AU2021104224A4 - Sectional Cementing Technology for Deep Trona Drilling and Mining - Google Patents
Sectional Cementing Technology for Deep Trona Drilling and Mining Download PDFInfo
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- AU2021104224A4 AU2021104224A4 AU2021104224A AU2021104224A AU2021104224A4 AU 2021104224 A4 AU2021104224 A4 AU 2021104224A4 AU 2021104224 A AU2021104224 A AU 2021104224A AU 2021104224 A AU2021104224 A AU 2021104224A AU 2021104224 A4 AU2021104224 A4 AU 2021104224A4
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- Australia
- Prior art keywords
- cementing
- stage
- deep
- drilling
- cement
- Prior art date
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- 238000005065 mining Methods 0.000 title claims abstract description 23
- 238000005553 drilling Methods 0.000 title claims abstract description 17
- 238000005516 engineering process Methods 0.000 title claims abstract description 13
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 title claims abstract description 12
- 241001625808 Trona Species 0.000 title claims abstract description 12
- 239000004568 cement Substances 0.000 claims abstract description 31
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 27
- 238000000034 method Methods 0.000 claims abstract description 16
- 239000002002 slurry Substances 0.000 claims abstract description 14
- 230000008878 coupling Effects 0.000 claims description 6
- 238000010168 coupling process Methods 0.000 claims description 6
- 238000005859 coupling reaction Methods 0.000 claims description 6
- 210000002445 nipple Anatomy 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 230000015271 coagulation Effects 0.000 claims description 3
- 238000005345 coagulation Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 239000007788 liquid Substances 0.000 description 5
- 235000002639 sodium chloride Nutrition 0.000 description 5
- 150000003839 salts Chemical class 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 239000003129 oil well Substances 0.000 description 3
- 238000003825 pressing Methods 0.000 description 2
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000010446 mirabilite Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
- E21B33/14—Methods or devices for cementing, for plugging holes, crevices or the like for cementing casings into boreholes
- E21B33/16—Methods or devices for cementing, for plugging holes, crevices or the like for cementing casings into boreholes using plugs for isolating cement charge; Plugs therefor
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
- E21B33/14—Methods or devices for cementing, for plugging holes, crevices or the like for cementing casings into boreholes
- E21B33/146—Stage cementing, i.e. discharging cement from casing at different levels
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/1204—Packers; Plugs permanent; drillable
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/126—Packers; Plugs with fluid-pressure-operated elastic cup or skirt
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/005—Monitoring or checking of cementation quality or level
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention discloses a sectional cementing technology for deep trona drilling and mining,
which comprises the following steps. Firstly, the whole wellbore is segmented, and a formation
packer and a stage collar are installed in series on a cementing casing. Then, the lower casing
section is sealed by positive circulation method. Firstly, open the formation packer rubber plug
to seal it with the borehole wall and cut off the cement down channel, then open the stage collar
to start the first-stage cementing operation. After the cement slurry is injected, close the stage
collar, and the upper section is subjected to the second-stage cementing operation after the
initial setting of the cement slurry, until the cement is solidified, the rubber plug is drilled to
run the central pipe for completion. According to the invention, the whole well is divided into
two part according to geological conditions and downhole conditions. Therefore, the problems
of high pressure strength, easy lost circulation of formation or low return of cement slurry on
the upper part of the leaking layer in the previous primary cementing process are solved, the
well completion quality is greatly improved, and the service life of the production well is
prolonged.
1/7
FIGURES
-1
v3
10 4
6 5
11
Figure 1
Description
1/7
-1
v3
10 4
6 5
11
Figure 1
Sectional Cementing Technology for Deep Trona Drilling and Mining
The invention belongs to the technical field of deep drilling, solution mining, well
construction and sectional cementing technology of trona mines, and particularly relates
to a sectional cementing technology for deep trona drilling and mining.
At present, for the mining of deep-buried soluble salt deposits (trona, mirabilite, rock salt,
etc.), the drilling solution mining method is adopted at home and abroad. Namely, drilling
equipment is used to drill the bit to the target layer through drill pipe, then technical
casing and production casing are respectively set down, oil well cement is used for
cementing respectively, then central pipe is set down and wellhead device is installed,
thus completing the construction process of a production well.
The wellbore structure of natural alkali well basically draws lessons from the wellbore
structure of oil well, and its cementing method and technology are basically the same as
those of oil well, adopting cement positive circulation cementing method. However, with
the continuous increase of mining solubility (more than 2500m), the static pressure at the
bottom of the well reaches over 30Mpa. With the continuous increase of mining time, the
underground formation are constantly changing, and water gushing or leaking occurs in
many wells. The underground situation is becoming more and more complex, and the
formation structural belt forms the phenomenon of gushing and leaking in the same layer,
which brings great challenges to cementing work. The original cementing methods and
techniques can no longer adapt to the existing complex geological situation. Due to the depth of the well, the pressure strength of cement slurry at the bottom of primary cementing is too high (over 40MPa), which is easy to cause lost circulation of formation, or lead to the leakage of cement slurry in the water gushing section, resulting in the low back plug surface of the cement slurry or the unsatisfactory return of back plug surface.
Therefore seriously reduces the well completion quality and affects the mining of the
deposit.
In order to overcome the above shortcomings of the prior art, the invention provides a
sectional cementing technology for deep trona drilling and mining. It thoroughly solves
the problem of poor well-forming quality in deep soluble salt deposit mining and solution
mining by dividing each section of the wellbore and adopting a sectional cementing
method, and improves the cementing quality.
In order to achieve the above object, the technical scheme adopted by the invention is that
a sectional cementing technology for deep trona drilling and mining comprises the
following steps. Firstly, the whole wellbore is segmented, which is generally selected at
the position 50-80 meters above the leaking layer or water gushing layer, and a formation
packer and a stage collar are installed in series on the cementing casing. Then, the lower
casing section is sealed by the method of positive circulation. Firstly, open the rubber
plug of the formation packer to seal it with the borehole wall and cut off the cement down
channel. Then, open the stage collar and start the first-stage cementing operation. After
the cement slurry is injected, close the stage collar. After the initial setting of the cement
slurry, perform the second-stage cementing operation on the upper well section. After the cement is solidified, drill the rubber plug and run the central pipe for well completion.
Finally, dismantle the manifold and wait for coagulation. Run the roller bit and drill
accessories, and then conduct acoustic amplitude logging to check the cementing quality.
Furthermore, the formation packer is at the bottom, and the stage collar is at the top, with
a distance of one casing in the middle.
Furthermore, after the first-stage cementing operation is completed, the second-stage
cementing operation can be carried out after initial setting for one hour.
Furthermore, the formation packer comprises a coupling, a central pipe, a rubber pipe, a
valve body and a nipple which are designed in sequence from top to bottom. The
coupling, the rubber pipe and the valve body are sleeved on the outer wall of the central
pipe from top to bottom. The bottom of the valve body is connected with the nipple. The
valve body comprises a pressure limiting valve, a one-way valve and a locking valve, and
a disconnect rod is arranged on the valve body.
Compared with the prior art, the invention has the following advantages.
According to the geological conditions and downhole conditions, the whole well is
divided into two parts. Therefore, the problems of high pressure strength, easy lost
circulation of formation or low return of cement slurry on the upper part of the leaking
layer in the previous primary cementing process are solved, the well completion quality is
greatly improved, and the service life of the production well is prolonged. According to
the invention, each section of the wellbore is divided, and a sectional cementing method
is adopted. Therefore, the problem of poor well completion quality in deep soluble salt
deposit mining, drilling and solution mining is thoroughly solved, and the cementing quality is improved. Especially, the invention is very practical for deep drilling and solution mining cementing. It solves the problem that cement in deep and ultra-deep wells can not return when cementing due to lost circulation of formation, and the cement in the leaking layer can't return. It brings great convenience to the working zone.
In order to explain the embodiments of this application or the technical solutions in the
prior art more clearly, the drawings required in the embodiments or the prior art
description will be briefly introduced below. Obviously, the drawings in the following
description are only some embodiments described in this application, and other drawings
can be obtained according to these drawings for ordinary technicians in this field without
paying creative labor.
Figure 1 A schematic structural diagram of the formation packer of the present invention
Figure 2 A schematic view showing the appearance of the stage collar of the present
invention
Figure 3 A schematic diagram of the flexible plug structure of the present invention
Figure 4 A schematic structural diagram of the flexible plug seat of the present invention
Figure 5 A schematic structural diagram of the gravity type opening plug of the present
invention
Figure 6 A schematic structural diagram of the closure plug of the present invention
Figure 7 A schematic diagram showing the structure of the displacement rubber plug of
the present invention
The following will be described in detail with reference to the technical scheme in the
embodiment of the present invention.
Referring to Figure 1, the formation packer comprises a coupling 1, a central pipe 2, a
rubber pipe 3, a valve body 4 and a nipple 9 which are sequentially designed from top to
bottom. Wherein the coupling 1, the rubber pipe 3 and the valve body 4 are sleeved on
the outer wall of the central pipe 2 from top to bottom. A nipple 9 is connected to the
bottom of the valve body 4. The valve body 4 includes a pressure limiting valve 5, a one
way valve 6 and a locking valve 7, and a disconnect rod 8 is arranged on the valve body
4. In the construction process, when a displacement rubber plug 10 passes through the
formation packer valve body 4, the disconnect rod 8 sealed on the liquid inlet hole is
broken. When the displacement rubber plug 10 is transported to the choke plate 11, a seal
is formed in the casing (the pipe string structure such as ball throwing or blind plate can
also be used to form a seal in the casing, because there is no rubber plug passing through
these process pipe string structures, the disconnect rod must be removed in advance).
When the pressure is suppressed, liquid enters the locking valve 7 through the liquid inlet
hole of the valve system. When the pressure reaches the set value, the pin on the locking
valve 7 is cut off, the locking valve 7 is opened, and the one-way valve 6 is also opened.
The liquid enters the expansion chamber between the central pipe 2 and the rubber pipe 3
through the pressure limiting valve 5, so that the formation packer expands and closely
contacts the well wall to form a seal. When the pressure in the expansion chamber
reaches the set value of the pin of the pressure limiting valve 5, the pin is cut off and the
pressure limiting valve 5 closes to seal the liquid inlet hole. At this time, the pressure in the casing has no influence on the pressure in the expansion chamber, thus realizing safe seating, zero wellhead pressure relief and automatic locking of the locking valve 7, thus realizing permanent closure.
Referring to Figure 1-7, the specific work flow of the present invention is as follows.
Firstly, the whole wellbore is segmented, which is generally selected at the position of
-80m above the leaking layer or water gushing layer. The above-mentioned formation
packer and stage collar are connected in series on the cementing pipe string, with the
formation packer at the bottom and the stage collar at the top, with a distance of one
casing in the middle. The lowering position of the formation packer is lowered into the
well according to the pre-designed predetermined well depth as required. After the pipe
string enters the well, it is connected to the ground manifold and the equipment is on
standby. Then adopt the method of positive circulation to circulate mud to ensure the
smooth flow of manifold. According to the requirements of cementing design, perform
the first-stage cementing operation on the lower section (below the formation packer),
and perform initial setting for one hour after completion. After the cement slurry is
injected, close the stage collar. After the initial setting of the cement slurry, perform the
second-stage cementing operation on the upper section. After the cement is solidified,
drill the rubber plug and run the central pipe for completion. Finally, dismantle the
manifold and wait for coagulation. Run the roller bit and drill accessories, and then
conduct acoustic amplitude logging to check the cementing quality.
According to the above-mentioned operating rules of formation packer, first open packer
rubber plug to seal it with the well wall, and cut off cement down channel to ensure cement only has up channel, then open stage collar circulation hole, start pump circulation, check whether formation packer and well wall are sealed and up channel is unblocked, install flexible plug in cement head through flexible plug seat, and then carry out first-stage cementing operation according to cementing design requirements. Release pressure from wellhead by pressing flexible plug, displacing mud, bumping pressure and stopping pump, then throw in gravity to open plug and install closure plug in cement head. When gravity plug seat is expected to be seated on sliding sleeve below the stage collar, start pump to suppress pressure, open circulating hole of stage collar to circulate, and carry out second-stage cementing operation according to cementing design requirements. After cement slurry injection, release the pressure from the wellhead by pressing closure plug, displacing mud, bumping pressure and stopping pump. Then release the pressure from the wellhead until the circulating hole of the stage collar is closed, and finally check whether the closing sleeve is really closed.
The technology of the invention is suitable for drilling and solution mining of soluble salt
deposits. Especially, it is very practical for deep drilling, solution mining and cementing.
It solves the problem that cement in deep and ultra-deep wells can not return due to lost
circulation of formation, and the cement in the leaking layer can't return. It brings great
convenience to the working zone.
The above is only the specific embodiment of this application, and it should be pointed
out that ordinary people in this technical field can make some improvements and
embellishments without departing from the principles of this application, and these
improvements and embellishments should also be regarded as the protection scope of this
application.
Claims (4)
1. A sectional cementing technology for deep trona drilling and mining, characterized by
comprising the following steps: firstly, the whole wellbore is segmented, generally
selected at the position 50-80m above the leaking layer or water gushing layer, and a
formation packer and a stage collar are installed in series on the cementing casing; then,
the lower casing section is sealed by positive circulation method, first, open the formation
packer rubber plug to seal it with the borehole wall and cut off the cement down channel,
then open the stage collar to start the first-stage cementing operation, and after the cement
slurry is injected, close the stage collar again; after the initial setting of the cement slurry,
perform the second-stage cementing operation on the upper section; after the cement is
solidified, drill the rubber plug and run the central pipe for completion; finally, dismantle
the manifold and wait for coagulation; run the roller bit and drill accessories, and then
conduct acoustic amplitude logging to check the cementing quality.
2. The sectional cementing technology for deep trona drilling and mining according to
Claim 1, characterized in that the formation packer is at the bottom, the stage collar is at
the top, and the middle can be separated by a casing.
3. The sectional cementing technology for deep trona drilling and mining according to
Claim 1, characterized in that after the first-stage cementing operation is completed, the
second-stage cementing operation can be carried out after initial setting for one hour.
4. The sectional cementing technology for deep trona drilling and mining according to
Claim 1, characterized in that the formation packer comprises a coupling, a central pipe, a
rubber pipe, a valve body and a nipple which are designed in sequence from top to bottom, wherein the coupling, the rubber pipe and the valve body are sleeved on the outer wall of the central pipe from top to bottom; the bottom of the valve body is connected with the nipple; and the valve body comprises a pressure limiting valve, a one-way valve and a locking valve, and a disconnect rod is arranged on the valve body.
FIGURES 1/7
Figure 1
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2021104224A AU2021104224A4 (en) | 2021-07-16 | 2021-07-16 | Sectional Cementing Technology for Deep Trona Drilling and Mining |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2021104224A AU2021104224A4 (en) | 2021-07-16 | 2021-07-16 | Sectional Cementing Technology for Deep Trona Drilling and Mining |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AU2021104224A4 true AU2021104224A4 (en) | 2021-09-09 |
Family
ID=77589192
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2021104224A Active AU2021104224A4 (en) | 2021-07-16 | 2021-07-16 | Sectional Cementing Technology for Deep Trona Drilling and Mining |
Country Status (1)
| Country | Link |
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| AU (1) | AU2021104224A4 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115977617A (en) * | 2023-03-22 | 2023-04-18 | 中海油田服务股份有限公司 | Casing pipe outer serial slot identification method and device, computing equipment and storage medium |
-
2021
- 2021-07-16 AU AU2021104224A patent/AU2021104224A4/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115977617A (en) * | 2023-03-22 | 2023-04-18 | 中海油田服务股份有限公司 | Casing pipe outer serial slot identification method and device, computing equipment and storage medium |
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