CN108456510B - Composite pressure-bearing leakage-stopping slurry, preparation method and construction method - Google Patents
Composite pressure-bearing leakage-stopping slurry, preparation method and construction method Download PDFInfo
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- CN108456510B CN108456510B CN201710089946.3A CN201710089946A CN108456510B CN 108456510 B CN108456510 B CN 108456510B CN 201710089946 A CN201710089946 A CN 201710089946A CN 108456510 B CN108456510 B CN 108456510B
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- 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
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- 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
- C09K8/46—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
Abstract
The invention discloses composite pressure-bearing leakage-stopping slurry and a construction method thereof. The leaking stoppage slurry comprises: bridging slurry and consolidation slurry; the consolidation slurry is cement slurry or chemical consolidation slurry. The construction method comprises the following steps: and (3) putting a smooth drill rod to the bottom of the weak layer, pumping bridge plugging slurry, covering the weak layer and the upper 100m well section, pulling the well to 100m above the weak stratum, injecting consolidation slurry, pulling the well to 100m above the surface of the consolidation slurry, closing the well, slowly pressurizing the well mouth, stopping more than two thirds of the consolidation slurry into the stratum, waiting for 24 hours for setting, opening the well, replacing a drilling tool to sweep the plug, testing the pressure, and continuing drilling if the well is qualified. The invention lies in the course of using bridge plugging and consolidation slurry compositely, bridge plugging slurry plays a role in supporting open weak stratum, plugging partial leakage passage and facilitating retention of consolidation slurry for follow-up, retention, thickening and consolidation in the leakage passage after consolidation slurry follow-up form permanent plugging layer, bearing effect is good durability, no re-leakage occurs in later drilling construction, and normal operation of drilling construction is guaranteed.
Description
Technical Field
The invention relates to the technical field of drilling, in particular to composite pressure-bearing leakage-stopping slurry, a preparation method and a construction method.
Background
In the process of petroleum drilling, due to the limitation of a well body structure, stratums with different pressure coefficients are in the same open hole section, and in order to avoid the leakage of a low-pressure stratum, the stratum needs to be subjected to pressure bearing and leaking stoppage, so that the pressure bearing capacity is improved, and the safe operation of drilling construction is ensured. In the process of pressure-bearing plugging, a bridging method or a cement consolidation method is usually adopted to hold bridging slurry or cement and the like into the stratum, so that the pressure-bearing capacity of the stratum is improved. When the bridge slurry method is used for bearing pressure, the granular material in the bridge plugging slurry cannot have common temperature resistance, can be carbonized at high temperature, has reduced strength and influences the pressure bearing effect, has poor anti-reverse discharge performance, can be reversely discharged to a shaft under the influence of the exciting pressure of the shaft, causes the result of poor pressure bearing effect, and is easy to generate re-leakage in the later drilling process; when the cement consolidation slurry bears pressure, because the slurry has good fluidity, the slurry is not easy to be retained in a leakage channel, and the ideal pressure bearing effect is difficult to achieve.
In the prior art, the pressure-bearing plugging operation is usually carried out by respectively and independently utilizing bridge plugging slurry or consolidation slurry; when the bridging slurry and the consolidation slurry are used in a combined way, the bridging slurry only plays a role in isolation and protection, prevents the consolidation slurry from being polluted by well slurry, and is difficult to have a good plugging effect.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides composite pressure-bearing leakage-stopping slurry, a preparation method and a construction method. The invention lies in the course of using bridge plugging and consolidation slurry compositely, bridge plugging slurry plays a role in supporting open weak stratum, plugging partial leakage passage and facilitating retention of consolidation slurry for follow-up, retention, thickening and consolidation in the leakage passage after consolidation slurry follow-up form permanent plugging layer, bearing effect is good durability, no re-leakage occurs in later drilling construction, and normal operation of drilling construction is guaranteed.
The invention aims to provide composite pressure-bearing leakage-stopping slurry.
The method comprises the following steps:
bridging slurry and consolidation slurry;
the bridge plugging slurry comprises the following components in parts by weight:
the bridging slurry is prepared by the following steps:
the components are mixed according to the dosage to prepare the bridging slurry.
The consolidation slurry is cement slurry or chemical consolidation slurry.
Among them, preferred are:
the particle size range of the coarse walnut shells is 2-4 mm;
the particle size range of the middle walnut shell is 1-2 mm;
the particle size of the fine walnut shell is less than 1 mm;
the particle size range of the superfine calcium carbonate is 200-800 meshes;
the length of the asbestos wool is 1-5 mm.
The cement slurry is prepared from oil well cement and has a density of 1.75-1.90g/cm3The slurry of (a); more preferably, the density is 1.80 to 1.90g/cm3(ii) a The thickening time is adjusted according to the setting depth of the smooth drill rod and the temperature of a weak stratum, so that thickening is avoided before the squeezing operation is finished. Oil well cements are commercially available.
The chemical consolidation slurry is prepared by a chemical consolidation plugging material HD L-1, and the density of the chemical consolidation plugging material is 1.20-1.75g/cm3More preferably a density of 1.40 to 1.70g/cm3The thickening time is adjusted according to the setting depth of the smooth drill rod and the temperature of a weak stratum, so that thickening is avoided before the squeezing operation is finished, and the chemical solid plugging material HD L-1 is commercially available.
The second purpose of the invention is to provide a construction method of the composite pressure-bearing leakage-stopping slurry.
The method comprises the following steps:
and (3) putting a smooth drill rod to the bottom of the weak layer, pumping bridge plugging slurry, covering the weak layer and the upper 100m well section, pulling the well to 100m above the weak stratum, injecting consolidation slurry, pulling the well to 100m above the surface of the consolidation slurry, closing the well, slowly pressurizing the well mouth, stopping more than two thirds of the consolidation slurry into the stratum, waiting for 24 hours for setting, opening the well, replacing a drilling tool to sweep the plug, testing the pressure, and continuing drilling if the well is qualified.
The construction method is different from the prior construction method, during the plugging construction in the prior art, after the bridge plugging slurry is injected, a drilling tool is not moved (the drilling tool is not taken out), the consolidation slurry is directly pumped in, so that the consolidation slurry is below and above, the consolidation slurry enters the leaking layer during the squeezing, the bridge plugging slurry does not enter the leaking layer, and the bridging slurry cannot play a role in retardation because no particle material exists in the consolidation slurry, so that the retention is not facilitated; the plugging construction method of the invention is characterized in that after the bridge plugging slurry is injected, the drilling is carried out to the upper side of the bridge plugging slurry, then the consolidation slurry is injected, so that the bridge plugging slurry is arranged below and on the upper side of the consolidation slurry, and when the extrusion is suppressed, the bridge plugging slurry firstly enters the leaking layer to play a role in supporting and opening the weak stratum and plugging part of the leaking passage, thereby being beneficial to the retention of the follow-up consolidation slurry.
The invention improves the pressure bearing capacity of the stratum by using a method of matching the bridging slurry and the consolidation slurry. Firstly, injecting bridge plugging slurry to open the low-pressure formation cracks and preliminarily improve the pressure bearing capacity of the formation; and then injecting consolidation slurry to push the bridge plugging slurry injected firstly to move to the deep part of the stratum, so that the pressure bearing capacity of the stratum is further improved, and the consolidation slurry with good fluidity is retained near a well bore under the blockage of the bridge plugging slurry, so that the pressure bearing capacity of the stratum is permanently improved.
The construction method is characterized in that the bridge plugging slurry is firstly suppressed into a weak stratum to support and form a crack, and then the follow-up consolidation slurry is retained in the crack, thickened and consolidated to form a permanent plugging layer. Specifically, the bridging slurry firstly enters a weak stratum (a stratum with a low pressure coefficient) and supports a leakage passage, the follow-up consolidation slurry enters the supported leakage passage, and the bridge plugging slurry which enters firstly blocks part of the leakage passage, so that the follow-up consolidation slurry is retained, and then thickening and consolidation are carried out to form the long-acting plugging layer. Therefore, the bearing effect is good in durability, the drilling construction in the later period cannot be leaked again, and the normal operation of the drilling construction is ensured.
Detailed Description
The present invention will be further described with reference to the following examples.
The following components are in parts by weight, the chemical consolidation slurry is produced by China petrochemical engineering technical research institute, and the sources of the rest components are all sold in the market. Well slurries are water-based drilling fluids used in field drilling processes.
Example 1:
① slurry for bridge plugging
Well slurry: 100
Medium walnut shells (1-2 mm): 2
Fine walnut shells (less than 1 mm): 4
Ultrafine calcium carbonate QS-2(400 mesh): 3
Shielding temporary plugging agent: 5
Asbestos wool (1-2 mm): 1
Saw dust: 0.5
② consolidation slurry
Cement paste, density 1.85g/cm3Thickening time is 3h, and 24h strength is more than 7MPa
③ Process of construction
And (3) putting a smooth drilling rod to the bottom of the well, pumping bridge plugging slurry to cover the weak layer and the upper 100m well section, pulling the well to 100m above the weak stratum, injecting cement slurry, pulling the well to 100m above the liquid level of the cement slurry, closing the well, slowly pressurizing the well mouth, stopping more than two thirds of the cement slurry into the stratum, waiting for 24 hours for setting, opening the well, replacing a drilling tool to clean the well, testing the pressure, and continuing drilling if the pressure is qualified.
Example 2:
① slurry for bridge plugging
Well slurry: 100
Crude walnut shell (2-4 mm): 2
Medium walnut shells (1-2 mm): 4
Fine walnut shells (less than 1 mm): 5
Ultrafine calcium carbonate QS-2: 6
Shielding temporary plugging agent: 4
Asbestos wool (2-3 mm): 1.5
Saw dust: 0.5
② consolidation slurry
Chemical consolidation slurry with density of 1.45g/cm3Thickening time is 4h, and 24h strength is more than 12MPa
③ Process of construction
And (3) putting a smooth drill rod to the bottom of the well, pumping bridging slurry to cover the weak layer and the upper 100m well section, pulling the well to reach 100m above the weak stratum, injecting chemical consolidation slurry, pulling the well to reach 100m above the surface of the chemical consolidation slurry, closing the well, slowly pressurizing the well mouth, stopping more than two thirds of the chemical consolidation slurry into the stratum, waiting for 24 hours for setting, opening the well, replacing a drilling tool for cleaning, testing the pressure, and continuing drilling if the pressure is qualified.
Example 3:
① slurry for bridge plugging
Well slurry: 100
Crude walnut shell (2-4 mm): 3
Medium walnut shells (1-2 mm): 5
Fine walnut shells (less than 1 mm): 7
Ultrafine calcium carbonate QS-2: 8
Shielding temporary plugging agent: 2
Asbestos wool (1-2 mm): 0.5
Saw dust: 0.5
② consolidation slurry
Chemical consolidation slurry with density of 1.65g/cm3Thickening time is 4h, and 24h strength is more than 15MPa
③ Process of construction
And (3) putting a smooth drill rod to the bottom of the well, pumping bridging slurry to cover the weak layer and the upper 100m well section, pulling the well to reach 100m above the weak stratum, injecting chemical consolidation slurry, pulling the well to reach 100m above the surface of the chemical consolidation slurry, closing the well, slowly pressurizing the well mouth, stopping more than two thirds of the chemical consolidation slurry into the stratum, waiting for 24 hours for setting, opening the well, replacing a drilling tool for cleaning, testing the pressure, and continuing drilling if the pressure is qualified.
Example 4:
the diameter of a second open hole of a certain well is 320mm, after loss occurs at the well depth of 1340.00-1610.00 m in the drilling process, the bridge plugging slurry is used for carrying out pressure bearing operation on the well section, and the stratum pressure bearing capacity is 1.37g/cm from equivalent density3Increasing the equivalent density to 1.65g/cm3And continuing to drill to 2500m, and then the well section is lost again, and the analysis shows that the secondary loss is caused by the loss of the function of the bridging slurry, the pressure is carried out by utilizing a composite pressure-bearing mode of the bridging slurry and the chemical consolidation slurry, and after pressure-bearing construction, the stratum pressure-bearing capacity reaches the equivalent density of 1.70g/cm3And no leakage occurs in the subsequent drilling process, and the construction of the two-way drilling well is smoothly completed.
The formula and the construction process in the process of composite pressure-bearing plugging of the bridge plugging slurry and the chemical consolidation slurry are as follows:
① slurry for bridge plugging
Well slurry: 100
Crude walnut shell (2-4 mm): 2
Medium walnut shells (1-2 mm): 4
Fine walnut shells (less than 1 mm): 6
Ultrafine calcium carbonate QS-2: 5
Shielding temporary plugging agent: 3
Asbestos wool (1-2 mm): 2
Saw dust: 1
② consolidation slurry
Chemical consolidation slurry with density of 1.45g/cm3Thickening time is 4h30min, and 24h strength is more than 10MPa
③ Process of construction
A smooth drill rod is put to 1610m, and bridging slurry is pumped in for 30m3Pulling out the drill bit to 1240m, pumping in chemical consolidation slurry 34m3Pulling out the drill bit to 700m, closing the well, slowly pressurizing the well mouth, and pulling 25m3After the chemical consolidation slurry is held back into the stratum, waiting for setting for 24 hours, opening the well, changing the drilling tool to sweep the plug, testing the pressure, and enabling the pressure bearing capacity of the well bottom to reach the equivalent density of 1.70g/cm3And continuing to drill.
Claims (6)
1. The composite pressure-bearing leaking stoppage slurry is characterized by comprising the following components:
bridging slurry and consolidation slurry;
the bridge plugging slurry comprises the following components in parts by weight:
the consolidation slurry is cement slurry or chemical consolidation slurry;
the cement slurry is prepared from oil well cement and has a density of 1.75-1.90g/cm3The slurry of (a);
the chemical consolidation slurry isThe density of the plugging material HD L-1 prepared by chemical consolidation is 1.20-1.75g/cm3The slurry of (a);
the particle size range of the coarse walnut shells is 2-4 mm;
the particle size range of the middle walnut shell is 1-2 mm;
the particle size of the fine walnut shell is less than 1 mm;
the particle size range of the superfine calcium carbonate is 200-800 meshes;
the leakage blocking slurry is constructed according to the following method:
1) a smooth drilling rod is put to the bottom of the weak layer, bridging slurry is pumped in, the amount of the bridging slurry is controlled, the bridging slurry covers the whole weak layer and the upper 100m well section, the drilling is started to reach 100m above the weak stratum, and consolidation slurry is injected;
2) drilling until the depth is 100m above the surface of the consolidation slurry, closing the well, slowly pressurizing the well mouth, and after more than two thirds of the consolidation slurry is held in the stratum, waiting for setting for 24 hours;
3) and (4) opening the well, testing the pressure after the drilling tool is replaced and the plug is removed, and continuing drilling if the pressure is qualified.
2. The composite pressure-bearing leakage-stopping slurry as claimed in claim 1, wherein:
the length of the asbestos wool is 1-5 mm.
3. The composite pressure-bearing leakage-stopping slurry as claimed in claim 1, wherein:
4. the composite pressure-bearing leakage-stopping slurry as claimed in claim 1, wherein:
the cement slurry is prepared from oil well cement and has a density of 1.80-1.90g/cm3The slurry of (a);
the chemical consolidation slurry is prepared by using a chemical consolidation plugging material HD L-1, and the density of the chemical consolidation plugging material is 1.40-1.70g/cm3The slurry of (1).
5. The composite pressure-bearing leakage-stopping slurry as claimed in any one of claims 1 to 4, wherein:
the bridging slurry is prepared by the following steps:
the components are mixed according to the dosage to prepare the bridging slurry.
6. A construction method of the composite pressure-bearing leakage-stopping slurry as claimed in any one of claims 1 to 5, characterized in that the method comprises:
1) a smooth drilling rod is put to the bottom of the weak layer, bridging slurry is pumped in, the amount of the bridging slurry is controlled, the bridging slurry covers the whole weak layer and the upper 100m well section, the drilling is started to reach 100m above the weak stratum, and consolidation slurry is injected;
2) drilling until the depth is 100m above the surface of the consolidation slurry, closing the well, slowly pressurizing the well mouth, and after more than two thirds of the consolidation slurry is held in the stratum, waiting for setting for 24 hours;
3) and (4) opening the well, testing the pressure after the drilling tool is replaced and the plug is removed, and continuing drilling if the pressure is qualified.
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| CN108456510B true CN108456510B (en) | 2020-07-24 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109538158A (en) * | 2018-10-31 | 2019-03-29 | 中国石油集团川庆钻探工程有限公司 | The method for improving cement slurry blocking construction success rate |
| CN109488249A (en) * | 2018-10-31 | 2019-03-19 | 中国石油集团川庆钻探工程有限公司 | Prevent leak-stopping cement mortar by stratum or the diluted method of wellbore fluids |
| CN111764866B (en) * | 2020-06-08 | 2022-07-26 | 中海石油(中国)有限公司深圳分公司 | Leaking stoppage method for leakage stratum |
| CN112031703B (en) * | 2020-09-03 | 2022-07-15 | 中石化石油工程技术服务有限公司 | Comprehensive leaking stoppage method for cavern type leakage |
| CN112253042A (en) * | 2020-10-28 | 2021-01-22 | 北京中海沃邦能源投资有限公司 | Leakage stopping method |
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|---|---|---|---|---|
| CN1432620A (en) * | 2002-01-14 | 2003-07-30 | 中国石油化工股份有限公司 | Temporary leakage-stopping agent for well drilling shielding and its application |
| CN102434124A (en) * | 2010-09-29 | 2012-05-02 | 中国石油化工股份有限公司 | Successive-compounding-process based plugging method for well drilling |
| CN102977866A (en) * | 2012-12-21 | 2013-03-20 | 中国海洋石油总公司 | High-water-loss curing plugging agent for plugging fissures |
| CN103087687A (en) * | 2011-10-28 | 2013-05-08 | 中国石油化工股份有限公司 | Anti-backflow leak-stopping agent, preparation method and applications thereof |
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- 2017-02-20 CN CN201710089946.3A patent/CN108456510B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1432620A (en) * | 2002-01-14 | 2003-07-30 | 中国石油化工股份有限公司 | Temporary leakage-stopping agent for well drilling shielding and its application |
| CN102434124A (en) * | 2010-09-29 | 2012-05-02 | 中国石油化工股份有限公司 | Successive-compounding-process based plugging method for well drilling |
| CN103087687A (en) * | 2011-10-28 | 2013-05-08 | 中国石油化工股份有限公司 | Anti-backflow leak-stopping agent, preparation method and applications thereof |
| CN102977866A (en) * | 2012-12-21 | 2013-03-20 | 中国海洋石油总公司 | High-water-loss curing plugging agent for plugging fissures |
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