Jet flow unblocking and filling integrated process pipe column

Abstract

The utility model discloses a jet flow unblocking and filling integrated process pipe column which comprises a packer, a negative pressure generating device arranged at the upper end of the packer and a pressure measuring device arranged at the lower end of the packer, and the lower end of the pressure measuring device is connected with a filling and jet flow unblocking unit. According to the utility model, the integrated construction of plug removal, pressure measurement, filling and sand prevention of an oil layer section can be completed by one pipe column, the functions of plug removal, pressure measurement and filling are integrated, the construction period can be effectively shortened, and the conditions of subsequent sand production and the like which influence production and are caused by reservoir deficiency can be effectively avoided by filling after plug removal. The pressure measuring device can effectively judge the reservoir blockage condition, and powerful data support is provided for knowing the reservoir blockage degree and conducting design optimization of follow-up filling parameters.

Description

Technical Field

[0001] The utility model relates to the technical field of oil field development, in particular to a jetting and filling integrated process pipe column. Background Art

[0002] After a new well is drilled and completed, there is a large amount of mud pollution. With the production of the oil well, a large amount of blockages will be generated due to the migration of particles, the precipitation of polymers, waxes, and cementing materials, which seriously affects the normal production of the oil well. At present, the commonly used methods of unblocking include acidification, negative pressure flowback, jet unblocking and other measures. After unblocking, the flowback will discharge the blockages and even the sand in the near-well formation, forming a certain deficit area, which affects the stability of the reservoir near the well to a certain extent. After unblocking, the tubing string is lowered for filling construction. On the one hand, the construction period is long and the process is complicated. On the other hand, the lifting of the tubing string will cause a certain degree of fluctuation in the liquid column in the well. The remaining uncleaned blockages may block the formation again. At the same time, it has a certain impact on the stability of the well wall and the reservoir near the well.

[0003] In view of the above problems, in order to simplify the process and improve the jet unblocking and sand control effects, it is necessary to develop an integrated process string for jet unblocking and filling to realize the integrated construction of jet unblocking, pressure measurement and filling, and the process is simple and reliable.

[0004] Publication No.: CN116480321A, discloses a side-drilling horizontal well large-diameter open hole filling and pickling integrated pipe string and its operation method, which realizes the integrated construction of sand prevention and pickling after drilling the side-drilling horizontal well, has a short construction period, effectively prevents well wall collapse, and reduces drilling mud pollution; the pipe string is provided with a fixed pipe string backwashing device, which can realize the backwashing of the well with a fixed pipe string through the backwashing liquid flow channel design, thereby improving the safety of the operation.

[0005] Announcement No.: CN208534434U, discloses an integrated process string for uniform jetting and unblocking and filling, which can complete the screen jetting, near-well uniform pickling and unblocking, extrusion, and circulating filling sand control construction of the long well section of the horizontal well in one trip. There are several jetting unblocking tools on the process string, which can achieve uniform acid distribution in the oil layer through optimized design, and can flush the blockage to ensure a good unblocking effect.

[0006] Announcement No.: CN212563173U, discloses a jetting unblocking process string for open-hole screen completion of horizontal wells in heavy oil blocks. Through the implementation of this set of process strings, the fine sand and sludge near the open-hole screen are solved, the blockage is removed, the potential of the oil well is released, and the purpose of normal production of the oil well is achieved; and the backflow can be quickly carried out to avoid engineering accidents caused by sludge and sand stuck in the process string.

[0007] The above-mentioned existing technologies are all unable to measure pressure, unable to accurately simulate and calculate the blockage and deficit of the oil layer, and unable to obtain the best filling parameters.

[0008] In short, the technical solutions of the above-disclosed technologies, the technical problems to be solved and the beneficial effects produced are all different from the present utility model. Regarding more technical features, technical problems to be solved and the beneficial effects of the present utility model, there is no technical inspiration in the above-disclosed technical documents. Utility Model Content

[0009] In view of the above-mentioned defects in the prior art, the purpose of the utility model is to provide an integrated process string for jet unblocking and filling, so as to complete the jet oscillation unblocking of oil layer blockages, pressure measurement, and filling and sand control construction in one trip of the string, thereby ensuring a good unblocking effect on the oil layer, giving full play to the production capacity of the oil well, and achieving the best sand control production effect; at the same time, the string simplifies the construction process by optimizing the structural design, greatly improves the construction efficiency and construction success rate, reduces the operating cost, and prolongs the life of the sand control well.

[0010] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0011] The jet unblocking and filling integrated process string comprises a packer, a negative pressure generating device arranged at the upper end of the packer, and a pressure measuring device arranged at the lower end of the packer, wherein the lower end of the pressure measuring device is connected to the filling jet unblocking unit.

[0012] Furthermore, the negative pressure generating device comprises a negative pressure hole wall, a flow guide nozzle, and a wall-clamped tube;

[0013] Specifically, the negative pressure hole wall is arranged on the inner wall of the negative pressure generating device, and the center of the negative pressure hole wall is a negative pressure flow channel with a blunt cone angle at the bottom of the horn;

[0014] Specifically, the flow guide nozzle is below the negative pressure flow passage, and the flow guide nozzle is connected to the outside of the negative pressure generating device;

[0015] Specifically, the clamped wall tube is arranged on the wall of the negative pressure generating device and is located below the flow guide nozzle;

[0016] Specifically, the sandwich tube is a one-way open channel, which opens when the external pressure of the negative pressure generating device is greater than the internal pressure.

[0017] Furthermore, the upper end of the negative pressure generating device is connected to an oil pipe.

[0018] Furthermore, the pressure measuring device is connected to the filling jet unblocking unit through an adjusting oil pipe.

[0019] Furthermore, the filling jet unblocking unit comprises a filling device, a rotating jet unblocking device, and an unblocking safety device which are connected in sequence.

[0020] Furthermore, a filling port is provided on the wall of the filling device, and a blocking-unblocking filling conversion sleeve and a cutting ring are provided inside the filling device;

[0021] Specifically, a convex ring is provided on the outer wall of the lower end of the unblocking and filling conversion sleeve, and the convex ring contacts and seals with the inner wall of the filling device below the filling port;

[0022] Specifically, the cutting ring is arranged between the outer wall of the unblocking and filling conversion sleeve and the inner wall of the filling device, and the shear nails are passed through the outer wall of the filling device and the cutting ring, and inserted into the unblocking and filling conversion sleeve to complete the fixation; sealing rings are arranged above the shear nails on the inner and outer walls of the cutting ring.

[0023] Furthermore, the rotating jet unblocking device is provided with at least two nozzles at an angle;

[0024] Specifically, two spring sheets are arranged inside the nozzle and are symmetrically distributed along the axis. The spring sheets are elastic and are drawn out from the inner wall of the nozzle and extend to the nozzle opening after smooth transition.

[0025] Specifically, the front end of the inner wall of the nozzle is configured to be conical, serving as a ball seat.

[0026] Furthermore, the contraction angle of the cone at the front end of the nozzle is 15°, and the setting angle of the nozzle is 12°.

[0027] Furthermore, a check valve is provided at the lower end of the interior of the unblocking safety device.

[0028] Compared with the prior art, the utility model has the following beneficial effects:

[0029] 1. The utility model can realize the integrated construction of unblocking, pressure measurement and filling for sand prevention in the oil layer section in one trip of the tubing string. It integrates the functions of unblocking, pressure measurement and filling, which can effectively shorten the construction period. Filling after unblocking can effectively avoid the subsequent sanding caused by reservoir depletion and other situations that affect production.

[0030] 2. The structural design of the jet filling conversion sleeve on the process string can realize the conversion between jetting and filling, and then complete the unblocking and filling operations in one trip of the string, which is simple to operate, safe and reliable.

[0031] 3. The pressure measuring device can effectively judge the blockage of the reservoir, and provide strong data support for understanding the degree of reservoir blockage and designing and optimizing subsequent filling parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of the utility model of the jet plugging removal and filling integrated process pipe column;

[0033] Figure 2 It is a structural schematic diagram of the nozzle in the utility model;

[0034] Figure 3 It is a structural schematic diagram of the filling device in the utility model;

[0035] Figure 4 This is a schematic diagram of the negative pressure unblocking process of the utility model;

[0036] Figure 5 This is a schematic diagram of the jet unblocking process of the utility model;

[0037] Figure 6 This is a schematic diagram of negative pressure return after jet unblocking of the utility model;

[0038] Figure 7 This is a schematic diagram of the filling and sand control process of the utility model;

[0039] Figure 8 It is a schematic diagram of a backwash well of the utility model.

[0040] In the figure: casing 1, oil pipe 2, oil casing annulus 3, negative pressure generating device 4, packer 5, pressure measuring device 6, filling device 7, rotary jet unblocking device 8, unblocking safety device 9, oil layer 10;

[0041] Negative pressure hole wall 401, negative pressure flow channel 402, flow guide nozzle 403, clamped wall tube 404;

[0042] Filling port 701, unblocking filling conversion sleeve 702, cutting ring 703, shear pin 704;

[0043] Nozzle 801 , spring 802 , and check valve 901 . DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0045] Embodiment 1:

[0046] See also Figure 1 to Figure 2 The utility model provides an integrated process string for jet unblocking and filling, comprising an oil pipe 2, a negative pressure generating device 4, a packer 5, a pressure measuring device 6, a filling device 7, a rotating jet unblocking device 8, and an unblocking safety device 9, which are sequentially connected from top to bottom.

[0047] The upper end of the negative pressure generating device 4 is connected to the thread of the oil pipe. The negative pressure generating device 4 includes a negative pressure hole wall 401, a flow guide nozzle 403, and a wall-clamped tube 404. The negative pressure hole wall 401 is arranged on the inner wall of the negative pressure generating device 4. The center of the negative pressure hole wall 401 is a negative pressure flow passage 402 with a blunt cone angle connected to a trumpet. The flow guide nozzle 403 is below the negative pressure flow passage 402. The flow guide nozzle 403 is connected to the outside of the negative pressure generating device 4. When the liquid enters the negative pressure flow passage 402 through the flow guide nozzle 403, negative pressure will be formed, which can promote the discharge of blockages in the well along with the liquid. The wall-clamped tube 404 is arranged on the wall of the negative pressure generating device 4, located below the flow guide nozzle 403, and is a one-way open channel. It opens when the external pressure of the negative pressure generating device 4 is greater than the internal pressure. When the oil pipe gate is closed and squeezed, it opens to form a liquid flow passage.

[0048] The pressure measuring device 6 is threadedly connected to the lower part of the packer 5, and is used to measure the liquid pressure at the location. Usually, the pressure measuring device 6 measures the pressure once before and after unblocking, which can be used to judge the blockage situation downhole, and provide a basis for better understanding the reservoir blockage and subsequent simulation calculation of parameters such as filling volume.

[0049] Preferably, an adjusting oil pipe is provided between the pressure measuring device 6 and the filling device 7 to adjust the length of the pipe string, and the lower end of the pressure measuring device 6 is threadedly connected to the upper end of the adjusting oil pipe.

[0050] The upper end of the filling device 7 is threadedly connected to the lower end of the regulating oil pipe, and a filling port 701 is arranged on the wall of the filling device 7. A blocking-free filling conversion sleeve 702 and a cutting ring 703 are arranged inside the filling device 7. A convex ring is arranged on the outer wall of the lower end of the blocking-free filling conversion sleeve 702, and the convex ring contacts and seals with the inner wall of the filling device 7 below the filling port 701. The cutting ring 703 is arranged between the outer wall of the blocking-free filling conversion sleeve 702 and the inner wall of the filling device 7. The shear nails 704 pass through the outer wall of the filling device 7 and the cutting ring 703, and the blocking-free filling conversion sleeve 702 is inserted to complete the fixation. The inner and outer walls of the cutting ring 703 are both provided with sealing rings above the shear nails 704. When the pressure inside the filling device 7 is greater than the external pressure, the cutting ring 703 applies pressure to the shear nails 704 until the shear nails 704 are cut off. At this time, the blocking-free filling conversion sleeve 702 falls and exposes the filling port 701.

[0051] The upper end of the rotary jet unblocking device 8 is threadedly connected to the lower end of the filling device 7. The rotary jet unblocking device 8 is provided with at least two nozzles 801 at an angle. Two spring pieces 802 symmetrically distributed along the axis are provided inside the nozzle 801. The spring pieces 802 are elastic and can vibrate under the action of high-pressure liquid, thereby flushing and vibrating the oil layer 10. The two spring pieces 802 are led out from the inner wall of the nozzle 801, and extend out of the nozzle 801 after a smooth transition. The front end of the inner wall of the nozzle 801 is set to a cone as a ball seat.

[0052] The filling port 701 is in a closed state during the jet unblocking process. When the unblocking is completed and filling construction is required, a temporary blocking ball is pumped in first. The temporary blocking ball sits on the ball seat to block the nozzle 801 on the rotating jet unblocking device 8. After pressurizing to a certain pressure, the cutting ring 703 on the filling device 7 is forced to cut off the shear pin 704, so that the unblocking and filling conversion sleeve 702 moves downward, and the filling port 701 leaks out, thereby realizing the filling function.

[0053] The upper end of the unblocking safety device 9 is threadedly connected to the lower end of the rotary jet unblocking device 8. A check valve 901 is provided at the lower end inside the unblocking safety device 9. When the packer is not sealed or after the packer is unsealed, it is used for large-volume backwashing of the well, which greatly increases the reliability and safety of the pipe string during the process implementation.

[0054] It should be noted that the pressure measuring device 6 and the packer 5 are prior art. The utility model sets them at appropriate positions, and their structures are clear to those skilled in the art.

[0055] Embodiment 2:

[0056] On the basis of Example 1, in this embodiment, the contraction angle of the cone at the front end of the nozzle 801 is 15°, and the nozzle 801 is threadedly connected to the rotary jet deblocking device 8. The arrangement angle of the nozzle 801 is 12°, which can produce a better tangential force range and tangential force size, and can effectively achieve jet disturbance deblocking in a larger area, which can effectively improve the deblocking effect.

[0057] Embodiment 3:

[0058] Based on Example 1, this example provides a method for using a jet unblocking and filling integrated process column, which specifically includes the following steps:

[0059] S1, such as Figure 1 As shown, the jet unblocking and filling integrated process string is lowered into the designed position in the well; the packer 5 is set and sealed; and the pressure measuring device 6 measures the pressure at the current position.

[0060] S2, such as Figure 4As shown, the tubing gate and casing gate are both open, and high-pressure liquid enters the tubing 2 through the casing annulus 3, and enters the negative pressure flow channel 402 through the guide nozzle 403, forming a negative pressure to promote the discharge of the blockage in the well along with the liquid;

[0061] Observe the liquid returning from the outlet until it is clean.

[0062] S3, such as Figure 5 As shown, the oil pipe gate is closed, and the high-pressure liquid enters the oil pipe 2 through the oil casing annulus 3 and the wall pipe 404, and then enters the rotating jet unblocking device 8 downward. The high-pressure liquid passes through the nozzle 801 and impacts the shrapnel 802 to form a rotating oscillating jet, which performs jet oscillation unblocking on the oil layer 10.

[0063] S4, such as Figure 6 As shown, the oil pipe gate is opened, and the high-pressure liquid enters the oil pipe through the oil casing annulus 3, and enters the negative pressure flow channel 402 through the guide nozzle 403, forming a negative pressure, which promotes the discharge of the blockage in the well along with the liquid. And observe the liquid returned from the outlet until the returned liquid is clean.

[0064] S5, the pressure measuring device 6 measures the pressure at the current position, and simulates and calculates the blockage and deficit of the oil layer 10 according to the twice measured pressures and the situation of the return material after unblocking, so as to design relevant filling parameters.

[0065] S6. After the unblocking is completed, the oil pipe gate is closed, and the temporary plugging ball is pumped into the oil casing annulus 3, enters the oil pipe through the clamped wall pipe 404, and enters the rotating jet unblocking device 8 downward to block the nozzle 801. At this time, the pressure is continued to be increased to a certain pressure, and the shear nail 704 is cut off by the cutting ring 703, so that the unblocking filling conversion sliding sleeve 702 moves downward to expose the filling port 701. At this time, the sand control filling construction can be carried out.

[0066] S7, such as Figure 7 As shown, the designed amount of clean water and sand consolidating agent plugs are pumped into the casing annulus 3, and the clean water and sand consolidating agent plugs enter the oil pipe through the sandwich pipe 404 and are squeezed into the oil layer 10 through the filling port 701.

[0067] S8. Unseal the packer 5, pull out the jet unblocking and filling integrated process string, and wait for solidification.

[0068] S9, such as Figure 8 As shown, after the solidification is completed, in order to completely remove the pollutants in the wellbore, a large-volume backwash can be carried out, and the jet flow unblocking and filling integrated process string is lowered without setting the seal. The liquid enters from the oil casing annulus, goes down through the check valve 901 of the unblocking safety device 9 into the inside of the oil pipe 2, and returns to the wellhead.

[0069] The utility model realizes that during positive circulation, a large flow of high-pressure unblocking liquid can be supplied to the rotating jet unblocking device for jet unblocking; during reverse circulation, the oil in the oil well can still be better lifted to the ground through the negative pressure generating device, saving time and cost, and improving the reliability of construction. A pressure measuring device is also provided, which can analyze the pressure situation before and after unblocking to clarify the blockage of the oil layer, and then provide a basis for the next filling. Through the design of the unblocking and filling conversion sleeve, a one-trip pipe column filling construction after unblocking is realized, the construction is simple and reliable, and the subsequent sand production caused by the reservoir deficit after unblocking is effectively avoided to affect production.

[0070] All components and connection methods of components not discussed in this application belong to the known technologies in this technical field and can be directly applied without further explanation.

[0071] In the present invention, the term "plurality" means two or more than two, unless otherwise clearly defined. The terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0072] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as "up", "down", "left", "right", "front" and "back" are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, cannot be understood as a limitation on the present invention.

[0073] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation 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.

[0074] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. The integrated process string for jetting and filling includes a packer, characterized in that: It also includes a negative pressure generating device arranged at the upper end of the packer and a pressure measuring device arranged at the lower end of the packer, wherein the lower end of the pressure measuring device is connected to a filling jet unblocking unit; The negative pressure generating device comprises a negative pressure hole wall, a flow guide nozzle, and a wall-clamping tube; The negative pressure hole wall is arranged on the inner wall of the negative pressure generating device, and the center of the negative pressure hole wall is a negative pressure flow passage in the shape of a trumpet connected to a blunt cone angle; The flow guide nozzle is below the negative pressure flow passage, and the flow guide nozzle is connected to the outside of the negative pressure generating device; The wall-clamped tube is arranged on the wall of the negative pressure generating device and is located below the flow guide nozzle; The sandwich wall tube is a one-way opening channel, which opens when the external pressure of the negative pressure generating device is greater than the internal pressure.

2. The jet unblocking and filling integrated process column according to claim 1 is characterized in that: The upper end of the negative pressure generating device is connected to the oil pipe.

3. The jet-unblocking and filling integrated process column according to claim 1 is characterized in that: The pressure measuring device is connected to the filling jet unblocking unit through an adjusting oil pipe.

4. The jet-unblocking and filling integrated process column according to any one of claims 1 to 3, characterized in that: The filling jet unblocking unit comprises a filling device, a rotating jet unblocking device and an unblocking safety device which are connected in sequence.

5. The jet-unblocking and filling integrated process column according to claim 4 is characterized in that: A filling port is arranged on the wall of the filling device, and a blocking-unblocking filling conversion sleeve and a cutting ring are arranged inside the filling device; The outer wall of the lower end of the unblocking and filling conversion sleeve is provided with a convex ring, and the convex ring contacts and seals with the inner wall of the filling device below the filling port; The cutting ring is arranged between the outer wall of the unblocking and filling conversion sleeve and the inner wall of the filling device, and the shear nails are passed through the outer wall of the filling device and the cutting ring, and inserted into the unblocking and filling conversion sleeve to complete the fixation; sealing rings are arranged above the shear nails on the inner and outer walls of the cutting ring.

6. The jet-unblocking and filling integrated process column according to claim 4 is characterized in that: The rotating jet unblocking device is provided with at least two nozzles at an angle; Two spring sheets are arranged inside the nozzle and are symmetrically distributed along the axis. The spring sheets are elastic and are drawn out from the inner wall of the nozzle and extend to the nozzle opening after smooth transition. The front end of the inner wall of the nozzle is configured to be conical and serves as a ball seat.

7. The jet unblocking and filling integrated process column according to claim 6, characterized in that: The contraction angle of the cone at the front end of the nozzle is 15°, and the setting angle of the nozzle is 12°.

8. The jet-unblocking and filling integrated process column according to claim 4 is characterized in that: A check valve is arranged at the lower end of the interior of the blocking relief safety device.

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