Deep well polysulfonate drilling fluid and preparation method thereof

A technology of polysulfonic acid drilling and deep well, which is applied in the field of deep well drilling fluid, can solve the problems of difficult control of HTHP wall-building and rheology, high preparation cost and maintenance cost, and large amount of addition, and achieves fewer types and total dosage. Reduced, high-performance effects

Active Publication Date: 2017-10-13
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to aim at high-temperature and high-density brine drilling fluids commonly used in my country. There are too many types of treatment agents, and the dosage is too large. After the drilling fluid is aged, it is difficult to control the wall-building and rheological properties of HTHP, and the preparation cost and maintenance cost are high. In order to solve the problem, a deep well sulfonated drilling fluid and its preparation method are provided. The deep well sulfonated drilling fluid solves the problems of high viscosity of high-density drilling fluid, large HTHP water loss, and difficult to control

Method used

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Examples

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preparation example Construction

[0055] According to the present invention, the synthetic method of described acrylamide / dimethyl diallyl ammonium chloride binary copolymer comprises the following steps:

[0056] (1) AM, DMDAAC and deionized water are mixed;

[0057] (2) the mixture that step (1) obtains is mixed with initiator;

[0058] (3) The product obtained in step (2) is extracted with ethanol, shredded and filtered, and then dried in a vacuum oven.

[0059] Wherein, in step (1), the mixing conditions can be as follows: the temperature is 49-51°C, the stirring rate is not specifically limited, it can be a routine choice of those skilled in the art, for example, the stirring rate can be 280-320 rpm / minute, and while stirring the solution, carry out nitrogen and oxygen removal treatment, the time can be 19-21 minutes;

[0060] Wherein, in step (2), the initiator may be a redox system, such as 2,2' azabis(2-imidazoline) dihydrochloride (VA-044), 2,2'- One or more of azobisisobutylamidine dihydrochlori...

Embodiment approach

[0110] According to a preferred embodiment of the present invention, the preparation method of this deep well polysulfide drilling fluid comprises the following steps:

[0111] (1) First, stir bentonite and water for 5-15 minutes at a temperature of 50-70°C under a stirring condition of 550-650r / min; then, mix the mixture of bentonite and water with sodium carbonate and mix it at 50°C Stir at -70°C for 25-35 minutes under the stirring condition of 550-650r / min; then, perform prehydration treatment to obtain the prehydrated soil slurry, wherein the conditions of the prehydration treatment include: the temperature can be 50-70°C, the time can be 23-25 ​​hours; preferably, the temperature is 55-65°C, and the time is 23.5-24.5 hours;

[0112] (2) Heat the pre-hydrated soil slurry to 60-70°C, mix the heated pre-hydrated soil slurry with fluid loss control agent and sodium polyacrylate and stir at 950-1000r / min Stir for 50-70 minutes; then, mix the mixture with sodium chloride, pot...

preparation example 1

[0123] This preparation example is used to illustrate the synthesis of the acrylamide / dimethyldiallylammonium chloride binary copolymer (AM / DMDAAC).

[0124] (1) Put a magnetic stirrer in the three-necked flask, insert a thermometer, place it in a constant temperature water bath and stir continuously, set the water temperature to 50°C, and the stirring rate to 300 rpm;

[0125] (2) Weigh 20 grams of AM monomer, dissolve it with deionized water and add it to a three-necked flask, then weigh 20 grams of DMDAAC solution and add it to a three-necked flask, then, while stirring the solution, carry out nitrogen and oxygen removal treatment, pass The time for nitrogen deoxygenation treatment is 20 minutes;

[0126] (3) Taking the total mass of AM and DMDAAC monomers as the base, weigh 0.048 grams of initiator (the initiator is ammonium persulfate-sodium bisulfite), prepare an aqueous solution with deionized water, and add it dropwise to three mouthfuls after deoxygenation ends. Flas...

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Abstract

The invention relates to the field of deep well drilling fluid and discloses deep well polysulfonate drilling fluid and a preparation method thereof. The deep well polysulfonate drilling fluid is prepared from the following components in parts by weight: 100 parts of water as a datum, 3.5-5 parts of bentonite, 0.15-0.35 part of sodium carbonate, 6-8 parts of sulfomethylated phenol formaldehyde resin, 6-8 parts of sulfonated brown coal, 7.5-12 parts of halide salt, 0.5-1.2 parts of filtrate reducer, 0.8-1.7 parts of sodium polyacrylate, 3-5 parts of sodium bisulfite and 250-300 parts of barite. The deep well polysulfonate drilling fluid has excellent performance of low viscosity, low HTHP (High Temperature and High Pressure) water loss and the like.

Description

technical field [0001] The invention relates to the field of deep well drilling fluids, in particular to a deep well sulfonated drilling fluid and a preparation method thereof, which is particularly suitable for drilling deep wells and ultra-deep wells. Background technique [0002] In recent years, with the increase in the number of special wells, ultra-deep wells and complex wells, the drilling of deep and ultra-deep wells has been regarded as an important aspect of the future development of the drilling industry at home and abroad. Higher requirements are put forward for drilling fluid technology, and the original drilling fluid treatment agent can no longer fully meet the needs of the development of drilling fluid technology. Because the deeper the well, the more technical difficulties, therefore, all countries in the world regard the drilling depth and speed as an important symbol of the drilling process. Practice has proved that the quality of drilling fluid for deep ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/14C09K8/16
CPCC09K8/14C09K8/16
Inventor 白杨罗平亚林凌梁大川
Owner SOUTHWEST PETROLEUM UNIV
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