Oil soluble cationic broad-spectrum temporary blocking agent in use for drilling fluid

A cationic, oil-soluble technology, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of poor temporary plugging effect and difficulty in obtaining it, so as to improve the water absorption capacity of water wells, simple use process, and improve perfection degree of effect

Active Publication Date: 2007-12-26
PETROCHINA CO LTD
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the disadvantages of the conventional shielding temporary plugging technology, such as the detailed and accurate reservoir pore size data that are not easy to obtain based on the particle size selection of temporary plugging particles, and the poor temporary plugging effect when the reservoir pore size distribution is wide. To develop an oil-soluble cationic broad-spectrum temporary plugging agent for drilling fluid. When using it, it is only necessary to know the approximate range of the pore size distribution of the reservoir, and no particle size matching is required, especially for those with severe heterogeneity and wide pore size distribution. The reservoir also has a good protection effect; the excellent oil solubility of its temporary blocking particles makes the temporary blocking ring formed by it can be directly removed through the later crude oil production; while improving the protection effect of oil and gas layers, the application is simpler and more convenient

Method used

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  • Oil soluble cationic broad-spectrum temporary blocking agent in use for drilling fluid
  • Oil soluble cationic broad-spectrum temporary blocking agent in use for drilling fluid
  • Oil soluble cationic broad-spectrum temporary blocking agent in use for drilling fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Atmospheric and vacuum residual asphalt, semi-oxidized asphalt, ethylene pyrolysis tar pitch, propane deasphalt, extracted asphalt and 100 #A heavy oil asphalt raw material is heated and melted at 120-130°C in a mass ratio of 1:2:1.5:3.5:3:1.75, and 0.2% of styrene-butadiene-styrene block copolymer ( accounted for the mass ratio of the total system), and mixed uniformly to obtain oil-soluble raw materials; at the same time, the aqueous solution of emulsifier RHJ-I, RHJ-II and RHJ-III was heated to 50-60°C (the addition amount was 0.65%, 0.7% of the total system, respectively %, 0.7%), add 0.2% calcium chloride and 0.2% carboxymethyl cellulose to the emulsifier aqueous solution, continue stirring evenly and keep it between 50-60°C; add preheated Grind the modified oil-soluble material at 120-130°C and the preheated emulsifier aqueous solution (the mass ratio of oil-soluble raw material to emulsifier aqueous solution is 60:40) to prepare the oil-soluble cationic new type ...

Embodiment 2

[0040] Atmospheric and vacuum residual asphalt, semi-oxidized asphalt, ethylene pyrolysis tar pitch, propane deasphalt, extracted asphalt and 100 # A heavy oil asphalt raw material is mixed evenly at a mass ratio of 1:2.5:1.88:3.75:3.12:2, heated and melted at 120-130°C, and 0.44% of styrene-butadiene-styrene block copolymer is added (accounting for the mass ratio of the total system) to obtain oil-soluble raw materials, and simultaneously heat the aqueous solution of the emulsifiers RHJ-I, RHJ-II and RHJ-III to 50-60°C (the additions are 0.5%, 0.62%, and 0.62%), add 0.25% calcium chloride and 0.17% hydroxyethyl cellulose to the emulsifier aqueous solution, continue stirring evenly and keep between 50~60 ℃; The physical and chemical properties of the new oil-soluble cationic broad-spectrum temporary plugging agent for liquid use are shown in the table.

Embodiment 3

[0042] Atmospheric and vacuum residual asphalt, semi-oxidized asphalt, ethylene pyrolysis tar pitch, propane deasphalt, extracted asphalt and 100 # A thick oil asphalt raw material is mixed uniformly at a mass ratio of 1:1.88:1.25:3.12:2.5:1.5 to obtain an oil-soluble raw material, which is heated and melted at 120-130°C, and styrene-butadiene-styrene embedded segment copolymer 0.3% (accounting for the mass ratio of the total system), mixed evenly to obtain an oil-soluble raw material; simultaneously, the aqueous solution of the emulsifier RHJ-I, RHJ-II and RHJ-III was heated to 50~60°C (the addition amount was respectively the total 0.89%, 0.96%, 0.96% of the system), add 0.22% calcium chloride and 0.84% ​​carboxymethyl cellulose to the emulsifier aqueous solution, continue stirring evenly and keep it between 50-60°C; then follow the above The physical and chemical performance indicators of the oil-soluble cationic new broad-spectrum temporary plugging agent for drilling flui...

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Abstract

This invention relates to an oil-soluble cationic broad-spectrum temporary blocking agent for well drilling fluid. The oil-soluble cationic broad-spectrum temporary blocking agent comprises: oil-soluble materials 50-74%, SBS triblock copolymer 0.2-0.44%, epoxypropylbenzyl di(stearamide ethyl) ammonium salt 0.50-0.89%, cationic surfactant imidazoline 0.62-0.96%, dibenzyl-di(stearamide ethyl) ammonium salt 0.62-0.96%, carboxymethyl cellulose or hydroxyethyl cellulose 0.17-0.84$, CaCl2 0.2-0.25%, and water as balance. The oil-soluble materials include residue asphalt (softening point = 51-55 deg.C), semi-oxidized asphalt (softening point = 57-65 deg.C), ethylene pyrolysis coal tar pitch (softening point = 47-52 deg.C), propane-removed asphalt (softening point = 70-77 deg.C), extracted asphalt (softening point = 105-120 deg.C), and 100# heavy oil asphalt (softening point = 47-54 deg.C) at a weight ratio of 1:(1.88-2.5):(1.25-1.88):(3.12-3.75):(2.5-3.12):(1.5-2). The oil-soluble cationic broad-spectrum temporary blocking agent has such advantages as high oil solubility, high softening degree, wide softening point range, strong positive electricity, high lubricity, good fluid-loss inhibitive effect, high recovery rate of core permeability, low temporary blocking depth, high strength, good de-blocking effect, no pollution, low labor intensity, little influence on well drilling fluid construction performance, and simple process.

Description

technical field [0001] The invention relates to an oil-soluble cationic broad-spectrum temporary plugging agent for drilling fluid used in the drilling process of an oil field and used as a drilling fluid additive with an oil layer protection effect. Background technique [0002] At present, shielding and temporary plugging technology is the most commonly used oil and gas layer protection measure in the drilling process. This technology was proposed by Professor Luo Pingya of Southwest Petroleum Institute in the early 1990s, and soon it was widely promoted and applied throughout the country. Its theoretical basis is the principle of bridging. Through the bridging and filling of bridging particles, filling particles and deformable particles, a shallow "inner mud cake" with low permeability is artificially formed on the borehole wall to shield the temporary blocking ring and prevent the drilling fluid from The solid phase and filtrate in the oil invade the oil layer. The key...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/12C09K8/42
Inventor 胡成亮熊英蒋官澄宋玉文王兴伟马先平韩相勇纪朝凤季庆荣葛红江
Owner PETROCHINA CO LTD
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