Process pipe column for supporting well wall through expansion screen pipe and construction method

Abstract

The invention belongs to the field of petroleum and natural gas accident treatment, and particularly relates to a process pipe column for supporting a well wall through an expansion screen pipe and a construction method. The process pipe column for supporting the well wall through the expansion screen pipe comprises an expansion hanging structure and an expansion supporting structure, and the expansion hanging structure is connected with the expansion supporting structure; and after the expansion supporting pipe column descends into a well, the expansion hanging structure is fixed in a casing pipe after being expanded, and the expansion supporting structure is expanded to support the well wall. According to the expansion supporting pipe column, the open hole well wall prone to collapse in the drilling process is supported, the requirement for the stability of the well wall is met, and smooth drilling of complex well sections prone to collapse is ensured; the method has the advantages of short construction time and cost reduction.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of oil and gas accident treatment, in particular to an expanded screen pipe supporting well wall process pipe column and construction method. BACKGROUND

[0002] At present, the number of complex wells and deep wells in oil and gas well drilling gradually increases, and the risk of collapse of complex downhole accidents in the process of drilling increases. The current solution is mainly to use the method of running casing to isolate complex layers and prevent collapse; but the method of running casing needs to inject isolation fluid, flush fluid and cement, which leads to complicated construction process, long construction time and increased cost; and with the increase of well depth, the diameter of the running casing gradually decreases, which is not conducive to drilling.

[0003] Therefore, the present application is proposed. SUMMARY

[0004] In order to solve the technical problems existing in the prior art, the present application provides an expanded screen pipe supporting well wall process pipe column. The expanded supporting pipe column supports the easy-to-collapse open hole wall in the drilling process, meets the demand of maintaining the stability of the well wall, and ensures the smooth drilling of the easy-to-collapse complex well section. It has the advantages of short construction time and low cost.

[0005] The present application comprises the following technical solutions:

[0006] The present application provides an expanded screen pipe supporting well wall process pipe column in the first aspect, comprising an expansion suspension structure and an expansion support structure, the expansion suspension structure is connected with the expansion support structure; after the expansion support pipe column is lowered into the well, the expansion suspension structure is fixed in the casing after expansion, and the expansion support structure supports the well wall after expansion.

[0007] Further, the expansion suspension structure comprises an expansion cone, an expansion pipe and a plurality of sealing tubes, the sealing tubes are sleeved outside the expansion pipe, the expansion cone is arranged in the expansion pipe, and in use, the expansion cone is driven to move towards the inlet to expand the expansion pipe.

[0008] Further, the expansion pipe comprises a first connecting section, an expansion section and a second connecting section, the expansion section is connected between the first connecting section and the second connecting section; before the expansion suspension structure expands, the outer diameter of the expansion section < the outer diameter of the first connecting section, and the outer diameter of the expansion section < the outer diameter of the second connecting section; after the expansion suspension structure expands, the outer diameter of the expansion section > the outer diameter of the first connecting section, and the outer diameter of the expansion section > the outer diameter of the second connecting section; the sealing tubes are sleeved outside the expansion section.

[0009] Further, a pressure bearing plate is arranged below the expansion cone before the expansion of the expansion hanger structure, the pressure bearing plate is fixedly connected in the expansion hanger structure, and the pressure bearing plate and the expansion cone form a water injection cavity; the expansion cone is connected with a central pipe, the expansion cone is provided with a water injection channel communicated with the central pipe, and the water injection channel is also communicated with the water injection cavity.

[0010] Further, the expansion support structure comprises an expansion screen pipe, and the expansion screen pipe is provided with slits.

[0011] Further, the slits are uniformly arranged.

[0012] Further, after the expansion of the expansion hanger structure and the expansion support structure, the inner diameter of the expansion screen pipe = the inner diameter of the first connecting section = the inner diameter of the expansion section = the inner diameter of the second connecting section.

[0013] Further, a guide shoe is further included, and the guide shoe is connected to the end of the expansion support structure away from the wellhead.

[0014] The second aspect of the present application provides a construction method of the expansion screen pipe supporting well wall process pipe column, comprising the above-mentioned expansion screen pipe supporting well wall process pipe column, and the construction method comprises the following steps:

[0015] Lowering the expansion support pipe column into a predetermined position in the well;

[0016] Expanding the expansion hanger structure to be fixed in the well pipe;

[0017] Expanding the expansion support structure to be close to the well wall.

[0018] Further, the expansion of the expansion hanger structure to be fixed in the well pipe comprises the following steps:

[0019] Pressurizing the water injection cavity in the expansion hanger structure through the central pipe to drive the expansion cone to move upward so that the expansion section of the expansion hanger structure is expanded and fixed on the well pipe;

[0020] Continuing to pressurize until the expansion cone is separated from the expansion hanger structure, and then the central pipe and the expansion cone are lifted out;

[0021] The expansion of the expansion support structure to be close to the well wall comprises the following steps:

[0022] Lowering the expansion tool into the expansion support pipe column, and breaking the pressure bearing plate by applying pressure through the conical head of the expansion tool;

[0023] Continuing to lower the expansion tool so that the expansion screen pipe is expanded and closely attached to the well wall to form support to the well wall.

[0024] By adopting the above technical solution, the present application has the following advantages:

[0025] 1. The inflatable support pipe column of the present application supports the easy collapse of the open hole wall during the drilling process, meets the requirement of maintaining the stability of the well wall, and ensures the smooth drilling of the easy collapse complex well section; has the advantages of short construction time and reduced cost.

[0026] 2. The inflatable support pipe column of the present application has a small diameter before expansion, a large expansion rate, can be lowered into the well with a small diameter, and is expanded to form a large diameter, which is beneficial to the smooth lowering of the pipe column in the irregular open hole.

[0027] 3. The present application uses an expansion tool to perform expansion screen pipe expansion operation, avoiding the risk of high pressure operation.

[0028] 4. The inflatable support pipe column of the present application supports the open hole wall after expansion, can maintain the stability of the well wall, and block the falling block.

[0029] 5. The slotted screen of the present application not only improves the expansion efficiency, but also makes the internal and external pressures of the expansion screen pipe consistent due to the setting of the slotted screen, avoiding the damage of the expansion screen pipe caused by the pressure difference between the inside and outside of the pipe.

[0030] 6. The inflatable support pipe column and the construction method of the present application have the advantages of reducing the operation risk, operation cycle and construction cost.

[0031] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the present application. The objects and other advantages of the present application can be achieved and obtained by the structures indicated in the specification and the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0033] Figure 1 It is a structure schematic diagram of an expansion screen pipe support well wall process pipe column in an embodiment of the present application;

[0034] Figure 2 It is a structure schematic diagram of an expansion screen pipe support well wall process pipe column in an embodiment of the present application;

[0035] Figure 3 It is a structure schematic diagram of an expansion screen pipe support well wall process pipe column in an embodiment of the present application;

[0036] Figure 4A structural schematic diagram of an expanded support structure of an expansion screen pipe supporting well wall process pipe column in an embodiment of the present application after expansion;

[0037] Figure 5 A structural schematic diagram of the expansion screen pipe supporting well wall process pipe column in an embodiment of the present application after the drill shoe is drilled out;

[0038] In the figure: 10 - expansion suspension structure, 11 - expansion cone, 12 - expansion pipe, 121 - first connecting section, 122 - expansion section, 123 - second connecting section, 13 - sealing cylinder, 20 - expansion support structure, 21 - slotted hole, 30 - pressure bearing plate, 40 - water injection cavity, 50 - central pipe, 60 - drill shoe, 70 - expansion tool, 71 - conical head. DETAILED DESCRIPTION

[0039] The following description provides many different embodiments, or examples, for implementing different features of the application. Elements in the figures are illustrated for simplicity and clarity and have not necessarily been drawn to scale. For example, the dimensions of some of the elements in the figures can be exaggerated relative to other elements to help to improve understanding of various embodiments of the present application. Also, common, well-understood elements that are useful in a substantially similar manner to components already known are not necessarily described in great detail in this disclosure.

[0040] To make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will be combined with the drawings of the embodiments of the present application to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some embodiments but not all of the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the scope of the present application.

[0041] The present embodiment provides an expansion screen pipe supporting well wall process pipe column, as shown in the figure, comprising an expansion suspension structure 10 and an expansion support structure 20, the expansion suspension structure 10 is connected with the expansion support structure 20; after the expansion support pipe column is lowered into the well, the expansion suspension structure 10 is fixed in the casing after expansion, and the expansion support structure 20 supports the well wall after expansion. Figure 1

[0042] Among them, the expansion suspension structure 10 and the expansion support structure 20 are structures with expansion function, the expansion suspension structure 10 is fixed by cooperating with the inner wall of the casing after expansion by its expansion function, and the expansion support structure 20 supports the well wall after expansion to prevent the collapse of the collapsed layer of the well wall and ensure safe drilling.

[0043] The casing is a tool used for cementing in the drilling process; in the drilling process, the casing is usually lowered into the well for cementing while drilling, but the use of the casing needs to inject isolation fluid, flush fluid and cement, etc., resulting in complicated construction procedures and increased cost; therefore, by using the expansion support pipe column of the present application, the use of the casing can be reduced, the construction procedure is reduced, and the cost is reduced.​

[0044] It should be noted that the structure of the present application needs to be used with a casing during use, and is not not used with a casing, the inflatable support pipe column of the present application can reduce the use of the casing; to achieve the advantages of reducing construction process and reducing cost.

[0045] It should be noted that the inflatable suspension structure 10 and the inflatable support structure 20 provided in the embodiment are preferred modes, and other inflatable suspension structures 10 and inflatable support structures 20 that can achieve inflatable suspension should also be within the protection scope of the present application. The inflatable suspension structure 10 and the inflatable support structure 20 provided in the embodiment jointly act to ensure drilling of a deeper well.

[0046] In some embodiments, as shown in Figure 1 The inflatable suspension structure 10 includes an inflatable cone 11, an inflatable pipe 12, and a plurality of sealing cylinders 13, the sealing cylinders 13 are sleeved outside the inflatable pipe 12, the inflatable cone 11 is arranged in the inflatable pipe 12, and the inflatable pipe 12 is expanded by driving the inflatable cone 11 to move towards the wellhead.

[0047] The sealing cylinder 13 is a ring structure, which can be regarded as a ring of protrusions arranged outside the inflatable pipe 12, the number of the sealing cylinder 13 is not limited by the present application, and one or more should be within the protection scope of the present application; the sealing cylinder 13 can improve the fixing effect of the inflatable suspension structure 10 and improve its stability.

[0048] As shown in Figure 1 The inflatable cone 11 moves upwards to expand the inflatable pipe 12 and cooperate with the inner wall of the casing to fix the inflatable pipe 12.

[0049] To make the inflatable cone 11 move upwards, in some embodiments, as shown in Figure 1 Before the inflatable suspension structure 10 is expanded, a pressure bearing plate 30 is arranged below the inflatable cone 11, the pressure bearing plate 30 is fixedly connected in the inflatable suspension structure 10, and a water injection cavity 40 is formed between the pressure bearing plate 30 and the inflatable cone 11; the inflatable cone 11 is connected with a central pipe 50, the inflatable cone 11 is provided with a water injection channel that communicates with the central pipe 50, and the water injection channel also communicates with the water injection cavity 40. This structure can drive the inflatable cone 11 to move upwards by pressurized water injection into the water injection cavity 40, and such a way of moving the inflatable cone 11 upwards has the advantages of labor saving and high efficiency.

[0050] It should be noted that the way of moving the inflatable cone 11 upwards is not limited to the pressurized water injection, and in the case that the pressure bearing plate 30 is not arranged and the water injection cavity 40 is not formed, the inflatable cone 11 can be moved upwards by pulling the central pipe 50 upwards.

[0051] In some embodiments, as shown in Figure 1 The expansion pipe 12 comprises a first connecting section 121, an expansion section 122 and a second connecting section 123, and the expansion section 122 is connected between the first connecting section 121 and the second connecting section 123; as shown in Figure 1 Before the expansion of the expansion hanging structure 10, the outer diameter of the expansion section 122 < the outer diameter of the first connecting section 121, and the outer diameter of the expansion section 122 < the outer diameter of the second connecting section 123; after the expansion of the expansion hanging structure 10, the outer diameter of the expansion section 122 > the outer diameter of the first connecting section 121, and the outer diameter of the expansion section 122 > the outer diameter of the second connecting section 123; the sealing cylinder 13 is sleeved outside the expansion section 122. Such a structure can ensure that the expansion hanging structure 10 has good fixing effect and also has a larger inner diameter to ensure the running of the drilling tool.

[0052] As shown in Figure 2 After the expansion of the expansion hanging structure 10, the outer diameter of the expansion section 122 = the inner diameter of the first connecting section 121, and the outer diameter of the expansion section 122 = the outer diameter of the second connecting section 123, which should also be within the protection scope of the present application.

[0053] In some embodiments, as shown in Figure 1 The expansion support structure 20 comprises an expansion screen pipe, and the expansion screen pipe is connected to the second connecting section 123, and the expansion screen pipe is provided with a slit 21. The slit 21 can not only improve the expansion efficiency, but also ensure that the internal and external pressures of the expansion screen pipe are consistent.

[0054] It should be noted that the expansion support structure 20 is expanded by the expansion tool 70, and the expansion tool 70 can be an expansion tool 70 in the prior art. However, based on the structure of the pressure-bearing plate 30, since the pressure-bearing plate 30 needs to be broken, the expansion tool 70 needs to be provided with a conical head 71.

[0055] In some embodiments, as shown in Figure 4 The slits 21 are uniformly arranged, which can ensure that the expansion screen pipe is uniformly stressed and expanded, and has better support and protection effect.

[0056] The expansion screen pipe is a whole structure, and the inner diameter of the expansion screen pipe is consistent after expansion. The expansion pipe 12 includes a first connecting section 121, an expansion section 122 and a second connecting section 123, and the inner diameters of the first connecting section 121, the expansion section 122 and the second connecting section 123 are not necessarily equal after expansion. Therefore, in some embodiments, the inner diameter of the expansion screen pipe after expansion = the inner diameter of the first connecting section 121 after expansion = the inner diameter of the expansion section 122 after expansion = the inner diameter of the second connecting section 123 after expansion. In this way, the inner diameters of the expansion pipe 12 and the expansion screen pipe after expansion are large enough, so that the drilling tool has a larger running space, and the drilling efficiency is improved. Meanwhile, the expansion support pipe string of the present application can ensure the drilling of a deeper well.

[0057] It should be noted that, as shown in Figure 4 the inner diameter of the expansion screen pipe after expansion = the inner diameter of the expansion pipe 12 after expansion should also be within the protection scope of the present application.

[0058] In some embodiments, as shown in Figure 1 the expansion screen pipe after expansion = the inner diameter of the first connecting section 121 after expansion = the inner diameter of the expansion section 122 after expansion = the inner diameter of the second connecting section 123 after expansion. In this way, the inner diameters of the expansion pipe 12 and the expansion screen pipe after expansion are large enough, so that the drilling tool has a larger running space, and the drilling efficiency is improved. Meanwhile, the expansion support pipe string of the present application can ensure the drilling of a deeper well.

[0059] The present embodiment also provides a construction method of the expansion screen pipe supporting the well wall process pipe string, which includes the above-mentioned expansion screen pipe supporting the well wall process pipe string. The construction method includes the following steps:

[0060] lowering the expansion support pipe string into the well to a predetermined position;

[0061] expanding the expansion suspension structure 10 and fixing it in the well pipe;

[0062] expanding the expansion support structure 20 and tightly abutting the well wall.

[0063] The expansion support pipe string of the present application adopts a top-down expansion mode. If resistance is encountered during the expansion process, the expansion support pipe string can be pulled out, a drill bit is lowered to continue drilling, and the expansion support pipe string is completely expanded.

[0064] In some embodiments, expanding the expansion suspension structure 10 and fixing it in the well pipe include the following steps:

[0065] As shown in Figure 1 the expansion section 122 of the expansion suspension structure 10 is expanded and fixed on the well pipe by pressurizing the water injection cavity 40 in the expansion suspension structure 10 through the central pipe 50 to drive the expansion cone 11 to move upward.

[0066] As shown in Figure 2The pressure is continuously applied until the expansion cone 11 is detached from the expansion hanger structure 10, and the central pipe 50 and the expansion cone 11 are pulled out.

[0067] The expansion of the expansion support structure 20 against the well wall comprises the following steps:

[0068] The expansion tool 70 is lowered into the expansion support pipe string, and the pressure is applied by the conical head 71 of the expansion tool 70 to break the pressure-bearing plate 30.

[0069] It should be noted that the pressure-bearing plate 30 is not broken during the water injection and pressure application because the pressure is applied to the surface, but the pressure is applied by the expansion tool 70 as point pressure, which can break the pressure-bearing plate 30.

[0070] As shown in Figure 3 The expansion tool 70 is continuously lowered to expand the expansion screen pipe to tightly contact the well wall and form support to the well wall. It should be noted that the outer diameter of the expansion tool 70 should be able to ensure the expansion of the expansion screen pipe, and the specific shape of the outer diameter is not limited in the present application, as long as the shape can achieve expansion, which should be within the protection scope of the present application. Preferably, the expansion tool 70 comprises a conical head 71, an expansion part and a hand-held part connected in sequence. As shown in Figure 4 The expansion tool 70 is pulled out, as shown in Figure 5 The guide shoe 60 is knocked off. It should be noted that the specific structure and shape of the guide shoe 60 are not limited in the present application. Preferably, one end of the guide shoe 60 is connected to the expansion screen pipe, and the other end is tapered, which has a better guiding effect.

[0071] The present embodiment also provides a drilling method comprising the construction method of the expansion support pipe string described above, and the drilling method comprises the following steps: lowering a drilling tool into the casing, taking out the drilling tool after the drilling tool is drilled; lowering the expansion support pipe string into the well at a predetermined position;

[0072] Expanding the expansion hanger structure 10 to be fixed in the well pipe; expanding the expansion support structure 20 to tightly contact the well wall; after the construction of the expansion support pipe string is completed, a drilling tool is lowered into the expansion support pipe string after being fixed and supported, and the drilling machine continues to drill.

[0073] By using the expansion support pipe string of the present application, not only can the open hole well wall be supported to avoid collapse, but also the drilling tool can be lowered to continue drilling.

[0074] Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions described in the foregoing embodiments can be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A process string for supporting wellbore with an expandable screen pipe, characterized in that, It includes an expandable suspension structure (10) and an expandable support structure (20), wherein the expandable suspension structure (10) is connected to the expandable support structure (20); after the expandable support tubing is run into the well, the expandable suspension structure (10) expands and is fixed inside the casing, and the expandable support structure (20) expands and supports the well wall.

2. The expansion screen pipe support wellbore process tubing string according to claim 1, characterized in that, The expansion suspension structure (10) includes an expansion cone (11), an expansion tube (12), and several sealing cylinders (13). The sealing cylinders (13) are sleeved outside the expansion tube (12), and the expansion cone (11) is disposed inside the expansion tube (12). In use, the expansion cone (11) is driven to move towards the inlet to expand the expansion tube (12).

3. The expansion screen pipe support wellbore process tubing according to claim 2, characterized in that, The expansion tube (12) includes a first connecting section (121), an expansion section (122), and a second connecting section (123). The expansion section (122) is connected between the first connecting section (121) and the second connecting section (123). Before the expansion suspension structure (10) expands, the outer diameter of the expansion section (122) is less than the outer diameter of the first connecting section (121), and the outer diameter of the expansion section (122) is less than the outer diameter of the second connecting section (123). After the expansion suspension structure (10) expands, the outer diameter of the expansion section (122) is greater than the outer diameter of the first connecting section (121), and the outer diameter of the expansion section (122) is greater than the outer diameter of the second connecting section (123). The sealing cylinder (13) is sleeved on the expansion section (122).

4. A wellbore support tubing string for expansion screen pipes according to claim 2 or 3, characterized in that, Before the expansion suspension structure (10) expands, a pressure plate (30) is provided below the expansion cone (11). The pressure plate (30) is fixedly connected inside the expansion suspension structure (10). A water injection cavity (40) is formed between the pressure plate (30) and the expansion cone (11). The expansion cone (11) is connected to a central pipe (50). The expansion cone (11) is provided with a water injection channel that communicates with the central pipe (50). The water injection channel also communicates with the water injection cavity (40).

5. A wellbore support tubing string for expansion screens according to any one of claims 1-3, characterized in that, The expansion support structure (20) includes an expansion screen tube, which is provided with a slit (21).

6. The expansion screen pipe support wellbore process tubing string according to claim 5, characterized in that, The slits (21) are evenly distributed.

7. The expansion screen pipe support wellbore process tubing string according to claim 5, characterized in that, After the expansion suspension structure (10) and expansion support structure (20) are expanded, the inner diameter of the expansion screen tube is equal to the inner diameter of the first connecting section (121), the inner diameter of the expansion section (122), and the inner diameter of the second connecting section (123).

8. The expansion screen support wellbore process tubing string according to claim 1, characterized in that, It also includes a guide shoe (60) connected to the end of the expansion support structure (20) away from the wellhead.

9. A construction method for an expansion screen pipe supporting a wellbore process tubing string, characterized in that, Including the expansion screen support wellbore process tubing as described in any one of claims 1-8, the construction method includes the following steps: The expansion support string is lowered into the well at a predetermined position. The expansion suspension structure (10) is expanded and fixed inside the well casing; The expansion support structure (20) expands and fits tightly against the well wall.

10. A construction method for an expansion screen pipe-supported wellbore process tubing string according to claim 9, characterized in that, The expansion and fixation of the expansion suspension structure (10) inside the well casing includes the following steps: The expansion cone (11) is driven to move upward by pressurizing the water injection chamber (40) inside the expansion suspension structure (10) through the central pipe (50), so that the expansion section (122) of the expansion suspension structure (10) expands and is fixed on the well pipe. Continue to pressurize until the expansion cone (11) detaches from the expansion suspension structure (10), and remove the central tube (50) and the expansion cone (11); The steps to make the expansion support structure (20) expand and fit tightly against the well wall include the following: An expansion tool (70) is inserted into the expansion support string, and pressure is applied through the conical head (71) of the expansion tool (70) to break the pressure plate (30); The expansion tool (70) continues to be lowered so that the expansion screen tube expands and adheres tightly to the well wall to form support for the well wall.

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