CN204899869U - Deep water special use preventer jet douche under water nipple joint - Google Patents

Abstract

The utility model discloses a jet flushing joint of an underwater blowout preventer special for deep water, which comprises a joint. A sliding sleeve is arranged inside the joint. The wall is also symmetrically provided with nozzles through a retaining spring, an upper plug and a lower plug are arranged in the sliding sleeve, and a pressure difference shearing nozzle is arranged between the upper plug and the lower plug. Through the design of plugs and nozzles, the utility model realizes the standardized cleaning operation of the underwater blowout preventer without separate drilling, and can greatly reduce the non-production time caused by debris, which not only saves operation time, but also reduces operation risks .

Description

Jet flushing nipple of underwater blowout preventer for deep water

technical field

The utility model relates to the technical field of deep-water well completion shaft cleaning, in particular to a jet flushing nipple of a special underwater blowout preventer for deep water.

Background technique

Over the past few decades, the oil industry has continued to expand from shallow seas to deep seas, and then to ultra-deep seas. The proportion of total offshore oil and gas production in the world's total oil and gas production has risen from 20% in 1997 to more than 40% at present, of which deep-sea oil and gas production accounts for more than 30% of offshore oil and gas production. Among the world's discovered oil and gas recoverable reserves, marine oil and gas account for about 41%. The degree of exploration in some sea areas, especially the deep sea and arctic areas, is still very low, so the potential of offshore oil and gas resources is still great. The deep sea has become a hotspot for global oil and gas exploration and development, and the daily cost of deepwater drilling and completion is expensive, so it is necessary to minimize non-production operation time. According to foreign research, in the production process of drilling and completion, non-productive time caused by unclean wellbore accounts for 30% of all non-productive time.

The cleanliness of subsea BOP in the field of deepwater drilling and completion is closely related to the risk of subsequent drilling and completion operations. The cleaning operation of subsea BOP has become a routine operation in deepwater drilling and completion. At present, the cleaning operation of underwater blowout preventers in the field of deepwater drilling and completion mostly relies on simple on-site blind plugging circulation nipples with holes (or balling circulation nipples). The operation time is low and the cleaning effect cannot be guaranteed. Therefore, it is necessary to design a special underwater blowout prevention The underwater blowout preventer is cleaned with the tool cleaning tool, so that the cleaning operation of the deep water underwater blowout preventer is standardized and standardized.

Utility model content

The purpose of this utility model is to overcome the deficiencies in the prior art, and provide a jet flushing pup joint for deep water special underwater blowout preventers. The standardized cleaning operation of the sprayer can greatly reduce the non-production time caused by debris, which not only saves operating time, but also reduces operating risks

The purpose of this utility model is achieved by the following technical solutions:

A jet flushing pup joint of underwater blowout preventer special for deep water, including a joint, a sliding sleeve is arranged inside the joint, and shear pins for fixing the sliding sleeve are symmetrically arranged on the side wall of the joint, and the side wall of the joint is also passed through a circlip Nozzles are symmetrically arranged, and an upper plug and a lower plug are arranged in the sliding sleeve, and a pressure difference shearing nozzle is arranged between the upper plug and the lower plug.

An O-shaped sealing ring is arranged between the joint and the sliding sleeve.

An O-ring is arranged between the sliding sleeve and the lower plug.

Both the nozzle and the differential pressure shear nozzle are composed of polycrystalline diamond drill bits.

The outer diameter of the joint is in the range of 160-220mm.

The length of the joint is 1000-1100mm.

Compared with the prior art, the beneficial effects brought by the technical solution of the utility model are:

1. A sliding sleeve is provided in the sub joint of the utility model through the shear pin, and the shear pin is caused by the change of the fluid flow rate, and the bypass flushing hole is opened, and the internal pressure of the drill string at the bottom of the hole can be transmitted in real time while the bypass is circulating flushing. It has a higher safety factor and is more conducive to dealing with complex underground situations.

2. The utility model is equipped with a nozzle and a differential pressure shear nozzle to ensure the cleaning and stability of the underwater blowout preventer, and the nozzle adopts a split design, and the size of the nozzle can be adjusted according to different operating conditions.

3. The joints of the pup joints of the utility model can cooperate with the scraper cleaning well drilling string through the screw connection mode, and jointly complete the cleaning of the underwater blowout preventer and improve the operating efficiency.

Description of drawings

Fig. 1 is a structural representation of the utility model.

Reference signs: 1-joint 2-sliding sleeve 3-shear pin 4-nozzle 5-upper plug 6-lower plug 7-pressure differential shear nozzle 8-O-shaped sealing ring

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described:

As shown in Figure 1, a submerged blowout preventer special for deep water jet flushing sub, including a joint 1, a sliding sleeve 2 is arranged in the joint 1, an O-shaped sealing ring 8 is arranged between the joint 1 and the sliding sleeve 2, and the joint The side wall of 1 is symmetrically provided with a shear pin 3 for fixing the sliding sleeve 2, and the side wall of the joint 1 is also symmetrically provided with a nozzle 4 through a circlip, and the sliding sleeve 2 is provided with an upper plug 5 and a lower plug An O-shaped sealing ring 9 is arranged between the head 6 , the sliding sleeve 2 and the lower plug 6 , and a differential pressure shearing nozzle 7 is arranged between the upper plug 5 and the lower plug 6 . In this embodiment, both the nozzle 4 and the differential pressure shearing nozzle 7 are composed of polycrystalline diamond drill bits, and the length of the joint 1 is 1040 mm.

The joint 1 can cooperate with the scraper cleaning drill string through a threaded connection to jointly complete the cleaning of the underwater blowout preventer and improve the operational efficiency.

Concrete use method of the present utility model is as follows:

When the utility model is working, the shear pin 3 is cut, and the nozzle 4 is opened to carry out a large displacement cycle. When cleaning the blowout preventer, first turn on the speed and then turn on the pump, in case the nozzle 4 is opened, and the long-term flushing of a certain position to cause damage to the blowout preventer,

When cleaning, run the pup joint of the utility model into the blowout preventer pipe string section that needs to be cleaned, run the drill joint 1 to the required position (pay attention to control the lowering speed), and set the flushing parameters as follows: the displacement is about 10-15 barrels/minute , Rotate at 10 rpm, rinse up and down at least 3 times. Stop the pump and lift up the pup joint of the utility model, and conduct a switch function test on the blowout preventer (shear ram function test is strictly prohibited). After the experiment is completed, continue the above steps to flush the blowout preventer, and the removed debris can be circulated out of the wellhead Or it is recovered by the debris grabber on the ground below, and after the pup joint of the utility model is pulled out, check the pup joint of the utility model and the recovery of debris.

Claims (6)

1. a deep water special subsea blowout preventer jet douche pipe nipple, comprise joint, it is characterized in that, sliding sleeve is provided with in described joint, the shear pin that what joint sidewall was symmetrical be provided with for fixing sliding sleeve, joint sidewall also by jump ring symmetrical be provided with nozzle, be provided with upper plug head and lower end cap in described sliding sleeve, be provided with between upper plug head and lower end cap pressure reduction shear nozzle.

2. a kind of deep water according to claim 1 special subsea blowout preventer jet douche pipe nipple, is characterized in that, is provided with 0 shape sealing ring between described joint and sliding sleeve.

3. a kind of deep water according to claim 1 special subsea blowout preventer jet douche pipe nipple, is characterized in that, is provided with 0 shape sealing ring between described sliding sleeve and lower end cap.

4. a kind of deep water according to claim 1 special subsea blowout preventer jet douche pipe nipple, is characterized in that, described nozzle and pressure reduction are sheared nozzle and formed by polycrystalline diamond compact bit.

5. a kind of deep water according to claim 1 special subsea blowout preventer jet douche pipe nipple, is characterized in that, the external diametrical extent of described joint is 160-220mm.

6. a kind of deep water according to claim 1 special subsea blowout preventer jet douche pipe nipple, is characterized in that, the length of described joint is 1000-1100mm.