Ground sand prevention device for ultra-deep gas well

What is AI technical title?
AI technical title is built by Patsnap AI team. It summarizes the technical point description of the patent document.
By designing a ground sand prevention device for ultra-deep gas wells, the problems of high cost, high operational difficulty and high well repair risk in the existing technology, the sand prevention and sand cleaning operation is solved, and efficient sand prevention and sand cleaning operations are achieved on the ground, reducing the problem of high cost and high operation of the existing super-deep gas wells. The operation difficulty and cost are used, the equipment service life and production time are extended, and the continuous production and economic benefits of ultra-deep gas wells are guaranteed.

CN222457407UActive Publication Date: 2025-02-11CHINA PETROLEUM & CHEMICAL CORP +1

View PDF 0 Cites 0 Cited by

Patent Information

Application Number: CN202421152604.3
Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner
Filing Date: 2024-05-24
Publication Date: 2025-02-11
Estimated Expiration: 2034-05-24

AI Technical Summary

Technical Problem

The existing sand prevention process for ultra-deep gas wells has problems such as high cost, high operation difficulty, long production cycle and high risk of well repair. Especially when the grain size of the sand gravel at the Cretaceous and other layers is fine, it is difficult to prevent sand from underground, resulting in production interruption and Additional fees are increased.

Method used

Design a ground sand prevention device, including an outer cylinder, liquid inlet pipe, concentrically arranged sand filter pipe and support frame, which can achieve sand prevention and regular sand cleaning operations on the ground, with high sand barrier accuracy, and achieve 200μm barrier according to different gravel grain sizes in the formation. Sand precision.

Benefits of technology

It realizes efficient sand prevention and sand cleaning operations on the ground, reduces operational difficulty and cost, extends equipment service life and production time, avoids high risks brought by well repair operations, and ensures the continuous production and economic benefits of ultra-deep gas wells. .

✦ Generated by Eureka AI based on patent content.

Smart Images

Figure CN222457407U_ABST

Patent Text Reader

Abstract

The utility model provides a ground sand prevention device for an ultra-deep gas well, which comprises an outer cylinder arranged on the ground, a liquid inlet pipe arranged at the top end of the outer cylinder and used for receiving formation fluid, and a sand filtering pipe concentrically arranged in the outer cylinder, a supporting frame allowing the formation fluid to pass through is arranged between the sand filtering pipe and the outer cylinder. According to the sand blocking device, sand prevention and regular sand cleaning operation can be achieved on the ground, and due to the fact that the sand blocking precision of the sand blocking device is high, it is guaranteed that oil entering the sand filtering pipe can meet the sufficient oil extraction requirement.

Need to check novelty before this filing date? Find Prior Art

Description

Technical Field

[0001] The utility model relates to the field of ultra-deep gas well sand prevention technology, in particular to a ground sand prevention device used for ultra-deep gas wells. Background Art

[0002] The existing ultra-deep gas well sand control technologies in oil fields mainly include reservoir sand control and pump-under sand control. Among them, reservoir sand control is to use gravel filling to prevent sand, using 0.6-1.2mm ceramsite gravel and 0.30mm precision sand filter tubes, but this sand control technology is expensive and difficult; while pump-under sand control is to suspend fine sand filter tubes under the pump. During the production process, the fine sand produced by the formation is filtered by the fine sand filter tubes, thereby extending the service life of the pump, but the fine sand filter tubes under the pump are expensive per well and have a long production cycle.

[0003] Moreover, both of these technologies are underground sand control. Sand and gravel may accumulate in the high-angle section of the gas well, thereby blocking the gas flow channel. Well repair operations are required to cooperate with the implementation of sand control technology. However, during production after sand burial, the pressure difference or the exciting pressure caused by opening and closing the well will accelerate sand production, which requires repeated repairs, delaying production and generating a lot of additional costs and construction time.

[0004] At present, according to statistics, the cost of gravel packing service tubing in oil fields is 350,000 to 400,000 yuan, and the cost of ordinary sand filter pipes per well is 60,000 yuan. Ultra-deep gas wells are classified as Class I risk wells, with high well repair costs and operational risks. In addition, the grain size of gravel in the Cretaceous and other strata in ultra-deep gas wells is generally fine, making it difficult to prevent sand underground.

[0005] Therefore, it is desirable in the art to provide a surface sand control device for ultra-deep gas wells for use at ultra-deep gas well sites, thereby avoiding waste of manpower, material and financial resources while ensuring continuous production of the ultra-deep gas wells. Utility Model Content

[0006] The purpose of the utility model is to propose a ground sand prevention device for ultra-deep gas wells, which can realize sand prevention and regular sand cleaning operations on the ground, and the sand prevention accuracy of the device is high. It can achieve a sand prevention accuracy of 200μm according to different gravel particle sizes in the formation, thereby ensuring that the oil entering the sand filter pipe can meet the oil production requirements.

[0007] According to the utility model, a ground sand control device for ultra-deep gas wells is provided, comprising an outer cylinder arranged on the ground,

[0008] a liquid inlet pipe disposed at the top of the outer cylinder and used to receive formation fluid from an ultra-deep gas well, and

[0009] A sand filter tube is concentrically arranged in the outer cylinder,

[0010] Wherein, a support frame allowing the formation fluid to pass through is provided between the sand filter tube and the outer cylinder.

[0011] In one embodiment, the support frame includes a first annular structure that forms a sealing connection with the outer circumferential surface of the sand filter tube, and a second annular structure that forms a sealing connection with the inner circumferential surface of the outer cylinder, wherein the diameter of the first annular structure is smaller than the diameter of the second annular structure.

[0012] In one embodiment, a plurality of ribs arranged at intervals are provided between the first annular structure and the second annular structure.

[0013] In one embodiment, a blind plug is provided at the top of the sand filter tube.

[0014] In one embodiment, filtering holes are provided on the outer wall of the sand filter tube, and the filtering holes are configured as any one of circular holes and strip holes.

[0015] In one embodiment, a liquid outlet pipe for discharging the liquid is provided at the bottom end of the outer cylinder.

[0016] The ground sand control device further comprises a first flange and a second flange which are arranged at both ends of the outer cylinder and are configured into an annular structure, wherein the liquid inlet pipe is arranged on the first flange, and the liquid outlet pipe is arranged on the second flange.

[0017] In one embodiment, a filter screen is laid at the junction of the sand filter pipe and the second flange.

[0018] In one embodiment, a clamp head is provided on the outer wall surface of the outer cylinder, and the ground sand control device further comprises a sand cleaning pipe radially arranged on the clamp head.

[0019] In one embodiment, the liquid inlet pipe is connected to the wellhead of the gas well.

[0020] In one embodiment, a pressure gauge is provided on the liquid inlet pipe.

[0021] Compared with the prior art, the advantages of the utility model are:

[0022] Firstly, the utility model can realize sand prevention and regular sand cleaning operations on the ground, and the sand blocking accuracy of the device is high. It can achieve a sand blocking accuracy of 200μm according to the different gravel particle sizes of the strata, thereby ensuring that the oil entering the sand filter tube can meet the oil production requirements.

[0023] Secondly, the utility model has low operating difficulty, low sand control cost, and long service life and production time, thereby effectively avoiding the high risks brought about by ultra-deep gas well repair operations, thereby ensuring the long-term economic benefits of ultra-deep gas well production and development. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be described in detail below in conjunction with the accompanying drawings, in which:

[0025] Figure 1 The structure of the surface sand control device for ultra-deep gas wells according to the utility model is schematically shown;

[0026] Figure 2 for Figure 1 Cross-sectional view at AA in the middle;

[0027] Figure 3 for Figure 1 Cross-sectional view at BB in the middle.

[0028] In the drawings, the same reference numerals are used for the same components. The drawings are not drawn to scale. DETAILED DESCRIPTION

[0029] In order to make the technical solutions and advantages of the present invention more clearly understood, the exemplary embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than an exhaustive list of all embodiments. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other if there is no conflict.

[0030] The utility model will be further described below in conjunction with the accompanying drawings.

[0031] like Figure 1 As shown, according to the utility model, the ground sand control device 100 for ultra-deep gas wells comprises an outer cylinder 11 arranged on the ground, a liquid inlet pipe 12 arranged at the top of the outer cylinder 11, and a sand filter tube 20 concentrically arranged in the outer cylinder 11. Preferably, the liquid inlet pipe 12 can be connected to the wellhead of the ultra-deep gas well, so as to smoothly receive the formation fluid, and the formation fluid can be effectively filtered under the action of the sand filter tube 20, so as to improve the oil production quality of the ground sand control device 100 for ultra-deep gas wells.

[0032] In the present invention, ultra-deep gas wells generally refer to gas wells with a depth of 5000-6000m.

[0033] In one embodiment, Figure 1 As shown, a support frame 21 is provided between the sand filter tube 20 and the outer tube 11. Preferably, the support frame 21 is in the annulus between the sand filter tube 20 and the outer tube 11, which can not only enable the outer tube 11 to always be in a centered state to ensure that the formation fluid can smoothly pass through the sand filter tube 20, but also provide a good support effect for the sand filter tube 20 to ensure the stability of the sand filter tube 20 when working on the ground.

[0034] According to the utility model, if Figure 1 and2 As shown, the support frame 21 includes a first annular structure 211 with a smaller diameter and a second annular structure 212 with a larger diameter. Preferably, the inner circumferential surface of the first annular structure 211 can form a sealed connection with the outer circumferential surface of the sand filter tube 20; the outer circumferential surface of the second annular structure 212 can form a sealed connection with the inner circumferential surface of the outer cylinder 11. In this way, the firmness between the sand filter tube 20, the support frame 21 and the outer cylinder 11 is effectively strengthened.

[0035] In one embodiment, Figure 2 As shown, a plurality of ribs 213 are provided between the first annular structure 211 and the second annular structure 212. Preferably, the plurality of ribs 213 are arranged at intervals, so that under the action of the ribs 213, the support frame 21 can not only allow the formation fluid to pass through, but also provide good support for the sand filter 20, so as to further ensure the stability and firmness of the ground sand control device 100 for ultra-deep gas wells working on the ground.

[0036] According to the utility model, if Figure 1 As shown, the ground sand control device 100 for ultra-deep gas wells includes a blind plug 22 disposed at the top of the sand filter tube 20, and a filter hole 23 disposed on the outer wall of the filter tube 20. Preferably, the blind plug 22 can seal the top of the sand filter tube 20 to ensure that all formation fluids can flow to the sand filter tube 20 through the support frame 21. Preferably, the filter hole 23 can fully block the gravel in the formation fluid to ensure that the oil entering the sand filter tube 20 can meet the oil production requirements.

[0037] In one embodiment, the size of the filter holes 23 is 0.1-0.2 mm. As a result, the sand and gravel in the formation fluid will be blocked outside the sand filter tube 20 by the filter holes 23, thereby achieving the purpose of external filter and sand prevention. In addition, since the distances between adjacent filter holes 23 are equal, the formation fluid can be fully and evenly filtered. Preferably,

[0038] Preferably, the device can achieve a filtration accuracy of 200 μm according to different gravel particle sizes in the formation, thereby ensuring that the oil entering the sand filter tube 20 can meet the oil production requirements.

[0039] In one embodiment, the filter holes 23 include any one of circular holes and strip holes. In this way, the filter holes 23 can be more easily distributed on the outer wall of the sand filter tube 20 to improve the filtering performance of the ground sand control device 100 for ultra-deep gas wells on formation fluids. In the present utility model, the filter holes 23 are preferably strip holes. It is easy to understand that the strip holes have higher sand control accuracy than the circular holes, so as to further improve the filtering performance.

[0040] In another embodiment, the filter hole 23 may also be configured as other structures.

[0041] In one embodiment, Figure 1 As shown, a liquid outlet pipe 13 is provided at the bottom end of the outer cylinder 11. Preferably, the liquid outlet pipe 13 is connected to a ground manifold (not shown in the drawings) to receive the filtered oil.

[0042] According to the utility model, if Figure 1 As shown, the surface sand control device 100 for ultra-deep gas wells further includes a first flange 14 and a second flange 15 which are arranged at both ends of the outer cylinder 11 and form a sealed connection. Preferably, the first flange 14 and the second flange 15 are both configured as an annular structure. Accordingly, the first flange 14 and the second flange 15 are both configured as high-pressure flanges.

[0043] In the present invention, the liquid inlet pipe 12 is vertically arranged on the first flange 14, and the liquid outlet pipe 13 is vertically arranged on the second flange 15. Therefore, the formation fluid can pass through the sand filter tube 20 through the liquid inlet pipe 12, the first flange 14 and the support frame 21 in sequence, and the fluid filtered by the sand filter tube 20 can be smoothly discharged through the second flange 15 and the liquid outlet pipe 13 in sequence.

[0044] In a preferred embodiment, the first flange 14 is detachably connected to the outer tube 11 so that the sand filter tube 20 can be taken out and cleaned to ensure that the ground sand control device 100 for ultra-deep gas wells has good sand filtering ability during operation.

[0045] In one embodiment, Figure 3 As shown, a filter screen 24 is laid at the joint between the sand filter pipe 20 and the second flange 15, thereby effectively improving the sand blocking accuracy of the ground sand control device 100 used in ultra-deep gas wells.

[0046] In one embodiment, Figure 1 As shown, a clamp head 16 is provided on the outer wall surface of the outer cylinder 11. In addition, the surface sand control device 100 for ultra-deep gas wells further comprises a sand cleaning pipe 17 radially arranged on the clamp head 16. Preferably, the sand and gravel blocked outside the sand filter pipe 20 by the filter hole 23 will be smoothly discharged through the sand cleaning pipe 17 to ensure the sand filtering environment in the surface sand control device 100 for ultra-deep gas wells.

[0047] In one embodiment, Figure 1 As shown, a pressure gauge 18 is provided on the liquid inlet pipe 12. Preferably, the pressure gauge 18 can be used to observe the front and rear process pressures of the surface sand control device 100 for ultra-deep gas wells during production at any time to improve the safety of the surface sand control device 100 for ultra-deep gas wells.

[0048] Compared with the prior art, the advantages of the present invention are:

[0049] Firstly, the utility model can realize sand prevention and regular sand cleaning operations on the ground, and the sand blocking accuracy of the device is high. It can achieve a sand blocking accuracy of 200μm according to the different gravel particle sizes of the strata, thereby ensuring that the oil entering the sand filter tube can meet the oil production requirements.

[0050] Secondly, the utility model has low operating difficulty, low sand control cost, and long service life and production time, thereby effectively avoiding the high risks brought about by ultra-deep gas well repair operations, thereby ensuring the long-term economic benefits of ultra-deep gas well production and development.

[0051] In the description of the present utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0052] In the present utility model, unless otherwise clearly stipulated and limited, the terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal connection of two elements.

[0053] For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0054] The above are only preferred embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art can easily make changes or modifications within the scope of the present invention, and such changes or modifications should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A surface sand control device for ultra-deep gas wells, characterized in that: include: An outer cylinder (11) arranged on the ground, a liquid inlet pipe (12) disposed at the top end of the outer cylinder (11) and used to receive formation fluid from an ultra-deep gas well, and a sand filter tube (20) arranged concentrically in the outer cylinder (11), Wherein, a support frame (21) for allowing the formation fluid to pass through is provided between the sand filter tube (20) and the outer cylinder (11).

2. The surface sand control device for ultra-deep gas wells according to claim 1, characterized in that: The support frame (21) comprises a first annular structure (211) which is sealedly connected to the outer peripheral surface of the sand filter tube (20), and a second annular structure (212) which is sealedly connected to the inner peripheral surface of the outer cylinder (11), wherein the diameter of the first annular structure (211) is smaller than the diameter of the second annular structure (212).

3. The surface sand control device for ultra-deep gas wells according to claim 2, characterized in that: A plurality of ribs (213) arranged at intervals are provided between the first annular structure (211) and the second annular structure (212).

4. The surface sand control device for ultra-deep gas wells according to claim 3, characterized in that: A blind plug (22) is provided at the top of the sand filter tube (20).

5. The surface sand control device for ultra-deep gas wells according to claim 4, characterized in that: A filtering hole (23) is provided on the outer wall of the sand filter tube (20), and the filtering hole (23) is configured as any one of a circular hole and a strip-shaped hole.

6. The surface sand control device for ultra-deep gas wells according to claim 5, characterized in that: A liquid outlet pipe (13) for discharging liquid is provided at the bottom end of the outer cylinder (11). The ground sand control device also includes a first flange (14) and a second flange (15) which are arranged at both ends of the outer cylinder (11) and are configured into an annular structure, wherein the liquid inlet pipe (12) is arranged on the first flange (14) and the liquid outlet pipe (13) is arranged on the second flange (15).

7. The surface sand control device for ultra-deep gas wells according to claim 6, characterized in that: A filter screen (24) is laid at the junction of the sand filter pipe (20) and the second flange (15).

8. The surface sand control device for ultra-deep gas wells according to any one of claims 1 to 7, characterized in that: A clamp head (16) is provided on the outer wall surface of the outer cylinder (11), and the ground sand control device further comprises a sand cleaning pipe (17) radially arranged on the clamp head (16).

9. The surface sand control device for ultra-deep gas wells according to any one of claims 1 to 7, characterized in that: The liquid inlet pipe (12) is connected to the wellhead of the gas well.

10. The surface sand control device for ultra-deep gas wells according to any one of claims 1 to 7, characterized in that: A pressure gauge (18) is provided on the liquid inlet pipe (12).