CN111852410A - Offshore gas well multi-production-channel well completion pipe string structure and well completion process method - Google Patents

Offshore gas well multi-production-channel well completion pipe string structure and well completion process method Download PDF

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Publication number
CN111852410A
CN111852410A CN202010809255.8A CN202010809255A CN111852410A CN 111852410 A CN111852410 A CN 111852410A CN 202010809255 A CN202010809255 A CN 202010809255A CN 111852410 A CN111852410 A CN 111852410A
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production
string
channel
gas well
production string
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许发宾
阚长宾
于晓聪
马勇新
成涛
陈力
杨仲涵
刘鹏超
刘贤玉
徐靖
王闯
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CNOOC China Ltd Zhanjiang Branch
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/01—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells specially adapted for obtaining from underwater installations
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B34/00—Valve arrangements for boreholes or wells
    • E21B34/06—Valve arrangements for boreholes or wells in wells

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Abstract

The invention discloses a multi-production channel well completion pipe string structure of an offshore gas well and a well completion process method, belonging to the technical field of oil and gas exploitation, wherein the well completion pipe string structure comprises the following components: the inner layer production pipe column comprises an upper inner layer production pipe column and a lower inner layer production pipe column which are coaxially connected up and down; the outer production string is sleeved outside the inner production string, an annular passage is formed between the outer production string and the inner production string, and the outer production string comprises an upper outer production string and a lower outer production string which are coaxially connected up and down; the concentric underground safety valve is used for connecting an upper inner production pipe column with a lower inner production pipe column and simultaneously connecting an upper outer production pipe column with a lower outer production pipe column, and can control the opening and closing of a passage of the inner production pipe column and the opening and closing of an annular passage. The invention can select different channels according to the productivity of the gas well so as to adjust and optimize the development scheme.

Description

Offshore gas well multi-production-channel well completion pipe string structure and well completion process method
Technical Field
The invention relates to the technical field of oil and gas exploitation, in particular to a well completion pipe string structure with multiple production channels for an offshore gas well and a well completion process method.
Background
Offshore natural gas fields are important production areas for natural gas.
Gas wells are developed for years, the problems in the development of the gas wells are increasingly obvious, particularly in some old gas fields, the producible gas quantity of the gas wells is gradually reduced along with the increase of the exploitation age, and the actual productivity of the gas wells is gradually reduced.
However, in the prior art, after completion construction is completed, the sectional area of a channel is kept unchanged, so that the method cannot adapt to later exploitation of a gas well.
Disclosure of Invention
The invention aims to provide a multi-production-channel well completion pipe string structure of an offshore gas well and a well completion process method.
As the conception, the technical scheme adopted by the invention is as follows:
an offshore gas well multi-production passage completion string structure comprising:
the inner layer production pipe column comprises an upper inner layer production pipe column and a lower inner layer production pipe column which are coaxially connected up and down;
the outer production pipe column is sleeved outside the inner production pipe column, an annular passage is formed between the outer production pipe column and the inner production pipe column, and the outer production pipe column comprises an upper outer production pipe column and a lower outer production pipe column which are coaxially connected up and down;
the concentric underground safety valve is used for connecting the upper inner layer production string with the lower inner layer production string and simultaneously connecting the upper outer layer production string with the lower outer layer production string, and can control the opening and closing of a passage of the inner layer production string and the opening and closing of an annular passage.
Optionally, the concentric downhole safety valve comprises:
the inner pipe column production channel control flashboard can control the opening and closing of the channel of the inner production pipe column; and an annulus passage control shutter capable of controlling opening and closing of the annulus passage.
Optionally, the concentric downhole safety valve further comprises an insertion seal sub and a downhole safety valve inner string, the insertion seal sub being connected with the downhole safety valve inner string for sealing the inner production string.
Optionally, the lower outer production string comprises a production packer, and a basket shear sliding sleeve is arranged at the lower end of the lower outer production string and used for well completion setting of the production packer.
Optionally, the upper inner production string and the lower inner production string can be communicated to form an inner tubular string production channel, and the critical yield of the inner tubular string production channel is calculated by:
Figure BDA0002630324400000021
wherein Q isgcIs qiWell critical production in 108m3/d；rpiIs the radius of the inner wall of the inner production string, in m; p is pressure in MPa; k is a radical ofpiA correction factor for the production channel being the inner tube string production channel; t is temperature in K; z is a gas deviation factor under the temperature and pressure conditions of p and T; rhoLIs the density of the liquid in kg/m3；ρgGas phase density of gas well produced fluid, unit is kg/m 3; g is the acceleration of gravity with the unit of m/s 2; sigma is gas-liquid surface tension, and the unit is N/m; cDThe drag coefficient is zero dimension.
Optionally, the annular passage may form an annular production passage, and the method for calculating the critical yield of the annular production passage includes:
Figure BDA0002630324400000031
wherein Q isgcIs the critical production of gas well and has a unit of 108m3/d；rpoThe radius of the inner wall of the outer production string is m; r ispioThe radius of the outer wall of the inner production string is m; p is pressure in MPa; k is a radical ofpauA correction factor for the production channel being the annulus channel; t is temperature in K; z is a gas deviation factor under the temperature and pressure conditions of p and T; rhoLIs the density of the liquid in kg/m3；ρgGas phase density of gas well produced fluid in kg/m3(ii) a g is the acceleration of gravity in m/s2(ii) a Sigma is gas-liquid surface tension, and the unit is N/m; cDThe drag coefficient is zero dimension.
Optionally, the upper inner production string and the lower inner production string are communicated, the annular passage is opened, an all-pass production passage can be formed, and the critical yield of the all-pass production passage is calculated by:
Figure BDA0002630324400000032
wherein Q isgcIs the critical production of gas well and has a unit of 108m3/d；rpoThe radius of the inner wall of the outer production string is m; r ispioThe radius of the outer wall of the inner production string is m; p is pressure in MPa; kp is a correction coefficient of the production channel being the all-pass production channel; t is temperature in K; z is a gas deviation factor under the temperature and pressure conditions of p and T; rhoLIs the density of the liquid in kg/m3；ρgGas phase density of gas well produced fluid in kg/m3(ii) a g is the acceleration of gravity with the unit of m/s 2; sigma is gas-liquid surface tension, and the unit is N/m; cDThe drag coefficient is zero dimension.
Optionally, the flow cross-sectional area at the concentric downhole safety valve is constant, and the flow cross-sectional area at the plug-in seal sub is constant.
Optionally, the lower outer production string comprises a production packer, and the lower end of the lower outer production string is provided with a downhole pressure tapping device for completion setting of the production packer.
A well completion process method is used for carrying out construction and installation on the offshore gas well multi-production-channel well completion pipe column structure, and comprises the following steps:
s1, completing drilling of the gas well to the designed depth;
s2, running the lower outer layer production pipe column to the designed depth;
s3, running a lower inner layer production pipe column;
s4, installing a concentric underground safety valve;
s5, running an upper outer layer production pipe column;
and S6, running the upper inner layer production string.
According to the multi-production-channel well completion pipe string structure of the offshore gas well, the concentric underground safety valve controls the opening of the channel of the inner-layer production pipe string and the closing of the annular channel to form the inner-pipe string production channel; the concentric underground safety valve controls the passage of the inner production string to be closed and the annular passage to be opened, so that an annular production passage is formed; the concentric subsurface safety valve controls the simultaneous opening of the inner production string passage and the annular passage to form a full-through production passage. In actual operation, a production channel actually required by the gas well is selected according to the actual production requirement, the production allocation condition and the production sand and water production conditions of the gas well. The problem of high well repair operation cost caused by well repair in the production process is avoided.
The well completion process method provided by the invention is used for realizing the construction and installation of the offshore gas well multi-production-channel well completion pipe column structure, so that in actual operation, a production channel actually required by a gas well can be selected according to the actual production requirement, the production allocation condition and the production sand and water production conditions of the gas well.
Drawings
FIG. 1 is a schematic diagram of an offshore gas well multi-production passage completion string configuration provided by an embodiment of the present invention;
FIG. 2 is a schematic diagram of an offshore gas well multi-production passage completion string configuration provided by a second embodiment of the invention.
In the figure:
11. an upper inner production string; 12. a lower inner production string;
21. an upper outer production string; 22. a lower outer production string; 221. producing a packer;
3. a concentric downhole safety valve; 31. inserting a sealing short section;
4. a relief valve pilot operated line;
5. a sand prevention packer;
6. an annulus passageway;
71. a blind pipe; 72. gas well open hole; 73. a screen pipe;
81. shearing a sliding sleeve with a basketball basket; 82. a downhole pressure tapping device; 83. a ball seat.
Detailed Description
In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.
In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example one
Referring to fig. 1, the embodiment provides a completion pipe string structure for multiple production channels of an offshore gas well, which has a function of adjusting multiple production channels, and can meet requirements of adjusting a production system in a gas well exploitation process, treating accumulated liquid in a gas well shaft without moving a pipe string, and safely shutting off abnormal conditions of multiple production channels. Meanwhile, the offshore construction pipe column has the advantages of simple structure, safe and efficient offshore construction operation, low construction risk, low construction operation cost and the like.
Specifically, in the present embodiment, the offshore gas well multi-production passage completion string structure includes an inner production string, an outer production string, and a concentric downhole safety valve 3.
Wherein, the inner layer production string comprises an upper inner layer production string 11 and a lower inner layer production string 12 which are coaxially connected up and down. Outside the inlayer production string was located to outer production string cover, annular space passageway 6 had between outer production string and the inlayer production string, outer production string includes coaxial outer production string 21 in upper portion and the outer production string 22 in lower part that links to each other from top to bottom.
Concentric formula downhole safety valve 3 is connected upper portion inlayer production string 11 and lower part inlayer production string 12, connects upper portion outer production string 21 and lower part outer production string 22 simultaneously, and concentric formula downhole safety valve 3 can control the switching of the passageway of inlayer production string, can also control the switching of annular space passageway 6.
Specifically, in the present embodiment, the annulus passage 6 includes an upper annulus passage and a lower annulus passage; the outer wall of the upper inner production string 11 and the inner wall of the upper outer production string 21 form an upper annulus passage; the outer wall of the lower inner production string 12 and the inner wall of the lower outer production string 22 form a lower annulus passageway.
By adopting the multi-production-channel well completion pipe string structure of the offshore gas well, the concentric downhole safety valve 3 controls the inner-layer production pipe string to open when the channel of the inner-layer production pipe string is opened and the annular channel 6 is closed, so that an inner-pipe string production channel is formed; the concentric underground safety valve 3 controls the passage of the inner production string to be closed and the annular passage 6 to be opened to form an annular production passage; the concentric subsurface safety valve 3 controls the simultaneous opening of the inner production string passageway and the annulus passageway 6 to form a full production passageway.
In the production process of the offshore gas well, a production channel actually required by the gas well is selected according to the actual production requirement, the production allocation condition and the production sand and water producing conditions of the gas well.
The concentric underground safety valve 3 can meet the technical requirements of underground safety control of offshore gas wells. When the gas well encounters abnormal production conditions (typhoon, earthquake, explosion, platform fire and the like), the underground safety control device can rapidly close the inner pipe string production channel and the annular production channel so as to ensure the production safety of the offshore gas well and the safety of a wellhead platform.
Specifically, in the present embodiment, the concentric downhole safety valve 3 includes an inner tubular string production passage control shutter and an annulus passage control shutter. The inner pipe column production channel control flashboard can control the opening and closing of the channel of the inner production pipe column; the annulus passage control shutter can control opening and closing of the annulus passage 6.
Specifically, in the present embodiment, the inner tubular string production passage control shutter is capable of controlling whether the upper inner production string 11 and the lower inner production string 12 are communicated; the annular passage control shutter is capable of communicating between the upper annular passage and the lower annular passage.
Further, in this embodiment, concentric type downhole safety valve 3 still includes to insert sealed nipple 31 and downhole safety valve inlayer tubular column, inserts sealed nipple 31 and is connected with downhole safety valve inlayer tubular column for sealed inlayer production tubular column.
By arranging the inserting sealing nipple 31, the inner-layer tubular column production channel and the annular production channel can be respectively controlled. When one production channel is selected, the other production channel is closed to ensure that the wellhead of the production channel which is not started is not pressurized. No matter which production channel is used for production, when an abnormal production condition is met, the concentric type downhole safety valve 3 can rapidly close the inner-layer tubular column production channel and the annular production channel, and the technical requirement of offshore well control is met.
Further, in this embodiment, the lower outer production string 22 includes a production packer 221, and the lower end of the lower outer production string 22 is provided with a basket shear sleeve 81, and the basket shear sleeve 81 is used for completion setting of the production packer 221.
Specifically, in this embodiment, the lower outer production string 22 includes a mandrel and a production packer 221
Specifically, in this embodiment, the inner tubular string production passage is formed when the inner tubular strings of the upper inner production string 11 and the lower inner production string 12 are communicated, the annular production passage is formed when the upper annular passage and the lower annular passage of the annular passage 6 are communicated, and the upper inner production string 11 and the lower inner production string 12 are communicated and the annular passage 6 is opened, so that the all-through production passage can be formed.
Preferably, the flow cross-sectional area at the concentric downhole safety valve 3 is constant, and the flow cross-sectional area at the insertion seal nipple 31 is constant, so that each production channel has no reduction in diameter, and the gas flow is prevented from being blocked when flowing in the production channel.
Specifically, in this embodiment, the method for calculating the critical production of the inner tubular string production channel includes:
Figure BDA0002630324400000081
wherein Q isgcIs the critical production of gas well and has a unit of 108m3/d；rpiIs the radius of the inner wall of the inner production string, in m; p is pressure in MPa; k is a radical ofpiA correction coefficient of the production channel being an inner pipe string production channel; t is temperature in K; z is a gas deviation factor under the temperature and pressure conditions of p and T; rhoLIs the density of the liquid in kg/m3；ρgGas phase density of gas well produced fluid, unit is kg/m 3; g is the acceleration of gravity with the unit of m/s 2; sigma is gas-liquid surface tension, and the unit is N/m; cDThe drag coefficient is zero dimension.
Specifically, in this embodiment, the method for calculating the critical output of the annulus production channel includes:
Figure BDA0002630324400000091
wherein Q isgcIs the critical production of gas well and has a unit of 108m3/d；rpoThe radius of the inner wall of the outer production string is m; r ispioThe radius of the outer wall of the inner production string is m; p is pressure in MPa; k is a radical ofpauA correction factor for the production channel being the annulus channel 6; t is temperature in K; z is a gas deviation factor under the temperature and pressure conditions of p and T; rhoLIs the density of the liquid in kg/m3；ρgGas phase density of gas well produced fluid in kg/m3(ii) a g is the acceleration of gravity in m/s2(ii) a σ is the gas-liquid surface tension inN/m；CDThe drag coefficient is zero dimension.
Specifically, in this embodiment, the method for calculating the critical yield of the all-pass production channel includes:
Figure BDA0002630324400000092
wherein Q isgcIs the critical production of gas well and has a unit of 108m3/d；rpoThe radius of the inner wall of the outer production string is m; r ispioThe radius of the outer wall of the inner production string is m; p is pressure in MPa; kp is a correction coefficient of the production channel being an all-pass production channel; t is temperature in K; z is a gas deviation factor under the temperature and pressure conditions of p and T; rhoLIs the density of the liquid in kg/m3；ρgGas phase density of gas well produced fluid in kg/m3(ii) a g is the acceleration of gravity with the unit of m/s 2; sigma is gas-liquid surface tension, and the unit is N/m; cDThe drag coefficient is zero dimension.
In normal production of a gas well, selecting an actual production channel according to actual production needs of the gas well, wherein the general principle of production channel selection is as follows: when the gas well yield is low, a production channel with lower critical yield is selected; and selecting a production channel with high critical yield when the yield is high.
Specifically, in this embodiment, the upper inner production string 11 and the upper outer production string 21 form an upper concentric dual tubing, and the lower inner production string 12 and the lower outer production string 22 form a lower concentric dual tubing.
Specifically, in the present embodiment, the upper end of the concentric downhole safety valve 3 is connected to the upper concentric double tubing, and the lower end of the concentric downhole safety valve 3 is connected to the lower concentric double tubing.
It should be noted that the upper inner production string 11 and the lower inner production string 12 form an inner production tubing string production passage, which is required to meet the safety passing requirement of the tripping operation of the production logging tool. The design of the passability of the inner pipe of the concentric type downhole safety valve 3 is carried out by adopting a passability design method of an inner pipe production channel.
In the later stage of gas well production, one production channel can be selected for production, and the other production channel can be used as a wellhead injection channel for foam discharging agent injection or high-pressure gas lift injection so as to meet the requirements of gas well composite discharging and production and assist in production of the gas well.
Further, in this embodiment, the lower outer production string 22 includes a mandrel and a production packer 221 disposed outside the mandrel.
Furthermore, the offshore gas well multi-production-channel completion pipe column structure further comprises a safety valve hydraulic control pipeline 4, and the safety valve hydraulic control pipeline 4 is connected with the upper outer-layer production pipe column 21 in a binding mode.
Further, in this embodiment, the offshore gas well multi-production passage completion string structure further comprises a blind 71 and a screen 73.
The offshore gas well multi-production-channel well completion pipe string structure provided by the embodiment can meet the actual production requirements of multiple production channels in the production process of an offshore gas well, and can timely adjust the production channel of the gas well according to the actual productivity of the gas well so as to solve the problem of shaft liquid carrying in the later production stage of the gas well. Meanwhile, the adjustment of shaft effusion treatment measures meeting the conditions of a fixed pipe column in the later production stage of the offshore gas well can be realized, and the accumulated liquid treatment measures such as foam drainage, combined gas lift and the like can be met.
Example two
Referring to fig. 2, the present embodiment provides an offshore gas well multi-production passage completion string structure, which is different from the first embodiment in that a downhole pressure tapping device 82 is used for well completion setting of a production packer 221 instead of the basket shear sleeve 81 in the first embodiment, and the downhole pressure tapping device 82 is used for well completion setting.
Further, in this embodiment, a ball seat 83 is further provided at the lower end of the lower pressure tapping device 82.
EXAMPLE III
The embodiment provides a completion process method for constructing and installing an offshore gas well multi-production-channel completion pipe string structure in the first embodiment or the second embodiment, which comprises the following steps of:
s1, completing drilling of the gas well open hole 72 to the designed depth;
specifically, after step S1 is completed, the following operations are also required: and (4) putting the sand control pipe assembly, and performing gravel packing operation and sand control packer 5 setting sealing operation. Specifically, the sand control pipe combination includes a blind pipe and a screen pipe.
S2, running the lower outer production string 22 to the designed depth;
specifically, in step S2, a well-clearing operation, a well-flushing operation, multiple passes are performed to ensure cleanliness in the gas well bore, followed by running the lower outer production string 22 to the design depth.
Specifically, in step S2, the lower outer production string 22 includes a mandrel and a production packer 221, and optionally, a guide head and a flanged shear sleeve are provided at the end of the mandrel. The shear sleeve with the ball flange can meet the well completion setting of the production packer 221.
Of course, the downhole pressure perforating device 82 may also be used to satisfy the completion setting of the production packer 221.
Further, in step S2, after the lower outer production string 22 is lowered to the design depth, the wellhead is temporarily landed.
S3, running the lower inner production string 12;
specifically, in step S3, the lower inner production string 12 is run into the lower outer production string 22 and disposed coaxially therewith.
S4, installing a concentric underground safety valve 3;
specifically, in step S4, the concentric downhole safety valve 3 is provided with an insert seal sub 31 to seal the inner production string. The concentric subsurface safety valve 3 is first connected to the lower inner production string 12, then the lower outer production string 22 is unset, and the concentric subsurface safety valve 3 is connected to the lower outer production string 22.
S5, running the upper outer layer production string 21;
specifically, in step S5, the offshore gas well multi-production-passage completion string structure further includes a safety valve hydraulic control line 4, and when the upper outer production string 21 is run in, the safety valve hydraulic control line 4 is bound to the upper outer production string 21, so that the safety valve hydraulic control line 4 is run in along with the upper outer production string 21.
Further, in step S5, when the upper outer production string 21 is lowered to the design depth, a seal is inserted into the lower end mandrel of the upper outer production string 21; and then, carrying out wellhead suspension sealing on an outer production oil pipe of the outer production pipe column, locating on the large four-way joint at the lower part of the gas production tree, and connecting a wellhead annulus production channel.
S6, running the upper inner layer production string 11;
specifically, in step S6, the upper inner production string 11 is lowered into the upper outer production string 21 so as to be disposed coaxially therewith; running the upper inner production string 11 to a design depth; subsequently, the upper inner production string 11 is subjected to an insertion sealing operation; and (3) carrying out wellhead suspension sealing on the inner production tubing of the inner production tubing string, locating on the upper four-way of the gas production tree, and connecting the inner tubing string production channel.
And S7, installing a wellhead gas production tree, connecting the production process and testing the pressure.
S8, performing hydraulic setting on the production packer 221, and after setting, pressing and shearing the shear sleeve to the ball basket.
The foregoing embodiments are merely illustrative of the principles and features of this invention, which is not limited to the above-described embodiments, but rather is susceptible to various changes and modifications without departing from the spirit and scope of the invention, which changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (10)

1. An offshore gas well multi-production passage completion string structure, comprising:
the inner layer production string comprises an upper inner layer production string (11) and a lower inner layer production string (12) which are coaxially connected up and down;
the outer production string is sleeved outside the inner production string, an annular passage (6) is formed between the outer production string and the inner production string, and the outer production string comprises an upper outer production string (21) and a lower outer production string (22) which are coaxially connected up and down;
and the concentric downhole safety valve (3) is used for connecting the upper inner production string (11) and the lower inner production string (12) and simultaneously connecting the upper outer production string (21) and the lower outer production string (22), and the concentric downhole safety valve (3) can be used for controlling the opening and closing of the passage of the inner production string and also controlling the opening and closing of the annular passage (6).
2. Offshore gas well multi-production passage completion string structure according to claim 1, characterized in that the concentric downhole safety valve (3) comprises:
the inner pipe column production channel control flashboard can control the opening and closing of the channel of the inner production pipe column; an annulus passage control shutter capable of controlling opening and closing of the annulus passage (6).
3. Offshore gas well multi-production channel completion string structure according to claim 1, characterized in that the concentric downhole safety valve (3) further comprises a stinger seal sub (31) and a downhole safety valve inner string, the stinger seal sub (31) being connected to the downhole safety valve inner string for sealing the inner production string.
4. Offshore gas well multi-production channel completion string structure according to claim 1, characterized in that the lower outer production string (22) comprises a production packer (221), and the lower end of the lower outer production string (22) is provided with a basket shear sleeve (81), the basket shear sleeve (81) being used for completion setting of the production packer (221).
5. Offshore gas well multi-production channel completion string structure according to claim 1, characterized in that the upper inner production string (11) and the lower inner production string (12) are connectable to form an inner production channel, the critical production of which is calculated by:
Figure FDA0002630324390000021
wherein Q isgcIs the critical production of gas well and has a unit of 108m3/d；rpiIs the radius of the inner wall of the inner production string, in m; p is pressure in MPa; k is a radical ofpiA correction factor for the production channel being the inner tube string production channel; t is temperature in K; z is a gas deviation factor under the temperature and pressure conditions of p and T; rhoLIs the density of the liquid in kg/m3；ρgGas phase density of gas well produced fluid, unit is kg/m 3; g is the acceleration of gravity with the unit of m/s 2; sigma is gas-liquid surface tension, and the unit is N/m; cDThe drag coefficient is zero dimension.
6. Offshore gas well multi-production passage completion string structure according to claim 1, characterized in that the annular passage (6) is capable of forming an annular production passage, the critical production of which is calculated by:
Figure FDA0002630324390000022
wherein Q isgcIs the critical production of gas well and has a unit of 108m3/d；rpoThe radius of the inner wall of the outer production string is m; r ispioThe radius of the outer wall of the inner production string is m; p is pressure in MPa; k is a radical ofpau-a correction factor for the production channel being the annulus channel (6); t is temperature in K; z is a gas deviation factor under the temperature and pressure conditions of p and T; rhoLIs the density of the liquid in kg/m3；ρgGas phase density of gas well produced fluid in kg/m3(ii) a g is the acceleration of gravity in m/s2(ii) a Sigma is gas-liquid surface tension, and the unit is N/m; cDThe drag coefficient is zero dimension.
7. Offshore gas well multi-production passage completion string structure according to claim 1, characterized in that the upper inner production string (11) and the lower inner production string (12) are in communication and the annular passage (6) is open, enabling an all-through production passage to be formed, the critical production of which is calculated by:
Figure FDA0002630324390000031
wherein Q isgcIs the critical production of gas well and has a unit of 108m3/d；rpoThe radius of the inner wall of the outer production string is m; r ispioThe radius of the outer wall of the inner production string is m; p is pressure in MPa; kp is a correction coefficient of the production channel being the all-pass production channel; t is temperature in K; z is a gas deviation factor under the temperature and pressure conditions of p and T; rhoLIs the density of the liquid in kg/m3；ρgGas phase density of gas well produced fluid in kg/m3(ii) a g is the acceleration of gravity with the unit of m/s 2; sigma is gas-liquid surface tension, and the unit is N/m; cDThe drag coefficient is zero dimension.
8. Offshore gas well multi-production channel completion string structure according to claim 3, characterized in that the flow cross-sectional area at the concentric downhole safety valve (3) is constant and the flow cross-sectional area at the plug-in seal nipple (31) is constant.
9. Offshore gas well multi-production channel completion string structure according to claim 1, characterized in that the lower outer production string (22) comprises a production packer (221), the lower end of the lower outer production string (22) being provided with a downhole pressure tapping device (82), the downhole pressure tapping device (82) being used for completion setting of the production packer (221).
10. A completion process for the construction installation of a completion string structure according to any one of claims 1 to 9, comprising the steps of:
s1, completing drilling of the gas well open hole (72) to the designed depth;
s2, running the lower outer layer production string (22) to the designed depth;
s3, running a lower inner layer production string (12);
s4, installing a concentric underground safety valve (3);
s5, running an upper outer layer production pipe column (21);
and S6, running the upper inner layer production string (11).
CN202010809255.8A 2020-08-12 2020-08-12 Offshore gas well multi-production-channel well completion pipe string structure and well completion process method Pending CN111852410A (en)

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