Oil-water well sand consolidation agent as well as preparation method and application thereof

A sand-fixing agent and technology for oil-water wells, applied in chemical instruments and methods, and drilling compositions, etc., can solve problems such as low rock cementation strength, inability to fix sand, and sand particles entering oil wells, so as to facilitate oil exploitation and facilitate Large-scale promotion and application, the effect of enhancing the bonding strength

Inactive Publication Date: 2018-03-09
PETROCHINA CO LTD
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  • Summary
  • Abstract
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  • Claims
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Problems solved by technology

Second, with the continuous deepening of oil well exploitation, oil reservoirs with many faults and fractures and large dip angles are severely damaged, and the rock cementation strength is low, causing sand particles to enter the oil well. At the same time, the viscosity is high and the density is high. The oil is also easy to carry more

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  • Oil-water well sand consolidation agent as well as preparation method and application thereof

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[0031] In the second aspect, the embodiment of the present invention also provides the preparation method of the above-mentioned oil-water well sand-consolidating agent, comprising the following steps: according to the weight percentage of each component in the oil-water well sand-consolidating agent, adding water, coupling agent and Carboxamide or ammonium carbonate, stir at 25°C-35°C for 25-35min, add silicate, continue stirring for 55-65min, until the solution in the reaction kettle is milky white, the oil-water well sand cementing agent is obtained.

[0032] Specifically, in order to fully hydrolyze and mix the components in the oil-water well sand cementing agent, the stirring speed during the preparation process is 30-50r / min, such as 30r / min, 35r / min, 40r / min, 45r / min , 50r / min, etc., so that the oil-water well sand-fixing agent can fully exert its sand-fixing effect after entering the oil well, and control or reduce the sand production of the oil reservoir.

[0033] Sp...

Embodiment 1

[0039] This embodiment provides a kind of oil-water well sand-consolidating agent, and this oil-water well sand-consolidating agent comprises the following components by weight percentage: aqueous solution of sodium silicate 42%, carbonamide 17.5%, coupling agent LY0.09%, The balance is water.

[0040] Wherein, and the mass fraction of sodium silicate in the aqueous solution of sodium silicate is 36%, in the aqueous solution of sodium silicate, SiO 2 with Na 2 The molar ratio of O was 3.1.

[0041] The oil-water well sand cementing agent is prepared by the following method:

[0042] According to the above dosage, add water, coupling agent LY and carbonamide to the reaction kettle, stir at 25°C for 30 minutes, add the aqueous solution of sodium silicate and ammonium bicarbonate, and continue to stir for 60 minutes until the solution in the reaction kettle is When it is milky white, the oil-water well sand cementing agent is obtained.

Embodiment 2

[0053] This embodiment provides a kind of oil-water well sand-consolidating agent, and this oil-water well sand-consolidating agent comprises the following components by weight percentage: aqueous solution of sodium silicate 42.5%, ammonium carbonate 12.5%, ammonium bicarbonate 0.55%, coupling agent LY0 .08%, balance water.

[0054] Wherein, and the mass fraction of sodium silicate in the aqueous solution of sodium silicate is 36%, SiO in sodium silicate 2 with Na 2 The molar ratio of O is 3.2.

[0055] The oil-water well sand cementing agent is prepared by the following method:

[0056] According to the above dosage, add water, coupling agent LY and ammonium carbonate to the reaction kettle, stir at 30°C for 25 minutes, add the aqueous solution of sodium silicate and ammonium bicarbonate, and continue stirring for 55 minutes until the solution in the reaction kettle is milky white , to obtain sand cementing agent for oil and water wells.

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Abstract

The invention discloses an oil-water well sand consolidation agent as well as a preparation method and application thereof, and belongs to the field of oil-water well sand consolidation. The oil-waterwell sand consolidation agent is prepared from the following components in percentage by weight 41 to 45 percent of aqueous solution of silicate, 8 to 20 percent of carbamide or ammonium carbonate, 0.06 to 0.1 percent of coupling agent and the balance of water, wherein the mass fraction of silicate in the silicate aqueous solution is 35 to 40 percent. The oil-water well sand consolidation agent covers the surfaces of sand after entering a petroleum reservoir stratum, and is combined with the carbamide or hydrogen ion generated by hydrolyzing ammonium carbonate through silicate ion generated by hydrolyzing silicate to form a polymer poly-silicate; silicon-oxygen bonds in the poly-silicate are cross-bonded to from a three-dimensional structure, so that curing layers on the surface of the sand in the petroleum reservoir stratum are cemented together for a sand production rate of the reservoir stratum; meanwhile, influence of the oil-water well sand consolidation agent on large cracks andgaps in the reservoir stratum is lowered, so that the permeation rate of the reservoir stratum and oil well yield are ensured.

Description

technical field [0001] The invention relates to the field of oil-water well sand-fixing, in particular to an oil-water well sand-fixing agent and its preparation method and application. Background technique [0002] During the development of sandstone oilfields, sand production often occurs in oil and water wells. The reasons mainly include the following two aspects: First, in the oil reservoirs of sandstone oilfields, the mineral content of sand grain cement is relatively high. With the extension of oil well production time, the reservoir The water content in the medium gradually rises, causing the clay minerals in the oil reservoir to be pumped to the ground along with the formation water or injected water, resulting in sand production in oil and water wells. Second, with the continuous deepening of oil well exploitation, oil reservoirs with many faults and fractures and large dip angles are severely damaged, and the rock cementation strength is low, causing sand particles...

Claims

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Application Information

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IPC IPC(8): C09K8/575
CPCC09K8/575
Inventor 李勇斌游靖巨登峰段丽莎余吉良王静刘莎莎崔延杰邵忠华苏焕忠
Owner PETROCHINA CO LTD
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