Coiled tubing conveying clustering perforation tubular column

Abstract

The utility model belongs to the field of petroleum and natural gas exploration and development, and particularly relates to a coiled tubing conveying clustering perforation tubular column which comprises two sets of perforation explosion propagation units, the two sets of perforation explosion propagation units are connected through a double-male blind plug connector, and the two sets of perforation explosion propagation units are arranged in a mirror symmetry mode with the double-male blind plug connector as the symmetry center. In the two sets of perforation explosion propagation units, the perforation explosion propagation unit located above the double-male blind plug connector is communicated with a continuous oil pipe and a sleeve annulus, the perforation explosion propagation unit located below the double-male blind plug connector is only communicated with the continuous oil pipe, and the continuous oil pipe is not communicated with the sleeve annulus. The continuous oil pipe cluster perforation device can safely and efficiently complete horizontal well cluster perforation, reduces the number of times of lifting and descending the continuous oil pipe, greatly saves the total time of continuous oil pipe conveying perforation construction, can prolong the service life of the continuous oil pipe, saves the use cost of the continuous oil pipe, is high in one-time success rate of perforation operation, is simple in field assembly, and meanwhile, improves the production efficiency. And a ground operator can accurately judge the underground perforation condition, so that accurate perforation is realized.

Description

Technical Field

[0001] This utility model relates to the field of oil and gas exploration and development technology, specifically to a continuous tubing transport cluster perforation string. Background Technology

[0002] Currently, most unconventional oil and gas horizontal wells in China use the horizontal well cable bridge-perforation combined operation technology. However, this technology has its own adaptability issues: First, during the first stage of cluster perforation operation in a horizontal well, the pumping cable cannot be installed due to the lack of a circulation channel, requiring other transmission technologies to replace it. Second, if the casing is deformed or blocked by sand due to reasons such as sand fracturing in the early stage or poor fluid absorption capacity of the formation itself, it will make the operation of the pumping cable bridge-perforation tool string difficult, easily leading to the tool string encountering obstacles and getting stuck, resulting in difficult construction and high operational risks.

[0003] For the reasons mentioned above, coiled tubing-fed cluster perforation technology has been increasingly widely used. Currently, there are two types of conventional coiled tubing-fed cluster perforation strings. One type has a pressure initiation device installed at the lower end of the string, which initiates detonation by pressurizing the annulus. The other type has a pressure opening detonator connected to the upper end of the string, which initiates detonation by pressurizing the tubing. At the same time, the circulation channel between the coiled tubing and the casing is opened. Both types of strings are connected to a time-delay detonator in the middle to realize a multi-stage detonation perforation gun.

[0004] However, conventional coiled tubing delivery of clustered perforation strings has the following problems: First, poor reliability. Because multiple delay detonators are used to achieve multi-stage detonation, the quality stability of the delay detonators is greatly affected by downhole temperature and vibration, resulting in unstable delay time and poor reliability. Sometimes, delay detonators may fail to detonate or detonate prematurely, seriously affecting the success rate of perforation on the first attempt. Second, in deep wells, if a large number of delay detonators are installed continuously on the perforation string, and surface instruments have difficulty detecting perforation vibration, it will be difficult for surface operators to determine whether the current perforating gun has detonated, and thus they will not know when to start installing the perforation string for the next cluster of perforations, leading to accidental perforation accidents. Utility Model Content

[0005] The present invention aims to provide a continuous tubing delivery cluster perforation string that can safely and efficiently complete cluster perforation in horizontal wells, reduce the number of times the continuous tubing is tripped and run, avoid the occurrence of interruption or premature bursting, and enable surface operators to accurately judge the downhole perforation situation and achieve precise perforation.

[0006] Therefore, the technical solution adopted by this utility model is as follows:

[0007] A continuous tubing delivery cluster perforation string includes two sets of perforation detonation units, which are connected by a double male blind plug joint, and the two sets of perforation detonation units are arranged in a mirror symmetrical manner with the double male blind plug joint as the symmetry.

[0008] In the two sets of perforation detonation units, the perforation detonation unit located above the double male blind plug joint is connected to the coiled tubing and the casing annulus, while the perforation detonation unit located below the double male blind plug joint is only connected to the coiled tubing, and the coiled tubing is not connected to the casing annulus.

[0009] In practical use, the lifting device adjusts the explosion position according to the detonation sequence of the perforation transmission unit to achieve cluster perforation.

[0010] Based on the above technical solution, its operating principle and the resulting technical effects are as follows:

[0011] Connect all perforating equipment sequentially from top to bottom at the wellhead, ensuring a secure and accurate connection. Then, run the tubing string into the target formation as required, aligning the first cluster of perforating guns with the first cluster of perforations. Next, pressurize the annulus between the coiled tubing and casing, igniting the tail pressure initiator. The tail pressure initiator then detonates the first cluster of perforating guns. Afterward, the first cluster of perforating guns fires a time-delay detonator. During the delay period, raise the perforating string, aligning the second cluster of perforating guns with the second cluster of perforations. Wait here until the second cluster of perforating guns is determined... After the cluster perforation guns have detonated, continue to raise the perforation string so that the third cluster perforation guns are aligned with the third cluster perforation section. At this time, pressurize the coiled tubing to fire the pressure opening detonator. The pressure opening detonator detonates the third cluster perforation guns, which in turn detonate the delay detonator. During the delay period, raise the perforation string so that the fourth cluster perforation guns are aligned with the fourth cluster perforation section. Wait here. When it is determined from the ground that the fourth cluster perforation guns have detonated, the cluster perforation is complete, and the coiled tubing can be raised to the wellhead.

[0012] In a preferred embodiment, the present invention can be further configured as follows: the perforation detonation unit located above the double male blind plug joint includes a fourth cluster of perforating guns connected to the top of the double male blind plug joint, a time-delay detonator connected above the fourth cluster of perforating guns via a male-female connector, a double male connector installed on the top of the time-delay detonator, and a third cluster of perforating guns connected via the double male connector, a pressure opening detonator installed at the top of the third cluster of perforating guns via a male-female connector, and the top of the pressure opening detonator connected to the continuous tubing via a conversion connector.

[0013] In a preferred embodiment, the present invention can be further configured as follows: the perforation transmission unit located below the double male blind plug joint includes a second cluster of perforating guns connected to the bottom of the double male blind plug joint, the bottom end of the second cluster of perforating guns is connected to a time-delay transmission device via a male-female connector, the bottom end of the time-delay transmission device is connected to a first cluster of perforating guns via a double male connector, and the bottom end of the first cluster of perforating guns is connected to a gun tail pressure initiator via a male-female connector.

[0014] In a preferred embodiment, this invention can be further configured such that: the tail pressure detonator is connected to the continuous tubing and the annulus of the casing, and the pressure opening detonator is only connected to the continuous tubing, while the continuous tubing is not connected to the annulus.

[0015] The explanations of the nouns, conjunctions, or adjectives used in the above technical solutions are as follows:

[0016] A fixed connection refers to a connection in which parts or components are fixed in place, with no relative movement between them. These connections are divided into two types: detachable and non-detachable.

[0017] (1) Detachable connections use screws, splines, wedges, etc. to fix parts together. This type of connection can be disassembled during maintenance without damaging the parts. However, the specifications of the connecting parts used must be correct (such as the length of bolts, keys, wedges) and properly tightened.

[0018] (2) Non-removable connections mainly refer to welding, riveting, and tenon joints. Since disassembly requires forging, sawing, or oxy-acetylene cutting for repair or replacement, these parts generally cannot be reused. Furthermore, attention should be paid to process quality, technical inspection, and remedial measures (such as correction and polishing) during connection.

[0019] A movable connection refers to a connection in which parts or components are fixed but have relative motion.

[0020] The above-mentioned technical solution of this utility model has the following beneficial technical effects:

[0021] This invention can safely and efficiently complete cluster perforation in horizontal wells, reduce the number of times coiled tubing is run in and out, significantly save the total time of coiled tubing perforation construction, extend the service life of coiled tubing, save the cost of using coiled tubing, achieve a high success rate of perforation operation on the first attempt, and simplify on-site assembly. At the same time, ground operators can accurately judge the downhole perforation situation and achieve precise perforation. Attached Figure Description

[0022] Figure 1 This is a cross-sectional schematic diagram of the overall structure of this utility model.

[0023] Figure label:

[0024] 1. Coiled tubing; 2. Adaptor; 3. Pressure-operated detonator; 4. Male / female connector; 5. Third cluster perforation gun; 6. Double male connector; 7. Delayed detonator; 8. Fourth cluster perforation gun; 9. Double male blind plug connector; 10. Second cluster perforation gun; 11. First cluster perforation gun; 12. Pressure detonator at the end of the gun. Detailed Implementation

[0025] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure. It should be noted that, unless otherwise specified, the embodiments of this utility model and the features in the embodiments can be combined with each other.

[0026] Based on the concept of this application, combined with Figure 1 This invention describes an embodiment of a coiled tubing 1 used for cluster perforation operations to transport a cluster perforation string. Specifically, the coiled tubing 1 used for cluster perforation operations is constructed as an integral structure, including components such as a perforation detonation unit and a double male blind plug joint 9. This invention can safely and efficiently complete cluster perforation in horizontal wells, reducing the number of times the coiled tubing 1 needs to be tripped up and down, significantly saving the total time for perforation operations using the coiled tubing 1, extending the service life of the coiled tubing 1, saving on the operating costs of the coiled tubing 1, achieving a high success rate for perforation operations on the first attempt, and simplifying on-site assembly. Furthermore, surface operators can accurately assess the downhole perforation situation, achieving precise perforation.

[0027] Combination Figure 1 As shown, the present invention provides a continuous tubing 1 for conveying clustered perforation tubing string, including two sets of perforation and detonation transmission units. The two sets of perforation and detonation transmission units are connected by a double male blind plug joint 9, and the two sets of perforation and detonation transmission units are arranged in a mirror symmetrical manner with respect to the double male blind plug joint 9.

[0028] In the two sets of perforation detonation units, the perforation detonation unit located above the double male blind plug joint 9 is connected to the coiled tubing 1 and the casing annulus, while the perforation detonation unit located below the double male blind plug joint 9 is only connected to the coiled tubing 1, and the coiled tubing 1 is not connected to the casing annulus.

[0029] In practical use, the lifting device adjusts the explosion position according to the detonation sequence of the perforation transmission unit to achieve cluster perforation.

[0030] Regarding the technical solution of this embodiment, the perforation transmission unit located above the double male blind plug joint 9 includes a fourth cluster of perforating guns 8 connected to the top of the double male blind plug joint 9. A time-delay transmission device 7 is connected above the fourth cluster of perforating guns 8 via a male-female connector 4. A double male connector 6 is installed on the top of the time-delay transmission device 7, and a third cluster of perforating guns 5 is connected via the double male connector 6. A pressure opening detonator 3 is installed at the top of the third cluster of perforating guns 5 via a male-female connector 4. The top of the pressure opening detonator 3 is connected to the continuous tubing 1 via a conversion connector 2. Regarding the technical solution of this embodiment, the perforation transmission unit located below the double male blind plug connector 9 includes a second cluster of perforation guns 10 connected to the bottom of the double male blind plug connector 9. The bottom end of the second cluster of perforation guns 10 is connected to a time-delay transmission device 7 via a male-female connector 4. The bottom end of the time-delay transmission device 7 is connected to a first cluster of perforation guns 11 via a double male connector 6. The bottom end of the first cluster of perforation guns 11 is connected to a gun tail pressure initiator 12 via a male-female connector 4.

[0031] Furthermore, the tail pressure detonator 12 is connected to the continuous oil pipe 1 and the casing annulus, while the pressure opening detonator 3 is only connected to the continuous oil pipe 1, and the continuous oil pipe 1 is not connected to the annulus.

[0032] It should be further explained that the time-delay detonator 7 is a common component in the prior art. It usually includes a hydraulic delay mechanism or a chemical delay element, which is used to delay the detonation wave to the next stage perforation gun or detonation element after receiving the detonation signal for a predetermined time (e.g., 5-30 minutes). It is widely used in oil perforation operations and can achieve the purpose of precise detonation and layered operation.

[0033] Furthermore, the pressure-opening detonator 3 is a mechanical pressure-opening detonation device. When the pressure inside the continuous tubing reaches the set value, the pressure pushes the sealing piston downward, and through the guide seat and push rod, the firing pin strikes the flame cap, igniting the delayed charge and achieving timed detonation. This pressure-opening detonator 3 is a common component in the prior art and is widely used in the field of oil and gas well perforation operations. The pressure-opening detonator 3 simultaneously opens the flow channel between the tubing string and the annulus, facilitating subsequent operations.

[0034] Furthermore, the tail pressure initiator 12 is a device installed at the tail of the perforating gun, which is detonated by pressurizing the annular fluid in the tubing and casing, thereby detonating the perforating gun. The tail pressure initiator 12 is also a common component in the prior art. Its function and structure are similar to the pressure opening initiator mentioned above. It also responds to the wellbore fluid pressure reaching a predetermined threshold and its main function is to provide redundant detonation paths or for specially designed tubing structures (such as those requiring detonation from the tail). The tail pressure initiator 12 also includes a pressure-sensitive element (piston / diaphragm), a shear pin, an impact pin, and a main charge.

[0035] Specifically, according to Figure 1The connection sequence shown is as follows: connect each perforating tool sequentially from top to bottom at the wellhead, ensuring a secure and accurate connection. Then, run the tubing string into the target formation as required, aligning the first cluster of perforating guns 11 with the first cluster of perforations. Next, pressurize the annulus between the coiled tubing 1 and the casing, activating the tail pressure initiator 12. The tail pressure initiator 12 then detonates the first cluster of perforating guns 11. Afterward, the first cluster of perforating guns 11 activates the time-delay detonator 7. During the delay period, raise the perforating string, aligning the second cluster of perforating guns 10 with the second cluster of perforations, and wait here. After determining that the second cluster of perforating guns 10 has detonated, continue to raise the perforation string so that the third cluster of perforating guns 5 are aligned with the third cluster of perforations. At this time, pressurize the coiled tubing 1 to fire the pressure opening detonator 3. The pressure opening detonator 3 detonates the third cluster of perforating guns 5, which in turn detonates the delay detonator 7. During the delay period, raise the perforation string so that the fourth cluster of perforating guns 8 are aligned with the fourth cluster of perforations. Wait here. When it is determined from the ground that the fourth cluster of perforating guns 8 has detonated, the cluster perforation has been completed, and the coiled tubing 1 can be raised to the wellhead.

[0036] The following description, in conjunction with the accompanying drawings and embodiments, provides a further explanation of the continuous tubing 1 for transporting clustered perforated tubing provided by this utility model.

[0037] A continuous tubing 1 for transporting clustered perforated tubing includes two sets of perforation and detonation transmission units. The two sets of perforation and detonation transmission units are connected by a double male blind plug joint 9, and the two sets of perforation and detonation transmission units are arranged in a mirror symmetrical manner with respect to the double male blind plug joint 9.

[0038] In the two sets of perforation detonation units, the perforation detonation unit located above the double male blind plug joint 9 is connected to the coiled tubing 1 and the casing annulus, while the perforation detonation unit located below the double male blind plug joint 9 is only connected to the coiled tubing 1, and the coiled tubing 1 is not connected to the casing annulus.

[0039] In practical use, the lifting device adjusts the explosion position according to the detonation sequence of the perforation transmission unit to achieve cluster perforation.

[0040] The working principle and usage procedure of this utility model are as follows: First, connect all perforating equipment sequentially from top to bottom at the wellhead, ensuring a firm and accurate connection. Then, lower the tubing string into the target formation in the well as required, aligning the first cluster of perforating guns 11 with the first cluster of perforations. Next, pressurize the annulus between the coiled tubing 1 and the casing, igniting the gun tail pressure initiator 12. The gun tail pressure initiator 12 then detonates the first cluster of perforating guns 11. Afterward, the first cluster of perforating guns 11 fires the time-delay detonator 7. During the delay period, the perforating tubing string is raised, aligning the second cluster of perforating guns 10 with the second cluster of perforations. While waiting, once it is determined that the second cluster of perforating guns 10 has detonated, continue to raise the perforation string so that the third cluster of perforating guns 5 are aligned with the third cluster of perforations. At this time, pressurize the coiled tubing 1 to fire the pressure opening detonator 3. The pressure opening detonator 3 detonates the third cluster of perforating guns 5, which in turn detonates the delay detonator 7. During the delay period, raise the perforation string so that the fourth cluster of perforating guns 8 are aligned with the fourth cluster of perforations. While waiting, once it is determined from the ground that the fourth cluster of perforating guns 8 has detonated, the cluster perforation is complete, and the coiled tubing 1 can be raised to the wellhead.

[0041] In this invention, the term "plural" refers to two or more items unless otherwise expressly defined. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items. The terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0042] It should be noted that when a component is referred to as being "assembled on," "mounted on," "fixed to," or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0043] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0044] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A continuous tubing delivery cluster perforation string, characterized in that, It includes two sets of perforation detonation transmission units, which are connected by a double male blind plug joint (9), and the two sets of perforation detonation transmission units are arranged in a mirror symmetrical manner with the double male blind plug joint (9) as the symmetry. In the two sets of perforation detonation units, the perforation detonation unit located above the double male blind plug joint (9) is connected to the coiled tubing (1) and the casing annulus, while the perforation detonation unit located below the double male blind plug joint (9) is only connected to the coiled tubing (1), and the coiled tubing (1) is not connected to the casing annulus. In actual use, the lifting device adjusts the explosion position according to the detonation sequence of the perforation transmission unit to achieve cluster perforation.

2. The coiled tubing (1) conveying clustered perforation string according to claim 1, characterized in that, The perforation detonation unit located above the double male blind plug joint (9) includes a fourth cluster of perforating guns (8) connected to the top of the double male blind plug joint (9). A time-delay detonator (7) is connected above the fourth cluster of perforating guns (8) via a male-female connector (4). A double male connector (6) is installed on the top of the time-delay detonator (7), and a third cluster of perforating guns (5) is connected via the double male connector (6). A pressure opening detonator (3) is installed at the top of the third cluster of perforating guns (5) via a male-female connector (4). The top of the pressure opening detonator (3) is connected to the coiled tubing (1) via a conversion connector (2).

3. The coiled tubing (1) conveying clustered perforation string according to claim 2, characterized in that, The perforation detonation unit located below the double male blind plug connector (9) includes a second cluster of perforating guns (10) connected to the bottom of the double male blind plug connector (9). The bottom end of the second cluster of perforating guns (10) is connected to a time-delay detonator (7) via a male-female connector (4). The bottom end of the time-delay detonator (7) is connected to a first cluster of perforating guns (11) via a double male connector (6). The bottom end of the first cluster of perforating guns (11) is connected to a gun tail pressure detonator (12) via a male-female connector (4).

4. A coiled tubing (1) conveying clustered perforation string according to claim 3, characterized in that, The tail pressure detonator (12) is connected to the coiled tubing (1) and the casing annulus, while the pressure opening detonator (3) is only connected to the coiled tubing (1), and the coiled tubing (1) is not connected to the annulus.

Images