CN209780833U

CN209780833U - Separate and adopt packer

Info

Publication number: CN209780833U
Application number: CN201920429377.7U
Authority: CN
Inventors: 贾云祥; 彭绪海; 蒋涛
Original assignee: HUADING HONGJI PETROLEUM ENGINEERING TECHNOLOGY (BEIJING) Co Ltd
Current assignee: HUADING HONGJI PETROLEUM ENGINEERING TECHNOLOGY (BEIJING) Co Ltd
Priority date: 2019-04-01
Filing date: 2019-04-01
Publication date: 2019-12-13
Anticipated expiration: 2029-04-01

Abstract

the utility model provides a separate and adopt packer relates to oil gas field oil recovery technical field, include: the body, the body includes from lower extreme to upper end in proper order: the outer wall of the setting section is annularly provided with a plurality of sealing rings; a delivery string comprising: the lower end of the oil pipe is fixedly connected with the setting cone to form a first connecting mechanism, the lower end of the pull rod is fixedly connected with the setting valve to form a second connecting mechanism, and an annular cavity is formed between the first connecting mechanism and the second connecting mechanism; the pressure liquid can flow through the annular cavity and act on the bottom surface of the setting cone, and the setting cone can slide to the setting section from the diameter expanding section through the transition section under the action of the pressure liquid; the seat sealing valve is provided with a hollow cavity which is communicated downwards, a bypass hole is formed in the hollow cavity of the seat sealing valve, and the bypass hole is communicated with the annular cavity to form a reverse circulation flow channel. The utility model provides a separate and adopt packer can eliminate because of the factor that the tubular column activity, packing element shoulder are outstanding etc. lead to the packer inefficacy.

Description

separate and adopt packer

Technical Field

The application relates to the technical field of oil extraction of oil and gas fields, in particular to an isolated production packer.

background

In the process of oil exploitation, a downhole casing is damaged due to corrosion and the like, so that formation water enters a shaft and normal development of an oil field is affected, and therefore oil and water layers need to be separated. At present, a packer is generally used for separating an oil layer from a water layer so as to realize the production separation. In the prior art, packers are generally divided into two categories: one is to connect the packer directly to the production string and to realize setting by means of the tail pipe supported in the artificial well bottom, and the other is to realize setting by means of the slip of the packer to clamp the casing.

Through years of research, the applicant finds that the packer in the prior art mainly has the following defects: firstly, the production string is continuously abraded between the packer and the sleeve pipe due to movement or vibration in the oil extraction process, so that the failure of the packer is accelerated; secondly, when any part in the production string breaks down and needs to be replaced, the packer can be lifted out along with the oil pumping production string and is passively replaced, and the construction process is complicated; and thirdly, the packer rubber sleeve is damaged under the action of the interlayer pressure difference after being expanded and deformed, so that the service life of the packer is greatly shortened.

it should be noted that the above background description is provided only for the sake of clarity and complete description of the technical solution of the present invention, and for the understanding of those skilled in the art. These solutions are not considered to be known to the person skilled in the art merely because they have been set forth in the background section of the present invention.

SUMMERY OF THE UTILITY MODEL

In order to achieve the purpose, the packer for isolated production is suitable for operation occasions requiring reverse circulation, can eliminate the factors causing the failure of the packer due to the movement of a pipe column, the protruding shoulder of a rubber sleeve and the like, and can be favorable for the running-in construction of a subsequent oil pumping production pipe column. The technical scheme is as follows:

An isolation packer, comprising: the body, the body is hollow body, has relative upper end and lower extreme, the body includes from the lower extreme to the upper end in proper order: the outer diameter of the diameter expanding section is larger than that of the setting section, and a plurality of sealing rings are annularly arranged on the outer wall of the setting section;

A delivery string comprising: the oil pipe and the pull rod are sleeved in the oil pipe, wherein the lower end of the oil pipe is fixedly connected with the setting cone to form a first connecting mechanism, the lower end of the pull rod is fixedly connected with the setting valve to form a second connecting mechanism, and an annular cavity is formed between the first connecting mechanism and the second connecting mechanism;

The pressure liquid can flow through the annular cavity and act on the bottom surface of the setting cone, the setting cone can slide from the diameter expanding section to the setting section through the transition section under the action of the pressure liquid, and the setting section and the sealing ring are both expanded; the setting valve is provided with a hollow cavity which is communicated downwards, a ball seat and a steel ball are arranged in the setting valve, and the steel ball is arranged on the ball seat; the ball seat is characterized in that a bypass hole is formed in the hollow cavity of the seat sealing valve, the steel ball leaves the ball seat under the action of fluid, and the hollow cavity, the bypass hole and the annular cavity are communicated to form a reverse circulation flow channel.

As a preferred embodiment, the lower end of the body is further provided with a sealing seat, the sealing seat is provided with a hollow cavity, a hanging short section is arranged in the sealing seat, and a first limiting mechanism for limiting the hanging short section to be separated from the lower end of the body is arranged between the sealing seat and the hanging short section;

The hanging short section is provided with a hollow cavity, the setting valve is installed inside the hanging short section, and a second limiting mechanism used for limiting the setting valve to be separated from the lower end of the hanging short section is arranged between the setting valve and the hanging short section.

As a preferred embodiment, the seat valve further comprises: the filter pipe is positioned at the lower part of the seat valve, a plurality of small holes are formed in the filter pipe, and the small holes are communicated with the hollow cavity of the seat valve.

As a preferred embodiment, the pull rod has a solid rod body, the lower end of the rod body is fixedly connected with the upper end of the setting valve, the upper end of the rod body is provided with a protruding portion, and the outer diameter of the protruding portion is larger than the inner diameter of the setting cone and smaller than the inner diameter of the oil pipe.

in a preferred embodiment, the clearance between the outer diameter of the rod body and the inner diameter of the setting cone is not less than 6 mm.

In a preferred embodiment, a first locking member is disposed between the hanging nipple and the setting valve, a first groove is disposed on an inner wall of the hanging nipple, a second groove is disposed on an outer wall of the setting valve, and the first groove and the second groove cooperate to form a cavity for accommodating the first locking member.

as a preferred embodiment, a second locking member is disposed between the hanging nipple and the sealing seat, and a third groove for accommodating the second locking member is disposed on an outer wall of the hanging nipple.

In a preferred embodiment, a second locking member is arranged between the hanging short section and the setting valve, and the locking force of the second locking member is greater than that of the first locking member; and a third groove for accommodating the second locking piece is formed in the outer wall of the hanging short section.

in a preferred embodiment, a first production string is fixedly connected to the lower end of the hanging nipple.

The packer can be used for reverse circulation operation. When the hydraulic setting valve is used, a preset amount of pressure liquid is injected into an annular space between the sleeve and the packer body, the pressure liquid can push the steel ball to leave the ball seat after reaching the bottom of the setting valve, the pressure liquid flows through the reverse circulation flow channel, at the moment, the pressure liquid is changed into positive pressure, namely, the pressure liquid is injected into the annular space between the first connecting mechanism and the second connecting mechanism, and the pressure liquid acts on the bottom of the setting cone. The setting awl can slide to from the expanding section under hydraulic promotion the setting section, can drive setting section and sealing ring external diameter increase, accomplish the setting.

The sealing ring after being seated is pressed between the body and the casing pipe to play the dual functions of sealing and hanging, then the oil pipe is played, a series of accessories in the packer are played together under the driving of the oil pipe, then the production pipe column is put in, and the subsequent oil extraction operation is carried out. Compared with the packer in the prior art, the packer can eliminate the factors causing the failure of the packer due to the movement of a pipe column, the protrusion of the shoulder of the rubber sleeve and the like.

Specific embodiments of the present application are disclosed in detail with reference to the following description and drawings, indicating the manner in which the principles of the application may be employed. It should be understood that the embodiments of the present application are not so limited in scope. The embodiments of the application include many variations, modifications and equivalents within the spirit and scope of the appended claims.

features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.

It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps or components.

Drawings

FIG. 1 is a schematic structural view of an isolation packer in an embodiment of the present application;

FIG. 2 is a schematic structural view of the expanded diameter section of the body in FIG. 1;

FIG. 3 is a schematic illustration of a set packer in an embodiment of the present disclosure;

FIG. 4 is an enlarged view of a portion of FIG. 3 at I;

FIG. 5 is a schematic view of a splicing tube/suspension sub combination in the practice of the present application;

FIG. 6 is a schematic structural diagram of a split production string according to an embodiment of the present application;

FIG. 7 is a schematic diagram of a unitary production string according to an embodiment of the present application.

Description of reference numerals:

A. A sleeve; 101. a body; 101a, a setting section; 101b, a transition section; 101c, an expanding section; 102. a seal ring; 103. a sealing seat; 103a, a first limit step; 103b, an outer limit step; 201. setting a cone; 202. a seating valve; 202a, a bypass hole; 202b, a filter tube; 202c, a ball seat; 203. hanging the short section; 203a and a second limit step; 204. a steel ball; 301. an oil pipe; 302. a pull rod; 401. a first locking member; 402. a second locking member; 501. inserting a pipe; 501a, positioning steps; 6. an oil well pump; 7. a gas anchor; 8. and (7) bottom blocking.

Detailed Description

The technical solutions of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments, it should be understood that these embodiments are only used for illustrating the present invention and are not used for limiting the scope, and after reading the present invention, the modifications of the present invention in various equivalent forms by those skilled in the art will fall within the scope defined by the claims appended to the present application.

It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

The application provides an isolated production packer, as shown in figures 1 and 2, an isolated production packer, comprising: body 101, body 101 is hollow body, has relative upper end and lower extreme, body 101 includes from lower extreme to upper end in proper order: the setting device comprises an expanding section 101c, a transition section 101b and a setting section 101a, wherein the outer diameter of the expanding section 101c is larger than that of the setting section 101a, and a plurality of sealing rings 102 are annularly arranged on the outer wall of the setting section 101 a; a delivery string comprising: the oil pipe 301 and the pull rod 302 sleeved in the oil pipe 301, wherein the lower end of the oil pipe 301 is fixedly connected with the setting cone 201 to form a first connecting mechanism, the lower end of the pull rod 302 is fixedly connected with the setting valve 202 to form a second connecting mechanism, and an annular cavity is formed between the first connecting mechanism and the second connecting mechanism; the pressure liquid can flow through the annular cavity and act on the bottom surface of the setting cone 201, the setting cone 201 can slide from the diameter expanding section 101c to the setting section 101a through the transition section 101b under the action of the pressure liquid, and the setting section 101a and the sealing ring 102 are both expanded; the setting valve 202 is provided with a hollow cavity which penetrates downwards, a ball seat 202c and a steel ball 204 are arranged in the setting valve 202, and the steel ball 204 is arranged on the ball seat 202 c; a bypass hole 202a is formed in a hollow cavity of the setting valve 202, the steel ball 204 leaves the ball seat 202c under the action of fluid, the hollow cavity, the bypass hole and the annular cavity are communicated to form a reverse circulation flow channel, and the hollow cavity, the bypass hole 202a and the annular cavity are communicated to form a reverse circulation flow channel.

The packer is adopted to separate that this application embodiment provided is applicable to the occasion that requires to carry out reverse circulation operation. When the hydraulic pressure booster is used, a preset amount of pressure liquid is injected into an annular space between the casing A and the packer body 101, the pressure liquid can push the steel ball 204 to leave the ball seat 202c after reaching the bottom of the setting valve 202, the pressure liquid flows through the reverse circulation flow channel, at the moment, the pressure liquid is changed into forward pressure, namely, the pressure liquid is pumped into the annular space between the first connecting mechanism and the second connecting mechanism, and the pressure liquid acts on the bottom of the setting cone 201. The setting awl 201 can slide to the setting section 101a from the diameter-expanding section 101c under the hydraulic promotion, can drive the outside diameter increase of setting section 101a and sealing ring 102, accomplishes the setting.

the seated sealing ring 102 is pressed between the body 101 and the casing A to perform the dual functions of sealing and hanging, then the oil pipe 301 is taken out, a series of accessories in the packer are taken out together under the drive of the oil pipe 301, and then the packer is put into a production string to perform subsequent oil production operation. Compared with the packer in the prior art, the packer can eliminate the factors causing the failure of the packer due to the movement of a pipe column, the protrusion of the shoulder of the rubber sleeve and the like.

Specifically, the body 101 of the packer may be a metal pipe with good plasticity, and the specific material is not limited. The body 101 has a hollow cavity and has opposite upper and lower ends. In the embodiment of the present application, the upper end and the lower end of the body 101 are exemplified by the direction in which the packer is lowered into the vertical well section, and the packer for isolation and production provided by the embodiment of the present application is not limited to other working scenes, such as horizontal well operation.

include in proper order from the lower extreme of body 101 to the upper end: expanding diameter section 101c, transition section 101b, setting section 101 a. The expanding section 101c and the setting section 101a are connected by a transition section 101b, said transition section 101b having an inclined slope. The outer diameter of the expanding section 101c is slightly larger than that of the setting section 101a, and the specific sizes of the outer diameters of the expanding section 101c and the setting section 101a are not limited and can be adjusted according to the actual inner diameter of the used casing A. A plurality of sealing rings 102 are annularly arranged on the outer wall of the setting section 101a, the sealing rings 102 can be fixed on the outer wall of the setting section 101a through vulcanization or adhesion, and the sealing rings 102 can be rubber cylinders.

The delivery string includes: tubing 301 and pull rod 302. The oil pipe 301 is sleeved in the body 101, the oil pipe 301 is provided with an upper end and a lower end which are opposite, the upper end of the oil pipe 301 is connected with a plurality of sections of pipe columns, the lower end of the oil pipe 301 is fixedly connected with the setting cone 201 to form a first connecting mechanism, and the connecting mode can be threaded connection. Specifically, the setting cone 201 has relative upper end and lower extreme, and the upper end of setting cone 201 can be provided with the internal thread, the lower extreme of oil pipe 301 is equipped with the external screw thread, and the internal thread of setting cone 201 matches with the external screw thread of oil pipe 301 and realizes being connected. The pull rod 302 is sleeved inside the oil pipe 301, the pull rod 302 is provided with an upper end and a lower end which are opposite, the lower end of the pull rod 302 is fixedly connected with the setting valve 202 to form a second connecting mechanism, and the fixed connecting mode can be threaded connection. On the whole, as shown in fig. 1, the second connecting mechanism is sleeved in the first connecting mechanism, an annular cavity is formed between the first connecting mechanism and the second connecting mechanism, and pressure fluid can flow through the annular cavity and act on the bottom surface of the setting cone 201 and the top surface of the setting valve 202.

The setting cone 201 has a hollow cavity, which may be a hollow metal body. The outer wall of the setting cone 201 is in contact with the diameter expanding section 101c, and the setting cone 201 can slide to the setting section 101a from the diameter expanding section 101c under the action of hydraulic pressure, so that the setting section 101a and the transition section 101b are subjected to plastic deformation integrally; at this time, the setting section 101a, the transition section 101b and the expanding section 101c are consistent in size, the sealing ring 102 on the setting section 101a is expanded, and the outer wall of the sealing ring 102 is attached to the casing pipe, so that setting is realized.

Further, the setting cone 201 may have a first section contacting the inner wall of the expanding section 101c and a second section contacting the inner wall of the setting section 101 a. The setting valve 202 is arranged in the expanding section 101c and is positioned at the lower part of the setting cone 201. The seat valve 202 is a tubular structure, which may be made of metal and has a hollow cavity. Seat valve 202 embeds there are ball seat 202c and steel ball 204, and is specific, and seat valve 202 is provided with first spacing step and the spacing step of second on its both sides inner wall, first spacing step with the spacing step of second cooperatees and is used for sitting in steel ball 204, steel ball 204 can carry out the shutoff to the cavity of seat valve 202. A bypass hole 202a is formed in a hollow cavity of the seat seal valve 202, the bypass hole 202a is communicated with the annular cavity, the number of the bypass holes 202a is not particularly limited, and the hollow cavity, the bypass hole 202a and the annular cavity are communicated to form a reverse circulation flow channel. The seat valve 202 further comprises: the filter pipe 202b, the filter pipe 202b is used for filtering the impurity in the pressure liquid, the filter pipe 202b is located the lower part of the seat valve 202, a plurality of apertures have been seted up on the filter pipe 202b, the aperture with the cavity body intercommunication of seat valve 202.

Further, the outer diameter of the setting valve 202 is larger than the inner diameter of the setting cone 201, so that the setting valve 202 cannot be pulled out upwards under the restriction of the setting cone 201. Since the maximum outer diameter of the setting cone 201 is approximately the inner diameter of the expanding section 101c, the maximum outer diameter of the setting cone 201 is larger than the inner diameter of the setting section 101a, and therefore the setting cone 201 cannot be pulled out upwards without being subjected to external force. A plurality of sealing rings are further arranged between the first section of the setting cone 201 and the diameter expanding section 101c, and grooves for containing the sealing rings are formed in the outer wall of the setting cone 201, so that sealing can be formed between the setting cone 201 and the diameter expanding section 101 c.

The drawbar 302 is embodied as a solid bar structure having opposite upper and lower ends. The lower end of the rod body is fixedly connected with the upper end of the seat valve 202, and the upper end of the rod body is provided with a protruding part. The outer diameter of the convex part is larger than the inner diameter of the setting cone 201 and smaller than the inner diameter of the oil pipe 301. The external diameter of the body of rod and body of rod bottom screw thread all is less than the internal diameter of setting awl 201, and is preferred, and the body of rod and the external diameter of body of rod bottom screw thread and the space of setting between the awl 201 internal diameter are 6mm at least, guarantee like this that the body of rod can be smoothly through the cavity of setting awl 201, can also reserve sufficient liquid passage for this passageway of flowing through that liquid can be smooth is used in the bottom surface of setting awl 201.

In this embodiment, as shown in fig. 2, a sealing seat 103 is further disposed at the lower end of the body 101, the sealing seat 103 has a hollow cavity, a hanging nipple 203 is disposed in the sealing seat 103, and a first limiting mechanism for limiting the hanging nipple 203 from coming off from the lower end of the body 101 is disposed between the sealing seat 103 and the hanging nipple 203; the hanging short section 203 is provided with a hollow cavity, the setting valve 202 is installed inside the hanging short section 203, and a second limiting mechanism used for limiting the setting valve 202 to be separated from the lower end of the hanging short section 203 is arranged between the setting valve 202 and the hanging short section 203.

the sealing seat 103 is a metal circular tube with a hollow cavity, and the specific material is not limited in this application. The sealing seat 103 may be coupled to the lower end of the body 101 by means of a screw connection. Specifically, the upper end of the sealing seat 103 is provided with an external thread, and the lower end of the body 101 is provided with an internal thread. A plurality of sealing rings can be arranged between the sealing seat 103 and the body 101, and a groove for accommodating the sealing rings is arranged on the outer wall of the sealing seat 103. The hanging short section 203 is seated in the sealing seat 103, and the relative position of the hanging short section 203 and the sealing seat 103 is fixed through the first limiting mechanism, so that the hanging short section 203 is prevented from being separated from the bottom of the sealing seat 103.

further, as shown in fig. 2 and 5, a first limit step 103a is disposed at an upper end of the seal seat 103, and correspondingly, an outer limit step 103b is disposed on an outer wall of the hanging nipple 203. The first limit step 103a is matched with the outer limit step 103b to form a first limit mechanism, so that the hanging short section 203 is prevented from being separated downwards. The hanging short section 203 is seated at the lower end of the sealing seat 103 through the first limiting mechanism, so that the hanging short section 203 can be separated from the body 101 when the hanging short section is independently salvaged. If sand washing is needed or the connecting parts below the hanging short joints 203 are overhauled, the hanging short joints 203 can be fished, and the parts needing to be overhauled are overhauled. After the maintenance is finished, the hanging short joint 203 can be re-seated on the first limit step 103 a.

Hang nipple 203 for the metal pipe that has the cavity, concrete material this application does not do the restriction. The hanging short section 203 is provided with an upper end and a lower end which are opposite, the setting valve 202 is installed in the hanging short section 203, and the relative position of the hanging short section 203 and the setting valve 202 is fixed through the second limiting mechanism, so that the setting valve 202 is prevented from being separated from the lower end of the hanging short section 203. A second limiting step 203a is arranged on the inner wall of the hanging short section 203, and correspondingly, a limiting step (not shown in the figure) matched with the second limiting step 203a is arranged on the outer wall of the setting valve 202. The second limit step 203a is matched with the limit step to form a second limit mechanism, so that the setting valve 202 is prevented from being separated downwards.

Further, a plurality of sealing rings may be disposed between the setting valve 202 and the hanging nipple 203, and between the hanging nipple 203 and the sealing seat 103. Grooves for containing sealing rings are formed in the outer wall of the setting valve 202 and the outer wall of the hanging short section 203.

In one embodiment, as shown in fig. 2 and 5, a first locking member 401 is disposed between the hanging nipple 203 and the setting valve 202, a first groove is disposed on an inner wall of the hanging nipple 203, a second groove is disposed on an outer wall of the setting valve, and the first groove and the second groove cooperate to form a cavity for receiving the first locking member 401.

The first locking piece 401 is specifically a small snap spring, the small snap spring is an open elastic metal ring, and the cross section of the small snap spring is in an inward flat and outward protruding shape. During the installation, little jump ring installation extremely in the second recess, when sitting into this seat valve 202, little jump ring can be blocked into to hanging the first recess on the nipple joint 203 inner wall, will sit valve 202 and hang nipple joint 203 and connect.

Specifically, the packer is first assembled, as shown with reference to fig. 1-5. A setting cone 201 is mounted in the body 101 with its cone surface against the transition section 101 b. And a first locking member 401 is arranged in a second groove on the outer wall of the setting valve 202, the setting valve 202 is arranged in the hanging short section 203 and is seated on the second limit step 203a, and meanwhile, an outward protruding inclined surface of the first locking member 401 is clamped to the first groove on the hanging short section 203. The setting valve 202 is installed in the diameter expanding section 101c together with the hanging nipple 203, and then the seal seat 103 is installed. Finally, the oil pipe 301 is passed through the inside of the body 101 to be connected with the setting cone 201, and then the pull rod 302 is passed through the oil pipe 301 to be connected with the setting valve 202.

Because the sealing seat 103 is fixed at the lower end of the body expanding section 101c, and the upper end surface of the sealing seat 103 is provided with the first limiting step 103a, the outer limiting step 103b of the hanging short section 203 abuts against the first limiting step 103a, and the hanging short section 203 cannot be separated downwards. The hanging nipple 203 cannot be pulled out downwards, so that the setting cone 201 is restrained from being pulled out downwards. Because the maximum outer diameter of the setting cone 201 is larger than the inner diameter of the setting section 101a of the body 101, the setting cone 201 cannot be separated upwards, and the hanging short section 203 is restricted from being separated upwards as a result that the setting cone 201 cannot be separated upwards. The setting valve 202 is installed in the hanging nipple 203, is limited by the second limit step 203a of hanging nipple 203 and can not move downwards, and the external diameter of the setting valve 202 is larger than the internal diameter of the setting cone 201, and the setting cone 201 restricts the setting valve 202 to move upwards, so that the setting valve 202 can not move under the condition of bearing external pressure in the process of descending the well of a tubular column.

the embodiment of the application also provides a construction method adopting the packer for separate mining, and the construction method comprises the following steps:

S10: injecting a predetermined amount of said pressure fluid from between casing a and said packer, said pressure fluid flowing through said reverse circulation flow path;

S20: injecting the pressure liquid from the annular cavity;

s30: after the oil pipe 301 rises to a preset distance, the oil pipe 301 is lifted, and the oil pipe 301 drives the setting cone 201, the pull rod 302, the setting valve 202 and the hanging pup joint 203 to rise together;

S40: connecting the hanging nipple 203 on a production string, running the production string connected with the hanging nipple 203, and sitting the hanging nipple 203 on the first limiting mechanism on the sealing seat 103.

Specifically, in step S10, a pressure fluid is first injected into an annular space between the casing a and the packer, where the predetermined amount of the pressure fluid is specifically 1.5 times to 2 times of the wellbore volume above the depth of the packer, and after reaching the bottom of the setting valve 202, the pressure fluid is filtered by the filtering pipe 202b of the setting valve 202 and enters the hollow cavity of the setting valve 202, and under the action of the hydraulic pressure, the hydraulic pressure can push the steel ball 204 to leave the ball seat 202c, so that the return circulation flow passage is opened, and the pressure fluid enters the annular cavity through the bypass hole 202 a.

in step S20, after reverse circulation, forward pressurizing is performed instead, pressure fluid is injected into the annular cavity, the hydraulic pressure is transmitted to the outside of the oil pipe 301 through the inner space of the oil pipe 301, the steel ball 204 closes the return circulation flow channel under the action of the hydraulic pressure, and the hydraulic pressure finally acts on the top surface of the setting valve 202, the top surface of the hanging nipple 203 and the bottom surface of the setting cone 201. The pressure acting on the top surfaces of the setting valve 202 and the hanging nipple 203 can generate downward thrust, but the downward thrust cannot make the setting valve 202 and the hanging nipple 203 move downwards because the sealing seat 103 is fixedly connected with the lower end of the body 101. The pressure acting on the bottom surface of the setting cone 201 will generate an upward thrust to push the setting cone 201 to move upward. Under the action of the thrust, the setting cone 201 presses the body 101, and when the thrust is greater than the yield limit of the material of the body 101, the body 101 expands to generate permanent deformation, and the sealing ring 102 on the outer wall of the setting section 101a is tightly pressed between the body 101 and the casing A along with the expansion of the body 101. When the setting cone 201 is pushed out of the top end of the body 101, the pressure suddenly drops to zero and the packer setting is completed. At this time, the inner diameter of the setting section 101a of the body 101 is the same as that of the expanding section 101c, the transition section 101b disappears, and the compressed sealing ring 102 performs the dual functions of sealing and suspending, as shown in fig. 3 and 4.

In step S30, after the setting cone 201 drives the oil pipe 301 to rise a predetermined distance, the oil pipe 301 is lifted up, the setting cone 201 will rise out along with the oil pipe 301, because the outer diameter of the upper end of the pull rod 302 is larger than the inner diameter of the setting cone 201, the setting cone 201 will drive the pull rod 302 and the setting valve 202 connected below the pull rod 302 to rise together, the setting valve 202 drives the hanging sub 203 to rise together through the first locking member 401, and only the set packer and the sealing seat 103 are left in the well, as shown in fig. 3.

In step S40, after the packer is set, a production string is run in the well for subsequent production operations, as shown in fig. 2, 5 and 7. Specifically, be connected with oil-well pump 6 on the production string, can be connected with and hang nipple joint 203 below oil-well pump 6, hang the lower extreme of nipple joint 203 and have annexes such as gas anchor 7, end stifled 8 through threaded connection. When a production string connected with the accessories is put in, the outer limit step 103b on the hanging nipple 203 is seated into the first limit step 103a on the sealing seat 103.

Even if slight creeping and movement occur in the oil production operation, the production string after being set cannot drive the packer to move, so that the failure factor of the packer caused by friction between the sealing ring 102 and the sleeve A can be avoided. After the production string is put in, the water outlet layer is separated by the packer and the sealing between the casing A and between the hanging nipple 203 and the sealing seat 103, and the oil in the oil layer enters the oil well pump 6 through the gas anchor 7 and is pumped out.

in this embodiment, the oil pump 6 may be connected below the hanging nipple 203 as required, so as to increase the sinking degree of the pump and improve the pump efficiency.

In another embodiment, a second locking member 402 is disposed between the hanging nipple 203 and the sealing seat 103, and a third groove for receiving the second locking member 402 is disposed on an outer wall of the hanging nipple 203. The locking force of the second locking member 402 is greater than that of the first locking member 401.

The second locking part 402 is a large clamp spring, the large clamp spring is an open elastic metal ring, and the cross section of the large clamp spring is in an inward flat and outward protruding shape. Although the cross section shapes of the large snap spring and the small snap spring are the same, the cross section areas, the angles of the outward protruding inclined planes and the sizes of the inner diameter and the outer diameter are different, and the snap springs with different locking forces can be designed by adjusting the parameters. During installation, the large clamp spring is installed in the third groove, and the third groove is formed in the lower end of the hanging short section 203. When the hanging nipple 203 is set in, the large snap spring can be clamped into the lower end of the sealing seat 103 and bounces open, and the outer protruding inclined plane can abut against the lower end of the sealing seat 103. Because the locking dynamics of second retaining member 402 is greater than first retaining member 401, consequently even under the condition of installing first retaining member 401 and second retaining member 402 simultaneously, can guarantee to sit and seal valve 202 when the process of rising upwards, can only break loose from first retaining member 401, and can not take over hanging nipple 203 altogether.

It should be noted that, if the hanging nipple 203 does not need to be lifted out, the first locking member 401 does not need to be installed, so that the hanging nipple 203 is prevented from being lifted out together with the setting valve 202 when lifted out, and only the second locking member 402 needs to be installed at this time. If the hanging sub 203 needs to be lifted out with the setting valve 202, the second locking member 402 cannot be installed, and only the first locking member 401 is installed.

In the embodiment, when the second locking member 402 is installed between the hanging nipple 203 and the sealing seat 103, the lower end of the hanging nipple 203 is fixedly connected with a first production string.

Specifically, the packer is first assembled, as shown with reference to fig. 1-6. A setting cone 201 is mounted in the body 101 with its cone surface against the transition section 101 b. Then the setting valve 202 is installed in the hanging nipple 203 and set on the second limit step 203a, and the first locking piece 401 can be installed or not. Preferably, the first locking member 401 is not installed. The setting valve 202 is installed in the diameter expanding section 101c together with the hanging nipple 203, and then the seal seat 103 is installed. A second retaining member 402 is mounted in a third recess of the hanging sub 203. Firstly, oil pumping accessories such as a bottom plug 8, a gas anchor 7 and the like are put into a well in sequence according to the designed depth, then the hanging short section 203 is connected with a first production pipe column which is put into the well, and the lower end of the hanging short section 203 is provided with a thread for connection. Finally, the oil pipe 301 is passed through the inside of the body 101 to be connected with the setting cone 201, and then the pull rod 302 is passed through the oil pipe 301 to be connected with the setting valve 202.

In this embodiment, the present application further provides a construction method using the packer, where the construction method includes:

S20: injecting the pressure liquid from the annular cavity;

S30: after the oil pipe 301 rises to a preset distance, the oil pipe 301 is lifted, and the oil pipe 301 drives the setting cone 201, the pull rod 302 and the setting valve 202 to rise together;

S40: connecting an inserting pipe 501 to the bottom of the second production pipe column, inserting the second production pipe column connected with the inserting pipe 501, and inserting the inserting pipe 501 into the hanging nipple 203.

Specifically, in step S10, a pressure fluid is first injected into an annular space between the casing a and the packer, where the predetermined amount of the pressure fluid is specifically 1.5 times to 2 times of the wellbore volume above the depth of the packer, and after the pressure fluid reaches the bottom of the setting valve 202, the pressure fluid enters the hollow cavity of the setting valve 202 through the filtering pipe 202b of the setting valve 202, and the hydraulic pressure can push the steel ball 204 to leave the ball seat 202c, so that the return circulation flow path is opened, and the pressure fluid enters the annular cavity through the bypass hole 202 a.

In step S20, after reverse circulation, forward pressurizing is performed instead, pressure fluid is injected into the annular cavity, the hydraulic pressure is transmitted to the outside of the oil pipe 301 through the inner space of the oil pipe 301, the steel ball 204 closes the return circulation flow channel under the action of the hydraulic pressure, and the hydraulic pressure finally acts on the top surface of the setting valve 202, the top surface of the hanging nipple 203 and the bottom surface of the setting cone 201. The pressure acting on the top surfaces of the setting valve 202 and the hanging nipple 203 can generate downward thrust, and the downward thrust cannot enable the setting valve 202 and the hanging nipple 203 to move downwards because the sealing seat 103 is fixed at the lower end of the body 101. The pressure acting on the bottom surface of the setting cone 201 will generate an upward thrust, pushing the setting cone 201 to move upward. Under the action of the thrust, the setting cone 201 presses the body 101, and when the thrust is greater than the yield limit of the material of the body 101, the body 101 expands to generate permanent deformation, and the sealing ring 102 on the outer wall of the setting section 101a is tightly pressed between the body 101 and the casing A along with the expansion of the body 101. When the setting cone 201 is pushed out of the top end of the body 101, the pressure suddenly drops to zero and the packer setting is completed. At this time, the inner diameter of the setting section 101a of the body 101 is the same as that of the expanding section 101c, the transition section 101b disappears, and the compressed sealing ring 102 performs the dual functions of sealing and suspending, as shown in fig. 3 and 4.

In step S30, after the setting cone 201 drives the oil pipe 301 to rise a predetermined distance, the oil pipe 301 is lifted up, the setting cone 201 rises with the oil pipe 301, because the outer diameter of the upper end of the pull rod 302 is larger than the inner diameter of the setting cone 201, the setting cone 201 will take the pull rod 302 and the setting valve 202 connected below the pull rod 302 to rise together, the hanging nipple 203 is not locked by the second locking member 402, and the hanging nipple 203 and the first production string connected below the hanging nipple 203 are still left downhole.

In step S40, after the packer is set, a second production string is run. Specifically, the second production string is connected with an oil well pump 6, and a splicing pipe 501 is connected below the oil well pump 6. After the oil well pump 6 is lowered to the designed depth by using the second production string, the insertion pipe 501 is inserted into the hanging nipple 203. The second production string is butted with the first production string through the splicing pipe 501 and the hanging nipple 203 to form a complete oil pumping production string. At the moment, the water outlet layer is separated from the oil well casing A, the hanging short section 203 and the body 101 of the packer, and the splicing pipe 501 and the hanging short section 203 by sealing, and oil in the oil layer enters the oil well pump 6 through the gas anchor 7 and is pumped out.

Specifically, as shown in fig. 5, the insertion tube 501 is a metal circular tube with a hollow cavity. The upper end of the insertion pipe 501 is provided with a threaded structure and can be connected with a second production pipe column, a clamp spring groove is formed in the outer wall of the insertion pipe 501 and used for installing the first locking member 401, and in this embodiment, the first locking member 401 does not need to be installed. The inner wall of the insertion tube 501 is provided with a positioning step 501a matched with the second limiting step 203 a. When the plugging pipe 501 is inserted into the hanging nipple 203, the butting is performed through the positioning step 501a and the second limiting step 203 a. A plurality of sealing rings can be arranged between the insertion pipe 501 and the hanging nipple 203, and a groove for accommodating the sealing rings is arranged on the inner wall of the insertion pipe 501.

as shown in figure 6, the complete production string formed by butting the first production string and the second production string is a split production string, and by adopting the split production string, the lower end of the hanging nipple 203 is connected with accessories which are long in service life and not easy to damage, such as a gas anchor 7, a bottom plug 8 and the like, before the packer is set. Therefore, if the pump 6 needs to be inspected, the second production string needs to be pulled out, so that the insertion pipe 501 and the pump 6 are pulled out at the same time, and the hanging nipple 203 and the accessories such as the first production string below remain downhole.

if the packer that this application embodiment provided adopts split type production tubular column to examine pump work, one can avoid the packer to play along with oil-well pump 6, and life cycle such as gas anchor 7, end stifled 8 is long, not fragile oil pumping annex can separate with the oil-well pump 6 that life cycle is short relatively, hangs below the packer, plays along with the pump when avoiding examining pump work. In addition, the second production string does not affect the operation of the packer during oil pumping operation, so that the failure of the packer caused by friction between the sealing ring 102 and the casing A can be avoided.

Based on the packer structure is adopted to separating that this application embodiment provided, this application embodiment still provides a salvage hang nipple 203's method.

If the integral production string as shown in fig. 7 is adopted, when the production string is put into the production string for oil pumping operation, the hanging nipple 203 is connected into the production string, and the production string is pulled out or put into the production string at each time, so that the problems of independent fishing and setting do not exist. But the adoption of the split type oil pumping pipe column is different.

As shown in fig. 6, when checking the pump, the plug pipe 501 is simply pulled out from the hanging nipple 203, the plug pipe 501 and the oil well pump 6 above the plug pipe are pulled out, and then the pump checking operation is performed, while the hanging nipple 203 and the accessories below the hanging nipple, such as the gas anchor 7, the bottom plug 8 and the like, are still left in the well. However, after several pump inspections, the accessories in the well may need to be repaired or replaced, or the well may need to be salvaged, repaired or replaced, and then the hanging nipple 203 is set again in due to the fact that sand needs to be flushed to the bottom of the well due to sand production in the oil reservoir.

During fishing, the fishing tool can be an oil pipe coupling fishing spear or an oil pipe sliding block fishing spear. Tubing collar spears are preferred in this implementation because they do not cause any damage to the hanging nipple 203. Specifically, the fishing tool is connected to the lowest part of the pipe column, the lowering speed is controlled when the fishing tool is lowered to 2-3 m from the top surface of the suspended nipple 203, the fishing tool slowly enters the suspended nipple 203, the predetermined bit pressure is added, the fishing tool is slowly lifted, and if the increase of the suspended weight reaches the weight of the pipe column below the suspended nipple 203, the fishing is successful. Otherwise, the fishing tool is lowered again, and the bit pressure can be slightly increased.

When the hanging short section 203 needs to be seated again, the first locking member 401 is installed in the clamp spring groove in the inner wall of the splicing pipe 501, and then the splicing pipe 501 is inserted into the hollow cavity of the hanging short section 203, so that the positioning step 501a of the splicing pipe 501 abuts against the second limiting step 203a of the hanging short section 203. At the same time, the first locking member 401 enters the first groove on the inner wall of the hanging nipple 203, and locks the splicing pipe 501 and the hanging nipple 203 together. Finally, a second retaining member 402 is mounted in a third recess in the outer wall of the hanging nipple 203. Grooves can be further formed in the inner wall of the inserting pipe 501 and the outer wall of the hanging nipple 203, and sealing rings are installed in the grooves.

the upper end of the plugging pipe 501 is connected with a pipe column, and the pipe column puts the assembled plugging pipe 501 and the hanging nipple 203 into the casing A. As shown in fig. 5, when the suspension assembly composed of the splicing pipe 501 and the suspension nipple 203 is lowered to 2m-3m above the packer, the lowering speed is controlled, so that the suspension assembly slowly enters the sealing seat 103. With a certain weight on bit, preferably 30KN, the weight on bit is transmitted to the plug tube 501 and further to the hanging nipple 203 through the positioning step 501a of the plug tube 501, so that the second locking member 402 is compressed and passes through the sealing seat 103. When the outer limit step 103b of the hanging nipple 203 is pressed on the first limit step 103a at the upper end of the sealing seat 103, the second locking member 402 simultaneously comes out from the lower end face of the sealing seat 103 and springs open, the outer protruding inclined plane of the second locking member leans against the inclined plane at the lower end of the sealing seat 103, the hanging assembly is locked in the packer, and the hanging nipple 203 is seated.

After the pipe string is lifted up after being seated, the lifting force acts on the plugging pipe 501, passes through the first locking member 401, and then passes to the hanging nipple 203 and the second locking member 402, that is, the lifting force acts on both the first locking member 401 and the second locking member 402. The first locking part 401 and the second locking part 402 are respectively small and large clamp springs, although the cross section shapes are the same, the cross section areas, the angles of the outward protruding inclined planes and the sizes of the inner diameter and the outer diameter are different, and the clamp springs with different locking forces can be designed by adjusting the three parameters.

In this embodiment, the locking force of the second locking member 402 can be designed to be 50kN, and the locking force of the first locking member 401 can be designed to be 10kN, which is different by 5 times. Therefore, after setting the suspension assembly, the pipe string is lifted up and the splicing tubing 501 can only be disconnected from the first retaining member 401 and not from the second retaining member 402, so that the suspension sub 203 remains in the packer under the action of the second retaining member 402. After the insertion pipe 501 is set to the ground, it is determined whether to replace the packing ring and the first locking member 401 according to the sound condition.

The packer is adopted to separate that this application embodiment provided is applicable to the operation occasion that requires to carry out reverse circulation, mainly possesses following advantage:

1. This separate and adopt packer setting back can realize the relative separation of production string and packer, can eliminate because of the production string wriggling and the outstanding two main factors that lead to the packer inefficacy of packing element shoulder, and the packer does not play along with the oil-well pump when examining the pump in addition, avoids changing passively.

2. this back circulation formula packer sits and seals the back, if adopt split type production tubular column to carry out oil recovery operation, the packer sits and seals the below of hanging the nipple joint and has been connected with life cycle such as gas anchor, end stifled long, not fragile oil pumping annex, if need inspect the oil-well pump, only need will hang the second production tubular column of nipple joint top and extract to annexs such as gas anchor, end stifled play along with the oil-well pump when avoiding examining pump operation.

3. If the integral pipe column is adopted for oil extraction operation, if the setting position of the packer influences the pump-down depth of the oil well pump, the oil well pump can be lowered below the packer for oil extraction, the submergence of the pump is increased, and the pump efficiency is improved.

the above embodiments are merely illustrative of the technical concepts and features of the present application, and the purpose of the present invention is to enable those skilled in the art to understand the content of the present application and implement the present application, and not to limit the protection scope of the present application. All equivalent changes and modifications made according to the spirit of the present application should be covered in the protection scope of the present application.

A plurality of elements, components, parts or steps can be provided by a single integrated element, component, part or step. Alternatively, a single integrated element, component, part or step may be divided into separate plural elements, components, parts or steps. The disclosure of "a" or "an" to describe an element, ingredient, component or step is not intended to exclude other elements, ingredients, components or steps.

it is to be understood that the above description is intended to be illustrative, and not restrictive. Many embodiments and many applications other than the examples provided will be apparent to those of skill in the art upon reading the above description. The scope of the present teachings should, therefore, be determined not with reference to the above description, but should instead be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are hereby incorporated by reference for all purposes. The omission in the foregoing claims of any aspect of subject matter that is disclosed herein is not intended to forego the subject matter and should not be construed as an admission that the applicant does not consider such subject matter to be part of the disclosed subject matter.

Claims

1. An isolation packer, comprising:

The body, the body is hollow body, has relative upper end and lower extreme, the body includes from the lower extreme to the upper end in proper order: the outer diameter of the diameter expanding section is larger than that of the setting section, and a plurality of sealing rings are annularly arranged on the outer wall of the setting section;

The pressure liquid can flow through the annular cavity and act on the bottom surface of the setting cone, the setting cone can slide from the diameter expanding section to the setting section through the transition section under the action of the pressure liquid, and the setting section and the sealing ring are both expanded;

The setting valve is provided with a hollow cavity which is communicated downwards, a ball seat and a steel ball are arranged in the setting valve, and the steel ball is arranged on the ball seat; the ball seat is characterized in that a bypass hole is formed in the hollow cavity of the seat sealing valve, the steel ball leaves the ball seat under the action of fluid, and the hollow cavity, the bypass hole and the annular cavity are communicated to form a reverse circulation flow channel.

2. The isolation and production packer as claimed in claim 1, wherein the lower end of the body is further provided with a sealing seat, the sealing seat is provided with a hollow cavity, a hanging nipple is arranged in the sealing seat, and a first limiting mechanism for limiting the hanging nipple to be separated from the lower end of the body is arranged between the sealing seat and the hanging nipple;

3. The isolation packer of claim 2, wherein the setting valve further comprises: the filter pipe is positioned at the lower part of the seat valve, a plurality of small holes are formed in the filter pipe, and the small holes are communicated with the hollow cavity of the seat valve.

4. the isolation and production packer of claim 1, wherein the pull rod is provided with a solid rod body, the lower end of the rod body is fixedly connected with the upper end of the setting valve, the upper end of the rod body is provided with a bulge, and the outer diameter of the bulge is larger than the inner diameter of the setting cone and smaller than the inner diameter of the oil pipe.

5. The isolation packer of claim 4, wherein a clearance between the outer diameter of the rod body and the inner diameter of the setting cone is not less than 6 mm.

6. The isolation packer of claim 2, wherein a first locking member is disposed between the hanging sub and the setting valve, wherein a first groove is disposed on an inner wall of the hanging sub, wherein a second groove is disposed on an outer wall of the setting valve, and wherein the first groove and the second groove cooperate to form a cavity for receiving the first locking member.

7. The isolation and production packer of claim 2, wherein a second retaining member is disposed between the suspension sub and the seal housing, and a third recess is disposed in an outer wall of the suspension sub for receiving the second retaining member.

8. the isolation packer of claim 6, wherein a second locking member is disposed between the hanging sub and the setting valve, the second locking member having a greater locking force than the first locking member; and a third groove for accommodating the second locking piece is formed in the outer wall of the hanging short section.

9. An isolation and production packer as claimed in claim 7 or 8, wherein the lower end of the hanging sub is fixedly connected with a first production string.