Water-soluble organic salt weighting agent for drilling fluid for oilfields as well as preparation method and application thereof

Abstract

The invention provides a water-soluble organic salt weighting agent for drilling fluid for oilfields as well as a preparation method and application thereof. The method comprises the steps of preparing an organic acid mixture containing bromine atoms, wherein the organic acid mixture comprises C1-C6 organic acids; adding composite alkali containing NaOH, KOH, ammonia water, N(CH3)3 and epoxy chloropropane to the organic acid mixture, stirring the materials to react, and evaporating water until the product is pasty or half-dry, wherein the mass ratio of composite alkali to organic acids is (0.15-1.5):1; drying the product at 80-120 DEG C for 6-24 hours, and grinding the dried product, thus obtaining the granular product. The weighting agent can not only improve the density of solid-free water-based drilling fluid base fluid but also improve the inhibitive capacity of the drilling fluid.

Description

technical field [0001] The invention relates to a water-soluble organic salt weighting agent for oilfield drilling fluid and its preparation method and application, in particular to a water-soluble organic salt weighting agent containing carbon 1-carbon 6 organic acid salts and used for oil drilling and well completion Weigh4, and the preparation method of this weighting agent and its related application. Background technique [0002] In the process of drilling on-site operations, especially in high-pressure or ultra-high-pressure on-site drilling operations, it is necessary to increase the density of the drilling fluid, so it is necessary to add inert weighting materials (ie weighting agents). The main components of traditional weighting materials are barite, iron Ore powder, galena powder, calcium phosphate ore powder, etc. For related documents, please refer to CN1539911A, CN1075544A, etc. However, the addition of these traditional weighting materials will greatly increa...

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Problems solved by technology

The inventor of this case has proposed the organic acid salt weighting agent of the band heteroatom substituent that improves on the formate basis in the previous research, see " research and application of organic salt drilling fluid " (people such as Yao Shaoquan, " oil drilling Technology", the 29th volume No. 5, October, 2001), it mentioned three kinds of weighting agents, and disclosed that the chemical general formula of three kinds of weighting agents is (X m RCOO) n m n , X is a heteroatom, RCOO is a carboxyl group, M is K + 、Na + , NH 4 + , NH x R + 4-x The inventor of this case has further improved the organic acid salt weighting agent of this band heteroatom substituent in later research, referring to "organic salt drilling fluid technology" (people such as Yao Shaoquan, "Western Exploration Project", 2003 No. 7), in which the chemical formula of the two organic salt weighting agents proposed is X m R n (COO) 1 m q , where X is a heteroatom and a heteroatom group, R is C 0 -C 10 saturated hydrocarbon group, COO is a carboxyl group, and M is a monovalent cation; but the specific components of each weighting agent are not disclosed in the above-mentioned documents, nor are their respective preparation methods mentioned

In addition, recent literature has reported an organic salt weighting agent, which is a compound of low-carbon alkali metal organic acid salt, organic acid ammonium, and organic acid quaternary ammonium (see CN102212345A, CN102212346A, CN102212347A), and its general molecular formula is X m R n (COO) 1 M, in the formula, M is a monovalent metal cation or ammonium ion, X is a heteroatom or group, R is a hydrocarbon group, n+1=1-6, m≤6; this document does not provide the specific composition of the weighting agent, also No mention of its preparation method

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