CN207568578U - Self-flowing water injection column - Google Patents

Abstract

The utility model provides a self-flowing water injection pipe column, which comprises a sleeve and an oil pipe arranged in the sleeve, wherein an oil sleeve annulus is formed between the sleeve and the oil pipe, and the oil pipe is sequentially connected with an upper packer, an eccentric water distributor and a lower packer from top to bottom; the upper packer is arranged above the water producing layer, and the lower packer is arranged between the water producing layer and the oil producing layer; the eccentric water distributor comprises a plurality of water nozzles which can be selected and arranged in the eccentric water distributor, the water nozzles comprise at least two communicating water nozzles and at least one closed water nozzle, the communicating water nozzles are used for communicating the inner side and the outer side of an oil pipe when self-flowing water is injected, the closed water nozzles are used for separating the inner side and the outer side of the oil pipe when a water injection layer is acidified and self-flowing oil extraction is carried out, and different communicating water nozzles have different flow rates. The utility model provides a self-flowing water injection tubular column can realize self-flowing water injection, acidizing and the integration of blowout oil recovery, guarantees the high efficiency and the low cost of oil well production.

Description

Self-flowing water injection column

technical field

The utility model relates to the technical field of downhole injection and production equipment in oil fields, in particular to a self-flowing water injection string.

Background technique

In the process of oil field development, the energy of the formation is constantly decreasing, and water is often injected to supplement the energy of the formation to maintain the stable production of the oil field. At present, the water sources of oilfield injection water are mainly ground fresh water, water intake from water source wells and water separated from oil layer production fluid. The water from these water sources needs to establish supporting pipe networks and inject them into the water injection layer through water injection pumps, and some remote wells are supplied by supporting The limitation of water injection well pattern restricts the water injection development of reservoirs. Self-flowing water injection technology can inject the water produced from the water-producing layer of the same well into the water-injection layer to supplement the formation energy, and it has gradually become a supplementary method of conventional water injection because of its economy and effectiveness.

At present, the artesian water injection process mainly uses bare tubing, that is, no other tools are connected to the tubing, and the water in the water-producing layer is directly injected into the formation, and it is difficult to achieve flow control. If oil production is required in the later stage of water injection, the oil production string must be replaced for oil recovery.

The self-flowing water injection process of bare tubing cannot realize the control of the injection volume, and the damage to the casing is relatively large; during oil production, the pipe string needs to be replaced for secondary completion, and the operation period is long; if the water injection layer needs to be acidified during the water injection process, the Coiled tubing jet fixed-point acidification is complex in process and high in cost.

Utility model content

The utility model provides a self-flowing water injection pipe column, which can realize the integration of self-flowing water injection, acidification and self-spraying oil production, and ensures high efficiency and low cost of oil well production.

The self-flowing water injection pipe string provided by the utility model includes a casing and an oil pipe arranged inside the casing, an oil casing annular space is formed between the casing and the oil pipe, and the oil pipe is sequentially connected with Upper packer, eccentric water distributor and lower packer;

The upper packer is arranged above the water-producing layer, and the lower packer is arranged between the water-producing layer and the oil-producing layer;

The eccentric water distributor includes a plurality of water nozzles optionally arranged in the eccentric water distributor, and the plurality of water nozzles include at least two communicating water nozzles and at least one closed water nozzle, and the communicating water nozzles are used for The inner and outer sides of the oil pipe are connected during self-flowing water injection, and the closed water nozzle is used to isolate the inner and outer sides of the oil pipe during acidification of the water injection layer and self-spraying oil production. Different connecting water nozzles have different flow rates.

The self-flowing water injection pipe column provided by the embodiment of the utility model can realize the integration of self-flowing water injection, acidification and self-spraying oil recovery by replacing the water nozzle in the eccentric water distributor, shorten the operation period and improve the work efficiency. At the same time, the formation energy is supplemented by self-flowing water injection, and the permeability is increased by acidizing the formation, thereby increasing the oil recovery rate.

Optionally, the eccentric water distributor further includes a working cylinder and a stopper, the working cylinder is connected to the oil pipe, and a A connected eccentric hole, the stopper is located in the eccentric hole and can move along the axial direction of the working cylinder under the traction of the steel wire, so as to enter or leave the working cylinder, and the water nozzle is located on the stopper .

Optionally, the lower packer is a self-testing packer, and the setting and sealing directions of the lower packer are the same.

Optionally, the upper packer is a hydraulic packer;

When positive pressure is applied to the tubing, the upper packer is set and sealed, and when reverse pressure is applied to the annulus of the oil casing, the upper packer is sealed.

Optionally, a ball seat is further provided in the oil pipe below the lower packer, and the ball seat is connected to the oil pipe through a shearable pin.

Optionally, the self-flowing water injection string further includes: a first tubing anchor arranged on the tubing, the first tubing anchor is located above the upper packer, and is used to anchor the tubing on the on the casing.

Optionally, the self-flowing water injection string further includes: a telescopic tube connected to the oil pipe and located above the first oil pipe anchor.

Optionally, the self-flowing water injection string further includes: a second oil pipe anchor arranged on the oil pipe, the second oil pipe anchor is located above the lower packer, and is used to anchor the oil pipe on the on the casing.

Optionally, the self-flowing water injection string further includes: a sand control screen arranged at the bottom end of the oil pipe to prevent solid impurities from entering the oil pipe during self-spraying oil recovery.

Optionally, a shoe plug is also provided at the bottom end of the sand control screen.

The working process of the self-flowing water injection string provided by the embodiment of the utility model is: perforating and re-perforating the position corresponding to the water-producing layer and the oil-producing layer on the casing; Above the water-producing layer, the lower packer is set between the water-producing layer and the oil-producing layer; throw a ball into the tubing, and the ball falls into the ball seat; positively pressurize into the tubing, and set the lower packer and the upper packer Continue to positively press into the tubing, the self-test channel of the lower packer is opened to realize the seal inspection; reversely pressurize into the annulus of the oil sleeve, and the upper packer checks the seal; continue to press positively into the tubing, the ball seat The pin is sheared and the ball seat and ball fall to the bottom of the tubing;

When the formation energy is insufficient, the plug is pulled out from the working cylinder of the eccentric water distributor through the steel wire, and the plug with a connected water nozzle is put into the working cylinder through the steel wire. Connect the water nozzle to enter the oil pipe and inject into the formation;

When the formation energy is sufficient, the plug with connected water nozzle is pulled out from the working cylinder of the eccentric water distributor through the steel wire, and the plug with closed water nozzle is put into the working cylinder through the steel wire, and the oil in the oil-producing layer enters the tubing to realize self-spraying production ;

When the permeability of the formation decreases, the plug is pulled out from the working cylinder of the eccentric water distributor through the steel wire, the plug with a closed water nozzle is put into the working cylinder through the steel wire, and acid liquid is injected into the oil pipe, and the acid liquid enters the formation to acidify effect.

The self-flowing water injection pipe column provided by the embodiment of the utility model, by salvaging the plug in the eccentric water distributor and replacing the water nozzle, can realize the integration of self-flowing water injection, acidification and self-spraying oil production without moving the pipe column, shortening the operation Cycle, improve work efficiency. At the same time, the energy of the formation is improved through self-flowing water injection, and the oil recovery rate is improved. The process of setting the self-flowing water injection string, checking the packer and salvaging the plug is simple and easy to operate. Tubing anchors and telescopic tubes have the functions of anchoring and compensation, which can effectively prevent the peristalsis of the tubing string and prolong the life of the tubing string.

Description of drawings

In order to illustrate the technical scheme of the utility model or the prior art more clearly, the accompanying drawings that need to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the accompanying drawings in the following description are the present invention. For some embodiments of the utility model, for those skilled in the art, other drawings can also be obtained according to these drawings on the premise of not paying creative efforts.

Fig. 1 is the structural representation of the self-flowing water injection column provided by the embodiment of the present invention;

Fig. 2 is a schematic structural view of the eccentric water distributor provided by the embodiment of the present invention.

Reference signs:

1 - casing;

2- oil pipe;

3- Upper Packer

4- Eccentric water distributor;

41 - work cylinder;

42 - stopper;

43 - eccentric hole;

5- Lower packer;

6-ball seat;

7 - the first tubing anchor;

8 - telescopic tube;

9- the second tubing anchor;

10-sand control screen;

11-shoe plugging;

100-aqueous layer;

200 - Oil pay zone.

Detailed ways

In order to make the purpose, technical solutions and advantages of the utility model clearer, the technical solutions in the utility model will be clearly and completely described below in conjunction with the accompanying drawings in the utility model. Obviously, the described embodiments are the embodiment of the utility model. Some of the embodiments are novel, but not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

In describing the present invention, it should be understood that the terms "center", "length", "width", "thickness", "top", "bottom", "upper", "lower", "Left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer", "axial", "circumferential", etc. The orientation or positional relationship shown in the figure is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the referred position or original must have a specific orientation, a specific configuration and operation, so it cannot be understood as a reference to this utility model. Utility model restrictions.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

In this utility model, unless otherwise specified and limited, the terms "installation", "connection", "connection", "fixation" and so on should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection, Or become one; it can be mechanically connected, it can be electrically connected, or it can communicate with each other; it can be directly connected or indirectly connected through an intermediary, and it can make the internal communication of two components or the interaction relationship between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model according to specific situations.

In the present invention, unless otherwise clearly specified and limited, a first feature being "on" or "below" a second feature may include direct contact between the first and second features, and may also include the first and second features being in direct contact with each other. The features are not in direct contact but through another feature between them. Moreover, "above", "above" and "above" the first feature on the second feature include that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. "Below", "beneath" and "under" the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.

Describe the utility model below with reference to accompanying drawing and in conjunction with specific embodiment.

Embodiment one

Fig. 1 is a structural schematic diagram of the self-flowing water injection string provided by the embodiment of the utility model. Referring to Fig. An oil casing annulus is formed between the tubing 1 and the tubing 2, and the tubing is connected with an upper packer 3, an eccentric water distributor 4, and a lower packer 5 in sequence from top to bottom; the upper packer 3 is set above the water-producing layer 100 , the lower packer 5 is set between the water-producing layer 100 and the oil-producing layer 200; the eccentric water distributor 4 includes a plurality of nozzles that can be arranged in the eccentric water distributor 4, and the plurality of nozzles include at least two communicating water nozzles. Nozzle and at least one closed water nozzle, the connecting water nozzle is used to connect the inside and outside of the oil pipe 2 during self-flowing water injection, and the closed water nozzle is used to isolate the inside and outside of the oil pipe 2 when the water injection layer is acidified and self-spraying oil production, different connecting water nozzles have different traffic.

In this embodiment, the working principle of the self-flowing water injection string is: the water-producing layer 100 and the oil-producing layer 200 are separated by the upper packer 3 and the lower packer 5, and the water nozzle in the eccentric water distributor 4 can be replaced. Control the different functions of the artesian water injection string for artesian water injection, acidification and self-spraying oil recovery. During the working process of self-flowing water injection, the water nozzle in the eccentric water distributor 4 is a connected water nozzle, and the water in the water-producing layer 100 enters the oil pipe 2 through the eccentric water distributor 4, and is injected into the formation to replenish energy for the oil-producing layer 200; different connected water nozzles With different flow rates, changing the communication nozzle can control the amount of water injected into the formation. When acidifying the formation, replace the faucet in the eccentric water distributor 4 with a closed faucet, inject acid liquid into the oil pipe 2, the acid liquid squeezes into the formation, dissolves the blockage, restores and improves the permeability of the formation. During self-spraying oil production, the water nozzle in the eccentric water distributor 4 is replaced with a closed water nozzle, and the oil in the oil-producing layer 200 is produced through the oil pipe 2 under the pressure difference to realize the self-spraying production.

It should be noted that in actual engineering, artesian water injection and self-injection oil production can be carried out many times. When the formation energy is insufficient, self-flowing water injection is used to replenish energy. When the formation energy is sufficient, self-injection oil production is carried out. When the formation energy is insufficient , repeat the previous step of self-flowing water injection. Acidizing work is to improve the permeability of the formation and further achieve the effect of increasing oil recovery when the solid matter in the formation is blocked and the permeability decreases.

In this embodiment, the working process of the self-flowing water injection string is:

S101, perforating and re-perforating the positions corresponding to the water-producing layer 100 and the oil-producing layer 200 on the casing 1;

S102, run the tubing 2 into the casing 1, set the upper packer 3 above the water-producing layer 100, and set the lower packer 5 between the water-producing layer 100 and the oil-producing layer 200;

S103, setting and checking the lower packer 5 and the upper packer 3;

S104, when the formation energy is insufficient, replace the water nozzle in the eccentric water distributor 4 with a connected water nozzle, the water in the water-producing layer 100 is injected into the formation through the eccentric water distributor 4, and the flow of water injection can be controlled by replacing the connected water nozzle with different sizes;

S105. When the formation energy is sufficient, replace the water nozzle in the eccentric water distributor 4 with a closed water nozzle, and the oil in the oil-producing layer 200 enters the oil pipe 2 to realize self-spraying production;

S106. When the permeability of the formation decreases, replace the faucet in the eccentric water distributor 4 with a closed faucet, inject acid liquid into the oil pipe 2, and the acid liquid enters the formation to acidify.

The self-flowing water injection pipe column provided by the embodiment of the utility model can realize the integration of self-flowing water injection, acidification and self-spraying oil recovery by replacing the water nozzle in the eccentric water distributor, shorten the operation period and improve the work efficiency. At the same time, the formation energy is supplemented by self-flowing water injection, and the permeability is increased by acidizing the formation, thereby increasing the oil recovery rate.

Embodiment two

Fig. 2 is a structural schematic diagram of the eccentric water distributor provided by the embodiment of the utility model. With reference to Fig. 2, the eccentric water distributor 4 also includes a work cylinder 41 and a stopper 42, the work cylinder 41 is connected to the oil pipe 2, and inside the work cylinder 41 There is an eccentric hole 43 located on one side of the axis of the working cylinder and communicating with the outside of the working cylinder. The plug 42 is located in the eccentric hole 43 and can move along the axial direction of the working cylinder 41 under the traction of the steel wire to enter or leave the working cylinder. The mouth is located on the obturator 42 .

Specifically, the working cylinder 41 is connected to the oil pipe 2, and the inner diameter of the working cylinder 41 communicates with the inner diameter of the oil pipe 2. The eccentric hole 43 provided on the working cylinder 41 is used to place the plug 42, and the eccentric hole 43 is also connected to the outside of the working cylinder. The plug 42 can be put into the working cylinder 41 or taken out from the working cylinder 41 by a fisher such as a wire. The water nozzle in the stopper 42 can be changed to a connected water nozzle or a closed water nozzle as required. When the plug 42 is a connecting nozzle, the inside and outside of the working cylinder 41 are connected, that is, the water in the oil jacket annulus can enter the inside of the oil pipe 2 through the connecting nozzle; when the nozzle inside the plug 42 is a closed nozzle, the working cylinder 42 is closed inside and outside, that is, the water in the oil jacket annulus cannot enter the oil pipe 2 inside.

In this embodiment, the lower packer 5 is a self-testing packer, and the setting and sealing directions of the lower packer 5 are the same. The self-sealing packer is sealed by the interference between the outer diameter of the packer and the inner diameter of the casing 1 and the working pressure difference. Press positively into the tubing 2 to set the lower packer 5, and continue to press positively, the self-testing channel inside the lower packer 5 is opened to realize the sealing.

In this embodiment, the upper packer 3 is a hydraulic packer. Hydraulic packers rely on liquid pressure to compress the packer, making the outer diameter of the packer larger to achieve sealing. When positive pressure is applied to the tubing 2, the upper packer 3 is set to seal, and when reverse pressure is applied to the oil casing annulus, the upper packer 3 is used to check the seal.

The position below the lower packer 5 in the oil pipe 2 is also provided with a ball seat 6, and the ball seat 6 is connected with the oil pipe 2 through a shearable pin. The ball seat 6 is an auxiliary structure for setting and checking the upper packer 3 and the lower packer 5. Before the upper packer 3 and the lower packer 5 are set, a ball needs to be thrown into the tubing 2, and the ball falls The ball seat plays a sealing role, so that the pressure of the oil pipe 2 will continue to rise when the oil pipe 2 is pressed, so as to set the upper packer 3 and the lower packer 5 . After the upper packer 3 and the lower packer 5 are set and checked, pressurization is continued, the pin connecting the ball seat 6 and the tubing 2 is cut off, and the ball seat 6 and the ball fall into the bottom of the tubing 2 . Next, normal water injection, oil recovery, acidification and other work can be carried out.

In this embodiment, the working process of the self-flowing water injection string is:

S201, perforating and re-perforating the positions corresponding to the water-producing layer 100 and the oil-producing layer 200 on the casing 1;

S202, run the tubing 2 into the casing 1, set the upper packer 3 above the water-producing layer 100, and set the lower packer 5 between the water-producing layer 100 and the oil-producing layer 200;

S203, throwing the ball into the tubing 2, and the ball falls into the ball seat 6;

S204, positively pressurize the tubing 2, and set the lower packer 5 and the upper packer 3;

S205. Continue to positively pressurize the tubing 2, open the self-testing channel of the lower packer 5, and realize the sealing test; reversely pressurize the oil casing annulus, and check the seal of the upper packer 3;

S206, continue to positively press into the oil pipe 2, the pin of the ball seat 6 is cut off, and the ball seat 6 and the ball fall into the bottom of the oil pipe 2;

S207. When the formation energy is insufficient, remove the plug 42 from the working cylinder 41 of the eccentric water distributor 4 through a steel wire, and put the plug 42 with a connected nozzle into the working cylinder 41 through a steel wire, and the water in the water production layer 100 Enter the oil pipe 2 through the oil jacket annulus, the eccentric water distributor 4 and the connecting water nozzle, and inject into the formation;

S208. When the formation energy is sufficient, remove the plug 42 with a connected water nozzle from the working cylinder 41 of the eccentric water distributor 4 through a steel wire, and put the plug 42 with a closed water nozzle into the working cylinder 41 through a steel wire to produce The oil in the oil layer 200 enters the oil pipe 2 to realize self-spraying production;

S209. When the permeability of the formation decreases, remove the plug 42 from the working cylinder 41 of the eccentric water distributor 4 through a steel wire, put the plug 42 with a closed nozzle into the working cylinder 41 through a steel wire, and inject it into the oil pipe 2 Acid liquid, acid liquid enters the formation to acidify.

The self-flowing water injection pipe column provided by the embodiment of the utility model, by salvaging the plug in the eccentric water distributor and replacing the water nozzle, can realize the integration of self-flowing water injection, acidification and self-spraying oil production without moving the pipe column, shortening the operation Cycle, improve work efficiency. At the same time, the energy of the formation is improved through self-flowing water injection, and the oil recovery rate is improved. The process of setting the self-flowing water injection string, checking the packer and salvaging the plug is simple and easy to operate.

Embodiment Three

On the basis of the above embodiment, continue to refer to FIG. 1, the self-flowing water injection string provided by this embodiment also includes: a first oil pipe anchor 7 arranged on the oil pipe 2, and the first oil pipe anchor 7 is located on the upper packer 3 for anchoring the tubing 2 on the casing 1. Optionally, the self-flowing water injection string further includes: a second tubing anchor 9 arranged on the tubing 2 , and the second tubing anchor 9 is located above the lower packer 5 for anchoring the tubing 2 on the casing 1 .

In the process of self-flowing water injection, acidizing, and self-flowing oil recovery, the fluctuation of the internal pressure of the oil well will cause the peristalsis of the tubing 2, which will easily cause the failure of the upper packer 3 and the lower packer 5. The first tubing anchor 7 and the second tubing anchor 9 are arranged above the upper packer 3 and the lower packer 5 respectively, when the tubing 2 is pressurized, as the pressure rises, the flukes of the tubing anchors stretch out Anchor tubing 2 to casing 1. The anchoring pressure of the tubing anchor is lower than the setting pressure of the packer. Therefore, the tubing anchor realizes the anchoring of the tubing 2 and the casing 1 before the packer is set. During the water injection and acidizing process, the first tubing anchor 7 and the second tubing anchor 9 can effectively prevent the peristalsis of the tubing string and prolong the life of the tubing string.

In this embodiment, the self-flowing water injection column further includes: a telescopic tube 8 connected to the oil pipe 2 and located above the first oil pipe anchor 7 . The inner and outer cylinders of the telescopic tube 8 are connected by a pin. When the oil pipe 2 is pressurized, the pin is cut off, and the telescopic tube 8 is in a telescopic state. configuration.

In this embodiment, the self-flowing water injection string further includes: a sand control screen 10, which is arranged at the bottom of the oil pipe 2, and is used to prevent solid impurities from entering the oil pipe 2 during the self-spraying oil production process. There are various types of sand control screens 10, including slotted screens, drilled screens, etc., which are not specifically limited here.

Further, the bottom end of the sand control screen 10 is also provided with a shoe plug 11 . The shoe plug is used to guide the oil pipe 2 into the well smoothly, and is used to prevent the ball seat 6 from falling into the wellbore. In fact, the water during gravity water injection and the acid liquid injected during acidification pass through the oil pipe 2 and the sand control screen 10, enter the annulus of the oil casing from the sand control screen 10, and then inject into the bottom of the well. During self-spraying oil recovery, oil enters the annulus of the oil casing from the oil-producing layer 200, enters the inside of the oil pipe 2 through the sand control screen 10, and then is transported out of the well through the oil pipe 2. It can be seen that it is necessary to connect the end of the oil pipe 2 with a plug.

The self-flowing water injection pipe column provided by the embodiment of the utility model, by salvaging the plug in the eccentric water distributor and replacing the water nozzle, can realize the integration of self-flowing water injection, acidification and self-spraying oil production without moving the pipe column, shortening the Job cycle, improve work efficiency. At the same time, the energy of the formation is improved through self-flowing water injection, and the oil recovery rate is improved. The process of setting the self-flowing water injection string, checking the packer and salvaging the plug is simple and easy to operate. Tubing anchors and telescopic tubes have the functions of anchoring and compensation, which can effectively prevent the peristalsis of the tubing string and prolong the life of the tubing string.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present utility model, and are not intended to limit it; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand : It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements to some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions depart from the various embodiments of the present invention Scope of technical solutions.

Claims (10)

1. a kind of flood suction tubing string, including casing and the oil pipe being arranged on inside described sleeve pipe, described sleeve pipe and the oil pipe Between formed oil jacket annular space, which is characterized in that the oil pipe be connected in turn from top to bottom upper packer, eccentric injection mandrel and under Packer；

The upper packer is arranged on above water yield formation, and the lower packet is arranged between the water yield formation and oil-producing formation；

The eccentric injection mandrel includes that the multiple water nozzles being arranged in the eccentric injection mandrel can be selected, and the multiple water nozzle includes At least two connection water nozzles and at least one closing water nozzle, the connection water nozzle are used to connect the oil pipe in flood suction Interior outside, the closing water nozzle are used for the interior outside that the oil pipe is isolated in the acidification of water filling layer and when oil flow production, described in difference Connecting water nozzle has different flows.

2. flood suction tubing string according to claim 1, which is characterized in that the eccentric injection mandrel further include seating nipple and Blanking plug, the seating nipple are connected on the oil pipe, are provided in the seating nipple positioned at the seating nipple axis side simultaneously With the eccentric orfice connected outside the seating nipple, the blanking plug is located in the eccentric orfice and can be described in steel wire traction lower edge The axial movement of seating nipple, with the into and out seating nipple, the water nozzle is located on the blanking plug.

3. flood suction tubing string according to claim 1, which is characterized in that the lower packet is self-test sealing packer, And the lower packet set with test envelope to suppress direction identical.

4. flood suction tubing string according to claim 3, which is characterized in that the upper packer is hydraulic packer；

When just being suppressed into the oil pipe, the upper packer is set, when being suppressed to the oil jacket annular space is counter, the upper packer Test envelope.

5. flood suction tubing string according to claim 4, which is characterized in that be located at the lower packet in the oil pipe The position of lower section is additionally provided with ball seat, and the ball seat is connect by the pin that can be cut with the oil pipe.

6. according to claim 1-5 any one of them flood suction tubing strings, which is characterized in that further include：It is arranged on the oil The first tubing anchor on pipe, first tubing anchor are located at the top of the upper packer, for by the tubing anchor in institute It states on casing.

7. flood suction tubing string according to claim 6, which is characterized in that further include：Telescoping tube, the telescoping tube connection On the oil pipe, and positioned at the top of first tubing anchor.

8. flood suction tubing string according to claim 7, which is characterized in that further include：Be arranged on the oil pipe Two tubing anchors, second tubing anchor are located at the top of the lower packet, for by the tubing anchor in described sleeve pipe.

9. flood suction tubing string according to claim 1, which is characterized in that further include：Sand control screen, the sand control screen The oil pipe bottom end is arranged on, for preventing solid impurity from entering the oil pipe during oil flow production.

10. flood suction tubing string according to claim 9, which is characterized in that the bottom end of the sand control screen is additionally provided with Guide shoe silk plug.