Large-drift-diameter fishable oil casing operation control valve

Abstract

The utility model belongs to the technical field of oil and gas production, well completion production increase and well repair of oil and gas fields, and particularly relates to a large-drift-diameter salvageable oil casing operation control valve which comprises a circulating valve positioning structure and a body structure. The circulating valve and the screen pipe are sequentially installed in one end of the positioning sealing cylinder, the supporting sleeve and the fishing connector are sequentially installed in the other end of the positioning sealing cylinder, the interior of the circulating valve positioning structure is through, and the circulating valve positioning structure is closed through the circulating valve. Establishing a circulating and cutting channel; the interior of the body structure is through, and the circulating valve positioning structure is installed in the body structure from one side of the body structure and then locked with the body structure through the split type locking mechanism. The large-drift-diameter design is adopted, after the circulating valve is opened, a circulating and cutting channel is established, a large liquid passing flow channel is provided, positive circulation and reverse circulation can be achieved, and meanwhile the problems that hydraulic control pipeline tie-back influences pressure testing of a flashboard blowout preventer and the like are solved.

Description

Technical Field

[0001] The utility model belongs to the technical fields of oil and gas field oil production, gas production, well completion stimulation and workover, and particularly relates to a large-diameter retrievable oil and casing operation control valve. Background Technique

[0002] In the conventional workover procedure, after the Christmas tree is removed, the control pipeline of the downhole safety valve / annular gas vent valve is depressurized and in a closed state, and reverse circulation well flushing cannot be achieved and the wire / cable operation diameter is not available before the pipe string is lifted and reconnected to the hydraulic control pipeline to establish pressure.

[0003] For example, if the control pipeline is reconnected before installing the riser and BOP group after removing the Christmas tree, the pressure test of the ram preventer cannot be achieved.

[0004] For example, if the downhole safety valve is opened by establishing pressure through connecting a stop valve at the perforating hole of the downhole safety valve on the tubing hanger before installing the riser and BOP group after removing the Christmas tree, there is a lack of downhole safety valve barrier protection during the installation of the BOP group.

[0005] The conventional Christmas tree backpressure valve is placed inside the tubing hanger, which has one-way blowout prevention, but does not have a wire / cable operation diameter after installation, is not convenient for wire and cable operations, and cannot achieve reverse circulation. Content of the Utility Model

[0006] The utility model provides a large-diameter retrievable oil and casing operation control valve to solve the problems existing in the above-mentioned prior art.

[0007] The technical solution adopted by the utility model to solve this problem is:

[0008] A large-diameter retrievable oil and casing operation control valve, comprising:

[0009] A circulation valve positioning structure, which includes a positioning seal cylinder, a circulation valve and a screen pipe sequentially installed inside one end of the positioning seal cylinder, and a support sleeve and a fishing joint sequentially installed inside the other end of the positioning seal cylinder. The inside of the circulation valve positioning structure is through and closed by the circulation valve. When the circulation valve is opened by pressurized downward movement, a circulation and cutting channel is established;

[0010] A body structure, the inside of which is through. After the circulation valve positioning structure is installed inside the body structure from one side of the body structure, it is locked with the body structure through a split locking mechanism.

[0011] In the above technical solution, the fishing joint, the support sleeve, the circulation valve and the screen pipe are sequentially arranged along the head and tail extension direction of the positioning seal cylinder.

[0012] In the above technical solution, the fishing joint is clamped at the head end of the positioning seal cylinder.

[0013] In the above technical solution, the support sleeve is fixed to the positioning and sealing cylinder through a releasing pin.

[0014] In the above technical solution, the circulation valve and the positioning and sealing cylinder are sealed with each other through a first sealing ring, and then fixed to each other through an opening pin. A check platform for preventing the circulation valve from moving upward is further provided on the inner wall of the positioning and sealing cylinder.

[0015] In the above technical solution, the circulation valve is a tubular valve body structure with a closed tail.

[0016] In the above technical solution, the screen pipe and the positioning and sealing cylinder are sealed with each other through a second sealing ring.

[0017] In the above technical solution, the screen pipe is a tubular structure with a closed tail. The inner diameter of the screen pipe is larger than the outer diameter of the circulation valve, and the screen pipe is provided with screen holes.

[0018] In the above technical solution, the positioning and sealing cylinder and the body structure are sealed with each other through a third sealing ring.

[0019] In the above technical solution, the split locking mechanism includes:

[0020] Split bosses, the number of which is several, are evenly arranged on the outer side of the positioning and sealing cylinder along the circumferential direction of the positioning and sealing cylinder;

[0021] Locking grooves are arranged on the inner side of the body structure. After the split bosses and the locking grooves are assembled in place, the circulation valve positioning structure and the body structure can rotate circumferentially and cannot move axially.

[0022] In the above technical solution, a positioning ring platform is arranged on the outer side of the body structure.

[0023] The advantages and positive effects of the present utility model are:

[0024] 1. The large-diameter retrievable oil casing operation control valve in the present utility model adopts a large-diameter design. After the circulation valve is opened, a circulation and cutting channel is established, and it has a large liquid flow channel, which can perform both positive circulation and reverse circulation, and at the same time avoids problems such as the back connection of the hydraulic control pipeline affecting the pressure test of the ram preventer.

[0025] 2. In the present utility model, the design of the integral split locking mechanism is adopted, which has the characteristics of safety, reliability and large load-bearing capacity.

[0026] 3. The present utility model has a releasing pin mechanism and adopts an internal fishing design, which reduces the length of the tool and the risk of being blocked or buried by impurities, and improves the safety of tool use. Description of the Drawings

[0027] The technical solution of the present utility model will be further described in detail below in conjunction with the drawings and embodiments. However, it should be noted that these drawings are only designed for explanatory purposes and thus do not limit the scope of the present utility model. In addition, unless otherwise specified, these drawings are only intended to conceptually illustrate the structural configurations described herein and are not necessarily drawn to scale.

[0028] Figure 1 is a schematic half-sectional structure diagram of the present utility model;

[0029] Figure 2 is Figure 1 a schematic enlarged structure diagram of part A in

[0030] Figure 3 a schematic half-sectional structure diagram of the body structure;

[0031] Figure 4 is a schematic sectional structure diagram of the circulating valve positioning structure;

[0032] Figure 5 is a schematic partial structure diagram of the positioning sealing cylinder.

[0033] In the figure: 1 - fishing joint, 2 - positioning sealing cylinder, 3 - releasing pin, 4 - support sleeve, 5 - body structure, 6 - circulating valve, 7 - opening pin, 8 - screen pipe, 9 - second sealing ring, 10 - third sealing ring, 11 - first sealing ring, 12 - check platform, 13 - screen holes, 14 - split boss, 15 - locking groove, 16 - positioning ring platform. Detailed implementation manners

[0034] First of all, it should be noted that the following will specifically illustrate the specific structure, characteristics and advantages of the present utility model by way of examples. However, all the descriptions are only for the purpose of explanation and should not be construed as any limitation to the present utility model. In addition, any single technical feature described or implied in each of the embodiments mentioned herein, or any single technical feature shown or implied in each of the drawings, can still be arbitrarily combined or deleted between these technical features (or their equivalents) to obtain more other embodiments of the present utility model that may not be directly mentioned herein. Additionally, for the sake of simplifying the drawings, the same or similar technical features may be marked only at one place in the same drawing.

[0035] In the present utility model, unless otherwise clearly specified and limited, the terms "installation", "setting", "connection", "fixation", "screwing" 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, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined, for ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances. The present utility model is described in detail below in conjunction with the accompanying drawings.

[0036] A large-diameter, fishable oil casing operation control valve comprises a circulating valve positioning structure and a body structure 5 assembled in one body, wherein:

[0037] The circulation valve positioning structure includes a positioning sealing cylinder 2, a circulation valve 6 and a screen tube 8 sequentially installed in one end of the positioning sealing cylinder 2, and a support sleeve 4 and a salvage joint 1 sequentially installed in the other end of the positioning sealing cylinder 2. The circulation valve positioning structure is internally connected and closed by the circulation valve 6. When the circulation valve 6 is opened by downward pressure, a circulation and cutting channel is established;

[0038] The main body structure 5 is connected internally, and the circulation valve positioning structure is inserted into the main body structure 5 from one side of the main body structure 5 and locked with the main body structure 5 through a split-flap locking mechanism.

[0039] Furthermore, in this embodiment, it can also be considered that the salvage joint 1 , the support sleeve 4 , the circulation valve 6 and the screen pipe 8 are arranged in sequence along the head and tail extension direction of the positioning sealing tube 2 .

[0040] Furthermore, in this embodiment, it can also be considered that the salvage joint 1 is clamped on the head end of the positioning sealing tube 2.

[0041] Furthermore, in this embodiment, it can also be considered that the support sleeve 4 is fixed to the positioning sealing cylinder 2 via the release pin 3 .

[0042] Furthermore, in this embodiment, it can also be considered that the circulation valve 6 and the positioning sealing cylinder 2 are sealed with each other by a first sealing ring 11 and then fixed to each other by an opening pin 7. The inner wall of the positioning sealing cylinder 2 is also provided with a check platform 12 for preventing the circulation valve 6 from moving upward.

[0043] Furthermore, in this embodiment, it can also be considered that the circulation valve 6 is a tubular valve body structure with a closed tail.

[0044] Furthermore, in this embodiment, it can also be considered that the screen tube 8 and the positioning sealing cylinder 2 are sealed with each other through a second sealing ring 9.

[0045] Furthermore, it can also be considered in this embodiment that the screen pipe 8 is a tubular structure with a closed tail, the inner diameter of the screen pipe 8 is larger than the outer diameter of the circulation valve 6, and when the circulation valve 6 moves downward, it falls into the tail of the screen pipe 8.

[0046] Furthermore, it can also be considered in this embodiment that the screen pipe 8 is provided with screen holes 13, and the fluid passing through the circulation and cutting channels can flow through the screen holes 13.

[0047] Furthermore, it can also be considered in this embodiment that the positioning and sealing cylinder 2 and the body structure 5 are sealed with each other through a third sealing ring 10.

[0048] Furthermore, it can also be considered in this embodiment that the split locking mechanism includes:

[0049] Split bosses 14, the number of which is several, are uniformly arranged on the outer side of the positioning and sealing cylinder 2 along the circumferential direction of the positioning and sealing cylinder 2;

[0050] Locking grooves 15 are arranged on the inner side of the body structure 5. After the split bosses 14 and the locking grooves 15 are assembled in place, circumferential rotation can occur between the circulation valve positioning structure and the body structure 5, and axial movement cannot occur.

[0051] Furthermore, it can also be considered in this embodiment that a positioning ring platform 16 is arranged on the outer side of the body structure 5.

[0052] Working principle of the large-diameter retrievable oil casing operation control valve:

[0053] After the Christmas tree is removed, the large-diameter retrievable oil casing operation control valve is installed on the tubing hanger and relies on the internal circulation valve for sealing to block the liquid flow and assist in well control. After the blowout preventer is assembled, the return pipe string and tools can be run in and connected back. The circulation valve is opened by pressurizing with a mud pump to establish the circulation and cutting channels, and at the same time, problems such as the influence of the return connection of the hydraulic control pipeline on the pressure test of the ram preventer are avoided.

[0054] Installation procedure of the large-diameter retrievable oil casing operation control valve:

[0055] 1. Install the third sealing ring 10 and the first sealing ring 11 in the position as described above and apply lubricating oil; Figure 1 on the position above and apply lubricating oil;

[0056] 2. Install the circulation valve 6 into the positioning and sealing cylinder 2, and then install the opening pin 7;

[0057] 3. Install the screen pipe 8 and the second sealing ring 9 at the right end of the positioning and sealing cylinder 2 and tighten them;

[0058] 4. Fix the body structure 5, slowly install the above-assembled components from left to right. After the split boss 14 and the locking groove 15 in the body structure are in place, the above several component groups can only rotate within the body structure 5;

[0059] 5. Install the support sleeve 4. After the pin hole is aligned with the pin slot, install the pin 3;

[0060] 6. Finally, install the fishing sub 1;

[0061] 7. Connect to the corresponding pressure test joint on the right side. It is qualified after the pressure test.

[0062] Working process of the large-diameter retrievable oil casing operation control valve:

[0063] 1. During workover, after removing the Christmas tree, connect the wellhead operation control valve to the tubing hanger;

[0064] 2. Connect the control line stop valve on the tubing hanger, connect the pressure test pump, pressurize as required to open the downhole safety valve and the downhole gas release valve, close the stop valve, and maintain the pressure;

[0065] 3. Install the riser and the blowout preventer group;

[0066] 4. Lower the tubing at the wellhead to connect to the wellhead operation control valve;

[0067] 5. Pressure test the blowout preventer group;

[0068] 6. After the blowout preventer group passes the pressure test, apply positive pressure at the wellhead, cut the opening pin of the wellhead operation control valve, the circulation valve descends, establish circulation, and balance the upper and lower pressures;

[0069] 7. Conduct operations such as circulating and washing the well or cutting according to the on-site requirements.

[0070] The large-diameter retrievable oil casing operation control valve can meet the following functions:

[0071] 1. Well control barrier - can provide a primary well barrier unit.

[0072] 2. Can meet the wire / cable operation diameter requirements under specific circumstances.

[0073] 3. Easy to use and highly reliable.

[0074] 4. Adopt a large-diameter design.

[0075] 5. The design of the integral split locking mechanism has the characteristics of safety, reliability, and large load-bearing capacity.

[0076] 6. After the circulation valve is opened, it has a large liquid flow channel, and can perform both normal circulation and reverse circulation.

[0077] 7. It has a releasing pin mechanism and adopts an internal fishing design, which reduces the length of the tool and the risks of being blocked and buried by impurities, and improves the safety of tool use.

[0078] The above embodiments have described the present utility model in detail, but the content described is only the preferred embodiment of the present utility model and cannot be considered as defining the scope of implementation of the present utility model. All equivalent changes and improvements made according to the scope of the application of the present utility model shall still fall within the scope covered by the patent of the present utility model.

Claims

1. A large-diameter, fishable oil casing operation control valve, characterized in that: include: The circulation valve positioning structure includes a positioning sealing cylinder, a circulation valve and a screen tube sequentially installed in one end of the positioning sealing cylinder, and a support sleeve and a salvage joint sequentially installed in the other end of the positioning sealing cylinder. The circulation valve positioning structure is internally connected and closed by the circulation valve. When the circulation valve is opened by downward pressure, a circulation and cutting channel is established; The main body structure is connected inside, and the circulating valve positioning structure is inserted into the main body structure from one side of the main body structure and locked with the main body structure through a split-flap locking mechanism.

2. A large-diameter, fishable oil casing operation control valve according to claim 1, characterized in that: The salvage joint, the support sleeve, the circulation valve and the screen pipe are arranged in sequence along the head and tail extension direction of the positioning sealing cylinder.

3. The large-diameter bailed-out oil casing operation control valve according to claim 1 is characterized by: The salvage joint is clamped on the head end of the positioning sealing cylinder.

4. The large-diameter bailed-out oil casing operation control valve according to claim 1 is characterized by: The support sleeve is fixed to the positioning sealing cylinder via a release pin.

5. The large-diameter fishable oil casing operation control valve according to claim 1, characterized in that: The circulation valve and the positioning sealing cylinder are sealed with each other through a first sealing ring and then fixed with each other through an opening pin. The inner wall of the positioning sealing cylinder is also provided with a check valve for preventing the circulation valve from moving upward.

6. The large-diameter fishable oil casing operation control valve according to claim 1, characterized in that: The screen tube and the positioning sealing cylinder are sealed with each other through a second sealing ring.

7. A large-diameter, fishable oil casing operation control valve according to claim 6, characterized in that: The sieve tube is a tubular structure with a closed tail. The inner diameter of the sieve tube is larger than the outer diameter of the circulation valve. The sieve tube is provided with sieve holes.

8. The large-diameter fishable oil casing operation control valve according to claim 1, characterized in that: The positioning sealing cylinder and the main body structure are sealed with each other through a third sealing ring.

9. The large-diameter fishable oil casing operation control valve according to claim 1, characterized in that: The split-petal locking mechanism comprises: There are a plurality of petal bosses, which are evenly arranged on the outer side of the positioning sealing cylinder along the circumference of the positioning sealing cylinder; The locking groove is arranged on the inner side of the main body structure. When the petal boss and the locking groove are assembled in place, the circulation valve positioning structure and the main body structure can rotate circumferentially but cannot move axially.

10. The large-diameter fishable oil casing operation control valve according to claim 1, characterized in that: A positioning ring is arranged on the outer side of the main body structure.

Images