CN212296298U

CN212296298U - Drilling downhole blowout prevention simulation device

Info

Publication number: CN212296298U
Application number: CN202022000144.0U
Authority: CN
Inventors: 李皋; 李栋; 肖东; 谷磊; 许佳欣
Original assignee: Southwest Petroleum University
Current assignee: Southwest Petroleum University
Priority date: 2020-09-14
Filing date: 2020-09-14
Publication date: 2021-01-05
Anticipated expiration: 2030-09-14

Abstract

The utility model relates to a following drilling is prevent spouting analogue means in pit, including center pin 5, air supply 1, admission valve 2, air outlet valve 3, sealing plug 4, hydraulic bag 14, contraction type capsule fender dish (10, 11), gland nut (6, 7), compact heap (8, 9), foldable metal framework (12, 13), center pin 5 fixed hydraulic bag 14 has sealing plug 4 between center pin and the gas injection pipeline, and the gas injection pipeline is connected with air supply 1, is provided with admission valve 2, air outlet valve 3 on the pipeline, and the middle pipeline of center pin is communicated with hydraulic bag as the gas injection input port, and hydraulic bag top and bottom are provided with contraction type capsule fender dish 10, 11, and capsule fender dish is outer to have gland nut 6, 7, and the inside corresponding position of hydraulic bag has compact heap 8, 9, presss from both sides tightly and fixes the hydraulic bag; the retractable capsule baffle disc is connected with the folding metal framework. The utility model discloses a simulate real preventer setting in the pit, the pipe flow pressure distribution when being convenient for study pipe flow one-way seals change relation along with time.

Description

Drilling downhole blowout prevention simulation device

Technical Field

The utility model belongs to the oil drilling field, concretely relates to novel simulation device prevents spouting in pit along with boring for simulate real blowout preventer setting in pit, thereby study the change relation of pipe flow pressure distribution when the one-way closure of pipe flow under the blowout preventer setting state in pit.

Background

With the deep development of oil and gas development, the oil and gas development gradually turns to deep stratum, the characteristics of high temperature, high pressure and ultra-deep are presented, the oil and gas reservoirs are easy to overflow, kick and even possibly induce blowout accidents, the conventional blowout preventer at a wellhead and the downhole blowout preventer can be used for controlling the pressure in the well to prevent the blowout accidents, but the initial condition is underbalance at the well bottom, so fluid still enters the interior of the pipe flow, and the pressure of the closed part of the pipe flow is increased. And when the blowout preventer is serious, the downhole blowout preventer fails, and the function of the downhole protective barrier is lost. Thus, it is necessary to study the change in pipe flow pressure distribution over time when the pipe flow is unidirectionally closed in the setting of a blowout preventer with drilling fluid stopped from circulating.

However, in a circulation stopping state, the flow law of the downhole multiphase flow cannot be predicted, and particularly, the downhole multiphase flow cannot be known under the condition that a well head is not ejected out of drilling fluid, so that a novel downhole blowout prevention simulation device while drilling based on a laboratory environment needs to be developed so as to facilitate research on the change relation of pipe flow pressure distribution with time when pipe flow is unidirectionally closed.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a following drilling is prevent spouting analogue means in pit, the device principle is reliable, and is easy and simple to handle, through simulating real blowout preventer setting in pit, pipe flow pressure distribution when studying the one-way closed of pipe flow is along with the change relation of time to solved under the closed cycle state, the unable prediction scheduling problem of multiphase flow law in the pit.

In order to achieve the technical purpose, the utility model adopts the following technical scheme.

A drilling downhole blowout prevention simulation device comprises a starting unit, a plugging unit and a fixing unit.

The starting unit comprises an air source, an air inlet valve and an air outlet valve, the air source and the air inlet valve are opened when an experiment is started, the air outlet valve is closed, air enters and props up the hydraulic bag through a pipeline, the underground blowout prevention simulation device while drilling is seated on the inner wall of the simulation sleeve, the air source and the air inlet valve are closed after the seating is completed, the underground blowout prevention simulation device while drilling can be kept in a seated state all the time, the air outlet valve is opened after the experiment is completed, and the hydraulic bag contracts to a natural state after the air is discharged, so that the device can be lifted and taken out.

The device can be placed at any position of a simulation sleeve, gas is injected into the hydraulic bag through a middle pipeline in the central shaft, the hydraulic bag is expanded under pressure and clings to the inner wall of the simulation sleeve to play a role in sealing the pipe, the foldable metal frameworks at the upper end and the lower end of the hydraulic bag are opened in the expansion process of the hydraulic bag, gaps between the hydraulic bag and the wall of the simulation sleeve are reduced, the hydraulic bag is prevented from being damaged, and the sealing plug is positioned at a contact part between the central shaft and the gas injection pipeline and can play a role in sealing so as to prevent gas leakage.

The fixed unit comprises a central shaft, a hexagonal gland nut, an internal capsule pressing block and a retractable capsule baffle disc, the central shaft is used for fixing the hydraulic capsule and bearing axial stress, meanwhile, an intermediate pipeline of the central shaft serves as a gas injection input port, the hexagonal gland nut and the internal capsule pressing block are used for clamping and fixing the hydraulic capsule and preventing gas leakage, the retractable capsule baffle disc can bear pressure generated after the hydraulic capsule is injected, the hydraulic capsule is restrained to deform along the axial direction of the simulation sleeve, and meanwhile, the retractable capsule baffle disc can be used for installing a folding metal framework.

Compared with the prior art, the utility model discloses following beneficial effect has:

1) the folding metal framework is utilized to bear the force and simultaneously protect the hydraulic bag;

2) the device can be placed at any position in the simulation sleeve, and the hydraulic bag is pressurized or decompressed through a middle pipeline in the central shaft to complete the expansion or contraction of the hydraulic bag;

3) low cost, convenient production and convenient replacement.

Drawings

Fig. 1 is the structure schematic diagram of the downhole blowout prevention simulation device while drilling of the utility model.

In the figure: the device comprises a gas source 1, a gas inlet valve 2, a gas outlet valve 3, a sealing plug 4, a central shaft 5, a hexagonal compression nut 6, a hexagonal compression nut 7, a compression block inside a capsule 8, a compression block inside a capsule 9, a contraction type capsule baffle disc 10, a contraction type capsule baffle disc 12, a contraction type metal framework 13, a hydraulic capsule 14, a simulation sleeve 15.

Detailed Description

The present invention is further described below with reference to the accompanying drawings so that those skilled in the art can understand the present invention. It is to be understood that the invention is not limited in scope to the specific embodiments, but is intended to cover modifications within the spirit and scope of the invention as defined and defined by the appended claims, as will occur to those skilled in the art.

See fig. 1.

A simulation device for underground blowout prevention while drilling comprises a central shaft 5, a gas source 1, a gas inlet valve 2, a gas outlet valve 3, a sealing plug 4, a hydraulic bag 14, a retractable capsule baffle disc (10, 11), a compression nut (6, 7), a compression block (8, 9) and a folding metal framework (12, 13), wherein the hydraulic bag 14 is fixed on the central shaft 5, the sealing plug 4 is arranged between the central shaft and a gas injection pipeline, the gas injection pipeline is connected with the gas source 1, the gas inlet valve 2 and the gas outlet valve 3 are arranged on the gas injection pipeline, a middle pipeline of the central shaft is used as a gas injection input port and is communicated with the hydraulic bag 14, the retractable capsule baffle disc 10, 11 is arranged at the top and the bottom of the hydraulic bag, the compression nut 6, 7 is arranged outside the capsule baffle disc, and the compression block 8, 9 is arranged at the corresponding position inside the hydraulic bag; the retractable capsule baffle disc is connected with the

folding metal frameworks

12 and 13.

The gas injection pipeline is provided with an air inlet valve, gas enters and props up the hydraulic bag through the air inlet valve, so that the underground blowout prevention simulation device while drilling is sealed on the inner wall of the simulation sleeve 15, and the change relation of pipe flow pressure distribution along with time when pipe flow is sealed in a single direction can be conveniently researched.

And the gas injection pipeline is provided with a gas outlet valve which is opened to release gas after the experiment is finished, so that the hydraulic bag is contracted to a natural state, and the device is convenient to lift and take out.

The retractable capsule baffle disc bears the pressure generated after the gas injection of the hydraulic capsule and restrains the axial deformation of the hydraulic capsule along the simulation sleeve.

The folding metal framework is unfolded in the expansion process of the hydraulic bag, occupies a gap between the hydraulic bag and the wall of the simulation sleeve and prevents the hydraulic bag from being damaged.

The device is used for simulating the setting of a real underground blowout preventer, and the process is as follows:

(1) before the experiment begins, the hydraulic bag is in a natural contraction state, the folding metal framework is not opened, and the device is put down to any position in the simulation casing;

(2) opening an air source and an air inlet valve, injecting air into the hydraulic bag through a middle pipeline in the central shaft, and positioning a sealing plug at a contact part between the central shaft and an air injection pipeline to prevent air leakage;

(3) gas enters and props up the hydraulic bag through a pipeline, the hydraulic bag is expanded under pressure and is tightly attached to the inner wall of the simulation casing pipe, so that the underground blowout prevention simulation device while drilling is seated on the inner wall of the simulation casing pipe;

(4) in the expansion process of the hydraulic bag, the folding metal frameworks at the upper end and the lower end are opened, so that the gap between the hydraulic bag and the wall of the simulation sleeve is reduced, and the hydraulic bag is prevented from being damaged by extrusion;

(5) and after the experiment is finished, opening the gas outlet valve, after the gas is released, contracting the hydraulic bag to a natural state, and lifting up and taking out the device.

Claims

1. A simulation device for underground blowout prevention while drilling comprises a central shaft (5), an air source (1), an air inlet valve (2), an air outlet valve (3), a sealing plug (4), a hydraulic bag (14), a retractable capsule baffle disc (10, 11), a gland nut (6, 7), a gland block (8, 9) and a folding metal framework (12, 13), and is characterized in that the central shaft (5) is used for fixing the hydraulic bag (14), the sealing plug (4) is arranged between the central shaft and an air injection pipeline, the air injection pipeline is connected with the air source (1), the air inlet valve (2) and the air outlet valve (3) are arranged on the air injection pipeline, a middle pipeline of the central shaft is used as an air injection input port and communicated with the hydraulic bag, the retractable capsule baffle discs (10, 11) are arranged at the top and the bottom of the hydraulic bag, the gland nut (6, 7) is arranged outside the capsule baffle disc, the gland block (8, clamping and securing the hydraulic bladder; the retractable capsule baffle disc is connected with folding metal frameworks (12, 13).

2. The drilling-while-drilling downhole blowout prevention simulation device as recited in claim 1, wherein an air inlet valve is arranged on the air injection pipeline, and air enters through the air inlet valve and props open a hydraulic bag, so that the drilling-while-drilling downhole blowout prevention simulation device is sealed on the inner wall of the simulation sleeve.

3. The downhole blowout prevention while drilling simulation device as recited in claim 1, wherein an air outlet valve is arranged on the air injection pipeline, and the air outlet valve is opened to release air after the experiment is finished, so that the hydraulic bag is contracted to a natural state, and the device is conveniently lifted and taken out.

4. The downhole blowout prevention while drilling simulation device of claim 1, wherein the collapsible capsule baffle disc bears pressure generated by the hydraulic capsule after gas injection to restrain the hydraulic capsule from deforming along the axial direction of the simulation sleeve.

5. The downhole blowout prevention while drilling simulation device of claim 1, wherein the collapsible metal framework is expanded during expansion of the hydraulic bladder to occupy a gap between the hydraulic bladder and the wall of the simulation casing to prevent damage to the hydraulic bladder.