CN107590294B - Corrosion-resistant alloy trapezoidal-slit slotted liner tube and design method thereof - Google Patents
Corrosion-resistant alloy trapezoidal-slit slotted liner tube and design method thereof Download PDFInfo
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Abstract
The invention discloses a corrosion-resistant alloy trapezoidal-slit slotted liner tube and a design method thereof. The design method comprises the following steps: a, determining the material of a slotted liner pipe; b, determining slotting parameters; c, checking the residual strength of the slotted liner pipe by a finite element analysis modeling method and combining stratum collapse pressure according to the material of the slotted liner pipe and the slotted parameters of the slotted liner pipe, and judging whether the plastic deformation areas between adjacent slots are connected or not; d, if the plastic deformation areas between the adjacent slots are not connected, carrying out an anti-extrusion strength test on the slotted liner tube sample, and judging whether the anti-extrusion strength of the slotted liner tube sample meets the requirement or not; and e, if the anti-extrusion strength of the slotted liner tube sample meets the requirement, performing an overcurrent test on the slotted liner tube sample, and judging whether the overcurrent capacity of the slotted liner tube meets the requirement. The design method is suitable for designing the corrosion-resistant alloy trapezoidal slit slotted liner tube for the deep high-temperature high-pressure high-acidity gas reservoir high-yield gas well.
Description
Technical Field
The invention relates to the technical field of development and well completion engineering safety of deep high-temperature high-pressure high-acidity gas reservoirs, in particular to a corrosion-resistant alloy trapezoidal slit liner tube and a design method thereof.
Background
Slotted liner completion is an important completion. The design of a slotted liner tube (also called a slotted screen tube) is an important link of well completion engineering, and long-term stable production of a gas well can be ensured only if various properties of the slotted liner tube meet the requirements of an actual construction environment.
At present, those skilled in the art have conducted intensive studies on the design method of slotted liner, such as numerical simulation of extrusion strength of slotted liner under non-uniform load in 2007 (Zhuang Bao Tang, Li Qian, Wuxian column. [ J ]. Natural gas industry, 2007,27(9):54-55 ]), in 2007 in Wang Lu Chao, Xuxing Ping et al (Wang Luo Chao, Xuxing Ping. slotted screen pipe strength analysis based on ANSYS [ J ]. Petroleum plant machinery, 2007,36(4):41-43 ]), in 2009 in Deng, (structural design and strength numerical simulation analysis of Duxu slotted screen pipe [ J ]. Jianghan Petroleum technology, 19(2):49-54.), in Dandong, Dahualin, Sun Li, and 2009 (Yandong, Dahualin, Sun stand upright Ding Lin, Sun Mitsu slotted screen pipe extrusion strength comprehensive finite element analysis [ J. ] 2009 ], 2009,31(5):40-44.), Zhang, Lichufu, Xuzhou and the like in 2010 (Zhang, Lichufu, Xuzhou and the like. horizontal well slotted screen pipe putting strength research [ J ]. petroleum machinery, 2010,38(3):18-21.), and Romin, Zhang, Liu Ju Bao and the like in 2011 (horizontal well screen pipe elastic-plastic finite element analysis under the action of Romin, Zhang, Liu Ju Bao and external extrusion [ J ]. Haerbin university Committee, 2011,43(1): 202-.
In the process of implementing the invention, the inventor finds that at least the following problems exist in the prior art: the existing slotted liner tube design method is designed for rectangular slotted liner tubes which are used for shallowly buried sand production oil and gas reservoirs and are made of common carbon steel materials. In the existing design method of the slotted liner, the underground loading condition of the liner is analyzed by mainly considering the pressure difference between the inside and the outside of the liner or directly adopting the ground stress, and the liner is considered to lose the integrity by mainly considering the yield of the metal material when the strength of the liner is checked. However, for the slotted liner tube used for the deep high-temperature high-pressure high-acidity gas reservoir, heavy mud is needed for killing the deep high-temperature high-pressure high-acidity gas reservoir high-yield gas well, even if sand does not appear on the stratum, the polluted sediment of the shaft during the well completion oil testing test can still block the shaft, and therefore, the common rectangular slotted liner tube made of carbon steel is not suitable for use. In conclusion, the existing design method for the rectangular slotted liner tube made of common carbon steel and used for a shallowly buried sand production oil and gas reservoir is not suitable for designing the corrosion-resistant alloy trapezoidal slotted liner tube used for a deep high-temperature high-pressure high-acidity gas reservoir high-yield gas well.
Disclosure of Invention
In order to solve the technical problems, the invention provides a design method suitable for designing a corrosion-resistant alloy trapezoidal slit liner tube for a deep high-temperature high-pressure high-acidity gas reservoir high-yield gas well, and the corrosion-resistant alloy trapezoidal slit liner tube obtained based on the design method.
Specifically, the method comprises the following technical scheme:
in a first aspect, an embodiment of the present invention provides a method for designing a corrosion-resistant alloy trapezoidal slit liner, including:
step a, determining the material of the slotted liner pipe;
step b, determining the slotting parameters of trapezoidal slotting on the slotting liner pipe, wherein the slotting parameters at least comprise: the method comprises the following steps of (1) cutting width, cutting length, sewing eye phase, cutting number, cutting arrangement mode and trapezoidal seam single-side angle;
c, checking the residual strength of the slotted liner pipe by a finite element analysis modeling method and combining the stratum collapse pressure according to the material of the slotted liner pipe and the slotted parameters of the slotted liner pipe, and judging whether the plastic deformation areas between adjacent slots are connected or not; if the plastic deformation areas between the adjacent slots are connected, repeating the step b;
d, if the plastic deformation areas between the adjacent slots are not connected, processing a slotted liner tube sample according to the material of the slotted liner tube and the slotted parameters of the slotted liner tube, performing a compression strength test on the slotted liner tube sample, and judging whether the compression strength of the slotted liner tube sample meets the requirement; if the anti-extrusion strength of the slotted liner test sample does not meet the requirement, repeating the step b;
step e, if the anti-extrusion strength of the slotted liner tube sample meets the requirement, performing an overcurrent test on the slotted liner tube sample, and judging whether the overcurrent capacity of the slotted liner tube meets the requirement; and if the overflowing capacity of the slotted liner does not meet the requirement, repeating the step b.
Further, the step a specifically includes:
acquiring the content of hydrogen sulfide and the content of carbon dioxide in a gas produced by a target gas well;
calculating the partial pressure of hydrogen sulfide and the partial pressure of carbon dioxide according to the content of hydrogen sulfide and the content of carbon dioxide;
and determining the material of the slotted liner according to the partial pressure of the hydrogen sulfide and the partial pressure of the carbon dioxide.
Further, in the step b, the slot width and the slot length are determined according to the granularity of sand grains and/or formation pollution residues.
Further, in the step b, the single-side angle of the trapezoidal seam is determined according to the analysis of the production allocation and erosion conditions of the target gas well.
In a second aspect, an embodiment of the present invention provides a corrosion-resistant alloy trapezoid slotted liner designed by the design method described in the first aspect of the embodiment of the present invention, wherein the slotted liner is used for a depth of 4500 m or more, a bottom pressure of 70MPa or more, a temperature of 150 ℃ or more, and a hydrogen sulfide content of 5g/m3Well completion for gas wells above and at a production rate of 20 ten thousand square per day;
the slotted liner comprises: the base pipe and the kerfs are distributed on the base pipe, and the section of each kerve is trapezoidal along the radial direction of the base pipe;
the length direction of the slot is parallel to the axial direction of the base pipe;
the width of the cutting seam is 0.5-1.5 mm, the length of the cutting seam is 55-65 mm, the number of the cutting seams is 3-20/m, the phase position of the sewing hole is 120 degrees, the single-side angle is 4-6 degrees, and the arrangement mode is spiral or staggered.
Further, when the logging of the target gas well is interpreted as a poor gas layer and the reservoir type is a pore type, the width of a slot of the slot is 1mm, the length of the slot is 60mm, the number of the slots is 11-15/m, the slot phase is 120 degrees, the single-side angle is 4 degrees, and the arrangement mode is a spiral type.
Further, when the logging of the target gas well is interpreted as a gas layer and a reservoir type is a cave-dissolving type and/or a crack type, the width of a slot of the slot is 1mm, the length of the slot is 60mm, the number of the slots is 16-20 slots/m, the phase position of a slot hole is 120 degrees, the single-side angle is 4 degrees, and the arrangement mode is a staggered mode.
Further, when the logging of the target gas well is interpreted as a dry layer, the width of the slots is 1mm, the length of the slots is 60mm, the number of the slots is 3-8/m, the slot phase is 120 degrees, the single-side angle is 4 degrees, and the arrangement mode is spiral.
The technical scheme provided by the embodiment of the invention has the beneficial effects that:
according to the design method provided by the embodiment of the invention, the residual strength of the slotted liner is checked by adopting a finite element analysis modeling method and combining the formation collapse pressure according to the characteristics of a deep high-temperature high-pressure high-acidity gas reservoir high-yield gas well, and whether the liner is integrally unstable is judged by judging whether the plastic deformation areas between adjacent slots are connected. Meanwhile, in the design method provided by the embodiment of the invention, the anti-extrusion capacity and the overflowing capacity of the slotted liner tube sample are also detected. Therefore, the slotted liner tube designed by the design method provided by the embodiment of the invention has enough anti-extrusion strength, can support the pressure after the well wall collapses, and ensures the integrity of the shaft; the shape of the slotted hole and the overflowing capacity of the slotted hole can ensure the passing capacity of a high-yield gas well, erosion cannot occur, shaft residues can be effectively blocked, the puncture probability of a ground flow is reduced, the normal production of the gas well is ensured, and the method has very important significance for efficiently developing deep high-temperature high-pressure high-acidity gas reservoirs.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flow chart of a method for designing a corrosion-resistant alloy trapezoidal slit liner according to an embodiment of the present invention;
FIG. 2 is a diagram illustrating an analysis of a corrosive environment;
FIG. 3 is a diagram of a slotted liner material selection;
FIG. 4 is a diagram of an apparatus for an overcurrent test; the reference numerals in the drawings denote: 1-square well, 2-blind plug, 3-slotted liner tube, 4-double male short section, 5-adapter and 6-skid pump.
FIG. 5 is a schematic structural diagram of a corrosion-resistant alloy slotted liner according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of another corrosion-resistant alloy trapezoid slotted liner according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions and advantages of the present invention clearer, the following will describe embodiments of the present invention in further detail with reference to the accompanying drawings. Unless defined otherwise, all technical terms used in the examples of the present invention have the same meaning as commonly understood by one of ordinary skill in the art.
The working environment of the deep high-temperature high-pressure high-acid gas reservoir high-yield gas well is obviously different from that of a common gas well, the temperature and the pressure are very high,complex structure of stratum and well bore, high output of single well, high content of hydrogen sulfide in produced gas, and strong corrosivity. The Xinjiang Dina 2, Clar 2, Sichuan Puguang, Yuan-Ba, Ro Jia Zi, Anyue and other gas fields in China are typical high-temperature and high-pressure gas reservoirs, and some gas reservoirs also have the characteristic of high sulfur content, such as the northeast China sea phase gas reservoir YB 1-side 1 well production layer vertical depth 7349.15m, the pressure of 68.71MPa, the temperature of 158.6 ℃, H2S content of 6.61%, CO2The content is 6.25%. For the gas field, perforation completion is mainly used at present, and the problems that the perforation cost is high, perforating bullets are compact in pore pressure, tail pipe cementing cement slurry has secondary damage to a production layer and the like exist in the perforation completion. Slotted liner completions can overcome the problems with perforated completions. However, the existing design method of the slotted liner tube mainly aims at the rectangular slotted liner tube which is used for shallowly buried sand production oil and gas reservoirs and is made of common carbon steel. For a deep high-temperature high-pressure high-acidity gas reservoir high-yield gas well, the slotted liner designed by the existing design method cannot solve the problems that a shaft is blocked by shaft pollution sediments, and the risk of puncture and leakage to the ground flow in the test and production process during the well completion and oil testing test period and the like.
Based on the design, the embodiment of the invention provides a design method suitable for designing a corrosion-resistant alloy trapezoidal slit liner tube for a deep high-temperature high-pressure high-acidity gas reservoir high-yield gas well, and also provides the corrosion-resistant alloy trapezoidal slit liner tube designed based on the design method.
The deep high-temperature high-pressure high-acid gas reservoir high-yield gas well related in the embodiment of the invention has the depth of more than 4500 m, the bottom pressure of more than 70MPa, the temperature of more than 150 ℃ and the hydrogen sulfide content of 5g/m3Above and gas wells producing more than 20 ten thousand squares per day.
The single-side angle of the trapezoidal seam in the embodiment of the invention is half of the included angle of two bevel edges of the trapezoidal seam.
In a first aspect, an embodiment of the present invention provides a design method of a corrosion-resistant alloy trapezoidal slit liner, and referring to fig. 1, the design method includes:
In the design method provided by the embodiment of the invention, the material and the slot parameters of the slot liner pipe are determined, and the residual strength of the slot liner pipe is checked according to the material and the slot parameters of the slot liner pipe. Compared with the existing strength checking method which analyzes through the pressure difference between the inside and the outside of the liner pipe or directly adopts the ground stress and considers that the liner pipe loses the integrity when the metal material yields, the embodiment of the invention adopts a finite element analysis modeling method and checks the residual strength of the slotted liner pipe by combining the stratum collapse pressure, and judges whether the liner pipe has integrity instability or not by judging whether the plastic deformation areas between adjacent slots are connected or not. If the plastic deformation areas between the adjacent slots are connected, the instability of the integrity of the slotted liner is indicated, and if the connection is not generated, the integrity of the slotted liner is still satisfied. The above-described intensity checking method is more practical,
meanwhile, in the method provided by the embodiment of the invention, the anti-extrusion strength and the overflowing capacity of the slotted liner pipe are also tested. In the tests of the three performances of the residual strength, the anti-extrusion strength and the overcurrent capacity, if any one of the performances can not meet the requirements, the slotting parameters of the slotted liner pipe need to be designed again until all the performances of the slotted liner pipe meet the requirements, and then the finally determined slotting parameters are used as actual parameters for field processing.
In conclusion, the slotted liner tube designed by the design method provided by the embodiment of the invention has enough anti-extrusion strength, can support the pressure after the well wall collapses, and ensures the integrity of the shaft; the shape of the slotted hole and the overflowing capacity of the slotted hole can ensure the passing capacity of a high-yield gas well, erosion cannot occur, shaft residues can be effectively blocked, the puncture probability of a ground flow is reduced, the normal production of the gas well is ensured, and the method has very important significance for efficiently developing deep high-temperature high-pressure high-acidity gas reservoirs.
Further, in the design method provided in the embodiment of the present invention, step 1 specifically includes:
and 11, acquiring the content of hydrogen sulfide and the content of carbon dioxide in the gas produced by the target gas well. The content of hydrogen sulfide and the content of carbon dioxide in the gas produced by the target gas well can be obtained by collecting the relevant geological data and engineering data of the target gas well, and the corrosion environment of the target gas well can be judged, as shown in fig. 2,
And 12, calculating the partial pressure of the hydrogen sulfide and the partial pressure of the carbon dioxide according to the content of the hydrogen sulfide and the content of the carbon dioxide.
And step 13, determining the material of the slotted liner according to the partial pressure of the hydrogen sulfide and the partial pressure of the carbon dioxide. Specifically, the liner material is selected for the environment by a material map as shown in FIG. 3. For example, when H2S partial pressure of 10-5～10- 4MPa、CO2Partial pressure of 10-5～10-2At MPa, materials such as J55, N80, P110, T95 and the like can be selected(ii) a When H is present2S partial pressure of 5 × 10-4～10-2MPa、CO2Partial pressure of 10-5～10-2Selecting sulfur-resistant materials such as L80, C90, C95, etc. under MPa, and H under2S partial pressure of 10-2～102MPa、CO2Partial pressure of 10-5～10-2When the pressure is MPa, high-sulfur-resistant materials such as SMC110, VM110SS and the like can be selected; when H is present2S partial pressure of 5 × 10-4～10-2MPa、CO2Partial pressure of 10-2～102In the case of MPa, a nickel-base alloy material such as 825, 925, G3, 718, 2550, C276, SM2535, SM2050 or SM2060 may be selected. One skilled in the art can also select the material of the slotted liner in conjunction with corrosion test evaluation.
Further, in the design method provided by the embodiment of the invention, in step 2, the width and length of the slot can be determined according to the granularity of sand and/or formation pollution residues. And analyzing and determining the unilateral angle of the trapezoidal seam according to the production allocation and erosion conditions of the target gas well. Wherein, the B eggs erosion model is preferably adopted for erosion condition analysis.
Further, in the design method provided by the embodiment of the invention, in step 4, a strength testing machine is used for testing the anti-extrusion strength of the slotted liner sample.
Further, in the design method provided by the embodiment of the present invention, in step 5, the test device shown in fig. 4 may be used to test the flow capacity of the slotted liner. Referring to fig. 4, the overcurrent test apparatus includes: skid-mounted pump 6, crossover sub 5, two public nipple joints 4, slot liner pipe 3 and blind stifled 2 that connect in order, wherein crossover sub 5, two public nipple joints 4, slot liner pipe 3 and blind stifled 2 setting are in square well 1.
It will be appreciated by those skilled in the art that in the crush resistance test and flow capacity test described above, the slotted liner used should be of a size consistent with the size of the slotted liner in the field. The experimental parameters should also be substantially identical to the parameters of the site operation. In the over-current test, the experimental liquid should be the liquid with the same performance as the liquid used in the field construction, so that the influence of different slotting parameters on over-current resistance in the yield increasing transformation construction process is truly reflected by using an indoor experiment.
In a second aspect, the embodiment of the present invention provides a corrosion-resistant alloy trapezoid slotted liner designed by the design method of the first aspect of the embodiment of the present invention. The slotted liner includes: the base pipe and the kerfs distributed on the base pipe and with trapezoidal cross sections along the radial direction of the base pipe. The length direction of the slot is parallel to the axial direction of the base pipe; the width of the cutting seam is 0.5-1.5 mm, the length of the cutting seam is 55-65 mm, the number of the cutting seams is 3-20/m, the phase position of the sewing hole is 120 degrees, the single-side angle is 4-6 degrees, and the arrangement mode is spiral or staggered.
It will be understood by those skilled in the art that the dimensions of the slotted liner substrate tube, including diameter, length, etc., should be selected based on the actual operating conditions, and embodiments of the present invention are not particularly limited.
The slotted liner tube processed by adopting the slotted parameters can meet the requirements of the depth of 4500 m or more, the bottom pressure of 70MPa or more, the temperature of 150 ℃ or more and the hydrogen sulfide content of 5g/m3Above and well conditions with a production of more than 20 ten thousand square per day.
The parameters of the slotted liner may be selected based on the well log interpretation and the reservoir type of the target gas well. For example:
when the log of the target gas well is interpreted as a poor gas zone and the reservoir type is pore type, the following slot parameters may be used: the width of the cutting seam is 1mm, the length of the cutting seam is 60mm, the number of the cutting seams is 11-15/m, the phase position of the sewing hole is 120 degrees, the single-side angle is 4 degrees, and the arrangement mode is spiral, as shown in figure 5. Wherein, the number of the slots can be 12/m, 13/m, 14/m and the like.
When the log of the target gas well is interpreted as being gas, reservoir type being cavern and/or fracture type, the following slot parameters may be employed: the width of the cutting seam is 1mm, the length of the cutting seam is 60mm, the number of the cutting seams is 16-20/m, the phase position of the sewing hole is 120 degrees, the single-side angle is 4 degrees, and the arrangement mode is a staggered mode, as shown in fig. 6. Wherein, the number of the slots can be 17/m, 18/m, 19/m and the like.
When the log of the target gas well is interpreted as a dry layer, the following slot parameters may be used: the width of the cutting seam is 1mm, the length of the cutting seam is 60mm, the number of the cutting seams is 3-8/m, the phase position of the sewing hole is 120 degrees, the single-side angle is 4 degrees, and the arrangement mode is spiral. Wherein, the number of the slots can be 4/m, 5/m, 6/m, 7/m and the like.
The design method provided by the embodiment of the invention is further described in detail below by taking a specific gas well as an example.
Example 1:
in the embodiment, one development well mx008-H1 in a certain gas field in Chongqing area is used as a research object to design a slotted liner tube suitable for the well, and the specific design method comprises the following steps:
The well formation pressure is 76.61MPa, the gas reservoir middle depth is 4610m, H2The S content is 0.47%, H is obtained by calculation2S partial pressure of 0.36MPa and CO2The content is 1.44 percent, and CO is obtained by calculation2The partial pressure is 1.103MPa, the corrosion is a severe corrosion environment, and as shown in figure 3, the nickel-based alloy is selected to meet the requirement of long-term safe production of the well.
According to reservoir logging interpretation results, the physical property distribution of the reservoir section of the well is relatively uniform, the lithology is carbonate rock, and the acidification scale is controlled at 520m3Discharge capacity of 5m3Permin, geological production 80 × 104m3And d, comprehensively considering lithological characteristics, yield improvement control parameters, single-well production allocation and erosion problems in the oil testing process, and completing well by adopting the axial parallel parameters of 1mm of slotted width, 60mm of slotted length, 13 slots/m of slotted quantity, 4-degree single-side trapezoidal slot, 120-degree phase angle spiral slot arrangement and slotted liner tube base tube in the length direction of the slotted.
103, checking the residual strength of the slotted liner by a finite element analysis modeling method and combining the formation collapse pressure according to the material of the slotted liner determined in the step 101 and the slotted parameters of the slotted liner determined in the step 102, and judging whether the slotted liner keeps the integrity or not by judging whether the plastic deformation areas between adjacent slots are connected or not.
And 104, processing the slotted liner sample according to the slotted parameters determined in the step 102, and testing the anti-extrusion strength of the slotted liner sample by adopting a strength testing machine.
And 105, testing the overflowing capacity of the slotted liner pipe sample by using the device shown in FIG. 4, wherein in an overflowing test, the experimental liquid is liquid with the same performance as the liquid used in field construction.
After completion of the well using the slot parameters determined in step 102, the well was stabilized at an oil pressure of 46.3MPa for a test production of 182.77 × 104m3And d, further proving that the slotted liner completion designed by the design method provided by the embodiment can meet the production requirements of the gas reservoir.
Example 2
In the embodiment, one development well mx008-H19 in a certain gas field in Chongqing area is used as a research object to design a slotted liner tube suitable for the well, and the specific design method comprises the following steps:
step 201, collecting drilling, logging and completion parameters of the well, calculating H2S and CO2And determining the material of the slotted liner according to the material chart shown in fig. 3.
The well formation pressure is 76.3MPa, the gas reservoir middle depth is 4631m, H2The S content is 0.56 percent, and H is obtained by calculation2S partial pressure of 0.427MPa, CO2The content is 1.61 percent, and CO is obtained by calculation2The partial pressure is 1.228MPa, the corrosion is a severe corrosion environment, and as shown in figure 3, the nickel-based alloy is selected to meet the requirement of long-term safe production of the well.
Step 202, determining slotting parameters of trapezoidal slotting on a slotted liner pipe, wherein the slotting parameters comprise: the width of the slot, the length of the slot, the phase position of the slot holes, the number of the slots, the arrangement mode of the slots, the single-side angle of the trapezoidal slot and the like.
According to reservoir logging interpretation results, the physical property distribution of the reservoir section is relatively uniform, the lithology is carbonate rock, and the acidification scale is controlled at 620m3Discharge capacity of 5m3Permin, geological production 80 × 104m3And d, comprehensively considering lithology characteristics, yield improvement control parameters, single well production allocation and erosion problems in the oil testing process, and considering the characteristic of reservoir distribution heterogeneity, wherein optimized slotting parameters are shown in tables 1 and 2.
TABLE 1 liner design parameters
In this embodiment, the length direction of the slot is parallel to the axial direction of the base pipe of the slotted liner.
TABLE 2 liner segment parameter design
And (3) testing the performance of the slotted liner pipe sample processed by the slotted parameters according to the testing method of the steps 103-105 in the embodiment 1, wherein the testing result shows that the slotted parameters meet the requirements of actual working conditions.
After the completion of the well by adopting the slotting parameters, the initial well logging has the pressure stability of 43.17MPa and the testing yield of 44.7 × 104m3D, after acidizing and transforming by adopting the completion parameters of the slotted liner matched with the reservoir, stably testing the yield 155.04 × 10 at the oil pressure of 43MPa4m3And d, the yield increase multiple ratio is 3.47, and the liner pipe seam distribution parameters optimized according to the reservoir characteristics are fully proved to be capable of meeting the production requirements of the gas reservoirs.
Example 3
In the embodiment, one development well mx008-17-X1 in a certain gas field in Chongqing area is used as a research object, and a slotted liner tube suitable for the well is designed, wherein the specific design method comprises the following steps:
301, collecting drilling, logging and completion parameters of the well, calculating H2S and CO2And determining the material of the slotted liner according to the material chart shown in fig. 3.
The well formation pressure is 74.7MPa, the depth of the middle part of the gas reservoir is 4591m, H2The S content is 0.53 percent, and H is obtained by calculation2S partial pressure of 0.356MPa, CO2The content is 1.71 percent, and CO is obtained by calculation2The partial pressure is 1.277MPa, the corrosion is a severe corrosion environment, and as shown in figure 3, the nickel-based alloy should be selected to meet the requirement of long-term safe production of the well.
Step 302, determining slotting parameters of trapezoidal slotting on the slotted liner, wherein the slotting parameters comprise: the width of the slot, the length of the slot, the phase position of the slot holes, the number of the slots, the arrangement mode of the slots, the single-side angle of the trapezoidal slot and the like.
According to reservoir logging interpretation results, the physical property distribution of the reservoir section is relatively uniform, the lithology is carbonate rock, and the acidification scale is controlled at 700m3Discharge capacity of 6m3Permin, geological production 120 × 104m3And d, comprehensively considering lithology characteristics, yield increase modification control parameters, single well production allocation and erosion problems in the oil testing process, wherein the optimized liner pipe parameters are shown in tables 3 and 4.
TABLE 3 liner design parameters
In this embodiment, the length direction of the slot is parallel to the axial direction of the base pipe of the slotted liner.
TABLE 4 liner segment parameter design
And (3) testing the performance of the slotted liner pipe sample processed by the slotted parameters according to the testing method of the steps 103-105 in the embodiment 1, wherein the testing result shows that the slotted parameters meet the requirements of actual working conditions.
The well stably tests the yield 227.07 × 10 at the oil pressure of 50.54MPa4m3And d, fully proving that the optimized liner pipe seam distribution parameters according to the reservoir characteristics can meet the production requirements of the gas reservoir.
In summary, the embodiment of the invention provides a design method suitable for a corrosion-resistant alloy trapezoid slotted liner for a deep high-yield gas well, the design method provided by the embodiment of the invention adopts formation collapse pressure to check, the liner strength check adopts a method of combining a finite element analysis method and an indoor test to determine the unilateral angle of a trapezoid slot of the slotted liner according to different formation characteristics, the liner is ensured to have better self-cleaning capability, the integral extrusion strength of the liner is improved, and the erosion resistance of a slotted hole is further improved. The method provided by the invention can effectively block the shaft residues, reduce the puncture probability of the ground flow and ensure the normal production of the gas well, has very important significance for efficiently developing deep high-temperature high-pressure high-acidity gas reservoirs, can effectively avoid the secondary damage of cement paste to the reservoir during the perforation completion process, can effectively block the residues in the stratum in the special slot form, and reduces the risk of the puncture of the ground pipeline during the oil testing process. Meanwhile, the corrosion-resistant alloy trapezoid slit slotted liner tube is adopted for well completion, so that the well completion cost can be obviously reduced, the well completion oil testing period is greatly shortened, and the method has obvious economic benefits and wide application prospects. The 6-well field test and application successfully carried out in the gas reservoir of the Mirabio group of Mirabio Lophanthus Moxi show that the average test yield is about 190 ten thousand square/day, the highest test yield reaches 227.07 ten thousand square/day, and the well completion cost is saved by nearly 1000 ten thousand yuan.
The above description is only for facilitating the understanding of the technical solutions of the present invention by those skilled in the art, and is not intended to limit the present invention. 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 (8)
1. A design method of a corrosion-resistant alloy trapezoid slit liner tube is characterized by comprising the following steps:
step a, determining the material of the slotted liner pipe;
step b, determining the slotting parameters of trapezoidal slotting on the slotting liner pipe, wherein the slotting parameters at least comprise: the method comprises the following steps of (1) cutting width, cutting length, sewing eye phase, cutting number, cutting arrangement mode and trapezoidal seam single-side angle;
c, checking the residual strength of the slotted liner pipe by a finite element analysis modeling method and combining the stratum collapse pressure according to the material of the slotted liner pipe and the slotted parameters of the slotted liner pipe, and judging whether the plastic deformation areas between adjacent slots are connected or not; if the plastic deformation areas between the adjacent slots are connected, repeating the step b;
d, if the plastic deformation areas between the adjacent slots are not connected, processing a slotted liner tube sample according to the material of the slotted liner tube and the slotted parameters of the slotted liner tube, performing a compression strength test on the slotted liner tube sample, and judging whether the compression strength of the slotted liner tube sample meets the requirement; if the anti-extrusion strength of the slotted liner test sample does not meet the requirement, repeating the step b;
step e, if the anti-extrusion strength of the slotted liner tube sample meets the requirement, performing an overcurrent test on the slotted liner tube sample, and judging whether the overcurrent capacity of the slotted liner tube meets the requirement; and if the overflowing capacity of the slotted liner does not meet the requirement, repeating the step b.
2. The design method according to claim 1, wherein step a specifically comprises:
acquiring the content of hydrogen sulfide and the content of carbon dioxide in a gas produced by a target gas well;
calculating the partial pressure of hydrogen sulfide and the partial pressure of carbon dioxide according to the content of hydrogen sulfide and the content of carbon dioxide;
and determining the material of the slotted liner according to the partial pressure of the hydrogen sulfide and the partial pressure of the carbon dioxide.
3. The design method according to claim 1, wherein in step b, the slot width and slot length are determined according to the granularity of sand and/or formation contamination residues.
4. The design method of claim 1, wherein in the step b, the single-edge angle of the trapezoidal seam is determined according to analysis of production allocation and erosion conditions of the target gas well.
5. The corrosion-resistant alloy trapezoid slotted liner tube designed by the design method of any one of claims 1 to 4, wherein the slotted liner tube is used for the depth of 4500 m or more, the bottom hole pressure of 70MPa or more, the temperature of 150 ℃ or more, and the hydrogen sulfide content of 5g/m3Well completion for gas wells above and at a production rate of 20 ten thousand square per day;
the slotted liner comprises: the base pipe and the kerfs are distributed on the base pipe, and the section of each kerve is trapezoidal along the radial direction of the base pipe;
the length direction of the slot is parallel to the axial direction of the base pipe;
the width of the cutting seam is 0.5-1.5 mm, the length of the cutting seam is 55-65 mm, the number of the cutting seams is 3-20/m, the phase position of the sewing hole is 120 degrees, the single-side angle is 4-6 degrees, and the arrangement mode is spiral or staggered.
6. The slotted liner according to claim 5, wherein when logging of a target gas well is interpreted as poor gas and the reservoir type is pore type, the slotted width of the slots is 1mm, the slot length is 60mm, the number of slots is 11-15/m, the slot phase is 120 degrees, the single-side angle is 4 degrees, and the arrangement mode is spiral.
7. The slotted liner according to claim 5, wherein when logging of a target gas well is interpreted as gas formation, reservoir type is cavern type and/or fracture type, the slotted width of the slotted liner is 1mm, the slotted length is 60mm, the number of slotted liners is 16-20/m, the slotted eye phase is 120 degrees, the single-side angle is 4 degrees, and the arrangement mode is staggered.
8. The slotted liner according to claim 5, wherein when the log of the target gas well is interpreted as dry layer, the slot width of the slots is 1mm, the slot length is 60mm, the number of slots is 3-8 slots/m, the slot phase is 120 °, the single side angle is 4 °, and the arrangement is spiral.
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| CN102465671A (en) * | 2010-11-18 | 2012-05-23 | 常萍 | Triaxial stress strength designing method for vertical well casing string |
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| 割缝筛管抗挤压强度综合因素有限元分析;杨晓东等;《石油钻采工艺》;20091031;第31卷(第5期) * |
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