Non-stop pump temporary plugging ball feeding device and fracturing system
By designing a continuous pump temporary ball throwing device, the rotating ball cylinder unit and remote control system are used to achieve multiple ball throwing and temporary ball throwing, solving the problem of the non-stop pumping and judging the temporary ball fall in the existing technology, and improving the continuity and accuracy of fracturing construction.
Patent Information
- Application Number
- CN202422580461.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-24
- Publication Date
- 2025-07-29
- Estimated Expiration
- 2034-10-24
AI Technical Summary
The prior art cannot achieve continuous pumping of temporary blockage of balls for multiple times, and it is impossible to promptly determine whether the temporary blockage ball completely falls into the high-pressure pipe cluster, which affects the continuity and accuracy of the fracturing transformation process.
A non-stop pump temporary ball throwing device is designed, including a rotating ball cylinder unit and a remote control system. Through the alternating operation of the hollow part of the rotating ball cylinder unit and the plug valve, multiple ball throwing is realized, and the placement is monitored through the visible cover unit to ensure accuracy.
The temporary plugging balls are achieved multiple times under continuous pumping conditions, ensuring the continuity and accuracy of fracturing construction, avoiding high-pressure fluid influx into the device, and reducing the risk of misjudgment.
Smart Images
Figure CN223164510U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of oil and gas well fracturing, and particularly relates to a non-stop pump temporary plugging ball adding device. On this basis, it also relates to a fracturing system. Background Art
[0002] The development of unconventional oil and gas reservoirs usually has the characteristics of tight lithology, strong heterogeneity, small porosity, and low permeability. The traditional natural exploitation method is difficult and cannot reach the economic output. Therefore, horizontal well fracturing technology is usually used to transform the reservoir to improve the productivity of oil and gas wells and thus improve economic benefits.
[0003] In horizontal well fracturing of unconventional oil and gas reservoirs, multi-cluster and close cutting processes are usually adopted. Due to the differences in in-situ stresses between clusters, multiple clusters cannot initiate or expand unevenly simultaneously, resulting in ineffective perforations. That is, during single-stage multi-cluster fracturing, the perforation clusters with lower stress preferentially take in fluid. When conducting general fracturing transformation, the perforation clusters with higher stress cannot take in fluid or take in less fluid.
[0004] In the prior art, to achieve full transformation of perforation clusters, the gunhole temporary plugging process is generally adopted. That is, after fracturing and transforming the preferentially taking-in-fluid clusters, the construction displacement is reduced, soluble material gunhole temporary plugging balls are added, and they are carried by the fracturing fluid to the gunholes of the already fractured clusters for temporary plugging. Then, the construction displacement is increased to fracture and transform the non-taking-in-fluid clusters. According to the number of perforation clusters and the stress differences between clusters, multiple ball throwing and temporary plugging operations can be carried out. Currently, the number of ball throwing and temporary plugging operations in China is 1 - 3 times to achieve full transformation of multiple clusters and improve the fracturing transformation effect.
[0005] However, in actual on-site applications, the following defects exist:
[0006] First, it is impossible to achieve non-stop pump multiple ball throwing. Existing ball throwing devices generally can only achieve single ball throwing and temporary plugging. For multi-cluster transformation that requires multiple ball throwing and temporary plugging operations, existing ball throwing devices need to stop the pump, shut down the well, relieve pressure, and then load the temporary plugging balls again, which cannot meet the requirements of continuous construction.
[0007] Second, it is impossible to timely judge whether the temporary plugging balls have completely fallen into the high-pressure pipe string. Since the temporary plugging balls are relatively light in weight, during the secondary ball loading operation on site, residual non-fallen temporary plugging balls are often found in the device, causing misjudgment by the fracturing commanders on the reasons for the change in bottom hole pressure, and thus affecting the implementation of subsequent fracturing transformation processes. Summary of the Utility Model
[0008] The purpose of the utility model is to overcome the problem that ball throwing needs to be carried out under pump-stopping conditions in the prior art, and provide a non-stop pump temporary plugging ball adding device and a fracturing system.
[0009] To achieve the above object, on the one hand, the present utility model provides a non-stop pump temporary plugging ball feeding device, comprising: a ball feeding unit, the ball feeding unit includes a variable thread, an upper plug valve, and a lower plug valve sequentially arranged on a riser pipe from top to bottom, and the riser pipe is connected to a fracturing high-pressure pipeline through a tee; a rotating ball cylinder unit, the rotating ball cylinder unit is connected to the variable thread; wherein, the rotating ball cylinder unit has a bottom with at least partial hollowing, so that the temporary plugging balls placed in the rotating ball cylinder unit enter the ball feeding unit through the hollowed part at the bottom of the rotating ball cylinder unit.
[0010] Preferably, the rotating ball cylinder unit includes an outer cylinder fixedly connected to the variable thread and a driving element arranged inside the outer cylinder, wherein the bottom of the rotating ball cylinder unit is a chassis with the hollowed part and a solid part, and the driving element is arranged to enable the temporary plugging balls to move from the solid part to the hollowed part.
[0011] Preferably, the driving element is an inner cylinder rotatably arranged on the chassis, and the inner cylinder includes baffles arranged inside the cylinder wall of the inner cylinder for partitioning the inner cylinder into accommodation spaces for a plurality of the temporary plugging balls.
[0012] Preferably, there are three baffles, and the baffles partition the inner cylinder into three accommodation spaces for the temporary plugging balls.
[0013] Preferably, the chassis includes the hollowed part, a first solid part, and a second solid part with equal sizes.
[0014] Preferably, it further includes a remote control system, and the remote control system can control the rotation of the inner cylinder.
[0015] Preferably, the inner cylinder rotates at an angle not exceeding 120° each time.
[0016] Preferably, it further includes a visual cover unit arranged at the top of the rotating ball cylinder unit, and the visual cover unit includes a transparent visual window and a monitoring device installed on the visual window.
[0017] Preferably, the visual window has the same size as the hollowed part at the bottom of the rotating ball cylinder unit and is arranged at a position on the visual cover unit that matches the hollowed part, so that the monitoring device on the visual window can monitor the feeding situation of the temporary plugging balls.
[0018] On the second aspect, the present utility model provides a fracturing system, and the fracturing system includes the above non-stop pump temporary plugging ball feeding device.
[0019] Through the above technical solution, when adding the temporary plugging ball, the temporary plugging ball can enter the riser through the hollow part of the rotating cylinder unit, open the upper plug valve, the temporary plugging ball falls downward into the upper part of the lower plug valve, close the upper plug valve and then open the lower plug valve, so that the temporary plugging ball falls into the high-pressure pipeline through the tee, then close the lower plug valve, and the temporary plugging ball enters the bottom of the well with the fluid in the high-pressure pipeline to achieve the purpose of plugging the perforation. In the technical solution of the present utility model, by alternately opening and closing the upper plug valve and the lower plug valve, the high-pressure fluid in the high-pressure pipeline can be prevented from surging into the dosing device, so that the temporary plugging ball can be added under the condition of not stopping the pump. Description of the Drawings
[0020] Figure 1 is a schematic structural diagram of the ball feeding unit disclosed in the embodiment of the present utility model;
[0021] Figure 2 is a schematic structural diagram of the rotating cylinder unit disclosed in the embodiment of the present utility model;
[0022] Figure 3 is Figure 2 a schematic structural diagram of the chassis of the rotating cylinder unit in
[0023] Figure 4 is a schematic structural diagram of the visual cover unit disclosed in the embodiment of the present utility model.
[0024] Description of the Reference Numerals
[0025] 1 - tee; 2 - lower plug valve; 3 - upper plug valve; 4 - reducer joint; 5 - rotating cylinder unit; 6 - visual cover unit; 7 - outer cylinder; 8 - inner cylinder; 9 - chassis; 10 - hollow part; 11 - first solid part; 12 - second solid part; 13 - visual window; 14 - monitoring device. Detailed Embodiments
[0026] In the present utility model, unless otherwise stated, the orientation words such as "upper, lower, left, right, inner, outer, top, bottom" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.
[0027] The following will describe in detail the specific embodiments of the present utility model with reference to the drawings. It should be understood that the specific embodiments described herein are only for the purpose of illustrating and explaining the present utility model, and are not used to limit the present utility model.
[0028] The utility model aims at the problem in the prior art that the temporary plugging balls need to be put in under the condition of pump shutdown, which affects the continuity of the fracturing construction, and provides a device for adding temporary plugging balls without stopping the pump and a fracturing system. Refer to Figure 1 and Figure 3 , the device for adding temporary plugging balls without stopping the pump includes: a ball feeding unit, which includes a variable sub 4, an upper plug valve 3 and a lower plug valve 2 arranged on the riser pipe from top to bottom in sequence, and the riser pipe is connected to the fracturing high-pressure pipeline through a tee 1; a rotating ball cylinder unit 5, which is connected to the variable sub 4; wherein, the rotating ball cylinder unit 5 has a bottom with at least partial hollowing, so that the temporary plugging balls placed in the rotating ball cylinder unit 5 enter the ball feeding unit through the hollow part 10 at the bottom of the rotating ball cylinder unit 5.
[0029] It should be noted that since the downstream of the device for adding temporary plugging balls is connected to the fracturing high-pressure pipeline, and the high-pressure fluid flows into the bottom of the well through the fracturing high-pressure pipeline for fracturing reconstruction operations. Usually, to avoid the high-pressure fluid in the fracturing high-pressure pipeline spraying out of the wellhead when adding temporary plugging balls, which affects the fracturing reconstruction operations, the existing ball feeding devices need to stop the pump, shut down the well and relieve the pressure before loading the temporary plugging balls again. When the utility model adds the temporary plugging balls, the temporary plugging balls can enter the riser pipe through the hollow part of the rotating ball cylinder unit. Open the upper plug valve, and the temporary plugging balls fall downward into the upper part above the lower plug valve. After closing the upper plug valve, open the lower plug valve, so that the temporary plugging balls fall into the high-pressure pipeline through the tee. Then close the lower plug valve, and the temporary plugging balls enter the bottom of the well along with the fluid in the high-pressure pipeline. By alternately opening and closing the upper plug valve and the lower plug valve, the high-pressure fluid in the high-pressure pipeline can be prevented from surging into the adding device, so that the temporary plugging balls can be added under the condition of not stopping the pump.
[0030] Preferably, refer to Figure 2 and Figure 3 , the rotating ball cylinder unit 5 includes an outer cylinder 7 fixedly connected to the variable sub 4 and a driving element arranged in the outer cylinder 7. Wherein, the bottom of the rotating ball cylinder unit 5 is a chassis 9 with a hollow part 10 and a solid part, and the driving element is arranged to move the temporary plugging balls from the solid part to the hollow part 10. The temporary plugging balls can be placed in the hollow part 10 and the solid part respectively, and the driving element is used to move the temporary plugging balls from the solid part to the hollow part 10, so that the temporary plugging balls enter the adding unit, thereby achieving the purpose of adding the temporary plugging balls multiple times.
[0031] Preferably, refer to Figure 2 , the driving element is an inner cylinder 8 rotatably arranged on the chassis 9. The inner cylinder 8 includes baffles arranged in the cylinder wall of the inner cylinder 8 to partition the inner cylinder 8 into accommodation spaces for a plurality of temporary plugging balls. Wherein, the upper and lower end faces of the inner cylinder 8 are hollowed out to facilitate the addition of the temporary plugging balls, and the accommodation spaces for the temporary plugging balls can be designed according to the actual construction requirements of the fracturing reconstruction.
[0032] Preferably, there are three baffles, which partition the inner cylinder 8 into three accommodation spaces for temporary plugging balls, thus meeting the design requirements of adding temporary plugging balls 1 - 3 times in the existing fracturing reconstruction construction.
[0033] Further, the chassis 9 is divided into corresponding multiple parts according to the number of accommodation spaces of the inner cylinder 8. Among them, the number of hollow parts is one, and the rest are solid parts. Specifically, referring to Figure 2 and Figure 3 , when the number of accommodation spaces of the inner cylinder 8 is 3, the chassis 9 includes a hollow part 10, a first solid part 11, and a second solid part 12 with equal sizes.
[0034] Preferably, the non - stop - pump temporary plugging ball adding device of the present utility model further includes a remote control system. The remote control system can control the rotation of the inner cylinder 8. By rotating the inner cylinder 8, the rotation of the baffle is driven, so as to move the temporary plugging balls placed on the first solid part 11 and the second solid part 12 to the hollow part 10 and enter the adding unit.
[0035] Further, the remote control system can also control the opening and closing of the upper plug valve 3 and the lower plug valve 2.
[0036] Preferably, the rotation angle of the inner cylinder 8 each time does not exceed 120°. It should also be noted that, referring to Figure 2 , when the number of accommodation spaces of the inner cylinder 8 is 3, the cross - section of each accommodation space is a sector with a central angle of 120°, and multiple temporary plugging balls are placed in each accommodation space. Among them, the number of temporary plugging balls in each accommodation space exceeds the number of perforations to be plugged, that is, the maximum number of temporary plugging balls added each time exceeds the number of perforations to be plugged. Therefore, the number of temporary plugging balls added can be adjusted by the size of the rotation angle of the inner cylinder 8. When all the temporary plugging balls in an accommodation space need to be added to the ball - adding unit, the remote control system controls the inner cylinder 8 to rotate 120°; when not all the temporary plugging balls in an accommodation space need to be added to the ball - adding unit, the remote control system controls the inner cylinder 8 to rotate an angle less than 120°, and the specific rotation angle can be adjusted according to the number of temporary plugging balls to be added.
[0037] Preferably, the temporary plugging balls are knotted temporary plugging balls made of degradable materials.
[0038] Preferably, referring to Figure 4, the non-stop pump temporary plugging ball feeding device of the present utility model further includes a visual cover unit 6 provided at the top of the rotating ball cylinder unit 5. The visual cover unit 6 includes a transparent visual window 13 and a monitoring device 14 installed on the visual window 13. The feeding situation of the temporary plugging balls in the rotating ball cylinder unit 5 can be monitored through the monitoring device 14, avoiding the situation in the prior art where the feeding situation of the temporary plugging balls cannot be monitored, resulting in misjudgment by the fracturing commanders on the reasons for the change of the bottom hole pressure, and further affecting the implementation of the subsequent fracturing transformation process.
[0039] Preferably, the size of the visual window 13 can cover the entire inner cylinder 8. Through the monitoring device 14, the situation of all the temporary plugging balls in the inner cylinder 8 can be observed.
[0040] Furthermore, the size of the visual window 13 is equal to the size of the hollowed-out part 10 at the bottom of the rotating ball cylinder unit 5 and is provided at a position on the visual cover unit 6 that matches the hollowed-out part 10. That is, the visual cover unit 6 is fixedly provided at the top of the rotating ball cylinder unit 5, and the projection of the visual window 13 coincides with the hollowed-out part 10, so that the monitoring device 14 on the visual window 13 can monitor the feeding situation of the temporary plugging balls, and at the same time reduce the production cost of the visual cover unit 6.
[0041] The specific operation steps of the non-stop pump temporary plugging ball feeding device of the present utility model are as follows:
[0042] Step 1: Before the fracturing construction, close the upper plug valve 3 and the lower plug valve 2 of the ball feeding device. According to the design plan, if one-time temporary plugging is planned to be implemented, place the temporary plugging balls in one accommodation space in the inner cylinder 8; if two-time temporary plugging is planned to be implemented, place the temporary plugging balls in two accommodation spaces in the inner cylinder 8 respectively; if three-time temporary plugging is planned to be implemented, place the temporary plugging balls in three accommodation spaces in the inner cylinder 8 respectively.
[0043] Step 2: After the previous stage of fracturing sand addition and displacement is completed, add 2 - 3 cubic meters of active water (or low-viscosity base fluid) to displace the high-viscosity gel in the high-pressure pipeline.
[0044] Step 3: When implementing the first temporary plugging, reduce the displacement to 2 m³ / min. First, open the upper plug valve 3 through the remote control system. After the first cluster of knotted temporary plugging balls fall, control the upper plug valve 3 to close, and control the lower plug valve 2 to open, so that the knotted temporary plugging balls enter the fracturing high-pressure pipeline.
[0045] Step 4: After closing the lower plug valve 2, gradually increase the displacement to 6 - 8 m³ / min, pump the knotted temporary plugging balls to the fracture opening, continue pumping for 2 - 3 minutes, observe the change of the pump pressure, confirm that the knotted balls have completed plugging the perforations, and then continue the fracturing construction.
[0046] Step 5: When conducting the second temporary plugging operation, reduce the displacement to 2 m³ / min. First, remotely control the inner cylinder 8 of the rotary ball cylinder to rotate clockwise by 120°. Observe the ball injection situation through the monitoring device 14. After successful ball injection, remotely control the upper plug valve 3 to open. After the second cluster of knotted temporary plugging balls fall, remotely control the upper plug valve 3 to close and the lower plug valve 2 to open, allowing the knotted temporary plugging balls to enter the fracturing high-pressure pipeline;
[0047] Step 6: Repeat Step 4;
[0048] Step 7: When conducting the third temporary plugging operation, repeat Steps 5 and 4 until the construction is completed.
[0049] The second aspect of the present utility model provides a fracturing system, which includes the above-mentioned continuous-pumping temporary plugging ball feeding device.
[0050] The preferred embodiments of the present utility model have been described in detail above in conjunction with the accompanying drawings. However, the present utility model is not limited thereto. Within the technical concept scope of the present utility model, various simple modifications can be made to the technical solutions of the present utility model, including combining each specific technical feature in any suitable manner. To avoid unnecessary repetition, the present utility model will not separately describe various possible combination methods. But these simple modifications and combinations should also be regarded as the content disclosed by the present utility model and fall within the protection scope of the present utility model.
Claims
1. A non-stop pumping temporary plugging ball feeding device, characterized in that, include: A ball-feeding unit, comprising a variable buckle (4), an upper plug valve (3), and a lower plug valve (2) arranged on a riser in order from top to bottom, wherein the riser is connected to a fracturing high-pressure pipeline via a tee (1); A rotating ball barrel unit (5), wherein the rotating ball barrel unit (5) is connected to the buckle (4); The rotating ball barrel unit (5) has a bottom that is at least partially hollowed out, so that the temporary blocking ball placed in the rotating ball barrel unit (5) enters the ball throwing unit through the hollow portion (10) at the bottom of the rotating ball barrel unit (5).
2. The non-stop pump temporary plugging ball dosing device according to claim 1, characterized in that The rotating ball cylinder unit (5) comprises an outer cylinder (7) fixedly connected to the buckle (4) and a driving element arranged in the outer cylinder (7), wherein the bottom of the rotating ball cylinder unit (5) is a chassis (9) having the hollow part (10) and a solid part, and the driving element is configured to enable the temporary blocking ball to move from the solid part to the hollow part (10).
3. The non-stop pump temporary plugging ball dosing device according to claim 2, wherein The driving element is an inner cylinder (8) rotatably arranged on the chassis (9), and the inner cylinder (8) includes a baffle arranged in the cylinder wall of the inner cylinder (8) to seal the inner cylinder (8) into a space for accommodating a plurality of the temporary blocking balls.
4. The non-stop pump temporary plugging ball dosing device according to claim 3, characterized in that, There are three baffles, which seal the inner cylinder (8) into three accommodating spaces for the temporary blocking balls.
5. The non-stop pump temporary plugging ball dosing device according to claim 4, characterized in that, The chassis (9) comprises the hollow portion (10), a first solid portion (11) and a second solid portion (12) of equal size.
6. The non-stop pump temporary plugging ball adding device according to claim 5, characterized in that, It also includes a remote control system, which can control the rotation of the inner cylinder (8).
7. The non-stop pump temporary plugging ball adding device according to claim 6, characterized in that, The inner cylinder (8) rotates at a angle of no more than 120° each time.
8. The non-stop pump temporary plugging ball dosing device according to claim 1, characterized in that, It also includes a visual cover unit (6) arranged on the top of the rotating ball cylinder unit (5), and the visual cover unit (6) includes a transparent visual window (13) and a monitoring device (14) installed on the visual window (13).
9. The non-stop pump temporary plugging ball adding device according to claim 8, characterized in that, The visual window (13) is equal in size to the hollow portion (10) at the bottom of the rotating ball barrel unit (5), and is provided at a position on the visual cover unit (6) that matches the hollow portion (10), so that the monitoring device (14) on the visual window (13) can monitor the placement of the temporary blocking ball.
10. A fracturing system, characterized in that, The fracturing system includes the non-stop pumping temporary plugging ball dosing device according to any one of claims 1 to 9.