CN203685094U - Long-section casing damage well expansion pipe multi-card casing layered isolation repair device - Google Patents

Abstract

The utility model provides a long-section casing damaged well expansion pipe multi-card casing layered isolation repair device, the device includes an expansion pipe group and a center pipe that can slide into the expansion pipe group, and the center The tube has an axial through cavity, the expansion tube group is formed by connecting at least three expansion tubes and sleeves alternately, a sleeve is connected between two adjacent expansion tubes, and the two expansion tube groups The end is an expansion tube, the bottom end of the expansion tube group is provided with a bottom plug, the bottom end of the central tube is connected with an expanding cone with an axial passage, and the through cavity of the central tube is formed with the axial passage of the expanding cone. The infusion channel runs through up and down, and the expansion cone can be placed at the upper end of the bottom plug. The utility model has a simple structure and can meet the suspension force and sealing requirements of long-section casing damaged well operations; for different layers of the wellbore that need to be separated and sealed, it can realize layered separation and sealing, and separate different layers independently, effectively It is beneficial to subsequent layered water injection or oil recovery.

Description

Long-section casing damage well expansion pipe multi-card casing layered isolation repair device

technical field

The utility model relates to an expansion pipe in the petroleum industry, in particular to a multi-card casing layered isolation repair device for a long-section casing damaged well expansion pipe used in drilling, well completion, oil production and workover.

Background technique

After a long period of production in the oil field, due to the influence of complex faults, abnormal ground stress, salt-gypsum layer, high salinity formation water, and measures to increase production and injection, oil and water well casings will be damaged to varying degrees, and many casings The pipe damages the well, seriously affects the survival and development of the oil field, and brings huge economic losses to the oil field exploitation.

For repairing wells with casing damage, there are methods such as mechanical shaping, chemical repairing technology, expansion pipe subsidy technology and so on. Among them, the expansion pipe subsidy technology is a new technology that has been booming in recent years to effectively repair damaged casings. It can be applied to drilling, well completion, oil production, workover and other operations.

The expansion pipe and casing subsidy technology is to lower a section of pipe string with good ductility into the damaged oil and gas well casing. After anchoring, the high-pressure working fluid is used to drive the expansion cone to expand the pipe string from bottom to top. The permanently deformed pipe string is tightly attached to the outer casing, and there are sealing elements at both ends, which are squeezed tightly on the outer casing together with the expansion tube to ensure that the pipe string can completely seal the leaking casing after expansion.

Although the subsidy length of the expansion tube technology is not limited, for long-segment damaged wells, all of them are repaired with expansion tube subsidy, which is technically difficult, risky and costly. Conventional overhaul technology is difficult to repair. After the repair, the borehole is small and the sealing effect is not good. Different layers of the borehole cannot be separated and sealed by layers, and the layers cannot be independent.

Utility model content

Aiming at the above-mentioned problems in the prior art, the purpose of this utility model is to propose a long-section casing damage well expansion pipe multi-barrel casing layered isolation repair device, which has a simple structure and can meet the requirements of the long-section casing damage operation on the suspension force and Sealing requirements; for different layers of the wellbore that need to be separated and sealed, layered separation and sealing can be achieved, and different layers are separated, which is beneficial to subsequent layered water injection or oil recovery.

In order to achieve the above purpose, the utility model proposes a long-section casing damage well expansion tube multi-card casing layered isolation repair device, the device includes an expansion tube group and a center that can slidably extend into the expansion tube group tube, the central tube has an axial through cavity, the expansion tube group is formed by connecting at least three expansion tubes and sleeves alternately, a sleeve is connected between two adjacent expansion tubes, and the Both ends of the expansion tube group are expansion tubes, the bottom end of the expansion tube group is provided with a bottom plug, the bottom end of the central tube is connected with an expansion cone with an axial passage, and the through cavity of the central tube is connected to the expansion cone. The axial channel forms an infusion channel through up and down, and the expanding cone can be placed at the upper end of the bottom plug.

Preferably, the casing is a collarless casing.

Preferably, the expansion tube group is formed by alternately connecting three expansion tubes and two collarless sleeves, and the three expansion tubes are respectively an upper expansion tube, a middle expansion tube, and a lower expansion tube, The two coupling-free casings are respectively an upper coupling-free casing and a lower coupling-free casing, the upper coupling-free casing connects the upper expansion tube and the middle expansion tube, and the lower coupling-free casing connects the upper expansion tube and the middle expansion tube A collar sleeve connects the middle expansion tube and the lower expansion tube.

Preferably, the bottom plug is placed at the lower end of the lower expansion tube and the lower end of the lower expansion tube is screwed to the lower end of the bottom plug.

Preferably, the expansion pipe and the collarless casing are connected by variable snap joints.

Preferably, the variable snap joint is threadedly connected to the expansion pipe and the collarless casing.

Preferably, the bottom end of the central tube is connected to the expander through a snap ring.

Preferably, an inner sealing groove is provided on the inner side wall of the expanding cone, and an inner sealing ring is arranged in the inner sealing groove.

Preferably, an outer sealing groove is provided on the outer wall of the expanding cone, and an outer sealing ring is arranged in the outer sealing groove.

Preferably, a bottom plug sealing groove is opened on the outer wall of the bottom plug, and a bottom plug sealing ring is arranged in the bottom plug sealing groove.

It can be seen from the above structure that in the above-mentioned long-section casing damage well expansion tube multi-tube layered isolation repair device, the upper uncoupled casing and the lower uncoupled casing are connected by the upper expansion tube, the middle expansion tube and the lower expansion tube. The casing is suspended in the long-section casing damage well, with both ends sealed and both ends suspended, so that the suspension force and sealing performance of the long-section casing damage well repair are guaranteed. The expansion pipe subsidy technology and the casing secondary completion technology are effectively implemented combined.

Secondly, for long-section casing damage wells with many layers, the formation pressure and interlayer conditions are different in different layers, and interlayer leakage is easy to occur. When using the long-section casing damage well expansion pipe multi-card casing layered isolation repair device of the utility model to repair long-section casing damage wells with many layers, casing damage wells in different layers can correspond to different expansion pipes, which can Realize layered separation and sealing, so that different layers are independent of each other, effectively avoiding leakage between different layers. At the same time, if water injection or oil production is required for different layers in the future, the expansion pipes corresponding to the corresponding layers can be opened to perform layered water injection or oil production.

In addition, the device of the present utility model can adjust the position of the device of the present utility model according to the production requirements of the oil field, combined with the drilling and completion of a single well location, and can also increase or decrease the number of expansion tubes in the expansion tube group of the present utility model according to the production requirements , so as to adjust the length of the repair device of the present utility model to meet the needs of different repair lengths.

Furthermore, the device of the utility model has a simple structure and a simple and convenient construction method, and the expansion can be completed by using one expansion cone for the three expansion tubes.

Finally, the size of the wellbore repaired by the device of the utility model can meet the normal production requirements of the oil field, and the construction risk is low, the cost is low, and it has strong market competitiveness.

Description of drawings

Fig. 1 is the structural representation of the utility model device;

Fig. 2 is a partial schematic diagram of the connection between the upper expansion tube of the utility model device and the upper collarless casing;

Fig. 3 is a partial schematic view of the connection between the coupling-free casing and the middle expansion tube on the device of the present invention;

Fig. 4 is a partial schematic view of the connection between the expansion tube and the lower collarless casing in the device of the present invention;

Fig. 5 is a partial schematic diagram of the connection between the lower collarless sleeve and the lower expansion tube of the device of the present invention;

Fig. 6 is a partial schematic view of the bottom plug of the device of the present invention and the connection between the center pipe and the expansion cone.

Explanation of reference signs:

1-central tube, 2-expanding cone, 21-inner sealing groove, 22-outer sealing groove, 3-upper expansion tube, 4-upper sleeve without coupling, 5-middle expansion tube, 6-lower coupling sleeve Tube, 7-lower expansion tube, 8-bottom plug, 81-bottom plug sealing groove, 9-circlip, 34, 45, 56, 67-variable buckle joints.

Detailed ways

In order to have a clearer understanding of the technical features, purposes and effects of the utility model, the specific implementation of the utility model is now described with reference to the accompanying drawings.

The utility model proposes a long-section casing damage well expansion tube multi-card casing layered isolation repair device, as shown in Figures 1-6, the utility model includes an expansion tube group and a slidable ground Extending into the central tube 1 of the expansion tube group, the central tube 1 has an axial through cavity, and the expansion tube group is formed by connecting at least three expansion tubes and sleeves alternately, between two adjacent expansion tubes A casing is connected between them, and the two ends of the expansion tube group are expansion tubes, so as to realize sealing at both ends and suspension at both ends. The bottom plug 8 is arranged at the bottom end of the expansion tube group, that is, the bottom plug 8 is located at the bottom of the The bottom end of the expansion tube at the bottom of the expansion tube group; the bottom end of the central tube 1 is connected with the expansion cone 2, and the expansion cone 2 has an axial channel, and the through cavity of the central tube 1 and the axial channel of the expansion cone 2 form an up and down infusion aisle. There is a certain gap between the outer wall of the central tube 1 and the inner wall of the expansion tube group, so that the central tube 1 and the expansion tube group can slide relative to each other. When the central pipe 1 slides into the expansion pipe group, the expansion cone 2 can be placed on the upper end of the bottom plug 8 .

In order to enlarge the inner diameter of the pipe string repaired by the utility model, the casing is preferably a casing without a collar. In a specific embodiment of the present utility model, when the casing to be repaired is 51/2", the wall thickness of the casing is 7.72mm, and the inner diameter is 124.3mm. A 41/2" non-coupling casing can be selected, and its inner diameter is about 100mm. 41/2", effectively expanding the internal diameter of the repaired pipe string.

Take the expansion tube group consisting of three expansion tubes and two collarless sleeves alternately connected as an example to illustrate the connection of the expansion tube group, as shown in Figures 1-6, the expansion tube consists of the upper expansion tube 3, The upper non-coupling casing 4, the middle expansion pipe 5, the lower non-coupling casing 6 and the lower expansion pipe 7 are sequentially connected. In the actual use process, the length of the closed wellbore can be separated according to the needs, the appropriate number of expansion pipes and casings without couplings can be selected, and the expansion pipe group can be formed by connecting them alternately.

In order to meet the connection between expansion tubes of different types and the coupling-free casing and the tightness of the connection, the upper expansion tube 3 and the upper coupling-free casing 4 are connected using the variable buckle joint 34, and the upper coupling-less casing is connected using the variable buckle joint 45. The hoop casing 4 and the middle expansion pipe 5 are connected with the middle expansion pipe 5 and the lower non-coupling casing 6 by using the variable buckle joint 56, and the lower non-coupling casing 6 and the lower expansion pipe 7 are connected by using the variable buckle joint 67. Preferably, the variable buckle joints are connected with each expansion pipe and each collarless casing through threaded connection, which is convenient and has strong sealing performance. In a preferred embodiment, the connection between the lower expansion tube 7 and the bottom plug 8 of the expansion tube set can also be screwed. In order to improve the tightness between the inner side wall of the lower expansion tube 7 and the outer side wall of the bottom plug 8, the outer side wall of the bottom plug 8 is provided with a bottom plug sealing groove 81, and an outer sealing ring is arranged in the bottom plug sealing groove 81.

During the expansion process of the expansion tube group, the central tube 1 is lifted to drive the expansion cone 2, and the connection between the central tube 1 and the expansion cone 2 needs to be able to withstand a certain lifting force. The lower end of the central tube 1 of the utility model It is connected with the expansion cone 2 through the circlip 7 to meet the requirement of lifting force between the two. And in order to improve the tightness of the joint interface between the central tube 1 and the expander 2, the inner wall of the expander 2 connected to the central tube 1 can be provided with an inner sealing groove 21, and an inner sealing ring is arranged in the inner sealing groove 21.

The central tube 1 can slide into the expansion tube group, and the outer wall of the expansion cone 2 is connected to the inner wall of the lower expansion tube 7. In order to improve the sealing performance of the interface between the expansion cone 2 and the lower expansion tube 7, the expansion cone The outer wall of 2 is provided with an outer sealing groove 22, and an outer sealing ring is arranged in the outer sealing groove 22.

In the above-mentioned long-section casing damage well expansion tube multi-casing layered isolation repair device, the upper uncoupled casing 4 and the lower uncoupled casing are connected through the upper expansion tube 3, the middle expansion tube 5 and the lower expansion tube 7. The pipe 6 is suspended in the long-section casing damage well, with both ends sealed and both ends suspended, so that the suspension force and sealing performance of the long-section casing damage well repair are guaranteed. The expansion pipe subsidy technology and the casing secondary completion technology are effectively implemented combined.

The following is an example to illustrate the working principle of a long-section casing damage well expansion pipe multi-card casing layered isolation repair device of the present invention, as shown in Figure 1:

Step a, inserting the expansion cone 2 into the bottom of the lower expansion tube 7, and then inserting the bottom plug 8 into the bottom end of the lower expansion tube 7 and the upper end of the expansion cone 2;

Step b, connect the lower end of the lower collarless casing 6 and the upper end of the lower expansion tube 7 through the variable button joint 67, connect the lower end of the middle expansion tube 5 and the upper end of the lower collarless casing 6 through the variable button joint 56, and pass The variable buckle joint 34 connects the lower end of the upper expansion tube 3 and the upper end of the upper collarless casing 4, the upper expansion tube 3, the upper couplingless casing 4, the middle expansion tube 5, the lower couplingless casing 6 and the lower expansion tube. The tube 7 forms an expansion tube group;

Step c, inserting the central tube 1 into the expansion tube group, and docking the expansion cone 2 through the circlip 9, the central tube 1 and the expansion cone 2 form an infusion channel connecting up and down;

Step d, lowering the device assembled in step c into the well to reserve a repair position;

In step e, the working fluid is injected at high pressure through the infusion channel of the central tube 1 and the expansion cone 2. After the high-pressure working fluid fills the bottom plug 8, the working fluid level continues to rise. Since the maximum outer diameter of the expansion cone 2 is larger than that of the lower expansion tube 7 , the inner diameter of the middle expansion tube 5 and the upper expansion tube 3, the expansion cone 2 goes up and passes through the lower expansion tube 7, so that the lower expansion tube 7 expands, and after the expansion of the lower expansion tube 7 is completed, under the action of the hydraulic pressure of the working fluid, the expansion cone 2 2 Continue to go up to the middle expansion pipe 5 to complete the expansion of the expansion cone 2 to the middle expansion pipe 5; after the middle expansion pipe 5 is completed, under the action of the hydraulic pressure of the working fluid, the expansion cone 2 continues to go up to the upper expansion pipe 3 to complete the expansion The expansion of the cone 2 to the upper expansion tube 3; the action of expanding the upper expansion tube 3, the action of the expanding expansion tube 5, and the expansion of the lower expansion tube 7 are the same, and the expansion cone 2 is pushed upward by hydraulic pressure. The conical surface of the upper expansion pipe 3, the middle expansion pipe 5 and the lower expansion pipe 7 expand the pipe body. At the same time, if the hydraulic pressure is relatively large during the expansion process, considering the safety factor, the wellhead can cooperate with the increase of the upper lift. force to complete the expansion; after completing the expansion of the upper expansion pipe 3, lift the center pipe 1 out of the wellhead;

Step f, cleaning the bottom plug 8 to complete the repair.

The utility model has a simple structure of the long-section casing damage well expansion tube multi-clamp casing layered isolation repair device. It can be known from the utility model long segment casing damage well expansion tube multi-clamp casing layer isolation repair method. The process is simple, and the upper expansion tube 3, the middle expansion tube 5 and the lower expansion tube 7 use one expansion cone 2 to complete the expansion.

The above descriptions are only illustrative specific implementations of the present utility model, and are not intended to limit the scope of the present utility model. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principle of the present utility model shall fall within the protection scope of the present utility model. And it should be noted that each component of the utility model is not limited to the above-mentioned overall application, and each technical feature described in the specification of the utility model can be selected to be used alone or in combination according to actual needs. Therefore, The utility model naturally covers other combinations and specific applications related to the innovation of this case.

Claims (10)

1. one kind long section many cutting ferrules of casing damaged well expansion tube pipe layering packing prosthetic device, it is characterized in that, described device comprises expansion tube group and can stretch into slidably the central tube of described expansion tube group, described central tube has axial perforation chamber, described expansion tube group is alternately formed by connecting by least three expansion tubes and sleeve pipe, described in adjacent two, between expansion tube, be connected with a sleeve pipe, and described expansion tube group two ends are expansion tube, it is stifled that described expansion tube group bottom is provided with the end, described central tube bottom is connected with the swollen cone with axial passage, the perforation chamber of described central tube and the axial passage of described swollen cone form the infusion channel of up/down perforation, described swollen cone can be placed in the described end and block end.

2. long many cutting ferrules of section casing damaged well expansion tube pipe layering packing prosthetic device according to claim 1, is characterized in that, described sleeve pipe is integral joint casing.

3. long many cutting ferrules of section casing damaged well expansion tube pipe layering packing prosthetic device according to claim 2, it is characterized in that, described expansion tube group is alternately formed by connecting by 3 described expansion tubes and 2 described integral joint casings, 3 described expansion tubes are respectively expansion tube, middle expansion tube, lower expansion tube, 2 described integral joint casings are respectively integral joint casing and lower integral joint casing, described upper integral joint casing connects described upper expansion tube and described middle expansion tube, and described lower integral joint casing connects described middle expansion tube and described lower expansion tube.

4. long many cutting ferrules of section casing damaged well expansion tube pipe layering packing prosthetic device according to claim 3, is characterized in that, the described end is stifled to be placed in the stifled lower end in the lower end of described lower expansion tube and the lower end of described lower expansion tube and the described end and to be threaded.

5. long many cutting ferrules of section casing damaged well expansion tube pipe layering packing prosthetic device according to claim 2, is characterized in that, between described expansion tube and described integral joint casing, all connects by variable buckle joint.

6. long many cutting ferrules of section casing damaged well expansion tube pipe layering packing prosthetic device according to claim 5, is characterized in that, between described variable buckle joint and described expansion tube, described integral joint casing, is threaded.

7. long many cutting ferrules of section casing damaged well expansion tube pipe layering packing prosthetic device according to claim 1, is characterized in that, the bottom of described central tube is connected with described swollen cone by a jump ring.

8. long many cutting ferrules of section casing damaged well expansion tube pipe layering packing prosthetic device according to claim 1, is characterized in that, the inside wall of described swollen cone offers interior seal groove, in described interior seal groove, is provided with inner seal ring.

9. long many cutting ferrules of section casing damaged well expansion tube pipe layering packing prosthetic device according to claim 1, is characterized in that, the lateral wall of described swollen cone offers external seal groove, in described external seal groove, is provided with exterior seal ring.

10. long many cutting ferrules of section casing damaged well expansion tube pipe layering packing prosthetic device according to claim 1, is characterized in that, the stifled lateral wall in the described end offers the stifled seal groove in the end, is provided with the stifled sealing ring in the end in the stifled seal groove in the described end.

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