Pressure-bearing plugging slurry as well as preparation method and application thereof

A technology of plugging slurry and plugging agent, applied in chemical instruments and methods, earthwork drilling, wellbore/well components, etc., can solve problems such as poor resistance to drilling fluid erosion and pressure shock, and improve the success rate and impact resistance, reduced permeability, reduced time and cost

Pending Publication Date: 2021-12-10
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The positive plugging effect is better, but the ability to resist drilling fluid erosion and pressure shock is poor

Method used

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  • Pressure-bearing plugging slurry as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The dosage of each component of the pressure-bearing leakage plugging slurry is as follows in parts by weight:

[0048] Well mud: 100

[0049] High strength plugging agent GQJ-1: 12

[0050] Elastic plugging agent SMGQ-3:6

[0051] Fiber plugging agent SQD-98: 3

[0052] Asphalt powder for drilling fluid FF-1:2

[0053] Micro-nano plugging agent SMNR-1:2

[0054] Film-forming plugging agent SMFP-1:1

[0055] in,

[0056] The well mud is potassium amine-based polysulfide drilling fluid, and the specific system formula is: 3% bentonite slurry + 2% sulfonated phenolic resin SMP-2 + 2% lignite resin SPNH + 3% sulfonated lignite SMC + 2% sulfonated Asphalt powder FT-1+2% cationic emulsified asphalt YK-H+2% nanoemulsion RHJ-3+1% polyamine SMJA-1+5% potassium chloride KCl+barite, drilling fluid density is 1.38g / cm 3 , the viscosity is 50s.

[0057] The preparation method of the pressure-bearing plugging slurry comprises the following steps:

[0058] Take the well mud,...

Embodiment 2

[0062] The dosage of each component of the pressure-bearing leakage plugging slurry is as follows in parts by weight:

[0063] Well mud: 100

[0064] High strength plugging agent GQJ-2: 10

[0065] Elastic plugging agent SMGQ-3:5

[0066] Fiber plugging agent DF-1: 2.5

[0067] Asphalt powder for drilling fluid FT-342: 2.5

[0068] Micro-nano plugging agent SMNR-1:3

[0069] Film-forming plugging agent SMFP-1: 1.5

[0070] The preparation method of the pressure-bearing plugging slurry is the same as in Example 1.

[0071] The well mud is potassium amine polysulfonate drilling fluid, and its specific system formula includes: 3% bentonite mud + 2% SMP-2 + 2% SPNH + 3% SMC + 2% FT-1 + 2% YK-H + 2%RHJ-3+1%SMJA-1+5%K Cl+barite, drilling fluid density is 1.38g / cm 3 , The viscosity is 54s.

[0072] Leakage occurred at 6016m at the bottom of the well, with a leakage rate of 12m 3 / h, prepare 50m according to the above formula 3 Pressure-bearing plugging slurry, and use the d...

Embodiment 3

[0075] The dosage of each component of the pressure-bearing leakage plugging slurry is as follows in parts by weight:

[0076] Well mud: 100

[0077] High strength plugging agent GQJ-2: 16

[0078] Elastic plugging agent SMGQ-3: 8

[0079] Fiber plugging agent DF-1:4

[0080] Asphalt powder for drilling fluid FT-1:4

[0081] Micro-nano plugging agent SMNR-1:3

[0082] Film-forming plugging agent SMFP-1:2

[0083] The preparation method of the pressure-bearing plugging slurry is the same as in Example 1.

[0084] The well mud is potassium amine polysulfonate drilling fluid, and its specific system formula includes:

[0085] 3% bentonite slurry + 2% SMP-2 + 2% SPNH + 3% SMC + 2% FT-1 + 2% YK-H + 2% RHJ-3

[0086] +1%SMJA-1+5%KCl+barite, drilling fluid density is 1.38g / cm 3 , The viscosity is 53s.

[0087] The leakage occurred at 6558m at the bottom of the well, and the leakage rate was 32m 3 / h, prepare 60m according to the above formula 3 Pressure-bearing plugging sl...

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Abstract

The invention relates to pressure-bearing leaking stoppage slurry and a preparation method and application thereof in the field of petroleum drilling leaking stoppage. According to the pressure-bearing plugging slurry, on the basis of an optimized bridge plugging formula, the bridge plugging slurry formula is strengthened, and a micro-nano plugging agent and a film-forming plugging agent are introduced, so that the permeability of a formed plugging bridge plug is further reduced, crack propagation is prevented, and the pressure-bearing capacity of a stratum is improved. After the bridge plugging slurry is injected, an annulus is closed, proper squeezing is carried out at small displacement to open low-pressure stratum cracks, the plugging slurry is stacked in a leakage layer for bridging filling, part of materials are wound, gathered and cross-linked to form a film to form a compact plugging isolation layer, a leakage channel is firmly plugged, the pressure bearing strength is high, the effect can be achieved for a long time, and and the time and the cost of well drilling plugging operation can be greatly reduced.

Description

technical field [0001] The invention relates to the field of oil drilling plugging, and more specifically relates to a pressure-bearing plugging slurry and its preparation method and application. Background technique [0002] Lost circulation is a common and complicated problem in drilling operations. It causes drilling fluid to leak from the wellbore into the lost channel, which not only consumes a lot of drilling fluid and plugging materials, but also may cause serious and complicated accidents such as well couch, drill stuck, blowout, etc., and even Cause major accidents such as borehole scrapping, and huge economic losses. The main method to deal with lost circulation is to use appropriate drilling materials and technology. The current plugging materials are mainly divided into bridge plugging materials, cement consolidation materials, polymer gel materials, fiber materials, foam materials and so on. [0003] In recent years, a variety of solutions have been proposed f...

Claims

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Application Information

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IPC IPC(8): C09K8/42E21B33/13
CPCC09K8/426E21B33/13C09K2208/08C09K2208/10
Inventor 宋碧涛刘金华张凤英李大奇李凡高书阳陈曾伟陈晓飞
Owner CHINA PETROLEUM & CHEM CORP
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