CN116200178A - Reservoir reconstruction liquid and preparation and application thereof - Google Patents
Reservoir reconstruction liquid and preparation and application thereof Download PDFInfo
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- CN116200178A CN116200178A CN202310059737.XA CN202310059737A CN116200178A CN 116200178 A CN116200178 A CN 116200178A CN 202310059737 A CN202310059737 A CN 202310059737A CN 116200178 A CN116200178 A CN 116200178A
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- 238000002360 preparation method Methods 0.000 title abstract description 13
- 239000012530 fluid Substances 0.000 claims abstract description 77
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 60
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 50
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims abstract description 33
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 claims abstract description 33
- 238000011161 development Methods 0.000 claims abstract description 32
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- 238000002407 reforming Methods 0.000 claims abstract description 8
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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
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
- C09K8/528—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning inorganic depositions, e.g. sulfates or carbonates
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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
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
- C09K8/524—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning organic depositions, e.g. paraffins or asphaltenes
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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
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
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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
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/584—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific surfactants
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- General Life Sciences & Earth Sciences (AREA)
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- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Inorganic Chemistry (AREA)
Abstract
The invention provides reservoir reconstruction liquid and preparation and application thereof. The reservoir reconstruction liquid comprises the following components in parts by weight: 20.0 to 30.0 parts of seepage promoter, 10.0 to 20.0 parts of double-effect reservoir reconstruction agent and 100 parts of water; wherein the seepage promoter comprises methanol, diethylene glycol monobutyl ether and propylene glycol; the double-effect reservoir reformation agent comprises formic acid, hydroxyethyl ethylenediamine triacetic acid and benzenesulfonic acid. The reservoir reforming fluid can realize the yield increase of conventional development wells and conventional directional wells of conventional oil and gas reservoirs, can realize the yield increase of low-permeability oil and gas reservoir level adjustment wells with higher difficulty, and is suitable for various oil and gas reservoir development wells.
Description
Technical Field
The invention belongs to the technical field of oil and gas reservoir development well yield increase. More particularly, to a reservoir reconstruction fluid, and preparation and application thereof.
Background
In order to realize stable production and up production, increase the reserve utilization degree and increase the recovery ratio, after the oil and gas field is put into development for a plurality of years, a batch of adjustment wells are drilled in stages on the basis of the original well pattern, and the adjustment wells can be scattered wells or encrypted wells in batches. According to the oil-gas field development adjustment scheme, adjusting well to be used for improving well pattern and implementing in-situ subdivision exploitation in later period of old oil field development; some of the oil recovery method is used for recovering reserve loss of dead oil areas, improving water injection development effects of fault shielding areas, adjusting development effects of areas with serious differences of oil extraction effects in the transverse direction and the longitudinal direction, and the like. In sum, the purposes of expanding the oil sweeping area, increasing the recoverable reserves, improving the oil extraction speed, improving the development effect, excavating the residual oil and stabilizing the yield and increasing the yield can be achieved by drilling the adjusting well. The development practice of the oil field at home and abroad shows that the oil field development enters the middle and later stages, and the well pattern is timely encrypted and adjusted, thereby being very beneficial to stabilizing the oil field yield and improving the oil extraction speed. However, the adjustment well has a plurality of differences from the conventional development well, the single well production influencing factors of the adjustment well are complex and various, and the adjustment well of the low permeability hydrocarbon reservoir is more difficult to increase in production than the conventional development well because of the complex transverse communication relationship of the low permeability hydrocarbon reservoir, the large number of longitudinally small barriers and the large number of water unswept zones formed in the development area.
During the earlier stage of drilling and completion, external liquid and solid may invade the oil layer in the working fluid, and the working fluid and clay or other matters in the oil layer have physical and chemical action to pollute the near-wellbore area, so that the permeability of the oil layer around the well hole is reduced, the oil flow resistance is increased, the crude oil yield is reduced, and the phenomenon is more serious for the well regulation of medium-low permeability hydrocarbon reservoirs. In addition, the adjusting well of the low-permeability oil and gas reservoir also faces the problems of low yield, no oil out of water and even no yield and the like caused by insufficient stratum energy.
In addition, the horizontal well is more easily polluted by external fluid in the process of drilling and completing because of well pattern structure adjustment, pressure system change and large contact surface of the naked eye, and the reservoir protection difficulty is greater than that of a conventional directional well.
At present, the working procedure before the production of the low permeability reservoir level adjustment well is drilling, gel breaking and well completion, the corresponding well entering fluid is drilling fluid, gel breaking fluid and well completion fluid, and no production increasing reservoir improvement measures are adopted before the production. In order to meet engineering requirements of horizontal adjustment well drilling, well bore cleaning, well wall stabilization, friction control, well bore lubrication and the like, and reservoir protection requirements, a rapid weak gel system is generally selected as drilling fluid, and the drilling fluid system contains polymer flow type regulator, filtrate reducer, acid-soluble temporary plugging agent and the like. In order to prevent damage such as polymer blockage, solid phase particle blockage and the like, gel breaking liquid is used for removing residual drilling fluid, perforated pipe/screen pipe and well wall mud cake of an open hole section, invisible acid completion fluid is used for dissolving temporary blocking particles, removing inorganic scale and improving compatibility of well entering fluid and stratum fluid. In fact, however, conventional gel-breaking-completions alone do not completely remove the near wellbore plugs and reservoir contaminates from the earlier operations, and are mainly represented by the following aspects:
1) The gel breaker is a chlorine-containing oxidant, can only degrade macromolecules through oxidization, can not dissolve temporary plugging agents and inorganic scales, has relatively single function, and does not have reservoir reformation; the gel breaking liquid is suspension liquid, has poor self-cleaning property, and can generate new blockage when being unblocked after entering a well.
2) The addition amount of the invisible acid in the well completion fluid is generally about 0.5% (w/v), the invisible acid is weak in acidity, and the performances of dissolving temporary plugging particles, dissolving inorganic scale, improving compatibility among fluids and the like are good in single evaluation, but once the pollution occurs simultaneously in an open hole section and a near wellbore zone, the pollution removing capability of the invisible acid well completion fluid can only be limited in a certain range when superposition damage occurs, the early-stage damage of the open hole section and the near wellbore zone can not be completely removed, and the requirement of the production increase and reservoir transformation in the deep part of a reservoir can not be met.
3) Conventional gel breaking-well completion does not consider that the earlier fluid liquid phase invasion causes the reservoir wettability to change, and thus causes the oil flow resistance to increase, nor does it consider the pressure reduction and drainage assistance measures required by the formation energy shortage, and causes water flow to occupy the central pore canal, so that the contradiction between the oil flow resistance increase and the water flow to occupy the central pore canal may be more prominent in the horizontal adjustment well.
In summary, conventional gel breaking-completion cannot be completely removed, either from solid phase blockage by temporary plugging agents, inorganic scales, and the like caused by the earlier well-entering fluid, or from pollution blockage by polymers, and the like, caused by liquid phase invasion. After the conventional gel breaking-well completion is completed, the problems of blockage damage to the open hole section and the near wellbore zone before production, weakening of the energy of the well stratum, and the like still exist, and low production after production or even no production is caused directly.
Therefore, the reservoir reformation liquid can be used for not only conventional development wells and conventional directional wells of conventional oil and gas reservoirs, but also low-permeability oil and gas reservoir level adjustment wells with higher difficulty, and the reservoir reformation liquid for increasing production is needed for increasing production of the oil and gas reservoir development wells before the production of the oil and gas reservoir development wells.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a reservoir reforming fluid and preparation and application thereof, and the reservoir reforming fluid is used for the stimulation reservoir reforming before the production of a reservoir development well, so that the stimulation of a conventional development well and a conventional directional well of a conventional reservoir can be realized, and the stimulation of a low-permeability reservoir level adjustment well with higher difficulty can also be realized.
It is a first object of the present invention to provide a reservoir retrofit fluid.
A second object of the present invention is to provide a method for preparing the above reservoir reforming fluid.
A third object of the present invention is to provide the use of a reservoir retrofit fluid as described above in stimulation of a reservoir development well.
The above object of the present invention is achieved by the following technical scheme:
the invention provides reservoir reconstruction liquid which comprises the following components in parts by weight: 20.0 to 30.0 parts of seepage promoter, 10.0 to 20.0 parts of double-effect reservoir reconstruction agent and 100 parts of water;
wherein the seepage promoter comprises methanol, diethylene glycol monobutyl ether and propylene glycol; the double-effect reservoir reformation agent comprises formic acid, hydroxyethyl ethylenediamine triacetic acid and benzenesulfonic acid.
After drilling, positively circulating the reservoir reconstruction liquid provided by the invention into a perforated pipe/screen pipe of an open hole section of a horizontal well, soaking and breaking gel, so that residual drilling liquid, the perforated pipe/screen pipe and a well wall mud cake of the open hole section can be completely broken gel and unblocked, and then positively extruding the reservoir reconstruction liquid to the stratum to finish unblocking of a near-wellbore zone of the horizontal well and deep reservoir reconstruction; after completion, the reservoir reconstruction fluid is positively circulated to the perforation section of the directional well, and then is extruded into the stratum, so that the blocking removal of the near-wellbore zone of the directional well and the deep reservoir reconstruction can be completed. Therefore, the reservoir reforming fluid can not only realize the production increase of the conventional development well and the conventional directional well of the conventional oil and gas reservoir, but also realize the production increase of the low-permeability oil and gas reservoir level adjustment well with higher difficulty, and is suitable for various oil and gas reservoir development wells.
The seepage promoter of the invention not only can obviously improve the wettability of a reservoir stratum to ensure that the reservoir stratum is strong in hydrophilicity, but also can obviously reduce the viscosity of crude oil, is favorable for quickly reducing the flow viscosity of crude oil with increased viscosity caused by degassing or deposition in a near-wellbore zone, and further ensures that oil flow quickly occupies a central pore canal and the seepage capability is obviously improved. In addition, the seepage promoter can also improve the acid liquor seepage speed of the hypotonic ultralow permeability reservoir by about 1.5 times, solves the difficult problem of low-hole hypotonic acid liquor extrusion injection, accelerates the seepage propelling speed of the low-hole hypotonic acid liquor, and is beneficial to realizing deep acidification of reservoir reconstruction liquid. The seepage-promoting capability of the seepage-promoting agent is bidirectional, the capability of acid liquor entering a reservoir is improved in the early stage, and the reservoir is beneficial to realizing pressure reduction and flowback of oil flow after transformation, so that the seepage-promoting agent has double functions.
The double-effect reservoir remodelling agent not only can acidolyze a residual drilling fluid system (the gel breaking rate of a gel solution reaches more than 95 percent), a perforated pipe/screen pipe and a well wall retention mud cake (the mud cake clearance rate is improved by more than 20 percent) at an open hole section, but also can invade polymer macromolecules in reservoir filtrate, dissolve a skeleton particle temporary plugging agent of the polymer macromolecules, and remove inorganic scale generated in a near-wellbore zone, thereby thoroughly relieving solid phase blockage and liquid phase incompatibility caused by a well entering fluid in the earlier stage; the double-effect reservoir reconstruction agent has certain corrosion on reservoir cement, can moderately erode reservoir minerals, plays a role in hole expansion and reaming, and has good double-effect characteristics of blocking removal and reservoir reconstruction.
According to the invention, after the influence factors of the damage of the drilling fluid reservoir are clarified, the reservoir reconstruction fluid which has the yield increasing effect and can be suitable for the low permeability reservoir level adjustment well is developed while the protection performance of the low permeability reservoir drilling fluid reservoir is optimized and upgraded on the basis of a conventional development well, and the reservoir reconstruction fluid is selected and implemented under the condition of not changing or slightly changing the construction process, so that the problems of flowback caused by insufficient formation energy are thoroughly solved while the early-stage pollution is relieved, the damage of an oil layer is effectively prevented, the reservoir is fully reconstructed, the yield increasing effect is achieved, and the comprehensive benefit of oilfield development is improved.
Preferably, a water lock control agent and a water sensitive control agent are also included.
Because the adjusting well of the low permeability hydrocarbon reservoir is also subjected to strong water sensitivity and extremely strong water lock damage caused by the rise of water saturation, the invention also adds the water lock control agent and the water lock control agent into the reservoir reconstruction liquid, improves the expansion and contraction resistance of the reservoir reconstruction liquid, reduces the oil interfacial tension of the reservoir reconstruction liquid, endows the reservoir reconstruction liquid with good water lock control capability, can effectively avoid the occurrence of water lock water sensitivity damage, and can well relieve the water lock water sensitivity damage generated by earlier operation.
Further preferably, the water lock control agent is 2.0 to 4.0 parts by weight.
Further preferably, the water sensitive control agent is 2.0 to 2.5 parts by weight.
Most preferably, the reservoir remodelling liquid comprises the following components in parts by weight: 30.0 parts of seepage promoter, 20.0 parts of double-effect reservoir reconstruction agent, 4.0 parts of water lock control agent, 2.5 parts of water sensitive control agent and 100 parts of water.
Preferably, in the seepage promoter, the mass ratio of the methanol, the diethylene glycol monobutyl ether and the propylene glycol is 0.1-0.2: 2.0 to 4.0:0.5 to 1.0, most preferably 0.2:4.0:1.0.
preferably, in the double-effect reservoir reconstruction agent, the mass ratio of formic acid, hydroxyethyl ethylenediamine triacetic acid and benzenesulfonic acid is 2-3: 5-10: 3 to 5, most preferably 3:10:5.
preferably, the water lock control agent comprises ethanol, a nonionic fluorocarbon surfactant.
Preferably, in the water lock control agent, the mass ratio of the ethanol to the nonionic fluorocarbon surfactant is 0.1-0.2: 2 to 3, most preferably 0.2:3.
preferably, the water-sensitive control agent is one or more of ammonium chloride and organic amine polyoxyethylene ether.
Further preferably, the organic amine polyoxyethylene ether is one or more of polyetheramine D-230 or polyetheramine D-400.
Preferably, the water is fresh water and/or seawater.
The invention also provides a preparation method of the reservoir reconstruction liquid, which is prepared by uniformly mixing the raw materials with the formula amount.
After drilling, positively circulating the reservoir reconstruction liquid provided by the invention into a perforated pipe/screen pipe of an open hole section of a horizontal well, soaking and breaking gel, so that residual drilling liquid, the perforated pipe/screen pipe and a well wall mud cake of the open hole section can be completely broken gel and unblocked, and then positively extruding the reservoir reconstruction liquid to the stratum to finish unblocking of a near-wellbore zone of the horizontal well and deep reservoir reconstruction; after completion, the reservoir reconstruction fluid is positively circulated to the perforation section of the directional well, and then is extruded into the stratum, so that the blocking removal of the near-wellbore zone of the directional well and the deep reservoir reconstruction can be completed. Therefore, the reservoir reforming fluid can not only realize the production increase of the conventional development well and the conventional directional well of the conventional oil and gas reservoir, but also realize the production increase of the low-permeability oil and gas reservoir level adjustment well with higher difficulty, and is suitable for various oil and gas reservoir development wells. Therefore, the application of the reservoir reconstruction fluid in the oil and gas reservoir development well production increase shall be within the protection scope of the invention.
The invention has the following beneficial effects:
the reservoir reconstruction liquid is clear and transparent liquid, has excellent reservoir protection performance, and can enable the permeability recovery value of the low-permeability core to be more than 150% after the well is closed for 4 hours; the problem of secondary precipitation damage caused by long-time retention of conventional acid liquor when construction is waited for more than 62 hours is solved, namely, after the reservoir reconstruction liquid is soaked for 72 hours, the permeability recovery value of the low-permeability core is not only reduced, but also is raised to more than 600%, which indicates that the long-time retention of the reservoir reconstruction liquid can not cause secondary precipitation blockage to the reservoir, the effect of deep reconstruction of the reservoir is also achieved, and the purpose of improving the production and the yield of a hydrocarbon reservoir development well is achieved.
Detailed Description
The present invention is further illustrated below with reference to specific examples, which are not intended to limit the invention in any way. Unless specifically stated otherwise, the reagents, methods and apparatus employed in the present invention are those conventional in the art.
Reagents and materials used in the following examples are commercially available unless otherwise specified.
Example 1A reservoir modification fluid
1. 134mL of reservoir remodelling fluid:
20.0 parts of seepage promoter, 10.0 parts of double-effect reservoir reconstruction agent, 2.0 parts of water lock control agent, 2.0 parts of water sensitive control agent and 100 parts of fresh water;
the seepage promoter is prepared by uniformly mixing methanol, diethylene glycol monobutyl ether and propylene glycol, wherein the mass ratio of the methanol to the diethylene glycol monobutyl ether to the propylene glycol is 0.1:2.0:0.5;
the double-effect reservoir reconstruction agent is prepared by uniformly mixing formic acid, hydroxyethyl ethylenediamine triacetic acid and benzenesulfonic acid, wherein the mass ratio of the formic acid to the hydroxyethyl ethylenediamine triacetic acid to the benzenesulfonic acid is 2:5:3, a step of;
the water lock control agent is prepared by uniformly mixing ethanol and a nonionic fluorocarbon surfactant, wherein the mass ratio of the ethanol to the nonionic fluorocarbon surfactant is 0.1:2;
the water-sensitive control agent is polyetheramine D-230.
2. Preparation method of 134mL reservoir reconstruction liquid
Mixing the above materials.
Example 2A reservoir modification fluid
1. 145mL of reservoir remodelling fluid:
25.0 parts of seepage promoter, 15.0 parts of double-effect reservoir reconstruction agent, 3.0 parts of water lock control agent, 2.0 parts of water sensitive control agent and 100 parts of fresh water;
the seepage promoter is prepared by uniformly mixing methanol, diethylene glycol monobutyl ether and propylene glycol, wherein the mass ratio of the methanol to the diethylene glycol monobutyl ether to the propylene glycol is 0.2:3.0:0.8;
the double-effect reservoir reconstruction agent is prepared by uniformly mixing formic acid, hydroxyethyl ethylenediamine triacetic acid and benzenesulfonic acid, wherein the mass ratio of the formic acid to the hydroxyethyl ethylenediamine triacetic acid to the benzenesulfonic acid is 2.5:8.5:4, a step of;
the water lock control agent is prepared by uniformly mixing ethanol and a nonionic fluorocarbon surfactant, wherein the mass ratio of the ethanol to the nonionic fluorocarbon surfactant is 0.2:3, a step of;
the water-sensitive control agent is prepared by uniformly mixing ammonium chloride and polyetheramine D-400, wherein the mass ratio of the ammonium chloride to the polyetheramine D-400 is 1.5:3.
2. preparation method of 145mL reservoir reconstruction liquid
Mixing the above materials.
Example 3A reservoir modification fluid
1. 156.5mL of reservoir remodelling fluid:
30.0 parts of seepage promoter, 20.0 parts of double-effect reservoir reconstruction agent, 4.0 parts of water lock control agent, 2.5 parts of water sensitive control agent and 100 parts of fresh water;
the seepage promoter is prepared by uniformly mixing methanol, diethylene glycol monobutyl ether and propylene glycol, wherein the mass ratio of the methanol to the diethylene glycol monobutyl ether to the propylene glycol is 0.2:4.0:1.0;
the double-effect reservoir reconstruction agent is prepared by uniformly mixing formic acid, hydroxyethyl ethylenediamine triacetic acid and benzenesulfonic acid, wherein the mass ratio of the formic acid to the hydroxyethyl ethylenediamine triacetic acid to the benzenesulfonic acid is 3:10:5, a step of;
the water lock control agent is prepared by uniformly mixing ethanol and a nonionic fluorocarbon surfactant, wherein the mass ratio of the ethanol to the nonionic fluorocarbon surfactant is 0.2:3, a step of;
the water-sensitive control agent is prepared by uniformly mixing ammonium chloride, polyetheramine D-230 and polyetheramine D-400, wherein the mass ratio of the ammonium chloride to the vinyl cationic copolymer to the polyetheramine D-230 to the polyetheramine D-400 is 1.5:3:3.
2. 156.5mL reservoir reconstruction liquid preparation method
Mixing the above materials.
Comparative example 1
1. 109.5mL of components of the gel breaking solution
5 parts of a JPC breaker, 2 parts of a PF-HCS clay stabilizer, 2.5 parts of a PF-CA101 corrosion inhibitor and 100 parts of seawater.
2. 109.5mL gel breaking liquid preparation method
Mixing the above materials.
3. 105.5mL of invisible acid completion fluid
1 part of PF-HTA invisible acid chelating agent, 2 parts of PF-HCS clay stabilizer, 2.5 parts of PF-CA101 corrosion inhibitor and 100 parts of seawater.
4. Preparation method of 105.5mL invisible acid completion fluid
Mixing the above materials.
Test example 1
1. Preparing a solution
(1) Horizontal well drilling liquid polymer glue solution: seawater +2% PF-EZFLO +0.8% PF-EZVIS.
The preparation method comprises the following steps: 400mL of seawater is taken and slowly added with 3.20g (accurate to 0.01 g) of PF-EZVIS and 8.00g (accurate to 0.01 g) of PF-EZFLO in sequence at 11000r/min, and stirred for 20min for later use.
(2) Drilling liquid for horizontal well: seawater +2% PF-EZFLO +0.8% PF-EZVIS +5% PF-ezarb.
The preparation method comprises the following steps: 400mL of seawater is taken, 3.20g (accurate to 0.01 g) of PF-EZVIS and 8.00g (accurate to 0.01 g) of PF-EZFLO are slowly added in sequence at 11000r/min, stirring is carried out for 20min, 20.00g of PF-EZCARB (accurate to 0.01 g) is added, and stirring is carried out for 10min at 11000r/min for standby.
2. Glue solution breaking rate testing method
(1) Measuring viscosity phi 'of polymer glue solution of horizontal well drilling fluid at 25deg.C and 600r/min by using six-speed rotary viscometer according to GB/T16783.1' 600 ；
(2) Weighing 4 parts of 400mL of horizontal well drilling fluid polymer glue solution, respectively adding 40g, 60g and 80g of the double-effect reservoir reconstruction agents of examples 1-3 and 20g of the JPC breaker of comparative example 1, stirring at 10000rpm/min for 2min, pouring into a wide-mouth bottle and sealing;
(3) heating at 120deg.C for 5 hr, taking out, cooling, and measuring viscosity phi 'at 25deg.C and 600r/min according to GB/T16783.1' 600 ；
(4) The gel breaking rate was calculated as follows:
wherein:
φ 6 ' 00 -viscosity of the horizontal well drilling fluid polymer cement at 25 ℃, 600 r/min;
φ 6 " 00 -adding double-effect reservoir remodelling agent or JPC gel breaker to break the gel, and the viscosity of the horizontal well drilling fluid polymer glue solution at 25 ℃ and 600 r/min.
3. Mud cake clearance rate testing method
(1) Preparing a horizontal well drilling fluid, and adding 5% (w/v) drill cuttings to obtain a pressed mud cake for standby mud;
(2) soaking blank filter paper in water for 0.5min, taking out, draining, and weighing m 0 ；
(3) Pressing (time is 30 min) the standby slurry of the step (1) into a mud cake by using an API filtration method under the pressure of 0.7 MPa;
(4) taking out the pressed mud cake of (3), and weighing m 1 ；
(5) Putting the mud cakes into a surface dish filled with 100mL of reservoir reconstruction liquid of examples 1-3 and gel breaking liquid of comparative example 1 respectively, and soaking for 5h at 90 ℃;
(6) the mud cake was carefully clamped with forceps, drained and weighed m 2 ；
(7) The weight loss rate of the soaked mud cake is calculated as follows:
mud cake weight loss% = (m 1 －m 2 )×100/(m 1 －m 0 )。
4. Seepage velocity testing method
A1 mD Africa 12-1 oilfield reservoir natural rock core is selected indoors, and the experimental method refers to the reservoir sensitivity flow experimental evaluation method of the oil and gas industry standard SY/5358-2010 of the people's republic of China. The experimental procedure was as follows:
(1) washing oil from a natural rock core, drying, and measuring the porosity phi of the rock core for later use;
(2) preparing reservoir modification fluids of examples 1-3 (neither of which is added with a double-effect reservoir modifier) and a invisible acid completion fluid of comparative example 1 (no added with a PF-HTA invisible acid chelating agent) respectively;
(3) evacuating the natural rock core to saturate any one of the prepared experimental fluids (2);
(4) measuring the seepage flow of 30min under 1.0MPa on a core tester, and calculating the seepage speed according to the following formula;
(5) re-washing oil from the natural rock core, and drying for later use;
(6) vacuumizing the natural rock core to saturate the rest of the prepared experimental fluid (2);
(7) measuring seepage flow at 1.0MPa for 30min on a core tester, and calculating seepage speed;
(8) repeating the steps (5) to (7), and completing the seepage measurement speed experiment of the remaining two experimental fluids (2).
Wherein:
v-seepage velocity, m/d;
q-seepage flow, mL;
30-percolation time, min;
a-core cross-sectional area, cm 2 ；
Phi-core porosity,%.
5. Method for testing corrosion rate of rock fragments of reservoir
The test refers to an acid liquor selection evaluation method in the oil and gas industry standard SY/5358-2010 reservoir sensitivity flow experiment evaluation method of the people's republic of China, and specifically comprises the following steps:
(1) crushing and sieving the rock fragments of the Africa 12-1 oil field reservoir until the amount of the rock fragments passing through the sieve is more than 80% of the amount, uniformly mixing the rock fragments passing through the sieve, and baking the rock fragments to constant weight at 105 ℃ for later use;
(2) the mass m of reservoir cuttings was weighed on an electronic balance in a ratio of 1.0g reservoir cuttings per 20mL of acid (reservoir retrofit fluid of examples 1-3 and invisible acid completion fluid of comparative example 1) 0 Weighing 4 parts, placing into 50mL Erlenmeyer flasks with cover, respectively, and simultaneously weighing filter paper and table baked to constant weight at 80deg.CQuality m of dish Paper sheet And m Dish ；
(3) The prepared reservoir reconstruction fluids of examples 1-3 and the invisible acid completion fluid of comparative example 1 are respectively added into an Erlenmeyer flask of (2), reservoir cuttings and acid liquor are mixed, and the mixture is reacted for 4 hours at a constant temperature of 90 ℃;
(4) filtering the reactant by using a weighed filter paper, washing the separated filter residue by using a NaOH solution with the concentration of 0.1% (w/v) until the filter residue is nearly neutral, and washing the filter residue by using distilled water until the filter residue is neutral;
(5) placing the filter residue together with filter paper in a weighed surface dish, baking at 80deg.C to constant weight, and subtracting m from the total weight Paper sheet And m Dish After that, the quality m of the filter residue is obtained 1 ；
(6) Calculating corrosion rate R= [ (m) of reservoir cuttings 0 -m 1 )/m 0 ]×100％。
6. Core permeability recovery value test method after serial fluid pollution
The experimental method is implemented according to the oil and gas industry standard SY/T6540-2002 drilling fluid completion fluid damage reservoir indoor evaluation method. The experimental procedure was as follows:
(1) washing oil from a Africa 12-1 oilfield natural rock core, and drying;
(2) vacuumizing the natural rock core to saturate 3% (w/v) KCl solution, and then standing for more than 40 hours for later use;
(3) measuring the original permeability K1 of the natural rock core by kerosene at 90 ℃ in the forward direction;
(4) example series fluid contamination: reversely using horizontal well drilling fluid to pollute the rock core for 125min at the temperature of 130 ℃ under the pressure of 3.5MPa on a dynamic pollution instrument; then, reversely extruding the reservoir reconstruction liquids of 5PV examples 1-3 respectively on a static pollution instrument at 130 ℃ to continuously pollute the rock core, and closing the well for 4 hours or 72 hours; reversely squeezing 3% (w/v) KCl solution of 2PV, and closing the well for 6 hours;
(5) comparative example series fluid contamination: reversely using horizontal well drilling fluid to pollute the rock core for 125min at the temperature of 130 ℃ under the pressure of 3.5MPa on a dynamic pollution instrument; then, reversely extruding a JPC gel breaking liquid with the concentration of 5PV on a static pollution instrument at 130 ℃ to continuously pollute the rock core, and closing the well for 4 hours; then reversely extruding 2PV invisible acid completion fluid, closing the well for 6 hours;
(6) the permeability K2 after the serial fluid pollution is measured by kerosene at 90 ℃ in the forward direction, and the permeability recovery value K2/K1 is calculated.
7. The measurement results are shown in Table 1.
TABLE 1
It can be seen that the mud cake clearance rate, the seepage velocity, the reservoir cuttings erosion rate and the core permeability recovery values of examples 1-3 are all significantly higher than those of comparative example 1, which indicates that the reservoir modification liquid of the invention has good gel breaking and blocking removing performance and reservoir modification capability.
Among them, the gel breaking rate, mud cake removal rate, and reservoir cuttings erosion rate of comparative examples 1 to 3 and comparative example 1 were found: the double-effect reservoir remodelling agent not only can acidolyze a residual drilling fluid system (the gel breaking rate of a gel solution reaches more than 95 percent), a perforated pipe/screen pipe and a well wall retention mud cake (the mud cake clearance rate is improved by more than 20 percent) at an open hole section, but also can invade polymer macromolecules in reservoir filtrate, dissolve a skeleton particle temporary plugging agent of the polymer macromolecules, and remove inorganic scale generated in a near-wellbore zone, thereby thoroughly relieving solid phase blockage and liquid phase incompatibility caused by a well entering fluid in the earlier stage; the double-effect reservoir reconstruction agent has certain corrosion on reservoir cement, can moderately erode reservoir minerals, plays a role in hole expansion and reaming, and has good double-effect characteristics of blocking removal and reservoir reconstruction.
The results of the seepage velocity of comparative examples 1 to 3 and comparative example 1 show that: the seepage promoter of the invention not only can obviously improve the wettability of a reservoir so as to lead the reservoir to be strong in hydrophilicity, but also can obviously reduce the viscosity of crude oil, is beneficial to quickly reducing the flow viscosity of crude oil with increased viscosity caused by degassing or deposition in a near-wellbore zone, and further ensures that the oil flow quickly occupies a central pore canal and the seepage capability is obviously improved. In addition, the seepage promoter can also improve the acid liquor seepage speed of the hypotonic ultralow permeability reservoir by about 1.5 times, solves the difficult problem of low-hole hypotonic acid liquor extrusion injection, accelerates the seepage propelling speed of the low-hole hypotonic acid liquor, and is beneficial to realizing deep acidification of reservoir reconstruction liquid. The seepage-promoting capability of the seepage-promoting agent is bidirectional, the capability of acid liquor entering a reservoir is improved in the early stage, and the reservoir is beneficial to realizing pressure reduction and flowback of oil flow after transformation, so that the seepage-promoting agent has double functions.
The recovery values of core permeability after the series of fluids of comparative examples 1-3 and comparative example 1 are as follows: the reservoir reconstruction liquid has excellent reservoir protection performance, and the permeability recovery value of the low-permeability core can reach more than 150% after the well is closed for 4 hours; the problem of secondary precipitation damage caused by long-time retention of conventional acid liquor when construction is waited for more than 62 hours is solved, namely, after the reservoir reconstruction liquid is soaked for 72 hours, the permeability recovery value of the low-permeability core is not only reduced, but also is raised to more than 600%, which indicates that the long-time retention of the reservoir reconstruction liquid can not cause secondary precipitation blockage to the reservoir, the effect of deep reconstruction of the reservoir is also achieved, and the purpose of improving the production and the yield of a hydrocarbon reservoir development well is achieved.
The experimental result shows that the reservoir reconstruction liquid can be used for increasing the yield of the low-permeability reservoir horizontal adjustment well, and can be naturally used for increasing the yield of conventional development wells and conventional directional wells of conventional reservoirs with obviously reduced difficulty, so that the reservoir reconstruction liquid is suitable for various types of reservoir development wells.
The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present invention should be made in the equivalent manner, and the embodiments are included in the protection scope of the present invention.
Claims (10)
1. The reservoir reforming fluid is characterized by comprising the following components in parts by weight: 20.0 to 30.0 parts of seepage promoter, 10.0 to 20.0 parts of double-effect reservoir reconstruction agent and 100 parts of water;
wherein the seepage promoter comprises methanol, diethylene glycol monobutyl ether and propylene glycol; the double-effect reservoir reformation agent comprises formic acid, hydroxyethyl ethylenediamine triacetic acid and benzenesulfonic acid.
2. The reservoir retrofit liquid of claim 1, further comprising a water lock control agent and a water sensitive control agent.
3. The reservoir reformation liquid according to claim 2, wherein the water lock preventing and controlling agent is 2.0 to 4.0 parts by weight; the weight portion of the water sensitive preventing and controlling agent is 2.0 to 2.5 portions.
4. The reservoir reconstruction fluid according to claim 1, wherein the mass ratio of methanol, diethylene glycol monobutyl ether and propylene glycol in the seepage promoter is 0.1-0.2: 2.0 to 4.0:0.5 to 1.0.
5. The reservoir reconstruction fluid according to claim 1, wherein in the double-effect reservoir reconstruction agent, the mass ratio of formic acid, hydroxyethyl ethylenediamine triacetic acid and benzenesulfonic acid is 2-3: 5-10: 3 to 5.
6. The reservoir retrofit fluid of claim 2, wherein the water lock control agent comprises ethanol, a nonionic fluorocarbon surfactant.
7. The reservoir reformation liquid according to claim 6, wherein in the water lock preventive agent, the mass ratio of the ethanol to the nonionic fluorocarbon surfactant is 0.1 to 0.2:2 to 3.
8. The reservoir reformation liquid according to claim 2, wherein the water-sensitive control agent is one or more of ammonium chloride and organic amine polyoxyethylene ether.
9. The method for preparing the reservoir reconstruction fluid according to any one of claims 1 to 8, which is characterized in that the reservoir reconstruction fluid is prepared by uniformly mixing the raw materials with the formula amount.
10. Use of a reservoir inversion fluid according to any one of claims 1 to 8 in stimulation of a reservoir development well.
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