CN214616480U

CN214616480U - Oil field water injection well water injection layering multitube divides water injection system

Info

Publication number: CN214616480U
Application number: CN202120644397.3U
Authority: CN
Inventors: 桂钦民
Original assignee: BEIJING DONGSHENG CENTURY TECHNOLOGY CO LTD
Current assignee: BEIJING DONGSHENG CENTURY TECHNOLOGY CO LTD
Priority date: 2021-03-30
Filing date: 2021-03-30
Publication date: 2021-11-05
Anticipated expiration: 2031-03-30

Abstract

The utility model relates to an oil field water injection well water injection layering multitube divides the water injection technical field, especially relates to an oil field water injection well water injection layering multitube divides water injection system. The system comprises an oil pipe, a sleeve, a central pipe, a plurality of packers, an underground multi-channel separate injection tool, a fixed pressure sleeve, a water injection well mouth and a ground separate injection system. The layered flow path is formed by annularly injecting an upper layer of a sleeve and an oil pipe, annularly injecting a middle layer of a central pipe, annularly injecting a lower layer of the oil pipe and the central pipe and separating the injected layers of the underground well by a packer. The water injection separate-layer injection allocation system of the oil field water injection well realizes the ground completion of the separate-layer water regulation amount, and saves the separate-layer testing time and cost; secondly, the problem that part of wells (large-slope horizontal wells) cannot be injected in a layered mode is solved; thirdly, the bottom pressure of the stratified injection well does not need to be tested; and fourthly, whether the layered downhole tool fails or not can be directly judged through the injection pressure of the three flow passages.

Description

Oil field water injection well water injection layering multitube divides water injection system

Technical Field

The utility model relates to an oil field water injection well water injection layering multitube divides annotates technical field, especially relates to an oil field water injection well water injection layering injection allocation system.

Background

At present, many oil fields at home and abroad are developed by water injection and enter a high-water-content later-stage subdivision exploitation stage in sequence, and the difficulty of stable exploitation is gradually increased. The conventional main measure is the water injection of the sub-layer, and the energy of the sub-layer is kept not excessive.

At present, the water injection and separate injection of an oil field water well mainly adopts an eccentric and hollow separate injection process, the two separate injection processes and a matched measurement and debugging process have respective advantages, but two common problems exist, namely the difficult allocation, especially for a low-permeability oil field, a large inclination and a horizontal well. The reason is that the fishing tool and the water distributor are difficult to butt joint due to scaling, oil return and flow and well deviation of the water injection well. Aiming at the problems, novel injection allocation and test systems are continuously developed in many domestic oil fields.

Disclosure of Invention

The utility model aims at providing an oil field water injection well water injection layering multitube divides system of annotating utilizes sleeve pipe, oil pipe, center tube and supporting well instrument, packer in the pit, realizes that sleeve pipe and oil pipe, oil pipe and center tube respectively annotate the one deck, and the water yield adjustment is accomplished on ground, has solved well layering test difficulty and some well and can not divide the branch and annotate the problem.

The utility model provides an oil field water injection well water injection layering multitube divides the injection system, including oil pipe, sleeve pipe, center tube, a plurality of packers, center tube insert head, tee bend and level pressure blast valve; the lower part of the central pipe is connected with a central pipe inserting head through screw threads, the central pipe is inserted into the tee joint from the inside of the oil pipe, and the central pipe inserting head is inserted into an inserting hole of the middle tee joint to form inserting seal; the upper end of the central pipe is connected with a central pipe flowmeter through a central pipe control valve; an annular flow passage between the oil pipe and the central pipe is connected with an annular flow passage flowmeter of the oil pipe and the central pipe through an annular flow passage control valve of the oil pipe and the central pipe; an annular flow passage between the casing and the oil pipe is connected with an annular flow passage flowmeter through the oil pipe and a casing annular flow passage control valve, and a plurality of packers are arranged in the casing; the constant pressure blasting valve is arranged at the bottom of the oil pipe.

The utility model provides an oil field water injection well water injection layering multitube divides water injection system, its advantage is:

the utility model discloses a water injection layering multitube separate injection system of oil field water injection well, firstly realized that the layering regulating pondage ground is accomplished, saved layering test time and expense; secondly, the problem that part of wells (large-slope horizontal wells) cannot be injected in a layered mode is solved; thirdly, the bottom pressure of the stratified injection well does not need to be tested; and fourthly, whether the layered downhole tool fails or not can be directly reflected by the ground injection pressure.

Drawings

Fig. 1 is the structure schematic diagram of the layered multi-pipe separate injection system for water injection of the oil field water injection well.

Fig. 2 is a schematic diagram showing the structure of a tee in the dispensing system shown in fig. 1.

Fig. 3 is a sectional view a-a of fig. 2.

In fig. 1-3, 1 is a central tube flowmeter, 2 is an oil tube and central tube annulus flow channel flowmeter, 3 is an oil tube and casing annulus flow channel flowmeter, 4 is a central tube control valve, 5 is an oil tube and central tube annulus flow channel control valve, 6 is an oil tube and casing annulus flow channel control valve, 7 is a water injection well head, 8 is a central tube, 9 is an oil tube, 10 is a casing, 11 is a water well injection layer, 12 is a packer, 13 is a central tube insert head, 13.1 is a seal ring, 14 is a tee, 14.1 is a tee-joint water flow lower layer flow channel, 14.2 is a central tube insert head insert hole, 14.3 is a tee-joint water flow middle layer flow channel, and 15 is a constant pressure blasting valve.

Detailed Description

The utility model provides an oil field water injection well water injection layering multitube divides water system of annotating, as the structure is shown in figure 1. The device is characterized by comprising an oil pipe 9, a casing 10, a central pipe 8, a plurality of packers 12, a central pipe inserting head 13, a tee joint 14 and a constant pressure blasting valve 15; the lower part of the central pipe 8 is connected with a central pipe inserting head 13 through screw threads, the central pipe 8 is descended into a tee 14 from the oil string 9, the central pipe inserting head 13 is inserted into an inserting hole 14.2 of the tee 14 to form inserting seal, and the structure of the tee 14 is shown in figures 2 and 3. The upper end of the central pipe 9 is connected with a central pipe flowmeter through a central pipe control valve 4; an annular flow channel between the oil pipe 9 and the central pipe 8 is connected with the oil pipe and central pipe annular flow channel flowmeter 2 through the oil pipe and central pipe annular flow channel control valve 5; an annular flow channel between the casing 10 and the oil pipe 9 is connected with an annular flow channel flowmeter 3 through an oil pipe and casing annular flow channel control valve 6, and a plurality of packers 12 are arranged in the casing 10; the constant pressure blasting valve 15 is arranged at the bottom of the oil pipe 9.

The following combination of the attached drawings introduces the utility model provides an oil field water injection well water injection layering multitube is divided and is annotated water system working process:

the construction steps are as follows: the oil pipe 9 is respectively connected with a constant pressure blasting valve 15, a plurality of packers 12 and a tee joint 14, and the oil pipe 9 is lowered to a designed and appointed position. The lower part of the central tube 8 is connected with a central tube inserting head 13 through screw threads, a sealing ring 13.1 is arranged in the central tube inserting head 13, the sealing ring 13.1 is used for sealing a movable sealing gap between the central tube inserting head 13 and a central tube inserting head inserting hole 14.2, the central tube 8 is inserted into a tee joint 14 from the inside of the oil tube 9, and the central tube inserting head 13 is inserted into the central tube inserting head inserting hole 14.2 to form insertion sealing. Well heads 7 of the water injection wells are well seated; high-pressure water is connected from an annular flow passage valve 5 between an oil pipe 9 and a central pipe 8 for pressurizing, so that a plurality of packer pipes 12 are sealed in an expanding way, and the purpose of interlayer packing between an upper water well injection layer 11, a middle water well injection layer and a lower water well injection layer 11 is achieved. And increasing the pressure to open the constant pressure blasting valve 15, and injecting the constant pressure blasting valve into the lowest layer flow passage as an annular space between the oil pipe 9 and the central pipe 8.

Firstly, according to the engineering design requirements, according to the construction steps, a downhole tubular column is put into the downhole tubular column, then a high-pressure pipeline for an oil field high-pressure water source is respectively connected into a central tube flow passage valve 4, a central tube control valve 5 of an annular flow passage between an oil tube 9 and a central tube 8 and an annular flow passage control valve 6 between the oil tube column 9 and a sleeve 10, and layered multi-tube separate injection water injection can be realized. The multi-pipe separate injection water flow channel is respectively a sleeve 10 and an upper layer (an upper water well injection layer 11) of annular injection of an oil pipe column 9; the central pipe 9 injects the middle layer, namely the middle well injection layer 11, through a three-way water flow middle layer flow channel 14.3 of a three-way 14; the tubing string 9 and the central tube 8 are injected into the lower water well injection layer 11 through a tee joint water flow lower flow passage 14.1 of a tee joint 14.

The flow meter 1 for layered water injection displays the central pipe 8, the flow meter 2 displays the annular space between the oil pipe column 9 and the central pipe 8, the flow meter 3 displays the flow of the annular flow channel between the oil pipe column 9 and the sleeve 10, and the flow valves 4, 5 and 6 can respectively control the flow of 3 flow channels, so that the precise layered water injection on the ground can be realized.

Claims

1. A water injection layering multi-pipe separate injection system for an oil field water injection well is characterized by comprising an oil pipe, a sleeve, a central pipe, a plurality of packers, a central pipe inserting head, a tee joint and a constant pressure blasting valve; the lower part of the central pipe is connected with a central pipe inserting head through screw threads, the central pipe is inserted into the tee joint from the inside of the oil pipe, and the central pipe inserting head is inserted into an inserting hole of the middle tee joint to form inserting seal; the upper end of the central pipe is connected with a central pipe flowmeter through a central pipe control valve; an annular flow passage between the oil pipe and the central pipe is connected with an annular flow passage flowmeter of the oil pipe and the central pipe through an annular flow passage control valve of the oil pipe and the central pipe; an annular flow passage between the casing and the oil pipe is connected with an annular flow passage flowmeter through the oil pipe and a casing annular flow passage control valve, and a plurality of packers are arranged in the casing; the constant pressure blasting valve is arranged at the bottom of the oil pipe.