CN116656327A - Low-density full oil-based well workover fluid and preparation method and application thereof - Google Patents
Low-density full oil-based well workover fluid and preparation method and application thereof Download PDFInfo
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- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 21
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- 239000003077 lignite Substances 0.000 claims description 3
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid group Chemical group C(CCCCCCC\C=C/CCCCCCCC)(=O)O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 claims description 3
- 239000011734 sodium Substances 0.000 claims description 3
- 229910052708 sodium Inorganic materials 0.000 claims description 3
- 229940074404 sodium succinate Drugs 0.000 claims description 3
- ZDQYSKICYIVCPN-UHFFFAOYSA-L sodium succinate (anhydrous) Chemical compound [Na+].[Na+].[O-]C(=O)CCC([O-])=O ZDQYSKICYIVCPN-UHFFFAOYSA-L 0.000 claims description 3
- 125000001273 sulfonato group Chemical group [O-]S(*)(=O)=O 0.000 claims description 3
- 239000002736 nonionic surfactant Substances 0.000 claims 1
- 239000007788 liquid Substances 0.000 abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 14
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- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 238000004062 sedimentation Methods 0.000 abstract description 9
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- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 description 5
- 235000013539 calcium stearate Nutrition 0.000 description 5
- 239000008116 calcium stearate Substances 0.000 description 5
- DDXLVDQZPFLQMZ-UHFFFAOYSA-M dodecyl(trimethyl)azanium;chloride Chemical compound [Cl-].CCCCCCCCCCCC[N+](C)(C)C DDXLVDQZPFLQMZ-UHFFFAOYSA-M 0.000 description 5
- 238000005086 pumping Methods 0.000 description 5
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- 238000005520 cutting process Methods 0.000 description 3
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- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 description 2
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 description 2
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 description 2
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- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 description 2
- 239000005642 Oleic acid Substances 0.000 description 2
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- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 description 2
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- GGQQNYXPYWCUHG-RMTFUQJTSA-N (3e,6e)-deca-3,6-diene Chemical compound CCC\C=C\C\C=C\CC GGQQNYXPYWCUHG-RMTFUQJTSA-N 0.000 description 1
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 150000001241 acetals Chemical class 0.000 description 1
- 150000004996 alkyl benzenes Chemical class 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
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- 238000011056 performance test Methods 0.000 description 1
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Classifications
-
- 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
-
- 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
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/502—Oil-based compositions
-
- 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
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
Abstract
The invention relates to a low-density full oil-based well workover fluid, and a preparation method and application thereof. The low-density full oil-based workover fluid comprises the following components in percentage by weight and volume: base oil: 100 parts; organic soil: 3.0-6.0 parts; calcium oxide: 2.0-4.0 parts; emulsifying agent: 1.2-3.2 parts; wetting agent: 1.5-3.0 parts; tackifier: 1.0-2.0 parts; filtrate reducer: 2.0-4.0 parts; high strength reducing agent: 0-40 parts. The density of the well repairing liquid system can reach 0.6g/cm at the minimum 3 The filtrate can be effectively prevented from invading into the production layer to pollute the production layer, and meanwhile, the system is zero free water, so that the hydration of the high water sensitivity shale can be prevented from blocking holes, and the original strength of the stratum can be maintained; has good emulsion stability and sedimentation stability at high temperature, good stability after being kept at 180 ℃ for 15 days, no solid phase precipitation, and can meet the requirement of high temperatureWen Xiujing.
Description
Technical Field
The invention belongs to the technical field of oil and gas field exploitation, and particularly relates to a low-density full oil-based well workover fluid and a preparation method and application thereof.
Background
With the continuous development of old blocks of oil fields for many years, the formation pressure drop is serious due to the overlong exploitation time, so that the formation pressure coefficient of a production layer is generally below 0.90, and is reduced to be even below 0.70, and the density of the conventional water-based slurry is higher than 1.0g/cm at present 3 Conventional oil-based mud densities above 0.95g/cm 3 Well leakage and production layer pollution are easy to occur in well repairing construction, so that non-production time efficiency is increased, reservoir protection is not facilitated, underground accidents are frequent, and oil-gas field development efficiency is seriously affected. Thus, in order to prevent lost circulation and protect hydrocarbon reservoirs, a workover fluid is highly desirable to control the density to 0.90g/cm 3 Below, even lower requirements are required.
At present, foam workover fluid or drilling mud systems are commonly adopted in old well workover fluid systems of oil fields at home and abroad. If the foam well repairing liquid is used for well repairing operation, as the foam well repairing liquid is generally water, if the target layer of the old area block of the oil field has strong water sensitivity lithology, the water phase easily causes mudstone to hydrate, expand and block pore throats, meanwhile, the foam well repairing liquid is not circulated for a long time for 10-15 days, which is required by well repairing construction, the performance of the foam well repairing liquid system is unstable, foam is easy to break or gather, the density of different depths in the well is caused, the gap is increased, and well leakage or well control risk is induced; in addition, if the oil field is repaired by adopting a new fireflood process or the well itself is high in temperature, the unstable state of the foam drilling fluid is aggravated by the high temperature. If the drilling mud system is used directly for well repair, the density is difficult to control to 1.0g/cm due to the high content of poor solid phase 3 In addition, well leakage and reservoir pollution are easy to occur in well repairing construction, meanwhile, when the well is repaired, the well is under a static working condition, and is still subjected to long-time high temperature for 10-15 days, so that the problems of high Wen Poru (oil-based mud), high-temperature degradation of treating agents, solid phase precipitation and the like exist, and the well repairing operation requirements cannot be completely met.
Disclosure of Invention
Accordingly, the present invention is directed to a low-density oil-based workover fluid, and a preparation method and application thereof, and aims to solve the technical problem of making the density of the workover fluid system as low as 0.7g/cm 3 The filtrate can be effectively prevented from invading into the production layer to pollute the production layer, and meanwhile, the system is zero free water, so that the hydration of the high water sensitivity shale can be prevented from blocking holes, and the original strength of the stratum can be maintained; has good emulsion stability and sedimentation stability at high temperature, has good stability after being kept at 180 ℃ for 15 days, does not precipitate solid phase, and can meet the high Wen Xiujing operation requirement.
The aim and the technical problems of the invention are realized by adopting the following technical proposal. The invention provides a low-density full oil-based well workover fluid, which comprises the following components in percentage by weight and volume:
base oil: 100 parts;
organic soil: 3.0-6.0 parts;
calcium oxide: 2.0-4.0 parts;
emulsifying agent: 1.2-3.2 parts;
wetting agent: 1.5-3.0 parts;
tackifier: 1.0-2.0 parts;
filtrate reducer: 2.0-4.0 parts;
high strength reducing agent: 0-40 parts.
The aim and the technical problems of the invention can be further realized by adopting the following technical measures.
Preferably, the low-density whole oil-based workover fluid is a lipophilic clay formed by treating bentonite with a quaternary ammonium salt surfactant.
Preferably, the low-density whole oil-based well workover fluid comprises the following components in percentage by weight: and (0.5-1.0) an emulsifier A and an emulsifier B.
Preferably, the low-density whole oil-based workover fluid is one as described above, wherein the emulsifier a is oleic acid; the emulsifier B is sulfonate.
Preferably, the low-density whole oil-based workover fluid is one of the foregoing, wherein the emulsifier A is cis-octadecene-9-oic acid or octadecenoic acid; the emulsifier B is at least one selected from petroleum ferric sulfonate, alkyl aryl sodium sulfonate and alkyl sodium succinate sulfonate.
Preferably, the low-density whole oil-based workover fluid is selected from at least one of organic lignite and asphalt oxide.
Preferably, the low-density whole oil-based workover fluid is one of the above, wherein the high-strength reducer is glass beads: density of 0.44g/cm 3 The grain diameter is more than or equal to 90 mu m, D50 is more than or equal to 60 mu m, and the compressive strength is higher than or equal to 60 mu m>8000psi(55.16MPa)。
Preferably, the low-density whole oil-based workover fluid is one of the foregoing, wherein the base oil is selected from one of 0# diesel oil, 3# white oil, 5# white oil and synthetic base oil.
The aim of the invention and the technical problems are also achieved by adopting the following technical proposal. The preparation method of the low-density full oil-based well workover fluid provided by the invention comprises the following steps in sequence:
1) Adding the organic soil into the base oil according to the proportion under the condition of high-speed stirring, and stirring for 5-10min to fully and uniformly stir the base oil;
2) Adding calcium oxide, an emulsifying agent, a wetting agent, a filtrate reducer and a tackifier into the base slurry obtained in the step 1) in proportion, and respectively stirring at a high speed for 5-10min to dissolve or disperse uniformly;
3) Adding a high-strength reducer into the glue solution obtained in the step 2) according to a proportion, and stirring at a high speed for 10-20min to enable the density to reach a construction requirement value;
4) Stirring the semi-finished product of the workover fluid obtained in the step 3) at a high speed for 2-3h to enable the semi-finished product to be fully sheared, and obtaining the low-density full oil-based workover fluid.
The aim and the technical problems of the invention can be further realized by adopting the following technical measures.
Preferably, in the foregoing method for preparing a low-density whole oil-based workover fluid, in step 2), calcium oxide, an emulsifying agent, a wetting agent, a filtrate reducer and a tackifier are sequentially added into the base slurry, and are all the next components after the components are dissolved or uniformly dispersed.
Preferably, in the foregoing method for preparing a low-density whole oil-based workover fluid, in steps 1) to 4), the speed of high-speed stirring is 10000-11000 r/min.
The aim of the invention and the technical problems are also achieved by adopting the following technical proposal. The invention provides an application of low-density full oil-based workover fluid in workover construction.
By means of the technical scheme, the low-density full oil-based well workover fluid provided by the invention and the preparation method and application thereof have at least the following advantages:
the low-density full oil-based workover fluid provided by the invention is used for workover operation of oil and gas wells;
the low-density whole oil-based well workover fluid provided by the invention has the temperature resistance reaching 180 ℃ and the density range of 0.60g/cm 3 ～0.9g/cm 3 Standing for 15 days at the constant temperature of 180 ℃, wherein ES is more than 600V, and the well repairing liquid has good emulsion stability, sedimentation stability and rheological property; the special material for the low-density full-oil-based drilling and completion fluid is used as a basic raw material, and the high-strength high-compression-density reducing agent is added, so that the system is easy to prepare on site.
The low-density full oil-based well workover fluid system provided by the invention has stable performance, high demulsification voltage, high-strength density reducer, and stable system performance, and is static at constant temperature for more than 15 days.
The low-density full oil-based workover fluid system provided by the invention has excellent reservoir protection performance, and the recovery value of the core permeability after the workover fluid is polluted is more than 91%; the density can reach 0.6g/cm at the minimum 3 The method can effectively prevent filtrate from immersing into a producing layer to pollute the producing layer, zero free water in the system can prevent the shale with strong water sensitivity from hydration expansion to block an oil gas original seepage channel, maintain the original strength of a stratum, have good protection effect on the oil gas layer, particularly a water-sensitive reservoir layer, and improve the development efficiency of an oil gas field.
The foregoing description is only an overview of the present invention, and is intended to provide a more thorough understanding of the present invention, and is to be accorded the full scope of the present invention.
Detailed Description
In order to further describe the technical means and effects adopted by the invention to achieve the preset aim, the following is a detailed description of the specific implementation, structure, characteristics and effects of the low-density whole oil-based workover fluid and the preparation method thereof according to the invention in combination with the preferred embodiment. In the following description, different "an embodiment" or "an embodiment" do not necessarily refer to the same embodiment. Furthermore, the particular features, structures, or characteristics of one or more embodiments may be combined in any suitable manner.
The percentages below, unless otherwise indicated, are percentages by weight. In the following examples of the present invention, unless otherwise indicated, all components referred to are commercially available products well known to those skilled in the art.
Some embodiments of the invention provide a low-density whole oil-based workover fluid, which comprises the following components in percentage by weight and volume:
base oil: 100 parts;
organic soil: 3.0-6.0 parts;
calcium oxide: 2.0-4.0 parts;
emulsifying agent: 1.2-3.2 parts;
wetting agent: 1.5-3.0 parts;
tackifier: 1.0-2.0 parts;
filtrate reducer: 2.0-4.0 parts;
high strength reducing agent: 0-40 parts.
In the technical scheme, the functions of the components are as follows:
base oil: is used as a base liquid.
Organic soil: the viscosity and the shear force of the well repairing liquid are adjusted, and the filtration loss of the drilling liquid is reduced in an auxiliary manner; if the weight and volume percentage of the organic soil is lower than 3.0 parts, the viscosity and the shearing force of the well repairing liquid cannot meet the construction design requirements; if the weight and volume percentage of the organic soil is higher than 6.0 parts, the viscosity and the shear force of the workover fluid are too high, the pumping is not facilitated, and well leakage is caused.
Calcium oxide: the alkalinity of the workover fluid is adjusted; if the weight and volume percentage of the calcium oxide is lower than 2.0 parts, the alkalinity of the well servicing fluid is lower than the construction design requirement; if the weight-volume percentage ratio of the calcium oxide is higher than 4.0 parts, the alkalinity of the well repairing liquid is higher than the construction design requirement and the cost is higher.
Emulsifying agent: for providing the desired emulsion stability of the workover fluid; if the weight volume percentage of the emulsifier is lower than 1.2 parts, the demulsification voltage of the well servicing fluid is lower than the construction design requirement; if the weight volume percentage of the emulsifier is higher than 3.2 parts, the demulsification voltage of the well repair liquid is higher than the construction design requirement and the cost is higher.
Wetting agent: for converting a hydrophilic solid phase into lipophilicity; if the weight volume percentage of the wetting agent is lower than 1.5 parts, the viscosity of the well servicing fluid is higher than the construction design requirement; if the weight volume percent of the wetting agent is higher than 3.0 parts, the cost of the workover fluid may be increased.
Tackifier: the hydraulic oil pump is used for improving the cutting force of the workover fluid and assisting in reducing the filtrate loss of the workover fluid; if the weight and volume percentage of the tackifier is lower than 1.0 part, the viscosity and the shear force of the workover fluid are lower than the construction design requirements; if the weight-to-volume percentage of the tackifier is higher than 2.0 parts, the viscosity and shear force of the workover fluid are higher than those of the construction design requirements and the cost is increased.
Filtrate reducer: the method is used for reducing the fluid loss of the workover fluid; if the weight and volume percentage of the filtrate reducer is lower than 2.0 parts, the high-temperature filtrate loss of the workover fluid is lower than the construction design requirement; if the weight and volume percent ratio of the filtrate reducer is higher than 4.0 parts, the high-temperature filtrate loss of the workover fluid is higher than the construction design requirement and the cost is increased.
High strength reducing agent: the density of the workover fluid is adjusted; if the weight volume percentage of the high-strength reducer is higher than 40 parts, the viscosity cutting of the workover fluid and the difficulty in demulsification voltage regulation are high.
The low-density whole oil-based well workover fluid refers to a density of less than or equal to 0.9g/cm 3 Is used for the whole oil-based well repairing liquid.
In some embodiments, optionally, wherein the base oil is selected from one of a 0# diesel, a 3# white oil, a 5# white oil, and a synthetic base oil (e.g., polyalphaolefins, acetals, linear alpha-olefins, internal olefins, linear alkylbenzenes, linear paraffins, and the like).
In some embodiments, optionally, wherein the organoclay is a lipophilic clay, which is a commercially available product from Hubei Han New technology Co., ltd.
In some embodiments, optionally, wherein the emulsifier is present in an amount of (1.0-2.0): and (0.5-1.0) an emulsifier A and an emulsifier B. The weight ratio of the emulsifier A to the emulsifier B is lower than (1.0-2.0): the lower limit value of (0.5-1.0) or higher than (1.0-2.0): an upper limit of (0.5-1.0) may result in a breakdown voltage that is less than optimal.
In some embodiments, optionally, wherein the emulsifier a is oleic acid; the emulsifier B is sulfonate. Specific tests show that the two are relatively better in improving the emulsion stability.
In some embodiments, optionally, wherein the emulsifier a is cis-octadecen-9-oic acid or octadecenoic acid; specific tests show that the two materials have relatively better effect in improving the emulsion stability. The emulsifier B is at least one selected from petroleum ferric sulfonate, alkyl aryl sodium sulfonate and alkyl sodium succinate sulfonate. Specific tests show that the three materials have relatively better effect in improving the emulsion stability.
In some embodiments, optionally, the wetting agent is a surfactant capable of converting hydrophilic species to lipophilic, such as dodecyltrimethylammonium chloride. The wetting agent is selected in consideration of whether the wetting agent can convert the surface of hydrophilic particles (such as a high-strength reducer) in the workover fluid into lipophilicity, wherein the cross-sectional diameter of a polar group of the wetting reversal agent is smaller than that of a nonpolar group, namely d pole/d nonpolar is less than 1; has no adverse effect on the electrical stability of the workover fluid.
In some embodiments, optionally, wherein the viscosity enhancing agent is selected from organic soaps, such as calcium stearate. The selection of the viscosifier needs to take into account whether it can promote hydraulic shear and static shear of the workover fluid.
In some embodiments, optionally, wherein the fluid loss additive is selected from at least one of organic lignite and asphalt oxide. The high-temperature high-pressure fluid loss of the workover fluid is controlled by selecting the two fluid loss additives.
In some embodiments, optionally, wherein the high strength reducer is glass microbeads having a density of 0.44g/cm 3 The grain diameter is more than or equal to 90 mu m, D50 is more than or equal to 60 mu m, and the compressive strength is higher than or equal to 60 mu m>8000psi (55.16 MPa). If D50 is less than 60 μm, the material cost increases; if D50 is higher than 90. Mu.m, the cost of formulation increases. The choice of high strength reducing agent is primarily concerned with particle size and compressive strength for better reducing the density of the workover fluid.
Some embodiments of the invention provide a method for preparing a low-density whole oil-based workover fluid, which sequentially comprises the following steps:
1) Adding the organic soil into the base oil according to a proportion under the condition of high-speed stirring, and stirring for 5-10min to fully and uniformly stir the base oil to obtain base slurry;
2) Adding calcium oxide, an emulsifying agent, a wetting agent, a filtrate reducer and a tackifier into the base slurry obtained in the step 1) in proportion, and respectively stirring at a high speed for 5-10min to dissolve or uniformly disperse the materials to obtain a glue solution;
3) Adding a high-strength reducer into the glue solution obtained in the step 2) according to a proportion, and stirring at a high speed for 10-20min to enable the density to reach a construction requirement value; the construction requirement value is generally determined according to customer requirements.
4) Stirring the semi-finished product of the workover fluid obtained in the step 3) at a high speed for 2-3h to enable the semi-finished product to be fully sheared, and obtaining the low-density full oil-based workover fluid.
In some embodiments, optionally, in step 2), the calcium oxide, the emulsifier, the wetting agent, the fluid loss additive and the tackifier are added in sequence to the base slurry, and are the next components after the components are dissolved or uniformly dispersed.
In some embodiments, optionally, wherein in step 1) to step 4), the high speed stirring is performed at a speed of 10000 to 11000r/min.
Some embodiments of the invention also provide an application of the low-density full oil-based workover fluid in workover construction, the workover fluid has good performance and stratum compatibility, high-temperature stability, no pollution and damage to an oil-gas layer, the density meets the requirements of balancing stratum pressure and well control, and the workover safety is ensured. The use of the workover fluid is well known in the art and will not be described in detail herein.
The invention is further illustrated below with reference to specific examples.
Example 1
This example provides a density of 0.90g/cm 3 The low-density full oil-based workover fluid comprises the following components in percentage by weight and volume: 100 parts of 0# diesel; 6 parts of organic soil; 3 parts of calcium oxide; 1.5 parts of emulsifier (compounded by octadecenoic acid and petroleum ferric sulfonate according to the weight ratio of 2:1); 1.5 parts of wetting agent (dodecyl trimethyl ammonium chloride); 1.2 parts of tackifier (calcium stearate); 3 parts of filtrate reducer (oxidized asphalt).
The preparation method of the low-density whole oil-based workover fluid comprises the following steps in sequence:
1) Adding organic soil into 0# diesel oil according to the proportion under the condition of high-speed stirring of 11000r/min, stirring for 5min, and fully and uniformly stirring to obtain base slurry;
2) Adding calcium oxide, an emulsifying agent, a wetting agent, a filtrate reducer and a tackifier into the base slurry obtained in the step 1) in proportion, and respectively stirring at a high speed for 5min to dissolve or uniformly disperse the materials to obtain a glue solution;
3) Stirring the glue solution obtained in the step 2) at a high speed for 20min, and measuring the density value to obtain the glue solution with the density of 0.90g/cm 3 A workover fluid semi-finished product;
4) Stirring the semi-finished product of the workover fluid obtained in the step 3) at a high speed for 2 hours to fully shear the semi-finished product of the workover fluid to obtain the low-density full oil-based workover fluid with the density of 0.90g/cm 3 。
Example 2
This example provides a density of 0.80g/cm 3 The low-density full oil-based workover fluid comprises the following components in percentage by weight and volume: 100 parts of 0# diesel; 5 parts of organic soil; 3 parts of calcium oxide; emulsifying agent (from octadecenoic acid, petroleum iron sulfonate)Compounding according to the weight ratio of 2:1) 1.8 parts; 1.7 parts of wetting agent (dodecyl trimethyl ammonium chloride); 1.4 parts of tackifier (calcium stearate); 3 parts of filtrate reducer (oxidized asphalt); high strength reducer (glass microsphere with particle size of 0.44 g/cm) 3 Particle size d50=68.8 μm and compressive strength 61.28 MPa) 10 parts.
The preparation method of the low-density whole oil-based workover fluid comprises the following steps in sequence:
1) Adding organic soil into the 0# diesel oil according to the proportion under the condition of high-speed stirring of 11000r/min, and stirring for 5min to fully and uniformly stir the mixture;
2) Adding calcium oxide, an emulsifying agent, a wetting agent, a filtrate reducer and a tackifier into the base slurry obtained in the step 1) in proportion, and respectively stirring at a high speed for 5min to dissolve or disperse uniformly;
3) Adding a high-strength reducer into the glue solution obtained in the step 2) in proportion, and stirring at a high speed for 20min to ensure that the density reaches the construction requirement value to obtain the density of 0.80g/cm 3 A workover fluid semi-finished product;
4) Stirring the semi-finished product of the workover fluid obtained in the step 3) at a high speed for 2 hours to fully shear the semi-finished product of the workover fluid to obtain the low-density full oil-based workover fluid with the density of 0.80g/cm 3 。
Example 3
This example provides a density of 0.70g/cm 3 The low-density full oil-based workover fluid comprises the following components in percentage by weight and volume: 100 parts of 3# white oil; 5.8 parts of organic soil; 3 parts of calcium oxide; 1.8 parts of emulsifier (compounded by octadecenoic acid and petroleum ferric sulfonate according to the weight ratio of 2:1); 2 parts of wetting agent (dodecyl trimethyl ammonium chloride); 1.8 parts of tackifier (calcium stearate); 3 parts of filtrate reducer (oxidized asphalt); high strength reducer (glass microsphere with particle size of 0.44 g/cm) 3 Particle size d50=68.8 μm and compressive strength 61.28 MPa) 30 parts.
The preparation method of the low-density whole oil-based workover fluid comprises the following steps in sequence:
1) Adding organic soil into the 3# white oil according to the proportion under the condition of high-speed stirring of 11000r/min, and stirring for 5min to fully and uniformly stir;
2) Adding calcium oxide, an emulsifying agent, a wetting agent, a filtrate reducer and a tackifier into the base slurry obtained in the step 1) in proportion, and respectively stirring at a high speed for 5min to dissolve or disperse uniformly;
3) Adding a high-strength reducer into the glue solution obtained in the step 2) in proportion, and stirring at a high speed for 20min to enable the density to reach the construction requirement value, thereby obtaining the density of 0.70g/cm 3 A workover fluid semi-finished product;
4) Stirring the semi-finished product of the workover fluid obtained in the step 3) at a high speed for 3 hours to enable the semi-finished product to be fully sheared, thereby obtaining the low-density full oil-based workover fluid with the density of 0.70g/cm 3 。
Example 4
This example provides a density of 0.60g/cm 3 The low-density full oil-based workover fluid comprises the following components in percentage by weight and volume: 100 parts of 0# white oil; 5.8 parts of organic soil; 3 parts of calcium oxide; 2.8 parts of emulsifier (compounded by octadecenoic acid and petroleum ferric sulfonate according to the weight ratio of 2:1); 2 parts of wetting agent (dodecyl trimethyl ammonium chloride); 1.6 parts of tackifier (calcium stearate); 3 parts of filtrate reducer (oxidized asphalt); high strength reducer (glass microsphere with particle size of 0.44 g/cm) 3 Particle diameter d50=68.8 μm and compressive strength 61.28 MPa) 40 parts.
The preparation method of the low-density whole oil-based workover fluid comprises the following steps in sequence:
1) Adding organic soil into the 0# white oil according to the proportion under the condition of high-speed stirring of 11000r/min, and stirring for 5min to fully and uniformly stir;
2) Adding calcium oxide, an emulsifying agent, a wetting agent, a filtrate reducer and a tackifier into the base slurry obtained in the step 1) in proportion, and respectively stirring at a high speed for 5min to dissolve or disperse uniformly;
3) Adding a high-strength reducer into the glue solution obtained in the step 2) in proportion, and stirring at a high speed for 20min to enable the density to reach the construction requirement value, thereby obtaining the density of 0.60g/cm 3 A workover fluid semi-finished product;
4) Stirring the semi-finished product of the workover fluid obtained in the step 3) at a high speed for 3h to enableThe low-density full oil-based well workover fluid is obtained by fully shearing the low-density full oil-based well workover fluid, and the density of the low-density full oil-based well workover fluid is 0.60g/cm 3 。
Comparative example 1
The difference compared with example 1 is that the comparative example does not contain an emulsifier, and the rest of the materials and the addition amounts are unchanged.
Comparative example 2
The difference compared with example 2 is that the weight and volume percentage of the filtrate reducer in this comparative example is 1 part, and the rest materials and the addition amount are unchanged.
Comparative example 3
The difference compared with example 3 is that the weight and volume percentage of the tackifier in this comparative example is 3 parts, and the rest materials and the addition amount are unchanged.
Comparative example 4
The difference compared with example 4 is that the weight-volume percentage of the high-strength reducing agent in this comparative example is 43 parts, and the remaining materials and the addition amounts are unchanged.
The above examples 1-4 and comparative examples 1-4 were added in the order of formulation, and stirred at high speed with sufficient shear to give low density whole oil based workover fluids example 1, example 2, example 3, example 4 and comparative examples 1,2, comparative example 3, comparative example 4.
High temperature rheology and emulsion stability testing. The low-density full oil-based well servicing fluids obtained in 4 examples and 4 comparative examples were subjected to rolling aging for 16 hours at corresponding aging temperatures, and performance tests before and after rolling aging were performed according to the oil-based drilling fluid test procedure (GB/T16783.2-2012), and the test results are shown in Table 1.
TABLE 1 full oil based workover fluid fluids of examples 1-3 at different temperatures
As can be seen from Table 1, the viscosity, static shear force and dynamic shear force of the low-density whole oil-based workover fluid of examples 1-4 of the present invention all increase with decreasing density under the same aging temperature condition, but the viscosity-shear value is still at a reasonable value and the ES is over 900V; under the same density condition, after high-temperature rolling aging at 110 ℃, 150 ℃ and 180 ℃, the viscosity, static shearing force and dynamic shearing force of the low-density whole oil-based well workover fluid are reduced along with the increase of temperature, but the viscosity shearing values are moderate and the ES exceeds 900V, which shows that the low-density whole oil-based well workover fluid disclosed by the embodiments 1-4 of the invention has good rheological property and emulsion stability under different working conditions, and can ensure that the low-density whole oil-based well workover fluid does not settle after standing at high temperature for a long time. Compared with the embodiment 1, the comparative example 1 does not add an emulsifying agent, so that the demulsification voltage of the oil-based well servicing fluid is greatly reduced, the emulsification stability is deteriorated, meanwhile, the high-temperature high-pressure filtration loss is greatly increased, the high-temperature stability of the system is poor, and the requirement of well servicing operation performance is not met; compared with the embodiment 2, the weight and volume percentage of the filtrate reducer of the comparative example 2 is reduced by 66 percent, so that the high-temperature and high-pressure filtrate loss is greatly increased, and the control requirement of well repair operation on the high-temperature and high-pressure filtrate loss cannot be met; compared with example 3, the weight and volume percentage of the tackifier of comparative example 3 is increased by 50%, so that the viscosity and shear of the oil-based workover fluid are greatly increased, high pumping pressure is caused when pumping down the well, the difficulty of pumping is increased, and lost circulation is easily caused; compared with example 4, the weight and volume percentage of the high-strength reducer in comparative example 4 is increased to 43 parts, so that the viscosity and cutting of the oil-based well servicing fluid are greatly increased, the emulsion breaking voltage is greatly reduced, the difficulty of pumping is increased, well leakage is easily caused, and the emulsion breaking voltage is greatly reduced, so that the emulsion stability of the well servicing fluid is not facilitated.
And (5) testing high-temperature sedimentation stability. The low-density whole oil-based workover fluid disclosed by the 3 embodiments of the invention is respectively stood for 7 days, 10 days and 15 days at 110 ℃, 150 ℃ and 180 ℃, and then a glass rod is used for bottom detection, so that experimental phenomena are recorded. The stratification index is tested using a static stratification index method. The static layering index method is a method for quantitatively and qualitatively evaluating static settlement stability of drilling and completion fluid, firstly, a sample is placed in a closed container at a specific temperature for a set time, then free fluid and average density of each layering of the sample are tested, a static layering index (Static Stratification Index) is calculated through a formula (1), SSI value is short, the larger the SSI value is, the more serious the solid phase settlement is, the worse the settlement stability is, and otherwise, the better the settlement stability of the drilling and completion fluid is. The detection result of the method can intuitively reflect the deviation degree of density redistribution formed by sedimentation of the workover fluid and the density before sedimentation, and the SSI value can judge the static sedimentation degree of the workover fluid.
Wherein: v% i -the volume fraction of each layer in the ageing tank;
ΔMW i density difference, g/cm, between each layer of workover fluid and the initial workover fluid 3 ；
The test results are shown in Table 2.
TABLE 2 sedimentation stability Properties of Low Density oil-based well servicing fluids obtained in examples 1-4
As can be seen from Table 2, the low-density whole oil-based workover fluids according to examples 1 to 4 of the present invention were allowed to stand at 110℃and 150℃for 7 days, at 180℃for 10 days and at 15 days, respectively, and were evaluated by the rod falling method, and were free from bottom to side, and had no hard precipitate at the bottom; the static delamination index values SSI of the test are all smaller than 0.16 and lower than 0.20 required by the site construction standard, which shows that the low-density full oil-based well servicing fluid disclosed by the embodiments 1-4 of the invention does not settle after standing at a high temperature for a long time, and has very good high-temperature stability.
The low density oil-based workover fluids prepared in examples 1-3 above were subjected to permeability recovery value evaluation tests (examples 1,2,3 corresponding to numbers 1,2,3, two sets of experiments were performed in each example) according to SY/T-6540-2002 drilling fluid completion fluid damage reservoir indoor evaluation method, and the specific test results are shown in Table 3.
Table 3 permeability recovery data for low density oil-based workover fluids described in examples 1-3
As can be seen from the data in Table 3, the average permeability recovery values of the low-density whole oil-based well servicing fluid in examples 1,2,3 and 4 of the present invention are 91.5%, 92.1%, 92.4% and 91.7%, respectively, and the average permeability recovery values are above 91%, which indicates that the low-density whole oil-based well servicing fluid of the present invention has little damage to hydrocarbon reservoirs and is beneficial to hydrocarbon reservoir protection.
In conclusion, the low-density full oil-based well workover fluid provided by the invention aims at a complex oil and gas reservoir of an abnormally low-pressure stratum, strong water-sensitive lithology and stratum loss old oil area, and has the lowest equivalent density of 0.60g/cm 3 Is used for construction of the workover fluid. The workover fluid system has stable rheological property, fluid loss property and emulsion stability at high temperature (up to 180 ℃), is static at constant temperature for more than 15 days, and has good sedimentation stability; the recovery value of the core permeability after the well repairing liquid is polluted reaches more than 91%; for an abnormally low pressure well, the controllable density range is wide (0.6-0.9 g/cm) 3 ) The method can effectively prevent filtrate and solid phase from immersing into a production layer, does not cause the pollution of the production layer, can prevent the hydration expansion of the shale with strong water sensitivity from blocking an oil gas original seepage channel, keeps the original strength of a stratum, has excellent reservoir protection performance, has good protection effect on the oil gas layer, particularly a water-sensitive reservoir, and improves the development efficiency of oil and gas fields.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.
It will be appreciated that the relevant features of the apparatus described above may be referred to with respect to each other. In addition, the "first", "second", and the like in the above embodiments are for distinguishing the embodiments, and do not represent the merits and merits of the embodiments.
In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
The numerical ranges recited herein include all numbers within the range and include any two of the range values within the range. The different values of the same index appearing in all embodiments of the invention can be combined arbitrarily to form a range value.
The technical features of the claims and/or the description of the present invention may be combined in a manner not limited to the combination of the claims by the relation of reference. The technical scheme obtained by combining the technical features in the claims and/or the specification is also the protection scope of the invention.
The above description is only of the preferred embodiments of the present invention, and is not intended to limit the present invention in any way, but any simple modification, equivalent variation and modification made to the above embodiments according to the technical substance of the present invention still fall within the scope of the technical solution of the present invention.
Claims (10)
1. The low-density full oil-based well workover fluid is characterized by comprising the following components in percentage by weight and volume:
base oil: 100 parts;
organic soil: 3.0-6.0 parts;
calcium oxide: 2.0-4.0 parts;
emulsifying agent: 1.2-3.2 parts;
wetting agent: 1.5-3.0 parts;
tackifier: 1.0-2.0 parts;
filtrate reducer: 2.0-4.0 parts;
high strength reducing agent: 0-40 parts.
2. The low density, whole oil based well servicing fluid of claim 1, wherein the organic soil is a lipophilic clay; the weight ratio of the emulsifier to the emulsifier is (1.0-2.0): and (0.5-1.0) an emulsifier A and an emulsifier B.
3. The low density whole oil based workover fluid of claim 2, wherein the emulsifier a is an oleic nonionic surfactant; the emulsifier B is sulfonate.
4. The low density, whole oil based well servicing fluid of claim 3, wherein emulsifier a is cis-octadecene-9-oic acid or octadecenoic acid; the emulsifier B is at least one selected from petroleum ferric sulfonate, alkyl aryl sodium sulfonate and alkyl sodium succinate sulfonate.
5. The low density, whole oil based well servicing fluid of claim 1, wherein the fluid loss additive is selected from at least one of organic lignite and oxidized asphalt; the high-strength lightening agent is glass microsphere with the density of 0.44g/cm 3 The grain diameter is more than or equal to 90 mu m, D50 is more than or equal to 60 mu m, and the compressive strength is higher than or equal to 60 mu m>8000psi (55.16 MPa); the base oil is selected from one of 0# diesel oil, 3# white oil, 5# white oil and synthetic base oil.
6. The low density, whole oil based well servicing fluid of claim 1, wherein the base oil is selected from one of a diesel oil, a white oil, and a synthetic base oil.
7. A method of preparing a low density whole oil based well servicing fluid as defined in any one of claims 1-6 comprising the steps of, in order:
1) Adding the organic soil into the base oil according to the proportion under the condition of high-speed stirring, and stirring for 5-10min to fully and uniformly stir the base oil;
2) Adding calcium oxide, an emulsifying agent, a wetting agent, a filtrate reducer and a tackifier into the base slurry obtained in the step 1) in proportion, and respectively stirring at a high speed for 5-10min to dissolve or disperse uniformly;
3) Adding a high-strength reducer into the glue solution obtained in the step 2) according to a proportion, and stirring at a high speed for 10-20min to enable the density to reach a construction requirement value;
4) Stirring the semi-finished product of the workover fluid obtained in the step 3) at a high speed for 2-3h to enable the semi-finished product to be fully sheared, and obtaining the low-density full oil-based workover fluid.
8. The method for preparing a low-density whole oil-based well servicing fluid according to claim 7, wherein in step 2), calcium oxide, an emulsifying agent, a wetting agent, a fluid loss additive and a tackifier are sequentially added to the base slurry, and are the next components after the components are dissolved or uniformly dispersed.
9. The method for preparing a low-density whole oil-based well servicing fluid according to claim 7, wherein in steps 1) to 4), the high-speed stirring speed is 10000 to 11000r/min.
10. Use of a low density whole oil based workover fluid as defined in any one of claims 1 to 6 in a workover operation.
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