CN104373106A - Experimental method and experimental system of gas sealing performance of underground packer - Google Patents

Experimental method and experimental system of gas sealing performance of underground packer Download PDF

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Publication number
CN104373106A
CN104373106A CN201410224535.7A CN201410224535A CN104373106A CN 104373106 A CN104373106 A CN 104373106A CN 201410224535 A CN201410224535 A CN 201410224535A CN 104373106 A CN104373106 A CN 104373106A
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CN
China
Prior art keywords
pressure
gas
experimental
cylinder
pipeline
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Pending
Application number
CN201410224535.7A
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Chinese (zh)
Inventor
王世杰
田启忠
王卫明
刘建新
张瑞霞
杨洁
吕玮
张建
李娜
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China Petroleum and Chemical Corp
Oil Production Technology Research Institute of Sinopec Shengli Oilfield Co
Original Assignee
China Petroleum and Chemical Corp
Oil Production Technology Research Institute of Sinopec Shengli Oilfield Co
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Application filed by China Petroleum and Chemical Corp, Oil Production Technology Research Institute of Sinopec Shengli Oilfield Co filed Critical China Petroleum and Chemical Corp
Priority to CN201410224535.7A priority Critical patent/CN104373106A/en
Publication of CN104373106A publication Critical patent/CN104373106A/en
Pending legal-status Critical Current

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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00Survey of boreholes or wells
    • E21B47/10Locating fluid leaks, intrusions or movements

Abstract

The invention discloses an experimental method and an experimental system of gas sealing performance of an underground packer, which can be used for verifying the gas sealing performance of an underground gas injecting packer. The experimental method is to mount an experimental simulation packer in a high-pressure cylinder; the high-pressure cylinder is positioned in a constant-temperature box; and the high-pressure cylinder and the constant-temperature box are connected with a sealing performance experimental system through a pressure test pipeline, a sealing pipeline and a gas leakage collecting pipeline for verifying the sealing performance of the experimental simulation packer in the high-pressure cylinder. The experimental system comprises a high-pressure gas source generation device, a leaked gas metering device and a control device; the pressure test pipeline and the sealing pipeline are both connected with the high-pressure gas source generation device; the gas leakage collecting pipeline is connected with the leaked gas metering device; the control device is respectively connected with a pressure sensor, a temperature sensor and a liquid level sensor through data wires; the experimental simulation packer is sealed by the high-pressure gas source generation device, and an actual underground high-pressure gas injecting environment can be simulated; and the result accords with the actual working condition better.

Description

A kind of experimental technique of downhole packer gas seal property and experimental system
Technical field
The present invention relates to experimental technique and the equipment of petroleum industry downhole tool, particularly a kind of experimental technique of downhole packer gas seal property and experimental system, can be used to checking down-hole gas injection packer to the sealing performance of gas.
Background technology
For improving oil recovery rate, supplement stratum energy, a lot of low-permeability oil deposit has carried out gas drive exploitation, arranges some gas injection wells in oil field, uses gas injection tube column to carry out gas injection production.Comprise gas injection packer in underground gas injection pipe column, packer employs rubber-like seal, the material of seal and structure directly affects the sealing performance of packer.Packer is arranged on the down-hole of below ground about 3000 meters, environment temperature about 125 DEG C ~ 145 DEG C, and pressure is about 30MPa ~ 60MPa, and under such condition of work, the seal of packer must CO 2gas is reliably sealed in below packer, and this just needs a kind of verification method to determine its sealing performance to gas.
Existing experimental technique is positioned in sleeve pipe by the finished product of downhole packer on the ground, after utilizing hydraulic setting packer, beats clear water, check the gas sealing ability of packer with hydraulic pump in the seal cavity formed to packing element and sleeve pipe.This experimental technique has the following disadvantages: itself there is larger difference in liquids and gases medium, checks the ability of packer sealing gas to lack persuasion with liquid as medium; ground experiment carries out at normal temperatures, cannot the anticyclonic actual environment of high temperature under simulation well, and experimental data lacks persuasion; if occur in experimentation, packer sealing is bad, when the situation of leaking appears in fluid, then can only carry out metering description by visually observing, lacking scientific and precise; under whole experimentation is in hyperbaric environment, potential safety hazard is existed to operating personnel.
In order to solve the problem, determine the air-tightness of down-hole gas injection packer, need method and apparatus seal being carried out to corresponding experiment in laboratory, the temperature under simulation well, pressure and high pressure gas environment, for verifying that the gas sealing ability of seal is required.
Summary of the invention
For solving the defect of existing experimental technique and equipment, the invention provides a kind of experimental technique and experimental system of downhole packer gas seal property, can high temperature, high pressure gas environment under simulation well, utilize gas for medium inspection packer sealing performance, and can accurate-metering gas loss speed, for the structure optimization of seal and material preferably provide definite scheme.
Technical scheme of the present invention is as follows:
A kind of experimental technique of downhole packer gas seal property is installed in high pressure cylinder by experiment simulation packer, high pressure cylinder is placed in insulating box, by high pressure cylinder and insulating box by pressure testing pipeline, set the gentle body of pipeline and leak gathering line and be connected with sealing performance experimental system, verify that in high pressure cylinder, the sealing performance of packer is simulated in experiment.
The sealing performance experimental system used for the experimental technique realizing a kind of downhole packer gas seal property comprises high-pressure air source generating apparatus, gas leakage metering device and control device, pressure testing pipeline with set pipeline and be all connected with high-pressure air source generating apparatus, Leakage Gas gathering line is connected with gas leakage metering device, control device by data wire respectively with the pressure sensor be arranged in high-pressure air source generating apparatus, the temperature pick up be arranged in insulating box is connected with the liquid level sensor be arranged in gas leakage metering device, experiment simulation packer is set with high-pressure air source generating apparatus.
The present invention compared with prior art has the following advantages: test due to packer is positioned in insulating box, can actual temperature under simulation well, make experimental data have more convincingness; high-pressure air source generating apparatus is utilized to pump into high pressure CO 2or N 2, high-pressure gas injection environment that can be actual under simulation well, more can checking sealing of packer to the sealability of gas, the more realistic working condition of experimental result; experimental system is provided with gas leakage metering device, can break through the speed of packer sealing part and the time measures to gases at high pressure, can analyze the ability of packer sealing gas when gas injection operation; the high-pressure air source generating apparatus of HTHP and gas leakage metering device and control device are distributed in the both sides of protecting wall, substantially increase the safety of experiment.The present invention can be the structure optimization of down-hole gas injection packer sealing part and the selected of material makes guidance program, the structure optimized according to the present invention and selected material manufacture the seal of down-hole gas injection packer, greatly can improve the application life of underground gas injection pipe column, extend maintenance cycle, reduce operating cost, economic benefit is huge.
Accompanying drawing explanation
Fig. 1 is the configuration schematic diagram of experimental system of the present invention and experiment flow.
In figure: gas cylinder 1, pressure meter 2, gas cylinder switch 3, gas boosting pump 4, ball-and-seat 5, high-pressure gas cylinder 6, safety relief valve 7, driver's valve 8, air compressor 9, pressure sensor 10, pressure testing admission valve 11, set admission valve 12, pressure testing gas bleeder valve 13, set gas bleeder valve 14, insulating box 15, high pressure cylinder 16, set piston 17, seal 18, temperature pick up 19, gas collection valve 20, water intaking valve 21, measuring tank 22, liquid level sensor 23, vent valve 24, bleed off pipe 25, switch board 26, set mouth 28, test port 29, protecting wall 30.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described in further detail: see Fig. 1, a kind of experimental technique of downhole packer gas seal property is installed in high pressure cylinder 16 by experiment simulation packer, high pressure cylinder 16 is placed in insulating box 15, by high pressure cylinder 16 and insulating box 15 by pressure testing pipeline, set the gentle body of pipeline and leak gathering line and be connected with sealing performance experimental system, verify that in high pressure cylinder 16, the sealing performance of packer is simulated in experiment.The test medium that sealing performance experimental system uses is CO 2or N 2.Experiment simulation packer is provided with and sets piston 17 and seal 18, sets piston 17 and seal 18 is all arranged on central tube, the annular space between salable central tube and high pressure cylinder 16.
The sealing performance experimental system used for the experimental technique realizing a kind of downhole packer gas seal property comprises high-pressure air source generating apparatus, gas leakage metering device and control device, pressure testing pipeline with set pipeline and be all connected with high-pressure air source generating apparatus, Leakage Gas gathering line is connected with gas leakage metering device, control device by data wire respectively with the pressure sensor 10 be arranged in high-pressure air source generating apparatus, be arranged on the temperature pick up 19 in insulating box 15 and the liquid level sensor 23 be arranged in gas leakage metering device is connected.High-pressure air source generating apparatus comprises gas cylinder 1, gas boosting pump 4 and high-pressure gas cylinder 6, and gas cylinder 1 is Bonding pressure table 2, gas cylinder switch 3, ball-and-seat 5 and high-pressure gas cylinder 6 successively, and wherein gas boosting pump 4 is also connected with driver's valve 8 and air compressor 9; Gas boosting pump 4 is provided with control valve, and the ball seat of ball-and-seat 5 is placed in gas boosting pump 4 side.By gas boosting pump 4, low-pressure gas source is converted to high-pressure air source, wherein low-pressure gas source is provided by gas cylinder 1, export Bonding pressure table 2 and gas cylinder switch 3 in turn, then the low-pressure admission mouth of gas boosting pump 4 is accessed, gas boosting pump 4 is driven by air compressor 9, centre is controlled by driver's valve 8, and the high pressure outlet air mouth of gas boosting pump 4 connects ball-and-seat 5, then enters high-pressure gas cylinder 6.High-pressure gas cylinder 6 can store compression experiment gas, reduces because air compressor 9 is vented the pressure fluctuation of discontinuous generation, realizes air feed and the balance with gas, play systems stabilisation pressure simultaneously.The outlet line of high-pressure gas cylinder 6 is by tee piece respectively with pressure testing pipeline with set pipeline and be connected, and the outlet line between tee piece with high-pressure gas cylinder 6 is connected with pressure sensor 10; High-pressure gas cylinder 6 is provided with safety relief valve 7, prevents hypertonia from producing dangerous; The data wire of the pressure sensor 10 installed between high-pressure gas cylinder 6 outlet line and tee piece is connected to the switch board 26 of control device.After pressure testing pipeline connects pressure testing admission valve 11, the pressure testing air inlet port via insulating box 15 is connected with the pressure testing mouth 27 of high pressure cylinder 16; Pressure testing pipeline between pressure testing admission valve 11 and the pressure testing air inlet port of insulating box 15 is also connected to pressure testing blowdown line, which is provided with pressure testing gas bleeder valve 13; Set pipeline connect set admission valve 12 after, the air inlet port that sets via insulating box 15 is connected with the mouth 28 that sets of high pressure cylinder 16, pipeline is also connected to sets blowdown line the setting between air inlet port that set setting admission valve 12 and insulating box 15, it is connected to and sets gas bleeder valve 14; Setting pipeline all adopts sealing means to be connected with the junction setting mouth 28 setting air inlet port and high pressure cylinder 16 of insulating box 15; Pressure testing pipeline withthe junction of the pressure testing air inlet port of insulating box 15 and the pressure testing mouth 27 of high pressure cylinder 16 also adopts sealing means to connect, and ensures the overall sealing of a whole set of experimental system.Gas leakage metering device comprises measuring tank 22, and liquid level sensor 23 is placed in measuring tank 22; Leakage Gas gathering line one end is connected with measuring tank 22, and after connecting water intaking valve 21 and gas collection valve 20 successively, measures gas port via insulating box 15, and the other end is connected with the test port 29 on high pressure cylinder 16, and wherein water intaking valve 21 is connected with back with water inlet line.The tank body material of measuring tank 22 is organic glass, and the material of its top cover and base is stainless steel; Leakage Gas gathering line is connected on base, and its base is also connected with bleed off pipe 25, and bleed off pipe 25 is U-tube, and its end returns formula overfall on being; The top cover of measuring tank 22 is also equipped with vent valve 24, and liquid level sensor 23 loads in tank body from top cover; The tank body of measuring tank 22, top cover, base and liquid level sensor 23 all adopt sealing means to be connected with the junction of Leakage Gas gathering line.Control device comprises switch board 26, control panel and data processor, and the data wire in switch board 26 is connected with control panel and data processor; Be arranged on the pressure sensor 10 in high-pressure air source generating apparatus, the temperature pick up 19 be arranged in insulating box 15 is all connected with switch board 26 with the liquid level sensor 23 be arranged in gas leakage metering device.The temperature regulation switch of the valve of high-pressure air source generating apparatus and gas leakage metering device and switch and insulating box 15 is distributed on control panel, be connected with gas leakage metering device with high-pressure air source generating apparatus by capillary tubing, data wire and cable, the collection of experimental data, display are all completed by the process software in data processor with storage.The control valve that gas boosting pump 4 is arranged, can by the upper lower threshold value of data processor setting, the pressure of high-pressure gas cylinder 6 is kept within the specific limits, automatically can start gas boosting pump 4 lower than lower limit and carry out ftercompction, can automatically quit work higher than higher limit.Control device and be provided with protecting wall 30 between high-pressure air source generating apparatus and gas leakage metering device, control device is placed in the side of protecting wall 30, other all devices is placed on the opposite side of protecting wall 30, prevent accident, ensure the personal safety of operating personnel, ensure the security reliability of experimentation.
concrete using method:
First experiment simulation packer and high pressure cylinder 16 are assembled, put into insulating box 15, the hot environment be used under simulation well.Connect each equipment and each bar pipeline, open the power switch of insulating box 15, set experimental temperature by data processor, and carry out preheating.Temperature data is sent to the display of switch board 26 and data processor by the temperature pick up 19 in insulating box 15; Then on data processor, set the upper and lower pressure threshold of gas boosting pump 4; Open gas collection valve 20 and the vent valve 24 of measuring tank 22, ensure that in experiment simulation packer setting process, extruded air is discharged smoothly.
After equitemperature reaches setting value, open the gas cylinder switch 3 of gas cylinder 1, close pressure testing admission valve 11, set admission valve 12, pressure testing gas bleeder valve 13, set gas bleeder valve 14, start air compressor 9 and gas booster pump 4, convert gas cylinder 1 low-pressure gas out to gases at high pressure, and accumulation of energy supercharging in high-pressure gas cylinder 6, realize air feed and the balance with gas, play systems stabilisation pressure simultaneously.If the pressure in high-pressure gas cylinder 6 is higher than safe pressure, then safety relief valve 7 is opened and is carried out pressure release; The pressure of high-pressure gas cylinder 6 is sent on the display of switch board 26 and data processor by pressure sensor 10.When pressure meets requirement of experiment, open and set admission valve 12, gases at high pressure are utilized to promote to set piston 17 squeeze sealing member 18, extruded air is discharged by vent valve 24, by setting lock rings on piston 17 on central tube after seal 18 is extruded distortion, prevent resilience, set rear closedown and set admission valve 12, open and set gas bleeder valve 14 air pressure setting piston 17 top is released.
Close gas collection valve 20, in measuring tank 22, add clear water by water intaking valve 21, until bleed off pipe 25 has clear water to overflow, then close water intaking valve 21 and vent valve 24.
Open pressure testing admission valve 11 and gas collection valve 20, the sealing situation of inspection seal 18, if poor sealing, gases at high pressure will break through seal 18 from pressure testing mouth 27, enter from test port 29 along Leakage Gas gathering line measuring tank 22, because tank body has been hermetic, the gas leaked is assembled on tank body top, clear water is discharged by bleed off pipe 25, the liquid level of clear water is sent to switch board 26 and data processor by liquid level sensor 23, and liquid level is converted to the volume of gas leakage.
After experiment terminates, close all experimental facilities of experimental system, open pressure testing gas bleeder valve 13 and the air pressure in high-pressure gas cylinder 6 and high pressure cylinder 16 is released.Then by data processor for analysis experimental data, the confirmatory experiment gas seal property of the seal 18 of simulation packer, finally will set piston 17 and seal 18 is removed from high pressure cylinder 16.

Claims (10)

1. the experimental technique of a downhole packer gas seal property, experiment simulation packer is installed in high pressure cylinder (16), high pressure cylinder (16) is placed in insulating box (15), by high pressure cylinder (16) and insulating box (15) by pressure testing pipeline, set the gentle body of pipeline and leak gathering line and is connected with sealing performance experimental system, verify that the sealing performance of packer is simulated in the middle experiment of high pressure cylinder (16).
2. the experimental technique of a kind of downhole packer gas seal property according to claim 1, is characterized in that, the test medium that described sealing performance experimental system uses is CO 2or N 2.
3. for realizing the sealing performance experimental system of the experimental technique use of a claim 1 downhole packer gas seal property, it is characterized in that, comprise high-pressure air source generating apparatus, gas leakage metering device and control device, pressure testing pipeline with set pipeline and be all connected with high-pressure air source generating apparatus, Leakage Gas gathering line is connected with gas leakage metering device, control device by data wire respectively with the pressure sensor be arranged in high-pressure air source generating apparatus (10), the temperature pick up (19) be arranged in insulating box (15) is connected with the liquid level sensor be arranged in gas leakage metering device (23).
4. sealing performance experimental system according to claim 3, it is characterized in that, described high-pressure air source generating apparatus comprises gas cylinder (1), gas boosting pump (4) and high-pressure gas cylinder (6), gas cylinder (1) is Bonding pressure table (2), gas cylinder switch (3), ball-and-seat (5) and high-pressure gas cylinder (6) successively, and wherein gas boosting pump (4) is also connected with driver's valve (8) and air compressor (9); Gas boosting pump (4) is provided with control valve, and the ball seat of ball-and-seat (5) is placed in gas boosting pump (4) side.
5. the sealing performance experimental system according to claim 3 or 4, it is characterized in that, the outlet line of described high-pressure gas cylinder (6) is by tee piece respectively with pressure testing pipeline with set pipeline and be connected, and the outlet line between tee piece with high-pressure gas cylinder (6) is connected with pressure sensor (10); Safety relief valve (7) high-pressure gas cylinder (6) is equipped with.
6. the sealing performance experimental system according to claim 3 or 5, is characterized in that, described pressure testing pipeline is connected with the pressure testing mouth (27) of high pressure cylinder (16) via the pressure testing air inlet port of insulating box (15) after connecting pressure testing admission valve (11); Pressure testing pipeline between pressure testing admission valve (11) and the pressure testing air inlet port of insulating box (15) is also connected to pressure testing blowdown line, which is provided with pressure testing gas bleeder valve (13); Set pipeline connect set admission valve (12) after, the air inlet port that sets via insulating box (15) is connected with the mouth (28) that sets of high pressure cylinder (16), pipeline is also connected to sets blowdown line the setting between air inlet port that set setting admission valve (12) and insulating box (15), it is connected to and sets gas bleeder valve (14); Setting pipeline all adopts sealing means to be connected with the junction setting mouth (28) setting air inlet port and high pressure cylinder (16) of insulating box (15); Pressure testing pipeline also adopts sealing means to be connected with the junction of the pressure testing air inlet port of insulating box (15) and the pressure testing mouth (27) of high pressure cylinder (16).
7. sealing performance experimental system according to claim 3, is characterized in that, described gas leakage metering device comprises measuring tank (22), and liquid level sensor (23) is placed in measuring tank (22); Leakage Gas gathering line one end is connected with measuring tank (22), and after connecting water intaking valve (21) and gas collection valve (20) successively, gas port is measured via insulating box (15), the other end is connected with the test port (29) on high pressure cylinder (16), and wherein water intaking valve (21) is connected with back with water inlet line.
8. sealing performance experimental system according to claim 7, is characterized in that, the tank body material of described measuring tank (22) is organic glass, and the material of its top cover and base is stainless steel; Leakage Gas gathering line is connected on base, its base is also connected with bleed off pipe (25), and bleed off pipe (25) is U-tube, and its end returns formula overfall on being ;the top cover of measuring tank (22) is also equipped with vent valve (24), liquid level sensor (23) loads in tank body from top cover; The tank body of measuring tank (22), top cover, base and liquid level sensor (23) all adopt sealing means to be connected with the junction of Leakage Gas gathering line.
9. sealing performance experimental system according to claim 3, is characterized in that, described control device comprises switch board (26), control panel and data processor, and the data wire in switch board (26) is connected with control panel and data processor; Be arranged on the pressure sensor (10) in high-pressure air source generating apparatus, the temperature pick up (19) be arranged in insulating box (15) is all connected with switch board (26) with the liquid level sensor be arranged in gas leakage metering device (23).
10. the sealing performance experimental system according to claim 3 or 9, is characterized in that, described control device and be provided with protecting wall (30) between high-pressure air source generating apparatus and gas leakage metering device, control device is placed in the side of protecting wall (30).
CN201410224535.7A 2014-05-23 2014-05-23 Experimental method and experimental system of gas sealing performance of underground packer Pending CN104373106A (en)

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CN201410224535.7A CN104373106A (en) 2014-05-23 2014-05-23 Experimental method and experimental system of gas sealing performance of underground packer

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Application Number Priority Date Filing Date Title
CN201410224535.7A CN104373106A (en) 2014-05-23 2014-05-23 Experimental method and experimental system of gas sealing performance of underground packer

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108225687A (en) * 2017-12-11 2018-06-29 中盐金坛盐化有限责任公司 A kind of detection method of salt hole air reserved storeroom packer setting effect
CN108732022A (en) * 2017-04-25 2018-11-02 中国石油化工股份有限公司 Device and method for the test of packer pressure-bearing
CN110657980A (en) * 2019-11-01 2020-01-07 银川塞昊橡胶有限公司 Oil well head packing sealing performance test system
WO2020151367A1 (en) * 2019-01-21 2020-07-30 山东科技大学 Simulated comprehensive test system for gas sealing performance

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108732022A (en) * 2017-04-25 2018-11-02 中国石油化工股份有限公司 Device and method for the test of packer pressure-bearing
CN108225687A (en) * 2017-12-11 2018-06-29 中盐金坛盐化有限责任公司 A kind of detection method of salt hole air reserved storeroom packer setting effect
WO2020151367A1 (en) * 2019-01-21 2020-07-30 山东科技大学 Simulated comprehensive test system for gas sealing performance
CN110657980A (en) * 2019-11-01 2020-01-07 银川塞昊橡胶有限公司 Oil well head packing sealing performance test system
CN110657980B (en) * 2019-11-01 2022-01-04 银川塞昊橡胶有限公司 Oil well head packing sealing performance test system

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Application publication date: 20150225