CN115322762A - Shear-recoverable drilling plug fluid and preparation method thereof - Google Patents
Shear-recoverable drilling plug fluid and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a shear-recoverable drilling plug liquid and a preparation method thereof, which are used for drilling a bridge plug after horizontal well fracturing by matching with a continuous oil pipe and comprise the following components in parts by mass by taking water as a dispersion medium: 1.2-1.5 parts of viscoelastic surfactant, 0.1-0.3 part of bactericide, 1.2-1.5 parts of regulator and 96.7-97.5 parts of water. The shear recoverable drilling plug fluid has certain viscosity, good resistance reduction performance, good salt resistance and good shear recovery performance, and therefore has good application in carrying drilling cuttings in an annulus, reducing injection pump pressure, reducing oil-connecting stuck drilling accidents and improving the reuse rate of the drilling plug fluid. The drilling plug liquid system main agent is single and simple to prepare, and can meet the requirement of online real-time addition.
Description
Technical Field
The invention relates to the technical field of oil development downhole operation, in particular to a shearing recoverable drilling plug fluid and a preparation method thereof.
Background
The long horizontal well and multi-section fracturing technology is the main technology for developing shale oil gas at present. In the large-scale reservoir transformation of shale oil and gas, the most common process for realizing the long horizontal well and multi-section fracturing technology is drillable composite bridge plug staged fracturing. After fracturing flowback, a bridge plug needs to be drilled and removed to open a well hole channel, so that the yield of test gas is improved. In recent years, the technology of drilling and grinding the bridge plug of the continuous oil pipe is rapidly developed, the operation well is greatly increased year by year, and the method plays an important role in the development of shale gas, dense oil and conventional oil gas. But the production and technical problems of low construction efficiency, liquid preparation after annular space return, low liquid efficiency, poor chip carrying effect, high drilling sticking accident rate and the like generally exist. The main reason is that in the process of continuous shearing and recycling, the liquid used for drilling and plugging is unstable in performance, poor in water quality, increased in friction resistance and increased in pumping pressure, so that the coiled tubing and downhole tools are greatly damaged, and accidents such as drilling, drilling blockage, tool falling and the like are easily caused. Therefore, the drilling plug fluid has certain viscosity and drag reduction performance, and has certain requirements on salt resistance and shear recovery performance.
Disclosure of Invention
The invention aims to solve the technical problem of providing a shear-recoverable drilling fluid and a preparation method thereof, wherein the shear-recoverable drilling fluid has certain viscosity, good resistance-reducing performance, good salt resistance and good shear recovery performance.
The technical scheme adopted by the invention for solving the technical problems is as follows: the shear-recoverable drilling plug liquid is used for drilling a bridge plug after fracturing of a horizontal well by matching with a continuous oil pipe, and comprises the following components in parts by mass with water as a dispersion medium: 1.2-1.5 parts of viscoelastic surfactant, 0.1-0.3 part of bactericide, 1.2-1.5 parts of regulator and 96.7-97.5 parts of water.
According to the scheme, the viscoelastic surfactant is any one or a mixture of a betaine amphoteric surfactant, a nonionic surfactant and a Gemini type surfactant.
According to the scheme, the bactericide is any one or a mixture of more of formaldehyde, acetaldehyde, urea-formaldehyde, glyoxal, acrolein, phenol, biphenol, hydrolyzed plant phenol, sodium polyphosphate, sodium chloride and copper chloride.
According to the scheme, the regulator is any one or any mixture of maleic acid, sodium p-toluenesulfonate, salicylic acid, ethanol, sodium chloride and isopropanol.
The invention also provides a preparation method of the shear recoverable drilling fluid, which comprises the following steps:
(1) Weighing clear water, adding a regulator in proportion, and uniformly stirring at 1000 rpm to obtain a mixed transparent solution A;
(2) Adding a viscoelastic surfactant into the solution A under the high-speed stirring of 1500 rpm, and reacting for 10min to obtain a solution B;
(3) And after 10min, adding the bactericide into the solution B, and stirring for 2min at the speed of 100-200 rpm to finally obtain the shear-recoverable drilling plug liquid.
The mechanism of the invention is as follows:
the viscoelastic surfactant contains both hydrophilic groups and hydrophobic groups in its molecule, and when the concentration of the surfactant is increased to a certain level, the degree of aggregation of the surfactant molecules at the air-water interface is saturated, in which case the hydrophobic groups are aggregated together in order to escape the aqueous phase, forming disk-like, spherical or rod-like aggregates having the hydrophobic groups facing inward and the hydrophilic groups facing outward. At the same time, aggregation of the micelle-like substances can be promoted in the presence of the modifier or the micelle promoter. The counter ions can weaken the electric repulsion between hydrophilic groups of the surfactant, one bond force exists between the counter ions and the hydrophilic groups, the counter ions form a hydration layer around the counter ions and the contact area between the hydrophobic groups and the water phase is reduced as much as possible, and therefore the viscoelasticity of the aqueous solution of the surfactant is greatly improved.
The shear recoverable drilling plug liquid and the preparation method thereof have the following beneficial effects:
1. the shear-recoverable drilling plug liquid system has good effects of carrying drill cuttings in an annular space, cleaning a shaft and reducing drag, and has no damage to a reservoir stratum, so that the drilling blockage accident of the continuous oil pipe is reduced.
2. The shear recoverable drilling plug liquid system has the characteristics of simple composition, capability of meeting the requirement of on-site online real-time addition, reduction of pre-mixing links, reduction of liquid preparation cost, simplicity in operation, cleanness, environmental friendliness, no toxicity and the like.
3. The shear recoverable drilling plug liquid system still has the viscosity retention rate of more than 80 percent after being sheared at high temperature for multiple times at high speed.
4. The shear recoverable drilling plug fluid system can meet the requirement of on-site flow-back water preparation, can recover the viscosity after shearing and standing, and can realize repeated cyclic utilization.
Detailed Description
For a more clear understanding of the technical features, objects, and effects of the present invention, specific embodiments of the present invention will now be described in detail.
Example 1
A preparation method of a shear recoverable drilling and plugging liquid comprises the steps of measuring 97.5 parts by weight of clear water, adding 1.2 parts by weight of a regulator into the clear water, and uniformly stirring at 1000 rpm to obtain a mixed transparent solution A; adding 1.2 parts of viscoelastic surfactant into the solution A under the high-speed stirring of 1500 rpm, and reacting for 10min to obtain solution B; and after 10min, adding 0.1 part of bactericide into the solution B, and stirring for 2min at the speed of 100-200 r/min to finally obtain the shear-recoverable drilling plug liquid. The viscosity of the shear recoverable drilling plug liquid system is at 60 ℃ for 170s -1 Lower 18 mPa.s; after 2h of high-speed shearing, the viscosity retention rate is 87.5 percent, which is improved by 28 percent compared with the viscosity retention rate of the conventional drilling plug fluid; after standing for 24h, the viscosity is recovered98.3 percent of the original content; the drag reduction rate is improved by 22.8 percent compared with the conventional drilling plug liquid, and the sand carrying capacity is improved by 27 percent.
Example 2
A preparation method of a shear recoverable drilling fluid comprises the steps of measuring 97.2 parts of clear water by mass, adding 1.5 parts of regulator by mass, and uniformly stirring at 1000 rpm to obtain a mixed transparent solution A; adding 1.2 parts of viscoelastic surfactant into the solution A under the high-speed stirring of 1500 rpm, and reacting for 10min to obtain solution B; and after 10min, adding 0.1 part of bactericide into the solution B, and stirring at 100-200 rpm for 2min to finally obtain the shear recoverable drilling plug liquid. The viscosity of the shear recoverable drilling plug liquid system is at 90 ℃ for 170s -1 At a lower value of 16 mPas; after 2h of high-speed shearing, the viscosity retention rate is 84.4 percent and is improved by 24.9 percent compared with the viscosity retention rate of the conventional drilling plug fluid; after standing for 24 hours, the viscosity is recovered to 98.8 percent of the original viscosity; the drag reduction rate is improved by 28.3 percent compared with the conventional drilling plug liquid, and the sand carrying capacity is improved by 24 percent.
Example 3
A preparation method of a shear recoverable drilling fluid comprises the steps of measuring 97.2 parts of clear water by mass, adding 1.2 parts of regulator by mass, and uniformly stirring at 1000 rpm to obtain a mixed transparent solution A; adding 1.5 parts of viscoelastic surfactant into the solution A under the high-speed stirring of 1500 rpm, and reacting for 10min to obtain solution B; and after 10min, adding 0.1 part of bactericide into the solution B, and stirring for 2min at the speed of 100-200 r/min to finally obtain the shear-recoverable drilling plug liquid. The viscosity of the shear recoverable drilling plug liquid system is at 60 ℃ for 170s -1 Lower 24 mPa.s; after 2h of high-speed shearing, the viscosity retention rate is 83.3 percent and is increased by 23.8 percent compared with the viscosity retention rate of the conventional drilling plug fluid; after standing for 24 hours, the viscosity is recovered to 94.6 percent of the original viscosity; the drag reduction rate is improved by 14 percent compared with the conventional drilling plug liquid, and the sand carrying capacity is improved by 30 percent.
Example 4
A preparation method of a shear recoverable drilling fluid comprises the steps of measuring 96.9 parts of clear water by mass, adding 1.5 parts of regulator by mass, and uniformly stirring at 1000 rpm to obtain a mixed transparent solution A; at high speed of 1500 rpmAdding 1.5 parts of viscoelastic surfactant into the solution A under stirring, and reacting for 10min to obtain solution B; and after 10min, adding 0.1 part of bactericide into the solution B, and stirring for 2min at the speed of 100-200 r/min to finally obtain the shear-recoverable drilling plug liquid. The viscosity of the shear recoverable drilling plug liquid system is at 90 ℃ for 170s -1 A lower value of 21mPa · s; after 2h of high-speed shearing, the viscosity retention rate is 80.9 percent and is improved by 26.7 percent compared with the viscosity retention rate of the conventional drilling plug fluid; after standing for 24 hours, the viscosity is recovered to 96.5 percent of the original viscosity; the drag reduction rate is improved by 18.4 percent compared with the conventional drilling plug liquid, and the sand carrying capacity is improved by 28 percent.
Example 5
A preparation method of a shear recoverable drilling fluid comprises the following steps of measuring 97.2 parts of saline water (2.96 wt% of potassium chloride, 1wt% of sodium chloride, 0.02wt% of calcium chloride and 0.02wt% of magnesium chloride), adding 1.5 parts of a regulator according to a certain proportion, and uniformly stirring at 1000 rpm to obtain a mixed transparent solution A; adding 1.2 parts of viscoelastic surfactant into the solution A under the high-speed stirring of 1500 rpm, and reacting for 10min to obtain solution B; and after 10min, adding 0.1 part of bactericide into the solution B, and stirring for 2min at the speed of 100-200 r/min to finally obtain the shear-recoverable drilling plug liquid. The viscosity of the shear recoverable drilling plug liquid system is at 60 ℃ for 170s -1 Lower 14 mPa.s; after 2h of high-speed shearing, the viscosity retention rate is 85.7 percent, which is 48.8 percent higher than that of the conventional drilling plug fluid; after standing for 24 hours, the viscosity is restored to 97.2 percent of the original viscosity; the drag reduction rate is improved by 28.8 percent compared with the conventional drilling plug liquid, and the sand carrying capacity is improved by 21 percent.
Example 6
A preparation method of a shear recoverable drilling fluid comprises the steps of measuring 96.9 parts of saline water (2.96 wt% of potassium chloride, 1wt% of sodium chloride, 0.02wt% of calcium chloride and 0.02wt% of magnesium chloride), adding 1.5 parts of a regulator according to a certain proportion, and uniformly stirring at 1000 rpm to obtain a mixed transparent solution A; adding 1.5 parts of viscoelastic surfactant into the solution A under the high-speed stirring of 1500 rpm, and reacting for 10min to obtain solution B; and after 10min, adding 0.1 part of bactericide into the solution B, and stirring for 2min at the speed of 100-200 r/min to finally obtain the shear-recoverable drilling plug liquid. The shear recoverable drilling plug liquidThe viscosity of the product is at 90 ℃ for 170s -1 At a lower value of 12 mPas; after 2h of high-speed shearing, the viscosity retention rate is 83.3 percent, which is improved by 44.6 percent compared with the viscosity retention rate of the conventional drilling plug fluid; after standing for 24 hours, the viscosity is recovered to 96.7 percent of the original viscosity; the drag reduction rate is improved by 29.2 percent compared with the conventional drilling plug liquid, and the sand carrying capacity is improved by 18 percent.
Example 7
A preparation method of a shear recoverable drilling plug liquid comprises the steps of measuring 97.0 parts by weight of drilling plug return water of a certain platform in a Fuling work area, adding 1.5 parts by weight of a regulator according to a certain proportion, and uniformly stirring at 1000 rpm to obtain a mixed transparent solution A; adding 1.2 parts of viscoelastic surfactant into the solution A under the high-speed stirring of 1500 rpm, and reacting for 10min to obtain solution B; and after 10min, adding 0.3 part of bactericide into the solution B, and stirring for 2min at the speed of 100-200 rpm to finally obtain the shear-recoverable drilling plug liquid. The viscosity of the shear recoverable drilling plug liquid system is at 60 ℃ for 170s -1 Lower 18 mPa.s; after 2h of high-speed shearing, the viscosity retention rate is 88.9 percent, which is improved by 50.2 percent compared with the viscosity retention rate of the conventional drilling plug fluid; after standing for 24 hours, the viscosity is restored to 97.8 percent of the original viscosity; the drag reduction rate is improved by 22.1 percent compared with the conventional drilling plug liquid, and the sand carrying capacity is improved by 27 percent.
Example 8
A preparation method of a shear recoverable drilling plug liquid comprises the steps of weighing 96.7 parts by weight of drilling plug return effluent of a certain platform in a Fuling working area, adding 1.5 parts by weight of a regulator according to a certain proportion, and uniformly stirring at 1000 revolutions per minute to obtain a mixed transparent solution A; adding 1.5 parts of viscoelastic surfactant into the solution A under the high-speed stirring of 1500 rpm, and reacting for 10min to obtain solution B; and after 10min, adding 0.3 part of bactericide into the solution B, and stirring for 2min at the speed of 100-200 rpm to finally obtain the shear-recoverable drilling plug liquid. The viscosity of the shear recoverable drilling plug liquid system is at 60 ℃ for 170s -1 At a lower value of 16 mPas; after 2h of high-speed shearing, the viscosity retention rate is 86.2 percent, which is improved by 45.3 percent compared with the viscosity retention rate of the conventional drilling plug fluid; after standing for 24 hours, the viscosity is restored to 93.1 percent of the original viscosity; the drag reduction rate is improved by 27.5 percent compared with the conventional drilling plug liquid, and the sand carrying capacity is improved by 24 percent.
Comparative example 1
A preparation method of a shear recoverable drilling fluid comprises the steps of measuring 97.4 parts of clear water by mass, adding 1.5 parts of regulator by mass, and uniformly stirring at 1000 rpm to obtain a mixed transparent solution A; adding 1.0 part of viscoelastic surfactant into the solution A under the high-speed stirring of 1500 rpm, and reacting for 10min to obtain solution B; and after 10min, adding 0.1 part of bactericide into the solution B, and stirring for 2min at the speed of 100-200 r/min to finally obtain the shear-recoverable drilling plug liquid. The viscosity of the shear recoverable drilling plug liquid system is at 60 ℃ for 170s -1 At a lower value of 12 mPas; after 2h of high-speed shearing, the viscosity retention rate is 74.6 percent, which is improved by 17.2 percent compared with the viscosity retention rate of the conventional drilling plug fluid; after standing for 24 hours, the viscosity is recovered to 92.3 percent of the original viscosity; the drag reduction rate is improved by 15.9 percent compared with the conventional drilling plug liquid, and the sand carrying capacity is improved by 18 percent.
Comparative example 2
A preparation method of a shear recoverable drilling and plugging liquid comprises the steps of measuring 96.9 parts by mass of clear water, adding 1.8 parts by mass of a regulator into the clear water, and uniformly stirring at 1000 revolutions per minute to obtain a mixed transparent solution A; adding 1.2 parts of viscoelastic surfactant into the solution A under the high-speed stirring of 1500 rpm, and reacting for 10min to obtain solution B; and after 10min, adding 0.1 part of bactericide into the solution B, and stirring for 2min at the speed of 100-200 r/min to finally obtain the shear-recoverable drilling plug liquid. The viscosity of the shear recoverable drilling plug liquid system is at 60 ℃ for 170s -1 12 mPa.s at the lower part; after 2h of high-speed shearing, the viscosity retention rate is 82.8 percent, which is 22.7 percent higher than that of the conventional drilling plug fluid; after standing for 24 hours, the viscosity is recovered to 95.6 percent of the original viscosity; the drag reduction rate is improved by 24.1 percent compared with the conventional drilling plug liquid, and the sand carrying capacity is improved by 17 percent.
Comparative example 3
A preparation method of a shear recoverable drilling fluid comprises the steps of measuring 97.2 parts of clear water by mass, adding 1.5 parts of regulator by mass, and uniformly stirring at 1000 rpm to obtain a mixed transparent solution A; adding 1.2 parts of viscoelastic surfactant into the solution A under the high-speed stirring of 1500 rpm, and reacting for 10min to obtain solution B; after 10min, adding 0.5 part of bactericide into the solution B, and stirring at 100-200 rpmStirring for 2min to finally obtain the shear recoverable drilling plug liquid. The viscosity of the shear recoverable drilling plug liquid system is at 60 ℃ for 170s -1 Lower is 9 mPa.s; after 2h of high-speed shearing, the viscosity retention rate is 82.9 percent, which is 23.1 percent higher than that of the conventional drilling plug fluid; after standing for 24 hours, the viscosity is recovered to 95.2 percent of the original viscosity; the drag reduction rate is improved by 20.6 percent compared with the conventional drilling plug liquid, and the sand carrying capacity is improved by 14 percent.
According to the analysis of the embodiment and the comparative example, the viscosity retention rate, the resistance reducing rate, the sand carrying capacity and other performance parameters of the shear recoverable drilling fluid disclosed by the embodiment of the invention are obviously superior to those of the comparative example. The viscoelasticity of the shear recoverable drilling fluid system is derived from the repulsion generated by the aggregation number in the system and the surface charges of the aggregates, and the addition of the inorganic salt is essentially the addition of the counter ions of the surfactant, which has great influence on the repulsion between the surface charges of the micelle aggregates. Along with the increase of the concentration of the counter ions in a certain range, the spherical micelles in the system are converted into rod-shaped micelles, and the rod-shaped micelles are gradually associated to form worm-shaped micelles, so that the shear recoverable drilling plug liquid system has good salt resistance.
While embodiments of the present invention have been described, the present invention is not limited to the above-described embodiments, which are intended to be illustrative rather than limiting, and many modifications may be made by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (5)
1. The shear-recoverable drilling plug liquid is used for drilling a bridge plug after fracturing of a horizontal well by matching with a continuous oil pipe, and is characterized by comprising the following components in parts by mass by taking water as a dispersion medium: 1.2-1.5 parts of viscoelastic surfactant, 0.1-0.3 part of bactericide, 1.2-1.5 parts of regulator and 96.7-97.5 parts of water.
2. The shear recoverable drilling fluid of claim 1, wherein the viscoelastic surfactant is any one or a mixture of betaine amphoteric surfactant, nonionic surfactant and Gemini type surfactant.
3. The shear recoverable drilling fluid of claim 1, wherein the bactericide is any one or a mixture of formaldehyde, acetaldehyde, urea formaldehyde, glyoxal, acrolein, phenol, biphenol, hydrolyzed plant phenol, sodium polyphosphate, sodium chloride and copper chloride.
4. The shear-recoverable drilling fluid of claim 1, wherein the modifier is any one or any mixture of maleic acid, sodium p-toluenesulfonate, salicylic acid, ethanol, sodium chloride and isopropanol.
5. A method of preparing a shear recoverable drilling fluid of claim 1, comprising the steps of:
(1) Weighing clear water, adding a regulator in proportion, and uniformly stirring at 1000 rpm to obtain a mixed transparent solution A;
(2) Adding a viscoelastic surfactant into the solution A under the high-speed stirring of 1500 rpm, and reacting for 10min to obtain a solution B;
(3) And after 10min, adding the bactericide into the solution B, and stirring for 2min at the speed of 100-200 rpm to finally obtain the shear-recoverable drilling plug liquid.
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| CN101056959A (en) * | 2004-11-15 | 2007-10-17 | 罗迪亚公司 | Viscoelastic surfactant fluids having enhanced shear recovery, rheology and stability performance |
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