and lower the casing inspection tool into the horizontal well, after being lowered, the bypass valve 1 is located in the vertical well section, the nipple 5, the packer 4, the water distributor 3 and the centralizer 2 are located in the horizontal well section, and the packer 4 has been set and sealed;

[0051] Step 2: Balancing the pressure difference inside and outside tubing 6. Since casing 7 is filled with a liquid column, ideally 100m of liquid column has a pressure of 1MPa. When the well depth reaches 2000m, the hydrostatic pressure can reach 20MPa. However, the casing inspection tool is an empty tubing 6 with an internal pressure of 0. Therefore, a pressure difference will be generated inside and outside the casing annular space. When the pressure is high enough, it will also damage the casing inspection tool. As can be seen from the schematic diagram of bypass valve 1, when valve core 15 falls into the bottom of the blind hole, due to the depth of the blind hole, valve core 15 and pressure transmission channel 13 cannot be sealed. The liquid in the casing annular space will flow into the casing inspection tool through pressure transmission channel 13, thereby balancing the casing pressure. When pressurizing from tubing 6, valve core 15 completely blocks valve nozzle 14, so that the liquid during casing inspection pressurization will not flow into the casing annular space.

[0052] Step 3: First, lower the packer 4 of the test kit below the leakage section, pressurize the oil pipe 6, and find that the pressure drops to 10 MPa and then drops to zero the moment the pump stops, indicating that the leakage section is above the packer 4.

[0053] Step 4: Raise the casing inspection tool until the packer 4 of the inspection tool is raised above the lost section. Pressurize the tubing and find that the pressure reaches 10 MPa. After stopping the pump for 15 minutes, the pressure does not drop, thus proving that the lost section has been found above.

[0054] Step 5: Repeat steps 3 and 4 to obtain the accurate location of the missing segment.

[0055] By using a bypass valve 1 in the vertical well section instead of the original check valve in the horizontal well section, the phenomenon of the check valve not sealing properly due to gravity is avoided, and the location of the casing leakage can be determined.

[0056] Example 4:

[0057] Based on Example 3, such as Figure 4 As shown, during on-site construction, taking A-1 as an example, the leak was successfully located at 2647-2655m using the bypass inspection method. The leak was then plugged, achieving good results after the operation. Figure 6 As shown.

[0058] like Figure 5 As shown, the casing inspection tool can also be used in vertical wells. In this case, the horizontal section of tubing 6 is also in a vertical position. Taking A-2 as an example during field construction, by using the bypass casing inspection method and verifying that the casing was problem-free using the improved method, the casing was sealed below Sha 2-83 and converted to single-production above Sha 2-83. This operation yielded good results. Figure 6 As shown.

[0059] from Figure 6As can be seen, the comprehensive water cut of the two wells before the operation is 99.4%, and the comprehensive water cut after the operation is reduced by 4.4%. From the oil increase amount analysis, compared with before the operation, the oil increase is 5.9 tons / day.

[0060] In the present application, the parts not discussed in detail, the connection mode of each part in the present application, are all known in the art. Direct application can be used, and will not be repeated.

[0061] In the present application, the term "a plurality of" refers to two or more, unless otherwise specified. The terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, "connecting" can be fixed connection, or detachable connection, or integrated connection; "connected" can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0062] In the description of the present application, it should be understood that the terms "upper", "lower", "left", "right", "front", "back" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or units referred to must have a particular direction, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the present application.

[0063] In the description of the present application, the terms "one embodiment", "some embodiments", "specific embodiments" and the like mean that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0064] The above is only the preferred embodiment of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A horizontal well casing inspection tool suitable for use in oil fields, comprising a setting and pressing seal inspection assembly, characterized in that, The bypass valve and the setting, pressing and sealing assembly are connected by the oil pipe; The oil pipe is divided into a vertical section oil pipe and a horizontal section oil pipe, the bypass valve is located in the vertical section oil pipe, and the setting, pressing and sealing assembly is located in the horizontal section oil pipe.

2. The horizontal well casing inspection tool suitable for use in oil fields according to claim 1, characterized in that, The bypass valve comprises a connecting pipe body, the upper end and the lower end of the connecting pipe body are connected with the oil pipe, and the outer wall of the connecting pipe body is provided with a convex ring valve body; The convex ring valve body is provided with a blind hole, the side wall of the blind hole is communicated with the center channel of the connecting pipe body through a pressure transmission channel, a valve core is arranged in the blind hole, the upper end of the blind hole is connected with a valve nozzle, the valve core can be sealingly connected with the valve nozzle, and the valve core cannot seal the pressure transmission channel.

3. The horizontal well casing inspection tool suitable for use in oil fields according to claim 2, characterized in that, The valve core is spherical.

4. The horizontal well casing inspection tool suitable for use in oil fields according to claim 2, characterized in that, The axis of the blind hole is parallel to the axis of the center channel of the connecting pipe body, and the axis of the connecting pipe body is not coincided with the axis of the convex ring valve body.

5. The horizontal well casing inspection tool suitable for use in oil fields according to claim 2, characterized in that, The lower end of the inner wall of the valve nozzle is a conical hole, and the upper end of the inner wall of the valve nozzle is a prismatic hole.

6. The horizontal well casing inspection tool suitable for use in oil fields of claim 2, wherein, The bottom of the blind hole is provided with a buffer pad.

7. The horizontal well casing inspection tool suitable for use in oil fields of claim 1, wherein, The setting, pressing and sealing assembly comprises a centralizer, a water distributor and a packer, the packer is located below the centralizer and the water distributor, and the lower end of the packer is connected with a plug.

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