CN107035338B - Annular space is counter infuses backward extrusion blocking method for a kind of fine sand leak stopping slurry - Google Patents
Annular space is counter infuses backward extrusion blocking method for a kind of fine sand leak stopping slurry Download PDFInfo
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- CN107035338B CN107035338B CN201710333423.9A CN201710333423A CN107035338B CN 107035338 B CN107035338 B CN 107035338B CN 201710333423 A CN201710333423 A CN 201710333423A CN 107035338 B CN107035338 B CN 107035338B
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- leak stopping
- fine sand
- annular space
- counter
- backward extrusion
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- 239000004576 sand Substances 0.000 title claims abstract description 47
- 239000002002 slurry Substances 0.000 title claims abstract description 42
- 238000001125 extrusion Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000000903 blocking effect Effects 0.000 title claims abstract description 13
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 32
- 238000005553 drilling Methods 0.000 claims abstract description 20
- 230000000694 effects Effects 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 25
- 238000007789 sealing Methods 0.000 claims description 19
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 12
- 239000003292 glue Substances 0.000 claims description 7
- 229920002521 macromolecule Polymers 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 6
- 230000001737 promoting effect Effects 0.000 claims description 4
- 229920000742 Cotton Polymers 0.000 claims description 3
- 230000001154 acute effect Effects 0.000 claims description 3
- 239000010445 mica Substances 0.000 claims description 3
- 229910052618 mica group Inorganic materials 0.000 claims description 3
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 2
- 230000005484 gravity Effects 0.000 abstract description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 208000010392 Bone Fractures Diseases 0.000 description 1
- 206010017076 Fracture Diseases 0.000 description 1
- 206010018852 Haematoma Diseases 0.000 description 1
- 235000009827 Prunus armeniaca Nutrition 0.000 description 1
- 244000018633 Prunus armeniaca Species 0.000 description 1
- 241001074085 Scophthalmus aquosus Species 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000013065 commercial product Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000007613 slurry method Methods 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000725 suspension Substances 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
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/426—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells for plugging
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Chemical & Material Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Geochemistry & Mineralogy (AREA)
- Sealing Material Composition (AREA)
Abstract
The present invention provides a kind of fine sand leak stopping slurry, annular space is counter infuses backward extrusion blocking method, adaptable to different leakage channels, improves leakage agent to the matching capacity of leakage channel, can squeeze into different leakage channels；Fine sand in leak stopping slurry is easily accumulated in crack, and high-intensitive leak stopping wall is formed after squeeze seal, is not easy leakage recurrence.Backward extrusion is infused from annular space is counter, since the presence of drilling tool in well reduces leak stopping slurry scope of activities, leak stopping slurry is forced to be easier to enter in drop ply.Empty anti-note backward extrusion more meets the characteristics of high density fine sand leak stopping slurry gravity sinks, and slurry sinking watching can be freely accessible to drop ply, then be squeezed by closing well, and more leak stopping slurries is forced to enter in drop ply.
Description
Technical field
The invention belongs to petroleum drilling technology fields, and in particular to annular space is counter infuses backward extrusion leak stopping side for a kind of fine sand leak stopping slurry
Method.
Background technique
Long celebrating Xifeng Oilfield Jurassic system Luo He group buried depth of strata is 700~1100m, and vertically and horizontally fracture development is good,
Partial loss well pressurization sealing effect is undesirable, and main drop ply position is not easy to judge, part bulky grain sealing agent can not pass through brill
Have hydrophthalmia or deposition to shaft bottom, can not be efficiently entering in drop ply, squeeze seal pressure cannot intuitively react annular pressure.
1, partial loss leakage layer is more, and is not easy accurate judgement position
Repeatedly leakage occurs for partial loss well, and leak position is difficult to determine, so being difficult to determine deeply under drilling tool, often goes out
Sealing agent sedimentation bottom after just being squeezed after leakage layer under existing drilling tool；Or drilling tool is too far in the above distance of drop ply, shape in pit shaft after squeeze seal
At plug section, leak stopping slurry cannot be introduced into drop ply, form high pressure illusion.
2, existing conventional sealing agent bearing capacity is weak
Plugging material used at present has the coarse granules such as the agent of fiber-like pons hematoma, solidification cement sealing agent, apricot Hooke
Sealing agent, and determination is exactly that intensity is weaker jointly existing for these sealing agents, vulnerable to deformation after external force or is crushed.
3, positive injection forward extrusion blocking method existing defects
Positive injection forward extrusion blocking method generally uses drilling tool down toward the above position of drop ply, in this way due to well during squeeze seal
Cylinder volume is big, and leak stopping slurry scope of activities is wide, and most sealing agents are precipitated to shaft bottom after squeeze seal, and sealing agent utilization rate is low, leads to squeeze seal
Plugging effect is bad.
Summary of the invention
The purpose of the present invention is overcoming the above-mentioned problems in the prior art, propose a kind of suitable for Xifeng Oilfield Lip river
River group large size absorption well leak-stopping technique.
Technical solution provided by the invention is as follows:
Annular space is counter infuses backward extrusion blocking method for a kind of fine sand leak stopping slurry, comprising the following steps:
Step 1) polish drill rod, will be thin after connecting at drilling pump and kill manifold 10 meters more than whole drop ply positions
Sand plug spillage is at the uniform velocity pumped to annular space；
After step 2 fine sand leak stopping stock pump is sent, it is connected to drilling pump with mineshaft annulus by kill manifold, and remove
The upper water valve of two of drilling pump, retains the upper water valve of intermediate one, and adjustment is pumped into discharge capacity to 0.6-0.7m3/ min, closing well
Start that annular space is counter infuses backward extrusion；
Step 3) annular space is counter infuse backward extrusion during polish drill rod it is motionless, record squeezes into fine sand leak stopping slurry amount, every 10-15 point
Clock drives a well activity polish drill rod 3-5 minutes, annular space backward extrusion again later；
After step 4) infuses backward extrusion by the way that intermittent multiple annular space is counter, if casing pressure increases steadily, and pressure stabilizing in 4-6mpa up to 1
Minute or more, pressure drop is less than 1mpa after ten minutes, as extruding leak stopping success, completes leak stopping, otherwise continues to squeeze stifled to squeezing
It leaks successfully.
The fine sand leak stopping slurry is by Macromolecule glue elasticity sealing agent GD-3, blanc fixe, bridge plug agent, fine sand and water group
At；
Wherein, Macromolecule glue elasticity sealing agent GD-3 accounts for the 1% of water weight, and blanc fixe accounts for the 15% of water weight, bridge plug
Agent accounts for the 10 ~ 15% of water weight, and fine sand accounts for the 30% of water weight.
Activity polish drill rod described in step 3) includes promoting polish drill rod up and down and horizontally rotating polish drill rod, promotes drill finish up and down
The speed of bar is 8-15m/min, and boring disk by rotation drilling well horizontally rotates polish drill rod, revolving speed 60-90r/min.
The bridge plug agent is the mixing composite material being made of in any proportion cotton seed hulls, acute end, Pericarppium Armeniacae Amarum, mica sheet,
Particle size range 20-5 mesh.
The blanc fixe particle size range 20-200 mesh.
The fine sand be hard yellow ground for building, 2-3 millimeters of granularity.
The preparation process of fine sand leak stopping slurry are as follows: discharge water three point two of total amount in slurry commanding tank, start stirring on slurry commanding tank
Device is mixed, remaining one third water is recycled in slurry commanding tank by pump by waterpower mixing hopper, and sequentially adds the high score of formula ratio
Sub- gel elastomer sealing agent GD-3, blanc fixe, bridge plug agent, fine sand, after mixing evenly.
The beneficial effects of the present invention are:
1. adaptable to different leakage channels: it is logical to leakage to improve leakage agent for high capacity, the multistage solid phase material matched
The matching capacity in road can be squeezed into different leakage channels.
2. leak stopping intensity is high: the fine sand in leak stopping slurry is easily accumulated in crack, is formed high-intensitive leak stopping wall after squeeze seal, is not easy
Leakage recurrence.
3. infusing backward extrusion from annular space is counter, since the presence of drilling tool in well reduces leak stopping slurry scope of activities, leak stopping is forced to be starched
More easily enter in drop ply.
4. annular space is counter to be infused backward extrusion and more meet the characteristics of high density fine sand leak stopping slurry gravity sinks, slurry sinking watching can be with
It is freely accessible to drop ply, then is squeezed by closing well, more leak stopping slurries is forced to enter in drop ply.
It will be described in further details below.
Specific embodiment
Embodiment 1:
It present embodiments provides a kind of fine sand leak stopping slurry annular space is counter and infuse backward extrusion blocking method, comprising the following steps:
Step 1) polish drill rod, will be thin after connecting at drilling pump and kill manifold 10 meters more than whole drop ply positions
Sand plug spillage is at the uniform velocity pumped to annular space；
After step 2 fine sand leak stopping stock pump is sent, it is connected to drilling pump with mineshaft annulus by kill manifold, and remove
The upper water valve of two of drilling pump, retains the upper water valve of intermediate one, and adjustment is pumped into discharge capacity to 0.6-0.7m3/ min, closing well
Start that annular space is counter infuses backward extrusion；
Step 3) annular space is counter infuse backward extrusion during polish drill rod it is motionless, record squeezes into fine sand leak stopping slurry amount, every 10-15 point
Clock drives a well activity polish drill rod 3-5 minutes, annular space backward extrusion again later；
After step 4) infuses backward extrusion by the way that intermittent multiple annular space is counter, if casing pressure increases steadily, and pressure stabilizing in 4-6mpa up to 1
Minute or more, pressure drop is less than 1mpa after ten minutes, as extruding leak stopping success, completes leak stopping, otherwise continues to squeeze stifled to squeezing
It leaks successfully.
After leak stopping success, drive a well normal discharge capacity direct circulation, can also be with while removing extra fine sand leak stopping slurry in pit shaft
Wastage is monitored, wastage is less than 5m3/ h, that is, reach leak stopping purpose, and trip-out tripping in drill bit continues to creep into.
Wherein, drive a well activity polish drill rod purpose be activation the leak stopping of annular space fine sand slurry, while also destroy the borehole wall closure door and
The phenomenon that annular space is at plug section.Since the presence of drilling tool in well reduces leak stopping slurry scope of activities, anti-squeeze instead is infused using annular space
Pressure forces leak stopping slurry to be easier to enter in drop ply；And annular space it is counter infuse backward extrusion more meet high density fine sand leak stopping slurry gravity under
Heavy feature, slurry sinking watching can be freely accessible to drop ply, then be squeezed by closing well, and more leak stopping slurries is forced to enter leakage
In layer.
Embodiment 2:
On the basis of embodiment 1, it present embodiments provides a kind of fine sand leak stopping slurry annular space is counter and infuse backward extrusion blocking method,
Activity polish drill rod described in step 3) includes promoting polish drill rod up and down and horizontally rotating polish drill rod, promotes the speed of polish drill rod up and down
It is 8-15m/min, boring disk by rotation drilling well horizontally rotates polish drill rod, revolving speed 60-90r/min.
Embodiment 3:
On the basis of embodiment 1, fine sand leak stopping slurry by Macromolecule glue elasticity sealing agent GD-3, blanc fixe,
Bridge plug agent, fine sand and water composition；
Wherein, Macromolecule glue elasticity sealing agent GD-3 accounts for the 1% of water weight, and blanc fixe accounts for the 15% of water weight, bridge plug
Agent accounts for the 10 ~ 15% of water weight, and fine sand accounts for the 30% of water weight.
The preparation process of fine sand leak stopping slurry are as follows: it discharges water three point two of total amount in slurry commanding tank, starts the blender on slurry commanding tank,
Remaining one third water is recycled in slurry commanding tank by pump by waterpower mixing hopper, and sequentially adds the high-molecular gel of formula ratio
Elastic sealing agent GD-3, blanc fixe, bridge plug agent, fine sand, after mixing evenly.
Macromolecule glue elasticity sealing agent GD-3, which has, improves system viscosity and shear force effect, is commercial product, and opposite point
Son amount 750-850 ten thousand, manufacturer is the wide petrochemical industry Co., Ltd of North China petroleum, and the effect of blanc fixe is that raising system is close
Degree enhances suspending power, and the effect of bridge plug agent is suspension fine sand, blocks drop ply, and the effect of fine sand is filling crack.
Wherein, the bridge plug agent is compound for the mixing being made of in any proportion cotton seed hulls, acute end, Pericarppium Armeniacae Amarum, mica sheet
Material, particle size range 20-5 mesh.
The blanc fixe particle size range 20-200 mesh.
The fine sand be hard yellow ground for building, 2-3 millimeters of granularity.
There are within 2016 2 mouthfuls of oil wells in the case where conventional bridge plug and invalid gel leak stopping slurry pressurization sealing, has carried out fine sand
Annular space is counter infuses backward extrusion plugging test for leak stopping slurry, implements this technique 4 times, success rate achieves good plugging effect up to 75%.
Scene shows to improve the large-scale absorption well leak stopping success rate of Xifeng Oilfield Luo He group, is that effective solution Xifeng Oilfield Luo He group is large-scale
The leak-stopping technique of absorption well most.
The well-known components and common structure of component and the structure category industry that above embodiments do not describe in detail are common
Means do not describe one by one here.
The foregoing examples are only illustrative of the present invention, does not constitute the limitation to protection scope of the present invention, all
It is within being all belonged to the scope of protection of the present invention with the same or similar design of the present invention.
Claims (5)
1. a kind of fine sand leak stopping is starched, annular space is counter to infuse backward extrusion blocking method, which comprises the following steps:
After connecting at drilling pump and kill manifold, fine sand is blocked up 10 meters more than whole drop ply positions for step 1) polish drill rod
Spillage is at the uniform velocity pumped to annular space；
The fine sand leak stopping slurry is made of Macromolecule glue elasticity sealing agent GD-3, blanc fixe, bridge plug agent, fine sand and water；Its
In, Macromolecule glue elasticity sealing agent GD-3 accounts for the 1% of water weight, and blanc fixe accounts for the 15% of water weight, and bridge plug agent accounts for water weight
10 ~ 15%, fine sand accounts for the 30% of water weight；
After step 2 fine sand leak stopping stock pump is sent, it is connected to drilling pump with mineshaft annulus by kill manifold, and remove drilling well
The upper water valve of two of pump, retains the upper water valve of intermediate one, and adjustment is pumped into discharge capacity to 0.6-0.7m3/ min, closing well start
Annular space is counter to infuse backward extrusion；
Step 3) annular space is counter infuse backward extrusion during polish drill rod it is motionless, record squeeze into fine sand leak stopping slurry amount, opened every 10-15 minutes
Well activity polish drill rod 3-5 minutes, later annular space backward extrusion again；
After step 4) infuses backward extrusion by the way that intermittent multiple annular space is counter, if casing pressure increases steadily, and pressure stabilizing in 4-6mpa up to 1 minute
More than, after ten minutes pressure drop be less than 1mpa, as extruding leak stopping success, complete leak stopping, otherwise continue squeeze to squeeze leak stopping at
Function.
2. a kind of fine sand leak stopping according to claim 1 is starched, annular space is counter to infuse backward extrusion blocking method, it is characterised in that: step
3) activity polish drill rod described in includes promoting polish drill rod up and down and horizontally rotating polish drill rod, and the speed for promoting polish drill rod up and down is 8-
15m/min, boring disk by rotation drilling well horizontally rotates polish drill rod, revolving speed 60-90r/min.
3. a kind of fine sand leak stopping according to claim 1 is starched, annular space is counter to infuse backward extrusion blocking method, it is characterised in that: described
Bridge plug agent is the mixing composite material being made of in any proportion cotton seed hulls, acute end, Pericarppium Armeniacae Amarum, mica sheet, particle size range 20-5
Mesh.
4. a kind of fine sand leak stopping according to claim 1 is starched, annular space is counter to infuse backward extrusion blocking method, it is characterised in that: described
Blanc fixe particle size range 20-200 mesh.
5. a kind of fine sand leak stopping according to claim 1 is starched, annular space is counter to infuse backward extrusion blocking method, it is characterised in that: described
Fine sand be hard yellow ground for building, 2-3 millimeters of granularity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710333423.9A CN107035338B (en) | 2017-05-12 | 2017-05-12 | Annular space is counter infuses backward extrusion blocking method for a kind of fine sand leak stopping slurry |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710333423.9A CN107035338B (en) | 2017-05-12 | 2017-05-12 | Annular space is counter infuses backward extrusion blocking method for a kind of fine sand leak stopping slurry |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107035338A CN107035338A (en) | 2017-08-11 |
| CN107035338B true CN107035338B (en) | 2018-12-28 |
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| CN201710333423.9A Active CN107035338B (en) | 2017-05-12 | 2017-05-12 | Annular space is counter infuses backward extrusion blocking method for a kind of fine sand leak stopping slurry |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NO345560B1 (en) * | 2019-03-13 | 2021-04-19 | European Mud Company As | Composition for making a solids-free drilling fluid a non-invasive drilling fluid |
| US11912928B2 (en) | 2019-03-13 | 2024-02-27 | European Mud Company As | Composition for making a drilling fluid a non-invasive drilling fluid |
| CN115405254A (en) * | 2022-08-09 | 2022-11-29 | 中石化石油工程技术服务有限公司 | Foam cement leakage stopping method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2667351B1 (en) * | 1990-09-27 | 1996-02-23 | Total Petroles | DEVICE FOR PUSHING CASING IN A WELLBORE. |
| CN102877812A (en) * | 2012-09-14 | 2013-01-16 | 中国石油大学(华东) | Method of balancing pressure for well cementation |
| CN202954776U (en) * | 2012-11-23 | 2013-05-29 | 山金城 | Locating sealing device applied to horizontal water injection well layered seal and capable of back flushing and back injecting |
| CN103306637A (en) * | 2013-06-27 | 2013-09-18 | 中国石油集团川庆钻探工程有限公司 | Method for realizing plugging by granulated stone filling and follow-up cementing on packer |
| WO2014062408A1 (en) * | 2012-10-15 | 2014-04-24 | Apache Corporation | Fast-setting cements for well abandonment |
| CN106555565A (en) * | 2016-11-30 | 2017-04-05 | 中石化石油工程技术服务有限公司 | A kind of low pressure and easy leaking loses the cementing method that well positive injection is instead squeezed |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004109053A2 (en) * | 2003-06-04 | 2004-12-16 | Sun Drilling Products Corporation | Lost circulation material blend offering high fluid loss with minimum solids |
-
2017
- 2017-05-12 CN CN201710333423.9A patent/CN107035338B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2667351B1 (en) * | 1990-09-27 | 1996-02-23 | Total Petroles | DEVICE FOR PUSHING CASING IN A WELLBORE. |
| CN102877812A (en) * | 2012-09-14 | 2013-01-16 | 中国石油大学(华东) | Method of balancing pressure for well cementation |
| WO2014062408A1 (en) * | 2012-10-15 | 2014-04-24 | Apache Corporation | Fast-setting cements for well abandonment |
| CN202954776U (en) * | 2012-11-23 | 2013-05-29 | 山金城 | Locating sealing device applied to horizontal water injection well layered seal and capable of back flushing and back injecting |
| CN103306637A (en) * | 2013-06-27 | 2013-09-18 | 中国石油集团川庆钻探工程有限公司 | Method for realizing plugging by granulated stone filling and follow-up cementing on packer |
| CN106555565A (en) * | 2016-11-30 | 2017-04-05 | 中石化石油工程技术服务有限公司 | A kind of low pressure and easy leaking loses the cementing method that well positive injection is instead squeezed |
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| CN107035338A (en) | 2017-08-11 |
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Effective date of registration: 20211018 Address after: 100007 Oil Mansion, 9 North Avenue, Dongcheng District, Beijing, Dongzhimen Patentee after: CHINA NATIONAL PETROLEUM Corp. Patentee after: CHINA NATIONAL PETROLEUM CORPORATION CHUANQING DRILLING ENGINEERING Co. Address before: Room 1902, Changqing building, 151 Weiyang Road, Xi'an, Shaanxi 710018 Patentee before: CNPC CHUANQING DRILLING ENGINEERING CO., LTD. CHANGQING WELL DRILLING GENERAL Co. |