CN114774092B - Drilling protection composition and drilling protection liquid - Google Patents
Drilling protection composition and drilling protection liquid Download PDFInfo
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- CN114774092B CN114774092B CN202111539404.4A CN202111539404A CN114774092B CN 114774092 B CN114774092 B CN 114774092B CN 202111539404 A CN202111539404 A CN 202111539404A CN 114774092 B CN114774092 B CN 114774092B
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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
- C09K8/02—Well-drilling compositions
- C09K8/04—Aqueous well-drilling compositions
- C09K8/14—Clay-containing compositions
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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
- C09K8/02—Well-drilling compositions
- C09K8/04—Aqueous well-drilling compositions
- C09K8/14—Clay-containing compositions
- C09K8/16—Clay-containing compositions characterised by the inorganic compounds other than clay
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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
- C09K8/02—Well-drilling compositions
- C09K8/04—Aqueous well-drilling compositions
- C09K8/14—Clay-containing compositions
- C09K8/18—Clay-containing compositions characterised by the organic compounds
- C09K8/20—Natural organic compounds or derivatives thereof, e.g. polysaccharides or lignin derivatives
- C09K8/206—Derivatives of other natural products, e.g. cellulose, starch, sugars
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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
- C09K8/02—Well-drilling compositions
- C09K8/04—Aqueous well-drilling compositions
- C09K8/14—Clay-containing compositions
- C09K8/18—Clay-containing compositions characterised by the organic compounds
- C09K8/22—Synthetic organic compounds
- C09K8/24—Polymers
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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
- 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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- 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
- C09K2208/34—Lubricant additives
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Abstract
The invention relates to a drilling protection composition and drilling protection liquid, and belongs to the technical field of drilling liquid. The drilling protection composition provided by the invention comprises a weighting agent and the following components in parts by weight: 1-5 parts of bentonite, 0.1-0.5 part of a zwitterionic polymer coating agent, 0.1-5 parts of a polymer coating inhibitor, 0.1-5 parts of an acrylamide-sodium acrylate copolymer, 1-5 parts of high-viscosity carboxymethyl cellulose sodium salt, 5-15 parts of potassium chloride, 1-5 parts of ammonium salt, 1-5 parts of low-viscosity carboxymethyl cellulose sodium salt, 1-5 parts of a high-temperature-resistant salt collapse-resistant filtrate reducer KFH-1 1-5 parts for drilling fluid, 1-5 parts of sulfonated phenolic resin, 1-5 parts of cationic asphalt powder, 1-5 parts of white asphalt, 1-5 parts of emulsified asphalt, 1-5 parts of white oil, 1-5 parts of emulsified paraffin and 1-5 parts of a solid lubricant. The drilling protection composition provided by the invention can be used for preparing high-density drilling fluid protection liquid with good stability.
Description
Technical Field
The invention relates to a drilling protection composition and drilling protection liquid, and belongs to the technical field of drilling liquid.
Background
Drilling fluid is a fluid that cleans cuttings at the bottom of the well during drilling, carries the cuttings to the surface, and maintains the drilling operation. The drilling fluid is mainly used in the following aspects: 1) And (5) removing rock debris at the bottom of the well. Along with the continuous drilling process, drill cuttings drilled at the bottom of a well are carried to the ground by using drilling fluid in time, so that the drill speed and the drill sticking accidents are improved. 2) Cooling, lubricating the drill bit and drill string. During the drilling process, the drill bit rubs with stratum rock, heat can be generated when the drill string rubs with the borehole wall rock, and the drilling fluid has lubricity and absorbs heat. The torque is reduced, the service life of the drill bit is prolonged, the pumping pressure is reduced, and the drilling speed is improved. 3) Wall building properties. Because of the pressure difference between the bottom hole pressure and the stratum pressure, the well drilling fluid with good performance forms a layer of filter cake with much lower permeability than the stratum on the well wall, which is beneficial to consolidating the well wall and preventing the well wall from exploration. 4) And controlling the formation pressure. The drilling fluid of a certain density creates a hydrostatic column pressure for balancing or controlling formation pressure. 5) Suspending drill cuttings and weighting material. The good drilling fluid has shear force after circulation is stopped, has the capability of suspending drill cuttings and weighting materials, or else, the solid phase particles sink to the bottom of the well, so that repeated grinding and sand setting and drill sticking at the bottom of the well are caused. 6) And acquiring data of the drilled stratum. And the rock scraps carried by the drilling fluid and oil gas in the drilling are analyzed, so that whether the drilled stratum has oil gas resources can be judged, and information such as stratum lithology, stratum water property and the like can be obtained. 7) Delivering water power. The drilling fluid circulation transfers the water power of useful work from the surface to the drill bit and bottom hole assembly. Since most drilling fluids are heterogeneous, dispersed, non-newtonian fluids, their flow behavior is complex, involving the physicochemical-mechanical properties of the fluid itself. Drilling fluids of different compositions and different additive ratios have different application effects on different formations.
At present, wei Gang fault block oil reservoirs of Henan oil fields have the defects that the geological structure is complex, high-pressure fluid, a gas layer, faults, folds and other factors which are unfavorable for drilling are longitudinally distributed due to large geological movement change, overflow, kick and other complex conditions are extremely easy to occur in the drilling process, along with the improvement of the density of drilling fluid, the upper weak stratum is easy to leak out, the normal drilling is difficult to maintain in the kick up, the performance of the existing drilling fluid is unstable, drilling faults such as sticking drilling are easy to cause, the geological purpose cannot be effectively realized, and the development of the oil fields is restricted.
Disclosure of Invention
The invention aims to provide a drilling protection composition which can be used for preparing high-density drilling protection liquid with good stability.
The invention also provides a drilling protection fluid adopting the drilling protection composition.
In order to achieve the above object, the drilling protection composition of the present invention adopts the following technical scheme:
a drilling protection composition consists of weighting agents and the following components in parts by weight: 1-5 parts of bentonite, 0.1-0.5 part of a zwitterionic polymer coating agent, 0.1-0.5 part of a polymer coating inhibitor, 0.1-5 parts of an acrylamide-sodium acrylate copolymer, 1-5 parts of high-viscosity carboxymethyl cellulose sodium salt, 5-15 parts of potassium chloride, 1-5 parts of ammonium salt, 1-5 parts of low-viscosity carboxymethyl cellulose sodium salt, 1-5 parts of a high-temperature-resistant salt-resistant collapse-resistant filtrate reducer KFH-1 1 for drilling fluid, 1-5 parts of sulfonated phenolic resin, 1-5 parts of cationic asphalt powder, 1-5 parts of white asphalt, 1-5 parts of emulsified asphalt, 1-5 parts of white oil, 1-5 parts of emulsified paraffin and 1-5 parts of a solid lubricant; the viscosity of the high-viscosity sodium carboxymethyl cellulose salt is 30 mPa.s-36 mPa.s, and the viscosity of the low-viscosity sodium carboxymethyl cellulose salt is 9 mPa.s-15 mPa.s.
The drilling protection composition provided by the invention can be used for preparing high-density drilling fluid protection liquid with good stability. The bentonite plays roles of slurry making and wall protection in the engineering drilling process, can also play roles of balancing the earth surface pressure, stabilizing the well wall and flushing rock scraps attached to the drilling tool, keeps the drilling tool clean and tidy, and the adhesiveness of the bentonite can permeate into gaps of the well wall to play a role of bonding, and meanwhile, the slurry of the bentonite can suspend and carry drill cuttings at the bottom of a hole out of a wellhead, so that the well wall of the completed construction is kept clean. The anionic, cationic and nonionic groups of the amphoteric ion polymer coating agent are led on the same molecular chain, so that the amphoteric ion polymer coating agent has the effects of inhibiting rock debris dispersion and increasing the viscosity of drilling fluid, has strong capacity of resisting rock dust pollution, is easy to purify after being polluted by the rock dust, can reduce the content of submicron particles in a system, is beneficial to improving the mechanical drilling speed and protecting a production layer, can greatly reduce the cost of drilling mud, and improves the comprehensive economic benefit. The acrylamide and sodium acrylate copolymer can electrically neutralize suspended particles with positive charges, has strong adsorption and bridging effects, can promote sedimentation, strengthen solid-liquid separation and has remarkable flocculation effect. The sodium carboxymethyl cellulose has the functions of adhesion, thickening, strengthening, emulsifying, water retention, suspension and the like. The potassium chloride and ammonium salts have the effect of preventing swelling of the formation clay. The sulfonated phenolic resin is a temperature-resistant and salt-resistant filtrate reducer for drilling fluid, is powdery, can resist high temperature and water loss, has the functions of preventing collapse and controlling viscosity, and has good salt resistance. The white oil and the emulsified paraffin drilling fluid play a role in lubrication. The cationic asphalt powder has good water dispersibility, no coalescence and floatation phenomena, excellent shale inhibition, asphalt insoluble substances dispersed in drilling fluid can be adsorbed on the surface of shale to form a thin, tough and low-permeability hydrophobic oil film, stratum pores and microcracks can be plugged under the action of pressure difference, the amount of filtrate which invades the stratum is reduced, cationic groups have good inhibition effect, the hydration and expansion of shale are effectively inhibited, the spalling and collapse of the shale are prevented, and the well wall is stabilized; the oil-gas layer protection effect is good; the viscosity is not increased, and the method is particularly suitable for preparing high-density drilling and completion fluid; the thermal stability is good (> 220 ℃).
Preferably, the drilling protection composition consists of a weighting agent and the following components in parts by weight: 1-5 parts of bentonite, 0.1-0.5 part of a zwitterionic polymer coating agent, 0.1-0.5 part of a polymer coating inhibitor, 0.1-5 parts of an acrylamide-sodium acrylate copolymer, 1-2 parts of high-viscosity carboxymethyl cellulose sodium salt, 5-15 parts of potassium chloride, 1-5 parts of ammonium salt, 1-5 parts of low-viscosity carboxymethyl cellulose sodium salt, 1-5 parts of a high-temperature-resistant salt collapse-resistant filtrate reducer KFH-1 1-5 parts, 1-5 parts of sulfonated phenolic resin, 1-3 parts of cationic asphalt powder, 3-5 parts of white asphalt, 3-5 parts of emulsified asphalt, 1-5 parts of white oil, 3-5 parts of emulsified paraffin and 3-5 parts of a solid lubricant.
Preferably, the solid lubricant is a graphite-based solid lubricant.
Preferably, the ammonium salt is an organic ammonium salt. The organic ammonium salt is preferably a hydrolyzed polyacrylonitrile ammonium salt. The advantage of using hydrolyzed absolute ammonium acrylonitrile as the organic ammonium salt is NH 4 HPAN is prepared by hydrolyzing acrylic fiber filaments at high temperature and high pressure, and is pale yellow powder containing-COOH and-COONH 4 、-CONH 2 Groups such as-CN, etc., have a certain temperature resistance and salt resistance, and NH 4+ The shale has a certain anti-collapse effect due to the inlaying effect in shale.
Preferably, the weighting agent is heavy rock and/or iron ore. The density of the drilling fluid can be adjusted by taking barite and/or iron ore as weighting agents. The density of the barite is 4.2g/m 3 。
Preferably, the particle size of the weighting agent is 200 mesh to 325 mesh.
Preferably, the weight part of the weighting agent is 100-200 parts.
The technical scheme adopted by the drilling protection liquid is as follows:
a drilling protection fluid comprising water and the drilling protection composition described above.
The drilling protective liquid of the invention can be 1.5-2.5g/cm 3 The high-density drilling fluid system in the range overcomes the defects of large rheological property adjustment difficulty, high sedimentation stability requirement, high solid phase content, large mud cake thickness and filtration loss, large shaft friction coefficient and poor capability of resisting rock debris pollution of the conventional high-density drilling fluid.
Preferably, the mass ratio of water to the well protection composition is 100:117.3-276.5.
Preferably, the preparation method of the drilling protection fluid comprises the following steps:
1) Uniformly mixing bentonite, potassium chloride, ammonium salt and solid lubricant with water, and then preserving heat at 55-65 ℃ for 20-30min to obtain a solution A;
2) Uniformly mixing the solution A with cationic asphalt powder, white asphalt, emulsified asphalt, white oil lubricant, emulsified paraffin and zwitterionic polymer coating agent to obtain a solution B;
3) Pressurizing the solution B to 5-10MPa in a closed container, keeping the temperature of the solution B at 55-65 ℃, adding a zwitterionic polymer coating agent, a high polymer coating inhibitor, an acrylamide-sodium acrylate copolymer, high-viscosity sodium carboxymethyl cellulose and low-viscosity sodium carboxymethyl cellulose, and uniformly mixing to obtain a solution C;
4) Adding the high-temperature-resistant salt-resistant collapse-resistant filtrate reducer KFH-1, the sulfonated phenolic resin and the weighting agent into the solution C, and uniformly mixing to obtain the anti-collapse high-temperature-resistant salt-resistant filtrate reducer KFH-1.
Further, in the step 1), bentonite, potassium chloride, ammonium salt and solid lubricant are sequentially added into water under the condition of stirring the water, and stirring is continued for a period of time. In the step 1), the stirring rotating speed is 10000r/min. The stirring time in step 1) was 20min.
In step 2), the cationic asphalt powder, white asphalt, emulsified asphalt, white oil lubricant, emulsified paraffin and zwitterionic polymer coating agent are added into the solution A in turn under the condition of stirring the solution A, and stirring is continued for a period of time. In the step 2), the stirring rotating speed is 10000r/min. And 2) continuing stirring for 20min. In the step 2), the stirring is that the system is stirred uniformly at 55-65 ℃.
In step 3), the zwitterionic polymer coating agent, the polymer coating inhibitor, the copolymer of acrylamide and sodium acrylate, the sodium salt of high-viscosity carboxymethyl cellulose and the sodium salt of low-viscosity carboxymethyl cellulose are added into the solution B in sequence under the condition of stirring the solution B, and stirring is continued for a period of time. In the step 3), the stirring rotating speed is 15000r/min. The stirring time in step 3) was 20min.
In step 4), the high temperature-resistant salt-resistant anti-collapse filtrate reducer KFH-1, sulfonated phenolic resin and weighting agent are sequentially added into the solution C under the condition of stirring the solution C, and stirring is continued for a period of time. In the step 4), the stirring rotating speed is 10000r/min. The stirring time in step 4) was 20min.
Detailed Description
The technical scheme of the invention is further described below with reference to the specific embodiments.
Examples and comparative examples adopt bentonite, potassium chloride, sulfonated phenolic resin, white pitch, cationic pitch powder, emulsified pitch, white oil lubricant, emulsified paraffin wax, graphite solid lubricant, low-viscosity carboxymethyl cellulose sodium salt, high-temperature-resistant salt-resistant anti-collapse filtrate reducer KFH-1 for drilling fluid, high-viscosity carboxymethyl cellulose sodium salt, polymer coating inhibitor, acrylamide and sodium acrylate copolymer and zwitterionic polymer coating agent, which are all commercially available products. Wherein the viscosity of the high-viscosity sodium carboxymethyl cellulose salt is 30 mPa.s-36 mPa.s, and the viscosity of the low-viscosity sodium carboxymethyl cellulose salt is 9 mPa.s-15 mPa.s.
The high temperature resistant, salt resistant and collapse resistant filtrate reducer KFH-1 is produced by the national east Xingjia mud materials Co. The polymer coating inhibitor is a natural polymer strong coating inhibitor purchased from Puyang Xinyuan environmental protection technology limited company; the zwitterionic polymer coating agent is a drilling zwitterionic polymer strong coating agent FA-367, and is purchased from Gu Yangxian Longquan chemical plant.
Example 1
The drilling protection composition of the embodiment comprises the following components in parts by weight: 1 part of bentonite, 0.1 part of a zwitterionic polymer coating agent, 0.1 part of a polymer coating inhibitor, 0.1 part of an acrylamide-sodium acrylate copolymer, 1 part of high-viscosity carboxymethyl cellulose sodium salt, 15 parts of potassium chloride, 1 part of ammonium salt, 1 part of low-viscosity carboxymethyl cellulose sodium salt, 1 part of a high-temperature-resistant salt collapse-resistant filtrate reducer KFH-1 1 part, 1 part of sulfonated phenolic resin, 1 part of cationic asphalt powder, 5 parts of white asphalt, 5 parts of emulsified asphalt, 5 parts of a white oil lubricant, 5 parts of emulsified paraffin, 5 parts of a graphite solid lubricant and 100 parts of a weighting agent; wherein the weighting agent is heavy stone with granularity of 200-325 meshes; the ammonium salt used is a hydrolyzed polyacrylonitrile ammonium salt.
Example 2
The drilling protection composition of the embodiment comprises the following components in parts by weight: 3 parts of bentonite, 0.2 part of a zwitterionic polymer coating agent, 0.3 part of a polymer coating inhibitor, 0.3 part of an acrylamide-sodium acrylate copolymer, 2 parts of high-viscosity carboxymethyl cellulose sodium salt, 10 parts of potassium chloride, 3 parts of ammonium salt, 2 parts of low-viscosity carboxymethyl cellulose sodium salt, 3 parts of a high-temperature-resistant salt collapse-resistant filtrate reducer KFH-1 3 part, 3 parts of sulfonated phenolic resin, 3 parts of cationic asphalt powder, 3 parts of white asphalt, 3 parts of emulsified asphalt, 3 parts of a white oil lubricant, 3 parts of emulsified paraffin, 3 parts of a graphite solid lubricant and 110 parts of a weighting agent; wherein the weighting agent is iron ore with granularity of 200-325 meshes; the ammonium salt used is a hydrolyzed polyacrylonitrile ammonium salt.
Example 3
The drilling protection composition of the embodiment comprises the following components in parts by weight: 5 parts of bentonite, 0.5 part of a zwitterionic polymer coating agent, 0.5 part of a polymer coating inhibitor, 5 parts of an acrylamide-sodium acrylate copolymer, 1 part of high-viscosity carboxymethyl cellulose sodium salt, 5 parts of potassium chloride, 5 parts of ammonium salt, 5 parts of low-viscosity carboxymethyl cellulose sodium salt, 5 parts of a high-temperature-resistant salt collapse-resistant filtrate reducer KFH-1 5 part, 5 parts of sulfonated phenolic resin, 1 part of cationic asphalt powder, 5 parts of white asphalt, 5 parts of emulsified asphalt, 5 parts of a white oil lubricant, 5 parts of emulsified paraffin, 5 parts of a graphite solid lubricant and 200 parts of a weighting agent; wherein the weighting agent is a mixture of heavy stone and iron ore, and the granularity is 200-325 meshes; the ammonium salt used is a hydrolyzed polyacrylonitrile ammonium salt.
Example 4
The drilling protecting composition of this example differs from the drilling protecting composition of example 1 only in that: the weight part of the weighting agent in the embodiment is 120 parts, the weighting agent consists of barite and iron ore, and the mass ratio of the barite to the iron ore is 100:20.
Example 5
The drilling protecting composition of this example differs from the drilling protecting composition of example 1 only in that: in the embodiment, the weight part of the weighting agent is 150 parts, the weighting agent consists of barite and iron ore, and the mass ratio of the barite to the iron ore is 120:30.
Example 6
The drilling protecting composition of this example differs from the drilling protecting composition of example 1 only in that: in the embodiment, the weight fraction of the weighting agent is 200 parts, the weighting agent consists of barite and iron ore, and the mass ratio of the barite to the iron ore is 20:180.
Example 7
The drilling protection fluid of this example consists of water and the drilling protection composition of example 1; the mass ratio of water to the drilling protection composition was 100:146.4.
The drilling protection fluid of the embodiment is prepared by a method comprising the following steps:
1) Taking the components of the drilling protection composition in the formula amount;
putting clear water into a stirrer, controlling the rotation speed of the stirrer to 10000r/min, sequentially adding bentonite, potassium chloride, ammonium salt and graphite solid lubricant, and continuing stirring for 20min after the addition to obtain a solution A;
2) Heating the solution A to 60 ℃, preserving heat at constant temperature for 25min, controlling the rotation speed of a stirrer to 10000r/min, sequentially adding cationic asphalt powder, white asphalt, emulsified asphalt, white oil lubricant, emulsified paraffin and zwitterionic polymer coating agent into the solution A, and continuously stirring for 20min to obtain a solution B;
3) Placing the prepared solution B in a closed container, pressurizing to 7.5MPa, controlling the temperature of the solution B to be 60 ℃, sequentially adding a zwitterionic polymer coating agent, a high polymer coating inhibitor, an acrylamide and sodium acrylate copolymer, high-viscosity carboxymethyl cellulose sodium salt and low-viscosity carboxymethyl cellulose sodium salt into the solution B under the condition that the rotation speed of the solution B is 15000r/min, and continuously stirring for 20min after the solution B is added to obtain solution C;
4) Sequentially adding the high-temperature-resistant salt-resistant collapse-resistant filtrate reducer KFH-1, the sulfonated phenolic resin and the weighting agent into the solution C under the condition of stirring the solution C at the rotating speed of 10000r/min, and continuously stirring for 20min after the adding is finished, thus obtaining the anti-salt anti-collapse filtrate reducer.
The density of the drilling protection fluid of this example was 1.5g/cm 3 。
Example 8
The drilling protection fluid of this example consists of water and the drilling protection composition of example 2; the mass ratio of water to the drilling protection composition was 100:146.5.
The preparation method of the drilling protection fluid in this embodiment is different from the preparation method of the drilling protection fluid in embodiment 7 only in that the adopted drilling protection composition is the drilling composition in embodiment 2, the mass ratio of water to the drilling protection composition is 100:146.5: in the step 2), the constant temperature and heat preservation time is 20min; in step 3), the pressure was increased to 5MPa during pressurization.
The density of the drilling protection fluid of this example was 1.6g/cm 3 。
Example 9
The drilling protection fluid of this example consists of water and the drilling protection composition of example 3; the mass ratio of water to the drilling protection composition was 100:237.3.
The preparation method of the drilling protection fluid in this embodiment is different from the preparation method of the drilling protection fluid in embodiment 7 only in that the adopted drilling protection composition is the drilling composition in embodiment 3, and the mass ratio of water to the drilling protection composition is 100:237.3: in the step 2), the constant temperature and heat preservation time is 30min; in step 3), the pressure was increased to 10MPa during pressurization.
The density of the drilling protection fluid of this example was 1.7g/cm 3 。
Example 10
The drilling protection fluid of this example consists of water and the drilling protection composition of example 4; the mass ratio of water to the drilling protection composition was 100:166.4. The method for preparing the drilling protection fluid of this embodiment is different from the method for preparing the drilling protection fluid of embodiment 7 only in that: 100 parts by weight of weighting agent added in the step 4) was replaced with 120 parts by weight of weighting agent composed of barite and iron ore (the mass ratio of barite to iron ore is 100:20). The density of the drilling protection fluid of this example was 2.05g/cm 3 。
Example 11
The drilling protection fluid of this example consists of water and the drilling protection composition of example 5; the mass ratio of water to the drilling protection composition was 100:196.4. The method for preparing the drilling protection fluid of this embodiment is different from the method for preparing the drilling protection fluid of embodiment 7 only in that: replacing 100 parts by weight of weighting agent added in the step 4)150 parts by weight of weighting agent consisting of barite and iron ore (weight ratio of barite to iron ore is 120:30). The density of the drilling protection fluid of this example was 2.30g/cm 3 。
Example 12
The drilling protection fluid of this example consists of water and the drilling protection composition of example 6; the mass ratio of water to the well protection composition was 100:246.4. The method for preparing the drilling protection fluid of this embodiment is different from the method for preparing the drilling protection fluid of embodiment 7 only in that: 100 parts by weight of weighting agent added in step 4) was replaced with 120 parts by weight of weighting agent composed of barite and iron ore (weight ratio of barite to iron ore is 20:180). The density of the drilling protection fluid of this example was 2.50g/cm 3 。
Comparative example 1
The drilling protection fluid of the comparative example consists of the following components in parts by weight: 100 parts of water, 2 parts of bentonite, 0.2 part of calcined soda, 0.8 part of polymer coating inhibitor, 1 part of RT-1, 2 parts of HFT, 1 part of ammonium salt, 3 parts of white oil, 2 parts of emulsified paraffin, 0.5-0.8 part of DSP, 1 part of GF-2 and 120 parts of weighting agent; wherein the weighting agent is iron ore and the ammonium salt is hydrolyzed polyacrylonitrile ammonium salt. When the drilling protection liquid of the comparative example is prepared, the components with the formula amount are taken and evenly mixed, and the drilling protection liquid is obtained. The density of the drilling protection fluid of this comparative example was 2.05g/cm 3 。
Comparative example 2
The drilling protection fluid of the comparative example consists of the following components in parts by weight: 100 parts of water, 2 parts of bentonite, 0.2 part of calcined soda, 0.8 part of polymer coating inhibitor, 1 part of RT-1, 2 parts of HFT, 1 part of ammonium salt, 3 parts of white oil, 2 parts of emulsified paraffin, 0.5-0.8 part of DSP, 1 part of GF-2 and 150 parts of weighting agent; wherein the weighting agent is iron ore and the ammonium salt is hydrolyzed polyacrylonitrile ammonium salt. When the drilling protection liquid of the comparative example is prepared, the components with the formula amount are taken and evenly mixed, and the drilling protection liquid is obtained. The density of the drilling protection fluid of this comparative example was 2.50g/cm 3 。
The RT-1, HFT, DSP and GF-2 used in the above comparative examples 1-2 are all commercial products, wherein RT-1 is a solid lubricant graphite RT-1 for drilling fluid purchased from the Ministry of civil right Dongxing slurry materials, HFT is a cationic emulsified asphalt HFT for drilling fluid purchased from the Ministry of oil science and technology, and DSP is a high temperature high salt filtrate reducer purchased from the Ministry of oil engineering, germany, and GF-2 is a multifunctional shielding temporary plugging agent of the Ministry of oil engineering, germany.
Experimental example 1
The drilling protection fluids of examples 10-12 and comparative examples 1-2 were tested for rheological properties according to GB/T29170-2012, laboratory test for drilling fluids for oil and gas industry, respectively.
The test results are shown in Table 1.
Table 1 rheological evaluation
As can be seen from the data in Table 1, the drilling fluid prepared from the drilling protection composition of example 1 has good rheological property and fluid loss wall forming property after being rolled at 120 ℃ for 16 hours, and the rheological property is in a reasonable range and has good rock carrying capacity.
Experimental example 2
Drilling protection fluid and clear water in examples 10-12 are respectively taken and respectively referred to GB/T29170-2012 laboratory test of drilling fluid for oil and gas industry for rock debris rolling recovery rate test and expansibility test.
Rock debris rolling recovery rate experiment: aging conditions: 16h×120 ℃, measurement temperature: room temperature.
Swelling experiment: 10g of on-site rock scraps are sieved by a 100-mesh sieve, dried at 105 ℃, pressed for 5min under 12MPa, and the expansion rates of the rock scraps in filtrate at 120 ℃ and 3.5MPa are measured by a CLPZ-2 high-temperature high-pressure intelligent expander.
The test results are shown in Table 2.
TABLE 2 evaluation of inhibitory properties
As can be seen from the data in table 2: the clear water of the recovery rate of the rock scraps is only 6.2%, which indicates that the rock samples have stronger hydration capacity, and the high-density drilling fluid system reaches 86.98% -87.3%; the linear expansion rate high-density drilling fluid system is only about 8.2 percent; the drilling protection fluid system of the embodiment has strong inhibition, effectively inhibits hydration dispersion and expansion of clay minerals, and maintains the stability of a well wall.
Experimental example 3
Mud cake viscosity coefficients and E-P lubrication coefficients of the drilling protection compositions of examples 10 to 12 and comparative examples 1 to 2 were measured according to GB/T29170-2012 laboratory test for drilling fluids for oil and gas industries, respectively, and the measurement results are shown in Table 3.
Table 3 lubricity evaluation
As can be seen from the data in table 3, the mud cake friction coefficient and the E-P lubrication coefficient of the drilling protection fluid using the drilling protection composition of example 1 were both less than 0.1, showing better lubricity.
Experimental example 4
The drilling protection fluids of example 9 and comparative example 2 were subjected to anti-cuttings pollution experiments according to GB/T29170-2012 laboratory test for drilling fluids for oil and gas industry, respectively. In the rock debris pollution resistance experiment, on-site rock debris is taken as a sample, and the aging condition is 16h multiplied by 120 ℃; the measurement temperature was room temperature, and the test results are shown in Table 4.
Table 4 evaluation of anti-contamination ability
As can be seen from the data in table 4, as the cuttings increase, the viscosity-shear of the system increases gradually, but the rise is smaller and the rheological properties are more stable. When the addition amount of drill cuttings is 5%, the dynamic cutting power YP rising rate is 14.3%; therefore, the system has stronger capability of resisting inferior solid phase pollution.
Experimental example 5
This experimental example the sedimentation stability of the drilling protection fluids of examples 10-12 and comparative examples 1-2 was evaluated in accordance with GB/T29170-2012 laboratory test for drilling fluids for the oil and gas industry.
The test results are shown in Table 5.
TABLE 5 evaluation of sedimentation stability
From the data in Table 5, after the drilling protection liquid of the experimental sample is static for 24 hours, the change of the drilling fluid density of the experimental sample is smaller than that of the control sample, which indicates that the system has good sedimentation stability and strong drilling fluid suspending capability.
Claims (6)
1. A drilling protection composition, characterized in that: consists of weighting agent and the following components in parts by weight: 1-5 parts of bentonite, 0.1-0.5 part of a zwitterionic polymer coating agent, 0.1-0.5 part of a polymer coating inhibitor, 0.1-5 parts of an acrylamide-sodium acrylate copolymer, 1-5 parts of high-viscosity carboxymethyl cellulose sodium salt, 5-15 parts of potassium chloride, 1-5 parts of ammonium salt, 1-5 parts of low-viscosity carboxymethyl cellulose sodium salt, 1-5 parts of a high-temperature-resistant salt-resistant collapse-resistant filtrate reducer KFH-1 1 for drilling fluid, 1-5 parts of sulfonated phenolic resin, 1-5 parts of cationic asphalt powder, 1-5 parts of white asphalt, 1-5 parts of emulsified asphalt, 1-5 parts of white oil, 1-5 parts of emulsified paraffin and 1-5 parts of a solid lubricant; the viscosity of the high-viscosity sodium carboxymethyl cellulose is 30 mPa.s-36 mPa.s, and the viscosity of the low-viscosity sodium carboxymethyl cellulose is 9 mPa.s-15 mPa.s;
the ammonium salt is hydrolyzed polyacrylonitrile ammonium salt; the weighting agent is heavy stone and/or iron ore; the weight part of the weighting agent is 100-200 parts.
2. The drilling protection composition of claim 1, wherein: the solid lubricant is a graphite solid lubricant.
3. The drilling protection composition of claim 1, wherein: the particle size of the weighting agent is 200-325 meshes.
4. A drilling protection fluid, characterized in that: a well protection composition as claimed in any of claims 1-3, comprising water.
5. The drilling protection fluid of claim 4, wherein: the mass ratio of water to the drilling protection composition is 100:117.3-276.5.
6. Drilling protection fluid according to claim 4 or 5, characterized in that: the method comprises the following steps:
1) Uniformly mixing bentonite, potassium chloride, ammonium salt and solid lubricant with water, and then preserving heat at 55-65 ℃ for 20-30min to obtain a solution A;
2) Uniformly mixing the solution A with cationic asphalt powder, white asphalt, emulsified asphalt, white oil lubricant, emulsified paraffin and zwitterionic polymer coating agent to obtain a solution B;
3) Pressurizing the solution B to 5-10MPa in a closed container, keeping the temperature of the solution B at 55-65 ℃, adding a zwitterionic polymer coating agent, a high polymer coating inhibitor, an acrylamide-sodium acrylate copolymer, high-viscosity sodium carboxymethyl cellulose and low-viscosity sodium carboxymethyl cellulose, and uniformly mixing to obtain a solution C;
4) Adding the high-temperature-resistant salt-resistant collapse-resistant filtrate reducer KFH-1, the sulfonated phenolic resin and the weighting agent into the solution C, and uniformly mixing to obtain the anti-collapse high-temperature-resistant salt-resistant filtrate reducer KFH-1.
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