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Shielding diverting agent for drilling fluids

A technology for shielding temporary plugging agents and drilling fluids, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of unsatisfactory plugging effect, poor plugging effect, high use cost, etc., and achieve diaphragm pressure Good transferability, slow viscosity and static water dispersion, little effect on dispersion performance

Inactive Publication Date: 2011-02-16
陈清安
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the plugging effect of bridge frame and filling plugging agent is not very ideal, especially for plugging cracks, fissures and small and medium karst caves in a large area of ​​well wall; The effect is better, but its price is expensive and the cost of use is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1, the shielding temporary plugging agent for drilling fluid is prepared by mixing 50%wt middle molecular gel material and 50%wt fluid loss control material, and the middle molecular gel material is derived from Phoebe The fluid loss control material is made of 50%wt lignite, 10%wt anhydrous sodium sulfite, 10%wt sodium metabisulfite, 10%wt sodium hydroxide, 5%wt formaldehyde, 5%wt A condensate formed by reacting sodium carbonate and 10%wt chloroacetic acid at 100°C for 4-6 hours. Its condensate contains sulfonate group and carboxymethyl group.

[0022] The performance index of the shielding temporary plugging agent for drilling fluid after testing is:

[0023] 1. Appearance: gray free-flowing powder 2. Moisture %: 9.2

[0024] 3. Fineness: 0.75mm 4. Sieve residual %: 9%

[0025] 5. API filtration loss (ml): 4.3 6. Plugging speed (seconds): 17

[0026] 7. Closed fluid loss (ml): 22 8. PH value: 7

[0027] 9. Apparent viscosity (mpa.s): 9

[0028] 10. Fluor...

Embodiment 2

[0030] Example 2, the shielding temporary plugging agent for drilling fluid is prepared by mixing 40%wt medium molecular gel material and 60%wt fluid loss control material, and the medium molecular gel material is derived from Phoebe The fluid loss control material is made of 60%wt lignite, 7%wt anhydrous sodium sulfite, 8%wt sodium metabisulfite, 10%wt sodium hydroxide, 7%wt formaldehyde, 3%wt A condensate formed by reacting sodium carbonate and 5%wt chloroacetic acid at 100°C for 4-6 hours. Its condensate contains sulfonate group and carboxymethyl group.

[0031] The performance index of the shielding temporary plugging agent for drilling fluid after testing is:

[0032] 1. Appearance: gray free-flowing powder 2. Moisture %: 8.5

[0033] 3. Fineness: 0.71mm 4. Sieve residual %: 8.5%

[0034] 5. API filtration loss (ml): 4.7 6. Plugging speed (seconds): 15

[0035] 7. Closed fluid loss (ml): 26 8. PH value: 7.6

[0036] 9. Apparent viscosity (mpa.s): 8.5

[0037] 10. Fl...

Embodiment 3

[0039] Example 3, the shielding temporary plugging agent for drilling fluid is prepared by mixing 65%wt medium molecular gel material and 35%wt fluid loss control material, and the medium molecular gel material is derived from Phoebe The fluid loss control material is made of 40%wt lignite, 14%wt anhydrous sodium sulfite, 6%wt sodium metabisulfite, 15%wt sodium hydroxide, 4%wt formaldehyde, 6%wt A condensate formed by reacting sodium carbonate and 15%wt chloroacetic acid at 100°C for 4-6 hours. Its condensate contains sulfonate group and carboxymethyl group.

[0040] The performance index of the shielding temporary plugging agent for drilling fluid after testing is:

[0041] 1. Appearance: gray free-flowing powder 2. Moisture %: 8.1

[0042] 3. Fineness: 0.76mm 4. Sieve residual %: 8.3%

[0043] 5. API filtration loss (ml): 3.3 6. Plugging speed (seconds): 14.3

[0044] 7. Closed fluid loss (ml): 28 8. PH value: 7.9

[0045] 9. Apparent viscosity (mpa.s): 8.1

[0046] 10...

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Abstract

The invention discloses a shield diverting agent for drilling fluid. The shield diverting agent is composed of 30-70wt% of middle molecular binding material and 30-70wt% of filtration quality reducing material; wherein the middle molecular binding material is nanmu derivative, and the filtration quality reducing material is the condensation compound formed by the reaction of 40-60wt% of lignite, 5-20wt% of anhydrous sodium sulphite, 5-20wt% of sodium metabisulfite, 5-20wt% of sodium hydroxide, 2-8wt% of formaldehyde, 2-8wt% of sodium carbonate and 5-20wt% of chloroacetic acid. The invention is nontoxic and harmless, has fluorescence anti-interference and lubricity without foaming, strong anti-pressure capability of membrane chained by dense phase and good diaphragm transitivity, has deformability, plasticity and pressure buffer action, and can effectively block stratums of different penetrability as well as relatively large crack, cranny and medium and small cavern during drilling, thus preventing lost circulation and reducing formation damage; furthermore, the use cost is lower, the material is saved, and the confecting process is simplified, thus improving the drilling efficiency, being suitable for drilling of deep wells and large-diameter wells and being applied to drilling in seawater and salt water.

Description

technical field [0001] The invention relates to a plugging temporary plugging agent for drilling fluid used in petroleum and natural gas drilling and development projects. Background technique [0002] In recent years, with the expansion of oil and gas exploration and development areas, the strata to be exploited are getting deeper and deeper, and the stratum conditions are becoming more and more complex, making mining more and more difficult. Therefore, effective measures must be taken in the drilling and development process to ensure the smooth progress of drilling operations, especially for the complex problem of oil and gas production - lost circulation, which is a technical problem that cannot wait to be solved today. Because in the drilling, killing, cementing and testing operations, once lost circulation occurs, not only the drilling time will be delayed, but also accidents such as well collapse, pipe sticking and blowout may occur, and even lead to major accidents su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/42
Inventor 陈清安陈胜国
Owner 陈清安
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