CN-121993063-A - Layered well backwashing mechanism, layered well washing device and layered well washing method for oil well

CN121993063ACN 121993063 ACN121993063 ACN 121993063ACN-121993063-A

Abstract

The invention discloses an oil well layered backwashing well mechanism, a layered well washing device and a layered well washing method, which relate to the technical field of petroleum exploitation equipment and are characterized in that a first oil pipe section, a first backwashing mechanism, a second backwashing mechanism and a packer are arranged, in the separate layer water injection operation, when the annular space of the sleeve and the oil pipe is blocked due to the entering of gravel, the blocking position can be judged through ground flow monitoring, and then the dissolving liquid is injected to sequentially dissolve the first backwashing mechanism and the second backwashing mechanism. The well flushing liquid firstly enters the pipe through the open first liquid inlet and then is split into the nozzles to form jet flow, the jet flow enters the packer backwash small channel and is sprayed to the annulus below, powerful flushing is carried out on scale and sand plugs, the problem that the backwash function is completely invalid due to the plugging of the lower part of a conventional packer is avoided, meanwhile, the pipe column is prevented from being blocked, the risk of overhaul and even scrapping of an oil well is reduced, and the targeted effective cleaning of each layered annulus is realized.

Inventors

WANG HAIFENG
XU FAN
YANG MINGHUI
LIU LIANGLIANG
GUO YULONG
LI GUOAN
Nurzati Ilzati
ZHANG SHENG
ZHOU YONGKANG
XUE YANG

Assignees

克拉玛依市红都有限责任公司

Dates

Publication Date: 20260508
Application Date: 20260410

Claims (10)

1. An oil well layered backwash well mechanism comprising: The two ends of the first oil pipe section are respectively provided with a threaded joint which can be in threaded fit with an external pipeline, an installation space is formed between the two threaded joints, and a first liquid inlet penetrating through the first oil pipe section in the radial direction is formed in the installation space; the first backwashing mechanism is arranged in the installation space and surrounds the periphery of the first oil pipe section, the first backwashing mechanism is sealed and plugged in the first liquid inlet, and the first backwashing mechanism can be switched from a first plugging state for plugging the first liquid inlet to a first backwashing state for opening the first liquid inlet; The second backwashing mechanism is arranged at one end of the first backwashing mechanism, the second backwashing mechanism is connected with the first backwashing mechanism, the second backwashing mechanism is arranged around the periphery of the first oil pipe section, one end of the second backwashing mechanism, which is far away from the first backwashing mechanism, is provided with a plurality of spouts, all the spouts are arranged around the periphery of the threaded joint on the corresponding side along the periphery, the second backwashing mechanism can be switched from a second blocking state for blocking the spouts to a second backwashing state for opening the spouts, and The packer is in threaded fit with one of the threaded connectors, the packer and the second backwashing mechanism are distributed at intervals, a backwashing small channel which penetrates through the packer is formed in the packer, and a nozzle faces the packer and can jet well flushing liquid towards the other end of the packer through the backwashing small channel.
2. The oil well layered backwash well mechanism as defined in claim 1, wherein said first backwash mechanism comprises: A bearing part arranged in the installation space and surrounding the periphery of the first oil pipe section, the bearing part being formed with a first installation cavity penetrating radially and communicated with the first liquid inlet, and The first sacrificial component is filled in the first mounting cavity, the first sacrificial component is plugged in the first liquid inlet, and the first sacrificial component can be switched from the first plugging state of plugging the first liquid inlet to the first backwashing state of opening the first liquid inlet.
3. The oil well layered backwash mechanism as defined in claim 2, wherein the first sacrificial member comprises: a first sacrificial member filled in the first mounting chamber, and The first protection piece is arranged on the periphery of the first sacrificial piece in a surrounding mode, the first protection piece is filled in the first installation cavity and seals the first liquid inlet in a sealing mode, and the first protection piece and the first sacrificial piece can be subjected to sacrificial dissolution after being contacted with an external dissolving agent so as to open the first liquid inlet.
4. The oil well layered backwash mechanism as defined in claim 3 wherein the first sacrificial member is a first sacrificial core of dissolvable material.
5. The oil well layered backwashing mechanism of claim 3, wherein the first installation cavity extends along the radial direction of the first liquid inlet, the first installation cavity is a piston cavity, the first liquid inlet is provided with a plurality of first liquid inlets, the first liquid inlets are distributed at intervals along the circumferential direction, and the first installation cavity is consistent in number with the first liquid inlets and is arranged in a one-to-one correspondence manner; The first sacrificial member comprises: The piston seats are consistent with the first mounting chambers in number and are arranged in a one-to-one correspondence manner, the piston seats can slide in the corresponding first mounting chambers towards the first liquid inlets along the radial direction and are abutted to the corresponding first liquid inlets, first mounting holes penetrating through the piston seats along the radial direction are formed in the piston seats, and shearing edges are formed at one ends of the piston seats far away from the first liquid inlets; a plurality of shearing plates, the number of the shearing plates is the same as that of the piston seats, and the shearing plates are arranged on the corresponding shearing edges one by one to seal the first mounting holes, and The shearing ball can enter at least one piston seat and shear the corresponding shearing plate in cooperation with the corresponding shearing edge under the pressure action of external well flushing liquid so as to open the first liquid inlet and switch to the first backwashing state, and the shearing ball is made of a sacrificial dissolving material and can be dissolved in external dissolving agent after the shearing plate is sheared.
6. The oil well layered backwash mechanism as defined in claim 5, wherein the carrier comprises: The ball cage support is arranged around the periphery of the first oil pipe section in a surrounding mode, is in interference fit with the outer wall of the first oil pipe section, and forms the first installation cavity in the ball cage support, and The sealing and separating piece is arranged on the periphery of the ball cage support in a surrounding mode, a plurality of holes which are communicated with the first installation cavity are formed in the sealing and separating piece, and all the holes are distributed at intervals along the circumferential direction.
7. The oil well layered backwash mechanism according to any one of claims 1 to 6 wherein the second backwash mechanism comprises: the mounting bracket is connected with the first backwashing mechanism and is arranged around the periphery of the first oil pipe section; The separation plate is arranged on the mounting bracket so as to form a liquid separation space with the first backwashing mechanism, and a plurality of second mounting holes which are distributed at intervals along the circumferential direction are formed in the separation plate; A plurality of nozzles, the number of the nozzles is consistent with that of the second mounting holes and the nozzles are arranged in a one-to-one correspondence manner, each nozzle is provided with a nozzle, a jet injection channel communicated with the liquid separation space is formed in the nozzle, the jet injection channel is arranged in a tapered manner along the direction from the liquid separation space to the corresponding nozzle, and The number of the sacrificial blocks is consistent with that of the jet flow jet channels and the sacrificial blocks are in one-to-one correspondence with each other for sealing and filling, and the sacrificial blocks can be switched from a second blocking state for blocking the jet flow jet channels to a second backwashing state for opening the nozzles.
8. The oil well layered backwashing mechanism of claim 7, wherein a plurality of jet holes are formed in the packer at intervals along the circumferential direction, the jet holes penetrate through the packer, the jet holes are consistent in number and are communicated with the jet channels in a one-to-one correspondence manner, and sacrificial columns are filled in the jet holes in a sealing mode.
9. The oil well layered well washing device is characterized in that the oil well layered well washing device is arranged in a casing pipe in an oil well, and an annulus is formed between the outer wall of the layered well washing device and the casing pipe; The layered well flushing device comprises a plurality of well flushing units, each well flushing unit comprises an oil conveying pipe, a safety release joint, a layered back flushing mechanism, a bridge type concentric water distributor and a single flow valve which are sequentially connected, wherein all the layered back flushing mechanisms can be sealed in the casing through corresponding packers; the well flushing units are sequentially communicated and are all placed in the casing, so that the annular space is sealed and isolated into a plurality of well flushing spaces to be cleaned, well flushing liquid is injected into the annular space, and the well flushing liquid can perform well flushing operation on the well flushing spaces to be cleaned at the two ends of any layered back flushing mechanism.
10. A method for oil well layered well cleanup, characterized in that the oil well layered well cleanup device according to claim 9 is applied; The layered well washing method of the oil well comprises the following steps: When the acquired real-time flow data in the oil delivery pipe are abnormal, judging that the underground annulus of the oil well is blocked; injecting well flushing liquid into the annular space at preset pressure, so that the well flushing liquid sequentially passes through the backwashing small channels in the plurality of packers and enters each well space to be cleaned; When the well-flushing liquid sequentially passes through each backwashing small channel and each well-flushing space, collecting a current data set of each well-flushing space in real time, wherein the current data set comprises a current flow rate and a current pressure difference of the well-flushing liquid in the corresponding well-flushing space; When the current data set does not meet preset conditions, injecting a dissolving solution into the annulus, wherein the dissolving solution is used for sequentially dissolving all the first backwashing mechanisms and all the second backwashing mechanisms above the well to be washed space corresponding to the current data set, so that the corresponding first liquid inlets are in a first backwashing state and all the nozzles are in a second backwashing state; and feeding the well flushing liquid into the annulus in a pulse liquid feeding mode to perform strong backwashing operation until layered backwashing is completed.

Description

Layered well backwashing mechanism, layered well washing device and layered well washing method for oil well Technical Field The invention relates to the technical field of petroleum exploitation equipment, in particular to an oil well layered backwashing mechanism, a layered well flushing device and a layered well flushing method. Background Separate water injection is a core technology for oil field development, different oil layers are separated by using a packer in a shaft, and water is injected into each layer by using a water distributor as required so as to improve oil displacement efficiency and recovery ratio. However, when the separate-layer water injection operation is performed, due to the splitting action of water pressure on the casing, substances such as gravel in the geologic body outside the casing can enter the casing, so that the annulus between the casing and the oil pipe is filled and blocked, and hidden troubles such as pipe clamping and the like of the pipe column in the casing are caused. In the prior art, in order to avoid that the annulus between the casing and the oil pipe is filled and blocked, well flushing operation is usually required to be performed by injecting well flushing liquid through an oil well or the annulus. Although the function of layering well flushing can be realized to common packer among the prior art, in actual operation in-process, because the well condition is complicated, can lead to the packer to appear blocking the phenomenon, leads to the oil well to have the major repair even the risk of scrapping the borehole to, common packer can lead to backwash well function inefficacy when well bottom incrustation scale piles up or blocks up, can not effectively wash upper portion oil pipe. Disclosure of Invention The invention mainly aims to provide an oil well layered back flushing mechanism, a layered flushing device and a layered flushing method, and aims to solve the technical problems that a common packer in the prior art can realize the layered flushing function, but in the actual operation process, the packer is blocked due to complex well conditions, the oil well is subjected to major repair and even the well is scrapped, and the common packer can cause the failure of the flushing function when well bottom scale is accumulated or blocked, so that an upper oil pipe cannot be effectively cleaned. In order to achieve the above object, in a first aspect, the present invention provides a layered oil well backwashing mechanism, comprising: The two ends of the first oil pipe section are respectively provided with a threaded joint which can be in threaded fit with an external pipeline, an installation space is formed between the two threaded joints, and a first liquid inlet penetrating through the first oil pipe section in the radial direction is formed in the installation space; the first backwashing mechanism is arranged in the installation space and surrounds the periphery of the first oil pipe section, the first backwashing mechanism is sealed and plugged in the first liquid inlet, and the first backwashing mechanism can be switched from a first plugging state for plugging the first liquid inlet to a first backwashing state for opening the first liquid inlet; The second backwashing mechanism is arranged at one end of the first backwashing mechanism, the second backwashing mechanism is connected with the first backwashing mechanism, the second backwashing mechanism is arranged around the periphery of the first oil pipe section, one end of the second backwashing mechanism, which is far away from the first backwashing mechanism, is provided with a plurality of spouts, all the spouts are arranged around the periphery of the threaded joint on the corresponding side along the periphery, the second backwashing mechanism can be switched from a second blocking state for blocking the spouts to a second backwashing state for opening the spouts, and The packer is in threaded fit with one of the threaded connectors, the packer and the second backwashing mechanism are distributed at intervals, a backwashing small channel which penetrates through the packer is formed in the packer, and a nozzle faces the packer and can jet well flushing liquid towards the other end of the packer through the backwashing small channel. According to the technical scheme, the first oil pipe section, the first backwashing mechanism, the second backwashing mechanism and the packer are arranged, when the annular space of the sleeve and the oil pipe is blocked due to the entering of gravel in the separate-layer water injection operation, the blocking position can be judged through ground flow monitoring, and then the dissolving liquid is injected to dissolve the first backwashing mechanism and the second backwashing mechanism in sequence. The well flushing liquid firstly enters the pipe through the open first liquid inlet and then is split into the nozzles to form jet flow, the jet flow enters the