Explosion shaping device for deformed casing pipe

Abstract

A deformation casing explosion shaping device is of a columnar structure as a whole, the maximum outer diameter of the deformation casing explosion shaping device is smaller than the minimum inner diameter of a deformation casing, and the deformation casing explosion shaping device comprises an initiation mechanism and a shaping mechanism which are coaxially connected from top to bottom; shaping explosives are arranged in the shaping mechanism and are in signal connection with the detonating mechanism. Through reasonable arrangement of component structures, the device is transmitted to a to-be-shaped position in a casing during use, energy is transmitted to shaping explosives in the shaping mechanism through the detonating mechanism, and the shaping explosives are detonated to achieve casing shaping; the whole device structure is easy to implement, applicable to various working conditions, short in construction period and high in shaping efficiency; according to the position and the type of the casing pipe, the matched transmission mode and ignition mode can be selected, and the application range is wider.

Description

TECHNICAL FIELD

[0001] The utility model belongs to oil and gas field workover technical field, concretely relates to a deformed casing explosive shaping device. BACKGROUND

[0002] In the field of oil and gas field development, with the oil and gas well development into the middle and later period, oil and gas well casing will be damaged to different degrees due to geological reasons and engineering reasons, will damage the oil and gas well shaft integrity, reduce the oil and gas well production. In recent years, China has developed unconventional oil and gas resources, including deep shale gas, tight gas, coalbed methane, natural gas hydrate and the like. In the process of shale gas exploration and development, the casing of the gas well is deformed after cementing or during reservoir reconstruction, and even the "deformation before compression" phenomenon occurs before exploitation, the tool string cannot pass through the deformation point after the casing is deformed, which seriously restricts the normal development and production of oil and gas fields.

[0003] For the repair of the deformed casing, mechanical shaping includes hydraulic shaping, casing mechanical milling, hydraulic milling and other means, but this method requires small casing deformation, low applicability, and the mechanical shaping method has a long construction period and low shaping efficiency. SUMMARY

[0004] In view of the above problems, the utility model aims at providing a deformed casing explosive shaping device to solve the problems of low applicability, long construction period and low shaping efficiency of the existing mechanical shaping technology.

[0005] To achieve the above object, the technical scheme adopted by the utility model comprises:

[0006] A deformed casing explosive shaping device, the whole is columnar structure and the maximum outer diameter is less than the minimum inner diameter of the deformation casing, comprising an initiation mechanism and a shaping mechanism coaxially connected from top to bottom; The shaping mechanism is provided with a shaping explosive, and the shaping explosive is signal connected with the initiation mechanism.

[0007] Preferably, the shaping mechanism comprises a cylindrical shell with a sealed inner cavity, and the cylindrical shell is provided with a shaping explosive.

[0008] Preferably, the lower end of the cylindrical shell is provided with a tail that seals the inner cavity of the cylindrical shell, and the outer periphery of the free end of the tail is provided with a chamfer.

[0009] Preferably, the initiation mechanism comprises an initiation connector, the upper end of the initiation connector is provided with an upper connector, and the lower end of the initiation connector is connected with the upper end of the cylindrical shell through a connecting sleeve.

[0010] Preferably, the initiation connector is an electric initiation connector.

[0011] Preferably, the initiation connector is a pressure initiation connector.

[0012] Preferably, the initiation connector is an impact initiation connector.

[0013] Preferably, the overall minimum outer diameter is 45mm.

[0014] Compared with the prior art, the device has the advantages of:

[0015] (1) The device is easy to implement, can be applied to various working conditions, has a short construction period and high shaping efficiency.

[0016] (2) The device has wide applicability. BRIEF DESCRIPTION OF DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the device, and constitute a part of the specification, and are used to explain the device together with the specific embodiments below, but do not constitute a limitation on the device. In the drawings:

[0018] Figure 1 Fig. 1 is a structural schematic view of the device. DETAILED DESCRIPTION

[0019] The device is not limited to the following specific embodiments, and any equivalent transformation based on the technical solutions of the present application falls within the protection scope of the device.

[0020] It should be noted that the directional terms mentioned in the present application, such as "inner cavity", "lower end" and the like, are consistent with the specific directions on the paper in the drawings or the corresponding directions of the space shown in the drawings; all components and devices in the device, such as those without special instructions, are all known components and devices in the prior art.

[0021] The present application discloses a device for shaping a deformed casing by explosion, which is in a columnar structure and has a maximum outer diameter smaller than the minimum inner diameter of the deformed casing, and comprises an initiating mechanism and a shaping mechanism 4 arranged coaxially from top to bottom; the shaping mechanism 4 is provided with shaping explosives, and the shaping explosives are signal-connected with the initiating mechanism.

[0022] The device is used to transmit the device to the position to be shaped in the casing, transmit energy from the initiating mechanism to the shaping explosives in the shaping mechanism 4, detonate the shaping explosives to shape the casing; the device has an easy-to-implement structure, can be applied to various working conditions, has a short construction period and high shaping efficiency.

[0023] During the process of lifting and lowering, the well logging data and the tension of the pipe string should be observed at any time to prevent resistance or sticking. When the device is lowered to 20m away from the upper end point of the section to be shaped, the lowering speed should be slow, and the load change should be observed in particular. The shaping system is slowly sent to the designed position.

[0024] The shaping mechanism 4 comprises a cylindrical shell 4-1 with a sealed inner cavity, and the shaping explosive is arranged in the cylindrical shell 4-1. The lower end of the cylindrical shell 4-1 is provided with a bullet tail 4-2 for sealing the inner cavity of the cylindrical shell 4-1, so that the shaping explosive is isolated from the wellbore before explosion. The outer periphery of the free end of the bullet tail 4-2 is provided with a chamfer, so that the device can be smoothly conveyed to the position to be shaped.

[0025] In this embodiment, the cylindrical shell 4-1 is made of a soluble material. After the casing shaping operation, the cylindrical shell 4-1 is blasted and left in the casing, and most of the fragments of the outer shell of the shaping device are discharged through the wellhead circulating liquid. A small part of larger fragments or fragments that are difficult to discharge can be chemically reacted with the well fluid to dissolve by itself, without subsequent treatment, and will not affect the subsequent operation. The cylindrical shell 4-1 can withstand a pressure of 90MPa, and the device as a whole can withstand a temperature of 160℃ / 24h, which can meet the temperature resistance requirements of most high-temperature wells.

[0026] The detonation mechanism comprises a detonation connector 2, and the upper end of the detonation connector 2 is provided with an upper connector 1. The lower end of the detonation connector 2 is connected with the upper end of the cylindrical shell 4-1 through a connecting sleeve 3.

[0027] The detonation connector 2 in this embodiment can be selected as an electric detonation connector, a pressure detonation connector or a percussion detonation connector, so as to adapt to various types of well conditions / transmission modes.

[0028] After the explosion shaping is completed, the detonation mechanism is taken out of the wellhead, and the whole shaping operation is completed.

[0029] In actual working conditions, the deformation condition of the deformed section is comprehensively analyzed through the logging curve, the type of the shaping mechanism 4 can be determined according to different well conditions, such as electric detonation, pressure detonation or percussion detonation. The maximum outer diameter size of the device is determined by the severity of casing deformation. The minimum outer diameter of the device of the present application is 45mm, and its applicability is wider than that of mechanical shaping. Then, the maximum length of the casing device is determined by the length of the casing deformation section. In theory, the larger the outer diameter size and the longer the length of the casing shaping device, the more obvious the shaping effect. However, in practice, the larger the outer diameter size and the longer the length, the more difficult the pipe string transmission, and an optimal solution should be selected among the outer diameter size, the length and the shaping effect of the shaping device to achieve the best shaping effect under actual conditions.

[0030] In actual working conditions, casing deformation of oil and gas well can occur in vertical section, deviated section and horizontal section. The patent proposes an explosive casing shaping device, which can be transmitted by coiled tubing, cable or oil pipe and drill pipe. The ignition mode of the device is also optional, including electric ignition, pressure ignition and impact ignition. Generally speaking, the cost of using coiled tubing transmission is the highest, the cost of using cable transmission is the second, and the cost of using oil pipe and drill pipe transmission is the lowest. According to the different positions of casing deformation, the most economical transmission mode can be selected, and the ignition mode is selected according to the transmission mode. The transmission mode and ignition mode are selected through the following table.

[0031] Table 1 Transmission type selection of casing explosive shaping device

[0032]

[0033] Table 2 Ignition mode selection of casing explosive shaping device

[0034]

[0035] Example 1

[0036] This example proposes an explosive shaping construction process of the device in the vertical well by cable transmission. Specifically,

[0037] ①Logging

[0038] The position and deformation degree of casing deformation are determined by multi-arm caliper logging and comprehensive interpretation report of casing deformation damage.

[0039] ②Running in hole

[0040] Run the simulation running-in-hole gauge to 10m below the casing deformation position with the cable, check the casing coupling data, mark the cable, and lower the cable at a speed of ≤2000m / h, and raise the cable at a speed of ≤3000m / h.

[0041] ③Explosive shaping of casing deformation section

[0042] Connect the explosive shaping tool string (hitch + CCL + electric initiation mechanism + shaping mechanism), connect the instrument power supply under the condition of disconnecting the ignition circuit, set the instrument depth to zero, lower the instrument into the well by not less than 70m, connect the slip ring line, check the conduction of the explosive shaping tool ignition line. Lower the cable at a speed of ≤2000m / h, and raise the cable at a speed of ≤3000m / h. During the lifting process, the magnetic positioner signal and tension change should be observed at any time to prevent resistance or sticking. Use the lifting position to determine that there is no error, ignite, and complete the shaping.

[0043] After ignition is confirmed, it should be stationary for 5 min, and after the downhole pressure is restored to be stable, the explosive shaping tool is pulled out of the wellhead at a speed of not more than 4000 m / h, and the pulled-out explosive shaping tool is checked.

[0044] (4) Well logging

[0045] The passage through the sleeve of the explosive shaping is confirmed by the multi-arm caliper logging, and the effect of the explosive shaping is evaluated.

[0046] Example 2

[0047] The present embodiment proposes an explosive shaping construction process of the device in the application transmitted through the coiled tubing in the high-deviation well or the horizontal well. Specifically, the explosive shaping construction process comprises the following steps.

[0048] (1) Well logging

[0049] The position and deformation degree of the sleeve deformation point are determined through the multi-arm caliper logging and the comprehensive interpretation report of the sleeve deformation damage.

[0050] (2) Pressure test

[0051] This step is completed according to the pressure test procedure, and will not be described here. The next step can be performed only after the pressure test is qualified.

[0052] (3) Running in hole

[0053] The running-in-hole tool string is connected, and the pipe string structure (from top to bottom) is as follows: coiled tubing + conversion joint + tubing short section + shock absorber + shock absorber + tubing short section + positioning joint + pressure opening detonation device + simulation shaping tool. The actual situation on site can be appropriately adjusted.

[0054] The coiled tubing is lowered at a speed of 15 m / min, and is pulled up once every 300-500 meters. The coiled tubing is lowered to approach the sleeve deformation point position, and is lowered at a speed of 5 m / min to explore the reduced diameter well section. When the hanging weight drops by 10 kN-20 kN, the resistance encountered position is determined by repeating the resistance encountered position twice, and the resistance encountered position and the hanging weight data are recorded.

[0055] (4) Explosive shaping construction of sleeve deformation point

[0056] The downhole tool string is connected, and the pipe string structure (from top to bottom) is as follows: coiled tubing + conversion joint + tubing short section + shock absorber + shock absorber + tubing short section + positioning joint + pressure detonation mechanism + shaping mechanism. The actual situation on site can be appropriately adjusted.

[0057] According to the speed of 15 m / min, the coiled tubing is pulled once every 300-500 meters, the coiled tubing is lowered to the vicinity of the casing deformation point, the coiled tubing is lowered to the target well section at a speed of 5 m / min, and the coiled tubing is pulled up by a certain length after reaching the blocked position, so as to complete the positioning. The pulling amount of this section is consistent with the coiled tubing elongation at the depth of the explosive shaping section. The purpose is to make the coiled tubing in a free state rather than a compressed state.

[0058] After the shaping tool is conveyed to the target layer, the ground pressure is started:

[0059] The pressure pipeline is connected, and the wellhead valve is closed;

[0060] The coiled tubing is pressurized to the specified pressure, and the wellhead vibration is detected during the pressurization process, which indicates that the initiator has worked (the specific pressure and the number of pins are set on site) ;

[0061] After the explosion, observe for 15 min, and pull up the coiled tubing;

[0062] According to the length of the shaped charge and other conditions, the pipe string is lowered, the positioning joint is verified, the explosion shaping result is verified until the resistance is encountered, and the related data is recorded in detail;

[0063] The pipe string in the well is pulled out.

[0064] ⑤Well diameter

[0065] Multi-arm caliper logging is performed to quantitatively describe the shaping effect of the shaped charge.

[0066] The preferred embodiments of the present disclosure are described in detail in combination with the drawings, but the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

[0067] In addition, it should be noted that various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combination manners.

[0068] In addition, various different embodiments disclosed in the present scheme can also be combined in any manner, as long as they do not deviate from the idea of the present disclosure, and they should also be considered as the contents invented by the present disclosure.

Claims

1. A deformed casing explosive shaping device characterized by, The whole is a columnar structure and the maximum outer diameter is less than the minimum inner diameter of the deformed sleeve, comprising an initiating mechanism and a shaping mechanism (4) arranged coaxially from top to bottom; The shaping mechanism (4) is internally provided with a shaping explosive, and the shaping explosive is signal-connected with the initiating mechanism; The shaping mechanism (4) comprises a cylindrical shell (4-1) with a sealed inner cavity, and the cylindrical shell (4-1) is internally provided with a shaping explosive; the lower end of the cylindrical shell (4-1) is provided with a bullet tail (4-2) for sealing the inner cavity of the cylindrical shell (4-1), and the outer periphery of the free end of the bullet tail (4-2) is provided with a chamfer.

2. The variable sheath explosive shaping device of claim 1, wherein, The initiating mechanism comprises an initiating connector (2), and the upper end of the initiating connector (2) is provided with an upper connector (1); a connecting sleeve (3) is arranged between the lower end of the initiating connector (2) and the upper end of the cylindrical shell (4-1).

3. The variable sheath explosive shaping device of claim 2, wherein, The initiating connector (2) is an electric initiating connector.

4. The variable sheath explosive shaping device of claim 2, wherein, The initiating connector (2) is a pressure initiating connector.

5. The variable sheath explosive shaping device of claim 2, wherein, The initiating connector (2) is an impact initiating connector.

6. The variable sheath explosive shaping device of claim 2, wherein, The minimum outer diameter of the whole is 45 mm.

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