CN204532233U - Well cementation tubular column combination - Google Patents

Abstract

The utility model provides a cementing string combination, which includes a floating shoe, a floating hoop, a casing shut-in sliding sleeve, a hydraulic expansion packer and multiple casings; the floating shoe is placed on the cementing pipe The bottom end of the column combination; the floating hoop is placed on the upper end of the floating shoe, and the floating hoop and the floating shoe are connected by a casing; the casing shut-in sliding sleeve is placed on the upper end of the floating hoop, and the casing shut-in sliding sleeve and the floating hoop They are connected by casing; the hydraulic expandable packer is placed on the upper end of the casing shut-in sliding sleeve, and is connected with the casing shut-in sliding sleeve by casing. There is at least one set of hydraulic expandable packers, each The group contains two hydraulically expandable packers, one of which is placed at the lower end of the high-pressure water layer, and the other is placed at the upper end of the high-pressure water layer, and the hydraulically expandable packers are connected by casing; placed in the high-pressure water layer Casing is placed on the hydraulically expandable packer at the upper end of the well, and the casing is connected to the wellhead.

Description

Cementing string combination

technical field

The utility model relates to oil field cementing technology, in particular to a cementing string combination for improving cementing quality.

Background technique

Most of the oil and gas fields in my country are characterized by the development of multiple layers in the vertical direction of a single well, and with the expansion of exploration knowledge, more and more new oil and gas layers have been discovered in the lower part of the developed oil layers. become a geological consensus. However, since most oil fields in my country are developed by water injection, long-term water injection leads to high pressure and rich water in some oil layers.

Cementing is required when developing the lower strata. Cementing is to inject gelatinous slurry with a specific gravity higher than that of mud into the annular space between the outside of the well wall and the side of the well through the pipeline, and replace the mud from bottom to top and consolidate the well. The work of the wall. The cementing process is mainly divided into three steps: 1. Casing; 2. Cement injection; 3. Wellhead installation and casing pressure test. However, when the lower stratum is developed and cementing and completion are required, due to the high pressure of the upper pre-advance water injection development strata, the performance of the cement slurry cannot balance the formation pressure of the advance water injection formation, resulting in water intrusion into the cement slurry. Significant changes in the performance of cement slurry lead to poor cementing quality and poor packing performance in later fracturing, which affects the gas production effect.

At present, engineering and technical personnel at home and abroad mainly adjust the density of the upper cement slurry to achieve near-balanced formation pressure, and then to suppress the formation pressure and avoid water flow to improve the cementing quality. However, this method has the following disadvantages: first, if there is a leakage layer in the upper formation, the density of the cement slurry cannot expand infinitely, and the requirement of balancing formation pressure cannot be fulfilled; secondly, even if a near-equilibrium pressure with the formation is generated, formation fluid cannot be avoided. Infiltrate into the cement slurry, resulting in poor performance of the cement slurry and affecting the cementing quality.

Utility model content

The utility model provides a cementing pipe string combination, which can effectively seal off a high-pressure water layer and improve the cementing quality.

The utility model provides a cementing string combination, including: floating shoes, floating hoops, casing shut-in sliding sleeves, hydraulic expansion packers and multiple casings;

The floating shoe is placed at the bottom end of the cementing string combination;

The floating hoop is placed on the upper end of the floating shoe, and the floating hoop and the floating shoe are connected by a casing;

The casing shut-in sliding sleeve is placed on the upper end of the floating hoop, and the casing shut-in sliding sleeve and the floating hoop are connected by a casing;

The casing shut-in sliding sleeve includes a rubber plug whose diameter is smaller than the inner diameter of the casing shut-in sliding sleeve and the hydraulic expansion packer. Shut-in sliding sleeve for casing closure;

The hydraulically expandable packer is placed on the upper end of the casing shut-in sliding sleeve, and is connected with the casing shut-in sliding sleeve by a casing. There are at least one set of hydraulically expandable packers, and each set includes two hydraulically expandable packers. Type packers, one of which is placed at the lower end of the high-pressure water layer, and the other is placed at the upper end of the high-pressure water layer, and the hydraulic expansion packers are connected by casing;

A casing is placed on the hydraulically expandable packer placed on the upper end of the high-pressure water layer, one end of the casing is connected to the hydraulically expandable packer placed on the upper end of the high-pressure water layer, and the other end of the casing is connected to the wellhead.

In an embodiment of the present invention, a bumper is placed at one end of the aforementioned rubber plug.

In an embodiment of the present invention, the aforementioned casing shut-in sliding sleeve further includes: the inner shell of the sliding sleeve, the outer shell of the sliding sleeve, pins, and the main body of the sliding sleeve;

The thickness of the sliding sleeve body is greater than the thickness of any casing;

The sliding sleeve shell is placed in the sliding sleeve body, the sliding sleeve shell is connected with the sliding sleeve body, a circulation channel is placed in the sliding sleeve shell, and a circulation hole is placed on the side wall of the sliding sleeve shell, the circulation hole is connected with the circulation channel, and the sliding sleeve shell is placed There is a sealing ring, which is used to seal the outer casing of the sliding sleeve with the inner casing of the sliding sleeve;

The pin is placed between the outer casing of the sliding sleeve and the inner casing of the sliding sleeve, and is used for connecting the inner casing of the sliding sleeve and the outer casing of the sliding sleeve, so that the inner casing of the sliding sleeve is higher than the circulation hole.

In an embodiment of the present invention, there are two circulation holes.

In an embodiment of the present invention, the diameters of the aforementioned plurality of sleeves are the same.

In an embodiment of the present invention, the thickness of the sliding sleeve body is at least twice the thickness of the casing.

In an embodiment of the present utility model, the end of the sliding sleeve body close to the bottom end of the cementing string assembly is provided with threads, and the sliding sleeve body and the sliding sleeve casing are connected by threads.

In one embodiment of the present utility model, a centralizer is placed on the casing between the aforementioned floating hoop and the floating shoe to straighten the floating shoe and the floating hoop so that the combination of the floating shoe and the floating hoop to guide the cementing string is located in the middle of the wellbore.

In one embodiment of the present utility model, the aforementioned centralizer is a spring centralizer.

Compared with the prior art, the utility model has the beneficial effects that: the cementing string combination provided by the utility model can seal off the high-pressure water layer, prevent the water in the high-pressure water layer from penetrating into the cement slurry, and ensure The performance of the cement slurry does not change, thereby improving the cementing quality.

Description of drawings

Fig. 1 is a schematic diagram of the combined structure of the cementing string provided by an embodiment of the utility model;

Fig. 2 is a schematic diagram of the combined structure of the cementing string provided by the hydraulically expandable packer set according to an embodiment of the present invention;

Fig. 3 is a schematic diagram of the combined structure of the cementing string provided by another embodiment of the present invention;

Fig. 4A and Fig. 4B are schematic diagrams of the casing shut-in sliding casing shut-in process provided by the utility model;

Fig. 5 is a structural schematic diagram of the casing shut-in sliding sleeve provided by the utility model;

Fig. 6 is a structural schematic diagram of the casing shut-in sliding sleeve shut-in well provided by the utility model;

Fig. 7 is a schematic diagram of the combined structure of the cementing string set by the hydraulically expandable packer provided by another embodiment of the present invention;

Fig. 8 is a flowchart of a cementing method provided by an embodiment of the present invention.

Explanation of reference signs:

1- Floating shoe; 2- Centralizer; 3- Floating hoop;

4-casing shut-in sliding sleeve; 5-casing; 6-hydraulic expansion packer;

7-Rubber plug; 8-Sliding sleeve inner shell; 9-Sliding sleeve outer shell;

10-pin; 11-circulation hole; 12-sliding sleeve body;

71-bump head.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the utility model more clear, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the utility model. Obviously, the described The embodiments are some embodiments of the present utility model, but not all embodiments. 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.

Fig. 1 is a schematic diagram of the combined structure of the cementing string provided by an embodiment of the utility model, and Fig. 2 is a schematic diagram of the combined structure of the cemented string provided by a hydraulically expandable packer set according to an embodiment of the utility model. As shown in Figure 1 and Figure 2, the utility model provides a cementing string combination, including: floating shoe 1, floating hoop 3, casing shut-in sliding sleeve 4, hydraulic expansion packer 6 and multiple sleeves Tube 5.

The floating shoe 1 is placed at the bottom end of the cementing string assembly; the floating hoop 3 is placed at the upper end of the floating shoe 1, and the floating hoop 3 and the floating shoe 1 are connected by casing.

Specifically, the matching placement of the floating hoop 3 and the floating shoe 1 can guide the cementing string combination to go down the wellbore smoothly to the bottom of the well. Sleeve connection is adopted between the floating hoop 3 and the floating shoe 1, and a certain distance is reserved between the floating shoe 1 and the floating hoop 3 to facilitate the passage of liquid lumps. The multiple casing pipes 5 have the same diameter, and this embodiment does not limit the number and length of the casing pipes, and the specific number and length can be determined according to the actual drilling conditions. It should be noted that the specific structure and basic principle of the floating shoe 1 and floating hoop 3 provided in this embodiment are the same as those of the prior art floating shoe and floating hoop 3 , and will not be repeated here.

Optionally, a centralizer 2 is placed on the casing between the floating hoop 3 and the floating shoe 1, and the centralizer 2 is used to straighten the floating shoe 1 and the floating hoop 3 so that the floating shoe 1 and the floating hoop 3 guide the combination of the cementing string Located in the middle of the shaft. Specifically, the centralizer 2 is a spring centralizer.

The casing shut-in sliding sleeve 4 is placed on the upper end of the floating hoop 3, and the casing shut-in sliding sleeve 4 and the floating hoop 3 are connected by a casing.

The casing shut-in sliding sleeve 4 includes a rubber plug 7. The diameter of the rubber plug 7 is smaller than the inner diameter of the casing shut-in sliding sleeve 4 and the hydraulically expandable packer 6, and is used to replace the liquid in the cementing string assembly and run to The casing shut-in sliding sleeve 4 closes the casing shut-in sliding sleeve 4 .

Specifically, after the cement slurry is injected into the cementing string assembly, the rubber plug 7 is put into the cementing string assembly from the wellhead, and the rubber plug 7 squeezes the cement slurry in the cementing string assembly into the cementing string assembly In addition, the cement slurry flows into the space between the cementing string assembly and the well wall, and the rubber plug 7 replaces the cement slurry in the cementing string assembly and runs to the casing shut-in sliding sleeve 4 to close the casing shut-in sliding sleeve 4 . The diameter of the rubber plug 7 is smaller than the inner diameters of the casing shut-in sliding sleeve 4 and the hydraulically expandable packer 6 to ensure that the rubber plug 7 can run to the casing shut-in sliding sleeve 4 . It should be noted that the liquid in the string assembly in this embodiment is not limited to cement slurry, and may also be spacer fluid.

The hydraulically expandable packer 6 is placed on the upper end of the casing shut-in sliding sleeve 4, and is connected with the casing shut-in sliding sleeve 4 by a casing. The hydraulically expandable packer 6 is at least one group, and each group includes Two hydraulically expandable packers 6, one of which is placed at the lower end of the high-pressure water layer, and the other is placed at the upper end of the high-pressure water layer, and the hydraulically expandable packers 6 are connected by sleeves.

Specifically, there are at least one group of hydraulically expandable packers 6, and each group contains two hydraulically expandable packers 6, one of which is placed at the lower end of the high-pressure water layer, and the other is placed at the upper end of the high-pressure water layer to ensure When the hydraulic expandable packer 6 is set, the hydraulically expandable packer 6 placed at the lower end of the high-pressure water layer expands and sticks to the well wall at the lower end of the high-pressure water layer, and the hydraulically expandable packer placed at the upper end of the high-pressure water layer 6. Expansion is attached to the well wall at the upper end of the high-pressure water layer, so that the upper end of the high-pressure water layer and the lower end of the high-pressure water layer are sealed, thereby achieving the isolation of the high-pressure water layer. The number and length of the casing between the hydraulically expandable packer 6 and the casing between the hydraulically expandable packer 6 and the casing shut-in sliding sleeve 4 can be adjusted to ensure that two hydraulically expandable packers in each group One of the spacers 6 is placed at the lower end of the high-pressure water layer, and the other is placed at the upper end of the high-pressure water layer. It should be noted that the specific structure and realization principle of the hydraulically expandable packer 6 in this embodiment are the same as those of the hydraulically expandable packer in the prior art, and will not be repeated here.

A casing is placed on the hydraulic expandable packer 6 placed on the upper end of the high-pressure water layer, one end of the casing is connected to the hydraulically expandable packer 6 placed on the upper end of the high-pressure water layer, and the other end of the casing is connected to the wellhead .

It should be noted that the floating shoe 1, the floating hoop 3, the casing shut-in sliding sleeve 4, several casings 5, and the hydraulically expandable packer 6 in the cementing string combination provided in this embodiment are all independent. In actual use, it is only necessary to connect the floating shoe 1, the floating hoop 3, the casing shut-in sliding sleeve 4, several casings 5, and the hydraulically expandable packer 6 according to the combination requirements of the cementing string.

During the actual use of the cementing string assembly provided in this example, the floating shoe 1 and the floating hoop 3 guide the cementing string assembly down to the designated position at the bottom of the well; inject grout into the cementing string assembly, and place the rubber plug 7 Put it into the cementing string assembly from the wellhead, and start the replacement construction, so that the cement slurry is replaced from the bottom to the top of the cementing string assembly; Well sliding sleeve 4; the lower end of the casing shut-in sliding sleeve 4 is closed and suppressed, the hydraulic expansion packer 6 is under pressure, and the hydraulic expansion packer 6 is set and sealed, and the hydraulic expansion packer placed at the lower end of the high-pressure water layer The spacer 6 is expanded and attached to the well wall at the lower end of the high-pressure water layer, and the hydraulically expandable packer 6 placed at the upper end of the high-pressure water layer is expanded and attached to the well wall at the upper end of the high-pressure water layer, so that the gap between the upper end of the high-pressure water layer and the lower end of the high-pressure water layer The space is sealed to isolate the high-pressure water layer.

The cementing string assembly provided in this embodiment guides the cementing string assembly down to the designated position at the bottom of the well through the floating shoe 1 and the floating hoop 3. During the replacement construction, the rubber plug 7 replaces and runs to the casing shut-in sliding sleeve 4 Closing the casing shut-in sliding sleeve 4, the lower casing of the casing shut-in sliding sleeve 4 is closed and suppressed, the hydraulic expansion packer 6 is under pressure, and the hydraulic expansion packer 6 is set to seal off the high-pressure water layer, improving Cementing quality.

Fig. 3 is a schematic diagram of the combined structure of the cementing string provided by another embodiment of the utility model; Fig. 4A and Fig. 4B are schematic diagrams of the casing shut-in sliding sleeve shut-in process provided by the utility model; Schematic diagram of the structure of the casing shut-in sliding sleeve, Fig. 6 is a structural schematic diagram of the casing shut-in sliding sleeve provided by the utility model, and Fig. 7 is a hydraulic expansion packer setting provided by another embodiment of the utility model Schematic diagram of the cementing string combination structure. As shown in Fig. 3, Fig. 4A, Fig. 4B, and Fig. 5-7, the cementing string composite casing shut-in sliding sleeve 4 provided by the utility model also includes: a sliding sleeve inner shell 8, a sliding sleeve outer shell 9, and a pin 10 , Sliding sleeve body 12.

The thickness of the sliding sleeve body 12 is greater than the thickness of any casing; the sliding sleeve shell 9 is placed in the sliding sleeve body 12, the sliding sleeve shell 9 is connected with the sliding sleeve body 12, and a circulation channel is placed in the sliding sleeve shell 9, and the sliding sleeve A circulation hole 11 is placed on the side wall of the casing 9, and the circulation hole 11 is connected with the circulation channel, and a sealing ring is placed on the casing 9 of the sliding casing, which is used to seal the casing 9 of the sliding casing and the inner casing 8 of the sliding casing; the pin 10 is placed in the sliding casing Between the outer shell 9 and the sliding sleeve inner shell 8, it is used to connect the sliding sleeve inner shell 8 and the sliding sleeve outer shell 9, so that the sliding sleeve inner shell 8 is higher than the circulation hole 11.

Optionally, a bumper head 71 is placed at one end of the rubber plug 7; there are two circulation holes 11, and the thickness of the sliding sleeve body 12 is at least twice the thickness of the casing; the end of the sliding sleeve body 12 is close to the bottom end of the cementing string assembly Threads are placed, and threaded connection is adopted between the sliding sleeve body 12 and the sliding sleeve housing 9 .

Specifically, the thickness of the sliding sleeve body 12 is greater than that of any one of the sleeves, so as to ensure that the sliding sleeve body 12 has sufficient pressure bearing capacity. A bumper 71 is placed at one end of the rubber plug 7, so that when the rubber plug 7 runs to the casing shut-in sliding sleeve 4, the bumper 71 at the front end of the rubber plug 7 is matched with the inner shell 8 of the sliding sleeve to realize bumping, and the connecting slide is cut off. The pin 10 of the sleeve inner shell 8 and the sliding sleeve outer shell 9, the sliding sleeve inner shell 8 descends to the circulation channel, blocks the circulation hole 11 on the circulation channel, and closes the casing and the sliding sleeve 4 .

During the actual use of the cementing string assembly provided in this example, the floating shoe 1 and the floating hoop 3 guide the cementing string assembly down to the designated position at the bottom of the well; inject grout into the cementing string assembly, and place the rubber plug 7 Put it into the cementing string assembly from the wellhead, and start the replacement construction, so that the cement slurry is replaced from the bottom to the top of the cementing string assembly; The bumper head 71 is matched with the sliding sleeve inner shell 8 to realize bumping, and the pin 10 connecting the sliding sleeve inner shell 8 and the sliding sleeve outer shell 9 is cut off, and the sliding sleeve inner shell 8 goes down to the circulation channel, blocking the circulation hole 11 on the circulation channel , close the casing shut-in sliding sleeve 4; the lower end of the casing shut-in sliding sleeve 4 is closed and suppressed, the hydraulic expandable packer 6 is under pressure, and the hydraulic expandable packer 6 is set and placed at the lower end of the high-pressure water layer The hydraulically expandable packer 6 is expanded and attached to the well wall at the lower end of the high-pressure water layer, and the hydraulically expandable packer 6 placed at the upper end of the high-pressure water layer is expanded and attached to the well wall at the upper end of the high-pressure water layer, so that the upper end of the high-pressure water layer is in contact with the well wall at the upper end of the high-pressure water layer. The lower ends of the high-pressure water layers are sealed to isolate the high-pressure water layers.

The cementing string assembly provided in this embodiment, on the basis of the above-mentioned embodiments, is shut in by placing the casing. The sliding sleeve includes the inner casing 8, the outer casing 9, the pin 10, the main body 12 of the sliding sleeve, and the rubber plug. 7 is placed at one end with a bumper head 71, so that during the replacement operation, the rubber plug 7 replaces and runs to the casing shut-in sliding sleeve 4, and the bumper head 71 at the front end of the rubber plug 7 is matched with the inner casing 8 of the sliding sleeve to realize bumping and shearing. The pin 10 connecting the sliding sleeve inner shell 8 and the sliding sleeve outer shell 9, the sliding sleeve inner shell 8 goes down to the circulation channel, blocks the circulation hole 11 on the circulation channel, closes the casing shut-in sliding sleeve 4, and the casing shut-in sliding sleeve 4 The casing at the lower end is closed to suppress the pressure, the hydraulically expandable packer 6 bears pressure, and the hydraulically expandable packer 6 is set, which can effectively seal off the high-pressure water layer and improve the cementing quality.

Fig. 8 is a flow chart of the cementing method provided by an embodiment of the utility model. As shown in Fig. 8, the cementing method provided by the utility model adopts the cementing string combination as in any of the above-mentioned embodiments for cementing, including :

S801: Lowering the cementing string combination to the bottom of the well;

Specifically, the floating shoes 1 and the floating hoops 3 are placed together in the cementing string assembly to guide the cementing string assembly to smoothly go down the wellbore to the designated position at the bottom of the well.

Optionally, running the cementing string assembly to the bottom of the well specifically includes: centering the cementing string assembly in the wellbore.

Specifically, the centralizer 2 placed on the casing between the floating shoe 3 and the floating hoop 1 is used to straighten the floating shoe 1 and the floating hoop 3, so that the floating shoe 1 and the floating hoop 3 guide the cementing string combination to be located in the middle of the wellbore.

S802: injecting cement slurry into the cementing string combination;

Specifically, the cement pump truck on the wellhead injects cement slurry into the cementing string assembly. It should be noted that the specific process of injecting cement slurry into the cementing string assembly by the cement pump truck in this embodiment is the same as that in the prior art, and will not be repeated here.

Optionally, before injecting the cement slurry into the cementing string combination, the method further includes: injecting spacer fluid into the cementing string combination. Ensure that the cementing string assembly is clean before injecting the cementing string assembly into the cementing string assembly, so that the cementing and displacing the cementing string can be performed more effectively.

S803: Put the rubber plug 7 from the wellhead into the cementing string assembly, and start the displacement construction, so that the cement slurry is displaced from the cementing string assembly from bottom to top;

S804: The rubber plug 7 replaces and runs to the casing shut-in sliding sleeve 4, and closes the casing shut-in sliding sleeve 4;

Specifically, closing the casing and shutting in the sliding sleeve 4 specifically includes: the rubber plug 7 replaces and runs to the casing closing sliding sleeve 4, the bump head 71 at the front end of the rubber plug 7 collides with the sliding sleeve inner shell 8, and the connecting sliding sleeve is cut off. The pin 10 of the sleeve inner shell 8 and the sliding sleeve outer shell 9, the sliding sleeve inner shell 8 descends to the circulation channel, blocks the circulation hole 11 on the circulation channel, and closes the casing and the sliding sleeve 4 .

S805: Casing shut-in sliding sleeve 4 The casing at the lower end is sealed and suppressed, hydraulic pressure is added from the cementing string combination, the hydraulic expansion packer 6 is under pressure, the pressure difference is generated from the upper and lower sides of the cementing string combination, and the hydraulic expansion type is set Packer 6, the hydraulically expandable packer 6 expands to the well wall, and the hydraulically expandable packer 6 placed at the lower end of the high-pressure water layer in each group expands and sticks to the lower end of the high-pressure water layer. Well wall, the hydraulically expandable packer 6 placed on the upper end of the high-pressure water layer expands and sticks to the well wall at the upper end of the high-pressure water layer, sealing the upper end of the high-pressure water layer and the lower end of the high-pressure water layer, sealing the high-pressure water layer, and waiting for solidification .

In the cementing method provided in this embodiment, the cementing string combination as in any of the above-mentioned embodiments is used for cementing, and the floating shoe 1 and the floating hoop 3 are used to guide the cementing string combination down to the designated position at the bottom of the well. , the rubber plug 7 replaces and runs to the casing shut-in sliding sleeve 4 to close the casing shut-in sliding sleeve 4, the lower end of the casing shut-in sliding sleeve 4 closes and suppresses pressure, and the hydraulic expansion packer 6 bears pressure and sets The hydraulic expansion packer 6 seals off the high-pressure water layer and improves the cementing quality.

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 (9)

1. a well cementing pipe column combination, is characterized in that, comprising: float shoe, float collar, sleeve pipe closing well sliding sleeve, hydraulic expanding packer and Duo Gen sleeve pipe;

Described float shoe is placed on the lowermost end of described well cementing pipe column combination;

Described float collar is placed on the upper end of described float shoe, is connected between described float collar with described float shoe by sleeve pipe;

Described sleeve pipe closing well sliding sleeve is placed on the upper end of described float collar, and described sleeve pipe closing well sliding sleeve is connected by sleeve pipe with between described float collar;

Described sleeve pipe closing well sliding sleeve comprises plug, the diameter of described plug is less than the internal diameter of described sleeve pipe closing well sliding sleeve and described hydraulic expanding packer, for the liquid that replaces in described well cementing pipe column combination and move to described sleeve pipe closing well sliding sleeve place and close described sleeve pipe closing well sliding sleeve;

Described hydraulic expanding packer is positioned over the upper end of described sleeve pipe closing well sliding sleeve, be connected by sleeve pipe with between described sleeve pipe closing well sliding sleeve, described hydraulic expanding packer is at least one group, often comprise two described hydraulic expanding packers in group, one of them is positioned over the lower end of high pressure water layer, another is positioned over the upper end of high pressure water layer, is connected between described hydraulic expanding packer by sleeve pipe;

Sleeve pipe placed by the described hydraulic expanding packer being positioned over the upper end of high pressure water layer, and one end of described sleeve pipe is connected with the described hydraulic expanding packer being positioned over the upper end of high pressure water layer, and the other end of described sleeve pipe is connected to well head.

2. well cementing pipe column combination according to claim 1, is characterized in that, described plug one end is placed with bruising head.

3. well cementing pipe column combination according to claim 2, is characterized in that, described sleeve pipe closing well sliding sleeve also comprises: sliding sleeve inner casing, sliding sleeve shell, pin, sliding sleeve body;

The thickness of described sliding sleeve body is greater than the thickness of arbitrary described sleeve pipe;

Described sliding sleeve shell is positioned in described sliding sleeve body, described sliding sleeve shell is connected with described sliding sleeve body, circulation canal is placed with in described sliding sleeve shell, described sliding sleeve side wall of outer shell is placed with circulation port, described circulation port is connected with described circulation canal, described sliding sleeve shell is placed with joint ring, for described sliding sleeve shell and described sliding sleeve inner casing being tightly connected;

Described pin is positioned between described sliding sleeve shell and described sliding sleeve inner casing, for connecting described sliding sleeve inner casing and described sliding sleeve shell, makes described sliding sleeve inner casing higher than described circulation port.

4. well cementing pipe column combination according to claim 3, is characterized in that, described circulation port is 2.

5. well cementing pipe column combination according to claim 4, is characterized in that, the diameter of described many sleeve pipes is identical.

6. well cementing pipe column combination according to claim 5, is characterized in that, the thickness of described sliding sleeve body is at least 2 times of casing thickness.

7. well cementing pipe column combination according to claim 6, is characterized in that, described sliding sleeve body is placed with screw thread near one end of described well cementing pipe column combination bottom, adopts and be threaded between described sliding sleeve body with described sliding sleeve shell.

8. well cementing pipe column combination according to claim 1, it is characterized in that, between described float collar and described float shoe, centralizer placed by sleeve pipe, for float shoe described in righting and described float collar, make described float shoe and described float collar guide described well cementing pipe column combination to be positioned in the middle of pit shaft.

9. well cementing pipe column combination according to claim 8, is characterized in that, described centralizer is spring centralizer.