CN-121993085-A - Horizontal well repairing and reinforcing device for lower small sleeve

Abstract

The invention relates to the technical field of workover of hanging small sleeves of oil and gas wells, in particular to a horizontal well repairing and reinforcing device for a lower small sleeve. The device for repairing and reinforcing the horizontal well by using the lower small casing comprises the small casing, wherein a packing device is arranged on the small casing, the packing device comprises a packer, one end of the packer is connected with a differential pressure sliding sleeve, a first centralizer is arranged between the packer and the differential pressure sliding sleeve, the other end of the packer is connected with a sealing device for sealing one port of the small casing, and a second centralizer is arranged between the packer and the sealing device. The small sleeve repairing and reinforcing horizontal well device provided by the invention has the advantages that the small sleeve is lowered to the position above the oil layer, the oil layer is blocked by using the packer blocking technology, the well cementation cement can flow back and solidify above the packer, and a firm cement ring is formed, so that the oil and gas layer is effectively isolated and protected, and the pollution of the well cementation cement slurry is avoided.

Inventors

• ZHAO JIE
• WANG YUJUN
• HUI XIAOMIN
• FAN ZHIYI
• SUN FEI
• Mu shuai

Assignees

• 中国石油化工股份有限公司
• 中国石油化工股份有限公司中原油田分公司

Dates

Publication Date

20260508

Application Date

20241101

Claims (10)

1. 1. The utility model provides a consolidate horizontal well device is restoreed to little sleeve pipe down, its characterized in that, includes little sleeve pipe, little sleeve pipe is connected with pressure differential sliding sleeve through drillable float collar, and pressure differential sliding sleeve lower extreme is connected with packing device, packing device includes the packer, the packer with be equipped with first centralizer between the pressure differential sliding sleeve, the other end of packer is connected with sealing device and is used for sealing little sleeve pipe port, the packer with be equipped with the second centralizer between the sealing device.
2. 2. The lower casing repair reinforced horizontal well device of claim 1, wherein the first centralizer comprises a connecting cylinder and a centralizer body, both of which are tubular structures, and the centralizer body is sleeved on the lower part of the connecting cylinder and is in clearance fit with the outer surface of the connecting cylinder.
3. 3. The lower small casing repairing and reinforcing horizontal well device according to claim 2, wherein the outer cylindrical surface of the connecting cylinder is a step surface, the upper end of the connecting cylinder is provided with internal threads for matching with external threads arranged at the lower end of the central cylinder, and the lower end of the connecting cylinder is provided with external threads for connecting with a packer.
4. 4. A casing repair reinforced horizontal well device according to claim 2 or 3, wherein the centralizer is cylindrical and has a diameter slightly larger than the outer diameter of the other device components of the packer device, and the outer surface of the centralizer is evenly provided with a set of inclined grooves at an angle to its centre line.
5. 5. The lower small casing repairing and reinforcing horizontal well device according to claim 1, wherein the packer comprises a rubber cylinder seat, the packer is connected with an external thread arranged at the lower end of the connecting cylinder in a matched manner through an internal thread arranged at the upper end of the rubber cylinder seat, a rubber cylinder is arranged on the rubber cylinder seat, a setting mechanism is connected to the rubber cylinder, and a locking mechanism is connected to the setting mechanism.
6. 6. The lower casing repair reinforced horizontal well device of claim 5, wherein the second centralizer comprises an upper sub, a lower sub, and a centralizer disposed between the upper sub and the lower sub, the centralizer being disposed over a lower portion of the upper sub and in clearance fit with an outer surface of the lower sub.
7. 7. The lower small casing repairing and reinforcing horizontal well device according to claim 6, wherein the upper joint is of a tubular structure, the outer surface of the upper joint is of a step surface, the upper end of the upper joint is large and small in the upper part, an inner thread is arranged at the upper end of the upper joint and used for being matched and connected with the locking mechanism, an outer thread is arranged at the lower end of the upper joint and used for being matched and connected with an outer thread arranged at the upper end of the lower joint, the outer surface of the lower joint is of a step surface, the upper end of the lower joint is large and small in the upper part, and an outer thread is arranged at the lower end of the lower joint and used for being matched and connected with the sealing device.
8. 8. The lower casing repair reinforced horizontal well device of claim 7, wherein the centralizer is cylindrical and has a diameter slightly larger than the outer diameter of other device components of the packer device, and wherein the outer surface of the centralizer is uniformly provided with a set of angled slots angled from its centerline.
9. 9. The lower casing repair reinforced horizontal well device of claim 8, wherein the sealing device is a drillable ball seat that is identical to a drillable float collar structure.
10. 10. The lower casing remediation and strengthening horizontal well apparatus of claim 1 wherein the pressure differential sliding sleeve is threadably connected to the drillable float collar.

Description

Horizontal well repairing and reinforcing device for lower small sleeve Technical Field The invention relates to the technical field of workover of hanging small sleeves of oil and gas wells, in particular to a horizontal well repairing and reinforcing device for a lower small sleeve. Background Horizontal wells refer to wells in which the wellbore trajectory reaches or approaches horizontal conditions in the subsurface and maintains a length of horizontal well section. The horizontal well is mainly used for the development of unconventional oil and gas reservoirs such as thin-layer oil reservoirs, low-permeability oil reservoirs, fractured oil and gas reservoirs and the like, and has the advantages of improving the recovery ratio, increasing the oil and gas yield, reducing the drilling quantity and the like. The well track of the horizontal well keeps a certain length of horizontal section in the oil layer, so that the contact area of the well and the oil layer is greatly increased, and the recovery ratio of a single well is improved. In the development and production process of an oil field, the casing is possibly subjected to additional stress due to geological factors such as abnormal formation pressure, fault activity, lithology interface sliding and the like, so that deformation, fracture or leakage occurs, water is discharged from a horizontal well, and the oil extraction efficiency and the oil discharge quality are affected. Thus, for well sections where casing damage has occurred, a cementing repair operation is required. In the prior art, a hanging small casing is often used for repairing a casing damage well. The basic principle of the casing-damaged well hanging small casing technology is that a new casing with smaller diameter is put into a casing-damaged well section, the annulus between the new casing and the original casing is sealed through cementing operation, so that a new and firm shaft channel is formed, cementing slurry is injected into the shaft channel, and after the cementing slurry is solidified, a stable cement column is formed for subsequent production. Chinese patent application publication No. CN205370504U, publication No. 2016/07/06 discloses a plugging process pipe column suitable for horizontal well cementing of small casing. The plugging process tubular column suitable for horizontal well cementing of the small casing comprises a construction drill rod, wherein the small casing is connected below the construction drill rod, a ball seat is connected below the small casing, the lower end of the ball seat is connected with a floating shoe through a floating hoop, and the floating shoe, the floating hoop, the small casing and the ball seat are all arranged inside a precise microporous sand prevention pipe. The upper ends of the precise microporous sand control pipes which are sequentially connected from top to bottom are connected to the bottom end of the large sleeve. The outer wall of the upper end of the small sleeve is connected with a hanger, and the hanger is hung on the inner wall of the bottom end of the large sleeve. The construction drill rod penetrates through the large sleeve. And filling injection plugging cement into an annulus between the inner cavity of the precise microporous sand control pipe and the small sleeve, and filling injection plugging cement into an annulus between the outer part of the precise microporous sand control pipe and the open hole well wall. The Chinese patent application with the authorized bulletin number of CN203499632U and the authorized bulletin day of 2014/03/26 discloses a sleeve damage horizontal well hanging small sleeve repairing process pipe column, which comprises a drill pipe small rubber plug, a feeding drill pipe, a front-back buckle hanging back buckle joint, a hollow rubber plug assembly, a small sleeve string, a spiral rigid centralizer, a bump-press joint, a floating shoe, a floating hoop and a cyclone pipe, wherein the spiral rigid centralizer is connected between the small sleeves in a threaded manner. And during well cementation, the pipe column is lowered to a well section below an oil layer, and cement slurry is injected. The Chinese invention application with application publication number CN113294135A and application publication number 2021/08/24 discloses a method for remolding a sleeve shaft in a horizontal well sleeve. The method comprises the following steps of setting a small sleeve or an oil pipe and a hanger in a shaft, plugging original pore channels and cracks of the shaft by using a polymer plugging agent, cementing the small sleeve or the oil pipe by using cementing slurry, waiting for solidification, and testing the pressure of the small sleeve or the oil pipe according to the later fracturing requirement. The three patents are all well cementation at the well section of the oil layer, so that not only is the oil layer polluted, but also the oil layer is required to be communicated again, the well ceme