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A salt-resistant, high-temperature, high-strength jelly water blocking agent

A high-temperature-resistant and high-strength technology, which is applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of poor deep effective plugging ability and insufficient plugging strength of water plugging agents.

Active Publication Date: 2018-03-23
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the development and production characteristics of horizontal wells in deep high temperature, high salinity bottom water reservoirs, insufficient plugging strength of water blocking agents currently used at home and abroad, and poor deep effective plugging ability, the present invention provides a salt-resistant, high-temperature, high-pressure High-strength jelly water shutoff agent, improving the plugging ability and plugging effect of the plugging agent on the formation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0041] The preparation method of the sulfonated modified small molecule biopolymer is: adding 15% milk of lime to the pulp liquid, heating at 97°C for 45 min; allowing the calcified liquid to settle and filtering out the precipitate, and adding it after washing Concentrated sulfuric acid with a weight percentage of 50% is used for sulfonation reaction; the materials are filtered to remove calcium sulfate; the filtrate is concentrated, cooled and crystallized to prepare a sulfonated modified small molecule biopolymer.

[0042] The preparation method of the copolymer of small molecule acrylamide and sodium methacrylate sulfonate is as follows: prepare a solution with a mass concentration of 35% with a molar ratio of acrylamide and sodium methacrylate sulfonate at a molar ratio of 3:1. Treated pure water), heated to 45°C and kept stable in the reactor, purged with nitrogen content greater than 98% for 30 minutes, added 0.04% to 0.08% ammonium persulfate-sodium sulfite initiation syst...

Embodiment 1

[0044] Example 1 Preparation of gel water blocking agent sample 1#

[0045] Weigh 20g of sulfonated modified small molecule biopolymer, 2.5g of copolymer of small molecule acrylamide and sodium methacrylic sulfonate, 1.5g of phenolic resin crosslinking agent and 1g of pH adjuster, under high-speed stirring at 1000r / min , Was added to 500ml of clean water in turn, stirred for 10 minutes, prepared into a uniform solution, swelled for 60 minutes, and stirred for 10 minutes to obtain the gel water shutoff agent sample 1#.

Embodiment 2

[0046] Example 2 Preparation of gel water blocking agent sample 2#

[0047] Weigh 25g of sulfonated modified small molecule biopolymer, 4g of copolymer of small molecule acrylamide and sodium methacrylate sulfonate, 3g of phenolic resin crosslinking agent and 1.5g of pH adjuster, and under the condition of high speed stirring at 1000r / min, Sequentially add to the formation water of 500ml tower 1 (salinity 20×10 4 mg / l, the content of calcium and magnesium ions is 1×10 4 mg / l), stir for 10 minutes to prepare a uniform solution, swell for 60 minutes, and stir for another 10 minutes to obtain jelly water blocking agent sample 2#.

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PUM

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Abstract

The invention relates to an anti-salt anti-high-temperature high-intensity gel blocking agent. The gel blocking agent contains, by weight, 20-25 parts of sulfonated modified micromolecule biopolymers, 2.5-4 parts of micromolecule acrylamide and sodium methallyl sulfonate copolymers, 1.3-3 parts of cross-linking agents, and 0.5-1.5 parts of a pH regulator. The cross-linking agents are phenolic resin compounds, and are prepared from phenolic compounds and aldehyde compounds or compounds which can generate aldehydes. The sulfonated modified micromolecule biopolymers are prepared from plant extract products after sodium sulfite sulfonation. The pH regulator is one of ammonium chloride, formic acid, oxalic acid and citric acid. The gelling intensity of the gel blocking agent is 4*10<4>-10*10<4> mPa*S and the gelling time is 4-6h when the temperature is 120 DEG C and the salinity is 20*10<4>mg / l. The gel blocking agent is suitable for bottom water sandstone oil reservoir horizontal wells, the blocking rate to tahe first region Triassic natural cores is 96.4% and the acidifying removal rate is 98%.

Description

Technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to a salt-resistant, high-temperature, high-strength water shutoff agent for sandstone horizontal wells with bottom water. Background technique [0002] The Triassic clastic reservoirs in Blocks 1 and 9 of Tahe Oilfield are reservoirs with bottom water development. The buried depth of the reservoir is 4400-4700 meters, the formation temperature is 110-120℃, and the formation pressure coefficient is 1.02-1.1, which is normal temperature and pressure. System; formation water has high salinity, about 20×10 4 About mg / l, the content of calcium and magnesium ions is high, about 1×10 4 About mg / l. 1. The Triassic clastic reservoir in Block 9 is a medium-porosity and medium-permeable stratum, with a large bottom water thickness, generally greater than 50m, sufficient bottom water energy, and a small oil layer thickness, generally less than 30m. For this reason, the reservo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/512
CPCC09K8/5045C09K8/5083C09K8/5086C09K8/512
Inventor 王雷李亮张建军吴文明巫光胜钱真孙忠杰秦飞刘耀宇郭娜马淑芬伍亚军董周丹
Owner CHINA PETROLEUM & CHEM CORP