CN113462369B - Oil-based mud cake curing agent and preparation method, use method and application thereof - Google Patents
Oil-based mud cake curing agent and preparation method, use method and application thereof Download PDFInfo
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- AMQJEAYHLZJPGS-UHFFFAOYSA-N N-Pentanol Chemical compound CCCCCO AMQJEAYHLZJPGS-UHFFFAOYSA-N 0.000 claims abstract description 12
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 claims abstract description 12
- ZSIAUFGUXNUGDI-UHFFFAOYSA-N hexan-1-ol Chemical compound CCCCCCO ZSIAUFGUXNUGDI-UHFFFAOYSA-N 0.000 claims abstract description 12
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 claims abstract description 12
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000011259 mixed solution Substances 0.000 claims abstract description 7
- DNIAPMSPPWPWGF-VKHMYHEASA-N (+)-propylene glycol Chemical compound C[C@H](O)CO DNIAPMSPPWPWGF-VKHMYHEASA-N 0.000 claims abstract description 6
- YPFDHNVEDLHUCE-UHFFFAOYSA-N 1,3-propanediol Substances OCCCO YPFDHNVEDLHUCE-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229940035437 1,3-propanediol Drugs 0.000 claims abstract description 6
- BTANRVKWQNVYAZ-UHFFFAOYSA-N butan-2-ol Chemical compound CCC(C)O BTANRVKWQNVYAZ-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229920000166 polytrimethylene carbonate Polymers 0.000 claims abstract description 6
- 229960004063 propylene glycol Drugs 0.000 claims abstract description 6
- 239000002002 slurry Substances 0.000 claims description 14
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 12
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 9
- 229910020489 SiO3 Inorganic materials 0.000 claims description 8
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 6
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 6
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 claims description 6
- 239000002861 polymer material Substances 0.000 claims description 6
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 claims description 3
- 239000007832 Na2SO4 Substances 0.000 claims description 3
- 229910003243 Na2SiO3·9H2O Inorganic materials 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 3
- 238000007334 copolymerization reaction Methods 0.000 claims description 3
- 239000003995 emulsifying agent Substances 0.000 claims description 3
- 239000003999 initiator Substances 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 239000000178 monomer Substances 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 3
- 125000001273 sulfonato group Chemical class [O-]S(*)(=O)=O 0.000 claims description 3
- 238000007711 solidification Methods 0.000 abstract description 11
- 230000008023 solidification Effects 0.000 abstract description 11
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 6
- 239000003345 natural gas Substances 0.000 abstract description 3
- 239000003209 petroleum derivative Substances 0.000 abstract description 3
- 229910052911 sodium silicate Inorganic materials 0.000 abstract 1
- 238000001723 curing Methods 0.000 description 80
- 239000007789 gas Substances 0.000 description 34
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- 230000000694 effects Effects 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 5
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- 230000009286 beneficial effect Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000005465 channeling Effects 0.000 description 3
- 230000015271 coagulation Effects 0.000 description 3
- 238000005345 coagulation Methods 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 3
- 239000003129 oil well Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 230000008719 thickening Effects 0.000 description 3
- 238000004132 cross linking Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000003607 modifier Substances 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 238000000518 rheometry Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000008186 active pharmaceutical agent Substances 0.000 description 1
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 1
- 229910052601 baryte Inorganic materials 0.000 description 1
- 239000010428 baryte Substances 0.000 description 1
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- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
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- 238000011160 research Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000003079 shale oil Substances 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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- 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 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
- E21B33/138—Plastering the borehole wall; Injecting into the formation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The invention belongs to the technical field of petroleum and natural gas engineering, and particularly relates to an oil-based mud cake curing agent, and a preparation method, a use method and application thereof. The oil-based mud cake curing agent is prepared from isopropanol: 1, 2-propylene glycol: n-propanol: n-pentanol: n-hexanol: ethylene glycol: 1, 3-propanediol: secondary butyl alcohol: water (13.0-13.3%): (2.2% -2.7%): (2.1-2.3%): (0.9-1.3%): (12.4% -13.1%): (4.0-4.4%): (11.2% -11.6%): (5.2% -5.8%): (45.5% to 49.0%) of a mixed solution, and Na2SiO3And (4) forming. The scheme realizes the solidification of the well cementation two-interface oil-based mud cake under the conditions of not modifying the oil-based drilling fluid and not changing cement paste, can improve the cementing strength of the well cementation two-interface under the conditions of the oil-based drilling fluid, and solves the problem of solidifying the oil-based mud cake.
Description
Technical Field
The invention belongs to the technical field of petroleum and natural gas engineering, and particularly relates to an oil-based mud cake curing agent, and a preparation method, a use method and application thereof.
Background
At present, the following three methods are known and used for solving the problem of solidification of a cementing two-interface mud cake:
the first is a special MTC (Mud to Cement, i.e. conversion of Mud to Cement paste, if "multifunctional drilling fluid + MTC cementing fluid" is used, it is called drilling and cementing integrated) method. In order to solve the problems of cementing quality and environmental protection of a well cementation secondary interface, the MTC technology based on the water-based drilling fluid appears in the late 80s of the 20 th century, and if drilling and cementing are integrated, the mud cake of the well cementation secondary interface can be solidified, and the cementing strength and the cementing quality of the well cementation secondary interface can be obviously improved. The proposal, research and practice of the method are undoubtedly of great significance for solving the problem of the two interfaces of well cementation, but the problems of brittle fracture, high-temperature performance variation and the like of the MTC solidification body can cause more serious gas channeling due to operations such as perforation and the like, influence the oil and gas exploitation effect and even report the well to be abandoned, and restrict the comprehensive application effect and the field popularization and application of the MTC well cementation technology to a certain extent. Therefore, at present, MTC is mostly used for cementing technical casing pipes or as a filling slurry, and the application of MTC in the cementing of casing pipes has not been agreed by scholars at home and abroad, but the method cannot cure oil-based mud cakes. Nahm and Wyant, issued in 1993 and 1995 in tandem as in U.S. patent 2, proposed a similar method based on oil-based drilling fluids, but the field application reports to date that the applicant is not aware, and neither patent mentions oil-based mudcake curing.
The second method is the MTA (Mud Cake to Agglomerated Cake) method proposed by the applicant and the inventor. In order to realize the solidification of the mud cake on the second interface of the well cementation by the non-MTC method, the applicant provides a scientific conception of MTA, creates a new theory of the well cementation of MTA, innovatively develops two new materials, namely a mud cake modifier and a mud cake forming agent (the invention has the patent number of ZL200810047343.8, the name of the invention is a mud cake forming agent and a preparation method and application thereof, and the inventor is concerned with the military), greatly improves the cementing strength of the second interface of the well cementation, forms a new MTA well cementation technology, is popularized and applied in 5 oil and gas fields, and has an obvious effect. The essential difference between the method and the MTC method is that the former does not change the best well cementing material recognized at home and abroad, namely oil well cement, and realizes the solidification of the well cementing two-interface mud cake. However, the method achieves the aim of not changing oil well cement, namely the drilling fluid still needs to be modified firstly, namely 0.5 to 3 percent (mass percent) of mud cake modifier needs to be added into the drilling fluid firstly, so that the method has limitation when being used for deep wells and is not suitable for mud cake solidification under the condition of oil-based drilling fluid.
The third method is a MCS (Mud Cake Solidification) method proposed by the present applicant and the inventors. In order to realize the solidification of the well cementation two-interface mud cake under the condition that the drilling fluid and the cement slurry are not changed (but can be used for a deep well), the applicant provides a scientific conception of MCS, creates a new theory of MCS well cementation, designs two new materials (the invention patent number is ZL201210345941.X, the name is a mud cake curing agent and a preparation method and application thereof, the inventor is concerned with the army), improves the cementing strength of the well cementation two-interface by 6.29-24.65 times, forms a new technology of MCS well cementation, and has been widely applied to 8 oil and gas exploration areas, and the effect is obvious. The essential difference between the method and the MTA method is that the former method realizes the solidification of the well cementation two-interface mud cake without changing oil well cement or adding materials into drilling fluid. Although the mud cake curing agent is popularized and applied to the well cementation of a plurality of oil and gas exploration areas, the oil-based mud cake cannot be cured by the method.
Disclosure of Invention
The invention aims to provide an oil-based mud cake curing agent, which can be used for curing a well-cementing two-interface oil-based mud cake under the conditions of not modifying an oil-based drilling fluid nor changing cement slurry, so that the cementing strength and packing capacity of the well-cementing two-interface are greatly improved, and the safe and efficient exploitation of petroleum and natural gas is met.
In order to achieve the above object, the present invention provides an oil-based mud cake curing agent, which is prepared from isopropanol: 1, 2-propylene glycol: n-propanol: n-pentanol: n-hexanol: ethylene glycol: 1, 3-propanediol: secondary butyl alcohol: water (13.0-13.3%): (2.2% -2.7%): (2.1% -2.3%): (0.9-1.3%): (12.4-13.1%): (4.0-4.4%): (11.2% -11.6%): (5.2% -5.8%): (45.5% -49.0%) of mixed liquid, and Na accounting for 12% -15% of the mixed liquid2SiO3The components are in percentage by mass.
The preparation method of the oil-based mud cake curing agent comprises the following steps: 1, 2-propylene glycol: n-propanol: n-pentanol: n-hexanol: ethylene glycol: 1, 3-propanediol: secondary butyl alcohol: water (13.0-13.3%): (2.2% -2.7%): (2.1% -2.3%): (0.9-1.3%): (12.4% -13.1%): (4.0-4.4%): (11.2% -11.6%): (5.2% -5.8%): (45.5% -49.0%) to obtain a mixed solution, and adding Na accounting for 12% -15% of the mixed solution2SiO3The oil-based mud cake curing agent is prepared, and the proportion is mass percent.
The use method of the oil-based mud cake curing agent comprises the following steps:
step 1, preparing an oil-based mud cake curing agent;
step 2, preparing a mud cake curing agent, wherein the preparation method of the mud cake curing agent comprises the following steps of: the mass ratio of styrene is (42-60): (58-40), selecting the raw materials according to the weight ratio of 3.0-3.3% of acrylic acid, 1.6-1.8% of composite emulsifier, 2.8-3.2% of methacrylic acid, 0.5-0.8% of unsaturated sulfonate, 0.42-0.46% of molecular weight regulator and 0.55% of initiator which respectively account for the total weight of the monomers, and according to the mass ratio of the sum of the butadiene, the styrene and the acrylic acid to the water being 100: (115-125) selecting water, mixing, carrying out copolymerization reaction for 18-20 h at the temperature of 72-78 ℃ to obtain a liquid polymer material, adding 1.8-2.1 times of water into the liquid polymer material, and continuing to add Na accounting for 35-45% of the added water by mass2SiO3Preparing;
step 3, preparing a coagulated cake forming agent, wherein the coagulated cake forming agent is prepared from 1-3% of NaOH and 0.5-1.5% of Na2SO4And 2% -4% of Na2SiO3·9H2O, and the balance of water, wherein the weight percentage is the above ratio;
and 4, injecting the oil-based mud cake curing agent, the coagulated cake forming agent and the cement slurry into the oil-gas well in sequence.
And in the step 4, the proportion of the oil-based mud cake curing agent, the mud cake curing agent and the coagulated cake forming agent is 1: 1: (1-2).
And in the step 4, the oil-based mud cake curing agent, the mud cake curing agent and the coagulated cake forming agent are sequentially and respectively contacted with the oil-based mud cake, wherein the contact time ratio is 1: 1: (1-2).
And the application of the oil-based mud cake curing agent in curing the oil-based mud cake on the well cementation two-interface.
And the oil-based mud cake curing agent is applied to improving the cementing strength of a well cementation two-interface under the condition of the oil-based drilling fluid.
Compared with the prior art, the technical scheme has the beneficial effects that: the method realizes the solidification of the oil-based mud cake of the well cementation two interfaces under the condition of not modifying the oil-based drilling fluid nor changing cement paste, can greatly improve the cementing strength of the well cementation two interfaces under the condition of the oil-based drilling fluid, and solves the problem that the oil-based mud cake cannot be solidified by an MTC (machine type communication) method, an MTA (maximum temperature coefficient of arrival) method and an MCS (modulation and coding scheme) method, so that the method is favorable for improving the cementing quality and the packing capacity of the well cementation two interfaces under the condition of the oil-based drilling fluid, and lays a solid shaft foundation for preventing the annular pressure of a complex well, particularly a shale gas horizontal well from being pressurized so as to realize safe and efficient exploitation.
Drawings
FIG. 1 is SEM test results of oil-based mud cake curing and interfacial crosslinking performed 3 days after the oil-based mud cake curing agent in example 1.
Detailed Description
The present invention will be described in detail with reference to examples, but the present invention is not limited to the examples.
Oil-based mud cakeThe preparation method of the curing agent comprises the following steps: according to the proportion of isopropanol: 1, 2-propylene glycol: n-propanol: n-pentanol: n-hexanol: ethylene glycol: 1, 3-propanediol: secondary butyl alcohol: water (13.0-13.3%): (2.2% -2.7%): (2.1-2.3%): (0.9-1.3%): (12.4% -13.1%): (4.0-4.4%): (11.2% -11.6%): (5.2% -5.8%): (45.5-49.0 percent) and then adding Na accounting for 12-15 percent of the mass percent of the mixed solution2SiO3And finally, preparing the oil-based mud cake curing agent.
The use method of the oil-based mud cake curing agent comprises the following steps: step 1, preparing an oil-based mud cake curing agent;
step 2, preparing a mud cake curing agent, wherein the preparation method of the mud cake curing agent comprises the following steps of: the mass ratio of styrene is (42-60): (58-40), selecting the raw materials according to the weight ratio of 3.0-3.3% of acrylic acid, 1.6-1.8% of composite emulsifier, 2.8-3.2% of methacrylic acid, 0.5-0.8% of unsaturated sulfonate, 0.42-0.46% of molecular weight regulator and 0.55% of initiator which respectively account for the total weight of the monomers, and according to the mass ratio of the sum of the butadiene, the styrene and the acrylic acid to the water being 100: (115-125) selecting water, mixing, carrying out copolymerization reaction for 18-20 h at the temperature of 72-78 ℃ to obtain a liquid polymer material, adding 1.8-2.1 times of water into the liquid polymer material, and continuing to add Na accounting for 35-45% of the added water by mass2SiO3Preparing;
step 3, preparing a coagulated cake forming agent, wherein the coagulated cake forming agent is prepared from 1-3% of NaOH and 0.5-1.5% of Na2SO4And 2% -4% of Na2SiO3·9H2O, and the balance of water, wherein the weight percentage is the above ratio;
and 4, injecting the oil-based mud cake curing agent, the coagulated cake forming agent and the cement slurry into the oil-gas well in sequence.
When the oil-based mud cake curing agent is used specifically, according to the practical conditions of a well (the geometric dimension of a well hole and the construction displacement of well cementation), the proportion of the oil-based mud cake curing agent, the mud cake curing agent and the coagulated cake forming agent is 1: 1: (1-2), the oil-based mud cake curing agent, the mud cake curing agent and the coagulated cake forming agent are sequentially and respectively contacted with the oil-based mud cake, and the proportion of the contact time is 1: 1: (1-2); the three liquid materials are used as the pad fluid for well cementation of the well, so that the cementing strength of a well cementation two-interface under the condition of the oil-based drilling fluid can be improved. The injection sequence in the implementation is oil-based mud cake curing agent, coagulated cake forming agent and cement paste.
Test well 1:
the experimental conditions of the shale gas sidetracking horizontal well are as follows: the curing method is bath curing, the curing temperature is 105 ℃, the curing pressure is normal pressure (usually 0.1MPa), the thickness of the oil-based mud cake is 0.4-0.5 mm, the contact time of the oil-based mud cake curing agent and the mud cake curing agent with the oil-based mud cake is 80s, the contact time of the coagulation cake forming agent with the oil-based mud cake is 160s, and the contact sequence comprises the oil-based mud cake curing agent, the mud cake curing agent and the coagulation cake forming agent. According to the actually measured temperature and pressure condition of a certain shale gas sidetracking horizontal well, the experimental condition of compatibility with oil-based drilling fluid and cement paste is determined as follows: the temperature is 90 ℃, the pressure is 85MPa, and the temperature rise time is 60 min. The rheological experimental conditions were 90 ℃ x atmospheric pressure. The experimental results are given in the following table:
TABLE 1 cementing two-interface cementing strength test results
As can be seen from Table 1, with the extension of the curing time, the cementing strength of the two interfaces of the shale gas side-drilling horizontal well cementing adopting the oil-based mud cake curing agent is increased and reaches 0.1002-0.3974 MPa, while the cementing strength of the two interfaces of the shale gas side-drilling horizontal well cementing not adopting the oil-based mud cake curing agent is basically 0.0042-0.0082 MPa, namely the cementing strength of the two interfaces of the shale gas side-drilling horizontal well cementing is increased by 19.44-53.43 times compared with that of the two interfaces of the latter well cementing.
In order to investigate the compatibility of the oil-based mud cake curing agent with an oil-based drilling fluid and an elastic-tough gas channeling-preventing cement slurry system for a horizontal well drilled on a shale gas side, a relevant indoor experiment was performed based on the method of API specification 10.
1) Effect of oil-based mud cake curing agent on rheology
As can be seen from Table 2, the rheological properties of the oil-based mud cake curing agent on the oil-based drilling fluid and the elastic and tough gas channeling-preventing cement slurry for the horizontal shale gas side drilling well are not only unaffected, but also the rheological index is increased by 86.42-87.95%, so that the oil-based mud cake curing agent is more beneficial to improving the displacement efficiency of the horizontal section of the shale gas horizontal well.
TABLE 2 Experimental results of oil-based mud cake curing agent on rheology
2) Influence of oil-based mud cake curing agent and thickening time
As can be seen from Table 3, the oil-based mud cake curing agent had no effect on the thickening time of the elastomeric gas channeling-preventing cement slurry for a horizontal well drilled on the gas side of a shale.
TABLE 3 Experimental results of the effect of oil-based mud cake curing agent on thickening time
As can be seen from tables 2 and 3, the oil-based mud cake curing agent has good compatibility with the oil-based drilling fluid and the elastic-toughness gas channeling-preventing cement slurry for the horizontal well drilled on a certain shale gas side, and can completely meet the requirements of well cementation construction. After the oil-based mud cake curing agent is actually used, the cementing quality of a certain shale gas sidetrack horizontal well is effectively improved, and the oil-based mud cake curing agent has excellent gas channeling prevention effect and annular packing capacity, is favorable for improving the cementing integrity of the shale gas horizontal well, and meets the volume fracturing requirement of the shale gas horizontal well.
The results of SEM tests on curing and interfacial crosslinking of the oil-based mud cake after 3 days of curing with the oil-based mud cake curing agent are shown in FIG. 1. As can be seen from the left image of fig. 1, a large amount of fibrous gelled substances are generated between the rock debris and the barite in the oil-based mud cake, and the fibrous gelled substances are like a 'paste' to bind the solid-phase particles together to form a whole, namely, the oil-based mud cake is solidified. As clearly seen from the right picture of figure 1, thin columnar or flaky gelled substances are generated between the solidified oil-based mud cake and two interfaces of the cement column and the simulated earth borehole, the solidified oil-based mud cake and the cement column are mutually wound, and the two interface areas are in transition and smooth, namely the cement column-the solidified oil-based mud cake-the simulated earth borehole interface are crosslinked, so that the cementing strength of the two interfaces of the well cementation is greatly improved.
And 2, testing well:
the experimental conditions are unchanged, the curing mode is unchanged, the oil-based mud cake curing agent (the contact time with the oil-based mud cake is more than or equal to 80s), the mud cake curing agent (the contact time with the oil-based mud cake is more than or equal to 80s) and the coagulation cake forming agent (the contact time with the oil-based mud cake is more than or equal to 80 s-160 s) are adopted, and the pre-liquid of the oil-based mud cake curing agent is used for 2m3So that the oil-based mud cake curing agent is prepared by 2m firstly3Preparing mud cake curing agent 2m3And 2-4 m of cake forming agent3The experimental results are as follows:
table 4 comparison table of cementing strength of two interfaces of front and back cementing well of test well adopting the technical scheme
As can be seen from the table 4, with the extension of the curing time, the cementing strength of the two interfaces of the test well cementing with the oil-based mud cake curing agent is increased and reaches 0.1637-0.3837 MPa, while the cementing strength of the two interfaces of the test well cementing without the oil-based mud cake curing agent is basically 0.0024-0.0055 MPa, and the cementing strength of the two interfaces of the test well cementing is improved by 27.79-71 times compared with the cementing strength of the two interfaces of the latter well cementing.
After the pilot field test conditions of the test wells 1 and 2 are summarized (mainly the use safety of the oil-based mud cake curing agent is inspected), the oil-based mud cake curing agent and the field use method and process thereof are further improved.
The field process technology comprises the following steps: the original well cementing process, the cement slurry system and the oil-based drilling fluid system are not changed, and only need to be as follows:
1) by means of oilBase mud cake curing agent 2m3The pre-pad fluid is used (the specific dosage can be adjusted according to the actual thickness of the oil-based mud cake) (the contact time between the pre-pad fluid and the well wall oil-based mud cake is ensured to be more than 80 s).
2) Adopting 2m mud cake curing agent3The pre-pad fluid is used (the specific dosage can be adjusted according to the actual thickness of the oil-based mud cake) (the contact time between the pre-pad fluid and the well wall oil-based mud cake is ensured to be more than 80 s).
3) Using a coagulated cake forming agent of 4m3The pre-pad fluid (the specific dosage can be adjusted according to the actual thickness of the oil-based mud cake) (the contact time between the pre-pad fluid and the well wall oil-based mud cake is ensured to be more than 160 s).
4) Well cementation construction sequence: -oil-based drilling fluid-active front-arranged various fluids-
Oil-based mud cake curing agent
Mud cake curing agent
Cake forming agent
Designed density cement slurry (including low density cement slurry or high density cement slurry)
┉
The field test is successively carried out in the well completion and well cementation of four shale gas sidetracking horizontal wells in Chongqing city and Guizhou province, and the effect is shown in a table 5: the cementing quality qualification rate of the first and second interfaces of the well cementation is 100 percent, and the excellent rate is 100 percent. The volume fracturing test of the No. 1 sidetrack horizontal well is completed at present, the shale gas yield is 7.5013 ten thousand square/day, the shale oil yield is 9.87 square/day, the phenomena of pressure are not generated before and after annular fracturing between an oil layer casing pipe and a surface layer casing pipe, the volume fracturing test of other 3 wells is performed, and the phenomena of pressure are not generated at present. The field test results show that: 1) the oil-based mud cake curing agent can effectively improve the cementing quality of the shale gas horizontal well, and the field construction process is simple, safe and reliable; 2) the oil-based mud cake curing agent has excellent gas channeling prevention effect and annular packing capacity, is beneficial to improving the well cementation integrity of the shale gas horizontal well, and meets the volume fracturing requirement of the shale gas horizontal well.
TABLE 5 shale gas sidetracking horizontal well oil-based mud cake curing agent field test conditions
The beneficial effects of this technical scheme lie in: the method realizes the solidification of the oil-based mud cake of the well cementation two interfaces under the conditions of not modifying the oil-based drilling fluid and not changing cement paste, can greatly improve the cementing strength of the well cementation two interfaces under the condition of the oil-based drilling fluid, and solves the problem that the oil-based mud cake cannot be solidified by the MTC method, the MTA method and the MCS method in the prior art, so the method is favorable for improving the cementing quality and the packing capacity of the well cementation two interfaces under the condition of the oil-based drilling fluid, and lays a solid shaft foundation for preventing the annular pressure of a complex well, particularly a shale gas horizontal well, from being pressurized so as to realize safe and efficient exploitation.
Claims (7)
1. The oil-based mud cake curing agent is characterized in that: the method comprises the following steps of (1) preparing isopropanol: 1, 2-propylene glycol: n-propanol: n-pentanol: n-hexanol: ethylene glycol: 1, 3-propanediol: secondary butyl alcohol: water (13.0-13.3%): (2.2% -2.7%): (2.1% -2.3%): (0.9-1.3%): (12.4% -13.1%): (4.0-4.4%): (11.2% -11.6%): (5.2% -5.8%): (45.5% -49.0%) of a mixed solution, and Na accounting for 12% -15% of the mixed solution2SiO3The components are in percentage by mass.
2. The preparation method of the oil-based mud cake curing agent is characterized in that: firstly, isopropanol: 1, 2-propylene glycol: n-propanol: n-pentanol: n-hexanol: ethylene glycol: 1, 3-propanediol: secondary butyl alcohol: water (13.0-13.3%): (2.2% -2.7%): (2.1% -2.3%): (0.9-1.3%): (12.4% -13.1%): (4.0-4.4%): (11.2% -11.6%): (5.2% -5.8%): (45.5-49.0%) and then adding Na accounting for 12-15% of the mixed solution2SiO3The oil-based mud cake curing agent is prepared, and the proportion is mass percent.
3. The use method of the oil-based mud cake curing agent according to claim 1 or 2, characterized by comprising the steps of:
step 1, preparing an oil-based mud cake curing agent;
step 2, preparing a mud cake curing agent, wherein the preparation method of the mud cake curing agent comprises the following steps of: the mass ratio of styrene is (42-60): (58-40), selecting the raw materials according to the weight ratio of 3.0-3.3% of acrylic acid, 1.6-1.8% of composite emulsifier, 2.8-3.2% of methacrylic acid, 0.5-0.8% of unsaturated sulfonate, 0.42-0.46% of molecular weight regulator and 0.55% of initiator which respectively account for the total weight of the monomers, and according to the mass ratio of the sum of the butadiene, the styrene and the acrylic acid to the water being 100: (115-125) selecting water, mixing, carrying out copolymerization reaction for 18-20 h at the temperature of 72-78 ℃ to obtain a liquid polymer material, adding 1.8-2.1 times of water into the liquid polymer material, and continuing to add Na accounting for 35-45% of the added water by mass2SiO3The preparation is carried out;
step 3, preparing a coagulated cake forming agent, wherein the coagulated cake forming agent is prepared from 1-3% of NaOH and 0.5-1.5% of Na2SO4And 2% -4% of Na2SiO3·9H2O, and the balance of water, wherein the weight percentage is the above ratio;
and 4, injecting the oil-based mud cake curing agent, the coagulated cake forming agent and the cement slurry into the oil-gas well in sequence.
4. The use method of the oil-based mud cake curing agent according to claim 3, wherein: in the step 4, the proportion of the oil-based mud cake curing agent, the mud cake curing agent and the coagulated cake forming agent is 1: 1: (1-2).
5. The use method of the oil-based mud cake curing agent according to claim 3, wherein: and 4, sequentially and respectively contacting the oil-based mud cake curing agent, the mud cake curing agent and the coagulated cake forming agent with the oil-based mud cake, wherein the contact time ratio is 1: 1: (1-2).
6. Use of the oil-based mud cake curing agent according to claim 1 or 2 for cementing a two-interface oil-based mud cake.
7. Use of the oil-based mud cake curing agent of claim 1 or 2 to improve the cementing strength of a well-cementing interface under oil-based drilling fluid conditions.
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