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A solidified water temporary plugging and well killing working fluid and its preparation and drainage methods

A technology for solidifying water and working fluid, applied in the field of drilling fluid research, can solve the problems of poor reservoir protection performance and coexistence of gas well collapse and leakage, and achieve the effects of large environmental protection, reduced formation damage, and accelerated development speed.

Active Publication Date: 2020-12-01
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the problem of co-existence of collapse and leakage during gas well construction in Longdong area and poor reservoir protection performance

Method used

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  • A solidified water temporary plugging and well killing working fluid and its preparation and drainage methods
  • A solidified water temporary plugging and well killing working fluid and its preparation and drainage methods

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] In order to overcome the problems of co-existence of collapse and leakage and poor reservoir protection performance during gas well construction in Longdong area, the invention provides a solidified water temporary plugging and well killing working fluid, which includes 10-40% solidified water system and 60-90% % anti-swelling stabilizing liquid, the solidification water system is composed of the following components according to the following mass percentage: 1.1-1.5% main agent, 0.3%-0.5% curing initiator, and the balance is water.

[0031] The preparation method of the above-mentioned solidified water temporary plugging and killing working fluid comprises the following steps:

[0032] 1) Take the main agent of formula quantity;

[0033] 2) take the curing initiator and anti-swelling agent of formula quantity;

[0034] 3) Pour the formula amount of clear water into the container, add the formula amount of main agent and curing initiator in sequence, and stir evenly t...

Embodiment 2

[0038] On the basis of Example 1, a solidified water temporary plugging and killing fluid includes a solidified water system and an anti-swelling stabilizing fluid. The injection amount of the liquid accounts for 60% to 90% of the wellbore volume, and the solidified water system is composed of the following components in the following mass percentages: 1.1% to 1.5% of the main agent, 0.3% to 0.5% of the curing initiator, and the balance is water; the main agent is a polyacrylate modified water-absorbent resin grafted with hydroxyethyl cellulose, and the grafting rate of hydroxyethyl cellulose is 20-40%, and the preparation method of the modified water-absorbent resin includes the following Steps: a) Dissolve 10-15g of hydroxyethyl cellulose in 50-75ml of distilled water, add 150ml of dispersion medium and 7.5ml of dispersant while stirring; b) slowly add 150-350ml of polyacrylate neutralizing solution, 0.5 g initiator and 10-15g cross-linking agent, heat up to 65°C, and react ...

Embodiment 3

[0065] This example provides a low-damage solidified water temporary plugging and well killing working fluid. Polyacrylate-modified water-absorbing resin-20 grafted with hydroxyethyl cellulose is selected as the main agent; triethanolamine is used as the curing initiator, and high-efficiency clay Anti-swelling agent S-403 is used as an anti-swelling agent, and it is formulated into an anti-swelling stable liquid with a mass percentage of 1%. The high-efficiency clay anti-swelling agent S-403 is an existing product, purchased from Shengdu Petroleum, Dongying City Technology Co., Ltd.; take 98% of clear water into the container, add the above-mentioned 1.5% of the main agent and 0.5% of the curing initiator in turn, and stir evenly to obtain the solidified water system. The dosage of the solidified water system is 3-5m 3 , the amount of anti-swelling stabilizer is 20-40m 3 It is the temporary plugging and killing fluid for the required solidified water.

[0066] Experiments sho...

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Abstract

The invention provides solidified water temporary plugging well-killing working fluid. The solidified water temporary plugging well-killing working fluid is prepared from 10 to 40 percent of solidified water system and 60 to 90 percent of anti-swelling stabilizing fluid, wherein the solidified water system is prepared from the following components in percentage by mass: 1.1 to 1.5 percent of main agent, 0.3 to 0.5 percent of solidification initiator and the balance of water. The preparation method of the working fluid comprises the following steps: 1), taking the main agent in an amount determined in a formula; 2) taking the solidification initiator and the anti-swelling agent in amounts determined in the formula; 3) injecting clear water into a container in an amount determined in the formula, adding the main agent and the solidification agent initiator in amounts determined in the formula in sequence, and uniformly stirring to obtain the solidified water system; 4) adding the anti-swelling stabilizing fluid in an amount determined in the formula to obtain the solidified water temporary plugging well-killing working fluid. A draining method combining acidifying-demulsifying and liquid nitrogen drainage is adopted. The working fluid is simple in preparation process, a colloid protective agent is not needed, the plugging efficiency is increased greatly, the plugging cost is lowered, damage to strata is reduced, and the problems of coexistence of collapse and leakage and low reservoir protection performance in a gas well construction process are solved. The solidified water temporary plugging well-killing working fluid has important practical significance to increase of the oil gas exploration and development speeds.

Description

technical field [0001] The invention relates to the field of drilling fluid research in drilling operations in oil and gas fields, and in particular to a low-damage solidified water temporary plugging and well killing working fluid suitable for well sections of tight gas layers that are prone to collapse and its preparation and drainage methods. Background technique [0002] The buried depth of the gas field reservoir in the Longdong area is more than 4200m, which belongs to the deepest developed area in the Ordos Basin. At present, the scale of the gas field development in the Longdong area is gradually expanding, and some bottleneck problems have been exposed in the gas well construction process, which restricts the gas well drilling construction speed in this area. The main problems encountered in drilling are: [0003] 1) The burial depth of the reservoir reaches 4200-5000m, which belongs to the deepest developed area in the Ordos Basin, with high bottomhole pressure and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/508C08F291/08C08F291/06C08F222/38E21B33/13
CPCC08F251/02C08F265/02C09K8/5083C09K2208/12E21B33/13C08F222/385
Inventor 常永峰常鹏李建阳胡子见武力超夏勇辉常森
Owner PETROCHINA CO LTD
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