CN115386357A - Preparation method and application of composite dry powder for oil and gas development - Google Patents
Preparation method and application of composite dry powder for oil and gas development Download PDFInfo
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- CN115386357A CN115386357A CN202211321894.5A CN202211321894A CN115386357A CN 115386357 A CN115386357 A CN 115386357A CN 202211321894 A CN202211321894 A CN 202211321894A CN 115386357 A CN115386357 A CN 115386357A
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Abstract
The embodiment of the invention discloses a preparation method and application of composite dry powder for oil and gas development. The preparation method of the composite dry powder for oil and gas development comprises the following steps of mixing raw materials, and uniformly stirring, wherein the raw materials comprise: 0.1-5 parts of suspending agent, 10-50 parts of dispersing agent, 0.1-5 parts of preservative and 1-20 parts of anti-swelling agent. The composite dry powder for oil and gas development provided by the invention has excellent suspension performance, can be used by directly pouring the product into clear water and simply stirring, and also has the advantages of convenience in transportation, flexibility in construction, high temperature resistance, full water solubility, no toxicity, no harm and no corrosion.
Description
Technical Field
The embodiment of the invention relates to the technical field of oil and gas field development, in particular to a preparation method and application of composite dry powder for oil and gas development.
Background
The method has technical requirements for low-damage killing, oil reservoir shielding and liquid diversion, shaft sand removal, slurry filling and plugging or sand prevention in the oil field development process. Specifically, there is a need for a dry powder that satisfies both maintenance and workover sand removal, and that has excellent suspension properties; secondly, a clean, low-damage, non-corrosive and non-toxic high-density well control fluid with high temperature resistance and low cost is needed; thirdly, a product which is applicable to a high water-cut period, is environment-friendly and nontoxic and can shield an oil reservoir is needed; fourthly, a product which can be self-suspended and has high hydration speed during sand control is needed.
Therefore, the development of the multifunctional mortar dry powder with excellent suspension performance is an industrial problem to be solved in the field.
Disclosure of Invention
Therefore, the invention provides a preparation method and application of the composite dry powder for oil and gas development, the composite dry powder has excellent suspension performance, the product is directly poured into clear water and can be used by simple stirring, and meanwhile, the composite dry powder has the advantages of convenience in transportation, flexibility in construction, high temperature resistance, full water solubility, no toxicity, no harm and no corrosion.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:
according to a first aspect of the embodiments of the present invention, the present invention provides a preparation method of a composite dry powder for oil and gas development, wherein raw materials are mixed and uniformly stirred, and the raw materials comprise, by weight:
0.1-5 parts of suspending agent, 10-50 parts of dispersing agent, 0.1-5 parts of preservative and 1-20 parts of anti-swelling agent; the suspending agent is selected from one or more of hydroxyethyl cellulose, AMPS multipolymer, propylene-ethylene multipolymer and acrylamide-potassium acrylate multipolymer; the dispersant is selected from one or more of lignosulfonate, polycarboxylate and sulfonated melamine formaldehyde resin; the preservative is selected from one or more of sorbic acid, potassium sorbate and calcium propionate; the anti-swelling agent is selected from one or two of ammonium chloride and potassium chloride.
Further, the particle size of the suspending agent is 100-200 meshes.
Further, the raw material also comprises 1-980 parts of soluble salt, and the soluble salt is selected from one or two of sodium chloride and potassium chloride.
Further, the raw materials also comprise 1-980 parts of water-soluble resin, and the water-soluble resin is selected from one or two of PVA and SMA.
Further, the raw material also comprises 1-950 parts of sand, and the sand is selected from one or more of quartz sand, ceramsite sand and fracturing sand.
According to a second aspect of embodiments of the present invention, there is provided a composite dry powder for oil and gas development, made by the method as defined in any one of the above.
According to a third aspect of the embodiment of the invention, the invention provides an application of any one of the composite dry powders for oil and gas development in oil and gas development, and the composite dry powder for oil and gas development can be used by dissolving the composite dry powder for oil and gas development in water, wherein the water is used in an amount of 50-99.8% of the mass of the composite dry powder for oil and gas development.
The embodiment of the invention has the following advantages:
the composite dry powder provided by the invention takes a suspending agent, a dispersing agent, a preservative and an anti-swelling agent as raw materials. Wherein, the suspending agent has super strong suspension property; the dispersing agent can increase the dispersing speed in water and prevent fish eyes from forming; the preservative can greatly prolong the shelf life of the aqueous solution; the anti-swelling agent can prevent clay from swelling and blocking stratum, remarkably improves the suspension effect of the composite dry powder by compounding the raw materials, and can be used for the working procedures of well washing and sand cleaning without stopping a well, sand washing in workover operation, oil layer shielding, sand prevention and the like.
According to the invention, soluble salt is added into the composite dry powder, the liquid column pressure can be increased by the soluble salt, and by compounding the raw materials, when the suspension effect is satisfied, the density of the well killing fluid is greatly increased, the oil layer is buried, the pressure of a well head is reduced, and the composite dry powder can be used instead of high-cost solid-free well killing fluid.
The water-soluble resin is added into the composite dry powder, the water-soluble resin can form a bridging shielding effect and a slow dissolving speed in a shaft or a perforation, and the raw materials are compounded for use, so that the pressure bearing and the application range of the composite dry powder can be improved when the suspension effect is improved, and the composite dry powder can be used for oil layer shielding or steering construction in oil field fracturing, pressure drive, well washing, milling, sand washing, well killing and other constructions.
The composite dry powder is added with sand grains which can increase the pressure of a liquid column and form a sand wall, and the raw materials are compounded for use, can be self-suspended in water, and are mainly used for preparing ultrahigh-density well killing fluid, filling slurry when a suspended plug is drilled and preventing sand. When in sand prevention, the sand-carrying liquid is not needed to be used for carrying, and when in use, the sand-carrying liquid is directly added into a sand mixer for stirring and can be self-suspended after being stirred by clean water. The hydration speed is high, the sand carrying liquid does not need to be prepared in advance, and the problems of more preparation, waste, less preparation, insufficient preparation and the like are prevented.
The composite dry powder provided by the invention has no corrosion and toxicity to human skin, does not react with stratum liquid, does not generate precipitate, is completely water-soluble, and has wide application prospect.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
The raw materials used in the examples of the present invention are all commercially available products. Unless otherwise specified, the technical means used in the examples of the present invention are conventional means well known to those skilled in the art.
Example 1
The embodiment provides a composite dry powder for oil and gas development:
mixing 1 part of hydroxyethyl cellulose, 4 parts of AMPS multipolymer, 30 parts of lignosulfonate, 0.5 part of potassium sorbate and 18 parts of ammonium chloride, and uniformly stirring to obtain the composite material.
Example 2
The embodiment provides a composite dry powder for oil and gas development:
mixing 0.5 part of hydroxyethyl cellulose, 1.1 parts of propylene-ethylene multipolymer, 12 parts of lignosulfonate, 0.1 part of sorbic acid and 2 parts of potassium chloride, and uniformly stirring to obtain the modified starch.
Example 3
The embodiment provides a composite dry powder for oil and gas development:
mixing 1 part of hydroxyethyl cellulose, 4 parts of propylene-ethylene multi-component copolymer, 45 parts of polycarboxylate, 2 parts of sorbic acid and 10 parts of potassium chloride, and uniformly stirring to obtain the composite material.
Example 4
The embodiment provides a composite dry powder for oil and gas development:
mixing 1 part of hydroxyethyl cellulose, 4 parts of AMPS multipolymer, 30 parts of lignosulfonate, 5 parts of potassium sorbate, 15 parts of ammonium chloride and 8978 parts of sodium chloride 949.5 parts, and uniformly stirring to obtain the composite material.
Example 5
The embodiment provides a composite dry powder for oil and gas development:
mixing 1 part of hydroxyethyl cellulose, 2.4 parts of AMPS multipolymer, 30 parts of lignosulfonate, 0.5 part of potassium sorbate and 465 parts of potassium chloride, and stirring uniformly to obtain the composite material.
Example 6
The embodiment provides a composite dry powder for oil and gas development:
mixing 1 part of hydroxyethyl cellulose, 3 parts of propylene-ethylene multi-component copolymer, 30 parts of polycarboxylate, 0.5 part of sorbic acid, 15 parts of potassium chloride and 3242 parts of sodium chloride 782.5, and uniformly stirring to obtain the composite material.
Example 7
The embodiment provides a composite dry powder for oil and gas development:
mixing 1 part of hydroxyethyl cellulose, 4 parts of AMPS multipolymer, 30 parts of lignosulfonate, 0.5 part of potassium sorbate, 15 parts of ammonium chloride and 5363 parts of PVA949.5, and uniformly stirring to obtain the composite material.
Example 8
The embodiment provides a composite dry powder for oil and gas development:
mixing 0.5 part of hydroxyethyl cellulose, 3 parts of AMPS multipolymer, 10 parts of lignosulfonate, 0.5 part of potassium sorbate, 10 parts of potassium chloride and 285 parts of SMA, and stirring uniformly to obtain the composite material.
Example 9
The embodiment provides a composite dry powder for oil and gas development:
mixing 1 part of hydroxyethyl cellulose, 0.5 part of propylene-ethylene multi-component copolymer, 45 parts of polycarboxylate, 0.5 part of sorbic acid, 5 parts of potassium chloride and 450 parts of PVA, and stirring uniformly to obtain the polypropylene composite material.
Example 10
The embodiment provides a composite dry powder for oil and gas development:
mixing 1 part of hydroxyethyl cellulose, 4 parts of AMPS multipolymer, 30 parts of lignosulfonate, 0.5 part of potassium sorbate, 15 parts of ammonium chloride and 5363 parts of ceramsite sand 949.5, and stirring uniformly to obtain the product.
Example 11
The embodiment provides a composite dry powder for oil and gas development:
mixing 0.5 part of hydroxyethyl cellulose, 1.5 parts of AMPS multipolymer, 10 parts of lignosulfonate, 0.5 part of sorbic acid, 5 parts of potassium chloride and 480 parts of quartz sand, and uniformly stirring to obtain the composite material.
Example 12
The embodiment provides a composite dry powder for oil and gas development:
mixing 1 part of hydroxyethyl cellulose, 4 parts of propylene-ethylene multipolymer, 30 parts of polycarboxylate, 0.5 part of sorbic acid, 15 parts of potassium chloride and 3242 parts of fracturing sand 949.5, and uniformly stirring to obtain the fracturing sand.
Test example 1
The performance of the composite dry powder for oil and gas development of examples 1 to 12 of the present invention was examined.
(1) Appearance of the product
Visual inspection was performed under sufficient light.
(2) Water solubility
2.1 preparing base liquid: adding 50 g of the material B (a mixture of a suspending agent, a dispersing agent and a preservative) into 1000 g of water stirred by a stirrer, and stirring for 0.5 hour for later use;
2.2 weigh 1 g of the 2.1 solution, add to 100 g of water for 2 hours, and observe the presence or absence of precipitation.
(3) Degree of fluidity
3.1 fluidity of base liquid, and the reciprocal of plastic viscosity is fluidity.
3.1.1 pouring the 2.1 prepared base liquid into the graduation of the sample cup of the viscometer, adjusting the viscometer to 600R/min to rotate, reading and recording 600R/min after the reading value of the dial is stable, and recording as R 600 (ii) a The rotating cylinder is rotated at 3R/min after the rotating cylinder is static for 1 minute, and after the dial reading value is stable, the dial reading value at 3R/min is read and recorded and is recorded as R 3 (ii) a Adjusting the viscometer to 300R/min for rotation, after the dial reading value is stable, reading and recording 300R/min, and recording as R 300 。
3.1.2 measurement of the Plastic viscosity μ p =(τ-τ 0 )/r = R 600 - R 300
3.1.3 calculation
Fluidity:
V=1/(R 600 -R 300 ) （1）
3.2 Fluidity of the preparation
Fluidity reflects one property of the slurry to continue to flow against the drag caused by internal friction. In the process, the fluidity of the slurry is usually represented by the time that the slurry with a certain volume is stood for a certain time and then flows out through a small hole with a certain aperture.
240 g of 2.1 prepared base liquid is taken, 320 g of material A (mixture of soluble salt and anti-swelling agent) is added, and the mixture is stirred uniformly by a stirring rod to prepare the prepared liquid for standby.
The 1006 funnel slurry viscometer outlet was blocked with a finger and a freshly drawn 200mL sample of the formulation was poured into a clean, upright funnel. The stop watch was started while the finger was removed, and the time required for completion of the preparation flow was measured to indicate the fluidity.
(4) Apparent viscosity, mPas, shear rate 1022S -1 Apparent viscosity of the resulting mixture.
4.1 According to R in 3.1.1 600 The readings calculate the apparent viscosity.
4.2 calculation of
The apparent viscosity of the base fluid is calculated according to formula (2):
η a =0.5R 600 （2）
in the formula:
η a shear rate 1022S -1 Apparent viscosity in millipascal seconds (mPa · s);
R 600 -a stable reading at 600 r/min;
(5) Initial shear force of base fluid
In order to have good suspension performance and lower pumping pressure, the initial value of tau is required to be moderate.
The initial force is calculated according to the formula (3):
τ first stage =0.511R 3 （3）
τ First stage -initial shear force in pascals (Pa);
(6) Suspension stability: and taking 3.2 of the prepared solution, uniformly stirring the solution by using a stirring rod, and then putting 50mL of the solution into a 50mL colorimetric tube to stand for 24 hours to observe whether layering exists or not.
(7) Water invasion resistance: after 10mL of 3.2 prepared solution was added with 5mL of tap water and stirred with a stirring bar, the mixture was left for 24 hours and no separation was observed.
(8) High temperature resistance
8.1 pour 3.2 liquids into 1 500mL tetrafluoro autoclave.
250mL of 2.1 parts of base solution are respectively poured into 2 500mL tetrafluoro high-temperature reaction kettles. The 3 samples are sealed and then placed in an oven. Setting the oven at 130 ℃, starting a heating device and a fan to heat for 8 hours, taking out the reaction kettle, naturally cooling to room temperature, and opening the reaction kettle.
8.2 after cooling to room temperature, the viscosity of 600 r/min was measured.
8.3 calculate the viscosity retention, the percentage of apparent viscosity of the base fluid after high temperature before high temperature.
The viscosity retention was calculated according to formula (4):
L =(η rear end /η a )×100% （4）
In the formula:
l-viscosity retention;
η a shear rate 1022S -1 Apparent viscosity in millipascal seconds (mPa · s);
η rear end High temperature post shear rate of 1022S -1 Apparent viscosity in millipascal seconds (mPa · s);
8.4 the solution was cooled to room temperature and stirred well, 200mL was taken and placed in a 250mL graduated cylinder, and the time for 10mL of clear solution to settle was recorded.
(9) Organic chlorine
The organic chlorine of the material A and the material B is respectively measured by 5 percent according to the specification of Q/SH1020 2093.
(10) pH value
A0.5% aqueous solution was prepared and stirred for 5 minutes in a room temperature stirrer and then measured using an extensive pH paper.
(11) Solid content
10.00g of the sample is weighed into a weighing bottle with constant weight, dried in an oven for 4h at 100 ℃ and weighed again. The solid content is calculated according to formula (5):
W=[(G rear end -G 0 )/(G Front side -G 0 )]×100% （5）
In the formula:
w-solid content;
G front side The sum of the mass of the sample before drying and the mass of the weighing bottle is g;
G 0 -weighing the bottle mass, g;
G rear end The sum of the mass of the dried sample and the weight of the weighing bottle, and g.
(12) Sieving rate
100 g of sample is weighed, sieved by an 8-mesh sieve and the passing rate is measured.
(13) Amount of leakage
13.1 20 g of the composite dry powder and 230 g of tap water are weighed and poured into a beaker. The stirrer is started to stir for 30 minutes for standby. The air pump is used for inflating the water loss instrument, and the handle of the pressure reducing valve is rotated clockwise, so that the pressure gauge indicates 1 MPa.
13.2 The cup mouth of the liquid cup is placed upwards, the small air hole on the liquid cup is blocked by a forefinger, the prepared liquid is poured in to enable the liquid level to be equal to the annular scale mark in the cup, then the O-shaped rubber gasket is placed at the step position of the inner wall of the liquid cup, the bottom cover is screwed clockwise, and the liquid cup is clamped firmly.
13.3 And (3) reversing the liquid cup, blocking the filtrate drainage nozzle, reversing to enable the air hole to be upward, enabling the filtrate drainage nozzle to be downward, rotating the well killing liquid cup body in the anticlockwise direction at 90 ℃, installing the three-way joint, and clamping the hanging rack and the measuring cylinder.
13.4 The pressure reducing handle is finely adjusted to accurately indicate the pressure to 0.7 MPa, the air inlet valve is opened, and the stopwatch is pressed to record the measuring time.
13.5 In the measuring process, the pressure is always kept at 0.7 MPa, if the pressure is reduced, the air cylinder is used for inflating and supplementing, the pressure reducing handle is finely adjusted, and the pressure is kept constant.
13.6 And (3) collecting the last drop of filtrate after 30min, cutting off the gas source, opening the air release valve, releasing the pressure in the cup, rotating for 1/4 circle in any direction, and taking down the liquid cup, wherein the volume of the filtrate received in the measuring cylinder is the leakage amount.
(14) Softening point
Weighing 10 g of a sample of the composite dry powder, putting the sample into an oven at 120 ℃ for 2h, and observing whether the softening phenomenon exists or not so as to judge whether the softening point is more than 120 ℃.
(15) Shielding rate and blockage relieving rate
15.1 rock sample preparation
Selecting a gas measuring permeability range of (50 to 100) multiplied by 10 -3 μm 2 、（200~500）×10 -3 μm 2 Or (2~5) μm 2 The artificial core of (1). Air permeability, evacuation saturation and pore volume were determined as specified in SY/T5358-2010, 5.1.
15.2 test procedure
And (4) performing the measurement according to the specification of 6.3.1 to 6.3.3 in SY/T5358-2010, and measuring the water phase permeability KW1 of the rock core by passing standard saline water in the forward direction.
Preparing composite dry powder shielding liquid according to 8%, reversely introducing the core, controlling the total introduction amount to be 1PV, and standing at 60 ℃ for 6h. Measuring the water phase permeability K of the core by operating according to 6.3.3 in SY/T5358-2010 and passing standard saline water in the reverse direction W2 . The temperature is raised to 75 ℃, and the mixture is placed for 6 hours at constant temperature. Normal direction standard salt water 2PV。
Measuring the water phase permeability K of the core by operating at 6.3.3 in SY/T5358-2010 through standard saline water in the forward direction W3 。
Mask rate calculation
The shielding rate is calculated according to equation (6):
Z=[(K W1 -K W2 )/K W1 ]×100% （6）
in the formula:
z is shielding rate;
K W1 water phase permeability before shielding, 10 -3 μm 2 ；
K W2 After screening, water phase Permeability, 10 -3 μm 2 。
Calculation of blockage removal rate
The blockage removal rate is calculated according to the formula (7):
J=(K W3 /K W1 )×100% （7）
in the formula:
j-blockage removal rate;
K W1 water phase permeability before shielding, 10 -3 μm 2 ；
K W3 Water phase permeability after deblocking, 10 -3 μm 2 。
(16) Sand cleaning ability
2.5 g of the dry composite powder is weighed, 500 g of water is added, a JJ-1 stirrer is started to stir for 30 minutes, and 5% solution is prepared. Then 50 g of 40-60 mesh fracturing ceramsite sand is added, stirred for 5 minutes and then kept stand for 24 hours, and whether the sand grains are precipitated or not is observed.
The properties of examples 1-3 were tested and the results are shown in Table 1.
TABLE 1
The results show that the composite dry powder provided by the embodiments 1 to 3 of the invention meets the requirements in all aspects of performance, has high solid content, is completely water-soluble, has proper apparent viscosity, has excellent sand cleaning capability and does not contain organic chlorine.
The properties of examples 4-6 were tested and the results are shown in Table 2.
TABLE 2
The results show that the composite dry powder provided by the embodiments 4 to 6 of the invention meets the requirements in all aspects, is completely water-soluble, resists high temperature of 130 ℃, and does not contain organic chlorine.
The properties of examples 7-9 were tested and the results are shown in Table 3.
TABLE 3
The results show that the composite dry powders provided by the embodiments 7 to 9 of the invention meet the requirements in all aspects of performance, are completely water-soluble, have excellent shielding performance and unblocking performance, and do not contain organic chlorine.
The properties of examples 10-12 were measured and the results are shown in Table 4.
TABLE 4
Wherein: method for measuring apparent viscosity: weighing 300 g of the composite dry powder, adding 500 g of water, starting a JJ-1 stirrer to stir for 30 minutes, standing for 30 minutes, taking a supernatant fluid, referring to 6.4, and measuring the apparent viscosity at 600 r/min by using a six-speed rotational viscometer.
The results show that the composite dry powders provided by the embodiments 10 to 12 of the invention meet the requirements in various aspects, have proper apparent viscosity and do not contain organic chlorine.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (7)
1. The preparation method of the composite dry powder for oil and gas development is characterized by mixing and uniformly stirring raw materials, wherein the raw materials comprise the following components in parts by weight:
0.1-5 parts of suspending agent, 10-50 parts of dispersing agent, 0.1-5 parts of preservative and 1-20 parts of anti-swelling agent;
the suspending agent is selected from one or more of hydroxyethyl cellulose, AMPS multipolymer, propylene-ethylene multipolymer and acrylamide-potassium acrylate multipolymer;
the dispersant is selected from one or more of lignosulfonate, polycarboxylate and sulfonated melamine formaldehyde resin;
the preservative is selected from one or more of sorbic acid, potassium sorbate and calcium propionate;
the anti-swelling agent is selected from one or two of ammonium chloride and potassium chloride.
2. The method for preparing the composite dry powder for oil and gas development according to claim 1, wherein the particle size of the suspending agent is 100-200 meshes.
3. The method for preparing the composite dry powder for oil and gas development according to claim 1, wherein the raw material further comprises 1-980 parts of soluble salt, and the soluble salt is selected from one or two of sodium chloride and potassium chloride.
4. The method for preparing the composite dry powder for oil and gas development according to claim 1, wherein the raw materials further comprise 1-980 parts of water-soluble resin, and the water-soluble resin is selected from one or two of PVA and SMA.
5. The method for preparing the composite dry powder for oil and gas development according to claim 1, wherein the raw material further comprises 1-950 parts of sand, and the sand is selected from one or more of quartz sand, ceramsite sand and fracturing sand.
6. A composite dry powder for oil and gas development, which is produced by the method according to any one of claims 1 to 5.
7. The application of the composite dry powder for oil and gas development in oil and gas development of claim 6, wherein the composite dry powder for oil and gas development can be used after being dissolved in water, and the amount of the water is 50-99.8% of the mass of the composite dry powder for oil and gas development.
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