Anti-interference well cementation cement paste and application thereof

Abstract

The invention provides anti-interference well cementation cement paste and application. The well cementation cement paste comprises oil well cement, an anti-interference agent, a flocculating agent, a drag reducer, an early strength agent, a lattice expanding agent, a retarder and water. The well cementation cement slurry can be used as a well cementation cement sheath.

Description

Technical Field

[0001] The present invention relates to the field of oilfield development, and particularly to an anti-interference cement slurry for well cementing. Background Art

[0002] In the blocks developed by long-term stratified water injection, the injection-production well pattern is complex, there are many water injection zones, the interference between layers is large, the oil-water interval is small, the edge and bottom water are active, and the oil-water relationship is complex, which is extremely likely to cause the cement slurry for well cementing to be "eroded" and "dissolved and migrated" by formation water, resulting in a channeling path, affecting the well cementing quality and the life of oil wells.

[0003] At present, the conventional admixture compounding method is mainly used, and its function is single, and it mainly focuses on how to make the cement solidify quickly, without really solving the water invasion resistance of the cement slurry. Summary of the Invention

[0004] One aspect of the present invention provides an anti-interference cement slurry for well cementing, which includes oil well cement, an anti-interference agent, a flocculant, a drag reducer, an early strength agent, a lattice expander, a retarder and water.

[0005] In a specific embodiment, based on the mass of G-class oil well cement as 100 parts, the anti-interference agent is 3 to 8 parts, the flocculant is 1 to 4 parts, the drag reducer is 0.25 to 0.5 parts, the early strength agent is 1 to 3 parts, the lattice expander is 1 to 2 parts, the retarder is 0.3 to 0.7 parts, and the water is 42 to 44 parts.

[0006] In a specific embodiment, the oil well cement is G-class oil well cement.

[0007] In a specific embodiment, the anti-interference agent is KGR-1.

[0008] In a specific embodiment, the flocculant is KGR-2.

[0009] In a specific embodiment, the drag reducer is SWJZ-1.

[0010] In a specific embodiment, the early strength agent is FZQ-1. Among them, the early strength agent FZQ-1 is a mixture formed by calcium carbonate, triethanolamine and calcium sulfate in a mass ratio of 25:1:5.

[0011] In a specific embodiment, the lattice expander is OBT-JG.

[0012] In a specific embodiment, the retarder is GH-9.

[0013] In a specific embodiment, the anti-interference cement slurry for well cementing further includes an antifoaming agent.

[0014] The second aspect of the present invention provides an application of the anti-interference cement slurry according to any one of the first aspects of the present invention in a cement sheath containing fluid intrusion.

[0015] Advantages of the present invention:

[0016] In the cement slurry of the present invention, by adding the anti-interference agent KGR-1 and the flocculant KGR-2, the cement slurry can be directly in contact with water and washed with water, and it can also ensure that the components in the slurry stick together without segregation or dispersion. It can effectively avoid the erosion, dissolution and migration of formation water to the cement slurry during cementing and waiting for setting. Furthermore, it synergistically improves the anti-scouring and water invasion resistance of the cement slurry and ensures the strength of the formed cement stone, effectively improving the sealing effect of the cement sheath on the formation water.

[0017] In particular, the present invention unexpectedly discovers that the combined use of the anti-interference agent KGR-1 and the flocculant KGR-2 of the present invention also reduces the water loss of the cement slurry, playing a role in reducing water loss. At the same time, it also delays the thickening time of the cement slurry, playing a role in retarding setting. Description of the Drawings

[0018] Figure 1 Shows the microscopic structure of the anti-interference cement stone of Example 1.

[0019] Figure 2 Shows the microscopic structure diagram obtained by scanning the cement stone of Comparative Example 3 with a scanning electron microscope ZEISS EVO 10 type.

[0020] Figure 3 Shows the thickening curve of the anti-interference cement slurry of Example 1.

[0021] Figure 4 Shows the thickening curve of the anti-interference cement slurry of Example 2.

[0022] Figure 5 Shows the thickening curve of the anti-interference cement slurry of Example 4.

[0023] Figure 6 Shows the thickening curve of the cement slurry of Comparative Example 5. Detailed Embodiments

[0024] The present invention will be further described below in conjunction with embodiments. However, the embodiments of the present invention are only exemplary descriptions, and this implementation method does not constitute a limitation to the present invention under any circumstances.

[0025] Unless otherwise specified, the reagents in the embodiments of the present invention can be purchased through commercial channels.

[0026] Example 1

[0027] This embodiment provides an anti-interference cement slurry for well cementing applicable to long-term water injection development with fluid intrusion into the annulus during the well cementing process. The cement is G-class oil well cement. Based on the mass of G-class oil well cement as 100 parts, there are 44 parts of fresh water, 8.0 parts of anti-interference agent KGR-1 (liquid, purchased from Tianjin Zhongyou Boxin Engineering Technology Co., Ltd.), 4.0 parts of flocculant KGR-2 (solid, purchased from Tianjin Zhongyou Boxin Engineering Technology Co., Ltd.), 0.5 part of drag reducer SWJZ-1 (solid, purchased from Shandong Shengyou Well Cementing Engineering Technology Co., Ltd.), 3.0 parts of early strength agent FZQ-1, 2.0 parts of lattice expansion agent OBT-JG (solid, purchased from Shandong Wald Oilfield Technology Co., Ltd.), and 0.3 part of retarder GH-9.

[0028] The preparation method is as follows:

[0029] 1) Add G-class oil well cement, flocculant KGR-2, drag reducer SWJZ-1, early strength agent FZQ-1, and lattice expansion agent OBT-JG into a cleaned container to obtain a solid-phase mixture;

[0030] 2) Add anti-interference agent KGR-1, retarder GH-9, and water into the slurry cup of a mixer. Under the condition of low-speed stirring at 2000 r / min, add the solid-phase mixture into the slurry cup within 15 s. After all are added, carry out high-speed stirring at 4000 r / min for 50 s to mix evenly to prepare the well cementing slurry.

[0031] Example 2

[0032] This embodiment provides an anti-interference cement slurry for well cementing applicable to long-term water injection development with fluid intrusion into the annulus during the well cementing process. The cement is G-class oil well cement. Based on the mass of G-class oil well cement as 100 parts, there are 44 parts of fresh water, 6.0 parts of anti-interference agent KGR-1 (liquid, purchased from Tianjin Zhongyou Boxin Engineering Technology Co., Ltd.), 3.0 parts of flocculant KGR-2 (solid, purchased from Tianjin Zhongyou Boxin Engineering Technology Co., Ltd.), 0.4 part of drag reducer SWJZ-1 (solid, purchased from Shandong Shengyou Well Cementing Engineering Technology Co., Ltd.), 3.0 parts of early strength agent FZQ-1, 2.0 parts of lattice expansion agent OBT-JG (solid, purchased from Shandong Wald Oilfield Technology Co., Ltd.), and 0.4 part of retarder GH-9.

[0033] The preparation method is as follows:

[0034] 1) Add G-class oil well cement, flocculant KGR-2, drag reducer SWJZ-1, lattice expansion agent OBT-JG, and early strength agent FZQ-1 into a cleaned container to obtain a solid-phase mixture;

[0035] 2) Add the anti-interference agent KGR-1, the retarder GH-9 and water into the slurry cup of the mixer. Under the condition of low-speed stirring at 2000 r / min, add the solid-phase mixture into the slurry cup within 15 s. After all are added, carry out high-speed stirring at 4000 r / min for 50 s to mix evenly, and obtain the well cement slurry.

[0036] Example 3

[0037] This example provides an anti-interference well cement slurry applicable to long-term water injection development and with fluid intrusion into the annulus during the well cementing process. The cement is G-class oil well cement, taking 100 parts by mass of the G-class oil well cement as the basis, 42 parts of fresh water, 5.0 parts of the anti-interference agent KGR-1 (liquid, purchased from Tianjin Zhongyou Boxin Engineering Technology Co., Ltd.), 3.0 parts of the flocculant KGR-2 (solid, purchased from Tianjin Zhongyou Boxin Engineering Technology Co., Ltd.), 0.3 part of the drag reducer SWJZ-1 (solid, purchased from Shandong Shengyou Well Cementing Engineering Technology Co., Ltd.), 1.0 part of the early strength agent FZQ-1, 2.0 parts of the lattice expansion agent OBT-JG (solid, purchased from Shandong Wald Oilfield Technology Co., Ltd.), and 0.6 part of the retarder GH-9.

[0038] The preparation method is as follows:

[0039] 1) Add the G-class oil well cement, the flocculant KGR-2, the drag reducer SWJZ-1, the lattice expansion agent OBT-JG and the early strength agent FZQ-1 into a cleaned container to obtain a solid-phase mixture;

[0040] 2) Add the anti-interference agent KGR-1, the retarder GH-9 and water into the slurry cup of the mixer. Under the condition of low-speed stirring at 2000 r / min, add the solid-phase mixture into the slurry cup within 15 s. After all are added, carry out high-speed stirring at 4000 r / min for 50 s to mix evenly, and obtain the well cement slurry.

[0041] Example 4

[0042] This example provides an anti-interference well cement slurry applicable to long-term water injection development and with fluid intrusion into the annulus during the well cementing process. The cement is G-class oil well cement, taking 100 parts by mass of the G-class oil well cement as the basis, 42 parts of fresh water, 3.0 parts of the anti-interference agent KGR-1 (liquid, purchased from Tianjin Zhongyou Boxin Engineering Technology Co., Ltd.), 1.0 part of the flocculant KGR-2 (solid, purchased from Tianjin Zhongyou Boxin Engineering Technology Co., Ltd.), 0.25 part of the drag reducer SWJZ-1 (solid, purchased from Shandong Shengyou Well Cementing Engineering Technology Co., Ltd.), 1.0 part of the early strength agent FZQ-1, 2.0 parts of the lattice expansion agent OBT-JG (solid, purchased from Shandong Wald Oilfield Technology Co., Ltd.), and 0.7 part of the retarder GH-9.

[0043] The preparation method is as follows:

[0044] 1) Add G-class oil well cement, flocculant KGR-2, drag reducer SWJZ-1, early strength agent FZQ-1, and lattice expansion agent OBT-JG into a cleaned container to obtain a solid-phase mixture;

[0045] 2) Add anti-interference agent KGR-1, retarder GH-9, and water into the slurry cup of a blender. Under the condition of low-speed stirring at 2000 r / min, add the solid-phase mixture into the slurry cup within 15 s. After all are added, carry out high-speed stirring at 4000 r / min for 50 s to mix evenly to prepare the well cement slurry.

[0046] Comparative Example 1

[0047] The cement is G-class oil well cement. Based on the mass of G-class oil well cement as 100 parts, 44 parts of fresh water, 12.0 parts of anti-interference agent KGR-1 (liquid, purchased from Tianjin Zhongyou Boxin Engineering Technology Co., Ltd.), 0.5 part of drag reducer SWJZ-1 (solid, purchased from Shandong Shengyou Well Cementing Engineering Technology Co., Ltd.), 3.0 parts of early strength agent FZQ-1, 2.0 parts of lattice expansion agent OBT-JG (solid, purchased from Shandong Wald Oilfield Technology Co., Ltd.), and 0.3 part of retarder GH-9.

[0048] The preparation method is as follows:

[0049] 1) Add G-class oil well cement, drag reducer SWJZ-1, lattice expansion agent OBT-JG, and early strength agent FZQ-1 into a cleaned container to obtain a solid-phase mixture;

[0050] 2) Add anti-interference agent KGR-1, retarder GH-9, and water into the slurry cup of a blender. Under the condition of low-speed stirring at 4000 r / min, add the solid-phase mixture into the slurry cup within 15 s. After all are added, carry out high-speed stirring at 12000 r / min for 50 s to mix evenly to prepare the well cement slurry.

[0051] Comparative Example 2

[0052] The cement is G-class oil well cement. Based on the mass of G-class oil well cement as 100 parts, 44 parts of fresh water, 12.0 parts of flocculant KGR-2 (solid, purchased from Tianjin Zhongyou Boxin Engineering Technology Co., Ltd.), 0.5 part of drag reducer SWJZ-1 (solid, purchased from Shandong Shengyou Well Cementing Engineering Technology Co., Ltd.), 3.0 parts of early strength agent FZQ-1, 2.0 parts of lattice expansion agent OBT-JG (solid, purchased from Shandong Wald Oilfield Technology Co., Ltd.), and 0.3 part of retarder GH-9.

[0053] The preparation method is as follows:

[0054] 1) Add G-class oil well cement, flocculant KGR-2, drag reducer SWJZ-1, lattice expander OBT-JG, and early strength agent FZQ-1 into a cleaned container to obtain a solid-phase mixture;

[0055] 2) Add retarder GH-9 and water into the slurry cup of a blender. With low-speed stirring at 4000 r / min, add the solid-phase mixture into the slurry cup within 15 s. After all is added, perform high-speed stirring at 12000 r / min for 50 s to mix evenly, thus preparing the well cement slurry.

[0056] Comparative Example 3

[0057] The cement is G-class oil well cement. Based on the mass of G-class oil well cement as 100 parts, there are 44 parts of fresh water, 0.5 part of drag reducer SWJZ-1 (purchased from Shandong Shengyou Well Cementing Engineering Technology Co., Ltd.), 3.0 parts of early strength agent FZQ-1, 2.0 parts of lattice expander OBT-JG (purchased from Shandong Wald Oilfield Technology Co., Ltd.), and 0.3 part of retarder GH-9.

[0058] The preparation method is as follows:

[0059] 1) Add G-class oil well cement, drag reducer SWJZ-1, lattice expander OBT-JG, and early strength agent FZQ-1 into a cleaned container to obtain a solid-phase mixture;

[0060] 2) Add retarder GH-9 and water into the slurry cup of a blender. With low-speed stirring at 4000 r / min, add the solid-phase mixture into the slurry cup within 15 s. After all is added, perform high-speed stirring at 12000 r / min for 50 s to mix evenly, thus preparing the well cement slurry.

[0061] Comparative Example 4

[0062] The cement is G-class oil well cement. Based on the mass of G-class oil well cement as 100 parts, there are 42 parts of fresh water, 4.0 parts of anti-interference agent KGR-1 (liquid, purchased from Tianjin Zhongyou Boxin Engineering Technology Co., Ltd.), 0.3 part of drag reducer SWJZ-1 (solid, purchased from Shandong Shengyou Well Cementing Engineering Technology Co., Ltd.), 1.0 part of early strength agent FZQ-1, 2.0 parts of lattice expander OBT-JG (solid, purchased from Shandong Wald Oilfield Technology Co., Ltd.), and 0.7 part of retarder GH-9.

[0063] The preparation method is as follows:

[0064] 1) Add G-class oil well cement, drag reducer SWJZ-1, lattice expander OBT-JG, and early strength agent FZQ-1 into a cleaned container to obtain a solid-phase mixture;

[0065] 2) Add the anti-interference agent KGR-1, the retarder GH-9 and water into the slurry cup of the blender. Under the condition of low-speed stirring at 2000 r / min, add the solid-phase mixture into the slurry cup within 15 s. After all are added, carry out high-speed stirring at 4000 r / min for 50 s to mix evenly, and obtain the well cement slurry.

[0066] Comparative Example 5

[0067] The cement is G-class oil well cement. Based on the mass of G-class oil well cement as 100 parts, 42 parts of fresh water, 4.0 parts of the flocculant KGR-2 (solid, purchased from Tianjin Zhongyou Boxstar Engineering Technology Co., Ltd.), 0.25 parts of the drag reducer SWJZ-1 (solid, purchased from Shandong Shengyou Well Cementing Engineering Technology Co., Ltd.), 1.0 part of the early strength agent FZQ-1, 2.0 parts of the lattice expansion agent OBT-JG (solid, purchased from Shandong Wald Oilfield Technology Co., Ltd.), and 0.7 part of the retarder GH-9.

[0068] The preparation method is as follows:

[0069] 1) Add the G-class oil well cement, the drag reducer SWJZ-1, the lattice expansion agent OBT-JG and the early strength agent FZQ-1 into a cleaned container to obtain a solid-phase mixture;

[0070] 2) Add the flocculant KGR-2, the retarder GH-9 and water into the slurry cup of the blender. Under the condition of low-speed stirring at 2000 r / min, add the solid-phase mixture into the slurry cup within 15 s. After all are added, carry out high-speed stirring at 4000 r / min for 50 s to mix evenly, and obtain the well cement slurry.

[0071] Test Example 1

[0072] Microscopic morphology test of the well cement slurry

[0073] Pour the well cement slurries prepared in Examples 1 to 4 and Comparative Examples 1 to 5 into cement blocks of 50 mm×50 mm×50 mm, and cure them in a water bath at 80°C for 24 h respectively to obtain the well cement stones of Examples 1 to 4 and Comparative Examples 1 to 5.

[0074] After the cement stone specimens are broken on a press, select the small flaky fragments inside the specimens for drying treatment, and then scan and observe the well cement stone specimens of Examples 1 to 4 and Comparative Examples 1 to 5 with a scanning electron microscope ZEISS EVO 10 type. The microscopic structure photos of the well cement stones of Example 1 and Comparative Example 3 are shown in Figure 1 and Figure 2 .

[0075] According to Figure 1 and Figure 2From the comparison, it can be seen that compared with the cement sheath of the comparative example, the microstructure of the cement sheath of the example has changed significantly. The hydration products between particles are denser, the structural properties are better, and the compressive strength of the cement sheath is further improved, fully verifying the anti-interference ability and flocculation effect of the anti-interference agent; while Figure 2 The microstructure of the cement sheath of the comparative example is loose and porous, and there are large voids between the hydration products.

[0076] Test Example 2

[0077] Fluidity test of the cement slurry for well cementing

[0078] Pour the cement slurries for well cementing prepared in Examples 1 to 4 and Comparative Examples 1 to 5 into the slurry cups of a six-speed rotational viscometer respectively. Adjust the rotation speed of the viscometer, test and record the viscometer readings of the cement slurries at different rotation speeds. According to the formulas n = 3.32lg(Φ600 / Φ300) and k = (0.511 * Φ300) / 511 n Calculate the flow behavior index n and the consistency coefficient k, and the results are shown in Table 1.

[0079] Table 1

[0080] Example Flow index n Consistency coefficient k Example 1 0.61 0.81 Example 2 0.63 0.79 Example 3 0.64 0.83 Example 4 0.65 0.85 Comparative Example 1 0.77 1.09 Comparative Example 2 0.73 1.11 Comparative Example 3 0.85 1.73 Comparative Example 4 0.79 0.93 Comparative Example 5 0.80 0.85

[0081] According to the data in Table 1, it can be seen that compared with Comparative Examples 1 to 3 for Example 1, and compared with Comparative Examples 3 to 5 for Example 4, the flow behavior index of the cement slurries for well cementing prepared in Examples 1 to 4 is between 0.61 and 0.65, and the consistency coefficient is between 0.79 and 0.85, both less than 1, indicating good fluidity. It shows that the addition of the anti-interference agent KGR-1 and the flocculant KGR-2 improves the rheology of the cement slurry.

[0082] Test Example 3

[0083] Static filtration loss test of the cement slurry for well cementing

[0084] 1) Turn on the power supply of the heating jacket of the filter loss instrument and adjust the thermostat to 80 °C.

[0085] 2) Stir the cement slurries for well cementing prepared in Examples 1 to 4 and Comparative Examples 1 to 5 for 10 minutes respectively, and inject them into the slurry cups to the scale line respectively to leave room for expansion. Place a layer of filter paper on the "O" ring.

[0086] 3) Put the slurry cup into the heating jacket, adjust the voltage regulator to make the top pressure reach 6.9 MPa, collect the filtrate for 30 minutes, maintain the temperature fluctuation not exceeding 3.0 °C, and record the filtrate volume.

[0087] 4) Calculate the filtration loss according to the filtrate volume, and the results are shown in Table 2.

[0088] Table 2

[0089] Example API water loss / ml Example 1 23 Example 2 28 Example 3 30 Example 4 34 Comparative Example 1 56 Comparative Example 2 68 Comparative Example 3 130 Comparative Example 4 89 Comparative Example 5 93

[0090] According to the results in Table 2, in each example where the anti-interference agent KGR-1 and the flocculant KGR-2 were added but no fluid loss reducer was added, the fluid loss was significantly reduced compared to the comparative examples. By comparing Example 1 with Comparative Examples 1 to 3, and Example 4 with Comparative Examples 3 to 5, after using the anti-interference agent KGR-1 and the flocculant KGR-2, the water loss was significantly reduced, indicating that the addition of the anti-interference agent KGR-1 and the flocculant KGR-2 effectively reduced the water loss of the cement slurry.

[0091] Test Example 4

[0092] Mechanical property test of well cement stone

[0093] (1) The onshore curing steps for compressive strength are as follows:

[0094] Pour the well cement slurries prepared in Examples 1 to 4 and Comparative Examples 1 to 5 into cement blocks of 50mm×50mm×50mm, cure them in a water bath at 80°C for 24h respectively, and conduct the compressive strength test on the cement blocks according to the method specified in SY / T6466—2016. After 24h of curing, measure the compressive strength of the cement blocks, and the results are shown in Table 3.

[0095] (2) The underwater curing steps for compressive strength are as follows:

[0096] Apply the release agent to the strength curing mold and place it in a water basin with the water surface covering the mold (not exceeding 1cm). Then, slowly pour the well cement slurries prepared in Examples 1 to 4 and Comparative Examples 1 to 5 into the mold from a height less than 2cm above the mold to form cement blocks of 50mm×50mm×50mm, cure them in a water bath at 80°C for 24h respectively, and conduct the compressive strength test on the cement blocks according to the method specified in SY / T6466—2016. The results are shown in Table 3.

[0097] Table 3

[0098]

[0099] According to the results in Table 3, compared with the comparative examples, for the cement slurries for well cementing in Examples 1 to 4 with the addition of anti-interference agent KGR-1 and flocculant KGR-2, the water-land strength ratio of the hardened cement is greater than that of the comparative examples without the addition of anti-interference agent KGR-1 and / or flocculant KGR-2. This indicates that the addition of anti-interference agent KGR-1 and flocculant KGR-2 enhances the scouring resistance of the cement slurry to external invading fluids, and the cement slurry system has very strong cohesiveness or anti-interference ability. In addition, when comparing Example 1 with Comparative Examples 1 and 2, and Example 4 with Comparative Examples 4 and 5, the water-land strength ratios of the hardened cement with only anti-interference agent KGR-1 or flocculant KGR-2 used alone are not as high as those with both components used simultaneously, indicating that there is a synergistic effect between anti-interference agent KGR-1 and flocculant KGR-2 in terms of the technical effects of this application.

[0100] Test Example 5

[0101] Thickening property test of cement slurry for well cementing

[0102] It was carried out with reference to the method for measuring the consistency test of fixed cement slurry specified in Section 9 of GB / T 19139-2012 "Test Methods for G-Class Oil Well Cement".

[0103] The cement slurries for well cementing prepared in Examples 1 to 4 and Comparative Examples 1 to 5 were respectively filled into the slurry cups of a pre-assembled high-temperature and high-pressure thickening instrument until the liquid level reached the scale line. After assembling the slurry cups, the slurry cups were placed into the autoclave body of the high-temperature and high-pressure thickening instrument according to the operation method. The motor was turned on, the autoclave lid was tightened, the thermocouple was inserted, and then the oil was fed. Then, according to the test temperature simulated for the cement slurry in the well cementing design, it was set to 85 °C, and the pressure condition was set to 21 MPa. After the thickening oil filled the autoclave body, the screws were tightened, the programs and parameters required for the experiment were set, the program was started, the corresponding switch buttons were turned on, and the thickening test of the cement slurry was started. The test results are shown in Table 4. Among them, the thickening curves of Example 1, Example 2, Example 4 and Comparative Example 5 are shown in Figures 3 to 6 .

[0104] Table 4

[0105] Example Gelation time / min × 21 MPa × 85 °C Example 1 125 Example 2 123 Example 3 107 Example 4 90 Comparative Example 1 82 Comparative Example 2 79 Comparative Example 3 67 Comparative Example 4 81 Comparative Example 5 83

[0106] According to the results in Table 4, it can be seen that for the cement slurry systems prepared in Examples 1 to 4, under the conditions of 80 °C and 21 MPa, the thickening time of the cement slurries in the examples with the addition of anti-interference agent KGR-1 and flocculant KGR-2 was extended compared with that of the comparative examples without the addition of anti-interference agent KGR-1 and / or flocculant KGR-2. This indicates that anti-interference agent KGR-1 and flocculant KGR- will, to a certain extent, delay the hydration reaction rate of the cement, and will not cause flocculation and flash setting of the cement slurry system, thus ensuring the safety of on-site construction.

Claims

1. A kind of anti-interference cement slurry for well cementing, which comprises well cement, anti-interference agent, flocculant, drag reducer, early strength agent, lattice expander, retarder and water.

2. The anti-interference cement slurry for well cementing according to claim 1, wherein Based on 100 parts by mass of the well cement, 3 to 8 parts of anti-interference agent, 1 to 4 parts of flocculant, 0.25 to 0.5 parts of drag reducer, 1 to 3 parts of early strength agent, 1 to 2 parts of lattice expander, 0.3 to 0.7 parts of retarder, and 42 to 44 parts of water.

3. The anti-interference cement slurry for well cementing according to claim 1, wherein The well cement is G-class well cement.

4. The anti-interference cement slurry for well cementing according to claim 1, wherein, The anti-interference agent is KGR-1.

5. The anti-interference cement slurry for well cementing according to claim 1, wherein The flocculant is KGR-2.

6. The anti-interference cement slurry for well cementing according to claim 1, characterized in that, The drag reducer is SWJZ-1.

7. The anti-interference cement slurry for well cementing according to claim 1, wherein The early strength agent is FZQ-1.

8. The anti-interference cement slurry for well cementing according to claim 1, wherein, The lattice expander is OBT-JG.

9. The anti-interference cement slurry for well cementing according to claim 1, wherein The retarder is GH-9.

10. The application of the anti-interference cement slurry for well cementing according to any one of claims 1 to 9 in use as a well cementing ring containing fluid intrusion.

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