Preparation method of sulfomethyl potassium humate grafted polymer filtrate reducer for drilling liquid

A technology of graft polymer and potassium humate, which is applied in the field of preparation of potassium sulfomethyl humate graft polymer fluid loss reducer for drilling fluid, can solve the problems of large drilling fluid fluid loss, and achieve Easy to obtain, outstanding temperature and salt resistance, and strong salt resistance

Active Publication Date: 2017-11-17
民权东兴泥浆材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The temperature-resistant and salt-resistant polymer fluid loss reducer has great application potential in oilfield development. The invention develops a fluid loss reducer capable of both high temperature resistance and salt resistance, which can solve the problem of oil and gas exploitation in deep oilfields. The excessive filtration of drilling fluid during the process provides a new breakthrough for the development of high-temperature deep oil and gas

Method used

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  • Preparation method of sulfomethyl potassium humate grafted polymer filtrate reducer for drilling liquid
  • Preparation method of sulfomethyl potassium humate grafted polymer filtrate reducer for drilling liquid
  • Preparation method of sulfomethyl potassium humate grafted polymer filtrate reducer for drilling liquid

Examples

Experimental program
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Effect test

Embodiment 1

[0010] Add 100 parts of deionized water into a reactor containing 50 parts of potassium humate, stir and dissolve at room temperature, adjust the pH to 10~11 with an alkaline reagent, then add 10 parts by weight of formaldehyde, 10 parts by weight of sulfonating agent Sodium bisulfate, stir and heat up to 70~75°C, react for 3~4h and then cool down,

[0011] Dissolve 25 parts of acrylamide, 5 parts of alkacrylic acid, 10 parts of 2-acrylamido-2-methylpropanesulfonic acid, and 10 parts of N-vinylpyrrolidone in 100 parts of deionized water and add to the reaction kettle in step 1) , stirred for 0.5h, and at the same time, added 0.2 parts of initiation aid lactic acid-chromium-based bentonite material, heated up, and mixed 0.4 parts of initiator (sodium persulfate, sodium bisulfite, n sodium persulfate: n sodium sulfite = 1.3:1) into a solution, slowly and alternately add to the reaction kettle, the time of dropping is 0.5h, after the dropping is completed, keep warm at 55~60°C fo...

Embodiment 2

[0015] It is exactly the same as Example 1, the difference is: add 30 parts of potassium humate, 60 parts of deionized water, 6 parts of formaldehyde, 6 parts of sodium bisulfite; add 15 parts of acrylamide, 10 parts of alkacrylic acid, 2-propene 15 parts of amido-2-methylpropanesulfonic acid, 15 parts of N-vinylpyrrolidone were dissolved in 110 parts of deionized water, 0.17 part of initiation aid lactic acid-chromized bentonite material, and 0.34 part of initiator were added.

Embodiment 3

[0017] It is exactly the same as Example 1, except that: add 30 parts of potassium humate, 60 parts of deionized water, 6 parts of formaldehyde, 6 parts of sodium bisulfite; add 15 parts of acrylamide, 15 parts of alkacrylic acid, 2-propene 15 parts of amido-2-methylpropanesulfonic acid and 5 parts of N-vinylpyrrolidone were dissolved in 100 parts of deionized water, and 0.16 parts of initiation aid lactic acid-chromized bentonite material and 0.32 parts of initiator were added.

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Abstract

The invention discloses a preparation method of a sulfomethyl potassium humate grafted polymer filtrate reducer for drilling liquid. The preparation method comprises the following steps: preparing a high-temperature resistance filtrate reducer from the following raw materials in parts by weight according to a optimum condition: 30 to 50 parts of potassium humate, 15 to 25 parts of acrylamide, 5 to 15 parts of alkyl acrylic acid, 10 to 20 parts of 2-acrylamide-2-methylpropanesulfonic acid and 5 to 15 parts of N-vinyl-2-pyrrolidone through a water solution polymerization method. According to the invention, monomers are triggered to generate polymerization reaction to obtain a large molecule grafted polymer filtrate reducer through a redox initiator, so that a product has a good filtrate reduction property in fresh water, saturated salt water and composite brine drilling water, can resist high temperature of 200 DEG C and brings convenience to use.

Description

technical field [0001] The invention relates to the field of preparation of fluid loss reducer for drilling fluid, in particular to a preparation method of potassium sulfomethyl humate grafted polymer fluid loss reducer for drilling fluid. Background technique [0002] Excessive drilling fluid fluid loss will not only lead to the loss of drilling fluid, but also cause various problems such as wellbore instability, wellbore collapse, and reservoir pollution. Fluid loss control agent is one of the most used materials in drilling operations. Adding an appropriate amount of fluid loss control agent to drilling fluid can achieve a good fluid loss control effect. Once the anti-high temperature fluid loss reducer degrades in the drilling fluid, the temperature resistance of the drilling fluid will drop sharply, which will cause the rheology of the drilling fluid to deteriorate, flocculation and stratification of the drilling fluid, and even malignant fluid loss and mud cake thicken...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): C08F289/00C08F220/56C08F220/04C08F220/58C08F226/10C09K8/035
CPCC08F289/00C09K8/035C08F220/585
Inventor鲍荣
Owner民权东兴泥浆材料有限公司