Anti-collapse circulative micro-foam drilling fluid or well completion fluid

A drilling fluid and completion fluid technology, applied in the field of completion fluid and drilling, can solve the problems of aggravating downhole complexity, easy collapse of wellbore, and high cost of use, reducing downhole complexity, wide adjustable range of density, and improving drilling. effect of speed

Active Publication Date: 2008-05-21
DONGYING TAIER GASOLINE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The existing foam drilling fluid technology used in oil drilling has (1) Chinese Patent No. 200410021014.8 titled "A Microfoam Foaming Agent and Its Drilling Fluid System Formula", the formula is: 5% base slurry+0.3% MF +0.03%SF+2%SMP-II+0.05%80A-51+0.2%XC+1%SPNH, its shortcoming or shortcoming is that it can only be used in conventional hard formations, and hydration expansion is very easy to occur in mudstone formations, blocking steam layer pores, causing great damage to the reservoir; foam stability is poor, can not improve the anti-collapse ability of drilling fluid; (2) Chinese Patent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0023] An anti-collapse circulating micro-foam drilling fluid or well completion fluid, which consists of parts by weight:

[0024] (A) base slurry: bentonite 2-4.5 or 6-10 soda ash 0.2-0.3 water 100

[0025] (B) Additives: ①Anti-slump agent SD-FT 2-5

[0026] ②Binder SD-JF 1-3

[0027] ③Tackifier SD-XHV 0.5-3

[0028] ④Fluid loss control agent SMP-II 1-3

[0029] ⑤Foaming agent SD-FP 2-5

[0030] ⑥Foam stabilizer SD-T 0.5-2.5

[0031] ⑦Flow regulator SD-D 0.5-2.5

[0032] Using conventional preparation methods, prepare (A) first, and then add (B) to (A) in turn.

[0033] Concrete preparation example (weight part)

[0034] first case

[0035] (A) Base slurry: bentonite 4.5 soda ash 0.2 water 100

[0036] (B) Additives:

[0037] ① The anti-slump agent SD-FT is 2 parts of fluorescent white asphalt;

[0038] ② 1 part of cementing agent SD-JF;

[0039] ③ Viscosifier SD-XHV 0.5 parts, combined by the ratio of CMC-HV (high viscosity sodium carboxymethyl cellulose): XC (b...

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PUM

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Abstract

The invention discloses an anti-collapse circulating microfoam drilling fluid or completion fluid, which consists of (A) base slurry: bentonite 2-4.5 or 6-10, soda ash 0.2-0.3 water 100 parts by weight. (B) Additives: ① Anti-slump agent 2-5, ② Cementing agent 3-5, ③ Viscosifier 0.5-3, ④ Fluid loss reducer 1-3, ⑤ Foaming agent 0.5-5, foam stabilizer 0.5- 2.5, flow regulator 0.5-2.5. The invention has strong anti-slump function and strong adaptability, can be used as both drilling fluid and completion fluid, can be applied to low-pressure carbonate formations, and low-pressure, low-permeability mudstone formations and rock formations It is mainly used in drilling and completion of low-pressure, low-permeability and easy-collapse formations.

Description

1. Technical field [0001] The invention relates to drilling and well completion fluids, in particular to an anti-collapse circulating microfoam drilling fluid or well completion fluid. 2. Background technology [0002] The existing foam drilling fluid technology used in oil drilling has (1) Chinese Patent No. 200410021014.8 titled "A Microfoam Foaming Agent and Its Drilling Fluid System Formula", the formula is: 5% base slurry+0.3% MF +0.03%SF+2%SMP-II+0.05%80A-51+0.2%XC+1%SPNH, its shortcoming or shortcoming is that it can only be used in conventional hard formations, and hydration expansion is very easy to occur in mudstone formations, blocking steam layer pores, causing great damage to the reservoir; foam stability is poor, can not improve the anti-collapse ability of drilling fluid; (2) Chinese Patent No. 20041001323.7 is titled "Application and Preparation Method of Residual Activated Sludge Protein as Foam Drilling Fluid" ", the formula of this method is parts by weig...

Claims

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Application Information

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IPC IPC(8): C09K8/05
Inventor 隋跃华关芳李金发成效华吴长勇关山李章启张庆波
Owner DONGYING TAIER GASOLINE TECH
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