Orifice toppling drill hole leaking stoppage cementing material as well as preparation method and use method thereof

Abstract

The invention belongs to the technical field of drilling engineering, and particularly relates to an orifice toppling drill hole plugging cementing material as well as a preparation method and a use method thereof. The cementitious material for leaking stoppage of the drilling hole during hole toppling is prepared from polyurethane polyurea, quick lime and polyethyleneimine. The preparation method comprises material preparation and stirring. The using method comprises the steps of quantification, rod lifting and dumping. According to the invention, the waterproof and anticorrosive polyurethane polyurea for the building surface is improved and introduced into the technical field of drilling engineering, so that the underwater use range of the waterproof and anticorrosive polyurethane polyurea is expanded; quick lime is adopted, so that the specific gravity can be increased, and certain foam inhibition capacity is achieved; polyethyleneimine is innovatively introduced as a foam inhibition material, the situation that a polyurethane polyurea base solution generates a large number of carbon dioxide bubbles when used underwater can be inhibited, and the defects that the base solution is desorbed from powder, the density is reduced, and floating is caused are overcome. The preparation method is simple, only orifice pouring is needed during use, and tedious and dangerous operations such as traditional pipe descending and slurry pumping for leaking stoppage are avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of drilling engineering, and in particular relates to a hole-dumping drilling plugging gelling material and a preparation method and a use method thereof. Background Art

[0002] During drilling construction, we often encounter complex situations such as borehole leakage, which has a great impact on material consumption, hole wall stability, drilling fluid quality, etc., greatly increasing construction costs and difficulty, and even seriously affecting construction safety. There are many traditional methods for plugging holes, which can be roughly divided into inert materials, cement slurry, chemical slurry, etc. Generally, it is necessary to put a perfusion pipe into the hole and use a mud pump to pump the plugging slurry to the predetermined hole section. Some of them require a special perfusion device. The main shortcomings of existing plugging technologies are summarized as follows:

[0003] (1) Inert material plugging is the most common method in construction. It is mixed with water to form a slurry, which is pumped or poured through the hole. It is plugged using the principle of high water loss bridging filling. Because it will not solidify and harden, it is relatively safe. However, it has disadvantages such as low pressure bearing capacity, large injection volume, and low success rate.

[0004] (2) Cement slurry plugging is more common. Cement is prepared into slurry according to a certain water-cement ratio. When necessary, early strength agent, water reducing agent, etc. are added. Generally, cement slurry is pumped into the predetermined hole section, and it consolidates and hardens after a period of time. This method has the advantages of convenient material acquisition and high consolidation strength, but it has the disadvantages of complicated injection process, high risk of buried drilling, easy to be polluted by groundwater, and long consumption time. Especially when plugging deep holes or plugging with cement slurry of the same diameter, the risk of accidents in the hole caused by the injection of cement slurry will increase exponentially, and it is rarely used in drilling holes over 1000m.

[0005] (3) Chemical slurry plugging involves many types of materials, which can be divided into chemical thickening plugging and chemical consolidation plugging. Among them, chemical thickening plugging is simple and safe to use. It is added to the drilling fluid for use, but its pressure bearing capacity is small and the success rate is low. It is suitable for some small leaks; while chemical consolidation plugging has the advantages of high consolidation strength and short consolidation time. It has similar disadvantages to cement slurry plugging, and the material cost and technical requirements are relatively higher. Some solutions need to be equipped with special injection devices due to the short consolidation time, so market promotion has not been good.

[0006] By analyzing the characteristics of existing plugging technologies, although all kinds of consolidable slurries can be used as optional solutions for drilling slurry plugging, the location of drilling leakage is generally below the surface, with a depth ranging from tens of meters to thousands of meters. There are severe challenges such as invisible and intangible, narrow operating space, humidity and even underwater consolidation, which is completely different from the simple and controllable surface consolidation environment. Drilling leakage does not mean that there is no water in the hole. In most cases, there is still a certain water level in the hole, but the resistance of the hole wall leakage channel is not enough to support the return of part or all of the drilling fluid to the hole mouth. Therefore, how to deliver the plugging slurry to the predetermined hole section in a safer, more convenient and less polluting way, and how to form a solid with higher consolidation strength in a short time, is the key problem that needs to be solved urgently in drilling plugging work. Summary of the invention

[0007] The purpose of the present invention is to overcome the disadvantages of the prior art and provide a preparation and use method of a hole-dumping drilling plugging gelling material.

[0008] The purpose of the present invention is achieved through the following technical solutions:

[0009] The first aspect of the present invention provides a hole-dumping drilling plugging gelling material, which comprises the following raw materials in parts by weight:

[0010] Polyurethane polyurea: 80-120, quicklime: 50-70,

[0011] Polyethyleneimine: 0.5~3,

[0012] Wherein, the weight ratio of the A liquid to the R liquid of the polyurethane polyurea is 1:3-5.

[0013] Further, it comprises the following raw materials in parts by weight:

[0014] Polyurethane polyurea: 85-100, quicklime: 55-62,

[0015] Polyethyleneimine: 1~2.5,

[0016] Wherein, the weight ratio of the A liquid to the R liquid of the polyurethane polyurea is 1:3.5-4.

[0017] As a preferred technical solution, it includes the following raw materials in parts by weight:

[0018] Polyurethane polyurea: 100, quicklime: 60,

[0019] Polyethyleneimine: 1,

[0020] Wherein, the weight ratio of the A liquid to the R liquid of the polyurethane polyurea is 1:4.

[0021] Furthermore, the quicklime is in powder form with a particle size of 200 mesh, that is, the particles can pass through a sieve with a pore size of 75 μm.

[0022] Furthermore, the polyurethane polyurea is a polyurea coating of GRT1308.

[0023] The second aspect of the present invention provides a method for preparing a hole-dumping drilling plugging gelling material, characterized in that it comprises the following steps:

[0024] S1. Prepare materials: weigh each raw material according to the formula ratio and set aside;

[0025] S2. Stirring: Take liquid A, liquid R of polyurethane polyurea and polyethyleneimine, mix and stir at a speed of 150-800 r / min for 100-150s. After stirring, add quicklime and continue stirring until evenly mixed.

[0026] A third aspect of the present invention provides a method for using a hole-opening pouring drilling plugging cementitious material, comprising the following steps:

[0027] A. Quantitative: Determine the amount of cementitious material used for hole-opening dumping and plugging according to the theoretical volume per meter of boreholes of different specifications and the length of the simulated consolidation hole section, and configure the cementitious material for hole-opening dumping and plugging on site;

[0028] B. Lifting the rod: lift all the drill rods in the hole, or lift the inner tube of the rope coring, and only lift the drill rod to 5-10m above the hole section to be grouted; C. Pouring: connect the clean water pipe to the hole mouth, pour the prepared plugging cementitious material, mix it with clean water and flow it into the hole. After pouring, wait for the cementitious material to fall to the bottom of the hole. If all the drill rods in the hole are lifted out, it is only necessary to wait for solidification for 5-10 hours before sweeping the hole and plugging is completed; if the drill rod is lifted above the hole section to be grouted, it is necessary to lift another drill rod 1.5-3m and wait for solidification.

[0029] Furthermore, the theoretical volumes per meter of boreholes of different specifications described in step A are BTW, NQ / NTW, HQ / HTW, PQ and SQ, and their theoretical volumes per meter of boreholes are 2.8L / m, 4.5L / m, 7.2L / m, 11.7L / m and 17.7L / m respectively.

[0030] Furthermore, the flow rate of the clean water in step C can refer to the recommended values ​​of different calibers, specifically: the drilling calibers are BTW, NQ / NTW, HQ / HTW, PQ and SQ, and the flow rates are 30-50 L / min, 40-70 L / min, 60-90 L / min, 90-110 L / min, and 100-130 L / min respectively.

[0031] The present invention has the following advantages:

[0032] (1) The present invention improves and introduces polyurethane polyurea, which is used as a waterproof and anti-corrosion agent for building surfaces, into the field of drilling construction technology, thereby expanding its scope of underwater use. Its ability to resist water pollution in holes is much higher than that of traditional cement slurries for plugging leaks, and it can achieve consolidation and hardening in a shorter time, so the amount used can be less. The use of quicklime can not only increase the specific gravity, but also has a certain foaming suppression ability. The innovative introduction of polyethyleneimine as a foaming suppression material can suppress the generation of a large number of carbon dioxide bubbles in the polyurethane polyurea base liquid when used underwater, thereby avoiding the disadvantages of desorption of the base liquid from the powder, reduced density and floating.

[0033] (2) The orifice-dumping drilling plugging cementitious material disclosed in the present invention is ready to use, has a simple preparation method, and is simple to use. It only needs to be poured into the orifice. This method requires the slurry to rely on its own performance to smoothly pass through the water line in the hole of tens of meters or even hundreds of meters to reach the leakage hole section, and can self-level to fill the hole wall crack cavity, and there is less residue on the hole wall in the non-leakage hole section. The whole process has little water intrusion and pollution, and the consolidation time is shortened as much as possible under the time conditions of the plugging operation to form a sufficiently high anti-leakage strength. It will be safer, more convenient and reliable when used in deep holes or ultra-deep holes, which provides the possibility of realizing an innovative way of orifice-dumping drilling plugging, and avoids the cumbersome and dangerous operations such as traditional down-pipe pumping slurry plugging. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 These are the pouring, self-leveling and shaping results of the formula slurry of Experimental Example 1, where a is pouring, b is self-leveling, and c is shaping after 2 hours.

[0035] Figure 2 These are the pouring, self-leveling and shaping results of the formula slurry of Experimental Example 2, where a is pouring, b is self-leveling, and c is shaping after 2 hours.

[0036] Figure 3 The pouring, self-leveling and shaping results of the formula slurry of Experimental Example 3 are shown in Figure 3, where a is pouring, b is self-leveling, and c is shaping after 2 hours.

[0037] Figure 4 These are the pouring, self-leveling and shaping results of the formula slurry of Experimental Example 4, where a is pouring, b is self-leveling, and c is shaping after 2 hours.

[0038] Figure 5 These are the pouring, self-leveling and shaping results of the formula slurry of Experimental Example 5, where a is pouring, b is self-leveling, and c is shaping after 2 hours.

[0039] Figure 6 These are the pouring, self-leveling and shaping results of the formula slurry of Experimental Example 6, where a is pouring, b is self-leveling, and c is shaping after 2 hours.

[0040] Figure 7 These are the pouring, self-leveling and shaping results of the formula slurry of Experimental Example 7, where a is pouring, b is self-leveling, and c is shaping after 2 hours.

[0041] Figure 8 These are the pouring, self-leveling and shaping results of the formula slurry of Experimental Example 8, where a is pouring, b is self-leveling, and c is shaping after 2 hours.

[0042] Fig. 9 These are the pouring, self-leveling and shaping results of the formula slurry of Experimental Example 9, where a is pouring, b is self-leveling, and c is shaping after 2 hours.

[0043] Fig.10 The figure is the experimental result of simulating the residual wellbore, where A is the simulated hole section with water level, B is the simulated hole section without water level and the inner wall of the drill casing, and C is the simulated hole section without water level and the wellbore rock. DETAILED DESCRIPTION

[0044] The present invention is further described below in conjunction with the accompanying drawings and embodiments. The protection scope of the present invention is not limited to the following: Embodiment 1: A hole pouring drilling plugging gelling material, which comprises the following raw materials in parts by weight:

[0045] Polyurethane polyurea: 80, quicklime: 50,

[0046] Polyethyleneimine: 0.5, wherein the weight ratio of the A liquid to the R liquid of the polyurethane polyurea is 1:3, and the quicklime is in powder form with a particle size of 200 meshes.

[0047] Embodiment 2: A hole-dumping drilling plugging gelling material, which comprises the following raw materials in parts by weight:

[0048] Polyurethane polyurea: 120, quicklime: 70,

[0049] Polyethyleneimine: 3,

[0050] The weight ratio of the A liquid to the R liquid of the polyurethane polyurea is 1:5, and the quicklime is in powder form with a particle size of 200 meshes.

[0051] Embodiment 3: A hole pouring drilling plugging gelling material, which comprises the following raw materials in parts by weight:

[0052] Polyurethane polyurea: 85, quicklime: 55,

[0053] Polyethyleneimine: 1,

[0054] The weight ratio of the A liquid to the R liquid of the polyurethane polyurea is 1:3.5, and the quicklime is in powder form with a particle size of 200 meshes.

[0055] Embodiment 4: A hole pouring drilling plugging gelling material, which comprises the following raw materials in parts by weight:

[0056] Polyurethane polyurea: 100, quicklime: 62,

[0057] Polyethyleneimine: 2.5,

[0058] The weight ratio of the A liquid to the R liquid of the polyurethane polyurea is 1:4, and the quicklime is in powder form with a particle size of 200 meshes.

[0059] Embodiment 5: A hole pouring drilling plugging gelling material, which comprises the following raw materials in parts by weight:

[0060] Polyurethane polyurea: 100, quicklime: 60,

[0061] Polyethyleneimine: 1,

[0062] The weight ratio of the A liquid to the R liquid of the polyurethane polyurea is 1:4, and the quicklime is in powder form with a particle size of 200 meshes.

[0063] Embodiment 6: A method for preparing a hole-dumping drilling plugging gelling material, comprising the following steps:

[0064] S1. Preparation: Weigh the raw materials according to the formula ratio of Example 1 and set aside;

[0065] S2. Stirring: Take liquid A, liquid R of polyurethane polyurea and polyethyleneimine, mix and stir at a speed of 150r / min for 150s. After stirring, add quicklime and continue stirring until evenly mixed.

[0066] Embodiment 7: A method for preparing a hole-dumping drilling plugging gelling material, comprising the following steps:

[0067] S1. Preparation: Weigh the raw materials according to the formula ratio of Example 3 and set aside;

[0068] S2. Stirring: Take liquid A, liquid R of polyurethane polyurea and polyethyleneimine, mix and stir at a speed of 800r / min for 100s. After stirring, add quicklime and continue stirring until evenly mixed.

[0069] Embodiment 8: A method for preparing a hole-dumping drilling plugging gelling material, comprising the following steps:

[0070] S1. Preparation: Weigh the raw materials according to the formula ratio of Example 5 and set aside;

[0071] S2. Stirring: Take liquid A, liquid R of polyurethane polyurea and polyethyleneimine, mix and stir at a speed of 600r / min for 125s. After stirring, add quicklime and continue stirring until evenly mixed.

[0072] Embodiment 9: A method for using a drilling plugging cementitious material by pouring it into a hole, comprising the following steps:

[0073] A. Quantitative: Determine the amount of cementitious material used for plugging and draining the borehole according to the theoretical volume per meter of different specifications of boreholes and the length of the intended consolidation borehole section, and configure the cementitious material used for plugging and draining the borehole on site; determine that the length of the intended plugging and draining consolidation borehole section is 10m, and the current borehole diameter is SQ, and calculate the required plugging slurry volume to be 177L;

[0074] B. Lifting the rod: Lift the inner tube of the rope coring, and only lift the drill rod to 5m above the hole section to be grouted, that is, 15m from the bottom of the hole;

[0075] C. Pouring: Connect a clean water pipe to the hole mouth with a clean water flow rate of 120 L / min, pour the plugging cementitious material prepared in Example 6, mix it with clean water and flow it into the hole. After pouring, wait for the cementitious material to fall to the bottom of the hole, then lift up a drill rod for 3 m, wait for it to solidify for 5 hours, and then sweep the hole to complete the plugging.

[0076] Embodiment 10: A method for using a drilling plugging cementitious material by pouring it into a hole, comprising the following steps:

[0077] A. Quantitative: Determine the amount of cementitious material used for plugging and draining the borehole according to the theoretical volume per meter of different specifications of boreholes and the length of the intended consolidation borehole section, and configure the cementitious material used for plugging and draining the borehole on site; determine that the length of the intended plugging and draining consolidation borehole section is 8m, and the current borehole diameter is PQ, and calculate the required plugging slurry volume to be 93.6L;

[0078] B. Lifting the rod: Lift the inner tube of the rope coring, and only lift the drill rod to 10m above the hole section to be grouted, that is, 18m from the bottom of the hole;

[0079] C. Pouring: Connect a clean water pipe to the hole mouth with a clean water flow rate of 100 L / min, pour the plugging cementitious material prepared in Example 7, mix it with clean water and flow it into the hole. After pouring, wait for the cementitious material to fall to the bottom of the hole, then lift up a drill rod for 3 m, wait for it to solidify for 10 hours, then sweep the hole, and the plugging is completed.

[0080] Embodiment 11: A method for using a drilling plugging cementitious material by pouring it into a hole, comprising the following steps:

[0081] A. Quantitative: Determine the amount of cementitious material used for plugging and draining the borehole according to the theoretical volume per meter of different boreholes and the length of the hole section to be consolidated, and configure the cementitious material for plugging and draining the borehole on site; determine that the length of the hole section to be plugged and drained is 15m, and the current borehole diameter is NTW, and calculate the required plugging slurry volume to be 67.5L;

[0082] B. Lifting the rod: Lift the inner tube of the rope coring, and only lift the drill rod to 8m above the hole section to be grouted, that is, 23m from the bottom of the hole;

[0083] C. Pouring: Connect a clean water pipe to the hole mouth with a clean water flow rate of 50 L / min, pour the plugging cementitious material prepared in Example 8, mix it with clean water and flow it into the hole. After pouring, wait for the cementitious material to fall to the bottom of the hole, then lift up a drill rod by 1.5 m, wait for it to solidify for 8 hours, and then sweep the hole to complete the plugging.

[0084] Embodiment 12: A method for using a drilling plugging cementitious material by pouring it into a hole, comprising the following steps:

[0085] A. Quantitative: Determine the amount of cementitious material used for plugging and draining the borehole according to the theoretical volume per meter of different boreholes and the length of the hole section to be consolidated, and configure the cementitious material for plugging and draining the borehole on site; determine that the length of the hole section to be plugged and drained is 20m, and the current borehole diameter is BTW, and calculate the required plugging slurry volume to be 56L;

[0086] B. Lifting rod: lift all the drill rods in the hole;

[0087] C. Pouring: Connect the clean water pipe to the hole mouth with a flow rate of 40L / min. Pour the prepared plugging cementitious material so that it mixes with the clean water and flows into the hole. After pouring, wait for the cementitious material to fall to the bottom of the hole, wait for it to solidify for 5 to 10 hours, then sweep the hole and the plugging is completed.

[0088] The beneficial effects of the present invention are described below by experiments:

[0089] 1. Performance requirements of chemical consolidation slurry

[0090] Chemical consolidation products that meet the requirements of hole pouring drilling plugging cementitious materials must meet the following performance requirements:

[0091] (1) The specific gravity of the drilling fluid or clean water in the hole is usually between 1.0 and 1.1. The specific gravity of the chemical consolidation slurry should be high enough to fall smoothly and quickly below the water level. The specific gravity should preferably exceed 1.5.

[0092] (2) The chemical consolidation slurry is not easily miscible with the water in the hole, so it can pass through a longer water line in the hole. If it is a hydrophobic material, the ability to resist water intrusion and pollution will be significantly improved;

[0093] (3) Chemically consolidated slurry does not easily react with water to reduce strength and density;

[0094] (4) The chemical consolidation slurry needs to have a certain fluidity so that it can self-level at the bottom of the hole and adaptively fill various crack cavities;

[0095] (5) Chemical consolidation slurry can be solidified in a relatively short time, and strive to reach the anti-leakage strength in 5 to 10 hours, which will have obvious advantages over conventional cement pouring;

[0096] (6) Chemical consolidation slurry can leave less residue on the borehole wall in the non-consolidated borehole sections with and without water level, and there are feasible measures.

[0097] 2. Basic material screening ideas

[0098] (1) Inert materials, cement slurry and some chemical slurries are all hydrophilic materials. In order to achieve better anti-water intrusion effect, hydrophobic chemical consolidation slurry materials are proposed.

[0099] (2) Traditional chemical consolidation slurry plugging materials include urea-formaldehyde resin, unsaturated polyester resin, polyurethane, etc., which are rarely used in actual drilling plugging, and are usually plugged by down-pipe injection;

[0100] (3) Urea-formaldehyde resin and unsaturated polyester resin are not considered as the basic materials of this scheme for the following reasons: ① Urea-formaldehyde resin is a water-soluble resin, which is formed by the condensation reaction of urea and formaldehyde to form methylene urea and precipitate water. Its chemical formula is expressed as: nH2NCONH2+nHCHO→[-CH2-NH-CO-NH-] n +nH2O, this process requires acid curing, the reaction time is adjustable, but it is easily contaminated by water, and generally requires a special injector; ② Unsaturated polyester resin is a cross-linking reaction between unsaturated dibasic acid and diol under the action of initiator and promoter. The initiator works on the principle of free radical reaction, and the required temperature is relatively high. Taking 301 polyester as an example, it needs to be heated to above 100°C and related operations are performed, and the process is cumbersome;

[0101] (4) The full name of polyurethane is polyurethane. There are many products, which can be roughly divided into the following three categories: polyurethane, polyurethane polyurea (hybrids, semi-polyurea), and polyurea (pure polyurea). The product characteristics are as follows: ① Polyurethane is a system in which the total content of terminal hydroxyl resin and terminal hydroxyl chain extender in the prepolymer and semi-prepolymer of component A and in the R component is not less than 80%, and a catalyst is required; ② Polyurethane polyurea (hybrids, semi-polyurea) is a system in which the total content of terminal amino resin and terminal amino chain extender in the prepolymer and semi-prepolymer of component A and in the R component is between 20% and 80%, and a catalyst can be added as needed; ③ Polyurea (pure polyurea) is a system in which the total content of terminal amino resin and terminal amino chain extender in the prepolymer and semi-prepolymer of component A and in the R component is not less than 80%, and no catalyst is added. The main products of polyurethane contain carbamate (-NH-COO-), and the main products of polyurea (pure polyurea) contain urea group (-NH-CO-NH-). The latter has better anti-corrosion, waterproof, strength and other properties. Polyurethane polyurea (hybrid, semi-polyurea) is between the two.

[0102] (5) Reasons for choosing polyurethane polyurea (hybrids, semi-polyurea) as the base material: ① The polyurethane reaction has a catalyst, which not only accelerates the reaction of the prepolymer or semi-prepolymer with the terminal hydroxyl resin, but also accelerates the reaction with water in the environment, generating a large number of carbon dioxide bubbles, which significantly reduces the strength and is not suitable for underwater use; ② Polyurea (pure polyurea) has no catalyst and hardly reacts with water in the environment. It reacts and loses fluidity too quickly, and the orifice pouring time is tight, and it is difficult to meet the fluidity required for self-leveling; ③ Polyurethane polyurea (hybrids, semi-polyurea) combines the advantages and disadvantages of the first two, and can be screened and optimized;

[0103] (6) Both the A component and the R group of polyurethane polyurea (hybrid, semi-polyurea) have certain hydrophobic properties, and the specific gravity of the mixed slurry is about 1.46. However, it has the property of reacting with water to generate carbon dioxide bubbles, which significantly reduces the specific gravity and strength. Surface use often requires a dry environment. At present, it cannot meet the harsh conditions for underwater use, and there is no precedent for its use. If the requirements for orifice pouring performance are to be met, optimization solutions such as adding materials to reduce costs, increasing specific gravity, and suppressing underwater foaming are required;

[0104] (6) The weighting material is to be selected from barite powder, quartz sand, and quicklime powder, among which barite powder has the largest specific gravity, quartz sand is relatively cheap and easy to obtain, and quicklime powder has the ability to react with carbon dioxide;

[0105] (7) Initial small sample tests of antifoaming materials, including defoamers B25, B450, B451, B452, B453, and B454, showed less than ideal results. Subsequently, MW600 polyethyleneimine was screened, but its effect needs further verification.

[0106] In order to more vividly compare the effects of the invention, relevant experimental cases were conducted, and the materials used included: (1) Consolidation material: polyurethane polyurea (hybrid, semi-polyurea), polyurea coating model GRT1308, component A and component R are both flowable liquids; (2) Weighting material: barite powder, quartz sand, quicklime powder; (3) Antifoaming material: polyethyleneimine, defoamer B25, all are flowable liquids. Prepare the slurry according to the following 9 embodiment formulas, the relevant data unit is g, stir evenly and pour into a water cup to make it sink to the bottom of the water. The amount of weighting material added to the formula must take into account the fluidity of the slurry. The SJY-800B penetration mortar strength tester was used to measure the consolidation strength at different times, and its final specific gravity was tested. The data are shown in Table 1 below; photos of pouring, self-leveling, and shaping after 2 hours are shown below. Figure 1-9 shown.

[0107] Experimental Example 1: GRT1308 A liquid + GRT1308 R liquid + barite powder = 20:80:50

[0108] Experimental Example 2: GRT1308 A solution + GRT1308 R solution + barite powder + defoamer B25 = 20:80:50:1

[0109] Experimental Example 3: GRT1308 A solution + GRT1308 R solution + barite powder + polyethyleneimine = 24:96:50:1

[0110] Experimental Example 4: GRT1308 A solution + GRT1308 R solution + barite powder + polyethyleneimine = 24:96:50:1.5

[0111] Experimental Example 5: GRT1308 A liquid + GRT1308 R liquid + quartz sand = 20:80:100

[0112] Experimental Example 6: GRT1308 A liquid + GRT1308 R liquid + quartz sand + polyethyleneimine = 20:80:100:1

[0113] Experimental Example 7: GRT1308 A liquid + GRT1308 R liquid + quartz sand + polyethyleneimine = 20:80:100:1.5

[0114] Experimental Example 8: GRT1308 A liquid + GRT1308 R liquid + quicklime powder = 20:80:60

[0115] Experimental Example 9: GRT1308 A solution + GRT1308 R solution + quicklime powder + polyethyleneimine = 20:80:60:1

[0116] Table 1 Consolidation strength and specific gravity data

[0117]

[0118]

[0119] It can be seen from Table 1 that: (1) With barite powder as the weighting material, the strength, specific gravity and other indicators of Experimental Example 4 are the best, but the required defoamer polyethyleneimine is too much; (2) With quartz sand as the weighting material, the strength, specific gravity and other indicators are not good, and there are obvious floating and desorption; (3) With quicklime powder as the weighting material, it has better indicators without adding defoamers. The effect of Experimental Example 9 is further improved after adding defoamers, and the early strength before 10 hours is also higher, which is conducive to quickly reaching the hole sweeping strength, saving the waiting time, and the cost of defoamers is also the lowest. Therefore, Experimental Example 9 is selected as the best solution. After determining the ingredients, the present invention also conducted experiments and finally determined the formula as follows: It includes the following raw materials in parts by weight:

[0120] Polyurethane polyurea: 80-120, quicklime: 50-70,

[0121] Polyethyleneimine: 0.5-3, wherein the weight ratio of the A liquid to the R liquid of the polyurethane polyurea is 1:3-5.

[0122] The optimal formula is: GRT1308 A liquid + GRT1308 R liquid + quicklime powder + polyethyleneimine = 20:80:60:1.

[0123] Depend on Figure 1-9 It can be seen that: (1) when barite powder is used as the weighting material, the volume expansion is obvious when no defoamer is added, and the volume expansion is reduced after the defoamer is added. The effect becomes better when the defoamer exceeds 1.5%; (2) when quartz sand is used as the weighting material, the effect is still very unsatisfactory when no defoamer is added or the defoamer is added to 1.5%; (3) when quicklime powder is used as the weighting material, the volume expands to a certain extent when no defoamer is added, and the volume expansion can be significantly suppressed by adding 1% defoamer; (4) The above formulas all meet the fluidity required for self-leveling.

[0124] 3. Well wall residue simulation test:

[0125] Chemical consolidation slurry also requires less residue on the borehole wall in the non-consolidated borehole sections with and without water level. According to Experimental Example 9, the borehole section with water, the borehole section without water (inner wall of the drill casing), and the borehole section without water (rock on the borehole wall) were simulated to test the slurry residue on the borehole wall. The simulated borehole wall residue experiment photos are shown in the figure. Fig.10 shown.

[0126] Depend on Fig.10 It can be seen that: (1) in the water hole section, there is little slurry residue on the well wall, and the slurry has strong resistance to water intrusion and pollution, and the water body remains clear after the slurry passes through; (2) in the waterless hole section, whether it is the inner wall of the drill casing or the well wall rock, as long as there is a small amount of flowing water, there is little slurry residue. When actually drilling and plugging leaks, the method of pouring the plugging slurry while connecting the water pipe to clean water can be adopted, so that there is no residue on the well wall and there is no fear of dilution and pollution by clean water.

[0127] 4. Examples of on-site use

[0128] When the invention is used to plug leaks at a drilling site, the following steps can be taken:

[0129] (1) Combined with the drilled core and drilling fluid loss data, determine the length of the planned plugging and consolidation hole section, such as 10m, and the current borehole diameter is HQ. According to Table 2, the required plugging slurry volume is 72L, and the total material mass is 108kg based on the specific gravity of about 1.5. Combined with the formula of Experimental Example 9, the material mass is calculated as follows: 13.4kg of GRT1308 A liquid, 53.7kg of GRT1308 R liquid, 40.2kg of quicklime powder, and 0.7kg of polyethyleneimine. Prepare the materials for use. If the formula of other experimental examples is used, the corresponding material mass needs to be adjusted.

[0130] (2) Lift out all the drill pipes in the hole, or lift out the inner tube of the rope coring, and only lift the drill pipe to 5 to 10 m above the hole section to be grouted;

[0131] (3) According to the calculated material mass, polyurea A liquid, polyurea R liquid and polyethyleneimine are first mixed and stirred evenly, and then quicklime powder is added and mixed and stirred evenly to prepare a slurry for standby use;

[0132] (4) Connect a clean water pipe to the hole mouth. When pouring the drilling plugging slurry, mix it with clean water and flow it into the hole. This can avoid residual slurry in the non-consolidated hole section. After pouring, wait for the gelled slurry to fall to the bottom of the hole, and then lift up one drill rod to make it enter a safer hole section.

[0133] (5) Depending on the consolidation strength of the surface samples, wait for about 5 to 10 hours before cleaning the hole, plugging the leak, and resuming drilling.

[0134] Table 2 Theoretical volume of drilling holes of different specifications

[0135] Specification BTW NQ / NTW HQ / HTW PQ SQ Theoretical drilling volume (L / m) 2.8 4.5 7.2 11.7 17.7

[0136] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which are all covered by the protection scope of the present invention.

Claims

1. A hole pouring drilling plugging cementitious material, characterized in that: It includes the following raw materials in parts by weight: Polyurethane polyurea: 80-120, quicklime: 50-70, Polyethyleneimine: 0.5~3, Wherein, the weight ratio of the A liquid to the R liquid of the polyurethane polyurea is 1:3-5.

2. The hole pouring drilling plugging cementitious material according to claim 1, characterized in that: It includes the following raw materials in parts by weight: Polyurethane polyurea: 85-100, quicklime: 55-62, Polyethyleneimine: 1~2.5, Wherein, the weight ratio of the A liquid to the R liquid of the polyurethane polyurea is 1:3.5-4.

3. The hole pouring drilling plugging cementitious material according to claim 1, characterized in that: It includes the following raw materials in parts by weight: Polyurethane polyurea: 100, quicklime: 60, Polyethyleneimine: 1, Wherein, the weight ratio of the A liquid to the R liquid of the polyurethane polyurea is 1:

4.

4. A hole pouring drilling plugging cementitious material according to claim 1, 2 or 3, characterized in that: The quicklime is in powder form with a particle size of 200 meshes.

5. A hole pouring drilling plugging cementitious material according to claim 1, 2 or 3, characterized in that: The polyurethane polyurea is a polyurea coating of GRT1308.

6. The method for preparing a hole-dumping drilling plugging cementitious material according to claim 1, characterized in that: It includes the following steps: S1. Prepare materials: weigh each raw material according to the formula ratio and set aside; S2. Stirring: Take liquid A, liquid R of polyurethane polyurea and polyethyleneimine, mix and stir at a speed of 150-800 r / min for 100-150s. After stirring, add quicklime and continue stirring until evenly mixed.

7. The method for using a hole-dumping drilling plugging cementitious material according to claim 1, characterized in that: The following steps are involved: A. Quantitative: Determine the amount of cementitious material used for hole-opening dumping and plugging according to the theoretical volume per meter of boreholes of different specifications and the length of the simulated consolidation hole section, and configure the cementitious material for hole-opening dumping and plugging on site; B. Lifting the rod: lift all the drill rods in the hole, or lift the inner tube of the rope coring, and only lift the drill rod to 5 to 10 meters above the hole section to be grouted; C. Pouring: Connect a clean water pipe to the hole mouth, pour the prepared plugging cementitious material, mix it with clean water and flow it into the hole. After pouring, wait for the cementitious material to fall to the bottom of the hole. If all the drill rods in the hole have been lifted out, it is only necessary to wait for solidification for 5 to 10 hours before sweeping the hole and plugging is completed. If the drill rod is lifted above the planned grouting hole section, it is necessary to lift another drill rod for 1.5 to 3 meters and wait for solidification.

8. The method for using a hole-dumping drilling plugging cementitious material according to claim 7, characterized in that: The theoretical volumes per meter of boreholes of different specifications described in step A are BTW, NQ / NTW, HQ / HTW, PQ and SQ, and their theoretical volumes per meter of boreholes are 2.8L / m, 4.5L / m, 7.2L / m, 11.7L / m and 17.7L / m respectively.

9. The method for using a hole-dumping drilling plugging cementitious material according to claim 7, characterized in that: The flow rate of the clean water in step C can refer to the recommended values ​​of different calibers, specifically: the drilling calibers are BTW, NQ / NTW, HQ / HTW, PQ and SQ, and the flow rates are 30-50L / min, 40-70L / min, 60-90L / min, 90-110L / min, and 100-130L / min respectively.

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