CN207470146U - Retractable three-stage sealing blowout preventer - Google Patents

Abstract

The utility model discloses a tertiary sealed blowout preventer of retractable has solved the nonadjustable problem of current blowout preventer length. Comprises three sealing short sections, a pressure relief short section and a choke pipe; the choke tube comprises a fixed choke tube and a replacement choke tube; the replacement choke tube is detachable from the tube string and the test cable; the replacement choke tube is arranged in the pressure relief short section, and the disassembled replacement choke tube is positioned by the sealing short section and the fixed choke tube to enter the pressure relief short section for filling. The device can be fast fixed on the roller together with the cable head, does not need to chop the cable, saves a series of additional operations such as making the cable head, correcting the cable, and the like, avoids the consumption of materials and the waste of time, and is convenient to assemble, the instrument is smooth to get into the well, the overflow volume is low, and the security is high.

Description

Retractable three-stage sealing blowout preventer

technical field

The utility model relates to a well logging sealing blowout prevention box in the field of oil field logging.

Background technique

The traditional single-stage logging sealing blowout preventer has too much overflow when used, and the multi-stage sealing blowout preventer developed later includes three sets of sealing nipples, three choke pipes, one pressure relief short, and one high-pressure quick connector 1. One high-pressure valve with a total length of 1.2 meters. The maximum length of the space for fixing the blowout preventer and the cable head in the logging drum is 0.9 meters. It cannot be fixed on the drum. At this time, the cable must be chopped, and the blowout preventer must be removed to fix it. When the isotope water absorption profile logging is performed again, a series of operations such as making the cable head and calibrating the cable must be performed. These operations greatly increase the cost of logging, reduce the efficiency of logging, and affect the progress of logging construction.

Contents of the invention

In view of this, the utility model provides a retractable three-stage sealing blowout preventer, the length of the blowout preventer box can be shortened at the end of well logging, ensuring that the blowout preventer and the cable head are fixed in the middle of the drum at the same time, avoiding cutting cables and making A series of operations such as cable head and calibration cable can reduce the cost of well logging and improve the efficiency of well logging.

In order to realize the above-mentioned purpose of the invention, the technical scheme that the utility model adopts is:

A retractable three-stage sealing blowout preventer, comprising:

Three sealing nipples, pressure relief nipples and choke tubes;

The pressure relief joint is connected to a high-pressure pipe, and one of the sealing joints is connected to an overflow pipe;

The test cable is sealed in the center of the pipe string composed of the sealing pup joint, the pressure relief pup joint and the choke tube connection;

The choke tube includes a fixed choke tube and a replacement choke tube;

The replacement choke tube is detachable from the tube string and the test cable;

The replacement choke tube is placed in the pressure relief sub-joint, and the position of the disassembled replacement choke tube is entered into the pressure relief sub-joint by the sealing sub-joint and the fixed choke tube for filling.

Preferably, the wall of the replacement choke tube is provided with a cable outlet running through its length.

Preferably, the assembly of the fixed choke tube and the sealing sub-joint is sealed and connected to the pressure-relieving sub-joint, and then fixedly connected to the pressure-relieving sub-joint through an adapter joint and fixing bolts.

Preferably, a sealing gasket is arranged in the sealing short joint.

Preferably, the sealing gasket includes a sealing rubber gasket and an iron gasket.

Preferably, the replacement choke tube has a length of 0.3-0.4 meters.

The beneficial effects of the utility model:

The retractable three-stage seal blowout preventer of this application is based on the original multi-stage seal blowout preventer, and a detachable choke tube is designed, and the structure of the pressure relief nipple is changed, and the detachable choke The pipe is placed in the pressure relief nipple, and the connection mode between the pressure relief nipple and the fixed choke pipe is changed at the same time, so that when the blowout preventer is not in use, the fixed choke pipe can go deep into the pressure relief nipple instead of being disassembled The position of the down choke pipe is shortened to achieve the purpose of shortening the overall length of the blowout preventer.

When it is necessary to switch to other logging projects to replace the cable, the retractable three-stage sealing blowout preventer can be quickly fixed on the drum together with the cable head, without having to chop the cable, saving the trouble of making the cable head and calibrating the cable. A series of additional operations avoid material consumption and time waste, thus saving considerable logging costs. In addition, the assembly of the device is convenient during use, the instrument goes down well smoothly, the overflow is low, the safety is high, and the investment is small.

Description of drawings

Through the following description of the embodiments of the utility model with reference to the accompanying drawings, the above-mentioned and other purposes, features and advantages of the utility model are more clear, in the accompanying drawings:

Fig. 1 is a structural schematic diagram of a retractable three-stage sealing blowout preventer according to an embodiment of the utility model.

Fig. 2 is a structural schematic diagram of a replacement choke tube.

FIG. 3 is a sectional view of FIG. 2 .

Fig. 4 is a structural schematic view of the retractable three-stage sealing blowout preventer during construction.

Fig. 5 is a schematic diagram of the structure of the retractable three-stage sealed anti-blowout box after shortening.

Detailed ways

The following describes the present invention based on examples, but it should be noted that the present invention is not limited to these examples. In the following detailed description of the present utility model, some specific details are described in detail. However, those skilled in the art can also fully understand the utility model for the parts that are not described in detail.

In addition, those of ordinary skill in the art should understand that the provided drawings are only for illustrating the purpose, features and advantages of the present utility model, and the drawings are not actually drawn to scale.

At the same time, unless the context clearly requires, the words "include", "include" and other similar words in the entire specification and claims should be interpreted as an inclusive meaning rather than an exclusive or exhaustive meaning; that is, "include but not limited to the meaning of ".

Fig. 1 is a structural schematic diagram of a retractable three-stage sealing blowout preventer according to an embodiment of the utility model. As shown in Figure 1, a retractable three-stage sealing blowout preventer includes:

The first sealing pup 1, the second sealing pup 3, the third sealing pup 6, the pressure relief pup 4 and the choke tube;

A high-pressure pipe joint 10 is provided on the pressure relief joint 4, and an overflow pipe joint 7 is provided on the first sealing joint 1;

The test cable is sealed in the center of the pipe string composed of the first sealing pup 1, the second sealing pup 3, the third sealing pup 6, the pressure relief pup 4 and the choke tube connection;

A choke tube, including a fixed choke tube 2 and a replacement choke tube 5;

The replacement choke tube 5 can be disassembled from the tube string and test cable;

The replacement choke tube 5 is placed in the pressure relief sub-joint 4, and the position of the removed replacement choke tube 5 is filled by the second sealing sub-joint 3 and the fixed choke tube 2 into the pressure relief sub-joint 4, and the pipe string as a whole shortened in length.

Further, as shown in FIG. 2 and FIG. 3 : the choke tube 5 is replaced, and the wall thereof is provided with a cable outlet running through its length.

Further, as shown in Figure 1: the assembly after the fixed choke tube 2 is sealed and connected with the second sealing sub-section 3 is plugged with the pressure relief sub-section 4, and then connected to the pressure relief sub-section through the adapter 8 and the fixing bolt. Section 4 is fixedly connected.

Further, as shown in FIG. 1 : the first sealing pup joint 1 , the second sealing pup joint 3 , and the third sealing pup joint 6 are all provided with sealing rubber pads and iron pads 9 .

Further, the length of the replacement choke tube 5 is 0.3-0.4 meters.

Specifically, in conjunction with Fig. 1, Fig. 4 and Fig. 5, the installation and use of the utility model are described in detail:

When logging:

1. Pass the logging cable sequentially through the first sealing nipple 1, the fixed choke tube 2, the adapter 8, the second sealing nipple 3, the third sealing nipple 6, and the pressure relief nipple 4;

2. Then add sealing rubber pads and iron pads 9 in the first sealing pup joint 1, the second sealing pup joint 3 and the third sealing pup joint 6;

3. Install the replacement choke tube 5 between the pressure relief sub-joint 4 and the third sealing sub-joint 6, and then insert the two ends of the replacement choke tube 5 into the second sealing sub-joint 3 and the third sealing sub-joint 6 to connect as One;

4. Fix the second sealing nipple 3, the replacement choke tube 5 and the third sealing nipple 6 on the pressure relief nipple 4 by using the adapter 8, the fixing bolt and the adapter 11;

5. Thread the fixed choke tube 2 to the first sealing nipple 1 and the second sealing nipple 3 at both ends respectively, and the device is fully assembled;

6. After the device is connected, make a cable head and connect it with the instrument, insert the instrument and the blowout preventer into the blowout preventer in turn, and connect the external thread of the pressure relief nipple to the blowout preventer joint;

7. Connect the overflow pipe to the overflow pipe joint 7 of the first sealing nipple 1, and connect the high-pressure pipe to the high-pressure pipe joint 10 on the pressure relief nipple 4, and then the test operation can be carried out.

When fixed:

1. When not in use, remove the sealing nipple 4 from the blowout preventer, then disassemble the adapter 11, take out the third sealing nipple 6 and the replacement choke tube 5, and remove the replacement choke tube 5;

2. Open the fixing bolt of the adapter joint 8, push the fixed choke tube 2 and the second sealing nipple 3 into the pressure relief nipple 4, and fill the empty space of the detachable choke tube 5;

3. Connect the third sealing nipple 6 with the second sealing nipple 3, and connect it with the pressure relief nipple 4 through the adapter 11;

4. After removing the replacement choke tube 5, because the length of the replacement choke tube 5 is 0.3-0.4 meters, the overall length of the device is also shortened by 0.3-0.4 meters at the same time, and the device is shortened from the original 1.2 meters to 0.9-0.8 meters. It meets the requirement that the maximum length of the space for fixing the blowout preventer and the cable head in the logging drum is 0.9 meters, so the device can be quickly fixed on the drum together with the cable head.

It can be seen from the above description that when not in use, the length of the blowout preventer can be shortened without damaging the cable, eliminating the need for a series of additional operations such as cable head and cable calibration after cutting the cable in the past. The time and material consumption of these additional operations is also saved.

The blowout preventer is connected to the high-pressure pipe. When the high-pressure valve is opened, the liquid pressure in the blowout pipe is attenuated, the residual pressure in the pressure relief joint is small, and the force of the remaining pressure on the sealing rubber pad is also small, so the cable will not The rubber pad is deformed by the high pressure and hugs the cable to ensure that the instrument can go down well smoothly.

The above-mentioned embodiment is only to express the embodiment of the utility model, and its description is relatively specific and detailed, but it should not be understood as limiting the patent scope of the utility model. It should be pointed out that those skilled in the art can make several modifications, equivalent replacements, improvements, etc. without departing from the concept of the utility model, all of which belong to the protection scope of the utility model. Therefore, the scope of protection of the utility model patent should be based on the appended claims.

Claims (6)

1. a kind of extension type three-level seals blowout hookup, including：

Three packoff nipples, pressure release pipe nipple and choke tube；

One of high-voltage tube, packoff nipple connection overflow pipe is connected on the pressure release pipe nipple；

Test cable is sealed in the pipe string center being made of the connection of the packoff nipple, the pressure release pipe nipple and the choke tube, It is characterized in that：

The choke tube including fixed choke tube and replaces choke tube；

The replacement choke tube can be disassembled from the pipe string and the cable；

The replacement choke tube is placed in the pressure release pipe nipple, and the position of replacement choke tube disassembled is by the packoff nipple And fixed choke tube enters in the pressure release pipe nipple and is filled.

2. extension type three-level according to claim 1 seals blowout hookup, it is characterised in that：

The replacement choke tube, wall are equipped with the cable outlet through its length.

3. extension type three-level according to claim 1 seals blowout hookup, it is characterised in that：

The fixed choke tube and the component after packoff nipple sealed connection, after the pressure release pipe nipple grafting, then pass through Adapter coupling and fixing bolt are fixedly connected with the pressure release pipe nipple.

4. extension type three-level according to claim 1 seals blowout hookup, it is characterised in that：

Setting gasket seal in the packoff nipple.

5. extension type three-level according to claim 4 seals blowout hookup, it is characterised in that：

The gasket seal includes seal gasket and iron pad.

6. extension type three-level according to claim 1 or 2 seals blowout hookup, it is characterised in that：

The length for replacing choke tube is 0.3-0.4 meters.