CN113308230A - Temporary plugging type low-free hydraulic well fluid and preparation method thereof - Google Patents
Temporary plugging type low-free hydraulic well fluid and preparation method thereof Download PDFInfo
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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
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- 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
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
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- 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
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
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- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/10—Nanoparticle-containing well treatment fluids
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- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/12—Swell inhibition, i.e. using additives to drilling or well treatment fluids for inhibiting clay or shale swelling or disintegrating
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Abstract
The invention provides a temporary plugging type low-free hydraulic well killing fluid, and belongs to the technical field of well killing fluid preparation. The well killing fluid comprises the following raw materials in parts by weight: 5-50 parts of a density regulator; 0.05-0.15 part of thickening agent; 0.1-1 part of a modifier; 0.1-1 part of water-absorbing polymer particles. The water-absorbing polymer particles are added into the well killing fluid, a molecular chain of the water-absorbing polymer particles has a large amount of hydrophilic groups, so that the water can be absorbed by the water, a formed cross-linked network structure has swelling and insolubility performances, low filtration loss and the performance of effectively inhibiting clay expansion, and meanwhile, a formed temporary plugging layer has extremely high pressure bearing capacity, so that the well killing fluid can be prevented from leaking and a reservoir layer can be effectively protected.
Description
Technical Field
The invention relates to the technical field of preparation of well killing fluid, in particular to temporary plugging type low-free hydraulic well killing fluid and a preparation method thereof.
Background
In operations such as killing well, workover fluid performance of oil and gas well, the harmfulness degree of oil and gas well and the height of output are directly influenced to the good and bad of killing well, workover fluid performance. The conventional water-based workover fluid is easy to drain back, but has large filtration loss and large damage to the stratum, particularly a well with high clay content has serious water lock damage, and after workover operation of a plurality of oil and gas wells is finished, the yield is greatly reduced and is difficult to recover to the original level.
For the operation of low-pressure gas wells in some domestic gas fields, a foam well killing fluid system, a solid-phase temporary plugging well killing fluid system, non-well killing operation and the like are mainly adopted, and various methods have certain advantages and disadvantages: the foam well control fluid system has small water loss and low damage to a reservoir, but has complex process, short stabilization period, large environmental pollution and difficult control of density; the solid-phase temporary plugging well killing fluid system has low requirement on subsequent working fluid, but must be acid-washed before production, and has damage to an oil-gas layer.
Therefore, the problem to be solved at present is to prepare the well killing fluid which has adjustable density, convenient configuration, no clay expansion, certain bearing capacity and low damage to the stratum.
Disclosure of Invention
In view of the above, the present invention provides a temporary plugging type low free hydraulic fluid. The temporary plugging type low-free hydraulic fluid has low filtration loss and the property of effectively inhibiting clay expansion, and meanwhile, a formed temporary plugging layer has extremely high pressure bearing capacity, can prevent the leakage of the hydraulic fluid and effectively protects a reservoir stratum.
The temporary plugging type low-free hydraulic well fluid is prepared from the following raw materials in percentage by mass:
5 to 50 percent of density regulator
0.05 to 0.15 percent of thickening agent
0.1 to 1 percent of modifier
0.1 to 1% of water-absorbent polymer particles,
the balance of water.
Preferably, the density regulator is NaCl, KCl or CaCl2One or more of pyrophosphate, carboxylate, chromate, silicate;
preferably, the thickening agent is one or more of hydroxypropyl guar gum, carboxymethyl cellulose and anionic polyacrylamide;
preferably, the modifier is one or more of gas-phase hydrophilic nano-silica, montmorillonite, activated clay, diatomite and sepiolite powder.
Preferably, the water-absorbent polymer particles are prepared by mixing water-absorbent polymer particles (Beijing Cuo Co., model: SF-1) having a particle size of 1mm and water-absorbent polymer particles (Beijing Cuo Co., model: SF-2) having a particle size of 3mm in a mass ratio of 1: 2, mixing the components.
The preparation method of the temporary plugging type low-free hydraulic well fluid comprises the following steps:
(1) adding a density regulator into 45-65% of clear water according to a proportion to obtain a density regulator solution;
(2) adding the thickening agent and the modifying agent into 25-40% of clear water according to a proportion, and stirring for 15-20 minutes until the mixture is uniform;
(3) mixing the solutions in the step (1) and the step (2) in proportion, and uniformly stirring to obtain a mixed solution;
(4) adding water-absorbing polymer particles into the mixed solution in the step (3), adding the balance of clear water, stirring for 20min until the liquid is uniform, standing, and swelling for 40-80 min to obtain the temporary plugging type low-free hydraulic well fluid, wherein the density of the temporary plugging type low-free hydraulic well fluid is 1.0-1.5 g/cm3。
The invention firstly prepares two different solutions and then mixes the two solutions, because the dissolution speed is slower because the density regulator is added and other components are added, and the dissolution speed can be accelerated by respectively preparing the density regulator solution, the thickening agent solution and the modifier solution and then mixing the two solutions.
The conventional leak-stopping type well killing fluid has poor well killing effect due to the fact that the pressure bearing capacity of the conventional leak-stopping type well killing fluid cannot meet the requirement, water-absorbing polymer particles are added into the well killing fluid system, a hydrophilic three-dimensional space network structure is formed by the polymer in the cross-linking polymerization process, the water absorption capacity of the polymer is related to the chemical structure of the polymer and the distribution state of polar groups in an aggregation state, a molecular chain has a large number of hydrophilic groups (carboxyl and carboxyl ions), and the polymer can be in water cooperation with water to expand the network chain when contacting with the water, meanwhile, the hydrophilic ion concentration in the cross-linked molecules is higher, so that osmotic pressure is generated inside and outside the network chains to promote water molecules to permeate into the macromolecules, in addition, the same-polarity groups on the net chains repel each other, so that the net chains are further expanded, and through the action mechanism among the molecules, the cross-linked polymer can absorb a large amount of water, so that the formed cross-linked net structure has swelling and insolubility properties.
The temporary plugging type low-free hydraulic well killing fluid prepared by the invention is suitable for well killing operation of an oil-gas well at the temperature within 90 ℃, has low filtration loss and the performance of effectively inhibiting clay expansion, and simultaneously, a temporary plugging layer formed by the temporary plugging type low-free hydraulic well killing fluid has extremely high pressure bearing capacity, can prevent leakage of the well killing fluid and effectively protects a reservoir stratum. The density of the product is 1.0g/cm3～1.5g/cm3The pressure bearing capacity is adjustable and is less than or equal to 21MPa, the gas measurement reverse breakthrough pressure is less than 0.6MPa, the free water is less than 10 percent, the surface tension of the kill fluid is less than 30mN/m, the corrosion rate to the oil pipe at 80 ℃ is less than 0.3mm/a, and the corrosion to the oil pipe is low.
Compared with the prior art, the invention has the following beneficial effects:
the temporary plugging type low-free hydraulic well fluid has the density of 1.0g/cm3～1.5g/cm3The adjustable structure can be adjusted, and flexible adjustment under various construction requirements can be met; the pressure bearing capacity is more than or equal to 21MPa, the high pressure bearing capacity is realized, the construction success rate is high, and the well killing operation of a medium-deep well can be met; the gas measurement reverse breakthrough pressure is less than 0.6MPa, the damage to the stratum is small, after the operation is finished, the gas measurement reverse breakthrough pressure is small, the yield recovery speed of the gas well is high, and the damage to the operation of the gas well is small; the free water is less than 10 percent, the leakage amount is small, and the damage to the stratum caused by the liquid leakage is small; the surface tension of the well killing fluid is less than 30mN/m, and no water lock damage is generated; the corrosion rate to the oil pipe at 80 ℃ is less than 0.3mm/a, and the corrosion to the oil pipe is low.
Detailed Description
The present invention will be further described with reference to the following examples.
Example 1
The temporary plugging type low-free hydraulic well fluid is prepared from the following raw materials in percentage by mass:
15 percent of density regulator,
0.1 percent of thickening agent,
0.1 percent of modifier,
0.5 percent of water-absorbing polymer particles,
the balance of water.
The preparation method comprises the following steps:
(1) 50mL of clear water is contained in a beaker A, 15g of density regulator (a mixture of potassium chloride and sodium acetate in a mass ratio of 1: 14) is added, and the mixture is stirred for 15min until the mixture is completely dissolved to obtain a density regulator solution;
(2) 30mL of clear water is contained in the beaker B, 0.1g of thickener carboxymethyl cellulose and 0.1g of modifier montmorillonite are added, and the mixture is stirred for 20 minutes until the mixture is uniform;
(3) mixing the solutions in the beakers A and B, and uniformly stirring to obtain a mixed solution;
(4) adding 0.3g of water-absorbent polymer particles with the particle size of 1mm and 0.2g of water-absorbent polymer particles with the particle size of 3mm into the mixed solution in the step (3), adding the rest 4.3mL of clear water, stirring for 20min until the liquid is uniform, standing, and swelling for 40 min to obtain the temporary plugging type low-free hydraulic well fluid
The density of the temporary plugging type low-free hydraulic well fluid is 1.1g/cm3The breakthrough pressure is less than or equal to 4MPa, and the reverse breakthrough pressure of gas measurement is less than 0.6 MPa.
Example 2
The temporary plugging type low-free hydraulic well fluid is prepared from the following raw materials in percentage by mass:
23 percent of density regulator
0.15 percent of thickening agent
0.1 percent of modifier
0.55 percent of water-absorbing polymer particles,
the balance of water.
The preparation method comprises the following steps:
(1) 40mL of clear water is contained in a beaker A, 23g of density regulator (a mixture of potassium chloride and sodium acetate with the mass ratio of 2: 21) is added, and the mixture is stirred for 15min until the mixture is completely dissolved to obtain a density regulator solution;
(2) 30mL of clear water is contained in a beaker B, 0.15g of thickening agent hydroxypropyl guar gum and 0.1g of modifier active clay are added, and the mixture is stirred for 20 minutes until the mixture is uniform;
(3) mixing the solutions in the beakers A and B, and uniformly stirring to obtain a mixed solution;
(4) and (3) adding 0.3g of water-absorbent polymer particles with the particle size of 1mm and 0.25g of water-absorbent polymer particles with the particle size of 3mm into the mixed solution in the step (3), adding the rest 6.2mL of clear water, stirring for 20min until the liquid is uniform, standing, and swelling for 40 min to obtain the temporary plugging type low-free hydraulic well fluid.
The density of the temporary plugging type low-free hydraulic well fluid is 1.15g/cm3The breakthrough pressure is less than or equal to 4MPa, and the reverse breakthrough pressure of gas measurement is less than 0.6 MPa.
Example 3
The temporary plugging type low-free hydraulic well fluid is prepared from the following raw materials in percentage by mass:
density regulator 29%
0.1 percent of thickening agent
0.1 percent of modifier
0.65 percent of water-absorbing polymer particles,
the balance of water.
The preparation method comprises the following steps:
(1) putting 40mL of clear water in a beaker A, adding 29g of sodium formate as a density regulator, and stirring for 15min until the sodium formate is completely dissolved to obtain a density regulator solution;
(2) 25mL of clear water is contained in the beaker B, 0.1g of thickening agent anionic polyacrylamide and 0.1g of modifier montmorillonite are added, and the mixture is stirred for 20 minutes until the mixture is uniform;
(3) mixing the solutions in the beakers A and B, and uniformly stirring to obtain a mixed solution;
(4) and (3) adding 0.3g of water-absorbent polymer particles with the particle size of 1mm and 0.35g of water-absorbent polymer particles with the particle size of 3mm into the mixed solution in the step (3), adding the rest 5.15mL of clear water, stirring for 20min until the liquid is uniform, standing, and swelling for 60 min to obtain the temporary plugging type low-free hydraulic well fluid.
The density of the temporary plugging type low-free hydraulic well fluid is 1.20g/cm3The breakthrough pressure is less than or equal to 6MPa, and the reverse breakthrough pressure of gas measurement is less than 0.6 MPa.
Example 4
The temporary plugging type low-free hydraulic well fluid is prepared from the following raw materials in percentage by mass:
density regulator 37%
0.1 percent of thickening agent
0.1 percent of modifier
0.7 percent of water-absorbing polymer particles,
the balance of water.
The preparation method comprises the following steps:
(1) 35mL of clear water is contained in the beaker A, 37g of sodium formate as a density regulator is added, and the mixture is stirred for 15min until the sodium formate is completely dissolved to obtain a density regulator solution;
(2) 20mL of clear water is contained in a beaker B, 0.1g of thickening agent hydroxypropyl guar gum and 0.1g of modifying agent fumed nano silicon dioxide are added, and the mixture is stirred for 20 minutes until the mixture is uniform;
(3) mixing the solutions in the beakers A and B, and uniformly stirring to obtain a mixed solution;
(4) and (3) adding 0.3g of water-absorbent polymer particles with the particle size of 1mm and 0.4g of water-absorbent polymer particles with the particle size of 3mm into the mixed solution in the step (3), adding the rest 7.1mL of clear water, stirring for 20min until the liquid is uniform, standing, and swelling for 70 min to obtain the temporary plugging type low-free hydraulic well fluid.
The density of the temporary plugging type low-free hydraulic well fluid is 1.25g/cm3The breakthrough pressure is less than or equal to 8MPa, and the reverse breakthrough pressure of gas measurement is less than 0.6 MPa.
Example 5
The temporary plugging type low-free hydraulic well fluid is prepared from the following raw materials in percentage by mass:
density regulator 37%
0.1 percent of thickening agent
0.3 percent of modifier
0.8 percent of water-absorbing polymer particles,
the balance of water.
The preparation method comprises the following steps:
(1) 35mL of clear water is contained in the beaker A, 37g of sodium formate as a density regulator is added, and the mixture is stirred for 15min until the sodium formate is completely dissolved to obtain a density regulator solution;
(2) 20mL of clear water is contained in a beaker B, 0.1g of thickening agent hydroxypropyl guar gum and 0.3g of modifier (the mixture of the fumed silica and the montmorillonite in a mass ratio of 2: 1) are added, and the mixture is stirred for 20 minutes until the mixture is uniform;
(3) mixing the solutions in the beakers A and B, and uniformly stirring to obtain a mixed solution;
(4) and (3) adding 0.3g of water-absorbent polymer particles with the particle size of 1mm and 0.5g of water-absorbent polymer particles with the particle size of 3mm into the mixed solution in the step (3), adding the rest 7.1mL of clear water, stirring for 20min until the liquid is uniform, standing, and swelling for 80 min to obtain the temporary plugging type low-free hydraulic well fluid.
The density of the temporary plugging type low-free hydraulic well fluid is 1.25g/cm3The breakthrough pressure is less than or equal to 15MPa, and the reverse breakthrough pressure of gas measurement is less than 0.6 MPa.
Example 6
The temporary plugging type low-free hydraulic well fluid is prepared from the following raw materials in percentage by mass:
density regulator 37%
0.1 percent of thickening agent
0.3 percent of modifier
0.9 percent of water-absorbing polymer particles,
the balance of water.
The preparation method comprises the following steps:
(1) 35mL of clear water is contained in the beaker A, 37g of sodium formate as a density regulator is added, and the mixture is stirred for 15min until the sodium formate is completely dissolved to obtain a density regulator solution;
(2) 20mL of clear water is contained in a beaker B, 0.1g of thickening agent hydroxypropyl guar gum and 0.3g of modifying agent fumed nano silicon dioxide are added, and the mixture is stirred for 20 minutes until the mixture is uniform;
(3) mixing the solutions in the beakers A and B, and uniformly stirring to obtain a mixed solution;
(4) and (3) adding 0.3g of water-absorbent polymer particles with the particle size of 1mm and 0.6g of water-absorbent polymer particles with the particle size of 3mm into the mixed solution in the step (3), adding the rest 7.1mL of clear water, stirring for 20min until the liquid is uniform, standing, and swelling for 80 min to obtain the temporary plugging type low-free hydraulic well fluid.
The temporary plugging type low free waterThe density of the well killing fluid is 1.25g/cm3The breakthrough pressure is less than or equal to 21MPa, and the reverse breakthrough pressure of gas measurement is less than 0.6 MPa.
The water loss rates of the temporary plugging type low free hydraulic well fluids of examples 1-6 under different pressures are shown in table 1:
TABLE 1
The corrosion rate of the temporary plugging type low-free hydraulic well fluid of the embodiments 1-6 on the oil pipe at different temperatures is shown in the table 2:
TABLE 2
The surface tension of the temporary plugging type low free hydraulic fluids of examples 1-6 are shown in table 3:
TABLE 3
| Examples | Density (g/cm) of well killing fluid3) | Surface second tension mN/m |
| Example 1 | 1.00 | 26.0 |
| Example 2 | 1.15 | 28.5 |
| Example 3 | 1.20 | 29.3 |
| Example 4 | 1.25 | 29.7 |
| Example 5 | 1.25 | 29.6 |
| Example 6 | 1.25 | 29.8 |
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (6)
1. The temporary plugging type low-free hydraulic fluid is characterized by comprising the following raw materials in percentage by mass:
5 to 50 percent of density regulator
0.05 to 0.15 percent of thickening agent
0.1 to 1 percent of modifier
0.1 to 1% of water-absorbent polymer particles,
the balance of water.
2. The temporary plugging type low-free hydraulic well control fluid according to claim 1, wherein the density regulator is NaCl, KCl, CaCl2Pyrophosphate, carboxylate, chromate, silicate.
3. The temporary plugging low-free hydraulic well control fluid according to claim 1, wherein the thickener is one or more of hydroxypropyl guar, carboxymethyl cellulose and anionic polyacrylamide.
4. The temporary plugging type low-free hydraulic well fluid according to claim 1, wherein the modifier is one or more of gas-phase hydrophilic nano-silica, montmorillonite, activated clay, diatomite and sepiolite powder.
5. The temporary plugging type low-free hydraulic well fluid according to claim 1, wherein the water-absorbing polymer particles are prepared by mixing water-absorbing polymer particles with the particle size of 1mm and water-absorbing polymer particles with the particle size of 3mm according to a mass ratio of 1: 2, mixing the components.
6. The preparation method of the temporary plugging type low-free hydraulic well fluid according to any one of claims 1 to 5, characterized by comprising the following steps:
(1) adding a density regulator into 45-65% of clear water according to a proportion to obtain a density regulator solution;
(2) adding the thickening agent and the modifying agent into 25-40% of clear water according to a proportion, and stirring for 15-20 minutes until the mixture is uniform;
(3) mixing the solutions in the step (1) and the step (2) in proportion, and uniformly stirring to obtain a mixed solution;
(4) adding water-absorbing polymer particles into the mixed solution in the step (3), adding the balance of clear water, stirring for 20min until the liquid is uniform, standing, and swelling for 40-80 min to obtain the temporary plugging type low-free hydraulic well fluid, wherein the density of the temporary plugging type low-free hydraulic well fluid is 1.0-1.5 g/cm3。
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| CN110846014A (en) * | 2019-12-04 | 2020-02-28 | 中国石油集团川庆钻探工程有限公司工程技术研究院 | Low-damage well killing fluid for low-pressure gas well and preparation method |
| CN111205839A (en) * | 2020-01-17 | 2020-05-29 | 中国石油天然气股份有限公司 | Elastic gel temporary plugging well killing fluid used in combination with gas well and construction process |
| CN111410943A (en) * | 2020-03-16 | 2020-07-14 | 中国石油天然气股份有限公司 | Composite gel well killing rubber plug capable of being rapidly gelatinized at high temperature and being weighted and preparation method thereof |
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