Fish bone well completion, construction method and application

Abstract

The invention provides a fishbone well completion, a construction method and application, and belongs to the technical field of oil and gas field development. The fishbone well completion comprises the following steps: casing; the outer-layer oil pipe is arranged in the sleeve, the bottom of the outer-layer oil pipe is a plugging opening, and the outer-layer oil pipe is sequentially provided with a needle tube and an orifice from bottom to top; the inner-layer oil pipe is arranged in the outer-layer oil pipe, the lower portion of the inner-layer oil pipe is connected with a packer, and the position of the packer is lower than that of an orifice of the outer-layer oil pipe. According to the technology, an inner-layer oil pipe structure and an outer-layer oil pipe structure are utilized, a circulation channel is formed after the inner-layer oil pipe is set, the inner-layer oil pipe presses and drives a needle tube to conduct jet drilling, annular circulation gas of a sleeve and an outer-layer oil pipe lifts rock debris return liquid, annular circulation gas injection is conducted through an oil sleeve, annular pressure is reduced, and stratum return liquid is discharged in time through the oil sleeve annular space; jet flow construction pressure can be reduced, the submerged jet flow spraying effect is improved, meanwhile, liquid is returned in time, and a reservoir is protected against pollution.

Description

Technical Field

[0001] The invention belongs to the technical field of oil and gas field development, and in particular relates to a herringbone well completion, a construction method and an application thereof. Background Art

[0002] The multi-branch herringbone well technology is a process for increasing the production of oil layers. It uses a small-diameter flexible pipe to achieve steering in the casing or open hole and drills in the reservoir by high-pressure hydraulic rock breaking. It is a new drilling and completion technology for the purpose of liberating the reservoir under the premise of safe drilling and reservoir protection. This technology can directional drill multiple directional wellbores with a length of up to 10m in different directions of the oil layer to achieve the connection between the wellbore and the reservoir. Through the "parallel drilling" method, multiple branches are formed in the reservoir to increase the drainage area of ​​the reservoir, thereby achieving the purpose of increasing crude oil production.

[0003] Chinese patent publication CN105443085A discloses an oil and gas production device and method, which utilizes multi-branch herringbone well technology to achieve reservoir transformation and increase oil and gas production. The device includes a jet nipple and an adjustment nipple connected to the jet nipple, wherein a through mounting hole is provided on the side wall of the jet nipple, and an inner cavity oil hole for oil and gas to flow from the formation into production is provided on the adjustment nipple. In the initial state, the needle tube is installed in the inner cavity of the jet nipple, and in the process of pumping liquid into the jet nipple, the needle tube extends in the formation to form a production channel. This invention uses a ground high-pressure pump truck to pump high-pressure liquid into the oil pipe, and the high-pressure liquid drills forward through the self-propelled nozzle on the needle tube. First of all, this method belongs to submerged jet. The higher the environmental pressure (back pressure), the lower the rock breaking efficiency and the more difficult the drilling. Secondly, for low-pressure reservoirs, the drilling pressure is higher than the formation pressure, and the liquid will leak into the formation, making it difficult for the broken rock cuttings to return, causing rock cuttings to accumulate and affecting the drilling construction. At the same time, during the positive pressure drilling process, liquid leakage can easily cause reservoir pollution, which seriously affects the production increase effect for sensitive formations. Summary of the invention

[0004] The purpose of the present invention is to solve the difficulties existing in the above-mentioned prior art and provide a herringbone completion, construction method and application, which utilizes the oil casing annulus circulation gas injection to reduce the annulus pressure and allow the formation return fluid to be discharged in time through the oil casing annulus. This method can not only reduce the jet construction pressure and improve the submerged jet injection effect, but also return fluid in time to protect the reservoir from pollution.

[0005] The present invention is achieved through the following technical solutions:

[0006] A first aspect of the present invention provides a herringbone completion, comprising:

[0007] casing;

[0008] An outer oil pipe is arranged in the casing, the bottom of the outer oil pipe is a plug, and the outer oil pipe is provided with a needle tube and an orifice in sequence from bottom to top;

[0009] The inner layer oil pipe is arranged in the outer layer oil pipe, the lower part of the inner layer oil pipe is connected to a packer, and the position of the packer is lower than the position of the orifice of the outer layer oil pipe.

[0010] A further improvement of the present invention is:

[0011] There are 16 to 20 needle tubes arranged on the outer oil tube; preferably, there are 4 to 5 needle tubes arranged on the outer oil tube along the axial direction, and 4 needle tubes are evenly arranged on the radial section of the outer oil tube.

[0012] A further improvement of the present invention is:

[0013] The side wall of the outer oil pipe is provided with a penetrating mounting hole, and the eyelet slideway is arranged in the mounting hole;

[0014] One end of the needle tube is inserted into the hole slideway and a self-feeding nozzle is arranged at the end thereof, and the other end of the needle tube is located in the inner cavity of the outer oil pipe.

[0015] A further improvement of the present invention is:

[0016] The self-propelled nozzle includes a shell, which is a trumpet-shaped structure. The end of the shell with a small opening is connected to the end of the needle tube, and a backward nozzle is arranged inside the end of the shell with a small opening, and a forward nozzle is arranged inside the end of the shell with a large opening.

[0017] A further improvement of the present invention is:

[0018] The backward nozzle is inclined from the side wall of the shell toward the axial direction, and the angle between the nozzle and the axial direction of the shell is 30-45°; and / or,

[0019] The forward nozzle is parallel to the axial direction of the shell.

[0020] A further improvement of the present invention is:

[0021] The outer oil pipe is provided with a plurality of holes, and the plurality of holes are evenly distributed along the circumferential direction on the outer oil pipe.

[0022] A further improvement of the present invention is:

[0023] The position of the orifice on the outer oil pipe is as low as possible and close to the position of the eyelet slideway.

[0024] A further improvement of the present invention is:

[0025] The orifice position needs to be calculated in combination with the specific wellbore pressure distribution.开口 The calculation formula is as follows:

[0026] HP 地层 / ρg≤H 开口 ≤H

[0027] Where, H is the well depth at the hole slide, MPa;

[0028] P 地层 is the formation pressure, MPa;

[0029] ρ is the wellbore fluid density, kg / m 3 ;

[0030] g is the acceleration due to gravity, m / s 2 .

[0031] A second aspect of the present invention provides a herringbone completion construction method, which specifically comprises the following steps:

[0032] The first step is to install the needle tube on the ground and connect it to the outer oil pipe, and plug the lower part of the outer oil pipe;

[0033] The second step is to lower the outer tubing into the casing, and then lower the inner tubing into the outer tubing, requiring the position of the packer on the inner tubing to be lower than the orifice of the outer tubing, and rotating the inner tubing to set the packer;

[0034] The third step is that after the packer is set, liquid is pumped into the inner oil pipe through a pump truck on the ground. Driven by the high-pressure liquid, the needle tube breaks the rock and drills under the action of the self-propelled nozzle, and then extends into the storage formation to form a jet channel; at the same time, gas is introduced into the annulus between the inner and outer oil pipes, and the gas will enter the annulus between the outer oil pipe and the casing through the holes on the outer oil pipe to form a gas circulation. By continuously circulating the gas, the return liquid formed by the injection is lifted to the wellhead for discharge.

[0035] The third aspect of the present invention provides the application of the above-mentioned herringbone completion in oil and gas field development.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] During construction, the present invention first installs a needle tube on the ground and connects it to the outer oil pipe, and blocks the lower part of the outer oil pipe; then lowers the outer oil pipe into the casing, and then lowers the inner oil pipe into the outer oil pipe, requiring that the position of the packer on the inner oil pipe is lower than the position of the orifice of the outer oil pipe; the inner oil pipe is rotated to seal the packer, and the inner oil pipe is tried to be lifted to observe the change of the hanging weight to judge the sealing state of the packer; after the packer is sealed, liquid is pumped into the inner oil pipe by a pump truck on the ground, and the high-pressure liquid The lower needle tube is driven to break the rock and drill under the action of the self-propelled nozzle, and then extends into the storage formation to form a jet channel; at the same time, gas is introduced into the annulus between the inner and outer oil pipes, and the gas enters the annulus between the outer oil pipe and the casing through the orifice on the outer oil pipe to form a gas circulation. By continuously circulating the gas, the return liquid formed by the injection is lifted to the wellhead for discharge. This not only forms a negative pressure area in the wellbore to reduce the jet construction pressure, but also circulates the cuttings out of the wellbore in time.

[0038] The technology of the present invention utilizes an inner and outer double-layer oil pipe structure to form a circulation channel after the inner layer of the oil pipe is sealed. The inner layer of the oil pipe is pressurized to drive the needle tube to jet drilling. The circulating gas in the annulus of the casing and the outer layer of the oil pipe lifts the returned cuttings liquid. The circulating gas in the oil-casing annulus is utilized to reduce the annulus pressure, so that the returned formation liquid can be discharged in time through the oil-casing annulus.

[0039] The present invention can not only reduce the jet construction pressure and improve the submerged jet injection effect, but also return the liquid in time to protect the reservoir from pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a structural schematic diagram of a herringbone completion of the present invention;

[0041] Figure 2 It is a schematic diagram of the fluid flow path during the herringbone completion construction process of the present invention;

[0042] Figure 3 This is the assembly structure diagram of the needle tube on the outer oil tube;

[0043] Figure 4 It is a structural schematic diagram of a self-advancing sprinkler.

[0044] In the figure, 1, casing, 2, inner oil pipe, 3, outer oil pipe, 4, orifice, 5, packer, 6, needle tube, 7, hole slide, 8, self-propelled nozzle, 801, shell, 802, rear nozzle, 803, forward nozzle. DETAILED DESCRIPTION

[0045] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0046] The main idea of ​​the present invention is to introduce the gas lift process into the flexible tube jet herringbone well technology by adopting the upper concentric double-tube structure, forming a negative pressure area at the upper part of the wellbore, reducing the jet construction pressure, improving the cuttings circulation efficiency, and protecting the reservoir from pollution.

[0047] [Example 1]

[0048] This embodiment provides a herringbone completion, such as Figure 1 As shown, including:

[0049] Casing 1;

[0050] The outer oil pipe 3 is arranged in the casing 1, the bottom of the outer oil pipe 3 is a plug, and the outer oil pipe 3 is provided with a needle tube 6 and an orifice 4 in sequence from bottom to top;

[0051] The inner layer oil pipe 2 is arranged in the outer layer oil pipe 3. The lower part of the inner layer oil pipe 2 is connected to the packer 5. The position of the packer 5 is lower than the position of the outer layer oil pipe orifice 4. In this way, after the packer 5 expands, the annulus between the inner and outer layer oil pipes is sealed, and a circulation channel between the outer layer oil pipe and the casing is formed in the pipe string structure above the packer 5.

[0052] During construction, first install the needle tube 6 on the ground and connect it to the outer oil pipe 3, and plug the lower part of the outer oil pipe 3; then lower the outer oil pipe 3 into the casing 1, and then lower the inner oil pipe 2 into the outer oil pipe 3, requiring the position of the packer 5 on the inner oil pipe 2 to be lower than the position of the orifice 4 of the outer oil pipe; rotate the inner oil pipe to set the packer 5, try to lift the inner oil pipe 2 to observe the change of the hanging weight, and judge the setting state of the packer;

[0053] like Figure 2 As shown, after the packer 5 is set, liquid is pumped into the inner oil pipe 2 by a pump truck on the ground, and the needle tube is driven by the high-pressure liquid to break the rock and drill under the action of the self-propelled nozzle, and then extends into the storage formation to form a jet channel; at the same time, gas is introduced into the annulus between the inner oil pipe 2 and the outer oil pipe 3, and the gas will enter the annulus between the outer oil pipe 3 and the casing 1 through the orifice 4 on the outer oil pipe 3 to form a gas circulation. By continuously circulating the gas, the return liquid formed by the injection is lifted to the wellhead for discharge, which not only forms a negative pressure area in the wellbore to reduce the jet construction pressure, but also circulates the cuttings out of the wellbore in time.

[0054] The present invention utilizes an inner and outer double-layer oil pipe structure to form a circulation channel after the inner layer oil pipe is sealed. While the inner layer oil pipe is pressurized to drive the needle tube to jet drilling, gas circulates in the annulus of the casing and the outer layer oil pipe to lift the returned liquid from the cuttings. The circulating gas injection in the oil-casing annulus reduces the annulus pressure and allows the returned liquid from the formation to be discharged in time through the oil-casing annulus.

[0055] The present invention can not only reduce the jet construction pressure and improve the submerged jet injection effect, but also return the liquid in time to protect the reservoir from pollution.

[0056] [Example 2]

[0057] There are 16 to 20 needle tubes 6 on the outer oil tube. Preferably, there are 4 to 5 needle tubes 6 on the outer oil tube 3 along the axial direction, and 4 needle tubes are evenly arranged on the radial section of the outer oil tube 3.

[0058] like Figure 3 As shown, the needle tube 6 is arranged on the outer oil pipe 3 through the hole slide 7. Specifically, a penetrating installation hole is arranged on the side wall of the outer oil pipe 3, the hole slide 7 is arranged in the installation hole, one end of the needle tube 6 is inserted into the hole slide 7 and a self-propelled nozzle 8 is arranged at the end thereof, and the other end of the needle tube 6 is located in the inner cavity of the outer oil pipe 3. After the packer 5 is sealed, liquid is pumped into the inner oil pipe through a pump truck on the ground. Under the drive of the high-pressure liquid, the needle tube breaks the rock and drills under the action of the self-propelled nozzle, and then extends in the open hole formation to form a jet channel.

[0059] like Figure 4 As shown, the self-propelled nozzle 8 includes a shell 801, which is a movable trumpet-shaped structure. The end of the shell 801 with a small opening is connected to the end of the needle tube, and a rearward nozzle 802 is arranged inside the end of the shell 801 with a small opening. The rearward nozzle 802 is arranged from the side wall of the shell to the axial direction, and the angle with the axial direction of the shell is 30-45°. The end of the shell 801 with a large opening is provided with a forward nozzle 803 inside, and the forward nozzle 803 is parallel to the axial direction of the shell 801. When the outer layer oil pipe 3 is pressurized, the pressure is transmitted to the self-propelled nozzle 8 by the needle tube 6. The self-propelled nozzle 8 breaks the rock through the forward nozzle 803, and the rearward nozzle 802 is pushed forward and continuously extends forward. Driven by the self-propelled nozzle 8, the needle tube 6 breaks the rock and drills along the hole slideway, and then extends in the open hole formation to form a jet channel.

[0060] The arrangement and structure of the needle tube and the self-propelled nozzle in the present invention may also be existing technologies, as long as they can achieve their functions. For details, please refer to existing public documents and will not be repeated here.

[0061] [Example 3]

[0062] like Figure 1 As shown, the outer layer oil pipe 3 is provided with a plurality of holes 4, and the plurality of holes 4 are evenly distributed along the circumference of the outer layer oil pipe 3, and the function of the holes 4 is to provide connection channels for the gas lift circulation.

[0063] The position of the hole 4 on the outer oil pipe 3 is as low as possible and as close to the hole slide 7 as possible. Its function is to serve as an outlet for circulating gas; secondly, it reduces the annular liquid column pressure between the casing and the outer oil pipe on the self-feeding nozzle, so that the formation pressure is higher than the liquid column pressure, thereby realizing negative pressure drilling.

[0064] The orifice position needs to be calculated in combination with the specific wellbore pressure distribution. 开口 The calculation formula is as follows:

[0065] HP 地层 / ρg≤H 开口 ≤H

[0066] In the formula,

[0067] H is the well depth at the hole slide, MPa;

[0068] P 地层 is the formation pressure, MPa;

[0069] ρ is the wellbore fluid density, kg / m 3 ;

[0070] g is the acceleration due to gravity, m / s 2 .

[0071] Before the jetting operation, the inner layer tubing is rotated to seal the packer. After the packer is sealed, the surface pump truck pressurizes the inner layer tubing. Driven by the high-pressure liquid, the needle tube breaks the rock and drills under the action of the self-feeding nozzle.

[0072] While the inner tubing is being drilled under pressure, gas is introduced into the annulus between the inner tubing and the outer tubing. The gas is preferably nitrogen. The gas will enter the annulus between the outer tubing and the casing through the holes on the outer tubing to form a gas circulation. By continuously circulating the gas, the return fluid formed by the injection is lifted to the wellhead for discharge. This not only forms a negative pressure zone in the wellbore to reduce the jet construction pressure, but also circulates the cuttings out of the wellbore in time.

[0073] [Example 4]

[0074] This embodiment provides a herringbone completion construction method, which specifically includes the following steps:

[0075] The first step is to install the needle tube 6 on the ground and connect it to the outer oil pipe 3, plug the lower part of the outer oil pipe 3, and sequentially set the needle tube 6 and the orifice 4 on the outer oil pipe 3 from bottom to top;

[0076] There are 16 to 20 needle tubes 6 arranged on the outer oil tube 3. Preferably, there are 4 to 5 needle tubes 6 arranged axially on the outer oil tube, and 4 needle tubes are evenly arranged on the radial section of the outer oil tube.

[0077] like Figure 3As shown, the needle tube 6 is arranged on the outer oil pipe 3 through the hole slide 7. Specifically, a penetrating installation hole is arranged on the side wall of the outer oil pipe 3, the hole slide 7 is arranged in the installation hole, one end of the needle tube 6 is inserted into the hole slide 7 and a self-propelled nozzle 8 is arranged at the end thereof, and the other end of the needle tube 6 is located in the inner cavity of the outer oil pipe 3. After the sealing device 5 is completed, liquid is pumped into the inner oil pipe through a pump truck on the ground. Under the drive of the high-pressure liquid, the needle tube breaks the rock and drills under the action of the self-propelled nozzle, and then extends into the storage formation to form a jet channel.

[0078] like Figure 4 As shown, the self-propelled nozzle 8 includes a shell 801, which is a trumpet-shaped structure. The end of the shell 801 with a small opening is connected to the end of the needle tube 6, and a rearward nozzle 802 is arranged inside the end of the shell 801 with a small opening. The rearward nozzle 802 is arranged from the side wall of the shell to the axial direction, and the angle with the axial direction is 30-45°. The end of the shell 801 with a large opening is provided with a forward nozzle 803 inside, and the forward nozzle 803 is parallel to the axial direction of the shell 801. When the outer layer oil pipe 3 is pressurized, the pressure is transmitted from the needle tube 6 to the self-propelled nozzle 8, and the self-propelled nozzle 8 breaks the rock through the forward nozzle 803, and the rearward nozzle 802 is pushed forward and continuously extends forward. Driven by the self-propelled nozzle 8, the needle tube 6 breaks the rock and drills along the hole slideway, and then extends in the storage formation to form a jet channel.

[0079] The second step is to lower the outer tubing 3 into the casing 1, and then lower the inner tubing 2 into the outer tubing 3, requiring the position of the packer 5 on the inner tubing 2 to be lower than the position of the orifice 4 of the outer tubing; rotate the inner tubing to set the packer 5, try to lift the inner tubing to observe the change of the hanging weight, and judge the setting state of the packer;

[0080] A plurality of holes 4 are arranged on the outer oil pipe 3 , and the holes 4 are evenly distributed along the circumference of the outer oil pipe 3 . The holes 4 are used to provide connection channels for the gas lift circulation.

[0081] The position of the hole on the outer oil pipe is as low as possible and as close to the hole slide as possible. Its function is to serve as an outlet for circulating gas; secondly, it reduces the annular liquid column pressure between the casing and the outer oil pipe on the self-feeding nozzle, making the formation pressure higher than the liquid column pressure, thereby realizing negative pressure drilling.

[0082] The orifice position needs to be calculated in combination with the specific wellbore pressure distribution. 开口 The calculation formula is as follows:

[0083] HP 地层 / ρg≤H 开口 ≤H

[0084] In the formula,

[0085] H is the well depth at the hole slide, MPa;

[0086] P 地层 is the formation pressure, MPa;

[0087] ρ is the wellbore fluid density, kg / m 3 ;

[0088] g is the acceleration due to gravity, m / s 2 .

[0089] The third step is that after the packer is set, liquid is pumped into the inner oil pipe through a pump truck on the ground. Driven by the high-pressure liquid, the needle tube breaks the rock and drills under the action of the self-feeding nozzle, and then extends into the storage formation to form a jet channel; at the same time, gas is introduced into the annulus between the inner and outer oil pipes. The gas will enter the annulus between the outer oil pipe and the casing through the holes on the outer oil pipe to form a gas circulation. By continuously circulating the gas, the return liquid formed by the injection is lifted to the wellhead for discharge. This not only forms a negative pressure area in the wellbore to reduce the jet construction pressure, but also circulates the cuttings out of the wellbore in time.

[0090] The technology of the present invention utilizes an inner and outer double-layer oil pipe structure to form a circulation channel after the inner layer of the oil pipe is sealed. The inner layer of the oil pipe is pressurized to drive the needle tube to jet drilling. The circulating gas in the annulus of the casing and the outer layer of the oil pipe lifts the rock cuttings and returns the liquid. The circulating gas in the oil-casing annulus is utilized to reduce the annular pressure, so that the formation return liquid can be discharged in time through the oil-casing annulus. This can not only reduce the jet construction pressure and improve the submerged jet injection effect, but also return the liquid in time to protect the reservoir from pollution.

[0091] [Example 5]

[0092] This embodiment provides the application of the herringbone completion described in the above embodiments 1-3 in the development of oil and gas fields.

[0093] The use of the technology of the present invention for oil and gas production can not only reduce the jet construction pressure and improve the submerged jet injection effect, but also return the liquid in time to protect the reservoir from pollution.

[0094] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0095] In the description of the present invention, unless otherwise specified, the terms "upper", "lower", "left", "right", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0096] The above technical solution is only one implementation mode of the present invention. For those skilled in the art, it is easy to make various types of improvements or modifications based on the principles disclosed in the present invention, and it is not limited to the technical solution described in the above specific embodiments of the present invention. Therefore, the above description is only preferred and does not have a restrictive meaning.

Claims

1. A herringbone completion, characterized in that: include: casing; An outer oil pipe is arranged in the casing, the bottom of the outer oil pipe is a plug, and the outer oil pipe is provided with a needle tube and an orifice in sequence from bottom to top; The inner layer oil pipe is arranged in the outer layer oil pipe, the lower part of the inner layer oil pipe is connected to a packer, and the position of the packer is lower than the position of the orifice of the outer layer oil pipe.

2. The herringbone completion according to claim 1, characterized in that: There are 16 to 20 needle tubes arranged on the outer oil tube; Preferably, 4 to 5 needle tubes are axially arranged on the outer oil tube, and 4 needle tubes are evenly arranged on the radial cross section of the outer oil tube.

3. The herringbone completion according to claim 1 or 2, characterized in that: The side wall of the outer oil pipe is provided with a penetrating mounting hole, and the eyelet slideway is arranged in the mounting hole; One end of the needle tube is inserted into the hole slideway and a self-feeding nozzle is arranged at the end thereof, and the other end of the needle tube is located in the inner cavity of the outer oil pipe.

4. The herringbone completion according to claim 3, characterized in that: The self-propelled nozzle includes a shell, which is a trumpet-shaped structure. The end of the shell with a small opening is connected to the end of the needle tube, and a backward nozzle is arranged inside the end of the shell with a small opening, and a forward nozzle is arranged inside the end of the shell with a large opening.

5. The herringbone completion according to claim 4, characterized in that: The backward nozzle is inclined from the side wall of the shell toward the axial direction, and the angle between the nozzle and the axial direction of the shell is 30-45°; and / or, The forward nozzle is parallel to the axial direction of the shell.

6. The herringbone completion according to claim 3, characterized in that: The outer oil pipe is provided with a plurality of holes, and the plurality of holes are evenly distributed along the circumferential direction on the outer oil pipe.

7. The herringbone completion according to claim 6, characterized in that: The position of the orifice on the outer oil pipe is as low as possible and close to the position of the eyelet slideway.

8. The herringbone completion according to claim 6, characterized in that: The orifice position needs to be calculated in combination with the specific wellbore pressure distribution. 开口 The calculation formula is as follows: H-P 地层 / ρg≤H 开口 ≤H Where, H is the well depth at the hole slide, MPa; P 地层 is the formation pressure, MPa; ρ is the wellbore fluid density, kg / m 3 ; g is the acceleration due to gravity, m / s 2 .

9. A herringbone completion method, characterized in that: The specific steps include: The first step is to install the needle tube on the ground and connect it to the outer oil pipe, and plug the lower part of the outer oil pipe; The second step is to lower the outer tubing into the casing, and then lower the inner tubing into the outer tubing, requiring the position of the packer on the inner tubing to be lower than the orifice of the outer tubing, and rotating the inner tubing to set the packer; The third step is that after the packer is set, liquid is pumped into the inner oil pipe through a pump truck on the ground. Driven by the high-pressure liquid, the needle tube breaks the rock and drills under the action of the self-propelled nozzle, and then extends into the storage formation to form a jet channel; at the same time, gas is introduced into the annulus between the inner and outer oil pipes, and the gas will enter the annulus between the outer oil pipe and the casing through the holes on the outer oil pipe to form a gas circulation. By continuously circulating the gas, the return liquid formed by the injection is lifted to the wellhead for discharge.

10. Application of the herringbone completion according to any one of claims 1 to 8 in oil and gas field development.

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