Cable pumping depth correction device and method in multi-size compound pipe column

Abstract

The invention belongs to the technical field of logging depth correction, and discloses a cable pumping depth correction device and method in a multi-size compound string, which can ensure the depth correction precision of large-displacement TCP (Transmission Control Protocol) perforation. The device comprises at least two graded pumping devices which are connected to a cable on the upper portion of a halter in series and can slide relative to the cable, the lower portion of the halter is connected with a depth correction instrument, the maximum outer diameter size of each graded pumping device in the well depth direction is gradually reduced, and each graded pumping device comprises a pump plug and a centralizing connector. The centralizing connector of one of the adjacent graded pumping devices abuts against the pump plug of the other graded pumping device, and the centralizing connector of the graded pumping device with the large outer diameter size is hung at the position when reaching the variable buckle reducing position of a pipe column. The graded pumping device with the smaller outer diameter is separated from the graded pumping device with the larger outer diameter under external pressure and continues to move downwards to push the adjacent graded pumping device with the smaller outer diameter, the halter and the depth correction instrument to move downwards until the depth correction instrument is pumped to a perforation layer.

Description

Technical Field

[0001] The invention relates to the technical field of well logging depth calibration, and in particular to a device and method for depth calibration using cable pumping in a multi-size composite pipe string. Background Art

[0002] At present, extended-reach wells are increasingly being used in offshore oil and gas field development. The deepest offshore extended-reach well has reached nearly 10,000 meters. The wellbore structure generally adopts a three-hole design with a 5.5-inch or 7-inch tail pipe. This type of well is characterized by deep depth, large well inclination, and long horizontal displacement. When the cable is calibrated, it is often impossible to lower it into place by free lowering.

[0003] TCP perforation, the full name of which is Tubing-Con conveyed Perforation, is an advanced completion technology. It connects the perforating gun and the detonator to the tubing string, uses the tubing to transport them to the target layer downhole, and then performs the perforation operation. Depending on the size of the casing, the TCP perforating string usually requires two or three sizes of drill pipe to compound and transport the perforating gun. After the TCP perforating string is in place, the string needs to be calibrated. The success or failure of the depth calibration has a great impact on the perforation operation.

[0004] At present, there are two main depth calibration methods used in TCP perforating of extended reach wells, namely: (Logging While Drilling) connecting the perforating string for depth calibration and fixed pump plug cable pumping depth calibration. LWD is a technology that obtains geological and engineering data in real time during the drilling process. LWD connecting the perforating string usually refers to integrating LWD technology into the perforating string so as to obtain real-time downhole data while perforating. However, both of these depth calibration methods have certain limitations. The main disadvantages of using LWD for depth calibration are: (1) Small-size LWD instrument resources are in the hands of foreign companies, and domestic resources are in short supply. They need to be mobilized and coordinated in advance, and the mobilization and operation costs are very high; (2) The distance between the LWD instrument and the perforating gun is relatively close, and the shock wave after the perforating gun is detonated will work on the LWD instrument, which may cause damage to the instrument; (3) In order to protect the LWD instrument, the depth calibration accuracy cannot be guaranteed when the connection distance to the perforating gun is far. The main disadvantages of using fixed pump plugs for pumping depth calibration are: the fixed pump plug has a fixed size. Although it works well when used in a single-size drill pipe, TCP perforating in extended-reach wells usually uses a combination of two or three sizes of drill tools. The pump plug size can often only be selected according to the smallest-size drill pipe. This often results in poor pumping effect in the large-size drill pipe above, and it cannot be lowered into place, and the accuracy of perforation depth calibration cannot be guaranteed. Summary of the invention

[0005] In order to ensure the depth calibration accuracy of large-displacement TCP perforation and enable the cable depth calibration instrument to be accurately lowered to the perforation layer, the present invention proposes a cable pumping depth calibration device and method in a multi-size composite pipe string.

[0006] The multi-size composite pipe string inner cable pumping depth calibration device according to the present invention comprises: at least two graded pumping devices, each graded pumping device is sequentially connected in series on the cable at the upper part of the faucet and can slide relative to the cable, the lower part of the faucet is connected to the depth calibration instrument, and the maximum outer diameter of each graded pumping device gradually decreases in the direction toward the well depth, and each graded pumping device at least comprises a pump plug and a straightening joint sequentially connected from top to bottom, the pump plug is used to drive the graded pumping device downward under the action of external pressure, and the straightening joint of one of the adjacent graded pumping devices is connected to the well depth. The head is in contact with the pump plug of the other one, so that during the pumping and lowering process, when the graded pumping device with a larger outer diameter in the adjacent graded pumping devices reaches the variable-decline position of the pipe string, the straightening joint of the graded pumping device sits on the variable-decline position, and the graded pumping device with a smaller outer diameter adjacent to the graded pumping device is separated from the graded pumping device under external pressure and continues to descend, while pushing the graded pumping device with an even smaller outer diameter adjacent to it, the faucet and the depth calibration instrument downward until the depth calibration instrument is pumped to the preset perforation layer.

[0007] Furthermore, the graded pumping device also includes an extension tube connected between the pump plug and the straightening joint, and a cable flow tube for passing the cable is sleeved in the extension tube.

[0008] Further, the hardness of the cable flow tube is smaller than the hardness of the cable.

[0009] Furthermore, the cable flow tube is made of copper metal.

[0010] Furthermore, when the straightening joint is hung at the variable-buckle and reduced-diameter position, a fluid conduction channel is formed between the straightening joint and the variable-buckle and reduced-diameter position of the pipe string, and a gap for fluid passage is formed between the pump plug and the inner wall of the pipe string, and the gap is connected to the conduction channel.

[0011] Furthermore, the pump plug includes a pump plug cylinder connected to the extension tube and a plurality of leather cups sleeved on the outer circumference of the pump plug cylinder.

[0012] Furthermore, the leather cup is made of perfluororubber.

[0013] Furthermore, the graded pumping device also includes a salvage cap arranged on the pump plug.

[0014] The method for cable pumping depth calibration in a multi-size composite pipe string according to the present invention comprises the following steps: sequentially passing the cable on the upper part of the malachite through a plurality of graded pumping devices with increasing maximum outer diameters to connect the graded pumping devices in series on the cable, and installing a depth calibration instrument on the lower part of the malachite; allowing fluid to flow in through the annulus between the graded pumping device and the pipe string, the fluid pushes the graded pumping device with the largest outer diameter downward to drive other graded pumping devices, the malachite and the depth calibration instrument downward, and when the graded pumping device reaches the variable-decline position of the pipe string, the graded pumping device is suspended at the variable-decline position, and the graded pumping device with a smaller outer diameter adjacent to the graded pumping device is separated from the graded pumping device under the pressure of the fluid and continues to descend, while pushing the graded pumping device with a smaller outer diameter adjacent to it, the malachite and the depth calibration instrument downward, until the depth calibration instrument is pumped to a preset perforation layer.

[0015] Furthermore, the method for depth calibration of cable pumping in a multi-size composite pipe string also includes: respectively configuring a salvage cap on each staged pumping device, so that the staged pumping device can be salvaged out of the well by using a salvage tool in cooperation with the salvage cap when necessary.

[0016] Compared with the prior art, the cable pumping depth calibration device and method in the multi-size composite pipe column of the present invention can realize continuous pumping in the multi-size composite pipe column or drill pipe by using the serial graded pumping device, filling the gap in the field of cable depth calibration of TCP perforation in large displacement wells, so that the cable depth calibration instrument can be accurately lowered to the perforation layer, thereby ensuring the accuracy of large displacement TCP perforation depth calibration. The cable pumping depth calibration device and method in the multi-size composite pipe column of the present invention can provide power through wellhead pressurization, and realize the automatic separation of adjacent two-stage graded pumping devices through the coordination of the righting joint and the variable buckle reduction position of the pipe column or drill pipe, thereby achieving the purpose of graded pumping. It relies on pure mechanical principles, and the realization principle is simple, the failure rate is low, and the reliability is strong. In addition, the cable flow tube, pump plug and other structures used are easy to replace, and can be applied to composite drill pipes of various sizes and cables of different thicknesses. In addition, each graded pumping device can adopt a modular design, which is simple and more compact in structure, easy to install and disassemble, and the whole set of devices is easy to install and disassemble, simple to operate, and suitable for continuous pumping in drill pipes of various composite sizes. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of a cable pumping depth calibration device in a multi-size composite pipe string according to an embodiment of the present invention;

[0018] Figure 2 for Figure 1 A cross-sectional view of a cable pumping depth calibration device in a multi-size composite pipe string is shown. DETAILED DESCRIPTION

[0019] In order to better understand the purpose, structure and function of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings.

[0020] Figure 1 and Figure 2 The structure of a cable pumping depth calibration device 100 in a multi-size composite pipe string according to an embodiment of the present invention is shown. Figure 1 and Figure 2 As shown, the multi-size composite pipe string inner cable pumping depth calibration device 100 may include: at least two graded pumping devices, each graded pumping device is sequentially connected in series on the cable 7 on the upper part of the faucet 6 and can slide relative to the cable 7, the lower part of the faucet 6 is connected to the depth calibration instrument, and the maximum outer diameter of each graded pumping device gradually decreases in the direction toward the well depth, and each graded pumping device includes at least a pump plug 2 and a straightening joint 1 sequentially connected from top to bottom, the pump plug 2 is used to drive the graded pumping device downward under the action of external pressure, and the straightening joint of one of the adjacent graded pumping devices is connected to the lower part of the faucet 6. The positive joint 1 is in contact with the pump plug 2 of the other one, so that during the pumping and lowering process, when the graded pumping device with a larger outer diameter among the adjacent graded pumping devices reaches the variable-decline position of the pipe string, the straightening joint 1 of the graded pumping device sits on the variable-decline position, and the graded pumping device with a smaller outer diameter adjacent to the graded pumping device is separated from the graded pumping device under external pressure and continues to descend, while pushing the graded pumping device with an even smaller outer diameter adjacent to it, the malachite 6 and the depth calibration instrument downward until the depth calibration instrument is pumped to the preset perforation layer.

[0021] The cable pumping depth calibration device 100 in the multi-size composite pipe string of the embodiment of the present invention relies on a complete set of serial graded pumping devices, and each graded pumping device can be selected according to the specific size of the pipe string or drill pipe, and distributed in series on the cable 7. When the pump is turned on at the wellhead, the pump plug 2 of the largest-size graded pumping device pushes the pump plug 2, the malachite 6 and the depth calibration instrument of the following small-size graded pumping device downward under the action of external pressure. When the tool string reaches the buckle where the two pipe strings or drill pipes are connected, the straightening joint 1 of the largest-size graded pumping device will be located at the buckle reduction position, and the small-size graded pumping device below will start to work, pushing the smaller-size graded pumping device, the malachite 6 and the instrument below to continue to move downward until the depth calibration instrument is pumped to the perforation layer, thereby achieving accurate depth calibration. In theory, the graded pumping device can be infinitely added according to the composite size of the pipe string, so that the depth calibration instrument can be pumped into place in the multi-size composite pipe string drill pipe.

[0022] The cable pumping depth calibration device 100 in the multi-size composite pipe string of the embodiment of the present invention can realize continuous pumping in the multi-size composite drill pipe by using the serial graded pumping device, filling the blank in the field of cable depth calibration of TCP perforation in large displacement wells, so that the cable depth calibration instrument can be accurately lowered to the perforation layer, thereby ensuring the accuracy of large displacement TCP perforation depth calibration. The cable pumping depth calibration device 100 in the multi-size composite pipe string of the embodiment of the present invention can provide power through wellhead pressurization, and realize the automatic separation of adjacent two-stage graded pumping devices through the coordination of the straightening joint 1 and the variable buckle and reduced diameter position of the pipe string or drill pipe, thereby achieving the purpose of graded pumping. It relies on pure mechanical principles, has a simple implementation principle, a low failure rate, and strong reliability. In addition, each graded pumping device can adopt a modular design, and its structure is simple and more compact. The whole set of devices is easy to install and disassemble, simple to operate, and suitable for continuous pumping in drill pipes of various composite sizes.

[0023] exist Figure 1 and Figure 2 In the illustrated embodiment, two staged pumping devices are included, namely a first-stage pumping device 10 and a second-stage pumping device 20. The first-stage pumping device 10 and the second-stage pumping device 20 are sequentially connected in series on the cable 7 on the upper part of the faucet 6 and can slide relative to the cable 7. The lower part of the faucet 6 is connected to a depth calibration instrument (not shown in the figure). In the direction toward the well depth, the maximum outer diameter of the second-stage pumping device 20 is greater than the maximum outer diameter of the first-stage pumping device 10. The straightening joint 1 of the second-stage pumping device 20 abuts against the pump plug 2 of the first-stage pumping device 10, so that during the pumping and lowering process, when the second-stage pumping device 20 with a larger outer diameter reaches the variable-decline position of the pipe string, the straightening joint 1 of the second-stage pumping device 20 sits on the variable-decline position, and the first-stage pumping device 10 with a smaller outer diameter separates from the second-stage pumping device 20 under external pressure and continues to descend, while pushing the faucet 6 and the depth calibration instrument downward until the depth calibration instrument is pumped to a preset perforation layer.

[0024] In such Figure 1 and Figure 2 In the preferred embodiment shown, the step-by-step pumping device may further include an extension tube 3 connected between the pump plug 2 and the righting joint 1, and a cable flow tube 4 for passing the cable 7 is sleeved inside the extension tube 3. The extension tube 3 is used to increase the distance between the pump plug 2 and the righting joint 1 to increase the flow rate of the fluid in the area between the pump plug 2 and the righting joint 1, and is used to protect the cable flow tube 4 inside it, and the cable flow tube 4 is used to support and guide the cable 7 passing through it, and the cable flow tube 4 can be adapted according to different cable models.

[0025] In a preferred embodiment, the hardness of the cable flow tube 4 may be less than the hardness of the cable 7. In this way, when the cable 7 with greater hardness slides in the cable flow tube 4 with less hardness, even if the cable 7 and the cable flow tube 4 rub against each other, the wear of the cable 7 is very low, and more wear is caused to the cable flow tube 4. Therefore, this configuration can protect the cable 7, and the cable flow tube 4 can be replaced after serious wear.

[0026] Preferably, since the cable 7 is made of steel, the material of the cable flow tube 4 can be selected to be copper metal.

[0027] According to the present invention, when the straightening joint 1 is hung at the buckle-reduced position, a fluid conduction channel is formed between the buckle-reduced position of the pipe string, and a gap for fluid passage is formed between the pump plug 2 and the inner wall of the pipe string, and the gap is connected to the conduction channel. This setting is used to realize the circulation of fluid in the annulus between each graded pumping device and the pipe string after the straightening joint 1 is hung, so as to ensure that the fluid can pump each graded pumping device.

[0028] In such Figure 2 In the preferred embodiment shown, the pump plug 2 may include a pump plug column 21 connected to the extension tube 3 and a plurality of leather cups 22 sleeved on the outer circumference of the pump plug column 21. Preferably, the leather cups may be made of perfluororubber. The arrangement of the leather cup 22 structure allows the pump plug 2 to fit closely with the inner wall of the pipe string, increasing the effective area of ​​the fluid acting on the pump plug, helping to reduce the pumping pressure of the fluid, achieving low-displacement and low-pressure pumping, and reducing fatigue effects on the perforating gun ignition head pin. On the basis of the leather cup 22 fitting closely with the inner wall of the pipe string, the leather cup 22 can still pass the fluid after being deformed under the fluid pressure, thereby not affecting the pumping of the fluid to the next-level graded pumping device.

[0029] Preferably, the outer diameters of the plurality of leather cups 22 may increase sequentially in the direction toward the well depth. This arrangement enables each leather cup 22 to withstand fluid pressure, which is conducive to using a smaller fluid pumping pressure to achieve the pumping purpose of the graded pumping device.

[0030] Also preferably, the pump plug 2 can also be made of nylon material, which can be replaced after being worn and has strong flexibility.

[0031] According to the present invention, the staged pumping device may further include a salvage cap 5 disposed on the pump plug 2, which is used to salvage the staged pumping device in complex situations. Figure 2 As shown, the salvage cap 5 can abut against the straightening joint 1 of the upper stage stage pumping device. Preferably, a seat hole 11 can be formed on the straightening joint, and the salvage cap 5 can abut against the seat hole 11. This arrangement can improve the stability of the abutment between two adjacent stage pumping devices.

[0032] The method for calibrating depth by cable pumping in a multi-size composite pipe string according to an embodiment of the present invention may include the following steps: Figure 1 As shown, the cable 7 on the upper part of the Maltcock 6 can first be passed through a plurality of graded pumping devices with increasing maximum outer diameters in sequence, so as to connect the graded pumping devices in series on the cable 7, and install the depth calibration instrument at the lower part of the Maltcock 6; then the fluid is allowed to flow in through the annulus between the graded pumping device and the tubing, and the fluid pushes the graded pumping device with the largest outer diameter downward to drive other graded pumping devices, the Maltcock 6 and the depth calibration instrument downward; when the graded pumping device reaches the variable-decline position of the tubing, the graded pumping device is suspended at the variable-decline position, and the graded pumping device with a smaller outer diameter adjacent to the graded pumping device is separated from the graded pumping device under the pressure of the fluid and continues to descend, while pushing the graded pumping device with a smaller outer diameter adjacent to it, the Maltcock 6 and the depth calibration instrument downward, until the depth calibration instrument is pumped to the preset perforation layer.

[0033] When calibrating the depth of TCP perforation in extended-reach wells, a composite drilling tool is used to transport the perforation device. Through the cable pumping depth calibration method in a multi-size composite tubing string according to the embodiment of the present invention, a series-type graded pumping device is used to achieve continuous pumping in a multi-size composite tubing string, and pump the depth calibration instrument to the perforation layer. The cable pumping depth calibration method in a multi-size composite tubing string according to the embodiment of the present invention fills the gap in the field of cable depth calibration for TCP perforation in extended-reach wells, so that the cable depth calibration instrument can be accurately lowered to the perforation layer, thereby ensuring the accuracy of the extended-reach TCP perforation depth calibration. During the entire pumping process, the wellhead is turned on to provide downward power to each graded pumping device, and the series-type graded pumping device cooperates with the drill pipe buckle step to separate each pumping device, thereby achieving the purpose of graded pumping. This method is simple and reliable, based on pure mechanical principles, has a low failure rate, and has wide promotion and use value.

[0034] Preferably, the method for depth calibration of cable pumping in a multi-size composite pipe string may further include: respectively configuring a fishing cap 5 on each staged pumping device, so that the staged pumping device can be fished out of the well by using a fishing tool in cooperation with the fishing cap 5 when necessary.

[0035] It should be noted that the cable pumping depth calibration device and method in a multi-size composite tubing string of an embodiment of the present invention can also be applied to wellbore structures with two casing sizes, and the wellbore needs to be subjected to cluster perforation operations in a horizontal section or a large well deviation section. The perforating gun can be pumped by staged pumping in a large-size casing.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A cable pumping depth calibration device in a multi-size composite pipe string, characterized in that: include: At least two graded pumping devices, each of which is serially connected to the cable at the top of the faucet and can slide relative to the cable, the lower part of the faucet is connected to the depth calibration instrument, and the maximum outer diameter of each graded pumping device gradually decreases in the direction toward the well depth, and each of the graded pumping devices at least includes a pump plug and a straightening joint connected in sequence from top to bottom, the pump plug is used to drive the graded pumping device downward under the action of external pressure, and the straightening joint of one of the adjacent graded pumping devices abuts against the pump plug of the other one, so that During the pumping and lowering process, when the graded pumping device with a larger outer diameter among the adjacent graded pumping devices reaches the variable-decline position of the pipe string, the straightening joint of the graded pumping device sits on the variable-decline position, and the graded pumping device with a smaller outer diameter adjacent to the graded pumping device is separated from the graded pumping device under external pressure and continues to descend, while pushing the graded pumping device with an even smaller outer diameter adjacent to it, the faucet and the depth calibration instrument downward until the depth calibration instrument is pumped to the preset perforation layer.

2. The cable pumping depth calibration device in a multi-size composite pipe string according to claim 1 is characterized in that: The staged pumping device further comprises an extension tube connected between the pump plug and the straightening joint, wherein a cable flow tube for passing the cable is sleeved in the extension tube.

3. The cable pumping depth calibration device in a multi-size composite pipe string according to claim 2 is characterized in that: The hardness of the cable flow tube is smaller than the hardness of the cable.

4. The cable pumping depth calibration device in a multi-size composite pipe string according to claim 3 is characterized in that: The cable flow tube is made of copper metal.

5. The cable pumping depth calibration device in a multi-size composite pipe string according to any one of claims 2 to 4, characterized in that: When the straightening joint is hung on the variable-decline position, a fluid conducting channel is formed between the straightening joint and the variable-decline position of the pipe column, and a gap for fluid passage is formed between the pump plug and the inner wall of the pipe column, and the gap is connected to the conducting channel.

6. The cable pumping depth calibration device in a multi-size composite pipe string according to claim 5 is characterized in that: The pump plug comprises a pump plug column connected to the extension tube and a plurality of leather cups sleeved on the outer circumference of the pump plug column.

7. The cable pumping depth calibration device in a multi-size composite pipe string according to claim 6 is characterized in that: The leather cup is made of perfluororubber.

8. The cable pumping depth calibration device in a multi-size composite pipe string according to any one of claims 1 to 4, characterized in that: The staged pumping device also includes a salvage cap disposed on the pump plug.

9. A method for calibrating the depth of a cable pump in a multi-size composite pipe string, characterized in that: The following steps are involved: Pass the cable on the upper part of the Malt Spout through a plurality of graded pumping devices with increasing maximum outer diameters in sequence, so as to connect the graded pumping devices in series on the cable, and install the depth calibration instrument at the lower part of the Malt Spout; The fluid is made to flow into the annulus between the graded pumping device and the tubing, and the fluid pushes the graded pumping device with the largest outer diameter downward to drive other graded pumping devices, the faucet and the depth calibration instrument downward; when the graded pumping device reaches the variable-decline position of the tubing, the graded pumping device is made to sit on the variable-decline position, and the graded pumping device with a smaller outer diameter adjacent to the graded pumping device is separated from the graded pumping device under the pressure of the fluid and continues to descend, while pushing the graded pumping device, the faucet and the depth calibration instrument with a smaller outer diameter adjacent to it downward, until the depth calibration instrument is pumped to the preset perforation layer.

10. The method for depth calibration by cable pumping in a multi-size composite pipe string according to claim 9, characterized in that: Also includes: A salvage cap is respectively arranged on each of the graded pumping devices, so that the graded pumping devices can be salvaged out of the well by using a salvage tool in cooperation with the salvage cap when necessary.

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