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Salt-containing separating liquid system and its prepn process

A spacer fluid and system technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of poor rheological adjustment and control ability, narrow range of spacer fluid density, single performance and use, etc., and achieve strong weighting ability , solve the effects of cementing quality decline and wide density adjustment range

Inactive Publication Date: 2007-12-19
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The purpose of the present invention is: in order to overcome that the fresh water spacer fluid is easy to cause complex situations in the salt-gypsum layer downhole, through the isolation, buffering and scouring functions of the salt-containing spacer fluid, the harmful retention on the well wall and the casing wall can be removed, and the cement can be effectively improved. The displacement efficiency of slurry can improve the cementing quality of oil and gas wells in salt-bearing gypsum layers, and solve the problems of narrow density range, single performance and application, poor rheological adjustment and control ability, and poor field adaptability of the existing spacer fluid. Salt-containing spacer fluid system and preparation method

Method used

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  • Salt-containing separating liquid system and its prepn process

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Embodiment 1

[0029] Embodiment 1. The salt-containing spacer fluid of the present invention is formulated into an undersaturated brine spacer system with 15% NaCl, and undersaturated brine spacer 1#-9# are prepared, and the basic performance in the room is measured. Take 100% clear water, first put in 4% modified bentonite and 0.24% Na 2 CO 3Stir for 2 hours, then prefabricated and hydrated for 24 hours; in the prefabricated clay base slurry, add 0.05 (0.05, 0.1, 0.2, 0.15, 0.15, 0.1, 0.15, 0.1)% tackifier, 0.2 (0.25, 0.25, 0.2, 0.2, 0.15, 0.15, 0.1, 0.1)% fluid loss reducer, 15% NaCl, 0.1 (0.3, 0.5, 0.5, 0.8, 0.8, 1.0, 1.2, 1.2)% flow regulator , each treatment agent is stirred evenly and then another is added; in the base liquid prepared above, add 33 (66.7, 100, 150, 200, 233, 266, 300, 333)% by weight under the condition of low-speed stirring The spar should be added slowly, and then stirred for 30 minutes after the addition, and the preparation of the 9 kinds of spacers is completed...

Embodiment 2

[0031] Example 2. The salt-containing spacer fluid of the present invention was prepared into a saturated brine spacer system with 35% NaCl, and saturated brine spacer 1#-9# were prepared, and the basic performance of the room was measured. Take 100% clear water, first put in 5% modified bentonite and 0.3% Na 2 CO 3 Stir for 2 hours, then prefabricated and hydrated for 24 hours; in the prefabricated clay base slurry, add 0.1 (0.1, 0.15, 0.15, 0.2, 0.2, 0.15, 0.15, 0.1)% tackifier, 0.2 (0.25, 0.25, 0.2, 0.2, 0.2, 0.15, 0.15, 0.15)% fluid loss reducer, 35% NaCl, 0.3 (0.5, 0.5, 0.8, 0.8, 1.0, 1.2, 1.4, 1.4)% flow regulator , each treatment agent is stirred evenly and then another is added; in the base liquid prepared above, add 33 (66.7, 100, 150, 200, 233, 266, 300, 333)% by weight under the condition of low-speed stirring The spar should be added slowly, and then stirred for 30 minutes after the addition, and the preparation of the 9 kinds of spacers is completed.

[0032] I...

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Abstract

The present invention is salt-containing separating liquid system for cementing shaft wall and its preparation process. It is prepared with water 100 weight portions, clay mineral 1-5 weight portions, tackifier 0.05-0.25 weight portion, dehydration reducing agent 0.1-0.3 weight portion, flow form regulator 0.1-1.5 weight portions, weight additive 30-333 weight portions, NaCl 1-35 weight portions, Na2CO3 0.06-0.3 weight portion and defoaming agent in small amount. It is prepared through mixing all the said materials. It has relatively capacity of resisting pollution of soluble salts, wide density regulating range, flexible rheological property regulating capacity and high fluid chemical compatibility.

Description

technical field [0001] The invention relates to a salt-containing spacer fluid system used in the technical field of petroleum drilling engineering well cementing and a preparation method thereof. Background technique [0002] With the increase of the world's energy demand and the development of oil drilling technology, drilling into deep wells, ultra-deep wells and complex oil and gas layers has become inevitable. Salt-gypsum layers have been drilled in my country's Tarim, Jianghan, Sichuan, Shengli, North China, Central Plains, Xinjiang, Qinghai, Changqing and other oil fields. Salt-gypsum layer is mainly composed of rock salt (NaCl) and gypsum (CaSO 4 or CaSO 4 .2H 2 O) Formation composed of. Due to the complexity and harshness of the salt-gypsum layer, 10% to 20% of my country's current oil resources are buried under the salt-gypsum layer deep in the formation, which is difficult to exploit. In most domestic oil fields with salt-gypsum layers, there have been report...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/40
Inventor 李静郭小阳李早元杨香艳
Owner SOUTHWEST PETROLEUM UNIV
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