CN108894765A - The major-minor well construction and its method of deep water shallow layer gas hydrate exploitation - Google Patents

The major-minor well construction and its method of deep water shallow layer gas hydrate exploitation Download PDF

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Publication number
CN108894765A
CN108894765A CN201810979981.7A CN201810979981A CN108894765A CN 108894765 A CN108894765 A CN 108894765A CN 201810979981 A CN201810979981 A CN 201810979981A CN 108894765 A CN108894765 A CN 108894765A
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China
Prior art keywords
eye
well
shaft
service shaft
casing
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CN201810979981.7A
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Chinese (zh)
Inventor
叶建良
黄芳飞
秦绪文
邱海峻
陆敬安
寇贝贝
李彬
陈文龙
史浩贤
于彦江
卢秋平
陈靓
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Guangzhou Marine Geological Survey
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Guangzhou Marine Geological Survey
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Priority to CN201810979981.7A priority Critical patent/CN108894765A/en
Publication of CN108894765A publication Critical patent/CN108894765A/en
Pending legal-status Critical Current

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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/30Specific pattern of wells, e.g. optimizing the spacing of wells

Abstract

The invention discloses the major-minor well constructions and its method of a kind of exploitation of deep water shallow layer gas hydrate, the major-minor well construction of deep water shallow layer gas hydrate exploitation therein includes being set to seabed mud line straight well main borehole below, at least one horizontal well service shaft eye and at least one main shaft dock wellbore with service shaft, the straight well main borehole includes that main shaft one drives a well eye and main shaft two drives a well eye, drive a well the drive a well top of eye of lower part and the main shaft two of eye of the main shaft one is connected to, the main shaft one drive a well eye cross section diameter be greater than main shaft two drive a well eye cross section diameter;The horizontal well service shaft eye includes that service shaft one drives a well eye and at least one service shaft two drives a well eye, and drive a well drive a well respectively with the service shaft two one end of eye of lower end of eye of the service shaft one is connected to;One end of the main shaft and service shaft docking wellbore and the service shaft one eye that drives a well are connected to, and the other end and the main shaft two eye that drives a well are connected to;The service shaft two eye that drives a well is located at gas hydrates reservoir.

Description

The major-minor well construction and its method of deep water shallow layer gas hydrate exploitation
Technical field
The present invention relates to exploitation of gas hydrates technical fields more particularly to a kind of deep water shallow layer gas hydrate to open The major-minor well construction and its method adopted.
Background technique
With the progress of oil-gas exploration and development technology, more and more deep water shallow layer gas hydrate resources are found, It is the important alternative energy source of conventional gas and oil since gas hydrates reserves are huge, therefore, safely and efficiently develops deep water shallow-layer The predicament of domestic energy supply at present can be effectively relieved in gas hydrates.
Currently, there are mainly two types of forms, i.e. straight well mode and horizontal well mode for the pilot production of deep water shallow layer gas hydrate.So And when using horizontal well development, due to the big limitation of production casing size, deflecting is easy to appear in directional well drilling process The problems such as difficult, track is difficult to control and later period Frictional Drag of Casing Running is larger;And it is suitable for the testing tube of gas hydrates pilot production Column is the big dog-leg well section tripping in process difficulty of horizontal well is big, risk is more;.Therefore the pilot production of deep water shallow layer gas hydrate mainly according to By straight well mode, this is because:
(1) the shallow reservoir of deep water shallow layer gas hydrate reservoir buried depth is mostly not cementing or weak bonding shale flour sand Or flour sand, the down-hole accidents such as borehole well instability, well slough, leakage are easy to appear in drilling process, therefore just can using straight well mode The risk of problems is reduced to a certain extent.
(2) gas hydrates development plan, first, it is desirable that reservoir situation of change is monitored in production process, to need Tripping in sensor monitors temperature in wellbore, pressure and other parameters;Secondly, preventing the secondary generation of hydrate, pit shaft needs to configure chemistry Medicament injects pipeline;Furthermore hydrate pilot production at present belongs to exploratory technology, also other means can be increased (as heated in pit shaft Deng).
In short, gas hydrates pilot production test string is complicated compared with conventional gas and oil test string, it is thus typically necessary to using Large-sized production casing meets pilot production and exploitation requires.So drilling well wind can be reduced to greatest extent using straight well mode Danger, and big size hole can be completed, meet the requirement of deep water shallow layer gas hydrate development plan.
However, deep water shallow layer gas hydrate resource reservoir is generally relatively thin, if developing only with straight well mode, due to straight Well drainage area is small, and single well productivity is low, therefore economic benefit is low, it is difficult to meet Efficient Development.
Summary of the invention
For overcome the deficiencies in the prior art, the purpose of the present invention is to provide a kind of deep water shallow layer gas hydrates to open The major-minor well construction and its method adopted, can solve that straight well drainage area is small, single well productivity is low, the low problem of economic benefit.
In order to achieve the above object, the technical solution adopted in the present invention is as follows:
A kind of major-minor well construction of deep water shallow layer gas hydrate exploitation, including it is set to seabed mud line straight well below Main borehole, at least one horizontal well service shaft eye and at least one main shaft dock wellbore with service shaft, and the straight well main borehole includes Main shaft one drives a well eye and main shaft two drives a well eye, the main shaft one drives a well the lower part of eye and the main shaft two drives a well, and the top of eye connects It is logical, the main shaft one drive a well eye cross section diameter be greater than main shaft two drive a well eye cross section diameter;The horizontal well is auxiliary Wellbore includes that service shaft one drives a well eye and at least one service shaft two drives a well eye, the service shaft one drive a well eye lower end respectively with it is described auxiliary Well two drive a well eye one end connection;One end of the main shaft and service shaft docking wellbore and the service shaft one eye that drives a well are connected to, another End is connected to the main shaft two eye that drives a well;The service shaft two eye that drives a well is located at gas hydrates reservoir.
It preferably, further include main borehole conduit, main borehole two opens casing, service shaft eye one opens casing, main borehole and service shaft eye Docking casing and service shaft eye two open casing, and the main borehole conduit is set to the main shaft one and drives a well in eye, and with the master Well one drive a well eye side wall formed main borehole conduit bore hole annulus;The main borehole two, which opens casing and is set to the main shaft two, to drive a well In eye, and top passes through the main borehole conduit;What the main borehole conduit and the main borehole two opened casing protrudes into main borehole The part of conduit is fixed;The main borehole two is opened the drive a well side wall of eye of another part of casing and the main shaft two and is fixed;It is described Service shaft eye one, which opens casing and is set to the service shaft one, to drive a well in eye, and the main borehole docks casing with service shaft eye and is set to the master Well docks in wellbore with service shaft, and the service shaft eye two, which opens casing and is set to the service shaft two, to drive a well in eye;The service shaft eye one is opened The lower end of casing is connected to one end that the service shaft eye two opens casing;The main borehole docks one end and the institute of casing with service shaft eye It states service shaft eye one and opens casing connection, the other end is opened casing with the main borehole two and is connected to;The service shaft eye one open casing with it is described The drive a well side wall of eye of service shaft one is fixed.
Preferably, the major-minor well construction of deep water shallow layer gas hydrate exploitation further includes service shaft nut cap cement Plug, the service shaft nut cap cement plug are set to the service shaft eye one and open at the upper opening of casing, open for blocking service shaft eye one The upper opening of casing, to prevent gas hydrates from opening casing discharge from service shaft eye one.
Preferably, the main borehole conduit and the main borehole two open the fixation of the part for protruding into main borehole conduit of casing Mode, the main borehole two open another part of casing and the main shaft two and drive a well the fixed form of side wall of eye and described auxiliary Wellbore one open casing and the service shaft one drive a well eye side wall fixed form be poured by cement, and the upper end of cement with Seabed mud line is concordant.
Preferably, the major-minor well construction of deep water shallow layer gas hydrate exploitation further includes service shaft screen casing, described Service shaft screen casing is set to the service shaft two and drives a well intraocularly, and one end is connect with the free end that the service shaft eye two opens casing.
Preferably, the horizontal well service shaft eye is multiple, and multiple horizontal well service shaft eyes are located at the straight well master The two sides of wellbore;Correspondingly, it is multiple, and the number of quantity and the horizontal well service shaft eye that the main shaft, which docks wellbore with service shaft also, It measures identical.
Preferably, the service shaft two drive a well eye be it is multiple, multiple service shafts two drive a well eye one end respectively with it is described auxiliary Well one drive a well eye lower end connection.
A kind of deep water shallow layer gas hydrate recovery method, includes the following steps:
Step 1: hiding the determining horizontal well in conjunction with straight well main borehole of development plan according to deep water shallow layer gas hydrate The ligancy of service shaft eye;
Step 2: carrying out straight well main borehole drillng operation, drive a well after eye firstly, drilling through main shaft one, tripping in main borehole conduit; Then, it drills through main borehole two to drive a well after eye, tripping in main borehole two opens casing;It is opened finally, opening casing in main borehole two with main shaft two Casting cement between the side wall of wellbore, and cement is returned to seabed mud line, is cemented the well to straight well main borehole;
Step 3: mobile drilling platforms, carries out horizontal well service shaft eye drillng operation, drive a well eye firstly, drilling through service shaft one, under Enter service shaft eye one and open casing, service shaft eye one open casing and service shaft one drive a well eye side wall between casting cement, and cement return to Seabed mud line cements the well to the eye that drives a well of service shaft one;Then, service shaft one drive a well now portion carry out sidetracking, drill through service shaft one and open Wellbore and main shaft two main shaft that eye is connect that drives a well dock wellbore with service shaft, and tripping in main borehole docks casing with service shaft eye, and makes Main borehole is opened casing with main borehole two with one end of service shaft eye docking casing and is connected to, and the other end is opened casing with service shaft eye one and is connected to; It drives a well eye finally, drilling through service shaft two, opens a window in the lower part that service shaft eye one opens casing, carry out side in gas hydrates reservoir It bores, tripping in service shaft eye two opens casing, so that one end that service shaft eye two opens casing is opened casing with service shaft eye one and is connected to;
It preferably, further include following steps after step 3:
Step 4: opening service shaft eye two, casing carries out perforating job or screen casing is mounted on service shaft eye by slot, tripping in screen casing Two open the free end of casing.
It preferably, further include following steps after step 4:
Step 5: squeezing into cement at the upper opening that service shaft eye one opens casing, service shaft nut cap cement plug is formed.
Step 6: arranging the device of exploitation of gas hydrate at the well head of straight well main borehole, and tripping in test string.
Step 7: installing the supporting tool of all exploitation of gas hydrate, production testing operation is carried out.
Compared with prior art, the beneficial effects of the present invention are:
The major-minor well construction and its method of deep water shallow layer gas hydrate exploitation of the present invention combine straight well and open Hair and the advantages of horizontal well development, straight well borehole size is big, can tripping in large scale pump, raising oil-production capacity, horizontal well feeds through to Gas hydrates reservoir range it is wider, can further improve gas hydrates reservoir productivity, improve gas hydrates The recovery ratio of reservoir.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the major-minor well construction of deep water shallow layer gas hydrate of the present invention exploitation.
In figure:1- straight well main borehole;101- main shaft one drives a well eye;102- main shaft two drives a well eye;2- horizontal well service shaft eye; 201- service shaft one drives a well eye;202- service shaft two drives a well eye;3- main shaft docks wellbore with service shaft;4- gas hydrates reservoir;5- Seabed mud line;6- main borehole conduit;7- main borehole two opens casing;8- service shaft eye one opens casing;9- main borehole is docked with service shaft eye Casing;10- service shaft eye two opens casing;11- main borehole conduit bore hole annulus;12- service shaft nut cap cement plug;13- service shaft screen casing.
Specific embodiment
In the following, being described further in conjunction with attached drawing and specific embodiment to the present invention:
As shown in Figure 1, the major-minor well construction of deep water shallow layer gas hydrate exploitation of the present invention includes being set to The straight well main borehole 1 below of seabed mud line 5, at least one horizontal well service shaft eye 2 and at least one main shaft and service shaft butt shaft Eye 3, the straight well main borehole 1 include that main shaft one drives a well eye 101 and main shaft two drives a well eye 102, and the main shaft one drives a well eye 101 The drive a well top of eye 102 of lower part and the main shaft two is connected to, and the drive a well diameter of cross section of eye 101 of the main shaft one is greater than main shaft Two drive a well eye 12 cross section diameter;
The horizontal well service shaft eye 2 includes that service shaft one drives a well eye 201 and at least one service shaft two drives a well eye 202, described auxiliary Drive a well drive a well respectively with the service shaft two one end of eye 202 of lower end of eye 201 of well one is connected to;The main shaft docks wellbore with service shaft 3 one end and the service shaft one eye 201 that drives a well are connected to, and the other end and the main shaft two eye 102 that drives a well are connected to;The service shaft two is opened Wellbore 203 is located at gas hydrates reservoir 4.
In this way, the major-minor well construction of deep water shallow layer gas hydrate exploitation is put down by a bite straight well main borehole, the horizontal saliva of several mouths Well service shaft eye and several mouthfuls of main shafts dock wellbore composition with service shaft, wherein several saliva horizontal well service shaft eyes and several mouthfuls of main shafts with it is auxiliary The quantity that well docks wellbore is equal, and the horizontal segment of horizontal well service shaft eye (i.e. service shaft two drive a well eye) is in hydrate reservoir, main shaft Straight well main borehole and horizontal well service shaft eye are connected to service shaft docking wellbore, also allow for major-minor well oil gas (gas hydrates) Channel connection, all horizontal well service shaft eyes, main shaft and service shaft dock wellbore and straight well main borehole finishing drilling after, in horizontal well service shaft Eye well head stamps cement plug shut-in well, carries out oil gas (gas hydrates) production in straight well main borehole well head tripping in wellhead assembly.
In the embodiment shown in fig. 1, the major-minor well construction of deep water shallow layer gas hydrate exploitation further includes main borehole Conduit 6, main borehole two open casing 7, service shaft eye one opens casing 8, main borehole docks casing 9 with service shaft eye and service shaft eye two opens set Pipe 10, the main borehole conduit 6 are set to the main shaft one and drive a well in eye 101, and the side wall for the eye 101 that drives a well with the main shaft one Form main borehole conduit bore hole annulus 11;The main borehole two, which opens casing 7 and is set to the main shaft two, to drive a well in eye 102, and on Portion passes through the main borehole conduit 6;What the main borehole conduit 6 and the main borehole two opened casing 7 protrudes into main borehole conduit 6 Part is fixed;The main borehole two is opened the drive a well side wall of eye 102 of another part of casing 7 and the main shaft two and is fixed;It is described auxiliary Wellbore one, which opens casing 8 and is set to the service shaft one, to drive a well in eye 201, and the main borehole docks casing 9 with service shaft eye and is set to institute It states main shaft to dock with service shaft in wellbore 3, the service shaft eye two, which opens casing 10 and is set to the service shaft two, to drive a well in eye 202;It is described The lower end that service shaft eye one opens casing 8 is connected to one end that the service shaft eye two opens casing 10;The main borehole is docked with service shaft eye One end of casing 9 is opened casing 8 with the service shaft eye one and is connected to, and the other end is opened casing 7 with the main borehole two and is connected to;The service shaft Eye one is opened the drive a well side wall of eye 201 of casing 8 and the service shaft one and is fixed.
Herein, (including main borehole conduit, main borehole two open casing to casing, service shaft eye one opens casing, main borehole and service shaft Eye docking casing and service shaft eye two open casing) effect be well cementation act on, to prevent from the borehole wall occur during drilling well The accidents such as unstability, well slough, leakage occur.
In the embodiment shown in fig. 1, the major-minor well construction of deep water shallow layer gas hydrate exploitation further includes service shaft lid Cap cement plug 12, the service shaft nut cap cement plug 12 is set to the service shaft eye one and opens at the upper opening of casing 8, for blocking Service shaft eye one opens the upper opening of casing 8, is discharged with preventing gas hydrates from opening casing 8 from service shaft eye one.
Due to being to carry out natural gas hydration from straight well main borehole tripping in quarrying apparatus when exploitation of gas hydrate Therefore the collection of object blocks the opening (or blocking the upper opening that service shaft eye one opens casing) of horizontal well service shaft eye, is conducive to day Right gas hydrate is discharged from the opening of straight well main borehole, to also be advantageous for collecting gas hydrates.
In the embodiment shown in fig. 1, what the main borehole conduit 6 and the main borehole two opened casing 7 protrudes into main borehole The fixed form of the part of conduit 6, the main borehole two open another part of casing 7 and the main shaft two the drives a well side of eye 102 The fixed form of wall and the service shaft eye one open the drive a well fixed form of side wall of eye 201 of casing 8 and the service shaft one It is poured by cement, and cement is returned to seabed mud line.It is fixed by the way of cement pouring, it is very simple and convenient, and Fixed effect is good, occurs borehole well instability, well slough, leakage etc. during drilling well to also just avoid to a certain extent Accident occurs.
In the embodiment shown in fig. 1, the major-minor well construction of deep water shallow layer gas hydrate exploitation further includes service shaft sieve Pipe 13, the service shaft screen casing 13 are set to the service shaft two and drive a well in eye 202, and one end and the service shaft eye two open casing 10 Free end connection.The setting of service shaft screen casing can effectively prevent from the sand mud of hydrate reservoir from entering service shaft eye two opening in casing, from And it blocks service shaft eye two and opens casing.
In the embodiment shown in fig. 1, the horizontal well service shaft eye 2 is multiple, (being two in Fig. 1), multiple water Horizontal well service shaft eye 2 is located at the two sides of the straight well main borehole 1;Correspondingly, it is more that the main shaft, which docks wellbore 3 with service shaft also, It is a, and quantity is identical as the quantity of the horizontal well service shaft eye 2.Multiple horizontal well service shaft eyes can work at the same time, and just increase in this way Economic benefit is added, so that the production capacity of gas hydrates increases.
In the embodiment shown in fig. 1, the service shaft two drive a well eye 202 be it is multiple, multiple service shafts two drive a well eye 202 Drive a well respectively with the service shaft one lower end of eye 201 of one end be connected to.Multiple service shafts two drive a well eye 202 setting also for increasing Add the production capacity of gas hydrates, to increase economic benefit.
The present invention also provides a kind of deep water shallow layer gas hydrate recovery methods, include the following steps:
Step 1: hiding the determining horizontal well in conjunction with straight well main borehole of development plan according to deep water shallow layer gas hydrate The ligancy of service shaft eye.
It among these, can fully consider reservoir geology data and horizontal well drilling technique requirement, complete casing programme and set Meter.Mainly need to consider the distribution ratio of straight well main borehole and horizontal well service shaft eye, horizontal segment (the i.e. service shaft two of horizontal well service shaft eye Open borehole segments) distributed number and parameter configuration, and size and the completion mode etc. for determining casings at different levels.
Step 2: carrying out straight well main borehole drillng operation, drive a well after eye firstly, drilling through main shaft one, tripping in main borehole conduit; Then, it drills through main borehole two to drive a well after eye, tripping in main borehole two opens casing;It is opened finally, opening casing in main borehole two with main shaft two Casting cement between the side wall of wellbore, and cement is returned to seabed mud line, is cemented the well to straight well main borehole.
Among these, main shaft one drives a well eye using 36 cun of casing jet drillings or lower suction anchor, bores in deep water surface pipe In well operations, all difficulties for using injection tripping in mode that can meet with effective solution shallow-layer operation have without cementing the well, zero Discharge and it is environmentally friendly.The advantages that greatly shortening the activity duration, being further reduced down-hole accident.Main shaft two drives a well eye using 26 cun of wellbores Drill bit completes drilling to purpose of horizon, and 20 cun of casings of tripping in after finishing drilling, straight well main borehole drillng operation is completed.In conjunction with well bore knot Structure completes well cementing operation, and tripping in transmitter, tripping in transmitter is the positioning of horizontal well service shaft eye connection for convenience herein.
Step 3: mobile drilling platforms, carries out horizontal well service shaft eye drillng operation, drive a well eye firstly, drilling through service shaft one, under Enter service shaft eye one and open casing, service shaft eye one open casing and service shaft one drive a well eye side wall between casting cement, and cement return to Seabed mud line cements the well to the eye that drives a well of service shaft one;Then, service shaft one drive a well now portion carry out sidetracking, drill through service shaft one and open Wellbore and main shaft two main shaft that eye is connect that drives a well dock wellbore with service shaft, and tripping in main borehole docks casing with service shaft eye, and makes Main borehole is opened casing with main borehole two with one end of service shaft eye docking casing and is connected to, and the other end is opened casing with service shaft eye one and is connected to; It drives a well eye finally, drilling through service shaft two, opens a window in the lower part that service shaft eye one opens casing, carry out side in gas hydrates reservoir It bores, tripping in service shaft eye two opens casing, so that one end that service shaft eye two opens casing is opened casing with service shaft eye one and is connected to.
Among these, the eye that drives a well of service shaft one is to be crept into using 17-1/2 wellbore to design well depth, and drilling well uses after completing Casing cementing.Main shaft, which docks wellbore with service shaft, selects the docking of 12-1/4 wellbore.After completing docking borehole segments drilling well, tripping in Casing simultaneously does suspension design.It drives a well at the moment drilling through service shaft two, selects 13-3/8 casing to open a window, using small curvature Super short radial horizontal well drilling directly carries out drilling well in gas hydrates purpose of horizon.
Step 4: opening service shaft eye two, casing carries out perforating job or screen casing is mounted on service shaft eye by slot, tripping in screen casing Two open the free end of casing.
Step 5: squeezing into cement at the upper opening that service shaft eye one opens casing, service shaft nut cap cement plug is formed.Oil gas (gas hydrates) can only dock the lower part that wellbore enters straight well main borehole by main shaft with service shaft.
Step 6: arranging the device of exploitation of gas hydrate at the well head of straight well main borehole, and tripping in test string.
Step 7: installing the supporting tool of all exploitation of gas hydrate, production testing operation is carried out.
Compared with prior art, the present invention has the following advantages that:
(1) when exploiting deep water shallow layer gas hydrate resource, flow string and monitoring tubing string is separated, electricity is eliminated The limitations of the flow strings to the auxiliary Hole clean of horizontal well and well structure design such as latent pump.
(2) combine straight well exploitation and the advantages of horizontal well development, straight well main borehole size be big, can tripping in large scale pump, Oil-production capacity is improved, the hydrate reservoir range that horizontal well feeds through to is wider, it can further improve gas hydrates production capacity, Improve gas hydrates recovery ratio
(3) for the reservoir that easily shakes out, the sand setting pocket in straight well shaft bottom can be alleviated largely shaked out due to stratum caused by The case where completion tubular columns such as screen casing are buried by sand.
(4) service shaft one drives a well eye using open circuit drilling process, and service shaft two drives a well eye using casing drilling, is suspended on upper layer pipe It near shoes and does not cement the well, has not only met exploitation and required but also improve brill completion efficiency, reduced drilling cost.
(5) service shaft and main shaft dock wellbore using casing drilling and do not cement the well, and improve entire major-minor well combination horizontal well The efficiency of recovery method.
It will be apparent to those skilled in the art that can make various other according to the above description of the technical scheme and ideas Corresponding change and deformation, and all these changes and deformation all should belong to the protection scope of the claims in the present invention Within.

Claims (10)

1. a kind of major-minor well construction of deep water shallow layer gas hydrate exploitation, which is characterized in that including being set to seabed mud line Straight well main borehole, at least one horizontal well service shaft eye and at least one main shaft below dock wellbore with service shaft;
The straight well main borehole includes that main shaft one drives a well eye and main shaft two drives a well eye, the main shaft one drive a well eye lower part with it is described Main shaft two drives a well the top connection of eye, and the drive a well diameter of cross section of eye of the main shaft one is greater than main shaft two and drives a well the cross section of eye Diameter;
The horizontal well service shaft eye includes that service shaft one drives a well eye and at least one service shaft two drives a well eye, and the service shaft one drives a well eye Drive a well one end of eye of lower end and the service shaft two is connected to;
One end of the main shaft and service shaft docking wellbore and the service shaft one eye that drives a well are connected to, and the other end drives a well with the main shaft two Eye connection;
The service shaft two eye that drives a well is located at gas hydrates reservoir.
2. the major-minor well construction of deep water shallow layer gas hydrate exploitation according to claim 1, which is characterized in that also wrap Include main borehole conduit, main borehole two opens casing, service shaft eye one opens casing, main borehole docks casing and service shaft eye two with service shaft eye Casing is opened,
The main borehole conduit is set to the main shaft one and drives a well in eye, and forms main shaft with the drive a well side wall of eye of the main shaft one Eye conduit bore hole annulus;
The main borehole two, which opens casing and is set to the main shaft two, to drive a well in eye, and top passes through the main borehole conduit;
The part for protruding into main borehole conduit that the main borehole conduit opens casing with the main borehole two is fixed;The main borehole two The drive a well side wall of eye of another part of casing and the main shaft two is opened to fix;
The service shaft eye one, which opens casing and is set to the service shaft one, to drive a well in eye, and the main borehole docks casing setting with service shaft eye It is docked in wellbore in the main shaft with service shaft, the service shaft eye two, which opens casing and is set to the service shaft two, to drive a well in eye;
The lower end that the service shaft eye one opens casing is connected to one end that the service shaft eye two opens casing;The main borehole and service shaft eye One end of docking casing is opened casing with the service shaft eye one and is connected to, and the other end is opened casing with the main borehole two and is connected to;
The service shaft eye one is opened the drive a well side wall of eye of casing and the service shaft one and is fixed.
3. the major-minor well construction of deep water shallow layer gas hydrate exploitation according to claim 2, which is characterized in that also wrap Service shaft nut cap cement plug is included,
The service shaft nut cap cement plug is set to the service shaft eye one and opens at the upper opening of casing, opens for blocking service shaft eye one The upper opening of casing, to prevent gas hydrates from opening casing discharge from service shaft eye one.
4. the major-minor well construction of deep water shallow layer gas hydrate exploitation according to claim 2, which is characterized in that
The main borehole conduit and the main borehole two open the fixed form of the part for protruding into main borehole conduit of casing, the master Wellbore two open casing another part and the main shaft two drive a well eye side wall fixed form and the service shaft eye one open set The drive a well fixed form of side wall of eye of pipe and the service shaft one is to be poured by cement, and the upper end of cement and seabed mud line are put down Together.
5. the major-minor well construction of deep water shallow layer gas hydrate exploitation according to claim 4, which is characterized in that also wrap Service shaft screen casing is included,
The service shaft screen casing is set to the service shaft two and drives a well intraocularly, and one end and the service shaft eye two open the free end company of casing It connects.
6. the major-minor well construction of deep water shallow layer gas hydrate exploitation according to claim 1, which is characterized in that
The horizontal well service shaft eye be it is multiple, multiple horizontal well service shaft eyes are located at the two sides of the straight well main borehole; Correspondingly, it is multiple that the main shaft, which docks wellbore with service shaft also, and quantity is identical as the quantity of the horizontal well service shaft eye.
7. the major-minor well construction of deep water shallow layer gas hydrate exploitation according to claim 1, which is characterized in that
The service shaft two drive a well eye be it is multiple, drive a well one end of eye of multiple service shafts two drives a well with the service shaft one eye respectively Lower end connection.
8. a kind of deep water shallow layer gas hydrate recovery method, which is characterized in that include the following steps:
1) the determining horizontal well service shaft eye in conjunction with straight well main borehole of development plan is hidden according to deep water shallow layer gas hydrate Ligancy;
2) straight well main borehole drillng operation is carried out, is driven a well after eye firstly, drilling through main shaft one, tripping in main borehole conduit;Then, it drills through Main borehole two drives a well after eye, and tripping in main borehole two opens casing;Finally, opening casing in main borehole two and main shaft two drives a well the side wall of eye Between casting cement, and cement is returned to seabed mud line, is cemented the well to straight well main borehole;
3) mobile drilling platforms carries out horizontal well service shaft eye drillng operation, drives a well eye firstly, drilling through service shaft one, tripping in service shaft eye One opens casing, service shaft eye one open casing and service shaft one drive a well eye side wall between casting cement, and cement is returned to seabed mud line, It cements the well to the eye that drives a well of service shaft one;Then, sidetracking is carried out in the portion now that drives a well of service shaft one, drills through service shaft one and drives a well eye and main shaft Two drive a well eye connection main shafts wellbore is docked with service shaft, tripping in main borehole docks casing with service shaft eye, and make main borehole with it is auxiliary One end of wellbore docking casing is opened casing with main borehole two and is connected to, and the other end is opened casing with service shaft eye one and is connected to;Finally, drilling through auxiliary Well two drives a well eye, opens a window in the lower part that service shaft eye one opens casing, carries out sidetracking, tripping in service shaft in gas hydrates reservoir Eye two opens casing, so that one end that service shaft eye two opens casing is opened casing with service shaft eye one and is connected to.
9. deep water shallow layer gas hydrate recovery method according to claim 8, which is characterized in that after step 3) It further include following steps:
4) after opening casing progress perforating job or slot to service shaft eye two, screen casing is mounted on service shaft eye two and opens set by tripping in screen casing The free end of pipe.
10. deep water shallow layer gas hydrate recovery method according to claim 9, which is characterized in that step 4) it After further include following steps:
5) cement is squeezed at the upper opening that service shaft eye one opens casing, forms service shaft nut cap cement plug;
6) device of exploitation of gas hydrate, and tripping in test string are arranged at the well head of straight well main borehole;
7) supporting tool for installing all exploitation of gas hydrate, carries out production testing operation.
CN201810979981.7A 2018-08-24 2018-08-24 The major-minor well construction and its method of deep water shallow layer gas hydrate exploitation Pending CN108894765A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110029968A (en) * 2019-04-08 2019-07-19 中国石油大学(华东) For drilling through hydrate Microdrilling and the quickly device and working method of complete well
CN110043229A (en) * 2019-04-02 2019-07-23 广州海洋地质调查局 A kind of more well group connection convergence recovery methods of Gas Hydrate In Sea Areas
CN111734359A (en) * 2020-07-28 2020-10-02 广州海洋地质调查局 Natural gas hydrate horizontal branch well exploitation method based on deepwater suction anchor

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110043229A (en) * 2019-04-02 2019-07-23 广州海洋地质调查局 A kind of more well group connection convergence recovery methods of Gas Hydrate In Sea Areas
CN110029968A (en) * 2019-04-08 2019-07-19 中国石油大学(华东) For drilling through hydrate Microdrilling and the quickly device and working method of complete well
CN111734359A (en) * 2020-07-28 2020-10-02 广州海洋地质调查局 Natural gas hydrate horizontal branch well exploitation method based on deepwater suction anchor

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