CN112608728A - Preparation method of low-solid-phase high-density completion fluid - Google Patents

Preparation method of low-solid-phase high-density completion fluid Download PDF

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CN112608728A
CN112608728A CN202011485253.4A CN202011485253A CN112608728A CN 112608728 A CN112608728 A CN 112608728A CN 202011485253 A CN202011485253 A CN 202011485253A CN 112608728 A CN112608728 A CN 112608728A
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stirring
completion fluid
temperature
fluid
density
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肖刚
宋芳
李�荣
徐兴华
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Chengdu West China Oil Wei Technology Co ltd
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Chengdu West China Oil Wei Technology Co ltd
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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
    • C09K8/60—Compositions for stimulating production by acting on the underground formation
    • 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
    • C09K8/60—Compositions for stimulating production by acting on the underground formation
    • C09K8/84—Compositions based on water or polar solvents
    • C09K8/845—Compositions based on water or polar solvents containing inorganic compounds
    • 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
    • C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
    • C09K2208/32—Anticorrosion additives

Abstract

The invention discloses a preparation method of a low solid phase high density completion fluid, which comprises the following steps: step 1: preparing base fluid of completion fluid, and adjusting the density of the base fluid of completion fluid to 1.8g/cm3(ii) a Step 2: adding weighting agent into the base fluid of the completion fluid to ensure that the density of the base fluid of the completion fluid is from 1.8g/cm3Adjusted to 2.4g/cm3(ii) a The step 1 comprises the following steps: s1: putting the solid-free weighting agent and sodium bromide or potassium chloride into a stirrer according to the mass ratio of 1-2:1-4, stirring and mixing, dissolving the mixture in water, and stirring for 30-50min at the temperature of 40-45 ℃; s2: after cooling, adding the sodium bicarbonate and the high-temperature-resistant modified imidazoline corrosion inhibitor into a stirrer to be stirred and dissolved. The invention provides a preparation method of a low solid phase high density completion fluid, and the density of the low solid phase high density completion fluid prepared by the preparation method can reach 2.4g/cm3(ii) a The high-temperature high-pressure high-corrosion-resistance high-temperature high-corrosion-resistance deep well can be used for developing high-temperature and high-pressure deep wells, and has good stability and low corrosion;and the density of the low solid phase high density completion fluid reaches 2.4g/cm3After that, it still has better stability.

Description

Preparation method of low-solid-phase high-density completion fluid
Technical Field
The invention relates to the technical field of oil and natural gas exploitation and completion, in particular to a preparation method of a low-solid-phase high-density completion fluid.
Background
Oil and gas well development includes the processes of drilling, completion and production. In the production process of the oil and gas well, corresponding downhole operations such as well repair and the like are carried out on the downhole faults. First, after the drilling work is finished, completion work is performed. The well completion operation refers to a process of communicating a shaft and a stratum in a certain structure after an open hole is drilled to reach a designed well depth. The generalized well completion process mainly comprises the following steps: drilling a production layer, communicating a borehole with the production layer, installing an oil and gas wellhead device, performing pilot production and the like. The well completion method refers to a communication mode of a well bore and a hydrocarbon reservoir of an oil-gas well, and a well body structure, a well head device and related technical measures adopted for realizing the specific communication mode. The well completion technology requires that the oil-gas reservoir and the well bore can be effectively communicated, and the resistance of oil gas flowing into the well bore is as small as possible; the oil, gas and water layers can be effectively sealed and isolated, mutual interference does not occur, and the requirements of layered mining and management are met for a plurality of oil and gas layers; the influence of collapse and sand production of the well wall of the oil-gas layer can be overcome or reduced, the integrity of a well completion pipe column and a shaft is ensured, and the oil-gas well can stably produce for a long time.
The goal of well completion is to maximize the access to the earth formation, thereby ensuring the highest production and recovery rate from the well. Broadly, any fluid used to contact the producing formation due to operational requirements is referred to as a completion fluid. In a particular production process, the foreign fluids that contact the hydrocarbon reservoir used before the test are referred to as completion fluids, such as drilling (hydrocarbon reservoir) fluids, perforating fluids, fracturing/acidizing fluids, and the like. The main functions of completion fluids are: the well completion agent has the advantages of balancing the formation pressure, protecting the reservoir, reducing the damage to the reservoir, maintaining the cleanness in the well, having good anticorrosion effect and maintaining the stability of various performances in the well, thereby ensuring the safety and smoothness of the well completion operation. Completion fluids can be classified into 3 categories, gas-based, oil-based and water-based, based on the characteristics of the continuous phase, with water-based completion fluids being the most widely used.
The density can reach 1.8g/cm except for well completion drilling fluid3Completion fluid and workover fluidIn the liquid, bromine salts, formate salts and organic salts are mainly used. Cesium formate in formate can reach higher density and has good performance, but because mineral resources are limited, two main mineral areas are distributed abroad at present, the price is high and extremely high, and a matched recycling matching technology is not established in the practical application process. The use of cesium formate is limited due to the excessive production cost. The organic salt comprehensively considers the functional requirements of the completion fluid and the workover fluid, can be biodegraded, is environment-friendly, can be suitable for high-temperature and high-pressure and ultra-deep well environments, has wide application prospect, and is the development direction of novel completion/workover fluids.
The patent No. ZL201510018549.8 relates to an environment-friendly high-density solid-free weighting agent and a preparation method thereof, and the highest density of a solid-free solution prepared by the solid-free weighting agent is 1.828g/cm3. However, the density of the solid-free completion fluid system in the prior art cannot be further improved.
Disclosure of Invention
The invention aims to provide a preparation method of a low solid phase high density completion fluid, and the method can be used for preparing the low solid phase high density completion fluid with the density of more than 1.8g/cm3The low solid phase high density completion fluid; and the density of the low solid phase high density completion fluid reaches 2.4g/cm3After that, it still has better stability.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a preparation method of a low solid phase high density completion fluid comprises the following steps:
step 1: preparing base fluid of completion fluid, and adjusting the density of the base fluid of completion fluid to 1.8g/cm3；
Step 2: adding weighting agent into the base fluid of the completion fluid to ensure that the density of the base fluid of the completion fluid is from 1.8g/cm3Adjusted to 2.4g/cm3；
The step 1 comprises the following steps:
s1: putting the solid-free weighting agent and sodium bromide or potassium chloride into a stirrer according to the mass ratio of 1-2:1-4, stirring and mixing, dissolving the mixture in water, and stirring for 30-50min at the temperature of 40-45 ℃;
s2: after cooling, adding the sodium bicarbonate and the high-temperature-resistant modified imidazoline corrosion inhibitor into a stirrer, stirring and dissolving for 20-30min at the stirring temperature of 35-40 ℃ and at the stirring speed of 100-300 r/min;
s3: after stirring, keeping the temperature for 5-10 minutes, adding sodium sulfite, and stirring to complete the preparation of the base fluid of the completion fluid;
wherein the weighting agent in the step 2 is micro iron powder, and the mesh number of the micro iron powder is 4500-5500 meshes; adding the micro-iron powder into a stirring device for pressure stirring, wherein the stirring time is 40-60min, and the stirring temperature is 45-60 ℃.
Further limiting, 40-50 parts of sodium bromide or potassium chloride, 2-3 parts of sodium bicarbonate, 0.5-2 parts of high-temperature resistant modified imidazoline corrosion inhibitor, 0.1-0.5 part of sodium sulfite and enough water to ensure that the density of the base fluid of the completion fluid is 1.8g/cm3。
Further optimized, 45 parts of sodium bromide or potassium chloride, 1.5 parts of sodium bicarbonate, 1 part of high-temperature-resistant modified imidazoline corrosion inhibitor and 0.3 part of sodium sulfite.
Further optimized, the specific preparation process of S1 is that the solid-free weighting agent and sodium bromide or potassium chloride are put into a stirrer according to the mass ratio of 1.5:2 to be stirred and mixed, and the mixture is dissolved in water for 40min at the stirring temperature of 43 ℃.
Further optimized, in S2, the stirring time is 25min, the stirring temperature is 38 ℃, and the stirring speed is 200 r/min.
Further optimization, in S3, the heat preservation time is 6 min.
Further optimization, in the step 2, the mesh number of the micro iron powder is 5000 meshes, in the step, the stirring time is 45min, and the stirring temperature is 50 ℃.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a preparation method of a low solid phase high density completion fluid, and the density of the low solid phase high density completion fluid prepared by the preparation method can reach 2.4g/cm3(ii) a In addition, the high-temperature high-pressure high-corrosion-resistance high-performance high-temperature-resistant high-corrosion-resistance high-performance high-temperature-resistant deep well can be used for deep well development at high temperature and high; more importantly, the method comprises the following steps of,the density of the low solid phase high density completion fluid reaches 2.4g/cm3After that, it still has better stability.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic view of the overall structure of the blender according to the present invention.
FIG. 2 is a schematic view of the connection relationship between the stirring rod and the bevel gear transmission mechanism and the connecting rod according to the present invention.
Reference numerals: 1-outer cylinder, 2-inner cylinder, 3-cover, 4-heating wire, 5-gap, 6-thermal insulation material, 7-support, 8-spherical hinge pair, 9-stirring component, 10-first driving component, 11-support leg, 12-connecting column, 13-spherical hinge seat, 14-spherical core, 15-spherical matching surface, 16-mounting hole, 17-mounting sleeve, 18-stirring rod, 19-stirring structure, 20-bearing, 21-motor, 22-rotating shaft, 23-connecting rod, 24-gear transmission mechanism, 25-bevel gear transmission mechanism, 26-shaft sleeve, 27-first bevel gear, 28-second bevel gear, 29-first gear, 30-second gear, 31-sealing ring, 32-guide surface.
Detailed Description
The present invention will be further described with reference to the following examples, which are intended to illustrate only some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, other embodiments used by those skilled in the art without any creative effort belong to the protection scope of the present invention.
Example one
The embodiment discloses a preparation method of a low solid phase high density completion fluid, which comprises the following steps:
step 1: preparing base fluid of completion fluid, and adjusting the density of the base fluid of completion fluid to 1.8g/cm3；
Step 2: adding weighting agent into the base fluid of the completion fluid to ensure that the density of the base fluid of the completion fluid is from 1.8g/cm3Adjusted to 2.4g/cm3；
The step 1 comprises the following steps:
s1: putting the solid-free weighting agent and sodium bromide into a stirrer according to the mass ratio of 1:1, stirring and mixing, dissolving the mixture in water, and stirring for 30min at the stirring temperature of 40 ℃;
s2: after cooling, adding the sodium bicarbonate and the high-temperature-resistant modified imidazoline corrosion inhibitor into a stirrer, stirring and dissolving for 20min at the stirring temperature of 35 ℃ and the stirring speed of 100 r/min;
s3: after stirring, keeping the temperature for 5 minutes, adding sodium sulfite and stirring to complete the preparation of the base fluid of the completion fluid;
wherein the weighting agent in the step 2 is micro iron powder, and the mesh number of the micro iron powder is 4500 meshes; adding the micro-iron powder into a stirring device, and stirring under pressure for 40min at the stirring temperature of 45 ℃.
Wherein, further optimization, in the embodiment, the solid-free weighting agent, 40 parts of sodium bromide, 2 parts of sodium bicarbonate, 0.5 part of high-temperature resistant modified imidazoline corrosion inhibitor, 0.1 part of sodium sulfite and enough water ensure that the density of the base fluid of the completion fluid is 1.8g/cm3。
In the embodiment, the structure of the stirrer used for preparing the low solid phase high density completion fluid is as follows:
the stirrer comprises an outer cylinder 1, an inner cylinder 2, a cover 3 and a stirring device, wherein the inner cylinder 2 is arranged in the outer cylinder 1, a gap 5 is formed between the inner cylinder 2 and the outer cylinder 1, and a heat-insulating material 6 is filled in the gap 5; the stirring device comprises a bracket 7, a spherical hinge pair 8, a stirring component 9, a first driving component 10 and a second driving component;
support 7 is installed on urceolus 1 through first drive assembly 10, and support 7 passes through spliced pole 12 with lid 3 to be connected, and the vice 8 of spherical hinge is installed on lid 3, and the two drive assembly of second is installed on support 7, and stirring subassembly 9 passes through the vice 8 of spherical hinge and installs on lid 3, and the second drive dress is connected with stirring subassembly 9, and second drive assembly is used for driving stirring subassembly 9 and realizes the stirring to the material.
The spherical hinge pair 8 comprises a spherical hinge seat 13 and a spherical core 14, the spherical hinge seat 13 is installed on the cover 3 and is provided with a spherical matching surface 15, the spherical core 14 is installed on the spherical hinge installation seat through the spherical matching surface 15, an installation hole 16 is formed in the spherical core 14, an installation sleeve 17 is fixedly installed in the installation hole 16, and the stirring assembly 9 is connected with the installation sleeve 17.
Wherein, stirring subassembly 9 includes puddler 18 and sets up the stirring structure 19 at puddler 18 tip, and puddler 18 rotates with mounting sleeve 17 and is connected.
Further defined, the agitator arm 18 is connected to the mounting sleeve 17 by a bearing 20.
Further preferably, the second driving assembly comprises a motor 21, a rotating shaft 22, a connecting rod 23, a gear transmission mechanism 24 and a bevel gear transmission mechanism 25, the motor 21 is fixedly installed on the support 7, the rotating shaft 22 is positioned below the motor 21 and rotatably installed on the support 7, the motor 21 is connected with the rotating shaft 22 through the gear transmission mechanism 24, one end of the connecting rod 23 is fixedly connected with the rotating shaft 22, and the other end of the connecting rod is rotatably connected with the stirring rod 18 through a shaft sleeve 26;
the bevel gear transmission mechanism 25 comprises a first bevel gear 27 and a second bevel gear 28, the first bevel gear 27 is fixedly arranged on the bracket 7, the rotating shaft 22 passes through the first bevel gear 27, the second bevel gear 28 is arranged at the end part of the stirring rod 18, and the first bevel gear 27 and the second bevel gear 28 are meshed with each other.
Preferably, the gear transmission 24 includes a first gear 29 and a second gear 30, the first gear 29 is connected to the output shaft of the motor 21, the second gear 30 is connected to the rotating shaft 22, and the first gear 29 and the second gear 30 are engaged with each other.
Further preferably, the connecting column 12 is provided with a reinforcing rib plate, so that the connecting column 12, the bracket 7 and the cover 3 can be connected more tightly.
Further optimize, be provided with sealing washer 31 between lid 3 and the inner tube 2, can make lid 3 and inner tube 2 when closing like this, can effectually prevent that the material from spilling over.
Further preferably, the upper end of the outer cylinder 1 is turned over outwards, and then the inner side surface forms a guide surface 32, when the cover 3 is covered on the inner cylinder 2, the sealing ring 31 arranged on the cover 3 is pressed on the guide surface 32; like this, when can making lid 3 and inner tube 2 lid close through the spigot surface 32 that forms, more convenient, spigot surface 32 can play the effect of direction, is convenient for realize the lid between lid 3 and the inner tube 2 and closes.
Further preferably, the lower end of the outer cylinder 1 is provided with a support leg 11, so that the outer cylinder 1 can be far away from the ground, and the purpose of rust prevention is achieved.
Further preferably, the first driving assembly 10 is a pneumatic driving assembly or a hydraulic driving assembly;
the pneumatic driving assembly comprises an air pump and a pneumatic cylinder, the air pump is connected with the pneumatic cylinder, and two ends of the pneumatic cylinder are respectively connected with the support 7 and the outer cylinder 1.
Further optimize, in order to guarantee that the heating purpose can be realized when using, the outer side wall of the outer barrel 1 is wound with a heating wire 4, and materials in the inner barrel 2 are heated through the arranged heating wire 4 so as to meet the requirement of preparation temperature.
Therefore, in actual use, the heat insulation material 6 is arranged between the inner barrel 2 and the outer barrel 1, so that in actual use, the heat insulation effect can be achieved when the low-solid-phase high-density completion fluid is prepared, and the raw materials of all components can be promoted to be dissolved more quickly when the material is heated; the first driving assembly 10 is arranged to drive the bracket 7 to ascend or descend, so that the cover 3 is matched with the inner barrel 2, and the charging is convenient in actual use; in the preparation process, after the motor 21 is started, the first gear 29 is driven to rotate, so that the rotating shaft 22 connected with the second gear 30 rotates, the connecting rod 23 is driven to rotate by the rotation, and the connecting rod 23 is rotatably connected with the stirring rod 18 through a shaft sleeve 26, so that the stirring rod 18 can deflect around the spherical center position of the spherical core 14 of the spherical hinge pair 8 under the action of the connecting rod 23, and the stirring structure 19 at the end part of the stirring rod 18 can disturb materials; moreover, under the action of the first bevel gear 27 and the second bevel gear 28, when the second bevel gear 28 rotates along the edge of the first bevel gear 27, the second bevel gear 28 can rotate, so that the stirring structure 19 at the end of the stirring rod 18 can stir the materials; thus, in actual stirring, the stirring rod 18 can drive the stirring structure 19 to do circular motion in the inner cylinder 2, so as to stir materials; meanwhile, the stirring rod 18 can rotate to enable the stirring structure 19 to rotate while doing circular motion, so that the stirring effect can be effectively improved, and materials of all components can be more fully fused; compare in traditional mixer, the mixer stirring effect that provides in this embodiment is more, is applicable to the production low solid phase high density completion fluid more and uses.
It should be noted that, in this embodiment, the solid-free weighting agent is an environment-friendly solid-free weighting agent for HWJZ-1 oil and gas fields developed by yokexi oil hua wei science and technology limited company, and compared with conventional inorganic salts (NaCl, KCl, CaCl2, MgCl2, etc.) and organic salts (NaCOOH, KCOOH, CsCOOH, etc.) weighting fluids, the solid-free weighting agent has the advantages of higher density, less corrosion, high temperature and pressure resistance stability, and the like, and is environmentally friendly and moderate in price, and the preparation density can reach up to 1.82g/cm3。
Example two
The embodiment discloses a preparation method of a low solid phase high density completion fluid, which comprises the following steps:
step 1: preparing base fluid of completion fluid, and adjusting the density of the base fluid of completion fluid to 1.8g/cm3；
Step 2: adding weighting agent into the base fluid of the completion fluid to ensure that the density of the base fluid of the completion fluid is from 1.8g/cm3Adjusted to 2.4g/cm3；
The step 1 comprises the following steps:
s1: putting the solid-free weighting agent and sodium bromide in a mass ratio of 1.5:2 into a stirrer, stirring and mixing, dissolving the mixture in water, and stirring for 40min at the stirring temperature of 43 ℃;
s2: after cooling, adding the sodium bicarbonate and the high-temperature-resistant modified imidazoline corrosion inhibitor into a stirrer, stirring and dissolving for 25min at the stirring temperature of 38 ℃ and at the stirring speed of 200 r/min;
s3: after stirring, keeping the temperature for 8 minutes, adding sodium sulfite and stirring to complete the preparation of the base fluid of the completion fluid;
wherein the weighting agent in the step 2 is micro iron powder, and the mesh number of the micro iron powder is 5000 meshes; adding the micro-iron powder into a stirring device, and stirring under pressure for 50min at the stirring temperature of 55 ℃.
Wherein, further optimization, in the embodiment, the solid-free weighting agent, 45 parts of sodium bromide, 2.5 parts of sodium bicarbonate, 1 part of high-temperature resistant modified imidazoline corrosion inhibitor, 0.3 part of sodium sulfite and enough water ensure that the density of the base fluid of the completion fluid is 1.8g/cm3。
EXAMPLE III
The embodiment discloses a preparation method of a low solid phase high density completion fluid, which comprises the following steps:
step 1: preparing base fluid of completion fluid, and adjusting the density of the base fluid of completion fluid to 1.8g/cm3；
Step 2: adding weighting agent into the base fluid of the completion fluid to ensure that the density of the base fluid of the completion fluid is from 1.8g/cm3Adjusted to 2.4g/cm3；
The step 1 comprises the following steps:
s1: putting the solid-free weighting agent and sodium bromide into a stirrer according to the mass ratio of 2:4, stirring and mixing, dissolving the mixture in water, and stirring for 50min at the stirring temperature of 45 ℃;
s2: after cooling, adding the sodium bicarbonate and the high-temperature-resistant modified imidazoline corrosion inhibitor into a stirrer, stirring and dissolving for 30min at the stirring temperature of 40 ℃ and at the stirring speed of 300 r/min;
s3: after stirring, keeping the temperature for 10 minutes, adding sodium sulfite and stirring to complete the preparation of the base fluid of the completion fluid;
wherein the weighting agent in the step 2 is micro iron powder, and the mesh number of the micro iron powder is 5500 meshes; adding the micro iron powder into a stirring device for pressure stirring, wherein the stirring time is 60min, and the stirring temperature is 60 ℃.
Wherein, further optimization, in the embodiment, the solid-free weighting agent, 50 parts of sodium bromide, 3 parts of sodium bicarbonate, 2 parts of high-temperature resistant modified imidazoline corrosion inhibitor, 0.5 part of sodium sulfite and enough water ensure that the density of the base fluid of the completion fluid is 1.8g/cm3。
The invention provides aThe density of the low solid phase high density completion fluid prepared by the preparation method can reach 2.4g/cm3(ii) a In addition, the high-temperature high-pressure high-corrosion-resistance high-performance high-temperature-resistant high-corrosion-resistance high-performance high-temperature-resistant deep well can be used for deep well development at high temperature and high; more importantly, the density of the low solid phase high density completion fluid reaches 2.4g/cm3After that, it still has better stability.
It should be noted that, in practical use, sodium bromide may be replaced by potassium chloride; the mixture obtained by mixing sodium bromide and potassium chloride according to the ratio of 1:1.5 is used for replacing single potassium chloride or sodium bromide, and the effect is more obvious and better.
To further verify the stability of the low solids phase, high density completion fluids prepared by the present invention, experiments were conducted using the low solids phase, high density completion fluid of example two.
The test method comprises the following steps: the low solid phase high density completion fluid prepared by the method of example two was selected and tested for viscosity at room temperature before and after standing at constant temperature.
1. The results of the fine iron powder sedimentation stability are shown in the following table:
Figure BDA0002839168260000101
Figure BDA0002839168260000111
2. the detection results of the stability of the micro-iron powder settled at normal temperature are shown in the following table:
date Time of standing Precipitation out of Condition of death by settling
XXXX.11.07 Day 0 0mL Is free of
XXXX.11.08 1 day 2mL Is free of
XXXX.11.09 2 days 2mL Is free of
XXXX.11.10 3 days 5mL Is free of
XXXX.11.11 4 days 8mL Is free of
XXXX.11.12 5 days 13mL Is free of
XXXX.11.13 6 days 16mL Is free of
XXXX.11.14 7 days 20mL Is free of
According to the test result, after the sample weighted by the micro iron powder is stood for 7 days at normal temperature, 20mL of liquid is separated out; after aging, no water is separated out, and no sedimentation phenomenon exists at the bottom, which shows that the micro iron powder can be used for system aggravation and has better stability.
In addition, the low solid phase high density completion fluid of example two, at 160 deg.C high temperature, constant temperature of normal pressure for 7 days, its density is 0.01-0.02g/cm different from that before the test3The density values differ less. The experimental groups were as follows:
Figure BDA0002839168260000112
Figure BDA0002839168260000121
the experimental result data are as follows:
Figure BDA0002839168260000122
the corrosion rate of the Cr13 steel sheet is less than 0.076mm/a when the low solid phase high density completion fluid is adopted to carry out corrosion detection on the Cr13 steel sheet, and the solid phase-free high density corrosion prepared by the method has the advantage of high corrosion resistance.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention. The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, it should be noted that any modifications, equivalents and improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (7)

1. The preparation method of the low solid phase high density completion fluid is characterized by comprising the following steps:
step 1: preparing base fluid of completion fluid, and adjusting the density of the base fluid of completion fluid to 1.8g/cm3；
Step 2: adding weighting agent into the base fluid of the completion fluid to ensure that the density of the base fluid of the completion fluid is from 1.8g/cm3Adjusted to 2.4g/cm3；
The step 1 comprises the following steps:
s1: putting the solid-free weighting agent and sodium bromide or potassium chloride into a stirrer according to the mass ratio of 1-2:1-4, stirring and mixing, dissolving the mixture in water, and stirring for 30-50min at the temperature of 40-45 ℃;
s2: after cooling, adding the sodium bicarbonate and the high-temperature-resistant modified imidazoline corrosion inhibitor into a stirrer, stirring and dissolving for 20-30min at the stirring temperature of 35-40 ℃ and at the stirring speed of 100-300 r/min;
s3: after stirring, keeping the temperature for 5-10 minutes, adding sodium sulfite, and stirring to complete the preparation of the base fluid of the completion fluid;
wherein the weighting agent in the step 2 is micro iron powder, and the mesh number of the micro iron powder is 4500-5500 meshes; adding the micro-iron powder into a stirring device for pressure stirring, wherein the stirring time is 40-60min, and the stirring temperature is 45-60 ℃.
2. The method of claim 1 for preparing a low solids, high density completion fluid, wherein: solid-free weighting agent, 40-50 parts of sodium bromide or potassium chloride, 2-3 parts of sodium bicarbonate and 0.5 part of high-temperature-resistant modified imidazoline corrosion inhibitor2 portions of sodium sulfite, 0.1 to 0.5 portion of sodium sulfite and enough water to ensure that the density of the base fluid of the completion fluid is 1.8g/cm3。
3. The method of claim 2, wherein the method comprises the steps of: solid-free weighting agent, 45 parts of sodium bromide or potassium chloride, 1.5 parts of sodium bicarbonate, 1 part of high-temperature-resistant modified imidazoline corrosion inhibitor and 0.3 part of sodium sulfite.
4. The method of claim 1 for preparing a low solids, high density completion fluid, wherein: s1 is prepared by mixing solid-free weighting agent and sodium bromide or potassium chloride at a mass ratio of 1.5:2, stirring, dissolving in water for 40min, and stirring at 43 deg.C.
5. The method of claim 1 for preparing a low solids, high density completion fluid, wherein: in S2, the stirring time is 25min, the stirring temperature is 38 ℃, and the stirring speed is 200 r/min.
6. The method of claim 1 for preparing a low solids, high density completion fluid, wherein: in S3, the heat preservation time is 6 min.
7. The method of claim 1 for preparing a low solids, high density completion fluid, wherein: in the step 2, the mesh number of the micro iron powder is 5000 meshes, and in the step, the stirring time is 45min and the stirring temperature is 50 ℃.
CN202011485253.4A 2020-12-16 2020-12-16 Preparation method of low-solid-phase high-density completion fluid Pending CN112608728A (en)

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