Unlock instant, AI-driven research and patent intelligence for your innovation.

An erosion-resistant choke manifold for blowout in oil and gas wells

A choke manifold and erosion-resistant technology, applied in the production fluid, wellbore/well components, wellbore/well valve device, etc. End erosion, gate valve and needle valve erosion damage, etc., to solve the erosion of the inlet end, improve the throttling efficiency, and prolong the service life.

Active Publication Date: 2017-12-15
BC P INC CHINA NAT PETROLEUM CORP +1
View PDF8 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of sudden change in the pressure drop of the fixed nozzle, inaccurate regulation of the pressure drop (that is, inaccurate control of oil and casing pressure), excessive temperature drop, and fixed outlet of the nozzle in the process of blowout after fracturing in the existing choke manifold. Severe erosion at the inlet end, erosion damage at the inlet end of the anti-erosion nipple, and severe erosion damage at the gate valve and needle valve

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • An erosion-resistant choke manifold for blowout in oil and gas wells

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Such as figure 1 As shown, an erosion-resistant choke manifold for blowout discharge in oil and gas wells includes a pipeline four-way 1-1, a pipeline five-way two 12, and a pipeline is passed between the pipeline four-way one 1 and the pipeline five-way two 12 One 15 is connected, and a manual flat gate valve four 13 is installed on the pipe one 15;

[0023] One of the pipe ports of the four-way pipe 1 is connected with a fixed throttle valve 3 through the pipe two 16. The axial center line of the pipe two 16 is perpendicular to the axial center line of the pipe one 15, and a manual pipe is installed on the pipe two 16. Flat gate valve 1-2, fixed throttle valve 3 is connected with pipeline five-way -6 through reducing sub-joint-5, and the axial centerline of reducing sub-joint-5 is parallel to the axial centerline of pipeline-15;

[0024] One of the nozzles of the pipeline bottom bracket two 12 is connected to the pipeline bottom bracket 6 through the pipeline five 19. The...

Embodiment 2

[0036] On the basis of embodiment 1, the variable diameter nozzle 4 is a hollow cylindrical structure, the inner diameter of the cavity is gradual, and the diameter near the end of the variable diameter sub 5 is the largest, and the erosion resistant variable diameter nozzle 4 throttling The pressure difference can be adjusted between 0.2 and 35MPa, and the deviation from the design pressure is within ±0.5MPa. Utilizing the change of the internal structure of the variable diameter nozzle 4, the flow rate and pressure of the fluid returning from the tubing and casing flow through the choke manifold are reduced steadily, the pressure drop is slowly reduced, and the temperature drop is gentle. The pressure control is precise, so as to effectively solve the erosion of the nozzle outlet, and at the same time avoid the formation of natural gas hydrate due to the excessive drop of the throttle temperature drop and block the throttle manifold and wellhead.

[0037] The connection method ...

Embodiment 3

[0046] The structure of the variable diameter sub-section 5 and the variable diameter sub-section two 9 are the same, the inner diameter of the inner cavity is gradual, and the diameter of the variable diameter sub-section one 5 near the end of the variable diameter nozzle 4 is the smallest, and the variable diameter sub-section two 9 The diameter near the end of the four-way pipe 8 is the smallest. Utilizing the internal structure changes of the reducing nipple 1 5 and the reducing nipple 2 9 to make the flow rate and pressure of the fluid returning from the tubing and casing flow through the throttle manifold and the pressure drop slowly decrease, The temperature drop is gentle, and the tubing and casing pressure is controlled accurately, so as to effectively solve the erosion of the inlet end of the reducing sub-joint No. 5 and the reducing sub-joint No. 9 and at the same time avoid the formation of natural gas hydrate due to the rapid decrease of the throttle temperature dro...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a blowout erosion-resistant throttle manifold for oil and gas wells. The blowout erosion-resistant throttle manifold comprises a fixed throttle valve, a manual needle throttle valve, five manual flat gate valves, two erosion-resistant reducing nipples, two pipeline crosses, two pipeline brackets and manifold pipelines. An erosion-resistant reducing oil nozzle is arranged in the fixed throttle valve, the corresponding erosion-resistant reducing nipple is mounted on downstream of the fixed throttle valve, the corresponding erosion-resistant reducing nipple is similarly mounted on downstream of the manual needle throttle valve, two throttle branches and a direct discharge branch are controlled by means of opening or closing different manual flat gate valve and needle valve combinations, and accordingly pressures of oil pipes and casings in post-fracture blowout procedures can be controlled. Compared with existing throttle manifolds controlled by gate valves or needle valves, the blowout erosion-resistant throttle manifold has the advantages that erosion of the oil nozzle, the nipples and the gate valves due to blowout liquid can be reduced, the ground throttle and pressure releasing efficiency can be improved, the replacement costs of vulnerable parts of the blowout erosion-resistant throttle manifold can be saved, the service life of the blowout erosion-resistant throttle manifold can be prolonged, the blowout erosion-resistant throttle manifold is high in practicality and suitable for post-fracture blowout operation on the oil and gas wells, and obvious effects can be realized.

Description

Technical field [0001] The invention belongs to the technical field of downhole operations such as oil and gas well fracturing and acidification, and specifically relates to an erosion-resistant choke manifold for oil and gas well blowout. Background technique [0002] At present, the multi-stage hydraulic sandblasting and annulus fracturing technology of horizontal wells has been widely promoted and applied in Changqing Oilfield. It is necessary to control the casing annulus pressure and tubing pressure during the blowout process after fracturing. Some choke manifolds usually use gate valves or needle valves for throttling, and some choke manifolds use fixed choke valves and gate valves for throttling, but due to the poor erosion resistance of gate valves, needle valves and fixed choke valves , Especially in the process of blasting operation after fracturing, there is a large amount of formation sand or perforated sand in the casing return fluid, which causes serious erosion to ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/12E21B34/00
CPCE21B34/00E21B43/12
Inventor 王祖文仝少凯白明伟张冕任荣利曹欣温亚魁徐迎新杨红斌崔会贺齐加德
Owner BC P INC CHINA NAT PETROLEUM CORP