CN113513286A - System for evaluating extrusion failure of production casing pipe during packer deblocking - Google Patents
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Abstract
The invention discloses a system for evaluating the extrusion failure of a production casing when a packer is unpacked, which comprises a computing device, an ultrasonic liquid level detector, a density tester, an oil well data database server and a liquid pressure tester, wherein the computing device is used for calculating the extrusion failure of the production casing when the packer is unpacked; the computing device is respectively connected with the ultrasonic liquid level detector, the density tester, the oil well data base server and the liquid pressure tester; the ultrasonic liquid level detector is used for acquiring the depth data of the liquid level of the annular space when the packer is unsealed and sending the depth data of the liquid level of the annular space when the packer is unsealed to the computing device; the density tester is used for acquiring density data of liquid in the oil pipe and sending the density data of the liquid in the oil pipe to the computing device; the liquid pressure tester is used for acquiring oil layer static pressure data and sending the oil layer static pressure data to the computing device. The device can quickly, economically and reliably evaluate the extrusion failure risk of the production casing when the packer is unset.
Description
Technical Field
The invention belongs to the technical field of integrity and safety of oil and gas well pipe columns, and particularly relates to a method for evaluating extrusion failure of a production casing when a packer is unsealed.
Background
The packer is an important safety barrier for packing an oil pipe and an oil sleeve annulus of a deep high-temperature high-pressure oil well, and the annular protection liquid in the air of the oil sleeve annulus is important for reducing the corrosion of the sleeve and preventing the sleeve from being damaged by squeezing. However, in the later stage of oil well production, the liquid level of an oil pipe is reduced due to the reduction of the formation pressure, if the packer is normally or abnormally unsealed at the moment, the oil sleeve annulus and the oil pipe are connected to form a U-shaped pipe, an annulus protection liquid column moves downwards under the driving of the upper and lower differential pressures of the packer and generates suction pressure in the air of the oil sleeve ring, so that the effective and external pressure of the production sleeve is increased instantly, and the sleeve faces the risk of extrusion failure.
Because all in current casing string structure and the intensity design standard according to considering intraductal certain undermining degree of depth calculation sleeve pipe effective external pressure, do not consider the suction pressure that the annular space protection fluid column descends and arouse after the packer deblocking influence effective external pressure of production sleeve pipe, therefore can't effectively carry out the production sleeve pipe extrusion failure risk assessment and measure formulation after the packer deblocking, lead to the on-the-spot packer deblocking production sleeve pipe collapse accident of oil field to take place occasionally. Therefore, obtaining the equivalent hollowing depth of the production casing after the deep oil well packer is unsealed and establishing the extrusion failure criterion of the production casing is important for evaluating the failure risk of the casing, perfecting the external extrusion resistance strength design of the casing and ensuring the safe service of the whole life cycle of the casing.
Disclosure of Invention
The invention aims to provide a system for quickly, economically and reliably evaluating the extrusion failure of a production casing when a packer is unsealed.
The invention provides a system for evaluating the extrusion failure of a production casing when a packer is unpacked, which comprises a computing device, an ultrasonic liquid level detector, a density tester, an oil well data database server and a liquid pressure tester, wherein the computing device is used for calculating the extrusion failure of the production casing when the packer is unpacked;
the computing device is respectively connected with the ultrasonic liquid level detector, the density tester, the oil well data base server and the liquid pressure tester;
the ultrasonic liquid level detector is used for acquiring the depth data of the liquid level of the annular space when the packer is unsealed and sending the depth data of the liquid level of the annular space when the packer is unsealed to the computing device;
the density tester is used for acquiring density data of liquid in the oil pipe and sending the density data of the liquid in the oil pipe to the computing device;
the liquid pressure tester is used for acquiring oil layer static pressure data and sending the oil layer static pressure data to the computing device;
the calculation device acquires packer setting depth data, oil layer middle depth data, annular protection liquid density data, annular protection liquid dynamic viscosity data, in-pipe liquid density data during production casing strength design, production casing inner diameter data, packer unsealed rubber tube outer diameter data, oil pipe outer diameter data, packer rubber tube height data, production casing design external extrusion resistance safety coefficient data, production casing design hollowing depth data and production casing allowable external extrusion resistance safety coefficient data from an oil well data base server;
the computing device performs the steps of:
the method comprises the following steps: the pressure difference delta P between the upper part and the lower part of the packer during the unpacking process is calculated and obtained by adopting the following formulap
In the formula,. DELTA.PpThe unit of the pressure difference between the upper part and the lower part of the packer is Pa and H when the packer is unpackedpThe setting depth of the packer is m, HaWhen the packer is unsealed, the unit of the depth of the liquid level of the annular space is m, HwThe depth of the middle part of the oil layer is m, PfThe static pressure unit of the oil layer is Pa, rhoaThe density unit of the annular protection liquid is kg/m3，ρoThe unit of the density of liquid in the oil pipe is kg/m3G is the gravity acceleration of 9.8m/s2；
Step two: calculating and obtaining the flow velocity V of the annular protection fluid passing through the micro-annular space between the packer rubber sleeve and the production casing when the packer is unsealed by adopting the following formulap
In the formula, VpThe flow rate of the annular protection fluid passing through the micro annular space between the packer rubber sleeve and the production casing when the packer is unpacked is m/s and muaThe hydrodynamic viscosity unit of the annular protection fluid is Pa.s, DciFor the production of casing with inner diameter unit of m, DpoThe unit of the outer diameter of the rubber sleeve after the packer is unsealed is m, WpThe height unit of the packer rubber cylinder is m;
step three: calculating and obtaining the descending flow velocity V of the annular protection liquid column when the packer is unsealed by adopting the following formulaa
In the formula, VaThe unit of the descending flow velocity of the annular protection liquid column is m/s when the packer is unsealed, and D isooThe unit of the outer diameter of the oil pipe is m;
step four: calculating and obtaining the annular suction pressure P of the oil sleeve when the packer is unsealed by adopting the following formulas
In the formula, PsThe unit of suction pressure of an oil sleeve annulus is Pa when the packer is unsealed;
step five: calculating and obtaining the equivalent hollowing depth H of the production casing when the packer is unsealed by adopting the following formulae
In the formula, HeThe unit of the equivalent hollowing depth of the production casing when the packer is unsealed is m; rhoidThe density unit of liquid in the pipe is kg/m when the pipe is designed for producing the strength of the sleeve3；
Step six: calculating and obtaining actual external extrusion resistance safety coefficient S of the production casing when the packer is unsealed by adopting the following formular
In the formula, SrThe actual external extrusion resistance safety factor of the production casing when the packer is unset is expressed in a dimensionless unit SdThe safety factor unit of the external extrusion resistance designed for producing the casing is dimensionless, HdDesigning the hollowing depth unit for the production casing to be m;
step seven: the actual external extrusion resistance safety coefficient S of the production casing calculated in the step sixrAnd allowed external extrusion resistance safety factor SaContrast, if S is satisfiedr≤SaAnd if so, judging that the production casing is damaged and failed by extrusion by the computing device, otherwise, judging that the production casing is safe.
Specific embodiments of the present application are disclosed in detail with reference to the following description and the accompanying drawings, which specify the manner in which parameters of the present application are calculated. It should be understood that the embodiments of the present application are not so limited in scope. The embodiments of the application include many variations, modifications and equivalents within the spirit and scope of the appended claims.
The invention has the beneficial effects that: the method and the device can quickly and economically evaluate the risk of extrusion failure of the production casing by calculating the equivalent hollowing depth of the production casing when the packer is unset and correcting the actual anti-extrusion safety coefficient of the production casing, and have high reliability.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the application, are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. It is to be expressly understood that the drawings described below are only illustrative of some embodiments of the invention.
FIG. 1 is a flow chart for evaluating production casing squeeze failure when a packer is unset.
Figure 2 is a system architecture diagram of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments.
The invention provides a system for evaluating extrusion failure of a production casing when a packer is unset, and belongs to the technical field of integrity and safety of oil and gas well pipe columns. Deep high temperature high pressure oil well production later stage packer deblocking will lead to the decline of oil jacket annular space protection liquid column to the intraductal obvious suction pressure that produces of induced production sleeve, the sleeve pipe faces the extrusion risk of inefficacy. At present, the effective external pressure of a casing is calculated according to a certain hollowing depth in a casing string structure and strength design specification, and the influence of the suction pressure caused by the descending of an annular protection liquid column after a packer is unsealed on the effective external pressure of a production casing is not considered, so that the evaluation and measure making of the extrusion failure risk of the production casing after the packer is unsealed can not be carried out, the extrusion failure accident of the production casing after the packer is unsealed on the oil field can be caused, and the comprehensive development benefit of the oil field can be seriously influenced. The invention utilizes the U-shaped pipe pressure balance principle to calculate the pressure difference between the upper part and the lower part of the packer after the packer is unsealed, calculates the flow rate of the annular protection liquid passing through the micro-annular gap between the packer rubber cylinder and the production casing based on the fluid mechanics energy conservation principle, calculates the liquid column descending flow rate of the annular protection liquid and the induced oil casing annular suction pressure by utilizing the fluid continuity condition and the hydraulic friction formula, further calculates the equivalent hollowing depth of the production casing and corrects the actual anti-external extrusion safety coefficient to quickly and economically evaluate the risk of extrusion failure of the production casing. The method overcomes the limitation that the evaluation of the risk of extrusion failure of the production casing pipe cannot be carried out when the packer is unsealed due to the fact that the effective external pressure of the casing pipe is designed by adopting the static hollowing depth in the existing specification, and the risk of extrusion failure of the production casing pipe is quickly and economically evaluated by calculating the equivalent hollowing depth of the production casing pipe when the packer is unsealed and correcting the actual external extrusion resistance safety coefficient of the production casing pipe, so that the reliability is high.
Referring to fig. 2, the invention provides a system for evaluating the extrusion failure of a production casing when a packer is unpacked, which comprises a computing device, an ultrasonic liquid level detector, a density tester, an oil well data database server and a liquid pressure tester;
the computing device may be a computer, or a handheld device with computing capabilities;
the computing device is respectively connected with the ultrasonic liquid level detector, the density tester, the oil well data base server and the liquid pressure tester; the connection mode can be wireless connection;
the ultrasonic liquid level detector is used for acquiring the depth data of the liquid level of the annular space when the packer is unsealed and sending the depth data of the liquid level of the annular space when the packer is unsealed to the computing device;
the density tester is used for acquiring density data of liquid in the oil pipe and sending the density data of the liquid in the oil pipe to the computing device;
the liquid pressure tester is used for acquiring oil layer static pressure data and sending the oil layer static pressure data to the computing device;
the calculation device acquires packer setting depth data, oil layer middle depth data, annular protection liquid density data, annular protection liquid dynamic viscosity data, in-pipe liquid density data during production casing strength design, production casing inner diameter data, packer unsealed rubber tube outer diameter data, oil pipe outer diameter data, packer rubber tube height data, production casing design external extrusion resistance safety coefficient data, production casing design hollowing depth data and production casing allowable external extrusion resistance safety coefficient data from an oil well data base server;
the computing device performs the steps of:
the method comprises the following steps: obtaining Hp、Ha、Hw、Pf、ρa、ρoThe pressure difference delta P between the upper part and the lower part of the packer during the unpacking process is obtained by adopting the following formulap
In the formula: delta PpThe pressure difference between the upper part and the lower part of the packer is Pa when the packer is unsealed; hpSetting depth of the packer, m; haThe depth of the liquid level of the annular space when the packer is unsealed, m; hwM is the depth of the middle part of the oil layer; pfStatic pressure of oil layer, Pa; rhoaIs the density of annular protection liquid in kg/m3；ρoIs the density of liquid in the oil pipe in kg/m3(ii) a g is gravity acceleration, and is 9.8m/s2。
Step two: obtaining mua、Dci、Dpo、WpThe flow velocity V of the annular space protection liquid passing through the micro-annular space between the packer rubber sleeve and the production casing when the packer is unsealed is obtained by adopting the following formulap
In the formula: vpWhen the packer is unsealedThe flow velocity of the annular protection fluid passing through the micro-annular gap between the packer rubber cylinder and the production casing is m/s; mu.saThe annular space protection fluid has dynamic viscosity of Pa s; dciM for producing the inner diameter of the sleeve; dpoThe outer diameter m of the rubber sleeve after the packer is unsealed; wpIs the packer packing element height, m.
Step three: obtaining DooObtaining the descending flow velocity V of the annular protection liquid column when the packer is unsealed by adopting the following formulaa
In the formula: vaThe descending flow velocity of the annular protection liquid column is m/s when the packer is unsealed; dooIs the outer diameter of the oil pipe, m.
Step four: the annular suction pressure P of the oil sleeve when the packer is unsealed is obtained by adopting the following formulas
In the formula: psAnd the annular suction pressure of the oil sleeve is Pa when the packer is unsealed.
Step five: obtaining rhoidObtaining the equivalent hollowing depth H of the production casing when the packer is unset by adopting the following formulae
In the formula: heThe equivalent cut depth m of the production casing when the packer is unset; rhoidThe density of liquid in the pipe is kg/m when the strength of the casing is designed for production3；
Step six: obtaining Sd、HdObtaining the actual external extrusion resistance safety coefficient S of the production casing when the packer is unset by adopting the following formular
In the formula: srThe actual external extrusion resistance safety factor of the production casing when the packer is unset has no dimension; sdThe safety factor of external extrusion resistance is designed for producing the sleeve without dimension; hdThe undercut depth, m, is designed for production of the casing.
Step seven: obtaining SaAnd step six, calculating the actual external extrusion resistance safety coefficient S of the production casing pipe in the step sixrAnd allowed external extrusion resistance safety factor SaContrast, if S is satisfiedr≤SaAnd if so, judging that the production casing is damaged and failed by extrusion by the computing device, otherwise, judging that the production casing is safe.
In the above step Ha、Pf、ρoEach value is obtained by field measurement; hp、Hw、ρa、μa、ρid、Dci、Dpo、Doo、Wp、Sd、Hd、SaEach value can be obtained by referring to the relevant technical data of the oil well.
Example one
The following description of the present invention is provided by way of a specific example to evaluate the failure of squeeze of production casing when a packer is unset.
The depth of the liquid level of the annular space is 700m when the packer is unsealed through the measurement of an ultrasonic liquid level detector, and the static pressure of an oil layer is 4.5 multiplied by 10 through the measurement of a liquid pressure tester7Pa, the density of the liquid in the oil pipe is 800kg/m measured by a density tester3(ii) a The packer setting depth is 4500m, the oil layer middle depth is 6000m, and the annular space protection liquid density is 1050kg/m through the oil well data database server3The dynamic viscosity of the annular protection fluid is 0.07 Pa.s, and the density of the fluid in the pipe is 800kg/m when the strength of the production casing is designed3The inner diameter of the production casing is 0.15478m, the outer diameter of the rubber cylinder after the packer is unsealed is 0.15078m, the outer diameter of the oil pipe is 0.0889m, the height of the rubber cylinder of the packer is 0.15m, the safety factor of the production casing for resisting external extrusion is 1.32, the designed hollowing depth of the production casing is 4000m, and the safety factor S of the production casing for resisting external extrusion is allowedaIs 1.0.
The computing device performs the steps of:
the method comprises the following steps: the pressure difference between the upper part and the lower part of the packer when the packer is unsealed is calculated to be 5.86 multiplied by 10 according to the formula (1)6Pa。
Step two: the flow rate of the annular protection fluid passing through the micro-annular space between the packer rubber sleeve and the production casing when the packer is unsealed is calculated by the formula (2) to be 89.8 m/s.
Step three: the descending flow rate of the annular protection liquid column when the packer is unsealed is calculated to be 6.84m/s according to the formula (3).
Step four: the oil sleeve annulus suction pressure when the packer is unsealed is calculated to be 4.94 multiplied by 10 according to the formula (4)7Pa。
Step five: the equivalent cut depth of the production casing when the packer is unset is calculated from equation (5) to be 5813.5 m.
Step six: the actual external extrusion resistance safety factor of the production casing when the packer is unset is calculated by the formula (6) to be 0.91.
Step seven: because 0.91 ═ Sr≤SaAnd (4) judging that the production casing pipe is subjected to extrusion failure when the production casing pipe is 1.0.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (1)
1. A system for evaluating the extrusion failure of a production casing when a packer is unsealed comprises a computing device, an ultrasonic liquid level detector, a density tester, an oil well data database server and a liquid pressure tester;
the computing device is respectively connected with the ultrasonic liquid level detector, the density tester, the oil well data base server and the liquid pressure tester;
the ultrasonic liquid level detector is used for acquiring the depth data of the liquid level of the annular space when the packer is unsealed and sending the depth data of the liquid level of the annular space when the packer is unsealed to the computing device;
the density tester is used for acquiring density data of liquid in the oil pipe and sending the density data of the liquid in the oil pipe to the computing device;
the liquid pressure tester is used for acquiring oil layer static pressure data and sending the oil layer static pressure data to the computing device;
the calculation device acquires packer setting depth data, oil layer middle depth data, annular protection liquid density data, annular protection liquid dynamic viscosity data, in-pipe liquid density data during production casing strength design, production casing inner diameter data, packer unsealed rubber tube outer diameter data, oil pipe outer diameter data, packer rubber tube height data, production casing design external extrusion resistance safety coefficient data, production casing design hollowing depth data and production casing allowable external extrusion resistance safety coefficient data from an oil well data base server;
the computing device performs the steps of:
the method comprises the following steps: the pressure difference delta P between the upper part and the lower part of the packer during the unpacking process is calculated and obtained by adopting the following formulap
In the formula,. DELTA.PpThe unit of the pressure difference between the upper part and the lower part of the packer is Pa and H when the packer is unpackedpThe setting depth of the packer is m, HaWhen the packer is unsealed, the unit of the depth of the liquid level of the annular space is m, HwThe depth of the middle part of the oil layer is m, PfThe static pressure unit of the oil layer is Pa, rhoaThe density unit of the annular protection liquid is kg/m3，ρoThe unit of the density of liquid in the oil pipe is kg/m3G is the gravity acceleration of 9.8m/s2；
Step two: calculating and obtaining the flow velocity V of the annular protection fluid passing through the micro-annular space between the packer rubber sleeve and the production casing when the packer is unsealed by adopting the following formulap
In the formula, VpThe flow rate of the annular protection fluid passing through the micro annular space between the packer rubber sleeve and the production casing when the packer is unpacked is m/s and muaThe hydrodynamic viscosity unit of the annular protection fluid is Pa.s, DciFor the production of casing with inner diameter unit of m, DpoThe unit of the outer diameter of the rubber sleeve after the packer is unsealed is m, WpThe height unit of the packer rubber cylinder is m;
step three: calculating and obtaining the descending flow velocity V of the annular protection liquid column when the packer is unsealed by adopting the following formulaa
In the formula, VaThe unit of the descending flow velocity of the annular protection liquid column is m/s when the packer is unsealed, and D isooThe unit of the outer diameter of the oil pipe is m;
step four: calculating and obtaining the annular suction pressure P of the oil sleeve when the packer is unsealed by adopting the following formulas
In the formula, PsThe unit of suction pressure of an oil sleeve annulus is Pa when the packer is unsealed;
step five: calculating and obtaining the equivalent hollowing depth H of the production casing when the packer is unsealed by adopting the following formulae
In the formula, HeThe unit of the equivalent hollowing depth of the production casing when the packer is unsealed is m; rhoidThe density unit of liquid in the pipe is kg/m when the pipe is designed for producing the strength of the sleeve3；
Step six: the packer solution is obtained by calculation according to the following formulaActual external extrusion resistance safety coefficient S of production casing during sealingr
In the formula, SrThe actual external extrusion resistance safety factor unit of the production casing when the packer is unset is dimensionless, SdDesign of external extrusion resistance safety factor unit dimensionless for production of casing, HdDesigning the hollowing depth unit for the production casing to be m;
step seven: the actual external extrusion resistance safety coefficient S of the production casing calculated in the step sixrAnd allowed external extrusion resistance safety factor SaContrast, if S is satisfiedr≤SaAnd if so, judging that the production casing is damaged and failed by extrusion by the computing device, otherwise, judging that the production casing is safe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110811355.9A CN113513286B (en) | 2021-07-19 | 2021-07-19 | System for evaluating extrusion failure of production casing pipe during packer deblocking |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110811355.9A CN113513286B (en) | 2021-07-19 | 2021-07-19 | System for evaluating extrusion failure of production casing pipe during packer deblocking |
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| CN113513286A true CN113513286A (en) | 2021-10-19 |
| CN113513286B CN113513286B (en) | 2022-03-01 |
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| CN114278279A (en) * | 2022-01-09 | 2022-04-05 | 重庆科技学院 | Oil well casing pipe anti-crushing early warning system based on oil sleeve ring lost motion liquid level monitoring |
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| CN114278279B (en) * | 2022-01-09 | 2022-07-08 | 重庆科技学院 | Oil well casing pipe anti-crushing early warning system based on oil sleeve ring lost motion liquid level monitoring |
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