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Packing fluid for branch well drilling

A technology of filling liquid and micelles, which is applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of easy adsorption, oil flow obstruction, oil well productivity decline, etc., achieve strong suspension ability and improve oil well productivity Effect

Active Publication Date: 2011-02-09
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Once these polymers are squeezed into the formation, they will be easily adsorbed and trapped in the pores, resulting in blocked oil flow and reduced oil well productivity
In view of the problem that the commonly used filling fluid cannot completely break the gel at the end of well completion, it is necessary to develop a filling fluid system that has no solid phase and can automatically break the gel

Method used

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  • Packing fluid for branch well drilling
  • Packing fluid for branch well drilling
  • Packing fluid for branch well drilling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1, the preparation of the filling liquid that is made up of water, micelle viscosifier and fluid loss reducer

[0020] In 300 ml of Bohai sea water, add 3 grams of N, N'-bis(hexadecyldimethyl)-1,3-dipropylene diammonium bromide and 6 grams of N, N'-bis(dodecyl Alkyl dimethyl)-1,2-ethylene diammonium bromide was stirred for 20 minutes with a speed of 10000r / min on a high stirrer to make it dissolve completely, then add 6 grams of emulsified paraffin (Hubei Hanke New Technology Co., Ltd. Co., Ltd., code-named HFL), stirred for 10 minutes to obtain a filling solution composed of water, surfactant and emulsified paraffin, wherein the mass-number ratio of water, surfactant and emulsified paraffin was 100:3:2. Among them, the surfactant is N, N'-bis(hexadecyldimethyl)-1,3-dibromide propylene diammonium salt and N,N'-bis(dodecyldimethyl)- 1,2-dibromide ethylenediammonium salt, the mass-to-number ratio is 1:2.

Embodiment 2

[0021] Embodiment 2, the preparation of the filling liquid that is made up of water, micellar viscosifier and fluid loss reducer

[0022] In 300 ml of fresh water, add 9 grams of N,N'-bis(tetradecyldimethyl)-1,3-dipropylene diammonium bromide and 3 grams of N,N'-bis(hexadecane Dimethyl)-1,3-propylene diammonium bromide was stirred for 20 minutes at a speed of 10000r / min on a high stirrer to make it completely dissolved, and then added 9 grams of 3-chloro-2-hydroxypropyl Trimethylammonium chloride etherified starch (Hubei Hanke New Technology Co., Ltd., code name HFD), stirred for 10 minutes to obtain a filling solution composed of water, surfactant and cationic starch, wherein water, surfactant and The mass-to-number ratio of the cationic starch is 100:4:3. Among them, the surfactant is N, N'-bis(tetradecyldimethyl)-1,3-dibromide propylene diammonium salt and N,N'-bis(hexadecyldimethyl)- 1,3-dibromide propylene diammonium salt, the mass-to-number ratio is 3:1.

Embodiment 3

[0023] Performance evaluation of embodiment 3, embodiment 1 and embodiment 2 filling liquid

[0024] (1) Rheology and fluid loss.

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Abstract

The invention discloses a packing fluid for branch well drilling, which comprises the following ingredients in parts by weight: 100 parts of water, 3-5 parts of micelle tackifier and 2-4 parts of fluid loss agent, wherein the micelle tackifier is a surfactant; the water is fresh water or sea water; and the fluid loss agent is one of modified starch and emulsified paraffin. By using the packing fluid, the oil well does not need to be subject to gel breakdown at the later stage of well completion, and the packing fluid can automatically finish gel breakdown when encountering formation oil during the setup of the oil well. Besides, the packing fluid causes less damage to the reservoir, realizes the maximum protection on the hydrocarbon reservoir and can increase the productivity of the oil well.

Description

technical field [0001] The invention relates to a filling fluid, in particular to a filling fluid for branch well drilling. Background technique [0002] In the past, filling fluids for drilling were usually formulated with water-soluble polymers such as hydrolyzed polyacrylamide, carboxymethyl cellulose and modified guar gum. Once these polymers are squeezed into the formation, they will be easily adsorbed and stay in the pores, resulting in the obstruction of oil flow and the decline of oil well productivity. In view of the problem that the commonly used filling fluids cannot completely break the gel in the later stage of well completion, it is necessary to develop a filling fluid system that has no solid phase and can automatically break the gel. Contents of the invention [0003] The object of the present invention is to provide a filling fluid for branch well drilling and capable of automatically breaking gel. [0004] The filling liquid of the present invention is ...

Claims

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Application Information

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IPC IPC(8): C09K8/42
Inventor 李玉光向兴金舒福昌邢希金史茂勇石磊
Owner CHINA NAT OFFSHORE OIL CORP
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