Low solid phase and micro-foam drilling fluid or completion fluid capable of being used circularly

A low-solids and drilling fluid technology, applied in the field of drilling fluid and completion fluid, can solve problems such as system instability, blockage of gas and gas layer channels, poor foam stability, etc., and achieve a wide range of density adjustment and good protection of storage layer, good lubricity effect

Active Publication Date: 2010-02-10
DONGYING TAIER GASOLINE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages or deficiencies of this technology are: ①The content of bentonite is high, and the bentonite slurry needs to be pre-hydrated. The preparation process is long and the preparation procedure is complicated; Unstable, poor foam stability, difficult to control the density

Method used

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Examples

Experimental program
Comparison scheme
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Example Embodiment

[0020] A kind of low-solid microfoam drilling or well completion fluid, its composition and content, content is weight part:

[0021] ①Microfoam low solid phase composite treatment agent SD-LGA 3-4;

[0022] ② Low density and low solid phase tackifier SD-LGV 0.5-1;

[0023] ③Low density modifier SD-LFD 0.5-1;

[0024] ④ Low density foam stabilizer SD-LFS 0.5-1;

[0025] ⑤ Low-density flow regulator SD-LFR 0.5-1;

[0026] ⑥ clear water 100.

[0027] Wherein, described ① micro-foam low-solid composite treatment agent SD-LGA is bentonite: Na 2 CO 3 : CMC-MV = 1-3: 0.2-0.3: 0.3-1 ratio phase combination; ② low density and low solid phase tackifier SD-LGV is based on CMC-HV: XC: HEC = 0.5-2: 0.1-0.3 : the ratio of 0.5-2; ③The low-density regulator SD-LFD is combined in the ratio of AS:ABS:polymer alcohol:F873=1-4:2-4:6-10:6-10; ④Low The density foam stabilizer SD-LFS is combined in the ratio of DFD-140:CMC-LV:PAC-HV=3-8:6-10:3-8. ⑤ Low-density flow regulator SD-LFR is a com...

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Abstract

The invention discloses a low solid phase and micro-foam drilling fluid or completion fluid capable of being used circularly, comprising the following components in portions by weight: 3-4 portions ofmicro-foam and low-solid phase composite treating agent SD-LGA capable of being used circularly, 0.5-1 portion of low-density and low-solid phase tackifier SD-LGV, 0.5-1 portion of low-density regulator SD-LFD, 0.5-1 portion of low-density foam stabilizer SD-LFS, 0.5-1 portion of low-density flowing type regulator SD-LFR and 100 portions of clear water. The preparation method comprises the following steps: sequentially adding the components into the clear water in a conventional preparation method according to the weight content of each component at normal temperature and normal pressure, andthen, uniformly mixing and stirring the components for use. The drilling fluid or completion fluid has the advantages of low solid phase, low density, high foam stability, high structural strength, high fluid phase viscosity, high flexibility, high lubricity, very low toxicity, easy biodegradation, circular use, little influence on environment, little harm to a storage layer, high permeability recovery value, good effect on protection of an oil-gas layer and the like, and is widely applied to a drilling engineering technology of petroleum and geology.

Description

1. Technical field [0001] The invention relates to a drilling fluid and a well completion fluid, in particular to a recyclable low solid phase microfoam drilling fluid or well completion fluid. 2. Background technology [0002] In oil and gas exploration in low pressure, low permeability and depleted formations, recyclable microfoam drilling fluid technology is often used. Chinese Patent No. 20041001323.7 titled "Application and Preparation Method of Surplus Activated Sludge Protein as Foam Drilling Fluid" discloses a kind of microfoam drilling fluid, its formula and content are, parts by weight: bentonite 5, tackifier 0.1 , Stabilizer 0.2, Foaming Agent 0.5; Viscosifier is hydroxymethyl cellulose; Stabilizer is polyacrylamide. The disadvantages or deficiencies of this technology are: ① the content of bentonite is high, and the bentonite slurry needs to be pre-hydrated, and the preparation is long and complicated; Unstable, poor foam stability, difficult to control the den...

Claims

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Application Information

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IPC IPC(8): C09K8/38
CPCC09K8/38
Inventor 隋跃华关芳成效华张帅崔亘宇杨常胜王莉莉郭广木隋彩云于学强陶开龙
Owner DONGYING TAIER GASOLINE TECH
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