Oil layer protective agent for drilling fluid and production method thereof
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A technology for oil layer protection and drilling fluid, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of incompatibility between working fluid fluid and formation fluid, high preparation cost of oil layer protection agent, poor compatibility of oil and gas layer rocks, etc. , to achieve the effect of low preparation cost, easy promotion and reduction of free water
Active Publication Date: 2016-07-06
BEIJING BAOWO PETROLEUM TECH
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Problems solved by technology
[0004] The invention proposes an oil layer protective agent for drilling fluid and its production method, which solves the problem of the high preparation cost of the oil layer protective agent in the prior art, the high requirements for on-site application of solid control equipment, the incompatibility of the working fluid fluid with the formation fluid, and the incompatibility with the formation fluid. Due to the poor compatibility of oil and gas reservoir rocks and other conditions of use, it cannot be widely used
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Embodiment 1
[0039] The oil layer protective agent for drilling fluid of the present invention comprises the following components by weight percentage:
[0040] Industrial water 27%, carboxymethyl cellulose 1.5%, white oil 60%, ammonium salt 5%, fine calcium carbonate 5%, defoamer 1.5%.
Embodiment 2
[0042] The oil layer protective agent for drilling fluid of the present invention comprises the following components by weight percentage:
[0043] Industrial water 35%, carboxymethyl cellulose 1%, white oil 53%, ammonium salt 5%, fine calcium carbonate 5%, defoamer 1%.
Embodiment 3
[0045] The oil layer protective agent for drilling fluid of the present invention comprises the following components by weight percentage:
[0046] Industrial water 27%, carboxymethyl cellulose 1.5%, white oil 50%, ammonium salt 10%, fine calcium carbonate 10%, defoamer 1.5%.
[0047] Such as figure 1 Shown, the present invention also provides a kind of method for producing above-mentioned oil layer protection agent for drilling fluid, comprises the steps:
[0048] 1. According to the weight percentage, add carboxymethyl cellulose to the industrial water and stir at a high speed until the carboxymethyl cellulose is uniformly dissolved to obtain a carboxymethyl cellulose solution for subsequent use;
[0049] 2. Add ammonium salt and fine-grained calcium carbonate to the white oil in sequence according to the weight percentage, and stir to obtain the white oil mixture for later use;
[0050] 3. Add the white oil mixture to the carboxymethyl cellulose solution, and then add a d...
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Abstract
The invention provides an oil layer protective agent for drilling fluid and a production method thereof, which is used for solving the problems of high requirement on solid control equipment in site because of high configuration cost, incompatibility of working fluid and formation fluid and narrow use because of the constraint of service conditions such as poor rock incompatibility of oil and gas layers in the oil layer protective agent in the prior art. The oil layer protective agent for drilling fluid is prepared from the following components in percentage by weight: 27-35% of industrial water, 1-1.5% of carboxymethylcellulose, 53-60% of white oil, 5-10% of ammonium salt, 5-10% of fine calcium carbonate and 1-1.5% of defoamer. The oil layer protective agent for drilling fluid disclosed by the invention takes subsidiary function in reducing water loss so as to further reduce free water permeate into the stratum without influencing the performance of the drilling fluid; the matching degree of the particle size of the oil layer protective agent can be maximized according to the pore throat characteristics of different stratum oil and gas layers so as to effectively realize plugging; the proper oil-phase proportion can more effectively avoid the damage to oil and gas layers; the preparation cost is low.
Description
technical field [0001] The invention relates to the technical field of petroleum exploitation, in particular to an oil layer protective agent for drilling fluid and a production method thereof. Background technique [0002] In petroleum drilling engineering, drilling fluid is essential. It can carry and suspend cuttings, stabilize well wall and balance formation pressure, cool and lubricate drill bits and drilling tools, and transmit hydrodynamic force. The performance of drilling fluid is determined Good or bad directly affects the wellbore quality and drilling speed of drilling. Therefore, it is necessary to add a variety of treatment agents to the drilling fluid to improve and stabilize the performance of the drilling fluid, and to adjust and maintain the drilling fluid at any time so that the performance of the drilling fluid meets the requirements of the formation and drilling technology. Oil layer protection agent is one of many treatment agents. [0003] At present,...
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