CN217055052U - Thermal production well tail pipe prestress well completion pipe string - Google Patents

Abstract

The invention relates to the technical field of petroleum well cementation and completion, in particular to a thermal production well tail pipe prestress well completion pipe column which comprises a well completion tool such as an expansion hanger, a tail pipe, a thermal compensator, an earth anchor, a floating hoop and the like, wherein the expansion hanger is positioned at the top of the tail pipe column, the earth anchor is positioned at the bottom of the tail pipe, the thermal compensator is positioned in the middle of the tail pipe, and a sealing assembly of the expansion hanger is a metal and rubber dual-material composite seal. The anchor fluke of the ground anchor can be opened in a hydraulic state, and provides tensile stress for the tail pipe string together with the expansion hanger, so that the prestressed well completion operation of the tail pipe is realized, the lifting stress is applied to the tail pipe string in advance, and the difficult problems that the string is heated, stretched and damaged when the high-temperature handling in the later period is facilitated to be relieved.

Description

Thermal production well tail pipe prestress well completion pipe string

Technical Field

The utility model relates to a well completion field is consolidated to the oil, in particular to thermal production well tail pipe prestressing force well completion tubular column.

Background

The tail pipe well completion process is the most common well completion method in deep well, side well and deepened well cementing, can save casing, reduce annular flow resistance and displacement pressure during cementing, and solve the difficult problem of well cementing and completion of deep wells and complex wells. The thermal production well needs multiple rounds of steam injection production in the later stage, the steam huff and puff seriously damages the casing, and the casing string needs to be given pulling stress in advance during well completion so as to offset the tubular column extension extremely caused by the thermal stress of the casing due to thermal expansion and prevent the casing from being damaged due to thermal expansion. However, because the liner hanger adopts a well completion mode of firstly sitting and hanging and then cementing, when the liner of a conventional thermal production well is completed, prestress cementing operation cannot be realized under the influence of a tool structure and a process. In particular, thermal recovery sidetracking drilling is restricted by the factors of small borehole size after sidetracking, non-matching of well completion tools, serious damage of steam injection development to a sleeve and a cement sheath and the like to perform tail pipe prestress well completion operation of thermal recovery sidetracking drilling.

In order to solve the difficulty of well completion of the tail pipe of the thermal production well, well completion tools such as a high-temperature-resistant expansion hanger, a prestressed ground anchor and the like need to be designed and researched, and a prestressed well completion pipe column of the tail pipe of the thermal production well is formed in a matched mode.

Disclosure of Invention

The utility model aims at providing a to the technical problem that current tail pipe well completion can't realize the operation of thermal production well prestressing force, provide a thermal production well tail pipe prestressing force well completion tubular column, well completion instruments such as supporting high temperature resistant inflation hanger and prestressing force earth anchor satisfy thermal production well tail pipe well cementation construction requirements, the thermal production well tail pipe prestressing force well completion operation under the special operating mode conditions such as specially adapted deep well, sidetracking well, the potential safety hazard in the aspect of casing damage when reducing steam injection thermal recovery.

The utility model provides a technical scheme of technical problem:

to the difficult technical problem, the utility model aims at providing a thermal recovery well tail pipe prestressing force well completion tubular column realizes thermal recovery well tail pipe prestressing force well completion operation to alleviate thermal recovery sidetracking well because of many rounds of high temperature steam huff and puff exploitation normal tail pipe thermal elongation damage scheduling problem.

The invention provides a prestressed well completion string for a tail pipe of a thermal production well, which comprises tools such as an expansion hanger, the tail pipe, a thermal compensator, an earth anchor, a floating collar, a guide shoe and the like. The expansion hanger is a well completion tool for hanging a tail pipe, which is designed by utilizing the principle of an expansion pipe, the body is made of expandable casing materials, and the expansion hanger is hung under the hydraulic action of an expansion cone and an inner pipe tool. The sealing assembly of the expansion hanger is a metal and rubber double-material composite seal, the sealing assembly is vulcanized on the outer surface of the expansion hanging cylinder, can be freely selected from one or more of the combination of a rubber cylinder, a trapezoidal metal tooth and a threaded metal ring, and can also be processed into a metal bulge structure on the outer side of the expansion hanging cylinder of the sealing assembly section to increase the sealing effect.

In one embodiment, the ground anchor comprises a body, a sliding block, a connecting rod, an anchor claw and the like, wherein the anchor claw is fixed on the body and is connected with the sliding block through the connecting rod, and the sliding block is fixed and limited through a locking pin. A ball seat is processed at the top of a sliding block of the ground anchor, after a sleeve rubber plug is pressed to the ball seat, a positioning pin is used for shearing, the ground anchor is driven to be opened by hydraulic pressure, and a fluke connected with the sliding block is pushed to be opened through a connecting rod when the sliding block moves downwards, so that the outer diameter of the fluke is increased.

In one embodiment, the thermal compensator is a well completion tool with a heated pipe column capable of moving in a certain stroke to compensate the heated elongation of the pipe column, and can be in a pin type, a hot melting type, a locking block type and other structures, and the number and the position of the tools can be adjusted according to the length and the type of the pipe column.

In one embodiment, the expansion cone of the expansion hanger is mounted on an inner pipe tool, and the plastic deformation of the expansion hanger can be realized by hydraulic pressure, and the downstream section of the inner pipe tool is provided with a casing rubber plug.

In one embodiment, the lower end of the tail pipe is sequentially provided with a ground anchor, a floating hoop and a guide shoe, and the tail pipe can be arranged at intervals as required.

The utility model has the main advantages that:

(1) the prestressed well completion operation of the tail pipe is realized through tools such as an expansion hanger, a ground anchor and the like, the lifting stress is applied to the tail pipe column in advance, and the difficult problems that the pipe column is heated, elongated and damaged in the later period of high-temperature handling are relieved;

(2) the operation mode of firstly opening the ground anchor and then hanging the expansion hanger is adopted, so that the tail pipe column can be ensured to be lifted and the prestress is kept.

(3) The expansion hanger is sealed by adopting rubber and metal double materials, the sealing material has strong temperature resistance, and the temperature resistance and the long-acting performance of the seal of the thermal recovery well tail pipe head are achieved.

Drawings

FIG. 1 is a diagram of a thermal production well liner pre-stressed completion string of the present invention;

FIG. 2 is a schematic view of the prestressed completion string of the present invention being run in;

FIG. 3 is a schematic diagram of the pre-stressed completion operation of the present invention;

FIG. 4 is a schematic view of a seal assembly of the expansion hanger;

fig. 5 is a schematic diagram of the structure of the ground anchor.

Wherein: 1. the expansion hanger comprises an expansion hanger body, 101, a hanging barrel, 102, a sealing assembly, 103, an inner pipe tool, 104, an expansion cone, 105, a casing rubber plug, 106, a buckle joint, 2, a thermal compensator, 3, a tail pipe, 4, a ground anchor, 401, a positioning pin, 402, a sliding block, 403, a connecting rod, 404, an anchor claw, 405, a body, 406, a ball seat, 5, a floating hoop, 6, a guide shoe, 7, a drill stem, 8, a technical casing, 1021, a rubber barrel, 1022, trapezoidal metal teeth and 1023 a threaded metal ring.

Detailed Description

The invention will be further described with reference to the accompanying drawings. In the following, directional terms "lower," "downstream," "downward," etc. refer to a direction away from the wellhead, while "upper," "upstream," "upward," etc. refer to a direction toward the wellhead.

Fig. 1 shows a thermal production well liner pre-stressed completion string according to an embodiment of the present disclosure. As shown, the pipe string mainly comprises an expansion hanger 1, a thermal compensator 2, a tail pipe 3, a ground anchor 4, a float collar 5, a guide shoe 6 and the like. The lower end of the tail pipe 3 is sequentially provided with a ground anchor 4, a floating hoop 5 and a guide shoe 6, and the tail pipes 3 can be arranged at intervals as required.

The expansion hanger 1 includes: expansion hanging cylinder 101, sealing assembly 102, inner tube tool 103, expansion cone 104, casing plug 105, and adapter 106.

The expansion suspension cylinder 101 of the expansion suspension device 1 according to the present invention is an expandable casing material, and the outer surface thereof is provided with a seal assembly 102. As shown in fig. 4, the sealing assembly 102 is made of metal and rubber, and can form a two-material composite seal, and the structure of the sealing assembly can be freely selected from one or more of the combination of a rubber cylinder 1021, trapezoidal metal teeth 1022 and a threaded metal ring 1023, and a metal protrusion structure can also be processed on the outer side of the expansion suspension cylinder 101 of the sealing assembly 102 to increase the sealing effect.

The expansion cone 104 of the expansion hanger 1 is installed on the inner pipe tool 103, and can realize the plastic deformation of the expansion hanging cylinder 101 through hydraulic pressure force, the casing rubber plug 105 is installed at the downstream section of the inner pipe tool 103.

The lower end of the expansion hanging cylinder 101 is connected with a buckle adapter 106, and the lower end of the buckle adapter 106 is connected with the tail pipe 2.

As shown in fig. 5, the ground anchor 4 of the present invention includes a body 405, a slider 402, a connecting rod 403, a fluke 404, and the like, wherein the fluke 404 is hinged on the body 405, and is hinged with the slider 402 through the connecting rod 403, and the slider 402 is fixed and limited by a locking pin 401. A ball seat 406 is processed on the top of a sliding block 402 of the ground anchor 4, after the sleeve rubber plug 105 is pressed to the ball seat 406, a positioning pin 401 shears, the ground anchor 4 is driven to be opened by hydraulic force, and a fluke 404 connected with the sliding block 402 is pushed to be opened through a connecting rod 403 when the sliding block 402 goes downwards, so that the outer diameter of the fluke 404 is increased.

Heating power compensator 2 for a be heated the back tubular column can be in the well completion instrument of the extension volume that is heated in order to compensate the tubular column in certain stroke internalization, can be for pin formula, hot melt formula and locking block formula isotructure, according to 3 adjustable heating power compensator 2's of tail pipe length and type quantity and position of locating.

The tail pipe prestressed well completion method by utilizing the thermal production well tail pipe prestressed well completion pipe column comprises the following steps of:

the method comprises the following steps: the tail pipe 3 is run in. As shown in figure 2, a tail pipe column is set according to the design of a prestressed completion pipe column, a drill pipe 7 is used for carrying, and the recommended pipe column structure comprises a guide shoe 6, a floating hoop 5, a ground anchor 4, a tail pipe 3, a thermal compensator 2, the tail pipe and an expansion hanger 1 from bottom to top, wherein the guide shoe 6, the floating hoop 5 and the ground anchor 4 can be provided with the tail pipe 3 at intervals according to requirements.

Step two: and (4) replacing well cementation, and opening the ground anchor 4 by collision pressure. After the pipe column is lowered to a designed position, cement is injected in a circulating mode, a drill rod rubber plug is thrown into the position to replace the casing pipe rubber plug 105 to be subjected to shearing compounding, the casing pipe rubber plug 105 is continuously replaced to be impacted to the position of the ball seat 406 of the ground anchor 4, the positioning pin 401 of the ground anchor 4 is sheared under the hydraulic action, the sliding block 402 moves downwards, and the connecting rod 403 pushes the anchor fluke 404 to be opened.

Step three: the tailpipe column is prestressed by pulling. After the ground anchor 4 is opened, the pump is stopped, a certain prestress is pulled from the well mouth, the prestress applied by the tail pipe 3 is calculated and adjusted according to the actual well condition, and meanwhile, the mechanical force can be improved for the expansion hanger 1 to be hung.

Step four: the expansion hanger 1 is hung. As shown in fig. 3, after the tail pipe string is subjected to the pulling prestress, the drilling rod 7 is pressurized and lifted up under the pressure stabilizing effect when the pressure reaches the setting pressure of the expansion hanger 1, the expansion cone 104 runs upwards under the hydraulic effect, the expansion hanging cylinder 101 is expanded and set, and the sealing assembly 102 is squeezed between the expansion hanging cylinder 101 and the technical casing 8, so that reliable sealing performance and hanging force are formed.

Step five: and releasing the well completion. And (5) pulling out the inner pipe tool 103 of the expansion hanger 1 to complete the tail pipe prestress well completion operation.

In one embodiment, in step four, the pre-applied tailpipe pre-stress in the completion may be maintained by virtue of the high sealing and suspension force provided by the seal assembly after the expansion hanger is set.

While the present invention has been described with reference to preferred embodiments in the present embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the embodiments can be combined in any manner without structural conflicts. The present invention is not limited to the particular embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims (7)

1. A thermal production well tail pipe prestressed completion pipe string is characterized by comprising:

the expansion hanger, the tail pipe and the ground anchor are sequentially connected from top to bottom;

the thermal compensator is arranged in the tail pipe.

2. The thermal production well tail pipe prestressed completion pipe string as claimed in claim 1, wherein a float collar and a guide shoe are further connected in sequence below the ground anchor.

3. The thermal production well liner prestressed completion string according to claim 1, wherein said expansion hanger comprises: the expansion hanging cylinder, the sealing assembly, the inner pipe tool, the expansion cone, the sleeve rubber plug and the buckle adapter;

the lower end of the expansion hanging cylinder is connected with a buckle changing connector, and the lower end of the buckle changing connector is connected with a tail pipe;

a sealing assembly is arranged on the outer surface of the expansion suspension cylinder;

the middle part of the inner pipe tool is provided with an expansion cone, and the downstream part is provided with a sleeve rubber plug.

4. The thermal production well liner prestressed completion string according to claim 3, wherein the sealing assembly of said expansion hanger is a metal and rubber two-material composite seal.

5. The thermal production well liner prestressed completion string according to claim 4, wherein said sealing assembly is vulcanized on the outer surface of said expandable suspension cylinder, and can be freely formed from one or several kinds selected from the group consisting of rubber cylinder, trapezoidal metal tooth and threaded metal ring.

6. The thermal production well tail pipe prestressed completion string according to claim 1, wherein the ground anchor comprises a body, a sliding block slidably sleeved in the body, a connecting rod hinged to the sliding block, and a fluke hinged to the connecting rod, and when the sliding block moves downwards, the fluke connected with the sliding block is pushed to open through the connecting rod, so that the outer diameter of the fluke is increased.

7. The thermal production well liner prestressed completion string according to claim 6, wherein a ball seat is formed on the top of the sliding block, and after the casing rubber plug is impacted on the ball seat, the positioning pin is sheared, and the ground anchor is opened by hydraulic pressure.

Images