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Acid-soluble mineral fiber coarse bridge plugging agent and plugging liquid and preparation method thereof

A technology of mineral fiber and leakage plugging agent, applied in chemical instruments and methods, drilling composition and other directions, can solve the problem of time-consuming and labor-intensive, high pressure and high acid solubility, poor leakage plugging effect, bridge plugging and building blocking agent Complex preparation and other problems to achieve good effect of plugging

Active Publication Date: 2018-10-23
XINJIANG LUMING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention provides a kind of acid-soluble mineral fiber coarse bridge plugging agent and plugging liquid and its preparation method, which overcomes the above-mentioned deficiencies in the prior art , which can effectively solve the problems of complex preparation of existing bridge plugging agents, time-consuming and labor-intensive, inability to fully guarantee high temperature resistance, high pressure, high acid solubility and poor plugging effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1, the coarse bridge plugging agent in the acid-soluble mineral fiber, the raw material contains 30 to 40 parts of limestone, 20 to 35 parts of mica, 15 to 20 parts of asbestos, and 5 to 5 parts of vermiculite by weight. 15 parts, 2 to 5 parts of cotton wool, 3 to 15 parts of acidifiable fiber, 3 to 10 parts of one-way pressure sealant, 1 to 5 parts of delayed expansion agent, 0.1 to 2 parts of viscosity reducer; : The particle size of limestone is 2.5mm to 4.2mm, the particle size of mica is 2.5mm to 4.2mm, and the particle size of vermiculite is 2.0mm to 4.0mm.

Embodiment 2

[0027] Example 2, the coarse bridge plugging agent in the acid-soluble mineral fiber is obtained by the following method: the first step, the required amount of limestone, mica, asbestos, vermiculite, cotton wool, acidifiable fiber, unidirectional The pressure sealing agent, delayed expansion agent and viscosity reducer are added into the mixer for primary mixing, and after the primary mixing, a primary mixture with fibers floating on the surface is obtained; in the second step, the primary mixture is subjected to secondary mixing in the mixer. Stirring in the first stage, during the second stage of stirring, a fan is used to send a small wind into the mixer at the same time, after the second stage of stirring, the secondary mixture is obtained, and in the third step, the secondary mixture is stirred in the mixer for the third stage. During the first-stage stirring, a fan is used to send strong wind into the mixer, and after the third-stage stirring, the thick bridge plugging a...

Embodiment 3

[0029] Example 3, the coarse bridge plugging agent in the acid-soluble mineral fiber is obtained by the following preparation method: the first step, the required amount of limestone, mica, asbestos, vermiculite, cotton wool, acidifiable fiber, single Add the pressure sealing agent, delayed expansion agent and viscosity reducer to the mixer for primary mixing, and after the primary mixing, the primary mixture with fibers floating on the surface is obtained; the second step is to carry out the primary mixing in the mixer Two-stage stirring, during the second-stage stirring, a fan is used to send a small wind into the mixer at the same time, after the second-stage stirring, the secondary mixture is obtained, and the third step is to carry out the third-stage stirring of the secondary mixture in the mixer, During the three-stage stirring, a fan is used to send strong wind into the mixer at the same time, and after the three-stage stirring, the thick bridge plugging agent in the ac...

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Abstract

The invention relates to the technical field of auxiliaries for oil-gas exploration drilling in oil fields, in particular to an acid soluble mineral fiber medium-coarse bridging agent, a bridging fluid and a preparation method thereof. In raw materials of the acid soluble mineral fiber medium-coarse bridging agent, the particle size of limestone is 2.5mm-4.2mm, the particle size of mica is 2.5mm-4.2mm, and the particle size of vermiculite is 2.0mm-4.0mm. After the acid soluble mineral fiber medium-coarse bridging agent is added into plugging slurry under conditions of deep wells, ultradeep wells, high temperature, high density and high pressure, normal fluidity of drilling fluid can be kept; due to high acid solubility, when strong acid is injected for oil-gas exploitation after leakage stoppage, the acid soluble mineral fiber medium-coarse bridging agent is dissolved, so that pollution-free smooth oil-gas exploitation is guaranteed; the bridging fluid obtained by adoption of the acid soluble mineral fiber medium-coarse bridging agent is applicable to various leakage layers and excellent in leakage stopping effect.

Description

technical field [0001] The invention relates to the technical field of drilling aids for oil and gas exploration in oil fields, and relates to an acid-soluble mineral fiber mid-coarse bridge plugging agent, a plugging fluid and a preparation method thereof. Background technique [0002] The occurrence of lost circulation brings great difficulties to the exploration and development of oil and gas resources. It will not only consume drilling time and lose mud, but also may cause a series of complicated situations such as pipe sticking, blowout, and well collapse. In severe cases, the wellbore will be scrapped , resulting in significant economic losses. The damage caused by lost circulation to oil and gas exploration, drilling and development operations can be summarized as follows: 1. Lost circulation delays drilling operation time and prolongs drilling cycle; 2. Lost circulation directly causes huge material and economic losses; 3. Reservoir Loss will damage the production l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/467
CPCC09K8/467C09K2208/12
Inventor 张国发
Owner XINJIANG LUMING TECH CO LTD
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